Patent Application
20210162638
This disclosure relates to an integrated molded body that is suitable for use in parts or casings of equipment such as personal computers, office automation (OA) equipment, and mobile phones, that requires to be lightweight, to have high strength and high rigidity, and to be thin, and a method of manufacturing the same.
As electric/electronic devices such as personal computers, OA equipment, audio visual (AV) equipment, mobile phones, telephones, facsimiles, home appliances and toys are becoming more portable, smaller size and lighter weight are required. To achieve such requirements, because it is necessary to prevent the components that form the devices, especially casings, from significantly flexing when an external load is applied, thereby causing contact with internal components and causing destruction, it is required to achieve reduction in thickness while achieving high strength and high rigidity.
Further, in a molded structure which is made compact and lightweight by integrally joining and molding a fiber reinforced resin structure comprising reinforcing fibers and a resin, and another member such as a frame member, further reduction in thickness without warpage and reliability in joining strength are required.
In JP-A-2003-236877, a resin joint body, which comprises a first resin molded article and a second resin molded article and in which they are joined by injecting a molten resin into a joining part formed between the first resin molded article and the second resin molded article, is described, and an effect is disclosed in that by employing a structure wherein the joining part is centered about on the downstream opening of the injection flow channel, and the joining part has a portion having an angle with the molten resin injection direction in the injection flow channel and extending outward from the center of the downstream opening, the joining strength can be effectively secured with a small amount of the injection resin regardless of the joining place.
Further, in JP-A-HEI 11-179758, a synthetic resin hollow molded article obtained by forming a primary hollow molded article by integrating a plurality of divided pieces, formed by injection molding a synthetic resin, through a joining part, and fusing the joining part with a secondary molded portion formed by further injection molding a synthetic resin after placing the primary hollow molded article in a mold, is described, and an effect is disclosed in that by forming the joining part by force fitting, there is no resin leakage in the joining part toward the hollow portion side and the fracture strength of the joining part is excellent.
Further, in JP-A-2000-272014, a configuration of forming a passage in a joining part of a plurality of resin components and joining the plurality of resin components with a joining resin by charging the joining resin into the passage is described, and an effect is disclosed in that by further providing a protrusion on at least one resin component, the joining resin can be prevented from coming out of the passage, and in addition, a resin product hard to cause cracks, splits and joining defectives can be formed without deteriorating the appearance of the resin product.
Further, in JP-A-2008-34823, an integrated molded body obtained by preparing a fiber reinforced thermoplastic resin material having a thermoplastic resin adhesive layer made of a nonwoven fabric of thermoplastic resin or the like at an adhesive interface between a radio wave shielding material (a) and a radio wave transmitting material (b), and fixedly bonding the radio wave shielding material (a) and the radio wave transmitting material (b) to each other via the thermoplastic resin adhesive layer by outsert injection molding, is described, and an effect is disclosed in that an electronic device housing having excellent peeling strength at the joining part and excellent mass productivity can be obtained without deteriorating the performance of radio communication while maintaining the radio wave blocking property.
Furthermore, in JP-A-2016-49649, an integrated molded body obtained by forming at least a part of plate ends of a sandwich structure composed of a core layer made of discontinuous fibers and a thermoplastic resin (A) and a skin layer made of continuous fibers and a resin (B) as a joining part, placing another structure (C) in the joining part, and providing a joining layer at least at a part between the skin layer and the other structure (C), is described, and an effect is disclosed in that it is possible to form an integrated molded body with a thin wall, and to obtain an integrated molded body which is lightweight, has high strength and high rigidity, and has high joining strength with another structure.
JP '877 seeks to join two resin molded articles with a simple device with a small amount of injected resin, and there is room for improvement in application of that configuration to formation of a molded body joined with a plurality of members which seeks to realize reduction in thickness/weight and to suppress warpage, and further, no suggestion is made regarding the constitution for the improvement.
Further, JP '758 mainly seeks to prevent resin leakage through a gap between pieces, which may be created by increasing the molding pressure at the time of secondary injection molding, thereby causing a deformation of a fitting portion of the joining part, toward the hollow part side of the molded article, by configuring the joining part of the pieces to not come off from each other by force fitting, and there is a room for improvement in application of this configuration to formation of a molded body joined with a plurality of members which also aims to realize reduction in thickness/weight and suppress warpage and, further, no suggestion is made regarding the constitution for the improvement.
Further, JP '014 mainly seeks to prevent causing of cracks, splits and joining defectives and further to prevent joining resin from coming out, and there is a room for improvement in application of this configuration to formation of a molded body joined with a plurality of members which also seeks to reduce thickness/weight and suppress warpage, and further, no suggestion is made regarding the constitution for the improvement.
Further, in JP '823, since the radio wave transmitting material is molded by a method of injecting the material for forming it into a mold placed with the radio wave shielding material, the amount of injected resin increases, and when the integrated molded body is a plate material having a plane shape, there is room for improvement in reducing warpage due to heat shrinkage of the resin.
Furthermore, JP '649 discloses a configuration using an adhesive such as an acrylic adhesive for the joining layer, and although it is possible to form a thin wall or the like, there is a room for improvement with respect to securing a joining strength and reduction in warpage of a constituent member in a molded body with a plate material.
Accordingly, it could be helpful to provide an integrated molded body in which a plurality of structures are joined with a high joining strength, the joint boundary part has a good smoothness, reduction in warpage is possible even if the molded body has a constituent member of a plate material, and which enables reduction in weight/thickness, and a method of manufacturing the same.
We thus provide:
(1) An integrated molded body in which a resin member (C) comprising discontinuous carbon fibers and a thermoplastic resin is interposed between a plate material (A) one side surface of which is a design surface, and a resin member (B), characterized in that the integrated molded body has a first joining part at which the resin member (B) is joined to the resin member (C) and a second joining part at which at least a partial region of an outer peripheral edge part of the plate material (A) is joined to the resin member (C).
(2) The integrated molded body according to (1), wherein the discontinuous carbon fibers contained in the resin member (C) have a weight average fiber length of 0.3 to 3 mm.
(3) The integrated molded body according to (1) or (2), wherein the resin member (C) is a resin member molded by injection molding, and among linear expansion coefficients of the resin member (C), a linear expansion coefficient in a resin flow direction during injection molding is 1.0×10−7 to 4.0×10−5/K, and a linear expansion coefficient in a direction perpendicular to the resin flow direction is 1.0×10−7 to 2.0×10−5/K.
(4) The integrated molded body according to any one of, wherein a main component of the thermoplastic resin contained in the resin member (C) is a polycarbonate resin.
(5) The integrated molded body according to (4), wherein the resin member (C) contains at least one resin selected from a polybutylene terephthalate (PBT) resin, an acrylonitrile-butadiene-styrene (ABS) resin and a polyethylene terephthalate (PET) resin together with the polycarbonate resin.
(6) The integrated molded body according to any one of (1) to (5), wherein the resin member (C) has a density of 1.0 to 1.4 g/cm3.
(7) The integrated molded body according to any one of (1) to (6), wherein the resin member (C) has a fiber weight content of 5 to 30% by weight.
(8) The integrated molded body according to any one of (1) to (7), wherein a volume of the resin member (C) is 2 to 30 times a volume of the resin member (B).
(9) The integrated molded body according to any one of (1) to (8), wherein the second joining part is formed over the entire circumference of the outer peripheral edge part of the plate material (A).
(10) The integrated molded body according to any one of (1) to (9), wherein the plate material (A) and the resin member (B) are distanced from each other.
(11) The integrated molded body according to any one of (1) to (10), wherein at least a part of a surface on the design surface side of the integrated molded body has a region where the plate material (A), the resin member (B) and the resin member (C) are exposed.
(12) The integrated molded body according to any one of (1) to (11), wherein at least a part of the resin member (C) has a standing wall shape portion.
(13) The integrated molded body according to any one of (1) to (12), wherein the plate material (A) and the resin member (C) are joined via a thermoplastic resin layer (D).
(14) The integrated molded body according to any one of (1) to (13), wherein the resin member (B) comprises discontinuous glass fibers having a weight average fiber length of 0.1 to 0.7 mm and a thermoplastic resin.
(15) The integrated molded body according to any one of (1) to (14), wherein the resin member (B) is a radio wave transmitting member.
(16) The integrated molded body according to any one of (1) to (15), wherein the plate material (A) has a structure including any one of a metal member and a carbon fiber reinforced resin member.
(17) The integrated molded body according to (16), wherein the plate material (A) is a carbon fiber reinforced resin member impregnated with a thermosetting resin.
(18) An integrated molded body comprising a plate material (A) whose one side surface is a design surface and a resin member (C) joined to at least a part of an outer edge of the plate material (A), characterized in that the resin member (C) comprises discontinuous carbon fibers and a thermoplastic resin, a weight average fiber length of the discontinuous carbon fibers is 0.3 to 3 mm, and a main component of the thermoplastic resin is a polycarbonate resin.
(19) A method of manufacturing an integrated molded body comprising at least step [1] and step [2]:
[1] a step of placing a plate material (A), whose one side surface is a design surface, inside a resin member (B) in a mold at a condition where at least a part of the plate material (A) is distanced from the resin member (B), and
[2] a step of integrally joining the plate material (A) and the resin member (B) at least at an outer peripheral edge part of the plate material (A) by injection molding a resin member (C) into a space between the plate material (A) and the resin member (B).
(20) The method of manufacturing an integrated molded body according to (19), wherein the plate material (A) and the resin member (B) are integrated at a condition being distanced from each other, by placing the plate material (A) inside the resin member (B) in the mold at a condition being distanced from the resin member (B) and injection molding the resin member (C) into the space.
(21) The method of manufacturing an integrated molded body according to (19) or (20), wherein at least a part of a surface on the design surface side of the integrated molded body becomes a region where the plate material (A), the resin member (B) and the resin member (C) are exposed, by injection molding the resin member (C) into the space from a side opposite to the design surface.
It is thus possible to join a plurality of structures to each other at high joining strength with the joint boundary part having excellent smoothness, reduce warpage even if a molded body has a constituent member of a plate material, and realize a reduction in weight/thickness.
Hereinafter, examples will be explained referring to the drawings. Our molded bodies and methods are not limited to the drawings and examples.
As shown in
In the integrated molded body 1, the plate material (A) 2 shown in the perspective view of
By the condition where the resin member (C) 4 comprising discontinuous carbon fibers and a thermoplastic resin is interposed, and by the properties of a low specific gravity and a low shrinkage of the resin member (C) 4, a plurality of members constituting the integrated molded body 1 are joined with a high joining strength, and it is possible to reduce the warpage of the integrated molded body 1 having a plate material-shaped constituent member.
Further, it is preferred that the weight average fiber length of the discontinuous carbon fibers contained in the resin member (C) 4 is 0.3 to 3 mm.
Continuous fibers and discontinuous fibers will be defined. The continuous fibers indicate a state in that the reinforcing fibers contained in the integrated molded body 1 are arranged substantially continuously over the entire length or the entire width of the integrated molded body, and the discontinuous fibers indicate a state in that the reinforcing fibers are arranged discontinuously at a condition being separated. Generally, a unidirectional fiber reinforced resin, in which a resin is impregnated into reinforcing fibers aligned in one direction, corresponds to continuous fibers, and an SMC (Sheet Molding Compound) base material used for press molding, a pellet material containing reinforcing fibers used for injection molding or the like corresponds to the discontinuous fibers.
With respect to the discontinuous fibers, although pellet materials used for injection molding can be classified into two types of long fiber pellets and short fiber pellets, the long fibers are defined as fibers remaining in a member formed with discontinuous fibers in the integrated molded body 1 and having a weight average fiber length of 0.3 mm or more, and short fibers are defined as fibers having a weight average fiber length less than 0.3 mm.
By the condition where the reinforcing fibers remaining in the resin member (C) 4 are long fibers, the shrinkage of the resin member (C) 4 can be reduced, and the warpage of the integrated molded body 1 can be further reduced. In short fibers having a weight average fiber length of less than 0.3 mm, the effect on low shrinkage is weakened, and it may not be possible to sufficiently reduce the warpage of the integrated molded body 1. If the weight average fiber length exceeds 3 mm, the resin viscosity becomes high, and it may be difficult to uniformly fill the resin member (C) 4 up to corners of the mold during injection molding. The weight average fiber length of the discontinuous carbon fibers is preferably 0.4 to 2.8 mm, more preferably 0.7 to 1.5 mm, further preferably 0.9 to 1.2 mm.
The “weight average fiber length” does not mean to simply employ a number average, but a method of calculating a weight average molecular weight is applied to the calculation of the fiber length, and it means an average fiber length calculated from the following equation considering the contribution of the fiber length. However, the following equation is applied assuming that the fiber diameter and density of the reinforcing fibers are constant:
Weight average fiber length=Σ(Mi2×Ni)/Σ(Mi×Ni)
Mi: Fiber length (mm). Ni: Number of reinforcing fibers with fiber length Mi.
The above-described weight average fiber length can be measured by the following method. The molded article is heat-treated at 500° C. for 60 minutes, the reinforcing fibers in the molded article are taken out, and these reinforcing fibers are uniformly dispersed in water. After the dispersed water in which the reinforcing fibers are uniformly dispersed is sampled in a petri dish, it is dried, and observed with an optical microscope (magnification of 50 to 200 times). The lengths of 500 randomly selected reinforcing fibers are measured, and the weight average fiber length is calculated from the above-described equation.
Further, it is preferred that among linear expansion coefficients of the resin member (C) 4, a linear expansion coefficient in a resin flow direction is 1.0×10−7 to 4.0×10−5/K, and a linear expansion coefficient in a direction perpendicular to the resin flow direction is 1.0×10−7 to 2.0×10−5/K. The resin flow direction means such that when a mold cavity is filled with the resin, in a state where the resin advances from a gate serving as an inlet into which the resin flows toward the mold cavity, the resin advancing direction is defined as the resin flow direction, and a direction perpendicular thereto is defined as the direction perpendicular to the resin flow direction. The method of measuring this linear expansion coefficient will be described later.
By using a resin having a small linear expansion coefficient, the deformation amount of the resin member (C) 4 can be reduced, and the warpage of the integrated molded body 1 can be further reduced. For example, when a resin is flowed to form a shape such as injection molding, it is generally known that the reinforcing fibers contained in the resin are oriented in accordance with the flow direction of the resin. Therefore, a small linear expansion coefficient in each of two directions of a resin flow direction and a direction perpendicular to the resin flow direction is effective for reducing the warpage of the integrated molded body 1. If the linear expansion coefficient in the resin flow direction exceeds 4.0×10−5/K, or the linear expansion coefficient in the direction perpendicular to the resin flow direction exceeds 2.0×10−5/K, the amount of warpage of the integrated molded body 1 may become large. Although it is effective that both the linear expansion coefficient in the resin flow direction and the linear expansion coefficient in the direction perpendicular to it are smaller than 1.0×10−7/K for reducing the warpage of the integrated molded body 1, to achieve that, it is necessary to greatly increase the fiber content of the reinforcing fibers, which may hinder the flowability of the resin. The linear expansion coefficient of the resin member (C) 4 in the resin flow direction is preferably 2.0×10−7 to 3.8×10−5/K, more preferably 4.0×10−7 to 3.0×10−5/K, and further preferably 7.0×10−7 to 2.0×10−5/K. Further, linear expansion coefficient of the resin member (C) 4 in the direction perpendicular to the resin flow direction is preferably 2.0×10−7 to 1.8×10−5/K, more preferably 4.0×10−7 to 1.5×10−5/K, and further preferably 7.0×10−7 to 1.0×10−5/K.
Further, it is preferred that the main component of the thermoplastic resin contained in the resin member (C) 4 is a polycarbonate resin.
By using a polycarbonate resin, which has a smaller shrinkage than conventional nylon resins, for the resin member (C) 4, it is possible to reduce the warpage of the integrated molded body 1. Further, the resin absorbs less water, and the dependency on the surrounding humidity environment during use can be reduced. The main component means that the compounding weight ratio of the polycarbonate resin in the thermoplastic resin is 50% by weight or more. It is preferably 70% by weight or more, more preferably 90% by weight or more, and further preferably, it is all polycarbonate resin.
The polycarbonate resin is obtained by reacting a dihydric phenol with a carbonate precursor. It may be a copolymer obtained by using two or more dihydric phenols or two or more carbonate precursors. As examples of the reaction method, exemplified are an interfacial polymerization method, a melt transesterification method, a solid-phase transesterification method of a carbonate prepolymer, a ring-opening polymerization method of a cyclic carbonate compound or the like. Such a polycarbonate resin itself is known and, for example, the polycarbonate resin described in JP-A-2002-129027 can be used.
As examples of the dihydric phenol, exemplified are 1,1-bis(4-hydroxyphenyl)-3,3,5-trimethyl cyclohexane, bis(4-hydroxyphenyl)alkane (bisphenol A and the like), 2,2-bis{(4-hydroxy-3-methyl)phenyl}propane, a, a′-bis(4-hydroxyphenyl)-m-diisopropylbenzene, 9, 9-bi s(4-hydroxy-3-methylphenyl)fluorene and the like. Two or more types of these may be used. Among these, bisphenol A is preferable, and a polycarbonate resin more excellent in impact resistance can be obtained. On the other hand, a copolymer obtained by using bisphenol A and another dihydric phenol is excellent in high heat resistance or low water absorption.
As the carbonate precursor, for example, carbonyl halide, carbonic acid diester, haloformate or the like is used, and concretely, phosgene, diphenyl carbonate, dihaloformate of dihydric phenol or the like can be exemplified.
When producing a polycarbonate resin from the above-described dihydric phenol and carbonate precursor, a catalyst, a terminal stopper, an antioxidant that prevents oxidation of the dihydric phenol and the like may be used, as needed.
Further, the polycarbonate resin includes a branched polycarbonate resin obtained by copolymerizing a trifunctional or higher functional polyfunctional aromatic compound, a polyester carbonate resin obtained by copolymerizing an aromatic or aliphatic (including alicyclic) difunctional carboxylic acid, a copolymerized polycarbonate resin obtained by copolymerizing a difunctional alcohol (including an alicyclic group), and a polyester carbonate resin obtained by copolymerizing such a difunctional carboxylic acid and a difunctional alcohol together. These polycarbonate resins are also known. Moreover, two or more types of these polycarbonate resins may be used.
Although the molecular weight of the polycarbonate resin is not specified, one having a viscosity average molecular weight of 10,000 to 50,000 is preferable. If the viscosity average molecular weight is 10,000 or more, the strength of the molded article can be more improved. It is more preferably 15,000 or more, and further preferably 18,000 or more. On the other hand, if the viscosity average molecular weight is 50,000 or less, molding processability is improved. It is more preferably 40,000 or less, and further preferably 30,000 or less. When two or more polycarbonate resins are used, it is preferred that at least one viscosity average molecular weight is within the above-described range. In this example, it is preferred to use a polycarbonate resin having a viscosity average molecular weight of more than 50,000, preferably more than 80,000 as the other polycarbonate resin. Such a polycarbonate resin has high entropy elasticity, which is advantageous when used in combination with gas-assisted molding and the like, and it exhibits a property derived from the high entropy elasticity (anti-drip property, draw down property, and a property for improving melting property such as jetting improvement).
Further, it is preferred that in the resin member (C) 4, in addition to the polycarbonate resin, at least one resin selected from polybutylene terephthalate (PBT) resin, acrylonitrile-butadiene-styrene (ABS) resin and polyethylene terephthalate (PET) resin is contained.
Polybutylene terephthalate (PBT) resin, acrylonitrile-butadiene-styrene (ABS) resin, and polyethylene terephthalate (PET) resin are inferior in mechanical properties and impact properties to polycarbonate resin, but because they are excellent in flowability, they can be preferably used by containing them in the resin member (C) 4, for the purpose of improving the flowability of the polycarbonate resin. These resin types have a good compatibility with the polycarbonate resin, and they can be preferably used because the properties thereof hard to absorb water can suppress deformation of the resin member (C) 4 due to moisture absorption. The content relative to the polycarbonate resin is preferably 3 parts by weight or more and 50 parts by weight or less when the total weight of the mixed resin is 100 parts by weight, more preferably 5 parts by weight or more and 20 parts by weight or less, further preferably 8 parts by weight or more and 15 parts by weight or less. If the content exceeds 50 parts by weight, the mechanical properties and impact property of the resin member (C) 4 may not be sufficiently obtained, and if it is less than 3 parts by weight, the flowability may be insufficient.
Further, it is preferred that the density of the resin member (C) 4 is 1.0 to 1.4 g/cm3. By this, the weight of the integrated molded body 1 can be reduced. If the density exceeds 1.4 g/cm3, it may be difficult to reduce the weight of the integrated molded body 1. If the density is less than 1.0 g/cm3, the content of the reinforcing fibers added to the resin becomes small, and it may not be possible to sufficiently improve the strength of the integrated molded body 1. The density is more preferably 1.1 to 1.35 g/cm3, and further preferably 1.2 to 1.3 g/cm3.
Further, it is preferred that the fiber weight content of the resin member (C) 4 is 5 to 30% by weight. By this, the shrinkage of the resin member (C) 4 can be suppressed, and the warpage of the integrated molded body 1 can be reduced. If it is less than 5% by weight, it may be difficult to secure the strength of the integrated molded body 1, and if it exceeds 30% by weight, the filling of the resin member (C) 4 may be partially insufficient in the injection molding. The fiber weight content is more preferably 8 to 28% by weight, and further preferably 12 to 25% by weight.
Further, it is preferred that the volume of the resin member (C) 4 is 2 to 30 times the volume of the resin member (B) 3. By this, the shrinkage of the resin can be suppressed by increasing the proportion of the resin member (C) 4 present in the integrated molded body 1, and as a result, the warpage of the integrated molded body 1 can be reduced. If the volume of the resin member (C) 4 is less than 2 times the volume of the resin member (B) 3, it may be difficult to reduce the warpage of the integrated molded body 1. If the volume exceeds 30 times, the volume of the resin member (B) 3 becomes relatively small and a sufficient joining area may not be obtained. The volume is more preferably 5 to 25 times, further preferably 10 to 20 times.
Further, it is preferred that the second joining part 6 is formed over the entire outer peripheral edge part of the plate material (A) 2. As shown in
Further, it is preferred that the plate material (A) 2 and the resin member (B) 3 are placed at a condition distanced from each other. As shown in
Further, it is preferred that at least a part of the surface on the design surface side of the integrated molded body 1 has a region 7 where the plate material (A) 2, resin member (B) 3 and resin member (C) 4 are exposed. In the form of joining using an adhesive in the conventional technology, the adhesive may exude, and in such an instance, the exuding adhesive must be removed, and further, a very high dimensional accuracy is required for positioning between the members to be joined. On the other hand, as shown in
Further, it is preferred that at least a part of the resin member (C) 4 has a standing wall shape portion 8. By providing the standing wall shape portion 8 to the resin member (C) 4 arranged on the side surface portion of the integrated molded body 1 in a form of extending downwardly as shown in the plan view of
Further, in the perspective view of
Further, a structure is also preferred wherein the plate material (A) 2 and the joining resin member (C) 4 are joined via a thermoplastic resin layer (D) 9. As shown in the sectional view of
Further, it is preferred that the resin member (B) 3 comprises discontinuous glass fibers having a weight average fiber length of 0.1 to 0.7 mm and a thermoplastic resin. By making the resin member (B) 3 a resin member containing glass fibers, the resin member (B) 3 can be provided with a function as a radio wave transmitting member. Further, by setting the weight average fiber length of the discontinuous glass fibers at 0.1 to 0.7 mm, it is possible to secure the balance between the strength of the resin member (B) 3 and the flowability of the resin. If the weight average fiber length is less than 0.1 mm, the strength of the resin member (B) 3 may be insufficient. If the weight average fiber length exceeds 0.7 mm, the resin viscosity becomes high, which may make it difficult to uniformly fill the corners of the resin member (B) 3 during injection molding. The weight average fiber length is more preferably 0.2 to 0.6 mm, and further preferably 0.3 to 0.5 mm.
Further, a thermoplastic resin can be used as the resin member (B) 3, and a joined structure is formed wherein the thermoplastic resin of the resin member (B) 3 is melt-fixed to the resin member (C) 4. By this, a higher joining strength can be realized as the integrated molded body 1. The melt-fixed joined structure means a joined structure in which mutual members are molten by heat and fixed by being cooled. Further, a thermosetting resin can also be used as the resin member (B) 3, the thermoplastic resin layer (D) 9 is adhered in advance to the surface of the resin member (B) 3 which is to be joined to the resin member (C) 4, and thereafter, the resin member (C) 4 is injection molded. By this, the resin member (B) 3 is joined to the molten resin member (C) 4 via the thermoplastic resin layer (D) 9 to be able to realize a high joining strength as the integrated molded body 1. Further, by using a thermosetting resin for the resin member (B) 3, it is possible to obtain lightweight, thin-walled, high rigidity and impact resistance. As the thermoplastic resin layer (D) 9, a thermoplastic resin film or a non-woven fabric of thermoplastic resin can be appropriately used.
Further, it is preferred that the resin member (B) 3 is a radio wave transmitting member. As described above, by making the resin member (B) 3 as a resin member containing glass fibers, a radio wave transmitting function can be given.
Further, it is preferred that the plate material (A) 2 includes has a structure including any one of a metal member and a carbon fiber reinforced resin member. From the viewpoint of increasing the strength and rigidity of the integrated molded body 1, it is preferred to use a member having high strength and high rigidity, and further excellent in lightness, for the plate material (A) 2. From the viewpoint of high strength and high rigidity, it is preferred to use a metal member or a fiber reinforced resin member, and for the purpose of further improving the lightness, a sandwich structure, in which one or more kinds of core members selected from a resin sheet, a foam, and a material expanded with a discontinuous fiber reinforced resin prepared by containing discontinuous fibers in a resin in its thickness direction, are used as a core layer, and a metal member or a fiber reinforced resin member is used as a skin layer, and both sides of the core layers are sandwiched by skin layers, is more preferably employed. Furthermore, high rigidity and reduction in weight/thickness can be realized by using a carbon fiber reinforced resin member in which carbon fibers are used as the reinforcing fibers of the fiber reinforced resin member.
As the material of the metal member, can be exemplified an element selected from titanium, steel, stainless steel, aluminum, magnesium, iron, silver, gold, platinum, copper, nickel, or an alloy containing these elements as a main component. Further, a plating processing can be performed as needed.
As the resin used for the fiber reinforced resin member, the carbon fiber reinforced resin member or the core member, a thermoplastic resin or a thermosetting resin can be suitably used.
There is no particular limitation on the type of the thermoplastic resin forming the plate material (A) 2 or the resin member (B) 3, and any of the thermoplastic resins exemplified below can be used. For example, exemplified are polyester resins such as polyethylene terephthalate (PET) resin, polybutylene terephthalate (PBT) resin, polytrimethylene terephthalate (PTT) resin, polyethylene naphthalate (PEN) resin and liquid crystal polyester resin, polyolefin resins such as polyethylene (PE) resin, polypropylene (PP) resin and polybutylene resin, polyox-ymethylene (POM) resin, polyamide (PA) resin, polyarylene sulfide resin such as polyphenylene sulfide (PPS) resin, polyketone (PK) resin, polyether ketone (PEK) resin, polyetheretherketone (PEEK) resin, polyetherketoneketone (PEKK) resin, polyethernitrile (PEN) resin, fluorine resin such as polytetrafluoroethylene resin, crystalline resin such as liquid crystal polymer (LCP), and in addition to styrene-based resin, amorphous resins such as polycarbonate (PC) resin, polymethylmethacrylate (PMMA) resin, polyvinyl chloride (PVC) resin, polyphenylene ether (PPE) resin, polyimide (PI) resin, polyamide imide (PAI) resin, polyetherimide (PEI) resin, polysulfone (PSU) resin, polyethersulfone resin and polyarylate (PAR) resin, and as others, thermoplastic elastomers such as phenolic-based resin, phenoxy resin, further, polystyrene-based resin, and polyolefin-based resin, polyurethane-based resin, polyester-based resin, polyamide-based resin, polybutadiene-based resin, polyisoprene-based resin, fluorine-based resin and acrylonitrile-based resin, and thermoplastic resins selected from copolymers and modified products thereof. Among them, from the viewpoint of lightness of the obtained molded article, a polyolefin resin is preferred, from the viewpoint of strength, a polyamide resin is preferred, from the viewpoint of surface appearance, an amorphous resin such as polycarbonate resin, styrene-based resin or modified polyphenylene ether-based resin is preferred, from the viewpoint of heat resistance, a polyarylene sulfide resin is preferred, and from the viewpoint of continuously used temperature, a polyether ether ketone resin is preferably used.
Further, as examples of the thermosetting resin forming the plate material (A) 2, thermosetting resins such as unsaturated polyester resin, vinyl ester resin, epoxy resin, phenol (resole type) resin, urea/melamine resin, polyimide resin, maleimide resin and benzoxazine resin can be preferably used. These may be applied by blending two or more types. Among these, an epoxy resin is particularly preferable from the viewpoint of mechanical properties of a molded body and heat resistance. The epoxy resin is preferably contained as a main component of the resin used, to exhibit its excellent mechanical properties, and concretely, it is preferably contained at an amount of 60% by weight or more per the resin composition.
It is preferred to select and use at least one kind of organic fibers, ceramic fibers or metal fibers as the reinforcing fibers forming the plate material (A) 2, and two or more kinds of these reinforcing fibers may be used in combination. As the organic fibers, exemplified are aramid fibers, PBO fibers, polyphenylene sulfide fibers, polyester fibers, acrylic fibers, nylon fibers, polyethylene fibers, and the like, and as the ceramic fibers, exemplified are glass fibers, carbon fibers, silicon carbide fibers, silicon nitride fibers, and the like. Further, as the metal fibers, exemplified are aluminum fibers, brass fibers, stainless fibers, and the like. From the viewpoint of rigidity and lightness, it is preferred to use glass fibers or carbon fibers, and more preferably carbon fibers.
As the carbon fibers forming the plate material (A) 2 or the resin member (C) 4, from the viewpoint of weight reduction effect, carbon fibers of polyacrylonitrile (PAN)-based, pitch-based, rayon-based or the like having excellent specific strength and specific rigidity are preferably used.
Further, as the integrated molded body 1, one is also provided wherein the integrated molded body 1 is formed from a plate material (A) 2 whose one side surface is a design surface and a resin member (C) 4 which is joined to at least a part of the outer edge of the plate material (A) 2, the resin member (C) 4 comprises discontinuous carbon fibers and a thermoplastic resin, the weight average fiber length of the discontinuous carbon fibers is 0.3 to 3 mm, and the main component of the thermoplastic resin is a polycarbonate resin.
As shown in the plan view of
The preferable range of the weight average fiber length of the discontinuous carbon fibers and the preferable kind and compounding amount of the polycarbonate resin are as aforementioned. Further, as aforementioned, the density of the resin member (C) 4 is preferably 1.0 to 1.4 g/cm3, and the fiber weight content of the resin member (C) 4 is preferably 5 to 30% by weight.
Next, a method of manufacturing an integrated molded body will be explained with reference to the drawings.
We provide a method of manufacturing an integrated molded body 1 having at least steps [1] and [2]:
[1] a step of placing a plate material (A) 2, whose one side surface is a design surface, inside a resin member (B) 3 in a mold at a condition where at least a part of the plate material (A) 2 is distanced from the resin member (B) 3, and
[2] a step of integrally joining the plate material (A) 2 and the resin member (B) 3 at least at an outer peripheral edge part of the plate material (A) 2 by injection molding a resin member (C) 4 into a space between the plate material (A) 2 and the resin member (B) 3.
An example of the steps of the manufacturing method will be explained with reference to
First, the plate material (A) 2 shown in
Thereafter, as shown in
Further, in the manufacturing method, a method is preferred wherein the plate material (A) 2 and the resin member (B) 3 are integrated at a condition being distanced from each other, by placing the plate material (A) 2 inside the resin member (B) 3 in the mold at a condition being distanced from the resin member (B) 3 and injection molding the resin member (C) 4 into the space.
Further, in the manufacturing method, it is preferred that at least a part of a surface on the design surface side of the integrated molded body 1 becomes a region where the plate material (A) 2, the resin member (B) 3 and the resin member (C) 4 are exposed, by injection molding the resin member (C) 4 into the space from a side opposite to the design surface.
As shown in
Hereinafter, the integrated molded body 1 and the method of manufacturing the same will be concretely explained by way of examples, but the following examples do not limit this disclosure. First, the determination methods used in the examples will be described below.
A resin used for measurement was molded using a mold having a mold cavity of 60 mm in length×60 mm in width×2 mm in depth, based on type D2 of JIS K7152-3. Using SE75DUZ-C250 injection molding machine supplied by Sumitomo Heavy Industries, Ltd., when the matrix resin was a polycarbonate resin, set were injection time: 10 seconds, injection speed: 30 mm/s, back pressure: 10 MPa, cylinder temperature: 300° C., and mold temperature: 100° C. In a nylon resin, molding was performed changing the cylinder temperature to 260° C. and the mold temperature to 60° C.
The dimensions of the molded article were measured in the resin flow direction of the obtained flat plate test piece and in the direction perpendicular to the resin flow direction, and the molding shrinkage in each direction was determined using the following equation. The resin advancing direction when filling in the mold was defined as the resin flow direction. Further, the measurement of the dimensions of the molded article was performed immediately after molding and after immersion in 20° C. water.
Molding shrinkage(%)=(mold cavity size−molded article size)/(mold cavity size)×100
The flowability of the resin was confirmed using an Archimedes type spiral flow mold (flow path width 10 mm×thickness 2 mm). The injection conditions when the matrix resin was a polycarbonate resin were set at injection time: 10 seconds, injection speed: 100 mm/s, injection pressure: 60 MPa, back pressure: 10 MPa, cylinder temperature: 300° C., and mold temperature: 80° C. In a nylon resin, set were the cylinder temperature: 260° C. and the mold temperature: 60° C. The length of the molded article in the flow path direction was measured.
To determine the electric field shielding property in the region of the resin member (B) 3 of the integrated molded body 1, it was evaluated using KEC method. When the electric field strength of the space measured when there is no measurement sample is E0 [V/m] and the electric field strength of the space measured when there is a measurement sample is EX [V/m], the electric field shielding property is determined by the following equation. With respect to the sign of the measured value, the positive direction is a direction in which a shielding effect is exhibited.
Electric field shielding property(shielding effect)=20 log10 E0/EX[dB]
The radio wave transmission of the resin member (B) was determined from the measurement results of the measured electric field shielding properties. As a criterion for determining the radio wave transmission, 0 dB or more and less than 10 dB was determined to be present with radio wave transmission, and 10 dB or more was determined to be not present with radio wave transmission.
The weight average fiber length Lw of the reinforcing fibers contained in the resin member (B) 3 and resin member (C) 4 is measured. A part of the resin member (B) 3 or resin member (C) 4 to be measured from the integrated molded body 1 was cut out and heated in an electric furnace at 500° C. for 60 minutes to sufficiently incinerate and remove the resin so that only the reinforcing fibers were separated. 400 or more fibers were randomly extracted from the separated reinforcing fibers. The fiber lengths of these extracted reinforcing fibers were measured using an optical microscope, the lengths of 400 fibers were measured to the unit of 1 μm, and the weight average fiber length Lw was calculated using the following equation:
Weight average fiber length Lw=Σ(Mi2×Ni)/Σ(Mi×Ni)
Mi: Fiber length (mm)
Ni: Number of reinforcing fibers with fiber length Mi.
The density of the resin member (B) 3 or resin member (C) 4 cut out from the integrated molded body 1 was determined using submersible substitution method.
The fiber weight content of resin member (B) 3 and resin member (C) 4 was determined by the following method. The resin member (B) or resin member (C) to be determined was cut out from the integrated molded body 1 and the weight w0 (g) thereof was measured. Next, the cut-out sample was heated in air at 500° C. for 1 hour to sufficiently incinerate and remove the resin component, and the weight w1 (g) of the remaining reinforcing fibers was measured. The fiber weight content (wt %) was determined using the following equation. The measurement was performed at n=3, and the average value was used.
Fiber weight content(wt %)=(weight of reinforcing fibers w1/weight of cut sample w0)×100
(7) Warpage Amount of Integrated Molded Body Immediately after Molding
In a state where the design surface side of the box-shaped integrated molded body 1 faced upward, the displacement (mm) in the thickness direction of the top plate (plate material (A) 2) was measured within 1 hour from the molding as follows. The measuring points were set at the central portion of the top plate (plate material (A) 2), the four corner portions of the integrated molded body 1, and four central portions of respective long sides and short sides (total 9 points). The measurement points other than the central portion of the top plate (plate material (A) 2) were 2 mm inside from each long side and each short side, and a three-dimensional measuring instrument was used for the measurement.
The warpage amount on the long side and the short side was derived from the displacement (mm) at the remaining 8 points, which does not include the displacement (mm) at the central portion of the top plate (plate material (A) 2). For the warpage amount on the long side, first, among the three displacements (mm) obtained from one long side, the distance between the straight line connecting the two end points and the center point was determined. Next, in the same manner, the distance between the straight line connecting the two end points and the center point was determined from the other long side, and the average value of the distances determined from the two long sides was used as the warpage amount of the long side. Similarly, the warpage amount of the short side was derived.
The warpage amount of diagonal was derived from the displacement (mm) at the center of the top plate (plate material (A) 2) and the displacements (mm) at the four corner portions. Similar to the method of deriving the warpage amount on the long side, the distance between the straight line connecting the two diagonal corners of the integrated molded body 1 and the central point of the top plate (plate material (A) 2) was determined with respect to each of the two diagonals, and the average value of those distances was taken as the warpage amount of the diagonal.
Further, the value obtained by summing the obtained respective warpage amounts was evaluated according to the following criteria. A, B and C are acceptable, and D is not acceptable.
A: The total of respective warpage amounts is less than 1.0 mm.
B: The total of respective warpage amounts is 1.0 mm or more and less than 2.0 mm.
C: The total of respective warpage amounts is 2.0 mm or more and less than 3.0 mm.
D: The total of respective warpage amounts is 3.0 mm or more.
(8) Warpage Amount of Integrated Molded Body after Moisture Absorption
After leaving the integrated molded body 1 for 48 hours in an environment of a temperature of 50° C. and a humidity of 95%, it was held in an environment of a temperature of 20° C. and a humidity of 40% for 1 hour and, then, the warpage amount of the integrated molded body was determined in a manner similar to that in the above-described item (7). However, the measurement points were only the two long sides of the integrated molded body 1, and the average value of these two warpage amounts was used as the warpage amount after moisture absorption and evaluated according to the following criteria. A, B and C are acceptable, and D is not acceptable.
A: The total of respective warpage amounts is less than 1.0 mm.
B: The total of respective warpage amounts is 1.0 mm or more and less than 2.0 mm.
C: The total of respective warpage amounts is 2.0 mm or more and less than 3.0 mm.
D: The total of respective warpage amounts is 3.0 mm or more.
The comprehensive evaluation of the warpage amount of the integrated molded body 1 was evaluated according to the following criteria based on the evaluation results of the warpage amounts immediately after molding and after moisture absorption. A, B and C are acceptable, and D is not acceptable.
A: When all are determined as A
B: When C and D determinations are not included and at least one is determined as B
C: When D determination is not included and at least one is determined as C
D: When at least one is determined as D
(10) Measurement of linear expansion coefficient of resin used for resin member (C)
To measure the linear expansion coefficient of the resin used for the resin member (C) 4, a square plate was produced using a mold having a mold cavity of 60 mm in length×60 mm in width×5 mm in depth. A cubic test piece having a side of 5 mm was cut out from this square plate, and the linear expansion coefficient was measured using a thermomechanical measuring device (TMA). The upper and lower surfaces of the test piece were surfaced in advance with a water resistant abrasive paper #1500. The measurement was performed under the condition of a temperature elevation rate of 5° C./min while a load of 0.05 N was applied. The linear expansion coefficient was calculated from the average slope of the obtained straight line in the zone from −50° C. to 125° C. The measurement direction was performed in two directions of a resin flow direction and a direction perpendicular to the resin flow direction. In this measurement, the advancing direction in which the resin was filled into the cavity of the mold was taken as the flow direction of the resin in the test piece. When the linear expansion coefficient of the resin used for the resin member (C) was measured after actually molding the integrated molded body, particularly, when the resin member (C) was a resin member molded by injection molding, an appropriate small-size sample was cut out from the resin member (C), only the resin in the sample was burned off to leave only the aggregates of discontinuous carbon fibers, and the direction in which most discontinuous carbon fibers in the aggregates of discontinuous carbon fibers were oriented was taken as the resin flow direction. After specifying the resin flow direction, from any part of the resin member (C) in the integrated molded body, in the same manner as above, a test piece having a shape of a cube with one side of 5 mm or a flat plate of a square with one side of 5 mm and an arbitrary thickness, or a test piece having a shape corresponding thereto, was cut out, and the linear expansion coefficient was measured and calculated in the same manner as described above in the two directions of the resin flow direction and the directions perpendicular to the flow direction. The unit of the linear expansion coefficient is [/K].
Further, based on the result of determining the linear expansion coefficient in each direction, the evaluation was carried out by the following criteria. In all examples, A, B, and C are acceptable, and D is not acceptable. Furthermore, a comprehensive evaluation of the linear expansion coefficient was performed based on the evaluation in each direction.
Criteria for evaluating linear expansion coefficient in the flow direction
A: Linear expansion coefficient is less than 2.0×10-5/K.
B: Linear expansion coefficient is 2.0×10−5/K to 3.0×10−5/K.
C: Linear expansion coefficient is 3.0×10−5/K to 4.0×10−5/K.
D: Linear expansion coefficient exceeds 4.0×10−5/K.
Criteria for evaluating linear expansion coefficient in the direction perpendicular to the flow direction
A: Linear expansion coefficient is less than 1.0×10−5/K.
B: Linear expansion coefficient is 1.0×10−5/K to 1.5×10−5/K.
C: Linear expansion coefficient is 1.5×10−5/K to 2.0×10−5/K.
D: Linear expansion coefficient exceeds 2.0×10−5/K.
Comprehensive evaluation of linear expansion coefficient
A: When both the evaluation results in two directions are determined as A
B: When the evaluation results in two directions do not include C and D, and at least one is determined as B
C: When the evaluation results in two directions do not include D, and at least one is determined as C
D: When at least one of the evaluation results in the two directions is determined as D
At the joint part of the integrated molded body 1, using a surface roughness meter, the head of the surface roughness meter was scanned to cross the joint part perpendicularly to the joint boundary line, and the surface roughness of the integrated molded body 1 was measured (the measuring method was based on JIS-B-0633 (2001)). The roughness curve was determined from the displacement in the thickness direction of the plate material (A) 2 (referred to as Y direction, unit: μm) and the measurement stroke (unit: mm). As the measurement conditions, a measurement stroke of 20 mm, a measurement speed of 0.3 mm/s, a cutoff value of 0.3 mm, a filter type of Gaussian, and no tilt correction were selected. The joint part was set at a portion of 10 mm, which was the midpoint of the measurement stroke. The difference between the maximum Y-direction displacement of the peak and the minimum Y-direction displacement of the valley bottom in the obtained roughness curve was defined as the level difference of the joint part. In this example, “Surfcom” 480A manufactured by Tokyo Seimitsu Co., Ltd. was used as the surface roughness meter. By the above-described method, the level differences of the respective joint parts between the plate material (A) 2 and the resin member (C) 4, the plate material (A) 2 and the resin member (B) 3, and the resin member (B) 3 and the resin member (C) 4 were determined. The determined level difference of the joint part was evaluated according to the following criteria. Further, comprehensive evaluation was performed based on the following criteria based on the determination result of the level difference of each joint part. In all examples, A, B, and C are acceptable, and D is not acceptable.
Criteria for evaluating level difference of each joint part
A: Level difference at the joint part is less than 8 μm.
B: Level difference at the joint part is 8 μm or more and less than 10 μm.
C: Level difference at the joint part is 10 μm or more and less than 12 μm.
D: Level difference at the joint part is 12 μm or more.
Criteria of determining comprehensive evaluation for level difference of joint part
A: When all are determined as A
B: When C and D determinations are not included and at least one is determined as B
C: When D determination is not included and at least one is determined as C
D: When at least one is determined as D
Based on the judgment result of three comprehensive evaluations of the warpage amount of the integrated molded body 1, the linear expansion coefficient of the joining resin (C) 4, and the smoothness of the joint boundary line of the integrated molded body 1, the comprehensive evaluation of the integrated molded body 1 was performed according to the following criteria. A, B and C are acceptable, and D is not acceptable.
A: When all three comprehensive evaluations are determined as A
B: When C and D determinations among three comprehensive evaluations are not included and at least one is determined as B
C: When D determination among three comprehensive evaluations is not included and at least one is determined as C
D: When at least one among three comprehensive evaluations is determined as D
Spinning and calcination were performed from a polymer containing polyacrylonitrile as a main component to obtain a continuous carbon fiber bundle having a total number of 12,000 filaments. A sizing agent was applied to this continuous carbon fiber bundle by a dipping method, and dried in heated air to obtain a PAN-based carbon fiber bundle. The properties of this PAN-based carbon fiber bundle were as follows:
Single fiber diameter: 7 μm
Mass per unit length: 0.83 g/m
Density: 1.8 g/cm3
Tensile strength: 4.0 GPa
Tensile elastic modulus: 235 GPa.
An epoxy resin (base resin: dicyandiamide/dichlorophenylmethylurea curing type epoxy resin) was applied on a release paper using a knife coater to obtain an epoxy resin film.
The PAN-based carbon fiber bundles prepared in Material Composition Example 1 were arranged in one direction in a form of a sheet, two epoxy resin films prepared in Material Composition Example 2 were stacked on both sides of the carbon fibers, and the resin was impregnated by heating and pressing, to prepare a unidirectional prepreg having a carbon fiber weight content of 70% and a thickness of 0.15 mm.
Polyester resin (“Hytrel” (registered trademark) 4057 supplied by Toray-Dupont Co., Ltd.) was charged from the hopper of a twin-screw extruder, melt-kneaded by the extruder, and then extruded from a T-shaped die. Thereafter, it was cooled and solidified by taking it off with a chill roll at 60° C. to prepare a polyester resin film having a thickness of 0.05 mm. This was used as a thermoplastic adhesive film (A).
GF reinforced polycarbonate resin GSH2030KR (supplied by Mitsubishi Engineering Plastics Co., Ltd., polycarbonate resin matrix, fiber weight content: 30 wt %) was used.
Polycarbonate resin (“Panlite” (registered trademark) L-1225L, supplied by Teijin Chemicals Ltd.) was used.
The resin-impregnated reinforcing fiber bundle obtained by impregnating the carbon fibers prepared in Material Composition Example 1 with an epoxy resin was passed through the coating die for the wire coating method installed at the tip of a TEX-30α type twin screw extruder supplied by Japan Steel Works, Ltd. The polycarbonate resin of Material Composition Example 6 was supplied from the main hopper of the TEX-30α type twin-screw extruder, molten and kneaded, and then discharged into the die in a molten state to be continuously placed to coat the periphery of the resin-impregnated reinforcing fiber bundle. The obtained continuous molding material was cooled, and then cut with a cutter to obtain a long CF pellet-shaped long CF reinforced polycarbonate resin (fiber weight content: 20 wt %) having a length of 7 mm. Material Composition Example 8: Long CF (carbon fiber) reinforced polycarbonate resin (A)
The polycarbonate resin of Material Composition Example 6 and the long CF pellet-shaped long CF reinforced polycarbonate obtained in Material Composition Example 7 were dry blended to obtain a long CF reinforced polycarbonate resin having a fiber weight content of 15 wt %.
Aluminum sheet AL5052, thickness: 1.25 mm
Material Composition Example 10: Aluminum foil
Aluminum sheet AL5052, thickness: 0.3 mm
On the PAN-based carbon fiber bundles prepared in Material Composition Example 1 were arranged in one direction in a form of a sheet, the thermoplastic adhesive film (A) prepared in Material Composition Example 4 was overlaid and the resin was impregnated by heating and pressing, to obtain a thermoplastic unidirectional prepreg having a carbon fiber weight content of 60% and a thickness of 0.15 mm.
Short CF reinforced polycarbonate resin CFH2020 (supplied by Mitsubishi Engineering Plastics Co., Ltd., polycarbonate resin matrix, fiber weight content: 20 wt %) and polycarbonate resin H-3000 (supplied by Mitsubishi Engineering Plastics Co., Ltd., polycarbonate resin matrix, unreinforced) were dry blended to adjust the fiber weight content to 15 wt %.
Pellets of polyamide resin (CM8000 supplied by Toray Industries, Inc., quaternary copolymerized polyamide 6/66/610/12, melting point: 130° C.) were press-molded to obtain a thermoplastic adhesive film having a thickness of 0.05 mm. This was used as a thermoplastic adhesive film (B).
GF reinforced nylon resin CM1011G-30 (supplied by Toray Industries, Inc., nylon 6 resin matrix, fiber weight content: 30 wt %, melting point: 225° C.) was used.
Carbon long fiber pellet TLP-1146S (supplied by Toray Industries, Inc., nylon 6 resin matrix, fiber weight content: 20 wt %) and nylon 6 resin CM1007 (supplied by Toray Industries, nylon 6 resin matrix, unreinforced) were dry blended to obtain a long CF reinforced nylon resin having a fiber weight content of 15 wt %.
The polycarbonate resin of Material Composition Example 6 and the long CF pellet-shaped long CF reinforced polycarbonate prepared in Material Composition Example 7 were dry blended to obtain a long CF reinforced polycarbonate resin having a fiber weight content of 8 wt %.
By the same material and manufacturing method as those in Material Composition Example 7, a long fiber pellet-shaped long CF reinforced polycarbonate resin (fiber weight content: 40 wt %) was obtained. However, since the amount of the resin for coating the periphery of the resin-impregnated reinforced fiber bundle was small, many cracks in the pellet occurred.
The polycarbonate resin of Material Composition Example 6 and the long fiber pellet-shaped long CF reinforced polycarbonate resin obtained in Material Composition Example 17 were dry blended to obtain a long CF reinforced polycarbonate resin having a fiber weight content of 25 wt %.
The long fiber pellet-shaped long CF reinforced polycarbonate obtained in Material Composition Example 7 and PBT resin 1401X31 (supplied by Toray Industries, Inc., PBT resin matrix, unreinforced) were dry blended to obtain a long. CF reinforced polycarbonate resin/PBT resin having a fiber weight content of 15 wt %.
The long fiber pellet-shaped long CF reinforced polycarbonate resin obtained in Material Composition Example 7 and an ABS resin QF (supplied by Denka Co., Ltd., PBT resin matrix, unreinforced) were dry blended to obtain a long CF reinforced polycarbonate resin/PBT resin having a fiber weight content of 15 wt %.
The long fiber pellet-shaped long CF reinforced polycarbonate resin obtained in Material Composition Example 7 and a PET resin KS710B-8B (supplied by Kuraray Co., Ltd., PET resin matrix, unreinforced) were dry blended to obtain long CF reinforced polycarbonate resin/PET resin having a fiber weight content of 15 wt %.
Glass fiber cloth prepreg R-5 (supplied by Nitto Boseki Co., Ltd., glass fiber, epoxy resin, glass fiber weight content: 60% by mass, thickness: 0.15 mm).
90% by mass of unmodified polypropylene (“Prime Polypro” (registered trademark) J105G, melting point: 160° C., supplied by Prime Polymer Co., Ltd.) and 10% by mass of acid-modified polypropylene (“Admer” (registered trademark) QE510, melting point: 160° C., supplied by Mitsui Chemicals, Inc.) were prepared and these were dry blended. This dry blended product was charged from the hopper of a twin-screw extruder, molten and kneaded by the extruder, and then, extruded from a T-shaped die. Thereafter, it was cooled and solidified by taking it off with a chill roll at 60° C. to obtain a polypropylene film having a thickness of 0.65 mm.
The properties of the resins of Material Composition Examples 8, 12, 15, 19, 20 and 21 are summarized in Table 1.
The sectional views of a pair of molds facing each other to obtain the integrated molded bodies 1 shown in
The unidirectional prepreg obtained in Material Composition Example 3 and the thermoplastic adhesive film (A) obtained in Material Composition Example 4 were each adjusted to a size of 400 mm square, and then, they were laminated at an order of [unidirectional prepreg 0°/unidirectional prepreg 90°/unidirectional prepreg 0°/unidirectional prepreg 90°/unidirectional prepreg 90°/unidirectional prepreg 0°/unidirectional prepreg 90°/unidirectional prepreg 0°/thermoplastic adhesive film (A)]. The longitudinal direction of the integrated molded body 1 was set to 0° direction. The laminate was sandwiched between release films and further sandwiched by tool plates. As the thickness adjustment, a spacer having a thickness of 1.25 mm was inserted between the tool plates. After the tool plate was placed on the board surface having a board surface temperature of 150° C., the board surface was closed, and heated and pressed at 3 MPa. After 5 minutes passed from the pressing, the board surface was opened to obtain a flat plate-shaped CFRP (carbon fiber reinforced plastic) plate with a thermoplastic adhesive film (A) having a thickness of 1.25 mm. This was designated as the plate material (A) 2 to which the thermoplastic resin layer (D) 9 was adhered.
Next, injection molding was performed using the GF reinforced polycarbonate resin of Material Composition Example 5 to prepare a resin member (B) 3 having the shape shown in
Next, as shown in
As shown in
An integrated molded body was manufactured in the same manner as in Example 1 other than the condition where the volume ratio of the resin member (C) 4 to the resin member (B) 3 was adjusted to 3. The properties of the integrated molded body 1 are summarized and shown in Table 2.
An integrated molded body was manufactured in the same manner as in Example 1 other than the condition where the volume ratio of the resin member (C) 4 to the resin member (B) 3 was adjusted to 25. The properties of the integrated molded body 1 are summarized and shown in Table 2.
An integrated molded body was manufactured in the same manner as in Example 1 other than the condition where the volume ratio of the resin member (C) 4 to the resin member (B) 3 was adjusted to 40. The properties of the integrated molded body 1 are summarized and shown in Table 2.
An integrated molded body 1 was manufactured in the same manner as in Example 1 other than the condition where the aluminum plate (plate material (A) 2) of Material Composition Example 9 was used. To secure a closed contact property with the long CF reinforced polycarbonate resin (A) (resin member (C) 4) of Material Composition Example 8, after applying an adhesive to the region corresponding to the second joining part of the aluminum plate (plate material (A) 2), they were integrated by injection molding. The properties of the integrated molded body 1 are summarized and shown in Table 2.
After the unidirectional prepreg obtained in Material Composition Example 3, the thermoplastic adhesive film (A) obtained in Material Composition Example 4, and the aluminum foil obtained in Material Composition Example 10 were each adjusted to a size of 400 mm square, they were laminated in the order of [aluminum foil/unidirectional prepreg 90°/unidirectional prepreg 0°/unidirectional prepreg 90°/unidirectional prepreg 90°/unidirectional prepreg 0°/unidirectional prepreg 90°/aluminum foil/thermoplastic adhesive film (A)]. By press molding the laminate in the same manner as in Example 1, a flat plate-shaped aluminum foil/CFRP plate with a thermoplastic adhesive film (A) having a thickness of 1.25 mm was obtained. This was designated as the plate material (A) 2 to which the thermoplastic resin layer (D) 9 was adhered. In the subsequent steps, the integrated molded body 1 was manufactured in the same manner as in Example 1. The properties of the integrated molded body 1 are summarized and shown in Table 2.
After the thermoplastic unidirectional prepreg obtained in Material Composition Example 11 and the thermoplastic adhesive film (A) obtained in Material Composition Example 4 were each adjusted to a size of 400 mm square, they were laminated in the order of [thermoplastic unidirectional prepreg 0°/thermoplastic unidirectional prepreg 90°/thermoplastic unidirectional prepreg 0°/unidirectional prepreg 90°/thermoplastic unidirectional prepreg 90°/thermoplastic unidirectional prepreg 0°/thermoplastic unidirectional prepreg 90°/thermoplastic unidirectional prepreg 0°/thermoplastic adhesive film (A)]. A flat plate-shaped thermoplastic CFRP plate with a thermoplastic adhesive film (A) having a thickness of 1.25 mm was obtained in the same manner as in Example 1 other than the condition where the heat pressing was performed at a board temperature of 180° C., a surface pressure of 3 MPa, and a pressing time of 6 minutes, and after the board surface temperature was lowered to 60° C. by flowing a cooling water to the board surface, a molded plate was taken out. This was designated as the plate material (A) 2 to which the thermoplastic resin layer (D) 9 was adhered. In the subsequent steps, the integrated molded body 1 was manufactured in the same manner as in Example 1. The properties of the integrated molded body 1 are summarized and shown in Table 2.
An integrated molded body 1 was manufactured in the same manner as in Example 1 other than the condition where the back pressure of the injection molding condition at the time of integral molding was changed to 20 MPa. The properties of the integrated molded body 1 are summarized and shown in Table 3.
An integrated molded body 1 was manufactured in the same manner as in Example 1 other than the condition where the back pressure of the injection molding condition at the time of integral molding was changed to 2 MPa. The properties of the integrated molded body 1 are summarized and shown in Table 3.
The thermoplastic adhesive film (B) obtained in Material Composition Example 13, the GF reinforced nylon resin obtained in Material Composition Example 14, and the long CF reinforced nylon resin obtained in Material Composition Example 15 were used. Using the thermoplastic adhesive film (B) instead of the thermoplastic adhesive film (A), a plate material (A) 2 was manufactured in the same manner as in Example 1. Next, an integrated molded body 1 was manufactured in the same manner as in Example 1 other than the condition where the GF reinforced nylon resin was used for the resin member (B) 3 and the long CF reinforced nylon resin was used for the resin member (C) 4. The molding was performed by changing the conditions for injection molding to a cylinder temperature of 260° C. and a mold temperature of 60° C. The properties of the integrated molded body 1 are summarized and shown in Table 3.
An integrated molded body 1 was obtained in the same manner as in Example 1 other than the condition where the long CF reinforced polycarbonate resin (B) obtained in Material Composition Example 16 was used as the resin member (C) 4. The properties of the integrated molded body 1 are summarized and shown in Table 3.
An integrated molded body 1 was obtained in the same manner as in Example 1 other than the condition where the long CF reinforced polycarbonate resin (D) obtained in Material Composition Example 18 was used as the resin member (C) 4. The properties of the integrated molded body 1 are summarized and shown in Table 3.
An integrated molded body 1 was obtained in the same manner as in Example 1 other than the condition where the long CF reinforced polycarbonate resin (C) obtained in Material Composition Example 17 was used as the resin member (C) 4. The properties of the integrated molded body 1 are summarized and shown in Table 3.
An integrated molded body 1 was obtained in the same manner as in Example 1 other than the condition where the long CF reinforced polycarbonate resin/PBT resin obtained in Material Composition Example 19 was used as the resin member (C) 4. The properties of the integrated molded body 1 are summarized and shown in Table 3.
An integrated molded body 1 was obtained in the same manner as in Example 1 other than the condition where the long CF reinforced polycarbonate resin/ABS resin obtained in Material Composition Example 20 was used as the resin member (C) 4. The properties of the integrated molded body 1 are summarized and shown in Table 3.
An integrated molded body 1 was obtained in the same manner as in Example 1 other than the condition where the long CF reinforced polycarbonate resin/PET resin obtained in Material Composition Example 21 was used as the resin member (C) 4. The properties of the integrated molded body 1 are summarized and shown in Table 3.
An integrated molded body 1 was manufactured in the same manner as in Example 1 other than the condition where the resin member (B) 3 was manufactured using the glass fiber reinforced sheet obtained in Material Composition Example 22. The resin member (B) 3 was manufactured by stacking 40 glass fiber reinforced sheets each cut in a size of 200 mm square in the thickness direction to obtain a 200 mm square x 6.0 mm thick GFRP (glass fiber reinforced plastic) plate. It was adjusted to a resin member (B) 3 having the shape shown in
An integrated molded body 1 was manufactured in the same manner as in Example 1 other than the condition where the CF reinforced polycarbonate resin obtained in Material Composition Example 5 was used as the resin member (C) 4. The properties of the integrated molded body 1 are summarized and shown in Table 4.
An integrated molded body 1 was manufactured in the same manner as in Example 1 other than the condition where the short CF reinforced polycarbonate resin obtained in Material Composition Example 12 was used as the resin member (C) 4. The properties of the integrated molded body 1 are summarized and shown in Table 4.
An integrated molded body 1 having the shape shown in
Our integrated molded body can be effectively used for automobile interior/exterior, electric/electronic device housings, bicycles, structural materials for sporting goods, aircraft interior materials, transportation boxes and the like.
| Number | Date | Country | Kind |
|---|---|---|---|
| 2018-109587 | Jun 2018 | JP | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/JP2019/021102 | 5/28/2019 | WO | 00 |
