1. Technical Field
The present disclosure generally relates to a housing, a method for manufacturing the housing, and an electronic device using the housing.
2. Description of Related Art
A waterproof housing is provided for conventional electronic devices by positioning waterproof gaskets at the gaps of the electronic devices housing. The waterproof gaskets prevent moisture from contacting the electronic components within the electronic device to cause short-circuit or even damage the electronic device. However, under a large water pressure, moisture is still likely to seep into the waterproof housing, causing damage to the electronic device. Consequently, the conventional waterproof housing fails to make electronic devices completely and effectively waterproof.
Therefore, there is room for improvement within the art.
Many aspects of the embodiments can be better understood with reference to the following drawings. The components in the drawings are not necessarily drawn to scale, the emphasis instead being placed upon clearly illustrating the principles of the exemplary housing, method for manufacturing the housing, and electronic device using the housing. Moreover, in the drawings, like reference numerals designate corresponding parts throughout the several views. Wherever possible, the same reference numbers are used throughout the drawings to refer to the same or like elements of an embodiment.
The base body 10 can be made by insert molding. The base body 10 can be made of thermoplastic resin material or thermosetting resin material. The thermoplastic resin material is selected from a group consisting of polyethylene (PE), polyvinyl chloride (PVC), polypropylene (PP), polystyrene (PS), acrylonitrile-butadiene-styrene plastics (ABS), nylon, polycarbonate (PC), polyamide (PA), polyacetal (POM), thermoplastic polyurethane elastomer (TPU), polyphenyl ether, polysulfone (PSF), and polytetrafluroethylene (PTFE). The thermosetting resin material is selected from a group consisting of epoxy resin, phenolic resin (PF), thermosetting polyurethane and silicone resin.
The waterproof portion 30 can be made of thermoplastic resin material. In the embodiment, the waterproof portion 30 is made of thermoplastic resin material containing coupling agent modified nano calcium carbonate, water-absorbent acrylic resin and TPU. In the thermoplastic resin, the mass percentage of the coupling agent modified nano calcium carbonate is about 2% to about 3%, the mass percentage of the water-absorbent acrylic resin is about 3% to about 5%, and the mass percentage of the TPU is about 92% to about 95%. The coupling agent modified nano calcium carbonate provides a high compatibility between the water-absorbent acrylic resin and TPU.
The hydrophobic layer 50 mainly contains fluoroalkyl-modified nano silicon dioxide or fluoroalkyl-modified nano calcium carbonate. The hydrophobic layer 50 has a thickness of about 150 nm to about 300 nm.
A method for manufacturing the housing 100 may at least includes the following steps:
A base body 10 is provided.
Coupling agent is dispersed in an organic solvent and left standing for about 20 min to about 30 min, and then nano calcium carbonate is added in the mixture. The mixture is stirred at a speed about 700 revolutions per minute (r/min) to about 2000 r/min, followed by a filtering process to separate out the coupling agent modified nano calcium carbonate.
The ratio of the nano calcium carbonate, the coupling agent, and organic solvent is about 3 gram (g) to about 5 g of the nano silicon dioxide, about 1 g to about 3 g of the coupling agent, and the organic solvent may have a volume of about 97 ml to about 99 ml. The coupling agent modified nano calcium carbonate has a particle size in a range of about 20 nm to about 80 nm.
The coupling agent can be titanate coupling agent, silane coupling agent or aluminate coupling agent.
The organic solvent can be at least one selected from the group consist of isopropyl alcohol, ethanol and butanol.
The coupling agent modified nano calcium carbonate, water-absorbent acrylic resin and TPU are mixed uniformly to make a mixture resin material. In the mixture resin, the mass percentage of the coupling agent modified nano calcium carbonate is about 2% to about 3%, the mass percentage of the water-absorbent acrylic resin is about 3% to about 5%, the mass percentage of the TPU is about 92% to about 95%. The water-absorbent acrylic resin has a particle size in a range of about 5 μm to about 10 μm.
The waterproof portion 30 is formed on the base body 10 by insert molding using the mixture resin material. The waterproof portion 30 is formed on the inner wall 12 and the first end wall 14.
Spherically shaped nano silicon dioxides are ultrasonically dispersed in an organic solvent, and then thirteen fluorine octyltriethoxysilane (hearinafter “TFOT”) is added to make a mixture. The mixture is stirred for about 3 hours to about 5 hours, followed by a filtering process to separate out a fluoroalkyl-modified nano silicon dioxide. The fluoroalkyl-modified nano silicon dioxide has a low surface energy.
The ratio of the nano silicon dioxide, the organic solvent, and the TFOT is about 2 g to about 3 g of the nano silicon dioxide, the organic solvent may have a volume of about 30 ml to about 45 ml, and the TFOT may have a volume of about 0.1 ml to about 0.15 ml. The nano silicon dioxide has a particle size in a range of about 50 nm to about 120 nm.
The organic solvent can be, for example, isopropyl alcohol or ethanol, but not limited to the two substances. The organic solution acts as a diluent.
The fluoroalkyl-modified nano silicon dioxide, an organic solvent, and a filmogen are mixed uniformly to make a coating solution. The ratio of the fluoroalkyl-modified nano silicon dioxide, the organic solvent, and the filmogen is about 2 g to about 3 g of the fluoroalkyl-modified nano silicon dioxide, the filmogen has a mass of about 0.5 g to about 0.75 g, and the organic solvent has a volume of about 50 ml to about 75 ml.
The filmogen is benzenethionosulfonic acid sodium salt. The organic solvent can be, for example, isopropyl alcohol or ethanol, but not limited to the two substances. The organic solution acts as a diluent.
The coating solution is sprayed on the first surface 32 of the waterproof portion 30 using a spray gun, and then the substrate 11 is dried at an environment temperature of about 80° C. to about 120° C. for about 25 min to about 40 min to form a hydrophobic layer 50 on the first surface 32. The hydrophobic layer 50 has a thickness of about 150 nm to about 300 nm. The hydrophobic layer 50 contains fluoroalkyl-modified silicon dioxide.
Alternatively, fluoroalkyl-modified nano calcium carbonate can be used instead of the fluoroalkyl-modified silicon dioxide by using nano calcium carbonate instead of nano silicon dioxide.
A method for manufacturing the housing 100a is substantially same as the method for manufacturing the housing 100, except that the waterproof portion 30 is formed on the inner wall 12 and covered on partially surface of the first end wall 14.
During assembly, the housing 100 is mounted on the cover 120 to make the second surface 34 abutting against the second end wall 122. Then, the waterproof portion 30 having high elastic deformation capacity is pressed towards the housing 100 for reducing a gap defined therebetween, thus avoiding large quantity of water seepage into the receiving space 70 through the gap. Furthermore, the waterproof portion (30, 30a) will absorb the water entering the gap and expand to reduce the gap, which acts to prevent moisture from making contact with electronic components within the electronic device.
The waterproof portion (30, 30a) located between the housing (100, 100a) and the cover 120 provides an excellent water-resistance to the electrionic device 200a. Additionally, the hydrophobic layer 50 for enhancing the hydrophobic of the first surface 32 make water hardly get past the gap into the receiving space 70, thus further improves the water-resistance of the electrionic device (200, 200a).
It is to be understood, however, that even through numerous characteristics and advantages of the exemplary disclosure have been set forth in the foregoing description, together with details of the system and function of the disclosure, the disclosure is illustrative only, and changes may be made in detail, especially in the matters of shape, size, and arrangement of parts within the principles of the disclosure to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed.
Number | Date | Country | Kind |
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2012103433299 | Sep 2012 | CN | national |