Patent Application
20180195233
The disclosure relates to a technical field of synthetic leather, and more particularly to a scald-resistant synthetic leather and a preparing method thereof.
Nowadays, polyurethane (PU) and polyvinyl chloride (PVC) are primary in the synthetic leather industry around the world, which release a large amount of harmful substances such as dimethylformamide, butanone, methylbenzene and the like both in production and usage; recycling and processing the waste thereof will generates decomposed products such as hydrogen chloride, dioxin, hydrogen cyanide and the like to harm the environment and creatures.
PU and PVC synthetic leather further have shortcomings such as aging, temperature sensitiveness, easy hydrolyzation and contamination, etc.
Aiming at the problem above, the scald-resistant synthetic leather and a preparing method are provided. The synthetic leather can resist high temperature and scald, and the preparing method is environmentally friendly and harmless to human with the better performance.
A technical solution provided by the disclosure to solve the technical problem above is as follows.
A scald-resistant synthetic leather includes a silicone layer and a high-temperature resistant substrate disposed in sequence.
Preferably, a surface of the high-temperature resistant substrate facing away from the silicone layer is disposed with a silicone foam layer.
Preferably, the silicone layer, the high-temperature resistant substrate and the silicone foam layer are sequentially composite and connected together.
Preferably, the high-temperature resistant substrate is a glass fiber or a carbon fiber.
Preferably, a thickness of the silicone layer is 0.2-0.5 mm.
Preferably, the silicone layer is prepared by a silicone slurry, ingredients by weight of the silicone slurry are as follows: 45-70 vinyl polysiloxane, 1-10 polysiloxane containing hydrogen, 10-40 filler, 4-10 dyeing slurry, 0.01-1 platinum-group catalyst and 0.001-0.1 retarder.
The vinyl polysiloxane is a polysiloxane with at least two vinyl groups directly connected to silicon (Si), and the at least two vinyl groups are located at an end of a main chain or a branched chain.
The polysiloxane containing hydrogen is a polysiloxane with at least three hydrogen atoms directly connected to Si; the at least three hydrogen atoms are located at an end of a main chain or a branched chain of the polysiloxane containing hydrogen, or both ends of the main chain contain the at least three hydrogen atoms directly connected to Si; a mass ratio of the at least three hydrogen atoms in the polysiloxane containing hydrogen is 0.1˜1.6%; the polysiloxane containing hydrogen is one or a mixture with more of a linear chained polysiloxane, a branched polysiloxane and an annular polysiloxane.
The filler is one or a mixture with more of fumed silica, precipitated silica, silicone resin, silicon powders, calcium carbonate, aluminosilicate, diatomite, aluminum oxide, aluminum hydroxide, magnesium hydroxide and titanium dioxide.
The dyeing slurry is a dyestuff with polysiloxane as a disperse medium.
The platinum-group catalyst is one or a mixture with more of chloroplatinic acid isopropanol solution, chloroplatinic acid tetrahydrofuran solution, chloroplatinic acid-divinyl tetramethyl disiloxane coordination complex, and chloroplatinic acid-1,3,5,7-tetravinyl-1,3,5,7-tetramethyl-octamethylcyclotetrasiloxane coordination complex. A content of platinum (Pt) atoms in the platinum-group catalyst is 100˜500000 ppm.
The retarder is one or a mixture with more of methylbutynol, 1-ethynyl-1-cyclohexanol, maleic acid with an alkynyl group or derivatives thereof, fumaric acid with an alkynyl group or derivatives thereof, polyvinyl polysiloxane, pyridine, unsaturated amides, organic phosphine and sub phosphate ester.
A preparing method of the scald-resistant synthetic leather includes following steps: step 1, coating and vulcanizating a silicone slurry on release paper for more than one time; step 2, after coating the silicone slurry, attaching the high-temperature resistant substrate and the silicone slurry and sending the attached materials to a drying tunnel for vulcanization to allow fixation of the silicone layer and the high-temperature resistant substrate; step 3, after the vulcanization, peeling the silicone layer and the release paper apart to obtain the scald-resistant synthetic leather.
A thickness for a single coating is 0.02-3 mm; a total thickness for coating is 0.2-0.5 mm.
The preparing method further can include: coating the silicone slurry with 0.01-0.1 mm thick evenly on a silicone foam whose thickness is 0.1-5 mm, then attaching the high-temperature resistant substrate to the silicone foam by a surface with the silicone slurry, vulcanizating at 80-180° C. to compose and connect the high-temperature resistant substrate and a silicone foam layer.
The scald-resistant synthetic leather and a preparing method of the disclosure, compared with the prior art, have following advantageous effects.
The silicone slurry and the high-temperature resistant substrate used in the disclosure both are environmentally friendly and harmless materials. The high-temperature resistant substrate provides a fundamental framework, and the silicone slurry is the cover to enable the synthetic leather to own excellent scald resistance, as well as the inherent properties of silicone rubber products such as weathering resistance, contaminating resistance, hydrolyzing resistance, air permeability and the like.
1 is a silicone layer, 2 is a high-temperature resistant substrate, and 3 is a silicone foam layer.
The accompanying drawing unrestrictedly discloses a structural schematic view of a preferred embodiment of the disclosure, and the technical solution of the disclosure will be illustrated in detail with reference to the accompanying drawing as follows.
A scald-resistant synthetic leather, as shown in
The silicone layer 1 is prepared by the silicone slurry. The silicone layer includes following ingredients: vinyl polysiloxane, polysiloxane containing hydrogen, the filler, the dyeing slurry, the platinum-group catalyst, and the retarder.
The vinyl polysiloxane is the polysiloxane with at least two vinyl groups directly connected to silicon (Si), and the at least two vinyl groups are located at an end of a main chain or a branched chain. The embodiment adopts 600 grams vinyl polysiloxane whose viscosity is 5000 est.
The polysiloxane containing hydrogen is the polysiloxane with at least three hydrogen atoms directly connected to Si. The hydrogen atoms are located at a branched chain of an end of a main chain or the polysiloxane containing hydrogen, or both ends of the main chain contain the hydrogen atoms directly connected to Si. A content of the hydrogen atoms in the polysiloxane containing hydrogen is 0.1˜1.6%; the polysiloxane containing hydrogen is one or a mixture with more of a linear chained polysiloxane, a branched polysiloxane and an annular polysiloxane. The embodiment employs 20 grams polysiloxane containing hydrogen with 0.75% hydrogen.
The filler is one or more of fumed silica, precipitated silica, silicone resin, silicon powders, calcium carbonate, aluminosilicate, diatomite, aluminum oxide, aluminum hydroxide, magnesium hydroxide and titanium dioxide. The embodiment adopts 300 grams fumed silica whose specific surface area is 200 m2/g.
The dyeing slurry is an optional additive for producing the synthetic leather with various colors, which is a dyestuff with polysiloxane as a disperse medium, and optimally is polysiloxane containing vinyl groups as the disperse medium. The embodiment adopts 70 grams dyeing slurry.
The platinum-group catalyst is one or more of chloroplatinic acid isopropanol solution, chloroplatinic acid tetrahydrofuran solution, chloroplatinic acid-divinyl tetramethyl disiloxane coordination complex, chloroplatinic acid-1,3,5,7-tetravinyl-1,3,5,7-tetramethyl-octamethylcyclotetrasiloxane coordination complex. A content of Pt atoms in the platinum-group catalyst is 100˜500000 ppm. The embodiment adopts 3 grams chloroplatinic acid isopropanol solution whose Pt content is 3000 ppm.
The retarder is one or more of methylbutynol, 1-ethynyl-1-cyclohexanol, maleic acid with alkynyl groups or derivatives thereof, fumaric acid with alkynyl groups or derivatives thereof, polyvinyl polysiloxane, pyridine, unsaturated amides, organic phosphine and sub phosphate ester. The embodiment adopts 0.2 gram 1-ethynyl-1-cyclohexanol.
A preparing method of a scald-resistant synthetic leather includes following steps.
The silicone slurry is coated on the release paper for three times. A thickness of a first layer is 0.05 mm; the temperature of heating and vulcanization is 120° C., and the time for heating vulcanization is 5 minutes. Subsequently, a second layer is coated, and the thickness thereof is 0.1 mm; the temperature of heating and vulcanization is 120° C., and the time for heating vulcanization is 5 minutes. Then, a third layer whose thickness is 0.15 mm is coated. The glass fiber is evenly attached to the third layer for heating and vulcanizating at 120° C. for 10 minutes. The synthetic leather and the release paper can be separated to obtain the required synthetic leather. The release paper can be replaced by the release film.
The differences between the embodiment and the embodiment 1 are: as shown in
The differences in preparing methods are: coating the silicone slurry whose thickness is 0.1 mm evenly on the silicone foam whose thickness is 0.4 mm, attaching one surface of the glass fiber thereon, heating and vulcanizating at 120° C. for 10 minutes to obtain the required synthetic leather. In vulcanization, the temperature is 80-180° C.
The differences of the embodiment compared with embodiment 2 are: coating the silicone slurry on the release paper twice; the thickness of first coating is 0.05 mm, the temperature of heating and vulcanization is 120° C., and the time for heating and vulcanization is 5 minutes. Subsequently, a second layer whose thickness is 0.3 mm is coated, and the total thickness is 0.35 mm.
The differences of the embodiment compared with embodiment 2 are: coating the silicone slurry on the release paper twice; the thickness of first coating is 0.2 mm, the temperature of heating and vulcanization is 120° C., and the time for heating and vulcanization is 5 minutes. Subsequently, a second layer whose thickness is 0.3 mm is coated, and the total thickness is 0.5 mm.
The differences of the embodiment compared with embodiment 2 are: coating the silicone slurry on the release paper twice; the thickness of first coating is 0.02 mm, the temperature of heating and vulcanization is 120° C., and the time for heating and vulcanization is 5 minutes. Subsequently, a second layer whose thickness is 0.18 mm is coated, and the total thickness is 0.2 mm.
The differences between the embodiment and the embodiment 2 are ingredients by weight of the silicone slurry as follows: 450 grams vinyl polysiloxane, 10 grams polysiloxane containing hydrogen, 400 grams filler, 100 grams dyeing slurry, 10 grams platinum-group catalyst and 1 gram retarder.
The differences between the embodiment and the embodiment 2 are ingredients by weight of the silicone slurry as follows: 700 grams vinyl polysiloxane, 100 grains polysiloxane containing hydrogen, 100 grams filler, 40 grains dyeing slurry, 0.1 grams platinum-group catalyst (300000) and 0.01 gram retarder.
The difference between the embodiment and the embodiment 1 is: replacing the glass fiber with microfiber cloth whose thickness is 0.8 mm.
The difference between the embodiment and the embodiment 1 is: replacing the silicone slurry with PU slurry containing 25% solids.
The results of comparing properties of the synthetic leather obtained in embodiments 1-6 and the comparative examples 1 and 2 are shown in the following table.
The synthetic leather prepared by the method provided by the disclosure in the embodiments 1-7 have superior scald resistance, which can be adaptive for leather in daily application of home and the public.
The preferred embodiments illustrated with reference to the accompanying drawing above purely are for depicting the disclosure rather than limiting the objective of the disclosure or contents of the claims. Any simple modification and equivalents obtained according to the disclosure should be included in the protective scope of the disclosure.
| Number | Date | Country | Kind |
|---|---|---|---|
| 201610146739.2 | Mar 2016 | CN | national |
| Number | Date | Country | |
|---|---|---|---|
| Parent | PCT/CN2016/105894 | Nov 2016 | US |
| Child | 15917526 | US |
