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Selective-self-adhesive liquid silicone rubber and preparation method thereof

A liquid silicone rubber, selective technology, applied in the direction of adhesives, polymer adhesive additives, non-polymer adhesive additives, etc., can solve product defects, can not be demolded and other problems, achieve easy operation, easy industrialization, Simple preparation process

Active Publication Date: 2017-04-26
GUANGZHOU BAIYUN CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The mold used for injection molding of liquid silicone rubber is usually metal (such as stainless steel). Adding the above-mentioned tackifier will cause the liquid silicone rubber to be unable to be completely released from the mold when preparing the product, resulting in product defects.

Method used

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  • Selective-self-adhesive liquid silicone rubber and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A kind of selective self-adhesive liquid silicone rubber of the present embodiment, its preparation method comprises the following steps:

[0038] (1) Refining of the base material: 48 parts by weight of α,ω-divinylpolydimethylsiloxane with a viscosity of 5800mPa·s, 38 parts by weight of 2 Hydrophobic fumed silica per gram, 2.5 parts by weight of vinyl hydroxy silicone oil (4.5 wt% vinyl content, 8 wt% hydroxyl content) were kneaded below 80°C for 1.5 hours. Then, 52 parts by weight of α,ω-divinyl polydimethylsiloxane with a viscosity of 5800 mPa·s was added to the kneaded product, and kneading was continued for 1 hour below 80°C. After uniform dispersion, the temperature was raised to Vacuum kneading at 160° C. for 3 hours with a vacuum degree of 0.09 MPa to prepare a base material.

[0039] (2) Preparation of component A: take 99.1 parts by weight of the above-mentioned base material, add 0.24 parts by weight of a catalyst with a platinum metal content of 5000 ppm, a...

Embodiment 2

[0043] A kind of selective self-adhesive liquid silicone rubber of the present embodiment, its preparation method comprises the following steps:

[0044] (1) Refining of the base material: 30 parts by weight of α,ω-divinylpolydimethylsiloxane with a viscosity of 30000mPa·s, 20 parts by weight of 2 Hydrophobic fumed silica / g, 0.56 parts by weight of vinyl hydroxy silicone oil (vinyl content 2 wt%, hydroxyl content 3.6 wt%) were kneaded at 80° C. or lower for 1 hour. Then, add 70 parts by weight of α,ω-divinylpolydimethylsiloxane with a viscosity of 30000mPa·s to the kneaded product, continue kneading at below 80°C for 0.5 hours, and after uniform dispersion, the temperature is raised to Vacuum kneading at 170° C. for 3.6 hours with a vacuum degree of 0.095 MPa to prepare a base material.

[0045] (2) Preparation of component A: take 94.6 parts by weight of the above-mentioned base material, add 3.6 parts by weight of a catalyst with a platinum metal content of 500 ppm, and ful...

Embodiment 3

[0049] A kind of selective self-adhesive liquid silicone rubber of the present embodiment, its preparation method comprises the following steps:

[0050] (1) Refining of the base material: 72 parts by weight of α,ω-divinylpolydimethylsiloxane with a viscosity of 20000mPa·s, 48 ​​parts by weight of 2 Hydrophobic fumed silica / g, 8 parts by weight of vinyl hydroxy silicone oil (vinyl content is 2.5 wt%, hydroxyl content is 5.0 wt%) were kneaded below 80°C for 2 hours. Then, add 28 parts by weight of α,ω-divinylpolydimethylsiloxane with a viscosity of 30000mPa·s to the kneaded product, continue kneading at below 80°C for 0.8 hours, and after uniform dispersion, the temperature is raised to Vacuum kneading at 180° C. for 4.8 hours with a vacuum degree of 0.098 MPa to prepare a base material.

[0051] (2) Preparation of component A: Take 98 parts by weight of the above-mentioned base material, add 0.8 parts by weight of a catalyst with a platinum metal content of 2000 ppm, and stir...

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Abstract

The invention relates to selective-self-adhesive liquid silicone rubber and a preparation method thereof. The selective-self-adhesive liquid silicone rubber contains a component A and a component B, wherein the component A contains the ingredients in parts by weight: 94-99.8 parts of base material, 0.1-4 parts of catalyst and 0.1-2 parts of adhesion accelerant, the component B contains the ingredients in parts by weight: 83.94-97.98 parts of base material, 1-6 parts of epoxy group containing coupling agent, 1-10 parts of hydrogen containing silicone oil cross-linker and 0.02-0.06 part of cross-linking inhibitor, and the base material contains the ingredients in parts by weight: 100 parts of vinyl silicone oil, 20-40 parts of white carbon black and 0.5-10 parts of vinyl hydroxy silicone oil. The selective-self-adhesive liquid silicone rubber provided by the invention has selective adhesion to different substrates, has very good adhesion property to plastics such as PC, PBT and nylon and is free of adhesion to metals such as stainless steel and aluminum, thereby being very applicable to the injection molding of plastic insert products.

Description

technical field [0001] The invention relates to the technical field of liquid silicone rubber, in particular to a selective self-adhesive liquid silicone rubber and a preparation method thereof. Background technique [0002] Addition-type liquid silicone rubber has the characteristics of non-toxicity, good fluidity, small linear shrinkage, and rapid forming at high temperature. When processing it, liquid injection molding can be used. Liquid silicone rubber is accurately measured and continuously The feed enters the injection molding machine for vulcanization to produce the required silicone rubber products. Liquid silicone rubber injection molding process is simple, fast forming, high-quality products, widely used in automotive parts, electronic appliances, baby products, tableware and other fields. [0003] A significant disadvantage of addition-type liquid silicone rubber is that it has poor adhesion to most substrates. To improve its bonding performance with substrates,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J183/07C09J11/06C09J11/04C09J11/08
CPCC08K2201/014C08L2205/02C08L2205/025C08L2205/035C09J11/04C09J11/06C09J11/08C09J183/04C08L83/04C08L83/06C08K13/02C08K3/36C08K5/5435C08K5/0091
Inventor 陈精华石俊杰张健臻陈建军黄恒超冯朝波
Owner GUANGZHOU BAIYUN CHEM IND
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