Two-component addition type silicone rubber and its preparation method

A technology of addition type and silicone rubber, which is applied in the field of two-component addition type silicone rubber and its preparation, which can solve the problems of poor room temperature curing adhesiveness of silicone rubber, tackifier exudation colloidal performance, weak adhesive performance, etc. , to avoid the decline of colloid performance, high application value and high adhesion

Active Publication Date: 2020-11-03
GUANGZHOU BAIYUN CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the two-component condensation type silicone rubber has excellent adhesive performance, it will release small molecule by-products such as alcohols and acids during the preparation process, which will produce pungent odor and limit the application field; When curing, the bonding performance is weak, generally not suitable for the field of room temperature bonding
[0004] In order to solve the problem of poor adhesiveness of two-component addition type silicone rubber cured at room temperature, in the existing process, adding a tackifier to the raw material can improve its adhesive properties and obtain good results in some application fields. However, most of these tackifiers do not participate in the curing process, so the tackifier is easy to ooze out from the cured product and cause the performance of the colloid to decline.

Method used

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  • Two-component addition type silicone rubber and its preparation method
  • Two-component addition type silicone rubber and its preparation method
  • Two-component addition type silicone rubber and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] This embodiment provides a two-component addition type silicone rubber and its preparation method, the steps are as follows:

[0057] (1) Preparation of modified polydimethylsiloxane

[0058] In parts by weight, 100 parts of toluene, 60 parts of aminoalkyl silicone oil (viscosity at 25°C 400mPas, amine value 0.65mmol / g), 6 parts of hexamethylene diisocyanate were sequentially added to the reaction kettle, and the temperature was controlled to react at 30°C 1.0h, then add 10 parts of hydroxyethyl acrylate, and raise the temperature to 60°C for 6.0h, finally raise the temperature in the kettle to 100°C and lower the vacuum to below -0.09MPa, remove the low boilers in the system for 3h, Modified polydimethylsiloxane was obtained.

[0059] The reaction formula of above-mentioned preparation method is as follows:

[0060]

[0061] (2) Preparation of component A

[0062]In parts by weight, 30 parts of modified polydimethylsiloxane and 70 parts of vinyl polydimethylsilox...

Embodiment 2

[0067] This embodiment provides a two-component addition type silicone rubber and its preparation method, the steps are as follows:

[0068] (1) Preparation of modified polydimethylsiloxane

[0069] In parts by weight, add 120 parts of xylene, 80 parts of aminoalkyl silicone oil (viscosity at 25°C of 5000mPas, amine value of 0.15mmol / g), and 8 parts of isophorone diisocyanate into the reaction kettle in sequence, and control the temperature at 40°C React for 0.5h, then add 15 parts of hydroxypropyl acrylate, and increase the temperature to 70°C for 4.0h, finally raise the temperature in the kettle to 120°C and reduce the vacuum to below -0.09MPa, and remove the low boilers in the system for 2h , to obtain modified polydimethylsiloxane.

[0070] The reaction formula of the above-mentioned preparation method refers to Example 1.

[0071] (2) Preparation of component A

[0072] In parts by weight, 30 parts of modified polydimethylsiloxane and 70 parts of vinyl polydimethylsilo...

Embodiment 3

[0077] This embodiment provides a two-component addition type silicone rubber and its preparation method, the steps are as follows:

[0078] (1) Preparation of modified polydimethylsiloxane

[0079] In parts by weight, 113 parts of ethyl acetate, 65 parts of aminoalkyl silicone oil (viscosity at 25°C: 1000 mPas, amine value: 0.55 mmol / g), and 7 parts of diphenylmethane diisocyanate were sequentially added to the reaction kettle, and the temperature was controlled at 35 ℃ for 0.7h, then add 11 parts of hydroxyethyl acrylate, and raise the temperature to 65°C for 5.0h, finally raise the temperature in the kettle to 110°C and reduce the vacuum to below -0.09MPa to remove the low boilers in the system After 2.5h, modified polydimethylsiloxane was obtained.

[0080] The reaction formula of the above-mentioned preparation method refers to Example 1.

[0081] (2) Preparation of component A

[0082] In parts by weight, 31 parts of modified polydimethylsiloxane and 62 parts of vinyl...

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Abstract

The invention relates to bi-component addition type silicon rubber which comprises a component A and a component B, wherein the component A comprises the following raw materials in parts by weight: 30-40 parts of modified polydimethylsiloxane, 50-70 parts of vinyl polydimethylsiloxane, 120-180 parts of reinforcing packing A and 0.002-0.02 part of a catalyst; the component B comprises the followingraw materials in parts by weight: 100-120 parts of hydrogen-containing polydimethylsiloxane, 120-150 parts of reinforcing packing B and 0.001-0.01 part of an inhibitor. After being cured at a room temperature, the silicon rubber is excellent in adhesion property.

Description

technical field [0001] The invention relates to the field of organic silicon, in particular to a two-component addition type silicone rubber and a preparation method thereof. Background technique [0002] my country's organic silicon industry is developing rapidly, and the development of the liquid silicone rubber industry is advancing by leaps and bounds. It has been widely used in national economic fields such as electrical and electronic, mold injection molding, and building sealing. According to different ways of use, liquid silicone rubber can be divided into one-component and two-component liquid silicone rubber. One-component liquid silicone rubber has the characteristics of easy construction; two-component liquid silicone rubber has the characteristics of excellent storage performance and controllable curing rate. [0003] Two-component liquid silicone rubber can generally be divided into condensation type and addition type. Although the two-component condensation ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L83/08C08L83/07C08L83/05C08K3/26C08G77/388
CPCC08G77/388C08K2201/011C08L83/08C08L2205/025C08L2205/03C08L83/04C08K3/26
Inventor 戴飞亮陈何国陈思斌林树忠
Owner GUANGZHOU BAIYUN CHEM IND
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