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Low-oil-permeability high-strength addition-type silica gel and preparation method thereof

An addition-type, high-strength technology, applied in the field of silicone gel, can solve problems such as low elongation, easy oil leakage on the surface of the gel, and insufficient vulcanization degree, so as to improve strength and toughness, avoid brittle cracking, and improve tensile strength. The effect of elongation

Active Publication Date: 2019-03-08
GUANGZHOU BAIYUN CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The ultra-low hardness of silicone gel endows it with shock absorption and damping properties, but due to the low crosslinking density and insufficient vulcanization degree, it also brings problems of insufficient strength and toughness and easy oil leakage on the surface of the gel. It may lead to the cracking of the colloid, and the seepage of the oil will greatly reduce its dielectric properties and adhesion
In the currently published literature on addition-type silicone gel, silicone resin is usually added to make the silicone gel have good flexibility and strength at the same time, but the elongation is not high and the elasticity is not good.
CN10251677A discloses an addition-type silicone gel for potting precision electronic components, but it cannot guarantee that the silicone gel has good toughness and strength
CN103709988A discloses a silicone gel with good toughness and strength at the same time, but the elongation is not high and the elasticity is not good
CN104212185A discloses a kind of stable and non-oil-seeking addition type silicone gel, which reduces oil seepage by pretreatment of raw materials by falling film evaporator, single-end vinyl silicone oil instead of dimethyl silicone oil as plasticizer, but raw material processing The process is relatively complicated, and the relevant data of its oil leakage have not been disclosed

Method used

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  • Low-oil-permeability high-strength addition-type silica gel and preparation method thereof
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  • Low-oil-permeability high-strength addition-type silica gel and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] In this embodiment, a low-permeability high-strength addition-type silicone gel has the following raw material composition, n Si-H / n Si-Vi =1.87:

[0044] 100 parts vinyl silicone oil

Vinyl content 0.2%

5 parts single-ended vinyl silicone oil

Vinyl content 0.2%

26 parts hydrogen silicone oil H1

Viscosity 1000mPa·s, hydrogen content 0.05%

10 parts hydrogen silicone oil H2

Hydrogen content 0.015%

0.1 Inhibitor

1-ethynyl-1-cyclohexanol

3ppm catalyst

Chloroplatinic acid-divinyltetramethyldisiloxane complex

[0045] The preparation method of the above-mentioned low oil-permeable high-strength addition type silicone gel is as follows:

[0046] a. Add the vinyl silicone oil, single-end vinyl silicone oil, hydrogen-containing silicone oil H1, hydrogen-containing silicone oil H2, and inhibitors into a planetary mixer or a high-speed dispersing mixer and mix for 20 minutes;

[0047] b. Add the catalyst, va...

Embodiment 2

[0049] In this embodiment, a low-permeability high-strength addition-type silicone gel has the following raw material composition, n Si-H / n Si-Vi =1.93:

[0050] 100 parts vinyl silicone oil

Vinyl content 0.3%

10 parts single-ended vinyl silicone oil

Vinyl content 0.1%

16.5 parts hydrogen silicone oil H1

Viscosity 3000mPa·s, hydrogen content 0.12%

22 parts hydrogen silicone oil H2

Hydrogen content 0.01%

0.5 Inhibitor

3,5-Dimethyl-1-hexynyl-3-ol

8ppm catalyst

Chloroplatinic acid-divinyltetramethyldisiloxane complex

[0051] The preparation method of the above-mentioned low oil-permeable high-strength addition type silicone gel is as follows:

[0052]a. Add the vinyl silicone oil, single-end vinyl silicone oil, hydrogen-containing silicone oil H1, hydrogen-containing silicone oil H2, and inhibitors into a planetary mixer or a high-speed dispersing mixer and mix for 20 minutes;

[0053] b. Add the catalyst...

Embodiment 3

[0055] In this embodiment, a low-permeability high-strength addition-type silicone gel has the following raw material composition, n Si-H / n Si-Vi =1.76:

[0056]

[0057] The preparation method of the above-mentioned low oil-permeable high-strength addition type silicone gel is as follows:

[0058] a. Add the vinyl silicone oil, single-end vinyl silicone oil, hydrogen-containing silicone oil H1, hydrogen-containing silicone oil H2, and inhibitors into a planetary mixer or a high-speed dispersing mixer and mix for 20 minutes;

[0059] b. Add the catalyst, vacuumize and stir for 10 minutes to obtain the finished product.

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Abstract

The invention relates to low-oil-permeability high-strength addition-type silica gel and a preparation method thereof. The addition-type silica gel is prepared from the following raw material components in parts by weight: 100 parts of alpha,omega-vinyl polydimethylsiloxane, 5 to 15 parts of single-ended vinyl polydimethylsiloxane, 15 to 30 parts of polymethylhydrosiloxane H1, 10 to 25 parts of polymethylhydrosiloxane H2, 0.01 to 2 parts of inhibitor, and platinum catalyst containing 0.5 to 50 ppm of platinum by mass, wherein nSi-H / nSi-Vi is greater than 1 in the addition-type silica gel. Theaddition-type silica gel has not only higher tensile strength and elongation at break, but superior oil permeability resistance, and stable adhesive performance and dielectric property, and can meet the encapsulating protection requirements of high-end precise electronic parts and components.

Description

technical field [0001] The invention relates to a silicone gel, in particular to an addition-type silicone gel with low oil permeability and high strength and a preparation method thereof. Background technique [0002] Silicone gel, commonly known as jelly gel, the moles of the two active functional groups silanyl and vinyl groups that play a role in vulcanization in addition-type silicone gels are usually less than 1, that is, n Si-H / n Si-Vi ≤1, generally between 0.2-0.8, its cross-linking density is generally 1 / 2 to 1 / 10 of that of addition-type silicone rubber, and after vulcanization, it is a frozen material with coexistence of solid and liquid, except that it has the properties of general addition-type silicone rubber In addition, its own softness endows the material with low elastic modulus and low internal stress, and has self-healing properties. It can automatically heal after being cracked by external force. When used for device potting, it can not only prevent du...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/07C08L83/05C08K5/05C08K5/5425
CPCC08L83/04C08L2205/025C08L2205/035C08K5/05C08K5/5425
Inventor 刘光华杨敦黄文哲陈建军付子恩
Owner GUANGZHOU BAIYUN CHEM IND
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