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
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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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