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Dealcoholized room temperature vulcanized silicone rubber and preparation method thereof

A room temperature vulcanization and silicone rubber technology, which is applied in the field of dealcoholization room temperature vulcanization silicone rubber and its preparation, can solve the problems of high energy consumption and high resistance, and achieve the effect of solving yellowing and simple production process

Inactive Publication Date: 2018-06-22
GOLOHO TECH CHANGZHOU CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the deficiencies of the prior art, the object of the present invention is to provide a dealcoholized room temperature vulcanized silicone rubber and a preparation method thereof, which will not cause a viscosity peak during the preparation of the vulcanized silicone rubber, and will not cause a rapid increase in the viscosity of the rubber compound. Thickness and the problems of high energy consumption and high resistance

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  • Dealcoholized room temperature vulcanized silicone rubber and preparation method thereof

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Effect test

Embodiment 1

[0023] A dealcoholized room temperature vulcanized silicone rubber, comprising the following components in parts by weight: 100 parts of α, ω-dihydroxy polydimethylsiloxane with a viscosity of 20 Pa·s, 15 parts of dimethyl silicone oil, 130 parts of calcium carbonate, 1.5 parts of a cocatalyst, 2.5 parts of a first crosslinking agent, 0.8 parts of a silane coupling agent, 3.0 parts of a second crosslinking agent, and 0.2 parts of a catalyst.

[0024] The preparation method of the above-mentioned dealcoholized room temperature vulcanized silicone rubber comprises the following steps:

[0025] Step 1: Add α, ω-dihydroxypolydimethylsiloxane, dimethyl silicone oil and reinforcing filler into a vacuum stirred tank, stir and dehydrate at 150°C at -0.095MPa for 3 hours, then cool down to below 40°C to obtain Base glue;

[0026] Step 2: Add the cocatalyst and the first crosslinking agent to the rubber base in sequence, vacuumize to above -0.095MPa, stir for 60min, then add the silane...

Embodiment 2

[0028] A dealcoholized room temperature vulcanized silicone rubber, comprising the following components in parts by weight: 100 parts of α, ω-dihydroxy polydimethylsiloxane with a viscosity of 20 Pa·s, 15 parts of dimethyl silicone oil, 130 parts of calcium carbonate, 2.5 parts of a first crosslinking agent, 0.8 parts of a silane coupling agent, 3.0 parts of a second crosslinking agent, and 0.2 parts of an organotin catalyst.

[0029] The preparation method of the above-mentioned dealcoholized room temperature vulcanized silicone rubber comprises the following steps:

[0030] Step 1: Add α,ω-dihydroxy polydimethylsiloxane, dimethyl silicone oil and reinforcing filler into a vacuum stirred tank, stir and dehydrate at 150°C at -0.095MPa for h, then cool down to below 40°C to obtain Base glue;

[0031] Step 2, add the first cross-linking agent to the rubber base in sequence, vacuumize to above -0.095MPa, stir for 60min, then add the silane coupling agent, the second cross-linkin...

Embodiment 3

[0033] A dealcoholized room temperature vulcanized silicone rubber, comprising the following components in parts by weight: 100 parts of α, ω-dihydroxy polydimethylsiloxane with a viscosity of 20 Pa·s, 15 parts of dimethyl silicone oil, 130 parts of calcium carbonate, 0.8 parts of a silane coupling agent, 3.0 parts of a second crosslinking agent, and 0.2 parts of an organotin catalyst.

[0034] The preparation method of the above-mentioned dealcoholized room temperature vulcanized silicone rubber comprises the following steps:

[0035] Step 1: Add α, ω-dihydroxypolydimethylsiloxane, dimethyl silicone oil and reinforcing filler into a vacuum stirred tank, stir and dehydrate at 150°C at -0.095MPa for 3 hours, then cool down to below 40°C to obtain Base glue;

[0036] Step 2, vacuumize to above -0.095MPa, add silane coupling agent, second crosslinking agent and catalyst in sequence, vacuumize to -0.095MPa, stir for 60min to get dealcoholized room temperature vulcanized silicone ...

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Abstract

The invention discloses dealcoholized room temperature vulcanized silicone rubber and a preparation method thereof. The vulcanized silicone rubber comprises the following components of: alpha,omega-dihydroxypolydimethylsiloxane, dimethicone, reinforcing filler, a cocatalyst, a first cross-linking agent, a silane coupling agent, a second cross-linking agent and a catalyst. The preparation method thereof comprises the steps of: adding the alpha,omega-dihydroxypolydimethylsiloxane, dimethicone and reinforcing filler into a vacuum stirring kettle, performing stirring for dehydration at 130-170 DEGC and (-0.09)-(-0.1) MPa for 2-4 hours, and performing cooling to obtain base rubber; and adding the cocatalyst and first cross-linking agent sequentially into the base rubber, performing vacuum pumping and even stirring, then adding the silane coupling agent, second cross-linking agent and catalyst sequentially, performing vacuum pumping to (-0.09)-(-0.1) MPa, and performing stirring to obtain the dealcoholized room temperature vulcanized silicone rubber. During preparation of the vulcanized silicone rubber by using the preparation method, no viscosity peaks are generated, and the problem ofhigh energy consumption caused by rapid thickening of rubber viscosity is solved.

Description

technical field [0001] The invention belongs to the technical field of silicone adhesive preparation, and in particular relates to a dealcoholized room temperature vulcanized silicone rubber and a preparation method thereof. Background technique [0002] Room temperature vulcanized silicone rubber is easy to use, and has good adhesive sealing properties for metal, glass, ceramics, etc., and because of its excellent ozone resistance, corona discharge resistance, oxygen atom resistance, insulation, waterproof, moisture-proof and sealing functions, especially Ideal coating, potting and molding material for electrical and electronic components. [0003] The traditional one-component dealcoholized room temperature vulcanized silicone rubber base rubber generally uses hydroxyl-terminated polydimethylsiloxane, polyalkoxysilane as a crosslinking agent, and titanate and its chelate as a catalyst. Then add coupling agent, reinforcing filler and so on to prepare. Another method for p...

Claims

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Application Information

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IPC IPC(8): C08L83/04C08K3/26C08K5/54C08K5/5419C08K5/5425
CPCC08K2003/265C08L83/04C08L2205/025C08L2312/08C08K3/26C08K5/54C08K5/5419C08K5/5425
Inventor 揭志强朱凯
Owner GOLOHO TECH CHANGZHOU CO LTD
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