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Tracking-resistant silicone rubber and preparation method and application thereof

A technology of tracking resistance and silicone rubber, which is applied in the field of silicone rubber, can solve the problems of damage to the mechanical properties of silicone rubber, poor compatibility of silicone rubber, and the performance of tracking resistance of silicone rubber cannot meet the requirements of power systems.

Inactive Publication Date: 2021-01-22
FOSHAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with the development of science and technology, the current tracking resistance of silicone rubber can no longer meet the requirements of power systems.
And the existing preparation method still has deficiencies: the polarity of the inorganic anti-tracking agent is relatively large, and the compatibility with silicone rubber is poor, and usually needs a large amount of filling to achieve satisfactory results, which will seriously damage the mechanical properties of silicone rubber. performance; while organic anti-tracking agents are usually polar small molecules, which are easy to migrate and lose or be partially enriched in the silicone rubber matrix, which will affect the anti-tracking effect of silicone rubber

Method used

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  • Tracking-resistant silicone rubber and preparation method and application thereof
  • Tracking-resistant silicone rubber and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Example 1 Preparation of anti-tracking silicone rubber

[0024] 90 parts of methyl vinyl silicone rubber (molecular weight 560,000) of 0.07mol% vinyl content, 10 parts of methyl vinyl silicone rubber (molecular weight 600,000) of 3mol% vinyl content, 40 parts of fumed silica (compared to Surface area 360m 2 / g), 8 parts of hydroxyl silicone oil (hydroxyl content 6wt%) were mixed in a kneader, and kneaded at room temperature for 4h. Then heat to 150°C and continue kneading for 2h, then vacuum knead for 1h, and cool to room temperature to obtain a silicone rubber base rubber.

[0025] Add the above-mentioned base glue on the open mill by adding 1.5 parts of polysilazane, 0.8 parts of olefin siloxane complex of chloroplatinic acid (wherein, the mass ratio of platinum atoms in the total formula raw material of anti-tracking silicone rubber 10ppm) and 2 parts of dicumyl peroxide, after mixing evenly, go out the sheet. Vulcanize at 165°C for 15 minutes, and then vulcanize ...

Embodiment 2

[0027] Example 2 Preparation of anti-tracking silicone rubber

[0028] 90 parts of methyl vinyl silicone rubber (molecular weight 560,000) of 0.07mol% vinyl content, 10 parts of methyl vinyl silicone rubber (molecular weight 600,000) of 3mol% vinyl content, 40 parts of fumed silica (compared to Surface area 360m 2 / g), 8 parts of hydroxyl silicone oil (hydroxyl content 6wt%) were mixed in a kneader, and kneaded at room temperature for 4h. Then heat to 150°C and continue kneading for 2h, then vacuum knead for 1h, and cool to room temperature to obtain a silicone rubber base rubber.

[0029] Add the above-mentioned base glue on the open mill by adding 1.5 parts of polysilazane, 0.8 parts of olefin siloxane complex of chloroplatinic acid (wherein, the mass ratio of platinum atoms in the total formula raw material of anti-tracking silicone rubber 10ppm) and 2 parts of dicumyl peroxide, after mixing evenly, go out the sheet. Vulcanize at 165°C for 15 minutes, and then vulcanize ...

Embodiment 3

[0031] Example 3 Preparation of anti-tracking silicone rubber

[0032] 50 parts of 0.06 mol% vinyl content (molecular weight 600,000), 50 parts of methyl vinyl silicone rubber with 0.25 mol% vinyl content (molecular weight 600,000), 40 parts of fumed white carbon black (specific surface area 260m 2 / g), 6 parts of hydroxyl silicone oil (hydroxyl content 6wt%) and 0.6 parts of hydrogen-containing silicone oil (hydrogen content 1.2wt%) were mixed in a kneader, and kneaded at room temperature for 4h. Then heat to 150°C and continue kneading for 2h, then vacuum knead for 1h, and cool to room temperature to obtain a silicone rubber base rubber.

[0033] Add 2.2 parts of polysilazane and 0.2 parts of isopropanol solution of chloroplatinic acid to the above-mentioned base rubber on the open mill (wherein, the mass ratio of platinum atoms in the total formula raw material of anti-tracking silicone rubber is 10ppm) And 2 parts of dicumyl peroxide, after kneading evenly, go out sheet. ...

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Abstract

The invention belongs to the technical field of silicone rubber, and discloses a tracking-resistant silicone rubber, and a preparation method and application thereof, the tracking-resistant silicone rubber is mainly prepared from the following raw materials: polysilazane, a platinum complex, basic silicone rubber, white carbon black, silicone oil and a vulcanizing agent. According to the invention, a small amount of polysilazane and platinum complex is added, and the structural formula of polysilazane is as follows: (R1R2Si-NH) x (R3R4Si-NH) y, x and y are both integers of 0-300, and x and y are not 0 at the same time; R1, R2, R3 and R4 independently represent any one of H, CH3 and CmH2m + 1 respectively, and m is an integer between 1-7; and when the mass ratio of platinum atoms in the total formula raw materials is 5-15 ppm, the tracking resistance of the obtained silicone rubber finished product can reach 1A 4.5 grade, the system compatibility is good, the mechanical property is excellent, and the defect of poor mechanical property of the current tracking-resistant silicone rubber is overcome. The preparation method is simple, raw materials are easy to obtain, the application prospect is good, and thetracking-resistant silicone rubber is suitable for being applied to the field of high-voltage insulation.

Description

technical field [0001] The invention belongs to the technical field of silicone rubber, and in particular relates to a tracking-resistant silicone rubber and a preparation method and application thereof. Background technique [0002] Silicone rubber is a special rubber with Si atoms and O atoms alternately bonded to form the molecular main chain skeleton, and various organic groups as side groups. Because of its carbon chain structure different from ordinary rubber, silicone rubber has excellent high and low temperature resistance, weather resistance, electrical insulation, anti-mold, physiological inertia and tracking resistance. However, with the development of science and technology, the current tracking resistance of silicone rubber can no longer meet the requirements of power systems. And the existing preparation method still has deficiencies: the polarity of the inorganic anti-tracking agent is relatively large, and the compatibility with silicone rubber is poor, and ...

Claims

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Application Information

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IPC IPC(8): C08L83/07C08L83/04C08L83/16C08K7/26C08K5/14C08K5/00
CPCC08L83/04C08L2205/035C08L2205/025C08L2205/02C08L83/16C08K7/26C08K5/14C08K5/0091
Inventor 陈宛涓
Owner FOSHAN UNIVERSITY
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