High-temperature-resistant silicone rubber material, and preparation method thereof

Abstract

The invention discloses a high-temperature-resistant silicone rubber material. The high-temperature-resistant silicone rubber material is prepared from, by weight, 100 parts of methyl vinyl silicone rubber, 30 to 50 parts of fumed silica, 3 to 7 parts of polyimide, 0.5 to 1.5 parts of modified aluminum nitride nanoparticle, 0. 5 to 1.0 part of zinc stearate, 2 to 5 parts of hexamethyldisilazane, 0.5 to 1.5 parts of methyl hydrogen silicone oil, and 1to 3 parts of a vulcanizing agent. The high-temperature-resistant silicone rubber material possesses good raw material mutual compatibility, highhardness, high mechanical strength, good performance after aging by hot air, and is suitable for long time working under high temperature conditions.

Description

technical field

[0001] The invention belongs to the technical field of polymer materials, and in particular relates to a high-temperature-resistant silicone rubber material and a preparation method thereof. Background technique

[0002] Silicone rubber is a special rubber with Si-O-Si as the main chain, which has excellent high and low temperature resistance, oil resistance, chemical resistance, weather resistance and electrical insulation properties. However, in a high temperature or combustion environment, the side methyl group in the silicone rubber is prone to oxidative degradation when heated to generate free radicals to trigger the degradation of the silicone rubber, resulting in poor high temperature resistance of the silicone rubber. With the wide application of silicone rubber in silicone rubber insulators in recent years, it is of great significance to improve the high temperature resistance of silicone rubber materials.

[0003] The Chinese patent with the notifi...

Examples

Embodiment 1

[0026] A high temperature resistant silicone rubber material, made of the following raw materials in parts by weight: 100 parts of methyl vinyl silicone rubber, 30 parts of fumed silica, 3 parts of polyimide, 0.5 parts of modified aluminum nitride nanoparticles 0.5 parts of zinc stearate, 2 parts of hexamethyldisilazane, 0.5 parts of methyl hydrogen silicone oil and 1 part of vulcanizing agent.

[0027] The molecular weight of the methyl vinyl silicone rubber is 450000-650000, and the vinyl content is 0.13-0.22%.

[0028] The vulcanizing agent is bis-penta vulcanizing agent.

[0029] The preparation method of the modified aluminum nitride nanoparticles comprises the following steps:

[0030] (1) Mix aluminum nitride nanoparticles, KH570 and absolute ethanol, stir for 5 hours, then add styrene and dibenzoyl peroxide, and react in a water bath at 80°C for 10 hours to obtain a mixed solution;

[0031] The weight ratio of the aluminum nitride nanoparticles, KH570, styrene, and d...

Embodiment 2

[0040] A high temperature resistant silicone rubber material, made of the following raw materials in parts by weight: 100 parts of methyl vinyl silicone rubber, 35 parts of fumed silica, 4 parts of polyimide, 0.6 parts of modified aluminum nitride nanoparticles 0.6 parts of zinc stearate, 2.5 parts of hexamethyldisilazane, 0.8 parts of methyl hydrogen silicone oil and 1.5 parts of vulcanizing agent.

[0041] The molecular weight of the methyl vinyl silicone rubber is 450000-650000, and the vinyl content is 0.13-0.22%.

[0042] The vulcanizing agent is bis-penta vulcanizing agent.

[0043] The preparation method of the modified aluminum nitride nanoparticles comprises the following steps:

[0044] (1) Mix aluminum nitride nanoparticles, KH570 and absolute ethanol, stir for 6 hours, then add styrene and dibenzoyl peroxide, and react in a water bath at 65°C for 12 hours to obtain a mixed solution;

[0045] The weight ratio of the aluminum nitride nanoparticles, KH570, styrene, ...

Embodiment 3

[0054] A high temperature resistant silicone rubber material, made of the following raw materials in parts by weight: 100 parts of methyl vinyl silicone rubber, 40 parts of fumed silica, 5 parts of polyimide, 0.8 parts of modified aluminum nitride nanoparticles 0.7 parts of zinc stearate, 3 parts of hexamethyldisilazane, 1.0 parts of methyl hydrogen silicone oil and 2 parts of vulcanizing agent.

[0055] The molecular weight of the methyl vinyl silicone rubber is 450000-650000, and the vinyl content is 0.13-0.22%.

[0056] The vulcanizing agent is bis-penta vulcanizing agent.

[0057] The preparation method of the modified aluminum nitride nanoparticles comprises the following steps:

[0058] (1) Mix aluminum nitride nanoparticles, KH570 and absolute ethanol, stir for 6 hours, then add styrene and dibenzoyl peroxide, and react in a water bath at 70°C for 10 hours to obtain a mixed solution;

[0059] The weight ratio of the aluminum nitride nanoparticles, KH570, styrene, and ...

technical field

[0001] The invention belongs to the technical field of polymer materials, and in particular relates to a high-temperature-resistant silicone rubber material and a preparation method thereof. Background technique

[0002] Silicone rubber is a special rubber with Si-O-Si as the main chain, which has excellent high and low temperature resistance, oil resistance, chemical resistance, weather resistance and electrical insulation properties. However, in a high temperature or combustion environment, the side methyl group in the silicone rubber is prone to oxidative degradation when heated to generate free radicals to trigger the degradation of the silicone rubber, resulting in poor high temperature resistance of the silicone rubber. With the wide application of silicone rubber in silicone rubber insulators in recent years, it is of great significance to improve the high temperature resistance of silicone rubber materials.

[0003] The Chinese patent with the notifi...

Examples

Embodiment 1

[0026] A high temperature resistant silicone rubber material, made of the following raw materials in parts by weight: 100 parts of methyl vinyl silicone rubber, 30 parts of fumed silica, 3 parts of polyimide, 0.5 parts of modified aluminum nitride nanoparticles 0.5 parts of zinc stearate, 2 parts of hexamethyldisilazane, 0.5 parts of methyl hydrogen silicone oil and 1 part of vulcanizing agent.

[0027] The molecular weight of the methyl vinyl silicone rubber is 450000-650000, and the vinyl content is 0.13-0.22%.

[0028] The vulcanizing agent is bis-penta vulcanizing agent.

[0029] The preparation method of the modified aluminum nitride nanoparticles comprises the following steps:

[0030] (1) Mix aluminum nitride nanoparticles, KH570 and absolute ethanol, stir for 5 hours, then add styrene and dibenzoyl peroxide, and react in a water bath at 80°C for 10 hours to obtain a mixed solution;

[0031] The weight ratio of the aluminum nitride nanoparticles, KH570, styrene, and d...

Embodiment 2

[0040] A high temperature resistant silicone rubber material, made of the following raw materials in parts by weight: 100 parts of methyl vinyl silicone rubber, 35 parts of fumed silica, 4 parts of polyimide, 0.6 parts of modified aluminum nitride nanoparticles 0.6 parts of zinc stearate, 2.5 parts of hexamethyldisilazane, 0.8 parts of methyl hydrogen silicone oil and 1.5 parts of vulcanizing agent.

[0041] The molecular weight of the methyl vinyl silicone rubber is 450000-650000, and the vinyl content is 0.13-0.22%.

[0042] The vulcanizing agent is bis-penta vulcanizing agent.

[0043] The preparation method of the modified aluminum nitride nanoparticles comprises the following steps:

[0044] (1) Mix aluminum nitride nanoparticles, KH570 and absolute ethanol, stir for 6 hours, then add styrene and dibenzoyl peroxide, and react in a water bath at 65°C for 12 hours to obtain a mixed solution;

[0045] The weight ratio of the aluminum nitride nanoparticles, KH570, styrene, ...

Embodiment 3

[0054] A high temperature resistant silicone rubber material, made of the following raw materials in parts by weight: 100 parts of methyl vinyl silicone rubber, 40 parts of fumed silica, 5 parts of polyimide, 0.8 parts of modified aluminum nitride nanoparticles 0.7 parts of zinc stearate, 3 parts of hexamethyldisilazane, 1.0 parts of methyl hydrogen silicone oil and 2 parts of vulcanizing agent.

[0055] The molecular weight of the methyl vinyl silicone rubber is 450000-650000, and the vinyl content is 0.13-0.22%.

[0056] The vulcanizing agent is bis-penta vulcanizing agent.

[0057] The preparation method of the modified aluminum nitride nanoparticles comprises the following steps:

[0058] (1) Mix aluminum nitride nanoparticles, KH570 and absolute ethanol, stir for 6 hours, then add styrene and dibenzoyl peroxide, and react in a water bath at 70°C for 10 hours to obtain a mixed solution;

[0059] The weight ratio of the aluminum nitride nanoparticles, KH570, styrene, and ...

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