High-temperature-resistant silicone rubber and preparation method and application thereof

A high-temperature-resistant silicone rubber and silicone rubber technology, which is applied in the field of silicone rubber, can solve the problems that the heat resistance of silicone rubber cannot meet the use requirements, the polarity of metal oxides is large, and the performance of silicone rubber has limited improvement in high-temperature resistance, so as to achieve good application Prospect, simple preparation method, and the effect of overcoming poor compatibility

Inactive Publication Date: 2021-02-19
FOSHAN UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, with the development of science and technology, especially in the field of aerospace, the heat resistance of silicone rubber can no longer meet the requirements of some special fields.
And the existing preparation method still has deficiencies: the polarity of the metal oxide is relatively large; the compatibility with silicone rubber is poor, and it is difficult to disperse; adding too much will lead to a serious decline in the elasticity and mechanical properties of silicone rubber; silicone resin and silicone rubber It has good compatibility, but it has limited improvement on the high temperature resistance of silicone rubber, and it also has a certain adverse effect on the mechanical properties such as hardness of silicone rubber.

Method used

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  • High-temperature-resistant silicone rubber and preparation method and application thereof
  • High-temperature-resistant silicone rubber and preparation method and application thereof

Examples

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Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1 prepares high temperature resistant silicone rubber

[0024] With 90 parts of methyl vinyl silicone rubber (molecular weight 560,000) of 0.06mol% vinyl content, 10 parts of methyl vinyl silicone rubber (molecular weight 600,000) of 1mol% vinyl content, 40 parts of fumed silica ( Specific surface area 260m 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 the base compound.

[0025] Add 6 parts of polysilazane and 0.6 parts of chloroplatinic acid olefin siloxane complex to the above-mentioned base glue on the open mill (wherein, the mass ratio of platinum atoms in the total formula raw material of high temperature resistant silicone rubber is 32ppm ) and 2 parts of 2,5-dimethyl-2,5-di-tert-butylperoxyhexane, mixed evenly and then released into tablets. Vulcanize at ...

Embodiment 2

[0027] Embodiment 2 prepares high temperature resistant silicone rubber

[0028] With 90 parts of methyl vinyl silicone rubber (molecular weight 500,000) of 0.06mol% vinyl content, 10 parts of methyl vinyl silicone rubber (molecular weight 600,000) of 1mol% vinyl content, 40 parts of fumed silica ( Specific surface area 260m 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 the base compound.

[0029] Above-mentioned base rubber is added the isopropanol solution of 6 parts of polysilazane, 0.6 part of chloroplatinic acid (wherein, the mass ratio of platinum atom in the total formula raw material of high temperature resistant silicone rubber is 32ppm) and 2 parts 2,5-Dimethyl-2,5-di-tert-butylperoxyhexane, mixed evenly and then released into tablets. Vulcanize at 165°C for 15 minutes, ...

Embodiment 3

[0031] Embodiment 3 prepares high temperature resistant silicone rubber

[0032] 50 parts of 0.07mol% vinyl content (molecular weight 560,000), 50 parts of methyl vinyl silicone rubber with 0.25mol% 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%) were mixed in a kneader, and kneaded for 4 hours at room temperature. Then heat to 150°C and continue kneading for 2h, then vacuum knead for 1h, and cool to room temperature to obtain the base compound.

[0033] The above-mentioned base rubber is added 6 parts of polysilazanes, 0.6 parts of tetramethyldisiloxane complexes of chloroplatinic acid on the open mill (wherein, the mass of platinum atoms in the total formula raw materials of high temperature resistant silicone rubber accounts for The ratio is 32ppm) and 2 parts of 2,5-dimethyl-2,5-di-tert-butylperoxyhexane, mixed evenly and then released into tablets. Vu...

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Abstract

The invention belongs to the technical field of silicone rubber and discloses high-temperature-resistant silicone rubber and a preparation method and application thereof. The high-temperature-resistant silicone rubber is mainly composed of polysilazane, a platinum complex, basic silicone rubber, white carbon black, silicone oil and a vulcanizing agent. The inventor finds that when the molecular weight of the polysilazane is 600-9000 and the mass proportion of platinum atoms in the platinum complex in the total formula raw materials of the high-temperature-resistant silicone rubber is 15.01-50ppm, the residual mass of a high-temperature-resistant silicone rubber product at a high temperature (800 DEG C) can be remarkably improved; and the polysilazane and the platinum complex are added asheat-resistant additives, so that the defect of poor compatibility between the common heat-resistant additives and the high-temperature-resistant silicone rubber is overcome, and the original mechanical properties of the silicone rubber are maintained. The preparation method is simple, raw materials are easy to obtain, and the silicone rubber has a good application prospect and is suitable for theaerospace field.

Description

technical field [0001] The invention belongs to the technical field of silicone rubber, and in particular relates to a high-temperature-resistant silicone rubber and its preparation method and application. 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 temperature resistance, low temperature resistance, weather resistance, electrical insulation, mold resistance and physiological inertia. Ordinary silicone rubber can generally be used for a long time and maintain elasticity in the temperature range of -50-260°C, while the heat-resistant temperature of phenyl silicone rubber can reach 300-350°C. At present, the heat resistance of silicone rubber is mainly improved by adding inorganic heat-resistant additives or silicone resin...

Claims

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Application Information

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IPC IPC(8): C08L83/07C08L83/16C08L83/04C08K7/26C08K5/00C08K5/14
CPCC08L83/04C08L2201/08C08L2205/03C08L2205/02C08L2205/025C08K2201/006C08L83/16C08K7/26C08K5/0091C08K5/14
Inventor 陈宛涓曾幸荣
Owner FOSHAN UNIVERSITY
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