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Preparation method of low temperature resistant addition type room temperature vulcanized silicone rubber

A room temperature vulcanization and addition molding technology is used in the preparation of low temperature resistant addition type room temperature vulcanized silicone rubber, and in the field of room temperature vulcanized silicone rubber preparation. Performance, product stability effect

Active Publication Date: 2016-04-20
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above-mentioned low-temperature-resistant rubber has disadvantages such as high price or low-temperature resistance.

Method used

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  • Preparation method of low temperature resistant addition type room temperature vulcanized silicone rubber
  • Preparation method of low temperature resistant addition type room temperature vulcanized silicone rubber
  • Preparation method of low temperature resistant addition type room temperature vulcanized silicone rubber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The preparation method of low temperature resistant addition type room temperature vulcanized silicone rubber, the steps are as follows:

[0030] (1) Mix 200g octamethylcyclotetrasiloxane, 70g hexaethylcyclotrisiloxane, 0.87g 1,3,5,7-tetramethyl-1,3,5,7-tetravinylcyclotetrasiloxane Siloxane and 2.50g of 1,3-divinyl-1,1,3,3-tetramethyldisiloxane were added to the reactor and stirred, and the temperature was raised to 80°C, and 6g of potassium hydroxide silanol was added. Salt, heat up to 130 ℃, start polymerization, after 3 hours, heat up to 180 ℃, vacuumize for 1 hour under the condition of vacuum degree of 133-1330Pa to remove small molecular low boilers in the material, and obtain low temperature resistant addition type room temperature silicon sulfide The raw rubber rubber, the composition of the product is listed in Table 1, and the DSC curve of the low temperature-resistant addition type RTV silicone rubber raw rubber (the thermogram recorded during differential sc...

Embodiment 2

[0033] The preparation method of low temperature resistant addition type room temperature vulcanized silicone rubber, the steps are as follows:

[0034] (1) Mix 200g octamethylcyclotetrasiloxane, 70g hexaethylcyclotrisiloxane, 0.58g 1,3,5,7-tetramethyl-1,3,5,7-tetravinylcyclotetrasiloxane Siloxane and 0.83g of 1,3-divinyl-1,1,3,3-tetramethyldisiloxane were added to the reactor and stirred, and the temperature was raised to 80°C, and 6g of potassium hydroxide silanol was added. Salt, heat up to 130 ℃, start polymerization, after 3 hours, heat up to 180 ℃, vacuumize for 1 hour under the condition of vacuum degree of 133-1330Pa to remove small molecular low boilers in the material, and obtain low temperature resistant addition type room temperature silicon sulfide Raw rubber, the composition of the product is listed in Table 1.

[0035] (2) Add 10g of fumed silica (TS-530) and 20g of precipitated silica (S-600) to 100g of the low-temperature-resistant addition type RTV raw silic...

Embodiment 3

[0037] The preparation method of low temperature resistant addition type room temperature vulcanized silicone rubber, the steps are as follows:

[0038] (1) Mix 200g octamethylcyclotetrasiloxane, 70g hexaethylcyclotrisiloxane, 0.87g 1,3,5,7-tetramethyl-1,3,5,7-tetravinylcyclotetrasiloxane Siloxane and 0.83g of 1,3-divinyl-1,1,3,3-tetramethyldisiloxane were added to the reactor and stirred, and the temperature was raised to 80°C, and 6g of potassium hydroxide silanol was added. Salt, heat up to 130°C, start to polymerize, after 3 hours, heat up to 180°C, vacuumize for 1 hour under the condition of vacuum degree of 133-1330Pa to remove small molecular low boilers in the material, and obtain low temperature resistant addition type room temperature silicon sulfide Raw rubber, the composition of the product is listed in Table 1.

[0039](2) Add 10g of fumed silica (TS-530) and 20g of precipitated silica (S-600) to 100g of the low-temperature-resistant addition type RTV raw silicon...

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Abstract

The invention relates to a method for preparing low-temperature resisting addition type room-temperature vulcanized silicone rubber. The method comprises the following steps of: mixing octamethylcyclotetrasiloxane, hexaethylcyclotrisiloxane, 1,3,5,7-tetramethyl-1,3,5,7-tetravinylcyclotetrasiloxane and a vinyl end capping agent uniformly, heating the mixture to the temperature of 80-170 DEG C, and adding a catalyst to carry out polymerization reaction; after the polymerization reaction finishes, increasing the temperature to 180-200 DEG C, vacuumizing to remove small-molecule low-boiling-point substances to prepare the raw vulcanized silicone rubber; adding white carbon black into the raw vulcanized silicone rubber, mixing the white carbon black and the raw vulcanized silicone rubber uniformly, and curing the mixture for 1-7 days at the room temperature to obtain the low-temperature resisting addition type room-temperature vulcanized silicone rubber. The low-temperature resisting addition type room-temperature vulcanized silicone rubber prepared by adopting the method provided by the invention is convenient to use, is stable and has good low-temperature resistance, hardness, tensile strength and tear strength.

Description

technical field [0001] The invention relates to a preparation method of room temperature vulcanized silicone rubber, in particular to a preparation method of low temperature resistant addition type room temperature vulcanized silicone rubber, and belongs to the technical field of rubber production. Background technique [0002] With the progress of modern science and technology and the deepening of research fields, the performance requirements of rubber are becoming more and more demanding, especially in the aerospace field, during the orbital operation of the space station or spacecraft, the back side that is not irradiated by the sun is not irradiated by the sun. Appropriate temperature control measures are taken, but the minimum temperature can still reach -100 ℃ or even lower. Therefore, it is of great significance to study rubber materials that can work in an environment below -100 °C for a long time to ensure the high reliability and safety of spacecraft. [0003] At ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L83/07C08K3/36C08J3/24C08G77/20
Inventor 冯圣玉马德鹏程阳刘春泽张圣有
Owner SHANDONG UNIV
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