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Expansible ceramic silicone rubber composite material and preparation method thereof

A technology of composite materials and silicone rubber, which is applied in the field of rubber materials, can solve the problems of low thermal stability, heat release rate, inability to meet the expansion seal, and no seal expansion, so as to increase the preparation reaction speed, improve the mechanical properties, reduce the ceramic The effect of temperature

Inactive Publication Date: 2018-03-06
CHINESE PEOPLES ARMED POLICE FORCE ACAD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional fireproof sealing materials have low fireproof efficiency, low vitrification rate and poor sealing effect
Silicone rubber has the advantages of high thermal stability, low heat release rate, high char formation rate, non-toxicity, high and low temperature resistance, and aging resistance. It is suitable for use as a flame-retardant sealing material for wires and cables; And there is basically no seal expansion, which limits its application in the field of flame retardancy to a certain extent
[0004] To sum up, the existing silicone rubber has low strength when degraded at high temperature and cannot meet the needs of expansion sealing. Therefore, the exploration of expandable porcelain silicone rubber composite materials has gradually become the focus of research in the industry.

Method used

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  • Expansible ceramic silicone rubber composite material and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A kind of preparation method of expansion porcelain silicon rubber composite material of the present invention, comprises the following steps:

[0027] 1) Mix 100g of methyl vinyl silicone rubber raw rubber, 20g of porcelain filler, and 30g of reinforcing filler in a twin-roller mixer for 10 minutes, mix well, and the molecular weight of the methyl vinyl silicone rubber raw rubber is greater than 500,000, the porcelain filler is made of mica, and the reinforcing filler is calcium carbonate. The above 20g porcelain filler is dried in an oven at 80°C for 7 hours to ensure that the porcelain material is fully dried and the prepared porcelain silicone rubber has good physical and chemical properties. properties, especially mechanical and electrical properties;

[0028] 2) Add 2g of vulcanizing agent to the above mixture to obtain mixed rubber, and the sheet is produced. The above vulcanizing agent is selected from 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane (commonly known...

Embodiment 2

[0031] 1) Blend 100g of methyl vinyl silicone rubber raw rubber with 18g of porcelain filler, 10g of flux, and 25g of reinforcing filler in an internal mixer for 10 minutes, and mix evenly. The molecular weight is greater than 500,000, kaolin is used as the porcelain filler, the flux is a mixture of glass powder with a melting point of 500°C and glass powder with a melting point of 400°C in a ratio of 1:1, and white carbon black is used as a reinforcing filler;

[0032] 2) Add 2g of methyl silicone oil to the above-mentioned internal mixer and continue blending to form a uniformly mixed rubber;

[0033] 3) Add 2.5g of vulcanizing agent to the above-mentioned uniformly mixed rubber, and release the sheet. The above-mentioned vulcanizing agent is selected from 2,4-benzoyl dichloride oxide (commonly known as double 2,4);

[0034] 4) Vulcanize the mixed rubber obtained in the above 3) at 160°C and 12Mpa pressure for 12 minutes to make the required sample and perform a performance ...

Embodiment 3

[0036] 1) Mix 100g of methyl vinyl silicone rubber raw rubber, 10g of porcelain filler, 20g of flux, and 28g of reinforcing filler in a twin-roller mixer for 15 minutes, and mix well; the methyl vinyl silicone rubber raw The molecular weight of the glue is greater than 500,000. Aluminum hypophosphite is used as the porcelain filler. The flux is a mixture of glass powder with a melting point of 500°C and glass powder with a melting point of 400°C in a ratio of 1:1. The reinforcing filler is zinc oxide, The combination of titanium dioxide, the combination ratio is 1:1.

[0037] 2) Add 3g of methyl silicone oil into the mixer to continue blending;

[0038] 3) 3g of vulcanizing agent is added to the mixture obtained in the above step 2) to form a mixed rubber, and the sheet is produced; the above-mentioned vulcanizing agent is selected from dicumyl peroxide (commonly known as DCP);

[0039] 4) Vulcanize the mixed rubber obtained in the above 3) at 120°C and 16Mpa pressure for 13 ...

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Abstract

The invention discloses an expanded porcelain silicone rubber composite material and a preparation method thereof. The composite material comprises 100 parts of methyl vinyl silicone rubber raw rubber, 20-30 parts of reinforcing fillers, 10-20 parts of porcelain fillers, 0-8 parts of base silicone oil, 0-40 parts of flux filler, and 2-4 parts of vulcanizing agent, and the materials are in weight ratio. The expanded ceramic silicone rubber composite material has simple processing technology, the same performance as ordinary silicone rubber at room temperature, and is flexible and easy to install. Under the condition of external fire, the temperature rises to 100 ° C and starts to expand, and continues to heat up, forming a dense ceramic structure outside. , A fluffy and porous hard carbon layer is formed inside, which has expansion and sealing performance.

Description

technical field [0001] The invention relates to a rubber material, in particular to an expanded porcelain-ceramizable silicon rubber composite material and a preparation method thereof. Background technique [0002] Different from ordinary polymer materials decomposed into weak powder or gas when exposed to high temperature, ceramicable composite materials can be ceramicized under high temperature environment, and the formed ceramic structure can be self-supporting and even resist certain external erosion. Silicone rubber is a special kind of polymer with Si-O as the main chain, which has both inorganic and organic properties, because it has the structure of inorganic silicon-oxygen bonds and side chain organic groups (R), so it is an application Elastic polymer materials with a particularly wide range are not only used as special materials in military, aviation and other fields, but also in various industries of the national economy, such as chemical industry, machinery man...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/07C08L83/04C08K13/02C08K3/26C08K3/40C08K3/36C08K3/34C08K5/14C08K3/22
CPCC08L83/04C08K3/26C08K3/34C08K5/14C08K2003/2241C08K2003/2296C08K2003/265C08K2003/327C08K2201/014C08L2205/025C08K13/02C08K3/40C08K3/36C08K3/346C08K3/32C08K3/22
Inventor 李建华高维英刘颖杰王毅欣白宗英
Owner CHINESE PEOPLES ARMED POLICE FORCE ACAD
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