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Silicone rubber composite material and preparation method thereof

A technology of composite materials and silicone rubber, which is applied in the field of silicone rubber composite materials and its preparation, can solve the problems of strength reduction, cumbersome preparation process, poor thermal crack resistance, etc., and achieve the effect of low smoke density

Active Publication Date: 2014-02-26
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] To sum up, the current existing fireproof silicone rubber sealants mainly have the following problems: the silicone rubber base resin is easily heated and deformed under flame burning at 1050-1100 ° C, and the strength decreases significantly after heating, and the resistance The thermal rupture performance is not good; and the smoke density and toxicity are high; the density is high, and the preparation process is cumbersome

Method used

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  • Silicone rubber composite material and preparation method thereof
  • Silicone rubber composite material and preparation method thereof
  • Silicone rubber composite material and preparation method thereof

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preparation example Construction

[0036] The B component of the silicone rubber matrix of the present invention contains novolac epoxy groups, utilizes the excellent bonding ability of the novolac epoxy groups and the characteristics of high carbon content, and improves the ablation resistance of the silicone resin; at the same time , the addition of phenolic resin improves the carbonization rate of the silicone rubber composite material, makes it better to form a carbonized layer, and plays the role of separating and absorbing heat. The specific preparation method includes the following:

[0037] Step 1: reacting the phenolic resin monomer with formaldehyde to obtain the first intermediate;

[0038] Step 2: reacting the first intermediate obtained in step 1 with epichlorohydrin to obtain a second intermediate;

[0039] Step 3: reacting the second intermediate obtained in Step 2 with a transition metal catalyst and organic silicone oil to obtain silicone rubber.

[0040] According to the present invention, fi...

Embodiment 1

[0059] Add 1 mol of m-cresol, 1 mol of formaldehyde and 80 ml of toluene into the reactor and stir evenly, heat up to 80°C and stir for 4 hours to obtain the first intermediate; cool the temperature in the reactor to room temperature and add 1 mol of epichlorohydrin and 0.01 mol tetrabutylammonium bromide, stirred at room temperature for 2h, heated to 70°C and stirred for 2h to obtain the second intermediate; the temperature in the reactor was cooled to room temperature, and 0.003mol dibutyltin dilaurate and 50% hydrogen Add potassium oxide aqueous solution into the reaction kettle, continue to add 60ml of toluene, then gradually increase the temperature to 80°C, stir for 2 hours, take a sample for detection, stop heating after the viscosity reaches 120mPas, and distill under reduced pressure to remove toluene, water and volatile small molecules generated by the reaction to obtain the reaction solution; at 50°C, slowly add 1 mol of commercially available silicone oil into the r...

Embodiment 2

[0062] Add 1 mol of m-ethylphenol, 1 mol of formaldehyde and 80 ml of toluene into the reactor and stir evenly, heat up to 70°C and stir for 5 hours to obtain the first intermediate; cool the temperature in the reactor to room temperature and add 1 mol of epichlorohydrin and 0.01 mol of tetrabutylammonium bromide, stirred at room temperature for 2h, heated to 60°C and stirred for 3h to obtain the second intermediate; the temperature in the reactor was cooled to room temperature, and 0.005mol of dibutyltin dilaurate and 50% hydrogen Add potassium oxide aqueous solution into the reaction kettle, continue to add 60ml of toluene, then gradually increase the temperature to 70°C, stir for 3 hours and then take a sample for testing, stop heating after the viscosity reaches 120mPas, and distill under reduced pressure to remove toluene, water and volatile small molecules generated by the reaction to obtain the reaction Solution; at 40°C, slowly add 1 mol of commercially available silico...

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Abstract

The invention provides a silicone rubber composite material and a preparation method thereof and belongs to the field of silicone rubber composite materials. The silicone rubber composite material comprises, by weight, 100 parts of a silicone rubber base component A, 5 parts of a silicone rubber base component B, 5-10 parts of an anti-burning filling material, 5-10 parts of a fireproof heat-insulation filling material, 2-5 parts of a flame-retardant cooling filling material and 1-3 parts of a heat stabilizer. The silicone rubber base component A comprises silicone base resin, organosilicone oil, a binder and white carbon black. The silicone rubber base component B contains a phenolic epoxy group and through use of excellent adhesion and high carbon content of the phenolic epoxy group, burning resistance of the organosilicone resin is improved. Through use of the phenolic resin, a carbonization yield of the silicone rubber composite material is improved and a better carbonization layer is formed and has effects of isolation and heat absorption and thus a part at the back of the silicone rubber fireproofing sealing agent can be protected well.

Description

technical field [0001] The invention belongs to the field of silicone rubber composite materials, and in particular relates to a silicone rubber composite material and a preparation method thereof. Background technique [0002] Fire-resistant silicone rubber is currently the most widely used sealing material. In addition to requiring good flame-retardant properties of silicone rubber, higher requirements are also placed on the flame impact resistance of silicone rubber. It is required that the material will not be burned through under the impact of extremely high temperature flames, and can form a carbonized heat insulation layer to protect the back parts from being damaged due to the impact of strong heat. [0003] Because the traditional ablation-resistant silicone rubber can generally meet the technical requirements of short-term high temperature (that is, withstand 1300-3300°C within 3-250s), but when it is used as a thermal insulation coating for a firewall, the ablatio...

Claims

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Application Information

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IPC IPC(8): C08L83/04C08L87/00C08K13/02C08K3/36C08K5/06C08K3/22
Inventor 柳美华雷义民倪江南查安虎左非吉红岩
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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