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Method for preparing silicone rubber foam material with low density and high opening rate

A technology of foam materials and silicone rubber, which is applied in the field of polymer processing, can solve the problems of compression deformation, compression strength, compression permanent deformation and compression stress relaxation, and achieve the effects of low cost, excellent performance and simple process

Inactive Publication Date: 2012-10-03
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the fast vulcanization speed of methyl vinyl silicone rubber, the foamed silicone rubber prepared by chemical foaming is mostly a closed-cell material, and the compression deformation, compression strength, compression set, and compression stress relaxation of the material are difficult to meet the requirements.

Method used

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  • Method for preparing silicone rubber foam material with low density and high opening rate
  • Method for preparing silicone rubber foam material with low density and high opening rate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Dimethyl silicone rubber 100kg, nano silicon dioxide 20kg, montmorillonite 5kg, wollastonite 10kg, dicumyl peroxide 1.5kg, diphenyl dihydroxysilane 2kg, azodicarbonamide 20kg, zinc oxide 1.5kg, 0.4kg of stearic acid and 0.4kg of zinc stearate are masticated with a double-roller open mill at a temperature of 30°C, and then foamed with a flat vulcanizer. The first stage of foaming temperature is 145°C. The second-stage foaming temperature is 160°C.

Embodiment 2

[0023] 100kg of methyl vinyl silicone rubber, 40kg of nano silicon dioxide, 5kg of zinc oxide whiskers, 0.3kg of benzoyl peroxide, 2,5-dimethyl-2,5-di-tert-butylperoxyhexane 1.8kg, hydroxy silicone oil 6kg, N, N--dinitrosopentamyltetramine 8kg, urea derivatives 2kg, stearic acid 0.8kg and zinc stearate 0.7kg were masticated with a double-roller open mill, The plasticizing temperature is 30°C, and then foaming is carried out with a flat vulcanizer, the first stage foaming temperature is 130°C, and the second stage foaming temperature is 175°C.

Embodiment 3

[0025] 100kg of methyl phenyl vinyl silicone rubber, 45kg of nano-silica, 5kg of montmorillonite, 5kg of zinc oxide whiskers, 2.3kkg of benzoyl peroxide, 0.5kg of dicumyl peroxide, and diphenylsilane 15kg of alcohol, 10kg of 4,4`-oxodiphenylsulfonyl hydrazide, 3kg of sodium bicarbonate, and 3kg of zinc oxide were masticated with a double-roller open mill at a temperature of 45°C, and then vulcanized with a flat vulcanizer. Foaming, and then use a flat vulcanizing machine for foaming, the temperature of the first stage of foaming is 115 ° C, and the temperature of the second stage of foaming is 165 ° C.

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Abstract

The invention discloses a method for preparing a silicone rubber foam material with low density and high opening rate, which is characterized by comprising the following steps of: adding 100 parts by weight of silicon rubber, 15-80 parts by weight of reinforcing agent, 2-15 parts by weight of structure control agent, 5-20 parts by weight of foaming agent, 1.5-3 parts by weight of foaming aid and 0.5-4 parts by weight of crosslinking agent into a double-roller open mill, and plastifying the mixture for 12 min at 30-65 DEG C to obtain a silicone rubber foam material; and chemically foaming the silicone rubber foam material in two stages by using a flat vulcanizing machine to prepare the silicone rubber foam material, wherein the foaming temperature of the first stage is 110-160 DEG C, the time is 5-8 min, the foaming temperature of the second stage is 160-200 DEG C, and the time is 10-15 min. The foam material has the advantages of low density and high opening rate and can be used as a shock-absorbing, insulating and sound-isolating material.

Description

technical field [0001] The invention relates to a preparation method of a silicon rubber foam material with low density and high porosity, belonging to the field of polymer processing. Background technique [0002] Heat vulcanized silicone rubber foam, in addition to the shock absorption, sound insulation, heat insulation, sealing and other functions of foam materials, also has special properties such as silicone rubber's unique high temperature resistance and high electrical insulation performance, and is widely used in the electronics industry and Space Technology [Lei Haijun, Wang Jinwen, Analysis on the Foaming Mechanism of Thermally Vulcanized Silicone Rubber Sponge, Elastomer, 2002, 12(1), 24-30.]. Among them, silicone rubber open-cell foam material [Liu Daolong, Liu Pengbo, Xu Wen, Preparation and mechanical properties of open-cell foam silicone rubber material, Plastic Industry, 2006, 34, 98-102.] has good sound absorption and The cushioning property has been paid m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L83/04C08L83/07C08J9/10C08J9/08
Inventor 卢灿辉范萍梁梅张新星
Owner SICHUAN UNIV