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Foamed silicone rubber and preparation method thereof

A technology of foamed silicone rubber and vinyl silicone rubber, which is applied in the field of foamed silicone rubber and its preparation, can solve the problems of difficult control of density and cell structure, damage to the mechanical properties of silicone rubber, and no foaming, etc., to achieve It is conducive to thermal decomposition, improving mechanical properties and compression set properties, and improving the effect of heat aging resistance

Inactive Publication Date: 2019-03-19
安徽旭川新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The current foaming process for producing foamed silicone rubber is due to the poor matching of the single component foaming agent and vulcanizing agent. As a result, the foaming rate is too fast, the silicone rubber cannot contain the gas, and the resulting cavity is too large to damage the silicon. The mechanical properties of the rubber, or the foaming rate is too slow, does not play the role of foaming. At the same time, there are problems such as poor stability of the material, density and cell structure that are not easy to control when using a one-stage vulcanization process.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A foamed silicone rubber, which contains the following components by weight: 60 parts of base rubber, 30 parts of reinforcing agent, 1.55 parts of vulcanizing agent, 1.25 parts of foaming agent, 0.2 part of auxiliary foaming agent, and 7.5 parts of auxiliary agent Parts, spray carbon black 0.5 parts, of which, the base rubber is composed of 110-3 type and GY-131 type vinyl silicone rubber with a mass ratio of 1:0.35, with vinyl silicone rubber containing different amounts of ethylene as the base rubber, The introduction of a small amount of ethylene is beneficial to improve the vulcanization activity, increase the selection range of organic peroxide vulcanizing agent, and improve the heat aging resistance, mechanical strength and compression set performance of the vulcanizate. Among them, the reinforcing agent is gas-phase white carbon. A mixture of black and carbon nanotubes with a mass ratio of 1:0.3. The added reinforcing agent increases the strength of the foamed sili...

Embodiment 2

[0026] This embodiment is the same as embodiment 1, except that there is a foamed silicone rubber in this embodiment. The foamed silicone rubber contains the following components by weight: 50 parts of base rubber, 25 parts of reinforcing agent, and 1.25 parts of vulcanizing agent. 0.3 parts of foaming agent, 0.1 part of auxiliary foaming agent, 3.5 parts of auxiliary agent, 0.3 parts of spray carbon black, among which the base rubber is made of 110-3 type and GY-131 type vinyl silicone rubber with a mass ratio of 1:0.1 Composition, reinforcing agent is carbon nanotube and nano Fe 2 O 3 Composition, and the mass ratio is 1:1, the vulcanizing agent is composed of DCP and BPO in the mass ratio of 1:0.8, the blowing agent is composed of blowing agent H and blowing agent BL-353, and the mass ratio is 1:0.5, freezing temperature It is minus 28℃, the secondary freezing temperature is minus 15℃, the first vulcanization temperature is 120℃, and the duration is 20 minutes, and the second...

Embodiment 3

[0029] This embodiment is the same as embodiment 1, except that in this embodiment, a foamed silicone rubber contains the following components by weight: 70 parts of base rubber, 35 parts of reinforcing agent, and 1.75 parts of vulcanizing agent. 1.55 parts of foaming agent, 0.35 parts of auxiliary foaming agent, 9.5 parts of auxiliary agent, 0.8 parts of spray carbon black, among which the base rubber is made of 110-3 and GY-131 vinyl silicone rubber with a mass ratio of 1:0.5 Composition, the reinforcing agent is composed of carbon nanotubes and nano graphite, and the mass ratio is 1:0.3, the vulcanizing agent is composed of DCP and BPO in the mass ratio of 1:1.5, and the blowing agent is blowing agent BL-353 and blowing agent OB Composition, and the mass ratio is 1:0.5-0.8, the auxiliary is diphenyl silicon glycol, the freezing temperature is minus 15°C, the second freezing temperature is minus 28°C, the first-stage vulcanization temperature is 135°C, and the duration is 35mi...

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Abstract

The invention discloses foamed silicone rubber and a preparation method thereof, and belongs to the technical field of silicone rubber materials. Vinyl silicone rubber containing different amounts ofethylene is taken as a base rubber, the introduction of a small amount of ethylene is beneficial to improving vulcanization activity, increasing the selection range of organic peroxide vulcanizing agents, improving the heat aging resistance, mechanical strength and compression permanent deformation performance of vulcanized rubber; and meanwhile, the foamed silicone rubber is prepared by adoptinga method combining freezing and two-stage vulcanization reaction, and the two-stage vulcanization reaction is beneficial to avoiding the occurrence of over-sulfur, thus improving the mechanical properties and compression permanent deformation properties of a foamed silicone rubber product. Combined with the freezing process, the foaming uniformity and mechanical properties of the prepared productare improved, and the tensile strength of the prepared foamed silicone rubber reaches 0.87 Mpa.

Description

Technical field [0001] The invention belongs to the technical field of silicone rubber materials, and specifically relates to a foamed silicone rubber and a preparation method thereof. Background technique [0002] Foamed silica gel, also known as silica gel foam, is a flexible and porous polymer elastomer that combines the characteristics of silica gel with the characteristics of foam materials made by foaming silicone rubber. Silicone foam not only maintains the excellent properties of silicone, such as non-toxic, high and low temperature resistance, insulation, and weather resistance, but also has the characteristics of light weight, sound absorption, and earthquake resistance. It is used as high performance such as damping, vibration reduction, sound insulation, and heat insulation. Materials are widely used in fields such as national defense, aerospace, transportation, electronics industry, construction and furniture. [0003] The current foaming process for the production of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/07C08K13/02C08K5/053C08K3/04C08K3/22C08K5/14C08J9/10
CPCC08J9/105C08J9/0023C08J9/0061C08J9/0066C08J9/0071C08J9/0095C08J9/107C08J2203/04C08J2203/18C08J2383/07C08J2483/07
Inventor 尹祝明
Owner 安徽旭川新材料科技有限公司
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