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Foam Rubber Sheet

Foam Rubber Sheet

Foam rubber sheet Silicone rubber is composed of silicon oxygen bond (Si-O) alternating its main chain, organic groups (such as methyl, ethyl, vinyl, phenyl, trifluoropropyl, etc.) Polyorganosiloxanes. Since the introduction of a small amount of vinyl in the silicone rubber macromolecule...

Foam rubber sheet

Silicone rubber is composed of silicon oxygen bond (Si-O) alternating its main chain, organic groups (such as methyl, ethyl, vinyl, phenyl, trifluoropropyl, etc.) Polyorganosiloxanes. Since the introduction of a small amount of vinyl in the silicone rubber macromolecule structure can greatly improve the vulcanization and processing properties of the silicone rubber, the silicone rubber currently used mostly contains vinyl groups. Methyl vinyl silicone rubber is the most common kind of silicone rubber, at home and abroad currently dominated silicone rubber products. Because of its special structure, silicone rubber has many excellent properties that other materials can not have at the same time, such as excellent high temperature and low temperature resistance, excellent oil resistance, solvent resistance, UV resistance, radiation resistance, good aging resistance, Excellent electrical insulation and chemical stability and physiological inertia.


Silicone rubber foam is made of silicone rubber foam after the preparation of porous polymer elastic material, also known as sponge silicone rubber, micro-porous silicone rubber. According to the cell structure, can be divided into closed-cell, open cell and mixed-hole foam silicone rubber. In general, open-cell foams have lower mechanical strength but better compressive stress relaxation properties, whereas closed-cell foam possesses better mechanical strength but less compressive stress relaxation properties. Mixed-hole foam performance is in between.


According to the preparation method, silicone rubber foam can be divided into room temperature vulcanized silicone rubber foam (RTV) and high temperature vulcanized silicone rubber foam (HTV). Room temperature vulcanized silicone rubber foam is usually hydroxy-terminated condensation of silicone rubber substrate, hydroxy silicone oil as a blowing agent,


Platinum complex as a catalyst, at room temperature foamed foam made of a porous sponge-like elastomer. Room temperature vulcanized silicone rubber foam for in-situ foam molding, filling, sealing, shock absorption and other functions; high-temperature vulcanized foam silicone rubber traditional preparation method is to contain particulate inorganic fillers silicone rubber, foaming agent and curing Mixed uniformly to obtain a rubber compound, and then vulcanized and foamed by heating to obtain a silicone rubber foam. High-temperature vulcanized foam silicone rubber can be molded into a foam sheet, cut after use, can also be extruded through continuous hot air vulcanized into various shapes of cross-section of silicone rubber foam.

Foam rubber sheet knowledge

Foam silicone rubber is based on the condensation of hydroxyl-terminated silicone raw rubber-based, hydroxyl hydrogen silicone oil as a blowing agent to vinyl platinum complex as a catalyst, at room temperature by curing foam Hole in the sponge-like elastomer. Hydrogen that occurs during the reaction causes the compound to foam during vulcanization. The amount of blowing agent hydroxyl hydrogen silicone oil will affect the reaction speed and foam structure. Excessive amount of foam will make the surface more openings to promote the curing speed; dosage hours, the volume expansion is small, the product density increases


In order to improve the quality of the foam but also add some other components, such as hydrogen silicone oil, the vulcanization process to produce more gas to improve the foam feel and reduce the density. Addition of diphenylsilanediol can not only control the structure of the foam, but also control the viscosity of the compound during storage. However, the amount can not be too much, otherwise it will affect the electrical properties of the foam. In order to improve the physical and mechanical properties of foam, transparent silicone rubber can also be added. Catalyst chloroplatinic acid vinyl complex dosage can not be too much, to facilitate the operation prevail, otherwise it will increase the viscosity is not conducive to operation. When the amount of catalyst is insufficient, vulcanization is incomplete, the surface of the foam is sticky, the elasticity is not good, the plasticity is soft and the strength is poor.


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