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Service > Silicone rubber

Silicone rubber

Silicone rubber is a kind of high molecular weight (generally 40 * 104 ~ 80 * 104g/mol) linear poly two organic siloxane, without curing (cross-linking) based on Polysiloxane called silicone rubber,adding reinforcing filler and other additives, with peroxide curing or crosslinking reaction, or by compression molding injection molding, and the high temperature vulcanized elastomer is the vulcanized rubber mesh structure, has been widely used in aerospace, electronic and electrical,household appliances, machinery, solar energy, high-speed railway, automobile, instrument, food,medical and health fields.

(a) silicone rubber

Silicone rubber mainly has two methyl silicone rubber, methyl vinyl silicone rubber, methyl phenylvinyl silicone rubber and silicone rubber three methyl propyl fluoride 4. At present, domestic rubberpolymerization production in two ways by batch method and continuous method, generally eightmethyl siloxane ring four (D4), two methyl siloxane hybrid ring body (DMC), methyl vinyl hybrid ring body (VMC) and vinyl end low viscosity silicone oil as raw material, using Me4NOH as catalyst,dehydration the ring opening polymerization, catalyst, destruction, removal of the vacuum low molecular materials process, namely silicone rubber.

1, two methyl silicone rubber (MQ)

Chemical structure with two methyl silicone oil, but a much higher degree of polymerization, is the earliest use of silicone rubber. Two methyl silicone rubber was semi solid, relative density was 0.98,refractive index of 1.4035. Because the silicon atom connected as inert methyl, the low activity of vulcanized rubber vulcanization, poor mechanical strength, compression permanent deformation ofhigh temperature, poor heat resistance, it is rarely used, basically be methyl vinyl silicone rubberreplaced.

2, methyl vinyl silicone rubber (VMQ)

The chemical structure of RMe2SiO (Me2SiO) n (MeViSiO) mSiMe2R (R, Me or Vi), raw MeViSiO chain generally accounted for only 0.05-0.5% (mol), the relative density, refractive index, and molar mass close to two methyl silicone rubber. But a small amount of vinyl has greatly improved the activity of curing, improve vulcanizate heat aging, mechanical strength and compressionperformance, has become the largest amount and the most representative of a class of silicone rubber.

3, methyl phenyl vinyl silicone rubber (silicone rubber, PVMQ)

Phenyl silicone rubber is part of methyl vinyl silicone rubber product is phenyl substituted after, the relative density and refractive index and refractive index on the phenyl content, increased with the increasing content of phenyl. The introduction of phenyl rubber, the mechanical strength ofvulcanized rubber, can improve the radiation resistance, heat resistance and flame retardant.

4, three fluorine methyl propyl silicone rubber (silicone rubber, FVMQ)

The strong polar Me introduced fluorine silicone rubber (CF3CH2CH2) in the SiO chain, which can effectively improve the oil resistance of vulcanized rubber and solvent resistance, and cold resistance and compression permanent deformation is better than that of ordinary fluorine rubber.

(two) mixed silicone rubber and rubber products

The mixing method of silicone rubber and similar general synthetic rubber, the basic formula is relatively simple. Adding silica in rubber, some varieties of functional fillers and additives in a kneading machine by mixing, mixing, filtering, park, obtain the silicon rubber, according to theapplication needs to be processed into tablets, plate, belt, etc., a circle of different shapes, different colors of the silicon rubber preform, after curing the formation of silicon rubber products; productioncan also be used for continuous extrusion and vulcanization process.

With different rubber, different technics, different curing methods can be processed into a generic type, high temperature resistance, low temperature resistance, high strength, high tear resistance,thermal conductivity, electrical conductivity, flame retardant and other different types of silicone rubber products.