Silicone rubber formulation classification and pre...

Silicone rubber formulation classification and precautions   In the production of silicone rubber , methyl vinyl silicone rubber is the largest output , the most widely used , general-purpose applications in addition to a large number of plastic material , the variety of special silicone rubber and has processing characteristics are also using it as the basis for processing complexes , such as high strength silicone rubber , low compression set silicone rubber, conductive silicone rubber, conductive silicone rubber and ease of operation without the secondary vulcanized silicone rubber, and silicone rubber particles . Figure - Silicone Rubber Different characteristics into the following categories:     1 Universal : The vinyl silicone rubber composition and reinforcing agents , vulcanizing machine belongs moderate mechanical properties , tensile strength 4.9 ~ 6.9MPa (5 ~ 7kgl/cm2), elongation : 200 ~ 300% , is the maximum amount of versatility largest class of compound.     2 High Strength ( high tear resistance ) : the use of phenyl vinyl silicone rubber or silicone rubber, low to high surface area carbon black or fumed silica after modification made ​​reinforcing agent , and adding a suitable and special additives, processing aids , such as integrated with the improvement measures to improve cross-linked structure ( produce concentrated crosslinked ) , improved tear strength.     3 temperature type : the use of low- vinyl phenyl silicone rubber or silicone rubber, heat-resistant additives , and the type of reinforcing agents appropriately selected , it can be a high temperature silicone rubber of 300 ~ 350 ℃ .     4 Low temperature : mainly low- phenyl silicone rubber, brittleness temperature up to -120 ℃, when you do not lose flexibility in -90 ℃.     5 low compression type : vinyl silicone rubber used to make vinyl specific organic peroxide vulcanizing agent .     Silicone rubber by vulcanization mechanism can be divided into three categories : organic peroxide initiators of radical crosslinking , polycondensation reaction type addition reaction type . Silicone rubber formulation attention:     A silicone rubber is saturation of raw rubber, usually without sulfur vulcanization , thermal curing, heat curing organic peroxide vulcanizing agent to do so , shall not contain raw rubber and peroxide decomposition products can play a role in the activity substances ( such as channel black , some organic accelerator and antioxidant , etc. ) , otherwise it will affect the cure .     2 silicone products in general use at high temperatures , the blending agent should be stable at high temperatures , for inorganic oxide is usually used to make a reinforcing agent .     3 silicone rubber in the role of trace amounts of acid and other chemical agents can lead to polar siloxane cleavage and rearrangement, resulting in reduced heat resistance of silicone rubber . Therefore, the choice must be considered with the agent when its acidity , peroxide cleavage product should also consider the pH to affect the performance of vulcanized rubber .     HTV silicone rubber vulcanizing agent : mainly organic peroxides, aliphatic azo compounds , inorganic compounds, and other high-energy rays . Ye Jie Technology Co., Ltd. welcome new and old customers and dealers to negotiate business and cooperation agency . Let us join hands to create brilliant. you can email us info@szrl.net.