Carbon black is an excellent reinforcing agent in silicone rubber processing, but in order to save energy and manufacture light colored silicone rubber products, light colored inorganic fillers such as kaolin and silica are widely used. Among them, silica accounts for about 15% of inorganic fillers, and 90% of silica is precipitated silica.
The use of silica in silicone rubber industry is not only to make white and light colored silicone rubber products, but also to make white and light colored silicone rubber products. More importantly, it is to improve the tear resistance, skid resistance, adhesion and other properties of silicone rubber products. However, compared with the traditional reinforcing agent carbon black, white carbon black has some disadvantages, such as high Mooney viscosity, difficult processing, low crosslinking density, low modulus of elongation, poor wear resistance and large permanent deformation. In order to improve the reinforcing property of silica in compound, silane coupling agent was added. Adding silane coupling agent into mineral filled elastomer has the following advantages:
In the process of processing, it can shorten the mixing time, reduce the viscosity, improve the extrusion process, and make the surface of the molded products more beautiful. In terms of improving the performance of the products, it can enhance the modulus of constant elongation, improve the tear strength, improve the tensile strength, reduce the compression deformation, reduce the swelling in the solvent, improve the wear resistance, reduce the generation of internal heat, improve the growth resistance of the cutting edge, extend the dynamic life, and stabilize the electric field It can also reduce the moisture content and curing time.
There are two functions of silane coupling agent in silica filled compound: one is to form "molecular bridge" between silica and silicone rubber. The second is the formation of multi current bonds in the silicone rubber molecules, which can prevent the vulcanization phenomenon caused by the disappearance of cross-linking bonds during over vulcanization.
KH-550 3-Aminopropyltriethoxysilane KH-792 N-(2-Aminoethyl-3-aminopropyl)trimethoxysil Si69 Bis - [γ-(triethoxysilyl) propyl] tetrasulfid Si75 Bis [γ-(triethoxysilyl) propyl] disulfide KH-151 Vingyltriethoxysilane KH-171 Vinyltrimethoxysilane KH-172 6-ethenyl-6-(2-methoxyethoxy)-2,5,7,10-tetraoxa-6-silaundecane