(1) Silicone rubber Silicone rubber is the main material of adhesive, which mainly provides heat resistance and has certain adhesiveness after modification. There are methyl silicone rubber, methyl vinyl silicone rubber, phenyl silicone rubber, phenylene silicone rubber, phenylene ether silicone rubber, nitrile silicone rubber and fluorosilicone rubber.
(2) fillers are used to improve mechanical strength, heat resistance and adhesion. The fillers used are white carbon black, silicon dioxide, diatomite, titanium dioxide, metal oxides and so on. Among them, silicon dioxide is the most commonly used, and the dosage is 5-45 parts per 100 parts of rubber, with a maximum of 200 parts.
(3) tackifier, which is an important component to obtain adhesive properties. Organosilane, siloxane, silicate, titanate, boric acid or boron-containing compounds and silicone resin can be used, but these compounds are added to rubber compounds in the form of silica surface treatment agents and are rarely used alone.
(4) The curing agent mainly adopts peroxide, such as benzoyl tert-butyl peroxide, 25- dimethyl -25- di-tert-butyl peroxyhexane, dioctyl phthalate, ammonium carbonate, etc. , the dosage is 1~ 10.
When silicone rubber containing hydroxyl end groups is vulcanized and crosslinked at room temperature, catalysts are needed, mainly dibutyltin salt and tin octoate, and the general dosage is 0.5 ~ 2 phr.