Self-curing silicone rubber composite material and preparation process thereof
A composite material, silicone rubber technology, applied in the direction of adhesives, film/sheet adhesives, films/sheets without carriers, etc., can solve the problems of poor plasticity and ductility, poor adhesion to substrates, and inability to repair , to achieve the effects of excellent plasticity, excellent weather resistance and aging resistance, and excellent ductility
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[0053] A kind of preparation method of self-curing silicone rubber composite material of the present invention, comprises the following steps:
[0054] S1. Put butyl rubber and polyisobutylene into the kneader and mix evenly, then add α,ω-dihydroxy polydimethylsiloxane and dimethyl silicone oil, and continue to mix evenly;
[0055]S2. Add flame retardant, reinforcing filler and colorant, continue mixing, after all the powder is mixed in, heat to 120-140°C, remove water in vacuum for 1-3h, and then keep kneading at 120°C for 2h in a vacuum state;
[0056] S3. Cool down to room temperature, add the mixed liquid of curing agent, crosslinking agent and catalyst, keep the temperature below 45°C, knead for 3-5 hours, and finally mix into a uniform rubber clay state;
[0057] S4. Vacuum pack the cement directly, or extrude the cement into sheets with a screw extruder, cover the upper and lower parts with a layer of release film, and then vacuum pack.
Embodiment 1
[0062] First, 100 parts of butyl rubber and 40 parts of polyisobutylene with a molecular weight of 250 are added into the kneader and mixed evenly. Then add 50 parts of α,ω-dihydroxy polydimethylsiloxane with a viscosity of 80000cst and 10 parts of dimethicone oil with a viscosity of 50cst, and continue to mix evenly. Then add 25 parts of aluminum hydroxide, 10 parts of fumed silica and 2 parts of colored carbon black, and continue mixing. After all the powders are mixed in, heat to 120°C, remove water under vacuum for 3 hours, and then keep kneading at 120°C for 4 hours under vacuum. Cool down to room temperature, and add a mixture of 2 parts of methyltriethoxysilane and 1 part of tetraisopropyl titanate into the kneader. Keep at 42°C, knead for 5 hours, and finally mix into a uniform rubber clay state. Use a screw extruder to extrude the cement into a 120*120*2mm sheet, cover the top and bottom with a layer of release film, and finally vacuum pack. The resulting sheet pro...
Embodiment 2
[0064] First, 80 parts of butyl rubber and 35 parts of polyisobutylene with a molecular weight of 250 are added into the kneader and mixed evenly. Then add 60 parts of α,ω-dihydroxy polydimethylsiloxane with a viscosity of 80000cst and 10 parts of simethicone oil with a viscosity of 50cst, and continue to mix evenly. Then add 30 parts of aluminum hydroxide, 15 parts of fumed white carbon black and 2 parts of colored carbon black, and continue mixing. After all the powders are mixed in, heat to 125°C, remove water in vacuum for 2 hours, and then keep kneading at 125°C for 3 hours in a vacuum state. Cool down to room temperature, and add a mixed liquid of 2 parts of methyltriethoxysilane and 1 part of tetraisopropyl titanate into the kneader. Keep at 35°C, knead for 4 hours, and finally mix into a uniform rubber clay state. Use a screw extruder to extrude the cement into a 120*120*2mm sheet, cover the top and bottom with a layer of release film, and finally vacuum pack. The r...
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