One-component deoximation type room-temperature vulcanized silicone rubber sealant and preparation method thereof
A room temperature vulcanization, silicone rubber technology, used in adhesives, adhesive additives, non-polymer adhesive additives, etc., can solve the problems of high industrialization threshold, high cost, poor versatility, etc., achieve high strength retention rate, improve adhesion. The effect of good bonding performance and good water resistance
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[0030] Example 1:
[0031] Add 100 parts of α, ω-dihydroxy polydimethylsiloxane with a viscosity of 20,000 mPa.s and 2 parts of γ-aminopropyltrimethylsilane into the planetary stirring tank, heat it up to 80 ° C, at -0.09 Mix under ~-0.1MPa vacuum condition for 30min, cool down to below 40℃. Add 15 parts of dimethyl silicone oil with a viscosity of 500mpa.s, 80 parts of calcium carbonate, 10 parts of fumed silica, in N 2 Add 10 parts of vinyl tributyl ketoximinosilane and 0.3 part of dibutyltin dilaurate under the protection, and stir under -0.09~-0.1MPa vacuum condition until uniform without bubbles.
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[0032] Example 2:
[0033] Add 100 parts of α,ω-dihydroxypolydimethylsiloxane with a viscosity of 20000 mPa.s and 3 parts of γ-aminopropyltriethoxysilane into the planetary stirring kettle, heat it up to 60°C, and at- Mix for 120min under the vacuum condition of 0.09~-0.1MPa, cool down to below 40℃, add 15 parts of dimethyl silicone oil with a viscosity of 100mpa.s, 100 parts of calcium carbonate, 8 parts of fumed silica, in N 2Under protection, 4 parts of methyltributanone oximinosilane, 6 parts of vinyltributanone oximosilane, and 0.2 part of dibutyltin dilaurate were added, and the mixture was stirred under vacuum conditions of -0.09 to -0.1 MPa until it was homogeneous and free of bubbles.
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