One-component dealcoholized room temperature vulcanized silicone sealant and preparation method thereof
A vulcanized silicone and dealcoholization technology, applied in chemical instruments and methods, adhesives, other chemical processes, etc., can solve the problems of storage stability, insufficient adhesion and yellowing resistance, and achieve good economic and social benefits. , easy to use, low production cost
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Embodiment 1
[0037] A one-component dealcoholized room temperature vulcanizing silicone sealant, prepared by the following method:
[0038] (1) Put 100 parts of α, ω-dihydroxypolydimethylsiloxane with a viscosity of 20000mPa·s and 3 parts of tetramethoxysilane into a stirred tank, and stir at 25°C and a vacuum of -0.08MPa Evenly, the stirring speed is 1000rpm, then add 1.2 parts of dibutyl phosphate, stir in vacuum for 30 minutes, then add 0.96 parts of dibutylamine, continue to stir in vacuum for 70 minutes, that is polydimethylsiloxane end-capped by polyalkoxy groups;
[0039] (2) Add 100 parts of the polyalkoxy-terminated polydimethylsiloxane, 10 parts of dimethyl silicone oil, and 4 parts of methyltrimethoxysilane into the stirred tank, stir in a vacuum for 20 minutes, and add BET specific surface area 150m 2 10 parts of hydrophilic fumed silica per gram, evacuated and stirred at a high speed for 40min at a speed of 1200rpm, then added 1 part of N-β-(aminoethyl)-γ-aminopropyltrimethox...
Embodiment 2
[0041] A one-component dealcoholized room temperature vulcanizing silicone sealant, prepared by the following method:
[0042] (1) Put 100 parts of α,ω-dihydroxypolydimethylsiloxane with a viscosity of 80000mPa·s and 2 parts of tetramethoxysilane into a stirred tank, and stir at 25°C and a vacuum of -0.08MPa Evenly, the stirring speed is 1000rpm, then add 1 part of dibutyl phosphate, stir in vacuum for 30 minutes, then add 0.8 parts of dibutylamine, and continue to stir in vacuum for 70 minutes to obtain polydimethylsiloxane with polyalkoxy end-capping;
[0043] (2) Add 100 parts of the polyalkoxy-terminated polydimethylsiloxane and 4 parts of vinyltrimethoxysilane to the planetary mixer, vacuumize and stir for 20 minutes, add BET with a specific surface area of 150m 210 parts / g of hydrophobic fumed silica, vacuumed and stirred at high speed for 40 minutes, followed by adding 1 part of γ-aminopropyltrimethoxysilane, 0.5 parts of β-(3,4-epoxycyclohexane) ethyl trimethyl Oxys...
Embodiment 3
[0045] A one-component dealcoholized room temperature vulcanizing silicone sealant, prepared by the following method:
[0046] (1) Put 100 parts of α, ω-dihydroxy polydimethylsiloxane with a viscosity of 20000mPa·s and 2 parts of tetramethoxysilane into a stirring tank, and stir at 25°C and a vacuum of -0.08MPa Evenly, the stirring speed is 1000rpm, then add 1 part of bis(2-ethylhexyl) phosphate, stir in vacuum for 30 minutes, then add 0.8 parts of triethylamine, continue to stir in vacuum for 70 minutes, that is polydimethyl Silicone;
[0047] (2) Add 100 parts of the polyalkoxy-terminated polydimethylsiloxane and 3 parts of tetraethoxysilane to the planetary mixer, vacuumize and stir for 20 minutes, add BET with a specific surface area of 150m 2 10 parts / g of hydrophilic fumed silica, vacuumed and stirred at high speed for 40min, followed by adding 1 part of γ-aminopropyltriethoxysilane, 0.5 parts of N-β-(aminoethyl)-γ-aminopropyl Base trimethoxysilane, 0.3 parts of dibu...
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