Fast-curing one-component polyurethane sealant and preparation method thereof
A polyurethane sealant, fast curing technology, applied in the field of sealant, can solve problems such as incompatibility, achieve the effect of fast curing speed and fast surface drying
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[0022] The preparation method of terminal NCO group polyurethane prepolymer:
[0023] Take 85kg of polyether triol (average molecular weight 4500) and put it into a vacuum reactor, let the polyether triol dehydrate for 2 hours at 110°C in a vacuum environment, so that the moisture in the polyether triol is not more than 0.01%. Then lower the temperature in the vacuum reactor to 50°C, add 15kg of diphenylmethane diisocyanate, under the protection of nitrogen, stir evenly, heat to 82°C, let the polyether triol and diphenylmethane diisocyanate react for 4 hours, a terminal NCO-based polyurethane prepolymer was obtained.
[0024] The preparation method of terminal silyl group polyurethane prepolymer:
[0025] Put 102kg terminal NCO-based polyurethane prepolymer into the vacuum reactor and heat it to 50°C, add 34kgγ-aminopropyltrimethoxysilane under nitrogen protection and stir the reaction material to slowly rise to 70°C, after 1 hour of reaction, moderate Bubbling and mild exot...
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