FIELD: chemistry.
SUBSTANCE: prepolymer composition for making sealants and coatings contains polyurethane prepolymers with blocked terminal NCO groups in which 50-100% terminal NCO groups are blocked silane groups and the remaining terminal NCO groups are blocked alcohol groups, where said composition contains unreacted aromatic alcohol in amount of not more than 0-15 mol % in terms of content of terminal NCO groups in the prepolymer, where the aromatic alcohol is selected from a group comprising phenol, 3-methoxyphenol, 4-methoxyphenol, nonylphenol, meta-cresol, para-cresol, 4-chlorophenol, meta-hydroxybenzaldehyde, ortho-hydroxybenzaldehyde, para-hydroxybenzaldehyde, hydroquinone, 3-hydroxyacetophenone and 4-hydroxyacetophenone. The invention also relates to a sealant containing said prepolymer composition and a catalyst for increasing the rate of cross-linking prepolymers as part of said prepolymer composition in a moist atmosphere.
EFFECT: high resistance to weather, high temperature and UV radiation.
15 cl, 4 ex
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|---|---|---|---|
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|
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|
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|
RU2591699C2 |
