FIELD: chemistry.
SUBSTANCE: present invention relates to polyurea compositions and methods of using polyurea compositions. Described sealant composition for the aerospace industry, which contains a polyformal-isocyanate prepolymer, which contains reaction products of reactants containing polyformal polyol and a first diisocyanate, and a curing agent containing an amine; wherein said polyformal polyol contains a polyformal polyol selected from a polyformal polyol of formula (4), a polyformal polyol of formula (5) and a combination thereof, where each w is independently selected from an integer from 1 to 50; z is an integer from 3 to 6; each R3 is independently C2-6alkanediyl; each R4 is independently selected from hydrogen, C1-6alkyl, C7-12phenylalkyl, substituted C7-12phenylalkyl, C6-12cycloalkylalkyl, substituted C6-12cycloalkylalkyl, C3-12cycloalkyl, substituted C3-12cycloalkyl, C6-12aryl and substituted C6-12aryl; and E is a nucleus of a z-valence initial polyol E(OH)z. Described
sealant composition for the aerospace industry which contains reaction products of reactants containing a polyformal-isocyanate prepolymer which contains products of reaction of polyformal polyol and a first aliphatic diisocyanate; a polythioether-isocyanate prepolymer containing products of reaction of polythioetherpolyol and a second aliphatic diisocyanate; and an aromatic diamine; wherein said polyformal polyol contains a polyformal polyol selected from a polyformal polyol of formula
a polyformal polyol of formula
and a combination thereof. The invention also describes openings sealed with said sealant containing said composition.
EFFECT: obtaining polyurea compositions for use as sealants, having improved properties, which are suitable for use as sealants for the aerospace industry.
19 cl, 1 dwg, 6 tbl, 17 ex
