| 摘要 |
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 Ris independently Calkanediyl; each Ris independently selected from hydrogen, Calkyl, Cphenylalkyl, substituted Cphenylalkyl, Ccycloalkylalkyl, substituted Ccycloalkylalkyl, Ccycloalkyl, substituted Ccycloalkyl, Caryl and substituted Caryl; and E is a nucleus of a z-valence initial polyol E(OH). Describedsealant 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 formulaa polyformal polyol of formulaand 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 |
