PHOSPHINE-CATALYSED, MICHAEL ADDITION-CURABLE SULPHUR-CONTAINING POLYMER COMPOSITIONS

摘要

FIELD: chemistry.;SUBSTANCE: invention relates to phosphine-catalysed sealing compositions containing sulphur-containing prepolymers. Embodiments of sealing compositions are described, comprising: (a) a Michael acceptor-terminated sulphur-containing prepolymer; (b) a thiol-terminated sulphur-containing prepolymer, where the thiol-terminated polythioether prepolymer comprises a backbone with a structure of formula (6): –R¹–[–S–(CH₂)_p–O–(R²–O)_m–(CH₂)₂–S–R¹–]_n– (6), wherein each R¹ is independently selected from C_2-10 alkanediyl, C_6-8 cycloalkanediyl, C_6-10 alkanecycloalkanediyl, C_5-8 heterocycloalkanediyl and –[(–CHR³–)_s–X–]_q–(–CHR³–)_r–, s is an integer of 2–6; q is an integer of 1–5; r is an integer of 2–10; each R³ is independently selected from hydrogen and methyl; and each X is independently selected from -O-, -S-, -NH- and -N(-CH₃)-; each R² is independently selected from C_1-10 alkanediyl, C_6-8 cycloalkanediyl, C_6-14 alkanecycloalkanediyl and –[(–CHR³–)_s–X–]_q–(–CHR³–)_r–, where s, q, r, R³ and X have the values defined for R¹; m is an integer of 0–50; n is an integer of 1–60; p is an integer of 2–6; and (c) a phosphine catalyst. Cured sealant formed from the above composition is also described. Method for using the above composition is described, comprising applying the composition to a substrate and curing to produce a cured sealant. Aerospace device containing the above cured sealant is described.;EFFECT: obtaining a rapidly curing composition after activation, obtaining cured sealants having improved properties.;19 cl, 1 dwg, 5 ex