FIELD: chemistry.
SUBSTANCE: invention relates to compositions of UV-curable sealants. Sealant composition for smoothing a surface defect is described, comprising: (i) polythioether having terminal thiol groups, comprising a terminal thiol group, polythioether of formula (II), polythioether of formula (III), or combination thereof: HS-R1-[-S-(CH2)2-O-[-R2-O-]m-(CH2)2-S-R1-]n-SH (II); B-(A-[R3]y-SH)z (III), where (1) each R1 independently is C2-10 n-alkanediyl group, C2-6 branched alkanediyl group, C6-8 cycloalkanediyl group, C6-10 alkanecycloalkanediyl group, -[(-CH2-)p-X-]q-(-CH2-)r- or -[(-CH2-)p-X-]q-(-CH2-)r-, where at least one -CH2- is substituted by a methyl group, wherein: (i) each X is independently selected from O, S and -NR6-, where R6 represents a hydrogen atom or methyl; (ii) p is an integer having a value in the range of from 2 to 6; (iii) q is an integer having a value in the range of 0 to 5; and (iv) r is an integer having a value in the range of from 2 to 10; (2) each R2 independently is C2-10 n-alkanediyl group, C2-6 branched alkanediyl group, C6-8 cycloalkanediyl group, C6-10 alkanecycloalkanediyl group or -[(-CH2-)p-X-]q-(-CH2-)r-, where: (i) each X is independently selected from O, S and -NR6-, where R6 represents a hydrogen atom or methyl; (ii) p is an integer having a value in the range of from 2 to 6; (iii) q is an integer having a value in the range of 0 to 5; and (iv) r is an integer having a value in the range of from 2 to 10; (3) m is a rational number in the range from 0 to 10; and (4) n is an integer having a value in the range of 1 to 60; (5) A stands for a structure described by the formula: -R1-[-S-(CH2)2-O-[-R2-O-]m-(CH2)2-S-R1-]n-, in which (I) each R1 independently is C2-10 n-alkanediyl group, C2-6 branched alkanediyl group, C6-8 cycloalkanediyl group, C6-10 alkanecycloalkanediyl group, -[(-CH2-)p-X-]q-(-CH2-)r- or -[(-CH2-)p-X-]q-(-CH2-)r-, where at least one -CH2- is substituted by a methyl group, wherein: (i) each X is independently selected from O, S and -NR6-, where R6 represents a hydrogen atom or methyl; (ii) p is an integer having a value in the range of from 2 to 6; (iii) q is an integer having a value in the range of 0 to 5; and (iv) r is an integer having a value in the range of from 2 to 10; (II) each R2 independently is C2-10 n-alkanediyl group, C2-6 branched alkanediyl group, C6-8 cycloalkanediyl group, C6-10 alkanecycloalkanediyl group or -[(-CH2-)p-X-]q-(-CH2-)r-, where: (i) each X is independently selected from O, S and -NR6-, where R6 represents a hydrogen atom or methyl; (ii) p is an integer having a value in the range of from 2 to 6; (iii) q is an integer having a value in the range of 0 to 5; and (iv) r is an integer having a value in the range of from 2 to 10; (III) m is a rational number in the range of 0 to 10; and (IV) n is an integer having a value in the range of from 1 to 60; (6) y is 0 or 1; (7) R3 means a single bond, when y = 0, and -S-(CH2)2-[-O-R2-]m-O-, where y = 1; (8) z is an integer ranging from 3 to 6; and (9) B is the z-valent residue of the polyfunctionalizing agent; (ii) a compound containing terminal alkenyl groups comprising a polyvinyl ether and/or a polyallyl compound; and (iii) from 1 to 60 % by weight a filler that is capable of transmitting UV radiation, wherein the weight percent is based on the total weight of the sealant composition; sealant composition at least partially transmits ultraviolet radiation and is ultraviolet curable. Method for equalizing a defect on a surface, an aerospace or aerial vehicle surface aligned using the method is also described.
EFFECT: composition of an aerosol sealant with high performance characteristics is proposed.
20 cl, 8 dwg, 8 tbl, 18 ex
