FIELD: chemistry.
SUBSTANCE: described curable sealing composition of aerospace applications, comprising: (a) from 40 wt % to 60 wt % of polythioether with the terminal thiol group; where polythioether with the terminal thiol group includes a structure of formula (1) -R1-[-S-(CH2)p-O-(R2-O)m-(CH2)2-S-R1-]n- (1), wherein each R1 independently comprises C2-10 alcandiil, C6-8 cycloalcandiil, C6-14 alcancycloalcandiil, C5-8 heterocycloalcandiil, or -(-CHR3-)s-X-]q-(-CHR3-)r-, where s is an integer from 2 to 6; q is an integer from 0 to 5; r is an integer from 2 to 10; each R3 independently comprises hydrogen or methyl; and each X is independently selected from -O-, -S - and -NR6-, where R6 is selected from hydrogen and methyl; each R2 independently comprises C1-10 alcandiil, C6-8 cycloalcandiil, C6-14 alcancycloalcandiil, or -[(-CHR3-)s-X-]q-(-CHR3-)r-, where s, q, r, R3, and X have the same significance as R1; m is an integer from 0 to 50; n is an integer from 1 to 60; and p is an integer from 2 to 6; (b) from 0.5 wt % to 20 wt % of microcapsules comprising a polymer shell and polyepoxy, suspended in a solvent, where the polymeric shell comprises polyoxymethylene urea, and polyepoxy comprises epoxy resin based on bisphenol A/epichlorohydrine; and (c) an amine catalyst, where the amine catalyst comprises 1,8-diazabicyclo-7-ene (DBU), 1,4-diazabicyclo[2,2,2]octane (DABCO), isophoronediamine (IPDA), and the primary amine of C6-10, or any combination of them; where the wt % refers to the total weight of solids of the curable composition. Also, the method is described of sealing the hole, including: (a) the application of the above-mentioned sealing composition on one or more surfaces bounding the hole, (b) the energy impact for the purpose of allocation of polyepoxy from the capsule. The hole sealed with the above composition is described.
EFFECT: production of curable compositions of a thiol-end polythioether having a long shelf life.
12 cl, 1 ex
