Siloxane organic hybrid materials providing flexibility to epoxy-based coating compositions

摘要

Disclosed herein are epoxy-based compositions that include a polysiloxane flexibilizer and amino-functional alkoxysilane, which provides flexibility, hardness and gloss to such compositions and that are useful as coatings, adhesives, sealants and composites. Also disclosed are cured compositions and substrates coated with such epoxy-based compositions.

主权项

1. An epoxy-based composition comprising:
(a) an epoxide resin having at least one 1,2-epoxy group per molecule with an epoxide equivalent weight in the range of from 100 to 2000; (b) an amino-functional alkoxysilane; (c) a flexibilizer having the general Formula (I):wherein:
each occurrence of R1 is independently an alkyl group having from 1 to 6 carbon atoms, a phenyl group or an arenyl group having 7 to 12 carbon atoms; each occurrence of R2 is independently an alkyl group having from 1 to 6 carbon atoms; each occurrence of R3 is independently a phenyl group or an arenyl group having 7 to 12 carbon atoms; each X1 is independently a hydroxyl group, an alkoxy group having from 1 to 6 carbon atoms, or an alkoxy group having from 1 to 6 carbon atoms and at least one ether or ester functional group; each X2 is independently a hydroxyl group, an alkoxy group having from 1 to 6 carbon atoms, an alkoxy group having from 1 to 6 carbon atoms and at least one ether or ester functional group, or a group with the Formula (II): each occurrence of the subscripts a, m, n, p, x and y is independently an integer wherein a is 1 to 3; m is 0 to 500, n is 1 to 500, p is 0 to 10, x is 0 to 50, and y is 0 to 50 with the provisos that (i) the molar ratio of m to n is from 0 to 15, and (ii) the molar ratio of p to n is from 0 to 1; and (iii) the flexibilizer (c) has a silanol content or a SiX1 content of from 2 to 15 mole %, based upon the total number of silicon atoms; and (d) at least one curing catalyst.