Two-component composition for producing flexible polyurethane gel coats

摘要

The invention relates to the use of a two-component composition comprising a polyol component and a polyisocyanate component, for producing flexible polyurethane gel coats for epoxy-resin and vinyl-ester resin composite materials.

主权项

1. An in-mold process for the production of a synthetic resin composite material with a flexible polyurethane gel coat, wherein the process comprises
(i) mixing a polyol component (A) and a polyisocyanate component (B) and at least partially curing the resultant mixture to form a gel coat material; (ii) introducing the gel coat material into a mold; and (iii) applying a synthetic resin that comprises at least one of an epoxy resin and a vinyl ester resin onto the gel coat material, the synthetic resin being not, or at least not completely cured at the time it is contacted with the gel coat material and the gel coat material being not completely cured at the time it is contacted with the synthetic resin; and wherein polyol component (A) is a mixture that comprises (A1) one or more low molecular weight polyols having a molecular weight of from 160 to 600 g/mol and from 5 to less than 20 mol of hydroxyl groups per kg of low molecular weight polyol(s); (A2) one or more higher molecular weight polyols having a functionality of ≧2 and less than 5 mol of hydroxyl groups per kg of higher molecular weight polyol(s); and (A3) one or more light resistant aromatic amines; polyisocyanate component (B) comprises one or more polyisocyanates.