HYDROLYSIS-STABLE POLYURETHANE FOR COATING ELEMENTS IN MARITIME APPLICATIONS

摘要

A process for producing a polyurethane-coated conduit element includes mixing a) a mixture of aromatic and aliphatic polyisocyanate with, b) at least one polymeric compound having at least two hydrogen atoms which are reactive toward isocyanate, c) at least one chain extender, d) a catalyst, and e) optionally at least one other auxiliary, additive, or both, to form a reaction mixture; applying the reaction mixture to a conduit element; and allowing the reaction mixture to react to form a polyurethane layer. The polyurethane-coating conduit element is suitable for maritime applications in the oil and gas industry, which polyurethane has improved hydrolysis stability at high temperatures and nevertheless satisfies the high mechanical demands in the oil and gas industry.

主权项

1. A process for producing a polyurethane-coated conduit element, the process comprising:
mixing
a) a mixture of aromatic and aliphatic polyisocyanate with,b) at least one polymeric compound having at least two hydrogen atoms which are reactive toward isocyanate,c) at least one chain extender,d) a catalyst, ande) optionally at least one other auxiliary, additive, or both,to form a reaction mixture;
applying the reaction mixture to a conduit element; and allowing the reaction mixture to react to form a polyurethane layer, wherein: a chain extender index KV of the polyisocyanate mixture a) and of the components b) to e) according to the formula (1):KV=M(aromat·isocyanate)·NCO(aromat·isocyanate)·56100M(chainextender)·OHN(chainextender)·4200·100,(1)is from 1 to 100;
M (aromat. isocyanate) represents a proportion by weight of aromatic isocyanate, in % by weight, based on a sum of the total weight of isocyanate and isocyanate-reactive compounds of the components b) to e); NCO (aromat. isocyanate) represents an NCO content of the aromatic isocyanate, in % by weight; and M (chain extender) represents a total weight of the at least one chain extender, in % by weight, based on the sum of the total weight of isocyanate and the isocyanate-reactive compounds in the components b) to e).