Process for insulating pipes using polyurethane rigid foams...

Details Process for insulating pipes using polyurethane rigid foams... Process for insulating pipes using polyurethane rigid foams...

B - Operations, Transporting

05

D

B05D 7/22 (2006.01) B29C 41/04 (2006.01) C08G 18/32 (2006.01) C08G 18/66 (2006.01) C08J 9/14 (2006.01) F16L 59/14 (2006.01)

Patent

CA 2142406

The invention relates to a process for insulating pipes by applying a rigid polyurethane foam as an insulating layer and optionally an external top coating by the rotational casting process. The rigid polyurethane foam is obtained by a) an aromatic polyisocyanate, b) an organic polyhydroxyl compound, c) an aliphatic, cycloaliphatic or aromatic polyamine and/or polyimine having a molecular weight of from 32 to 1,000 as the cross linking agent in the presence d) a blowing agent, and optionally in the presence of e) known auxiliary substances and additives and in the presence of f) one or more compounds having a molecular weight of from about 166 to about 1,000 and being of the general formula Image wherein n represents an integer between 2 and 9, preferably 2 and 3, R1 signifies hydrogen, a C1-C9 alkyl radical or a Image R2 signifies hydrogen, and R3 and R4 signify hydrogen or methyl.

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