Process for the production of back foamed internal parts for ref

Details Process for the production of back foamed internal parts for ref Process for the production of back foamed internal parts for ref

1991-04-17

1993-12-14

Kuhns, Allan R.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

264 465, 264 466, 264 468, 264 53, 264255, B29C 6722

Patent

active

052699862

ABSTRACT:
Refrigeration units having internal parts containing a rigid polyurethane foam formed without the use of perhalogenated fluoro-chlorohydrocarbons are produced by applying a coating to the internal walls of the part in which back-foaming will take place, pouring a foam forming reaction mixture into the cavity of the part in which the internal walls have been coated and allowing the foam to form and set. The coating applied to the internal walls of the part in which back foaming is to be carried out is selected from one-component chemically cross-linking lacquers, two-component chemically cross-linking lacquers and lacquers based on aqueous polyurethane dispersions. The foam forming mixture generally includes a polyisocyanate, a polyisocyanate-reactive compound and a blowing agent. The blowing agent must include a partially halogenated hydrocarbon having at least one carbon-hydrogen bond and a boiling point in the range of from about -50.degree. to about 50.degree. C.

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