Method of making polyurethane foam

摘要

Herein are disclosed an apparatus and method for reaction injection molding of polyurethane foam. In the method, a recirculation loop containing polyols along with an effective amount of water, and a recirculation loop containing isocyanates, are each partially evacuated.

主权项

1. A method of reaction injection molding a polyurethane foam, comprising:
recirculating a polyol mixture in a first partially evacuated recirculation loop,
wherein the polyol mixture comprises from about 0.5% to about 4% by weight of water; recirculating an isocyanate mixture in a second partially evacuated recirculation loop; impingement mixing a portion of the polyol mixture with a portion of the isocyanate mixture to form a reaction mixture; injecting the reaction mixture into a mold; and, allowing the reaction mixture to react to form a polyurethane foam.