Amine catalysts for polyurethane foams

摘要

The invention provides polyurethane and polyisocyanurate foams and methods for the preparation thereof. More particularly, the invention relates to open-celled, polyurethane and polyisocyanurate foams and methods for their preparation. The foams are characterized by a fine uniform cell structure and little or no foam collapse. The foams are produced with a polyol premix composition which comprises a combination of a hydrohaloolefin blowing agent, a polyol, a silicone surfactant, and a sterically hindered amine catalyst.

主权项

1. A polyol premix composition which comprises a combination of from about 1 wt. % to about 30 wt. % of a blowing agent, from about 60 wt % to about 95 wt % of a polyol, from about 0.5 wt % to about 5 wt % of a silicone surfactant, and a sterically hindered amine catalyst; wherein the blowing agent comprises trans-1,3,3,3-tetrafluoropropene, 1-chloro-3,3,3-trifluoropropene or combinations of these and the sterically hindered amine catalyst comprises a catalyst selected from the group consisting of; dimethylcyclohexylamine, dicyclohexylmethylamine, dicyclohexylamine; t-butylisopropylamine; di-sec-butylamine, diisopropylamine; diisopropylethylamine; dimethylisopropylamine, and combinations thereof, wherein the amounts of each component are by weight of the polyol premix composition and wherein the premix comprises less than 5 wt. % of fluoride ion after exposure to 120° F. for three days.