| 摘要 |
1,247,671. Polyurethanes. A. M. A. E. EGGERS-LURA. 14 Oct., 1968 [12 Oct., 1967; 20 Feb., 1968], Nos. 46671/67 and 8268/68. Headings C3C and C3R. Polyurethanes are prepared by reacting a polyisocyanate with a polyol component a major part of which comprises a reaction mixture of a hydrocarbon fatty acid glyceride and a dialkanolamine the ratio of dialkanolamine to fatty acid radicals being between 0À75 and 2À0 and in which at least half of the fatty acid of the glyceride has been converted into alkanolamide. It is preferred to incorporate a blowing agent in the reaction mixture to prepare rigid polyurethane foams. The polyol is suitably derived from a naturally occurring fat or oil and diethanolamine and is most suitable for use when a sample of the reaction mixture mixed with an equal amount of the polyisocyanate to be used in the polyurethane process provides a homogeneous mixture. Examples of preferred naturally occurring fats or oils are lard, bone grease, peanut oil, sesame oil, sunflower seed oil, olive oil, palm oil, coconut oil, corn oil, cottonseed oil, rapeseed oil, linseed oil, soybean oil, tung oil or fish oils. Polymerized drying or semidrying oils may also be used. Other polyols may be admixed with the dialkanolamide containing component. The additional polyol may be an ammonium soap of a dialkanolamine and a fatty acid which is incorporated in the polyol component by reacting the fatty acid glyceride with excess dialkanolamine and then neutralizing the unreacted dialkanolamine with a fatty acid. Other dihydroxy compounds e.g. ethylene glycol and propylene glycol may be used as the additional polyol. A preferred blowing agent is petrol ether, which may be mixed with conventional blowing agents. In a typical example soybean oil is reacted with diethanolamine to form a polyol component which is mixed with water, a silicone surfactant, dimethylcocosamine, petrol ether and a polymethylene polyphenyl isocyanate to produce a polyurethane foam. |
