rigid polyurethane foams

By using hydroxypropyl derivatives of urea esterified with boric acid as polyol components and 4,4’-diphenylmethane diisocyanate the rigid polyurethane foams have been obtained. The influence of boron and nitrogen atoms on the properties of foams, inter alia compressive strength and flammability, has been discussed. The presence of borate groups enhances the compressive strength of polyurethane foams meaningfully. However, the flammability of foams is determined by the participation of carbamide groups mainly.

The conditions of polyurethane foams preparation with the use of new boroorganic compounds as polyols have been presented. The new polyols have been obtained by two methods: in reactions of N,N’-bis(2-hydroxyethyl)oxamide (BHEOD) and boric acid (BA) with excess of ethylene carbonate (EC) and in reactions of BHEOD esterified with BA with excess of EC. The results of determination of foaming process parameters as well as of investigation of the foams properties have been given.