POLYETHERPOLYOL FOR THE PREPARATION OF HARD FOAM POLYURETHANES

摘要

The polyetherpolyol has aromatics from 2 to 35%, average nominal functionality (Fn) 2.0-4.5 and hydroxyl value from 390 to 650 mg KOH/g, where the aromatic carbon atoms are contained in structural radicals having the general formula: where both R1 groups, separate from each other, are hydrogen or C1-3 alkyl group, both R2 groups, separately, are C1-3 alkyl group and n has the value of an integer from 0 to 3. The method for the preparation of the polyetherpolyol includes reaction between alkyl oxide and polyvalent alcohol mixture containing diphenylolalkane source of the said structural radical and at least one aliphatic or alicyclic polyvalent alcohol having functionality of at least 2.0. The polyetherpolyol mixture having aromatics from 2 to 10% and Fn 2.5-5.0 equiv./mol contains the said polyetherpolyol in one or more aliphatic or alicyclic polyetherpolyols having Fn at least 2.5 equiv./mol. Hard foam polyurethane having total aromatics from 35 to 50% is produced when a composition containing the said polyol or polyol mixture having aromatics from 2 to 10% and Fn 2.5-5.0 equiv./mol and aromatic polyisocyanate in such quantity are foamed that the isocyanate index shall be from 100 to 150, where the polyol reagent corresponds to 1 to 10% of the total aromatics of the hard foam polyurethane. 13 claims