Flexible mouldings prepared from nitrogen, air or carbon dioxide blown polyurethane and their use

摘要

Flexible foamed polyurethane moldings of density below 500 kg/m 3>and DIN ISO 02769 maximum shrinkage 1.5% are obtained from mixtures of (a) organic isocyanates; (b) specified polyols; (c) crosslinkers/chain extenders; (d) blowing gents comprising nitrogen, air and/or carbon dioxide together with a chemical and/or physical blowing agent of boiling point -30 to +75[deg]C; and optionally also (e) emulsifiers; (f) additives or auxiliaries; and (g) catalysts : Flexible foamed polyurethane moldings of density below 500 kg/m 3>and DIN ISO 02769 maximum shrinkage 1.5% are obtained from mixtures with ratio molar NCO groups : NCO-reactive end groups = 0.95 : 1.15 comprising (a) organic isocyanates of 2-4 NCO groups per molecule and NCO content 6-49 wt.%; (b) polyols comprising (i) polyetheresterpolyols of number average molecular weight (M n) 800-6000, number average functionality 1.7-4 and ether : ester group weight ratio 0.05 : 0.95-0.48 : 0.52 obtained by polycondensation of (i.1) dicarboxylic acids or derivatives of up to 12C, (i.2) polyether polyols of M n1000-8000, average functionality 1.7-4 and ethyleneoxide content 10-40 wt.% and/or ether-based polymerpolyols of OH number 10-149 and average functionality 1.7-4, which contain 1-50 wt.% filler based on the polymerpolyol weight, (i.3) one or more polyols of M n62-750 and average functionality 2-8 which contain >=2 OH end groups per molecule and optionally (i.4) ester-based polymerpolyols of OH number 10-149 and average functionality 1.7-4 which contain 1-50 wt.% filler based on the polymerpolyol weight; and/or (ii) mixtures of (ii.1) polyesterpolyols consisting of polyesterpolyols of M n1000-4000 and functionality 1.4-7 and/or ester-based polymerpolyols as per (i.4) and (ii.2) 5-48 wt.% (based on (ii.1)) of polyetherpolyols consisting of ethyleneoxide-containing polyetherpolyols of M n900-18000, functionality 1.7-4 and ethyleneoxide content 10-40 wt.% and/or ether-based polymerpolyols OH number 10-149 and average functionality 1.7-4, which contain 1- 50 wt.% filler based on the polymerpolyol weight; (c) 5-25 wt.%, based on weight of (b) + (c), of crosslinkers/chain extenders; (d) blowing agents comprising nitrogen, air and/or carbon dioxide together with a chemical and/or physical blowing agent of boiling point -30 to +75[deg]C; and optionally also (e) emulsifiers; (f) additives or auxiliaries; and (g) catalysts An independent claim is also included for preparation of the polyurethane foam.