| 摘要 |
FIELD: chemistry of polymers. SUBSTANCE: polyurethane foams having improved ability of retaining insulating properties are prepared using one or more novel polyols. One polyols is polyester having general formula (I):wherein T is any group which is actually non-reactive with respect to epichlorohydrin, except for halogen; Z is any integer from 0 to * and Q has general formula (II):wherein A is N, S or O; L is covalent bond or connecting group having 1 to 10 carbon atoms; I is integer from 1 to 10; J is integer from 2 to 8, and D is H; L is (((CHCHO))H), alkyl or aromatic group if A is N or electronic pair if A is S or O prepared by reaction of monoepoxide with compound having general formula (III):wherein X is H, Li, Na, K; A is N, S or O; L is covalent bond or connecting group having from 1 to 10 carbon atoms; M is any group capable of reacting with ethylene oxide molecule in the presence of basic catalyst, and J is integer from 2 to 8. The other polyol is prepared by (I) mixing ethylene carbonate and one or more compounds having hydroxyl functionality under reaction conditions sufficient of react ethylene carbonate with compounds having hydroxyl functionality to provide polyol precursor, and (2) by mixing polyol precursor with diethylene glycol and anhydride, dicarboxylic acid, tricarboxylic acid or mixtures thereof, optionally in the presence of catalyst. EFFECT: improved properties of the polyurethane foams. |
