Hydrolysis resistant polyurethane mouldings made from polyester polyurethane

摘要

Producing polyurethane moldings, comprises mixing organic polyisocyanate with a polyol comprising polyester polyol, optionally a blowing agent, a chain extender and/or a crosslinking agent, an amine catalyst, an ionic liquid, carbodiimide compounds (I), and optionally auxiliaries and/or additives to obtain a reaction mixture, introducing the reaction mixture into a mold and reacting it to obtain polyurethane moldings. The molar ratio of ionic liquid and amine catalyst is 0.1:1-3:1. Producing polyurethane moldings, comprises mixing organic polyisocyanate with a polyol comprising polyester polyol, optionally a blowing agent, a chain extender and/or a crosslinking agent, an amine catalyst, an ionic liquid, carbodiimide compounds of formula (Z-N=C=N-Z) (I), and optionally auxiliaries and/or additives to obtain a reaction mixture, introducing the reaction mixture into a mold and reacting it to obtain polyurethane moldings. The molar ratio of ionic liquid and amine catalyst is 0.1:1-3:1. Z : organic group, where nitrogen atom of -N=C=N- is either bonded to a tertiary carbon atom or to a carbon atom of an aromatic system, which at ring positions adjacent to C-N bond in aromatic system, carries an organic group which is bonded to the aromatic system through a secondary- or tertiary carbon atom. An independent claim is also included for the polyurethane moldings obtainable by the above method.