Polyurethane systems for producing polyurethane sandwich parts at low molding temperatures

A process for the production of a polyurethane sandwich component, comprising:

• i) applying a polyurethane reaction mixture to at least one reinforcement fiber layer on a core layer, to yield a first component;
• ii) placing the first component from i) into a mold, and giving the first component from i) a three-dimensional shape by compressing the core layer in the mold, and hardening the polyurethane reaction mixture, to yield a molding;
• iii) removing the molding from the mold;
• and
• iv) optionally, subjecting the molding to further operations, wherein the polyurethane reaction mixture is obtained via mixing of the components of the polyurethane system comprising:
• a) at least one polyisocyanate;
• b) at least one isocyanate-reactive compound;
• c) at least one carboxylic salt of an amine catalyst;
• d) optionally, at least one further catalyst;
• e) optionally, a reactive chain extender comprising at least two groups reactive toward isocyanates, wherein at least one group reactive toward isocyanates is a free, primary NH2 group;
• and
• f) optionally, at least one further additive, and wherein, based on one equivalent of amine of the amine catalyst, from 0.5 to 1.5 equivalents of acid groups of a carboxylic acid are comprised.