Method for producing composite fiber components

A process for producing a polyurethane-based fiber composite component part comprising the following process steps:

• a) producing a polyurethane reaction mixture;
• b) applying the reaction mixture atop at least one of two carrier films;
• c) bestowing the reaction mixture on the at least one of the two carrier films with reinforcing fibers;
• d) bringing together the two carrier films from c) so that the carrier films on both sides surround the reaction mixture comprising the reinforcing fibers and a sandwich is formed;
• e) rolling the sandwich via at least one of rolls and rollers;
• g) converting the product from step e) to a desired size and removing the two carrier films;
• i) molding and completely curing the product from step g) in a mold to afford the fiber composite component part,
• wherein the employed polyurethane reaction mixture consists of the following components:
• A) one or more aromatic isocyanate components;
• B1) 70% to 100% by weight of one or more polyol components selected from the group consisting of polyether polyols, polyester polyols and polycarbonate polyols having 70% to 100% secondary OH groups based on all of the OH groups in the respective molecule of the polyol components and having a number average OH number of 15 to 500 mg KOH/g and a number-average functionality of 1.9 to 2.5;
• B2) 0% to 30% by weight of one or more polyols selected from the group consisting of polyether polyols, polyester polyols and polycarbonate polyols having a number average OH number of 15 to 500 mg KOH/g and a number-average functionality of 1.9 to 2.5 excluding the polyol component B1);
• wherein B1) and B2) sum to 100% by weight and at least 70% of the entirety of the OH groups of components B1) and B2) are secondary OH groups;
• C) optionally one or more short-chain polyols having a number average OH number of 550 to 2000 mg KOH/g and a number average functionality of 1.9 to 6;
• D) one or more internal release agents;
• E) one or more thermolatent catalysts catalytically active at temperatures of 50° C. to 120° C.;
• F) inorganic fillers;
• and
• G) optionally auxiliary and/or additive substances;
• wherein at 23° C. the polyurethane reaction mixture has a starting viscosity of 2500 to 14000 mPas and the ratio of the number of NCO groups of component A) to the number of OH groups of
• components B1), B2) and C) is from 1.35:1 to 10:1.