COMPOSITE SEMIFINISHED PRODUCTS AND MOULDINGS PRODUCED THEREFROM AND DIRECTLY PRODUCED MOULDINGS BASED ON HYDROXY-FUNCTIONALIZED (METH)ACRYLATES AND URETDIONES WHICH ARE CROSSLINKED BY MEANS OF RADIATION TO GIVE THERMOSETS

摘要

The invention relates to a process for producing storage-stable polyurethane prepregs and to mouldings (composite components) produced therefrom. The prepregs and, respectively, components are produced by mixing (meth)acrylate monomers, (meth)acrylate polymers, hydroxy-functionalised (meth)acrylate monomers and/or hydroxy-functionalised (meth)acrylate polymers with uretdione materials. Photoinitiators can also optionally be added. This mixture or solution is applied by known processes to fibre material, e.g. carbon fibres, glass fibres or polymer fibres, and is polymerised with the aid of radiation or of plasma methods. Polymerisation, e.g. at room temperature or at up to 80° C., gives thermoplastics or thermoplastic prepregs, and these can subsequently also be subjected to forming processes. The hydroxy-functionalised (meth)acrylate constituents can then be crosslinked with the uretdiones already present within the system, by use of elevated temperature. It is thus possible to produce dimensionally stable thermosets or dimensionally stable crosslinked composite components.

主权项

1. A process for producing a composite semifinished product and further processing the composite semifinished product into a moulding, the process comprising:
producing a reactive composition comprising:
a reactive resin component based on (meth)acrylate wherein at least one constituent of the resin component has hydroxy groups, amine groups and/or thiol groups,an isocyanate component wherein at least one di- or poly-isocyanate is blocked with blocking agents or is internally blocked, andoptionally at least one photoinitiator; directly impregnating a fibrous substrate with the composition: hardening the resin component by electromagnetic radiation, electron beam, or with a plasma; shaping the composite semifinished product into the moulding; and hardening the isocyanate component.