EFFICIENT PRODUCTION OF COMPOSITE SEMIFINISHED PRODUCTS AND COMPONENTS IN A WET PRESSING METHOD USING HYDROXY FUNCTIONALIZED (METH)ACRYLATES WHICH ARE DUROPLASTICALLY CROSSLINKED USING ISOCYANATES OR URETDIONES

摘要

The invention relates to a process for producing semi-finished composites and composite components. For production of the semi-finished products or components, (meth)acrylate monomers, (meth)acrylate polymers, polyfunctionalized (meth)acrylates, hydroxy-functionalized (meth)acrylate monomers and/or hydroxy-functionalized (meth)acrylate polymers are mixed with di- or polyisocyanates or with uretdione materials. This liquid mixture is applied by known processes to fibre material, for example carbon fibres, glass fibres or polymer fibres, and polymerized with the aid of a first temperature increase or of a redox accelerator or by means of photoinitiation. Polymerization, for example at room temperature or at up to 120° C., gives rise to thermoplastics which can still be subjected to a forming operation. The hydroxy-functionalized (meth)acrylate constituents can subsequently be crosslinked in a press with isocyanates or uretdiones already present in the system at a second temperature at least 20° C. above the polymerization temperature. In this case, the shaping to give the final component is effected simultaneously in this press. In this way, dimensionally stable thermosets or crosslinked composite components can be produced.