COMPOSITE SEMI-FINISHED PRODUCTS, MOLDED PARTS PRODUCED THEREFROM, AND DIRECTLY PRODUCED MOLDED PARTS BASED ON HYDROXY-FUNCTIONALIZED (METH)ACRYLATES AND URETDIONES THAT ARE CROSS-LINKED IN A THERMOSETTING MANNER

摘要

The invention relates to a method for producing storage-stable polyurethane prepregs and to molded bodies (composite components) produced therefrom. In order to produce the prepregs or components, (meth)acrylate monomers, (meth)acrylate polymers, hydroxy-functionalized (meth)acrylate monomers, and/or hydroxy-functionalized (meth)acrylate polymers, for example, are mixed with non-(meth)acrylic polyols and with uretdione materials. In accordance with known methods, this mixture or solution is applied to fiber material, such as carbon fibers, glass fibers, or polymer fibers, and is thermally polymerized, by means of a redox initiation or by means of irradiation or plasma applications. After polymerization, e.g., at room temperature or at up to 80 °C, thermoplastics or thermoplastic prepregs that can still be subsequently deformed arise. The hydroxy-functionalized (meth)acrylate constituents and the polyols can then be cross-linked with the uretdiones already present in the system by means of increased temperature. In this way, dimensionally stable thremosets or cross-linked composite components can be produced.