HYBRID COMPONENT PART COMPRISING A LOCAL STIFFENING COMPOSED OF A TWO-STAGE-CROSSLINKED POLYURETHANE-BASED FIBRE COMPOSITE MATERIAL

摘要

The invention relates to a hybrid component part comprising a local stiffening made of a two-stage-crosslinked polyurethane-based fibre composite material, more particularly to the production of such a hybrid component part. Said invention has for its object to specify a technology which makes it possible in cost-effective fashion to effect local stiffening of metal parts with a fibre composite material in order thus to obtain a hybrid component part. It is a fundamental concept of the process according to the present invention to use a particular polyurethane formulation which in a first crosslinking reaction can be converted into a thermoplastic polymer and later in a second crosslinking reaction is fully crosslinked to afford a thermoset matrix material. The thermoplastic polymer is characterized by a good adhesion to metal surfaces. The metal can be subjected to further forming with the attached thermoplastic material. The polyurethane is subsequently thermosettingly cured and achieves its final stiffness.

主权项

1. Process for producing a hybrid component part comprising the steps of:
a) providing a reactive composition at least comprising:
at least one hardener which is a uretdione having an NCO functionality of at least two,at least one binder which is a polyol compound having an OH functionality of 3 to 6 and which comprises at least one polar functional group selected from an ester, carbonate, amide, urethane, urea, thioester or thiocarbonate functionality; b) providing fibres; c) coating the fibres with the reactive composition; d) exposing at least the reactive composition to heat to perform a first crosslinking reaction in the course of which hardener and binder are converted into a thermoplastic polymer, thus embedding the fibres into the thermoplastic polymer; e) providing a metallic main body or a semifinished precursor thereof; f) placing the thermoplastic polymer comprising the fibres embedded therein onto a localized area of the main body/semifinished precursor thereof; g) pressing the thermoplastic polymer onto the main body/semifinished precursor thereof so that the fibres adhere to the main body/semifinished precursor thereof via the thermoplastic polymer; h) forming the semifinished precursor comprising the thermoplastic polymer adherent thereto to afford the metallic main body provided that only a semifinished precursor of the main body was provided in step e); i) exposing at least the thermoplastic polymer to heat to perform a second crosslinking reaction in the course of which the thermoplastic polymer is converted to a thermoset polymer; k) obtaining the hybrid component part comprising at least the metallic main body provided with at least one local stiffening composed of a fibre composite material, wherein the fibre composite material comprises a matrix formed from the thermoset polymer and the fibres embedded therein.