PUL-CORE METHOD WITH A PMI FOAM CORE
The present invention relates to a novel process for the production of novel fibre-reinforced profile materials comprising a PMI foam core. In particular, the present invention relates to a novel pultrusion process, the abbreviated term used for which is pul-core process, which uses a single step for production of the fibre-reinforced profile material with simultaneous charging of the PMI foam core thereto. The same step here ensures very good linkage of the PMI foam core to the fibre-reinforced profile material.
1 . A process for the continuous production of fibre-reinforced continuous profiles comprising a PMI foam core, the process comprising performing a pultrusion process in which a foam core comprising PMI is introduced in a centre and, by means of the pultrusion process, an outer layer comprising a fibre material and a thermoplastic or a thermoset is formed around the the core.
2 . The process according to claim 1 , comprising introducing the foam core continuously in the form of a plurality of successive individual pieces into a pultrusion plant.
3 . The process according to claim 1 , wherein the fibre material comprises carbon fibres, glass fibres, polymer fibres, or textile fibres.
4 . The process according to claim 1 , wherein the thermoset comprises a material comprising one of the following resins: polyester, vinyl ester, phenolic, PU or epoxy resin.
5 . The process according to claim 1 , wherein the fibre material is in the form of individual fibres, rovings, non-wovens, wovens, laid scrims, or any combination thereof.
6 . The process according to claim 1 , wherein PMI foams in a density range of from 30 to 200 kg/m 3 are employed as material for the PMI foam core.
7 . The process according to claim 1 , wherein the pultrusion process comprises one of the following processes around the introduced foam core: modified pul-preforming, pul-winding or pul-braiding.
8 . A hollow profile, comprising PMI foam, a foam core and an outer material, wherein the outer material comprises a thermoset reinforced with a fibre material and the foam core comprises the PMI foam, and wherein the hollow profile comprising the PMI foam has no adhesive layer and no joints.
9 . The profile comprising PMI foam, according to claim 8 , wherein at an interface between PMI foam core and a jacket material, the PMI foam core has open pores comprising a matrix material.
10 . The profile according to claim 8 , wherein the thermoset comprises a hardened epoxy resin or hardened PU resin, and the fibre material comprises carbon fibres or glass fibres.
11 . The profile according to claim 8 , wherein the PMI foam comprises a further material comprising metal or another plastic, optionally in the form of a tube.
12 . The profile according to claim 8 , wherein the PMI foam has inserts.
13 . The profile according to claim 8 , wherein the profile is suitable for automobile construction, commercial vehicle construction, shipbuilding, aircraft construction, and helicopter construction, in the construction of installations for obtaining energy from wind, and in space travel.