Process for the production of fibre-reinforced composite parts
View Patent ↗The invention relates to a process for the production of fiber-reinforced composite components in which an outer film is bonded with a layer containing fiber-reinforced polyurethane, characterised in that a) first an elastic intermediate layer which has a modulus of elasticity of 0.5 MPa to 50 MPa and a thickness of 0.3 mm to 6 mm, is applied to the outer film which has a thickness in the range of 0.2 mm to 5 mm, and then b) at least one other layer is applied to the back of the intermediate layer, at least one layer containing fiber-reinforced polyurethane being applied.
1. A process for the production of fibre-reinforced composite components in which an outer film is bonded with a layer containing fibre-reinforced polyurethane comprising:
a) applying an elastic intermediate layer which has a modulus of elasticity of from 0.5 MPa to 50 MPa and a thickness of 0.3 mm to 6 mm to the outer film which has a thickness in the range of 0.2 mm to 5 mm, and
b) applying at least one other layer to the intermediate layer's surface which is not in contact with the outer layer, provided that at least one layer containing fibre-reinforced polyurethane is applied.
2. The process of claim 1 in which the intermediate layer has a compressive modulus of between 500 MPa and 5000 MPa.
3. The process of claim 2 in which the intermediate layer contains a polyurethane elastomer.
4. The process of claim 1 in which the intermediate layer contains a polyurethane elastomer.
5. The process of claim 3 in which the intermediate layer has viscoelastic properties.
6. The process of claim 1 in which the intermediate layer has viscoelastic properties.
7. The process of claim 2 in which application of the at least one other layer takes place before complete setting of the intermediate layer.
8. The process of claim 4 in which application of the at least one other layer takes place before complete setting of the intermediate layer.
9. The process of claim 6 in which application of the at least one other layer takes place before complete setting of the intermediate layer.
10. The process of claim 1 in which the intermediate layer is applied by spraying.
11. The process of claim 10 in which the spray application is carried out with an even mass distribution with less than +/−10% deviation of the mass of the intermediate layer based on surface elements of 5 cm 2 .
12. A composite comprising an outer film, an intermediate layer and at least one other layer, with at least one of the other layers containing fibre-reinforced polyurethane in which
a) the outer film has a thickness in the range of 0.2 mm to 5 mm, and
b) the elastic intermediate layer has a modulus of elasticity of 0.5 MPa to 50 MPa and a thickness of 0.3 mm to 6 mm, the elastic intermediate layer containing at least one polyurethane elastomer which is produced by reacting
(i) an organic di- and/or polyisocyanate with
(ii) at least one polyether polyol with a number average molecular weight of 800 g/mol to 25,000 g/mol and with a mean functionality of 2.4 to 8, and
(iii) optionally, at least one polyether polyol different from (ii) with a number average molecular weight of from 800 g/mol to 25,000 g/mol and a mean functionality of from 1.6 to 2.4, and
(iv) optionally, a polymer polyol with from 1 to 50 wt. % filler content, based on the polymer polyol and with an OH value of from 10 to 149 and a mean functionality of from 1.8 to 8, and
(v) optionally, a chain extender with a mean functionality of from 1.8 to 2.1, and a molecular weight no greater than 750 g/mol, and/or a crosslinking agent with a mean functionality of from 3 to 4 and a molecular weight of up to 750 g/mol, in the presence of
(vi) an amine catalyst and
(vii) a metal catalyst and
(viii) optionally, additives.