Composite components on the basis of hydrophobic polyols
The present invention relates to the use of hydrophopic polyols for producing fiber composite components on the basis of a polyurethane/polyisocyanurate reaction mixture, to a method for producing composite components and to the composite components as such. The method according to the invention is particularly economical in terms of saving material and time costs and the composite components obtained are characterized by excellent visual and material properties.
1. A fiber composite component comprising:
a fiber layer comprising polyurethane/polyisocyanurate, wherein the polyurethane/polyisocyanurate comprises a reaction product of a reaction mixture comprising:
A) an isocyanate component and
B) a polyol component;
wherein the polyol component B) comprises at least one hydrophobic polyol, wherein the at least one hydrophobic polyol is a polyether ester polyol comprising fatty acid ester residues having no free OH groups and having a content of fatty acid residues of 5% to 85% by weight, based on the total weight of the poly ether ester polyol and wherein the polyether ester polyol comprises a base-catalyzed reaction product of reactants comprising:
starter compounds having Zerewitinoff-active hydrogen atoms and
alkylene oxides in the presence of fatty acid esters.
2. A method for producing composite components, comprising:
a) providing a laminar structure comprising a core, and a fiber fabric;
b) contacting the laminar structure with a reaction mixture comprising:
A) an isocyanate component; B) a polyol component; and c) curing the reaction mixture;
wherein the polyol component comprises at least one hydrophobic polyol wherein the at least one hydrophobic polyol is a polyether ester polyol comprising fatty acid ester residues having no free OH groups and having a content of fatty acid residues of 5% to 85% by weight, based on the total weight of the poly ether ester polyol and
wherein the polyether ester polyol comprises a base-catalyzed reaction product of
reactants comprising:
starter compounds having Zerewitinoff-active hydrogen atoms and
alkylene oxides in the presence of fatty acid esters.
3. The method for producing composite components as claimed in claim 2 , wherein the reaction mixture is at a constant temperature of 25° C., 60 minutes after mixing, and has a viscosity of 50 to 500 mPas.
4. The method for producing composite components as claimed in claim 2 , wherein the NCO index is from ≥1.10 to ≤10.00.
5. The method for producing composite components as claimed in claim 2 , wherein the core, at least in sections, directly adjoins the fiber fabric layer including polyurethane/polyisocyanurate, wherein the core comprises a core material selected from the group consisting of wood, polyvinyl chloride (PVC) foam, polyester (PET) foam, and polyurethane (PUR) foam, and wherein the core has a water content of ≥0.5% by weight to ≤30% by weight.
6. The method for producing composite components as claimed in claim 2 , wherein step b) is conducted by a vacuum infusion method.
7. A rotor blade for wind turbines comprising a laminar structure having the following layers:
a core layer; and
a fiber layer comprising the fiber composite component as claimed in claim 1 .
8. The fiber composite component as claimed in claim 1 , further comprising a core layer.
9. The fiber composite component as claimed in claim 1 , wherein the at least one hydrophobic polyol of polyol component B) comprises an oleochemical polyol.
10. The fiber composite component as claimed in claim 1 , wherein the reaction mixture further comprises:
C) additives.
11. The method for producing composite components as claimed in claim 2 , wherein the laminar structure comprises a flow aid.
12. The method for producing composite components as claimed in claim 2 , wherein the at least one hydrophobic polyol comprises an oleochemical polyol.