Prepegs and molded bodies produced thereof at low temperature

1. A prepreg, consisting essentially of

A) at least one fibrous support, and

B) a matrix material comprising at least one highly reactive powdery polyurethane composition comprising at least one uretdione group, said composition consisting essentially of:

a) at least one curing agent comprising at least one uretdione group obtained by polyaddition of at least one aliphatic, (cyclo)aliphatic, or cycloaliphatic polyisocyanate comprising at least one uretdione group and at least one compound comprising at least one hydroxyl, wherein the curing agent exists in solid form across an entire range below 40° C. and in liquid form across an entire range above 125° C., and has a free NCO content of less than 5 wt. % and a uretdione content of 3-25 wt. %;

b) at least one hydroxyl group-comprising polymer, which exists in solid form across an entire range below 40° C. and in liquid form above 125° C., across an entire range and has an OH number between 20 and 200 mg KOH/gram;

c) 0.1 to 5 wt. % of at least one catalyst selected from the group consisting of a quaternary ammonium salt and a quaternary phosphonium salt with at least one counter-ion selected from the group consisting of a halogen, a hydroxide, an alcoholate, an organic acid anion, and an inorganic acid anion;

d) 0.1 to 5 wt. % of at least one cocatalyst selected from the group consisting of

d1) an epoxide, and

d2) at least one acetylacetonate cocatalyst selected from the group consisting of a quaternary ammonium acetylacetonate cocatalyst, a quaternary phosphonium acetylacetonate cocatalyst, and a combination thereof; and

e) optionally, at least one selected from the group consisting of an auxiliary substance and a polyurethane additive,

wherein the at least one curing agent a) and the at least one hydroxy-comprising polymer b) are present in a ratio such that for every hydroxyl group of the polymer b) 0.3 to 1 uretdione groups of the curing agent a) is consumed.

2. The prepreg of claim 1 , wherein the matrix material has a Tg of at least 40° C.

3. The prepreg of claim 1 , wherein the fibrous support comprises at least one selected from the group consisting of a glass, carbon, a plastic, a natural fiber, and a mineral fiber material.

4. The prepregs of claim 1 , wherein the fibrous support comprises at least one planar textile body selected from the group consisting of a non-woven material, a knitted good, a non-knitted skein, a netting, a long fiber material, and short fiber material.

5. The prepreg of claim 1 , wherein the

at least one curing agent a) comprises at least one diisocyanate or polyisocyanate comprising at least one uretdione group.

6. The prepreg of claim 1 , wherein the curing agent a) comprises at least one temporarily deactivated di- or poly-isocyanate selected from the group consisting of isophorone diisocyanate (IPDI), hexamethylene diisocyanate (HDI), diisocyanatodicyclo-hexylmethane (H 12 MDI), 2-methylpentane diisocyanate (MPDI), 2,2,4-trimethylhexa-methylene diisocyanate/2,4,4-trimethyl-hexamethylene diisocyanate (TMDI), and norbornane diisocyanate (NBDI), said di- or poly-isocyanate being temporarily deactivated (internally blocked) by the at least one uretdione group.

7. The prepreg of claim 1 , wherein the at least one catalyst c) is selected from the group consisting of tetramethylammonium formate, tetramethylammonium acetate, tetramethylammonium propionate, tetramethylammonium butyrate, tetramethylammonium benzoate, tetraethylammonium formate, tetraethylammonium acetate, tetraethylammonium propionate, tetraethylammonium butyrate, tetraethylammonium benzoate, tetrapropylammonium formate, tetrapropylammonium acetate, tetrapropylammonium propionate, tetrapropylammonium butyrate, tetrapropylammonium benzoate, tetrabutylammonium formate, tetrabutylammonium acetate, tetrabutylammonium propionate, tetrabutylammonium butyrate, tetrabutylammonium benzoate, tetrabutylphosphonium acetate, tetrabutylphosphonium formate and ethyltriphenylphosphonium acetate, tetrabutylphosphonium benzotriazolate, tetraphenylphosphonium phenolate and trihexyltetradecylphosphonium decanoate, methyltributylammonium hydroxide, methyltriethylammonium hydroxide, tetramethylammonium hydroxide, tetraethylammonium hydroxide, tetrapropylammonium hydroxide, tetrabutylammonium hydroxide, tetrapentylammonium hydroxide, tetrahexylammonium hydroxide, tetraoctylammonium hydroxide, tetradecylammonium hydroxide, tetradecyltrihexylammonium hydroxide, tetraoctadecylammonium hydroxide, benzyltrimethylammonium hydroxide, benzyltriethylammonium hydroxide, trimethylphenylammonium hydroxide, triethylmethylammonium hydroxide, trimethylvinylammonium hydroxide, methyltributylammonium methanolate, methyltriethylammonium methanolate, tetramethylammonium methanolate, tetraethylammonium methanolate, tetrapropylammonium methanolate, tetrabutylammonium methanolate, tetrapentylammonium methanolate, tetrahexylammonium methanolate, tetraoctylammonium methanolate, tetradecylammonium methanolate, tetradecyltrihexylammonium methanolate, tetraoctadecylammonium methanolate, benzyltrimethylammonium methanolate, benzyltriethylammonium methanolate, trimethylphenylammonium methanolate, triethylmethylammonium methanolate, trimethylvinylammonium methanolate, methyltributylammonium ethanolate, methyltriethylammonium ethanolate, tetramethylammonium ethanolate, tetraethylammonium ethanolate, tetrapropylammonium ethanolate, tetrabutylammonium ethanolate, tetrapentylammonium ethanolate, tetrahexylammonium ethanolate, tetraoctylammonium methanolate, tetradecylammonium ethanolate, tetradecyltrihexylammonium ethanolate, tetraoctadecylammonium ethanolate, benzyltrimethylammonium ethanolate, benzyltriethylammonium ethanolate, trimethylphenylammonium ethanolate, triethylmethylammonium ethanolate, trimethylvinylammonium ethanolate, methyltributylammonium benzylate, methyltriethylammonium benzylate, tetramethylammonium benzylate, tetraethylammonium benzylate, tetrapropylammonium benzylate, tetrabutylammonium benzylate, tetrapentylammonium benzylate, tetrahexylammonium benzylate, tetraoctylammonium benzylate, tetradecylammonium benzylate, tetradecyltrihexylammonium benzylate, tetraoctadecylammonium benzylate, benzyltrimethylammonium benzylate, benzyltriethylammonium benzylate, trimethylphenylammonium benzylate, triethylmethylammonium benzylate, trimethylvinylammonium benzylate, tetramethylammonium fluoride, tetraethylammonium fluoride, tetrabutylammonium fluoride, tetraoctylammonium fluoride, benzyltrimethylammonium fluoride, tetrabutylphosphonium hydroxide, tetrabutylphosphonium fluoride, tetrabutylammonium chloride, tetrabutylammonium bromide, tetrabutylammonium iodide, tetraethylammonium chloride, tetraethylammonium bromide, tetraethylammonium iodide, tetramethylammonium chloride, tetramethylammonium bromide, tetramethylammonium iodide, benzyltrimethylammonium chloride, benzyltriethylammonium chloride, benzyltripropylammonium chloride, benzyltributylammonium chloride, methyltributyl-ammonium chloride, methyltripropylammonium chloride, methyltriethylammonium chloride, methyltriphenylammonium chloride, phenyltrimethylammonium chloride, benzyltrimethylammonium bromide, benzyltriethylammonium bromide, benzyltripropylammonium bromide, benzyltributylammonium bromide, methyltributylammonium bromide, methyltripropylammonium bromide, methyltriethylammonium bromide, methyltriphenylammonium bromide, phenyltrimethylammonium bromide, benzyltrimethylammonium iodide, benzyltriethylammonium iodide, benzyltripropylammonium iodide, benzyltributylammonium iodide, methyltributylammonium iodide, methyltripropylammonium iodide, methyltriethylammonium iodide, methyltriphenylammonium iodide and phenyltrimethylammonium iodide, methyltributylammonium hydroxide, methyltriethylammonium hydroxide, tetramethylammonium hydroxide, tetraethylammonium hydroxide, tetrapropylammonium hydroxide, tetrabutyl-ammonium hydroxide, tetrapentylammonium hydroxide, tetrahexylammonium hydroxide, tetraoctylammonium hydroxide, tetradecylammonium hydroxide, tetradecyltrihexylammonium hydroxide, tetraoctadecylammonium hydroxide, benzyltrimethylammonium hydroxide, benzyltriethylammonium hydroxide, trimethylphenylammonium hydroxide, triethylmethylammonium hydroxide, trimethylvinylammonium hydroxide, tetramethylammonium fluoride, tetraethylammonium fluoride, tetrabutylammonium fluoride, tetraoctylammonium fluoride, and benzyltrimethylammonium fluoride.

8. The prepreg of claim 7 , wherein the at least one catalyst c) is selected from the group consisting of a tetraethylammonium benzoate and tetrabutylammonium hydroxide.

9. The prepeg of claim 1 , wherein the epoxide d1) comprises at least one selected from the group consisting of a glycidyl ether, a glycidyl ester, an aliphatic epoxide, a diglycidyl ether based on bisphenol A, and a glycidyl methacrylate.

10. The prepeg of claim 9 , wherein the epoxide d1) comprises at least one selected from the group consisting of triglycidyl isocyanurate, a mixture of diglycidyl terephthalate and triglycidyl trimellitate, a glycidyl ester of Versatic acid, 3,4-epoxycyclohexylmethyl 3′,4′-epoxycyclohexanecarboxylate (ECC), a diglycidyl ether based on bisphenol A, ethylhexyl glycidyl ether, butyl glycidyl ether, pentaerythritol tetraglycidyl ether, and a Polypox grade having at least one free epoxy group.

11. The prepreg of claim 1 , wherein the acetylacetonate cocatalyst d2) is at least one selected from the group consisting of tetramethylammonium acetylacetonate, tetraethylammonium acetylacetonate, tetrapropylammonium acetylacetonate, tetrabutylammonium acetylacetonate, benzyltrimethylammonium acetylacetonate, benzyltriethylammonium acetylacetonate, tetramethylphosphonium acetylacetonate, tetraethylphosphonium acetylacetonate, tetrapropylphosphonium acetylacetonate, tetrabutylphosphonium acetylacetonate, benzyltrimethylphosphonium acetylacetonate, and benzyltriethylphosphonium acetylacetonate.

12. The prepeg of claim 11 , wherein the acetylacetonate cocatalyst d2) is at least one selected from the group consisting of tetraethylammonium acetylacetonate and tetrabutylammonium acetylacetonate.

13. A process for producing the prepreg of claim 1 , the process comprising:

applying matrix material B) to the fibrous support A); and

optionally fixing the matrix material B).

14. The method of claim 13 , wherein the

at least one curing agent a) comprises at least one diisocyanate or polyisocyanate comprising at least one uretdione group.

15. A boat, ship, a unit of aerospace technology equipment, an automobile part, bicycle part, motorcycle part, a construction material, medical engineering part, a piece of sports equipment, an electronics part, or a part in a power generating plant, comprising the prepreg of claim 1 .

16. A process for producing a composite component, comprising heating the prepreg of claim 1 at a temperature of more than 100° C. up to 160° C., optionally under at least one selected from the group consisting of vacuum and pressure.

17. The prepreg of claim 1 , wherein the fibrous support A) comprises at least one selected from the group consisting of a polyamide and a polyester.

18. A composite component, comprising the prepreg of claim 1 .