Epoxy resin compositions for production of storage-stable composites
Epoxy resin compositions containing at least one resin component and at least one hardener component are suitable as a thermoset matrix for production of semi-finished fiber matrix products and cured fiber matrix laminates known as composites.
1. An epoxy resin composition, comprising:
A) at least one epoxy compound selected from the group consisting of a diglycidyl ether based on bisphenol A and a diglycidyl ether based on bisphenol F;
B) a hardener composition comprising:
B1) 65%-99% by weight of at least one polyamine based on triacetonediamine, and
B2) 1%-35% by weight of at least one compound having at least one functional group reactive toward epoxy groups in component A) selected from the group consisting of
(B2a) isophoronediamine,
(B2b) 4,4′-diaminodicyclohexylmethane, 2,4′-diaminodicyclohexylmethane, 2,2′-diaminodicyclohexylmethane, alone or in mixtures thereof, and
(B2c) a mixture of 2,2,4-trimethylhexamethylenediamine and 2,4,4-trimethylhexamethylenediamine,
wherein B1 and B2 total 100% by weight of B), and the stoichiometric ratio of the epoxy groups of A) and the number of active hydrogen atoms of the functional groups of B) varies from 1:2 to 2:1, and
C) 0.1%-10% by weight of at least one curing accelerator selected from the group consisting of an imidazole and an imidazole derivative,
wherein the amounts of A)-C) add up to 100% by weight.
2. The epoxy resin composition according to claim 1 , wherein the at least one polyamine based on triacetonediamine, B1), is selected from the group consisting of 2,2,6,6-tetramethyl-4-aminopiperidine (TAD), hexamethylenebis(4-amino-2,2,6,6-tetramethylpiperidine), N-butyl-4-amino-2,2,6,6-tetramethylpiperidine, N,N-dimethylaminopropyl-4-amino-2,2,6,6-tetramethylpiperidine, N-propyl-4-amino-2,2,6,6-tetramethylpiperidine, N-isopropyl-4-amino-2,2,6,6-tetramethylpiperidine, N-hydroxyethyl-4-amino-2,2,6,6-tetramethylpiperidine, N-methoxyethyl-4-amino-2,2,6,6-tetramethylpiperidine, N-methoxyethyl-4-amino-2,2,6,6-tetramethylpiperidine, N′,N′-dimethylaminoethyl-4-amino-2,2,6,6-tetramethylpiperidine, N-morpholinoethyl-4-amino-2,2,6,6-tetramethylpiperidine, N-piperazinoethyl-4-amino-2,2,6,6-tetramethylpiperidine, and 4-morpholino-2,2,6,6-tetramethylpiperidine.
3. The epoxy resin composition according to claim 1 , wherein B1) is 2,2,6,6-tetramethyl-4-aminopiperidine (TAD) and B2) is isophoronediamine.
4. A composition comprising the epoxy resin composition according to claim 1 and D) an additive.
5. A storage-stable composite, obtained from the epoxy resin composition according to claim 1 .
6. A storage-stable composite, obtained from
1) at least one fibrous carrier, and
2) the epoxy resin composition according to claim 1 .
7. A process for producing a storage-stable composite according to claim 6 , said process comprising:
I. providing said epoxy resin composition,
II. impregnating the fibrous carrier with the composition from I,
III. converting the epoxy resin composition from I at temperatures of 23-200° C. to a conversion of 1%-90%,
IV. unwinding or laying out the storage-stable composite.
8. A storage-stable prepreg or storage-stable sheet moulding compound composite, obtained from
1) at least one fibrous carrier, and
2) the epoxy resin composition according to claim 1 .
9. A process for producing a storage-stable sheet moulding compound composite, said process comprising:
I. providing the epoxy resin composition according to claim 1 ,
II. impregnating a fibrous carrier with the composition from I,
III. converting the epoxy resin composition from I at temperatures of 23-200° C. to a conversion of 1%-90%, to obtain a reactive sheet moulding compound composite, and
IV. laying out the reactive sheet moulding compound composite.
10. A process for producing a storage-stable prepreg, said process comprising:
I. providing the epoxy resin composition according to claim 1 ,
II. impregnating a fibrous carrier with the composition from I,
III. converting the epoxy resin composition from I at temperatures of 23-200° C. to a conversion of 1%-90%, to obtain a reactive prepreg, and
IV. laying out the reactive prepreg.
11. A composite component, obtained from at least one fibrous carrier and at least one crosslinked epoxy resin composition, wherein said epoxy resin composition is as defined in claim 1 .