Curable compositions based on epoxy resins without benzyl alcohol
View Patent ↗The invention relates to curable compositions comprising at least one epoxy resin and at least one hardener wherein the hardener is a compound of formula (I) or (II) where R 1 and R 2 are each independently selected from the group of substituents having the formula —(CH 2 ) x —NH 2 and x is in each case independently 0, 1, 2, 3 or 4, to surfaces comprising such compositions, to methods comprising applying a coating material comprising such compositions and to the use of such compositions as surface protection.
1. A curable composition, comprising:
an epoxy resin and
a hardener,
wherein the hardener is a compound of formula (I) or (II)
where R 1 and R 2 are each independently a substituent having formula —(CH 2 ) x —NH 2 and x is in each case independently a number of 0, 1, 2, 3 or 4.
2. The composition according to claim 1 , wherein x in R 1 and R 2 is 1.
3. The composition according to claim 1 , wherein the hardener is 5-aminomethyl-2-furfurylamine.
4. The composition according to claim 1 , wherein the epoxy resin is an epoxy resin based on bisphenol A diglycidyl ether, bisphenol F diglycidyl ether, and cycloaliphatic resins.
5. The composition according to claim 1 , which comprises less than 20 g of benzyl alcohol per 100 g of total hardeners comprised therein.
6. The composition according to claim 1 , which comprises less than 4 wt % of benzyl alcohol.
7. The composition according to claim 1 , which comprises no benzyl alcohol.
8. The composition according to claim 1 , wherein a stoichiometric ratio of a total amount of the epoxy resin to a total amount of the hardener is from 0.7 to 1.3.
9. The composition according to claim 8 , wherein the stoichiometric ratio of the total amount of the epoxy resin to the total amount of the hardener is from 0.9 to 1.1.
10. The composition according to claim 1 , further comprising: a second hardener comprising at least two or more primary and/or secondary amine groups.
11. The composition according to claim 1 , further comprising: a reaction accelerant.
12. The composition according to claim 1 , further comprising: a reactive diluent.
13. The composition according to claim 1 , further comprising pigments, fillers and/or additives.
14. A surface, which is coated with the composition according to claim 1 .
15. A method of coating a surface, the method comprising
applying to the surface a coating material comprising the composition according to claim 1 .
16. The method according to claim 15 , wherein the surface is a surface comprising metal, mineral substrate, plastic, paint/varnish, polymer concrete, adhesive, fibre composite, potting composition or an impregnation.
17. A surface protection on a surface or an impregnation, comprising: the composition according to claim 1 ,
wherein the surface comprises metal, mineral substrate, plastic, paint/varnish, polymer concrete, adhesive, fibre composite, or potting composition.
18. A composition obtained by a process comprising: curing the composition according to claim 1 .
19. The composition according to claim 10 , wherein the second hardener is selected from the group consisting of methylenedianiline, N-aminoethylpiperazine, isophoronediamine, m-phenylenebis(methylamine), 1,3- and/or 1,4-bis(aminomethyl)cyclohexane, trimethylhexamethylenediamine, a polyoxyalkyleneamine, a polyaminoamide, and a reaction product of an amine with acrylonitrile and a Mannich base.