Epoxy resin system for making carbon fiber composites
AssigneeDow Global Technologies LLC
InventorsTimothy A. Morley, Rainer Koeniger, Martin Reimers, Peter J. Cate, Nebojsa Jelic, Zeljko Sikman
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Abstract
A two-component curable epoxy resin system including a dye solution. The resin system includes an epoxy resin component containing at least 80% by weight of a polyglycidyl ether of a polyphenol. The system also includes a hardener mixture containing mainly polyethylene tetraamines. The system includes triethylene diamine in specific amounts as a catalyst. The system has beneficial curing characteristics with desired color that make it useful for producing fiber-reinforced composites in a resin transfer molding process.
Claims4
A curable epoxy resin system, comprising
- 1) an epoxy resin component containing one or more epoxy resins, wherein at least 80% by weight of the epoxy resins is one or more polyglycidyl ethers of a polyphenol that has an epoxy equivalent weight of up to about 250;
- 2) an amine hardener, wherein the amine hardener is a polyethylene tetraamine mixture containing at least 95% by weight polyethylene tetraamines, the mixture containing at least 40% by weight linear triethylene tetraamine, wherein the epoxy resin component provides at least 0.8 epoxy equivalents per amine hydrogen equivalent provided by the amine hardener;
- and
- 3) 0.01 to 0.5 moles of triethylene diamine per mole of primary and/or secondary amine compounds in the amine hardener, the triethylene diamine being present in the epoxy resin component, the amine hardener, or both;
- wherein the resin system further comprises an internal mold release agent mixed with a dye solution, wherein the dye is a naphthalene diazine functionality with low degree of sulfonation.
A curable epoxy resin system, comprising
- 1) an epoxy resin component containing one or more epoxy resins, wherein at least 80% by weight of the epoxy resins is one or more polyglycidyl ethers of a polyphenol that has an epoxy equivalent weight of up to about 250;
- 2) an amine hardener, wherein the amine hardener is a polyethylene tetraamine mixture containing at least 95% by weight polyethylene tetraamines, the mixture containing at least 40% by weight linear triethylene tetraamine, wherein the epoxy resin component provides at least 0.8 epoxy equivalents per amine hydrogen equivalent provided by the amine hardener;
- and
- 3) 0.01 to 0.5 moles of triethylene diamine per mole of primary and/or secondary amine compounds in the amine hardener, the triethylene diamine being present in the epoxy resin component, the amine hardener, or both;
- wherein the resin system further comprises an internal mold release agent mixed with a dye solution, wherein the dye solution comprises 2-naphthalenol, 1-[2-(2-hydroxy-5-nitrophenyl)diazenyl], acetamide, N-[7-hydroxy-8-[2-(2-hydroxy-4-nitrophenyl)diazenyl]-1-naphthalenyl], and Mordant Black 17.
Dependencies are inferred from the claim text.