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Title: Use of 2,5-dimethyl-2,5-hexane diamine as a curing agent for epoxy resins

Abstract

Primary diamines are disclosed of the formula shown in a diagram wherein R is a straight chain saturated hydrocarbon of 2 to 4 carbons, a disubstituted benzene ring, or disubstituted dibenzomethane for use as a curing agent for epoxy resins. These curing agents can be used to form epoxy resin mixtures useful in filament winding and pre-impregnated fiber molding and in formulating film adhesives, powder coatings and molding powders. The epoxy mixtures form for such uses as room temperature non-reacting, intermediate stable state which has a latent cross-linking capability.

Inventors:
;
Publication Date:
OSTI Identifier:
7005264
Patent Number(s):
US 4252936; A
Application Number:
PPN: US 6-005940
Assignee:
Dept. of Energy, Washington, DC (United States) PTO; EDB-94-124492
DOE Contract Number:
W-7405-ENG-48
Resource Type:
Patent
Resource Relation:
Patent File Date: 24 Jan 1979
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; AMINES; CHEMICAL COMPOSITION; EPOXIDES; CURING; RESINS; ORGANIC COMPOUNDS; ORGANIC OXYGEN COMPOUNDS; ORGANIC POLYMERS; PETROCHEMICALS; PETROLEUM PRODUCTS; POLYMERS; 360601* - Other Materials- Preparation & Manufacture; 400201 - Chemical & Physicochemical Properties

Citation Formats

Rinde, J.A., and Newey, H.A. Use of 2,5-dimethyl-2,5-hexane diamine as a curing agent for epoxy resins. United States: N. p., 1981. Web.
Rinde, J.A., & Newey, H.A. Use of 2,5-dimethyl-2,5-hexane diamine as a curing agent for epoxy resins. United States.
Rinde, J.A., and Newey, H.A. 1981. "Use of 2,5-dimethyl-2,5-hexane diamine as a curing agent for epoxy resins". United States. doi:.
@article{osti_7005264,
title = {Use of 2,5-dimethyl-2,5-hexane diamine as a curing agent for epoxy resins},
author = {Rinde, J.A. and Newey, H.A.},
abstractNote = {Primary diamines are disclosed of the formula shown in a diagram wherein R is a straight chain saturated hydrocarbon of 2 to 4 carbons, a disubstituted benzene ring, or disubstituted dibenzomethane for use as a curing agent for epoxy resins. These curing agents can be used to form epoxy resin mixtures useful in filament winding and pre-impregnated fiber molding and in formulating film adhesives, powder coatings and molding powders. The epoxy mixtures form for such uses as room temperature non-reacting, intermediate stable state which has a latent cross-linking capability.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 1981,
month = 2
}
  • Primary diamines of the formula ##STR1## wherein R is a straight chain saturated hydrocarbon of 2 to 4 carbons, a disubstituted benzene ring, or disubstituted dibenzo methane for use as a curing agent for epoxy resins. These curing agents can be used to form epoxy resin mixtures useful in filament winding and pre-impregnated fiber molding and in formulating film adhesives, powder coatings and molding powders. The epoxy mixtures form for such uses as room temperature non-reacting, intermediate stable state which has a latent cross-linking capability.
  • Primary diamines are prepared for use as a curing agent for epoxy resins. These curing agents can be used to form epoxy resin mixtures useful in filament winding and preimpregnated fiber molding and in formulating film adhesives, powder coatings and molding powders. The epoxy mixtures form for such uses a room temperature non-reacting, intermediate stable state which has a latent cross-linking capability.
  • A new curing agent for epoxy resins that has both interesting and useful properties was found. The compound, 2,5 dimethyl 2,5 hexane diamine (DMHDA) is a sterically hindered primary aliphatic amine that, as a curing agent for DGEBA epoxy resins, has the following desirable characteristics: at room temperature it forms a stable B-stage resin; it is a good wet-filament winding resin having a low viscosity (0.5 Pa.s) and a long gel time (21 h for a 30-g mass); the cured resin properties are good, for example, the tensile strength is 86 MPa (12,500 psi), and the glass transition temperature ismore » greater than 140/sup 0/C when cured at 130/sup 0/C.« less
  • We have discovered a new curing agent for epoxy resins that has both interesting and useful properties. The compound, 2,5 dimethyl 2,5 hexane diamine (DMHDA) is a sterically hindered primary aliphatic amine that, as a curing agent for DGEBA epoxy resins, has the following desirable characteristics: (a) at room temperature it forms a stable B-stage resin; (b) it is a good wet-filament winding resin having a low viscosity (0.5 Pa.s) and a long gel time (21 h for a 30-g mass); (c) the cured resin properties are good - for example, the tensile strength is 86 MPa (12,500 psi), andmore » the glass transition temperature is greater than 140/sup 0/C when cured at 130/sup 0/C.« less
  • A curing agent for epoxy resins is described. It applies to epoxy resins having very high resistance to solvent and chemical attack. The curing agent consists of an aromatic diamine, an aralkanol, an epoxy novolac, and an aromatic acid. Methylene dianiline is the preferred aromatic diamine but other diamines such as, for example, metaphenylene diamine, and xylylene diamine may be employed if desired. The aralkanol can be benzyl alcohol. The increased viscosity and cross-linking of the finished product is enhanced by the epoxy novolac, accelerated by the aromatic acid, such as salicylic acid. When mixed with a liquid polyepoxide, themore » curing agent gives prompt cure to a finished product having excellent solvent resistance. (1 claim)« less