METHOD FOR PREPARING EPOXY RESIN HARDENING AGENT Russian patent published in 2006 - IPC C08G59/40 C08G59/50 C08L63/00 C09D163/00 C09J163/00 

FIELD: organic chemistry, chemical technology.

SUBSTANCE: invention relates to a method for preparing the epoxy resins hardening agent. Method for preparing a hardening agent involves process for interaction of amine of the general formula (A): wherein a = 2-10; n = 1-6 with acrylic or alkylacrylic acid ester of the general formula (B): wherein R₁ means hydrogen atom or alkyl radical; R₂ means alkyl radical in the presence of catalyst. Catalyst represents aromatic, aliphatic or heterocyclic compound comprising tertiary or tertiary and secondary nitrogen atoms (C) simultaneously as a solution in the concentration from 10% to 90% in an organic solvent. The ratio of components (A):(B):(C) is from 80:19.7:0.3 to 30:65:5, respectively. The process is carried out at temperature from 30°C to 80°C for 10-60 min. The prepared aminoester (D) is kept at temperature from +10°C to +30°C for 6-15 days, and then acrylic or methacrylic acid (E) is added in the ratio = D:E from 99:1 to 92:8 to aminoester and the mixture is stirred at temperature from 30°C to 70°C for 5-65 min. Invention provides preparing a hardening agent stable in prolonged storage, without sharp odor and providing the enhanced strengthening indices and resistance against climatic effects. Invention can be used in preparing epoxy compounds, binding agents in preparing plastics, anti-corrosive and decorative coatings.

EFFECT: improved preparing method.

2 tbl, 8 ex