Influencing Factors for Synthesis of Epoxy Hexanoate Catalyzed with Acetylacetone Chromium(III) and Its Kinetic Analysis

The addition-esterification of epoxy resin and caproic acid catalyzed by acetylacetonate chromium(Ⅲ) was investigated.The effects of temperature and the catalyst mass fraction on the reaction were also investigated,and the catalytic ability was examined by comparing with tertiary amine and quaternary ammonium salt.The reaction product was characterized by FTIR and 1HNMR.The result showed that acetylacetonate chromium(Ⅲ) was a high-efficiency catalyst,with 0.4% of which the conversion of caproic acid could achieve 86.2% at 120 ℃ for 200 min.The reaction between epoxy resin and caproic acid was a second-order reaction,and the apparent activation energy(Ea) of the reaction was 139.476 kJ/mol by the kinetic calculation of the experimental data according to the integrated reaction rate equation.