CURING AGENT FOR EPOXY RESINS AND METHOD FOR ITS PRODUCTION Russian patent published in 1995 - IPC

FIELD: production of curing agents of epoxy resins. SUBSTANCE: curing agent in form of reaction products of epoxydiane resin, aliphatic amine and acrylnitrile contains, mas.%: adduct of epoxydiane resin and aliphatic di- or polyamine 40-60; monocyanethylated aliphatic di- or polyamine 17.3-40.3; dicyanethylated aliphatic di- or polyamine 9.1-15.7; aliphatic di- or polyamine 5.0-7.0. Curing agent is produced as follows: first, solution of epoxydiane resin in acrylnitrile s prepared and it is introduced into aliphatic di- or polyamine. Mixture is heated up to 30-40 C and held up for 1.5-2.0 h. Then, temperature is raised up to 95-100 C and mixture is held for 1.0-1.5 h. Process is carried out until acrylnitrile is fully combined. Mole ratios of epoxydiane resin, acrylnitrile and aliphatic di- or polyamine are 1:(2.4-8.1):(4.4-10.1), respectively. EFFECT: higher efficiency. 2 cl, 4 tbl