Studies of the chemical structure of ionic liquids and its influence on the curing regularities and the properties of epoxide-containing liner compositions and the epoxy binder were performed. The used ionic liquids were compounds in which imidazolium and pyrrolidinium cations correspond to dicyanamide and tetracyano-borate anions. It was shown that ionic liquids with a dicyanamide anion possess a catalytic activity that is expressed in acceleration of curing of the epoxy-rubber liner composition, the EDT-10 epoxy binder, and the microorganoplastic on its basis. It was established that the use of ionic liquids as a curing catalyst instead of dimethylbenzylamine does not affect physical and mechanical characteristics, such as lifetime, strength, swelling in transformer oil, and structural glass-transition temperature of the liner composition and provides a high stable strength of microorganoplastic.