A wide range of epoxy compounds has been developed for gluing in repair work and for protective coatings in construction work under subzero temperatures, particularly at the Vilyui, Krasnoyarsk, Ust'-Khantai, SayanShushen, and Ust'-Ilim hydroelectric power plants, as well as other hydraulic engineering sites.Information in the literature on the properties of epoxy compounds relates mainly to positive temperatures of the ambient medium. With the exception of experiments by the Siberian Branch of the B. E. Vedeneev All-Union Scientific-Research Institute of Hydraulic Engineering (VNIIG), which were carried out at temperatures in the interval from minus 8 to minus 10=C, little work has been done or the properties of hardening epoxy compounds at subzero temperatures [I, 7]. A report by Brojer and Penczek [2] deals with the hardening of epoxy resins at temperatures in the interval from 0 to 15"C.Bearing in mind the marked practical importance of the use of epoxy resins at subzero temperatures, we studied the kinetics of their change in strength, adhesion, and degree of completion of polymerization at positive (20*C) and minus (-20~ air temperatures. We also studied the effect of viscosity-reducing solvents. This involved determination of the optimal amount of solvent, i.e., the largest volume of solvent which does not lead to separation during hardening (syneresis) at temperatures of 18-20~We used ~D-6 epoxy resin, an amine-type curing agent (polyethylenepotyamines (PPA)and triethanolamine (TEA)). MGF-9 modifying plasticizer, and various solvents (acetone, styrene, xylene, and toluene). The specimens were tested for compression and tensile strength, film hardness, adhesion strength, and degree of completion of polymerization.
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