FIELD: heat-saving technologies; energy-saving technologies.
SUBSTANCE: heat-accumulating composition, based on an eutectic mixtures of calcium nitrate tetrahydrate and cadmium nitrate tetrahydrate, contains an eutectic mixture of Ca(NO3)2·4H2O and Cd(NO3)2·4H2O with the addition of expanded graphite and carboxymethylcellulose, or an eutectic mixture of Ca(NO3)2·4H2O and Cd(NO3)2·4H2O with the addition of calcium oxide and carboxymethylcellulose, or an eutectic mixture of Ca(NO3)2·4H2O and Cd(NO3)2·4H2O with the addition of calcium hydroxide and carboxymethylcellulose. The heat-accumulating composition is characterized by a temperature of a phase transition, which ensures the operability of the composition as heat-accumulating material, between 36 and 45°C. The specified composition is prepared by heating to 60°C of the eutectic mixture of Ca(NO3)2·4H2O and Cd(NO3)2·4H2O, melting for 30 min with constant mixing, holding for 10 min, sequential addition of additives and further mixing for 3 h with a temperature control of 60°C.
EFFECT: invention makes it possible to obtain material for accumulating excess heat energy for the purpose of heating rooms, motor vehicle salons.
1 cl, 9 dwg, 1 tbl, 3 ex
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