Preparation method of aliphatic dibasic acid/bentonite composite phase change energy storage material

Abstract

The invention relates to a preparation method of a composite phase change energy storage material by using bentonite as a base body and using aliphatic dibasic acid as a phase change energy storage body, which belongs to the technical field of the preparing technology of energy storage materials and comprises the steps of: putting the bentonite, CTAB (cetyltriethylammnonium bromide) and deionized water into a reaction container to heat and stir; modifying the bentonite; preparing a eutectic system of aliphatic dibasic acid by using myristic acid (MA) and palmitic acid (PA), or lauric acid (LA) and myristic acid (MA); heating 20% to 37% of eutectic mixture of the aliphatic dibasic acid, 26% to 42% of modified bentonite and 36% to 44% of absolute ethyl alcohol in the reaction container to 75 DEG C; stirring for 2 hours; and drying a product in the reaction container to constant weight to obtain the aliphatic dibasic acid/bentonite composite phase change material. The material has good heat storage capability and the stability of storing heat circulation, and can be used for the fields of using waste heat, residual heat and solar energy and the like.

Description

technical field [0001] The invention belongs to the field of energy storage composite materials, and in particular relates to a preparation method of a composite phase change energy storage material based on modified bentonite and a dibasic fatty acid as an energy storage main body. Background technique [0002] At present, most inorganic phase change materials are corrosive to a certain extent, and there are shortcomings such as overcooling and phase separation during the phase change process, which affect their energy storage capacity and service life. However, fatty acids are less corrosive, less undercooling during the phase transition process, or have almost no shortcomings such as undercooling and phase separation, and their chemical properties are relatively stable and cheap, so they are ideal organic phase change energy storage materials; but The phase transition temperature of a single fatty acid is relatively high, which makes it difficult to meet the requirements ...

AI Technical Summary

Problems solved by technology

[0002] At present, most inorganic phase change materials are corrosive to a certain extent, and there are shortcomings such as supercooling and phase separation during the phase change process, which affect their energy storage capacity and service life.

However, fatty acids are less corrosive, less undercooling during the phase transition process, or have almost no shortcomings such as undercooling and phase separation, and their chemical properties are relatively stable and cheap, so they are ideal organic phase change energy storage materials; but The phase transition temperature of a single fatty acid is relatively high, which makes it difficult to meet the requirements of low-temperature energy storage systems, and organic phase change materials generally have the disadvantage of low thermal conductivity, which leads to their poor heat storage performance in the application of heat storage systems, and the utilization of heat storage energy The efficiency is low, which reduces the practical effect of its energy storage