Polyethylene glycol/polyethyleneimine composite solid-solid phase change material and preparation thereof

Abstract

The invention discloses a polyethylene glycol / polyethyleneimine composite solid-solid phase change material which is prepared from polyethylene glycol, a silane coupling agent and polyethyleneimine through a chemical grafting reaction. The phase change process is solid-solid phase change, the phase change temperature is 31-58 DEG C, and the phase change enthalpy value is 103-151 J / g; and under thecondition of 80-120 DEG C, the stable solid state is still kept after heat preservation is performed for 1-2h, and micromolecule leakage is avoided. The preparation method comprises the following steps: (1) preparing a KH560-PEG prepolymer; and 2) preparing the composite solid-solid phase change material, in which solvents used in the preparation process are all water and are all carried out under an air condition. The polyethylene glycol / polyethyleneimine composite solid-solid phase change material and preparation thereof have the following advantages: 1, the novel curing agent provided by the invention successfully solves the problem of liquid leakage in the phase change process, and maintains a high phase change enthalpy value; and 2, the novel cross-linking agent provided by the invention does not need a special atmosphere and an organic solvent, the experimental conditions are simplified, and a catalyst is not needed, so that the production cost is reduced. Therefore, the methodhas a wide application prospect.

Description

technical field [0001] The invention relates to the technical field of phase change energy storage materials, in particular to a polyethylene glycol / polyethyleneimine composite solid-solid phase change material and a preparation method thereof. Background technique [0002] With the development of human society and the continuous advancement of science and technology, the demand and consumption of energy are increasing year by year. Therefore, energy-saving and environmentally friendly materials have received extensive attention. Phase change materials refer to substances that change the internal state of matter simultaneously with changes in the external temperature, and absorb or release a large amount of latent heat, so as to achieve the purpose of controlling the temperature of the surrounding environment. It has been used in solar energy utilization, waste heat recovery, intelligent air-conditioning buildings, agricultural greenhouses, battery thermal management, clothi...

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Problems solved by technology

Prior art Özgül Gök etc. utilized chemical grafting to invent a polyethylene glycol / cellulose phase change reaction composite material as a latent heat storage material (Ö. Gök, C. Alkan, Y. Konuklu, Developing a poly(ethyleneglycol) / cellulose phase change reactive composite for cooling application, Solar Energy Materials and Solar Cells 191 (2019) 345-349.), which uses cellulose as a curing agent, the technical problem of this method is that the combination of cellulose and polyethylene glycol The effect is large, so that the enthalpy of the synthesized composite phase change material is only 78-92 J / g, so it is limited in application

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