A kind of styrene acrylonitrile copolymer grafted fatty acid solid-solid phase change material and preparation method thereof

Abstract

The invention provides a styrene-acrylonitrile copolymer grafted fatty acid solid-solid phase change material and a preparation method thereof and belongs to the technical field of phase change materials. The method comprises the following steps: adding a styrene-acrylonitrile copolymer into trichloromethane; stirring to dissolve; dropwise adding fatty acid subjected to acylating chlorination into an aluminum chloride solution in an ice bath atmosphere; uniformly stirring, dropwise adding into a styrene-acrylonitrile copolymer solution; after ice bath for half a hour, slowly heating to 60-75 DEG C; reacting for 6-8 hours; washing to de-complex by icy hydrochloric acid; then, washing by deionized water until the solution is neutral, purifying by ethyl ether to obtain the solid-solid phase change material. The material is free from toxicity and corrosion, good in shape stability and thermal stability, moderate in phase change temperature and high in latent heat of phase change, can be used for solving the problem of leakage of low eutectic mixture of fatty acid in the phase change process, is free from equipment packaging and can be directly processed and used, so that the application field is expanded. The styrene-acrylonitrile copolymer grafted fatty acid solid-solid phase change material is simple in preparation process, easily available in raw materials and suitable for industrial production and has a wide application prospect.

Description

technical field [0001] The invention belongs to the technical field of phase change materials, in particular to a styrene-acrylonitrile copolymer grafted fatty acid solid-solid phase change material and a preparation method thereof. Background technique [0002] With the growing problems of energy crisis, energy consumption and environment, the field of phase change energy storage has set off a research boom. Phase change energy storage technology is one of the important ways to solve the shortage of energy supply, improve resource utilization and protect the environment. Phase change materials are widely used in aerospace, building heat preservation, temperature-regulating fibers, agriculture and other fields. The most commonly used phase change materials at home and abroad are solid-liquid phase change materials, but they must be sealed with containers when used, otherwise they will corrode equipment and pollute the environment due to leakage; materials with solid-solid ph...

AI Technical Summary

Problems solved by technology

There are two main methods for the preparation of polymer grafted solid-solid phase change materials. One method is to prepare a macromonomer with a phase transition function and then use the macromonomer to copolymerize with a skeleton macromonomer to obtain a solid phase transition material with a phase transition function. Functional graft copolymers, such as Guo Jing [1], etc. provide a graft copolymer with a phase transition temperature of 40-50 °C prepared by copolymerization of acrylonitrile and polyethylene glycol acrylate, and through wet spinning The phase change fiber is prepared from silk. The disadvantage of this method is that the enthalpy of phase change is greatly affected by the grafting rate, and the grafting rate is related to the large reactivity of the macromonomer and the competition rate of the monomer; another One method is to achieve graft copolymerization through polymer chemical reaction, such as Li [2～3] et al. used polyethylene glycol (PEG) as a phase change material and cellulose (CELL) as a skeleton material to prepare a CELL-g-PEG copolymer through a copolymerization reaction, and found that CELL-g-PEG has a higher phase change enthalpy , the phase transition temperature is 40-60 °C, and the phase transition enthalpy and phase transition temperature are related to the PEG content and molecular weight, but the polymer chemical reaction method has the limitations of polymer chemical reaction, that is, the grafting rate is low, the phase transition enthalpy is small, And the process is complex

Images