A kind of chitosan-g-fatty acid phase change material and its preparation method and application

Abstract

A chitosan-g-aliphatic acid phase-change material, a preparing method thereof and applications of the material are disclosed. The method includes dissolving chitosan into an aqueous acetic acid solution; precipitating the chitosan in a high-speed shearing coagulating bath to obtain chitosan subjected to ultra-micro pretreatment; dispersing anatase type nanometer titanium dioxide into a melt liquid of aliphatic acid under ultrasonic wave functions; adding the chitosan subjected to ultra-micro pretreatment into the liquid; reacting the mixture under vacuumizing conditions for 1 h; and washing a product with absolute ethanol to obtain the phase-change material. By adding the anatase type nanometer titanium dioxide in a preparing process of the phase-change material, crystallization heat release of chitosan-g-aliphatic acid in a cooling process can be promoted. The method is green, clean, and free of environment pollution. The graft polymer of this series is safe and nontoxic to human bodies and environment, is biodegradable and has good application prospects in the fields of heat-storage temperature-adjusting textiles, space suits, diving suits, high-grade sportswear, and the like.

Description

Technical field [0001] The invention relates to a chitosan-g-fatty acid phase change material and a preparation method and application thereof, belonging to the field of materials science. Background technique [0002] Phase change materials are classified according to phase change methods, mainly including solid-liquid and solid-solid two types. Solid-solid phase change materials are mainly divided into inorganic salts, polyols and polymers. Polymer solid-solid phase Variable materials have the advantages of long service life, stable performance, no overcooling and chromatographic phenomena, good mechanical properties of materials, and easy processing. [0003] Chitosan is the product obtained after the deacetylation of chitin. The annual natural production of chitin on the earth is as high as tens of billions of tons. Its reserve in nature is second only to cellulose. Chitosan has good biocompatibility. It is highly biodegradable, and its derivatives have good development prospe...

AI Technical Summary

Problems solved by technology

[0004] The preparation of solid-solid phase change materials by graft copolymerization is to graft the chain end of the long chain of crystalline molecules on another skeleton polymer with high melting point, high strength and stable structure through chemical reaction. During the heating process, When the low-melting point crystalline molecular branch chain undergoes a phase transition from crystalline to amorphous state, the macroscopic flow of low-melting point molecules is restricted because the molecular main chain has not yet melted, and the overall solid state of the material is maintained, thereby achieving solid-state phase transition However, the solid-solid phase change materials prepared by graft copolymerization often have serious crystallization supercooling phenomenon during the cooling process, that is, the side chain crystallization is limited, and the crystallization and heat release cannot be smoothly performed during the cooling process, thus limiting Its application value as a phase change material