Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A chitosan-g-aliphatic acid phase-change material, a preparing method thereof and applications of the material

A phase change material, chitosan technology, applied in the field of material science, can solve the problems of limiting the application value of phase change materials, unable to crystallize smoothly, exothermic heat, and limited side chain crystallization, so as to achieve good application prospects and solve side chain crystallization Supercooling phenomenon, safe and non-toxic effect on human body and environment

Inactive Publication Date: 2017-06-20
DALIAN POLYTECHNIC UNIVERSITY
View PDF2 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Step 1: dissolving chitosan in an aqueous acetic acid solution with a mass percentage concentration of 3% is prepared as a chitosan solution with a mass percentage concentration of 1.5%;

[0023] Step 2: prepare a coagulation bath according to the ratio of ethanol mass percentage concentration of 50%, NaOH mass percentage concentration of 5%, and distilled water mass percentage of 45%;

[0024] Step 3: The coagulation bath obtained in step 2 is subjected to a high-speed shear of 4000 rpm, and the chitosan solution obtained in step 1 is added to it at the same time, and the high-speed shear is stopped after 5 minutes, and the above-mentioned coagulation containing chitosan is Bath is packed into centrifuge tube, carries out 20 minutes high-speed centrifugation of 10000 rev / mins, collects the chitosan solid that separates out;

[0025] Step 4: fully wash the ultramicronized pretreated chitosan obtained through step 3 with absolute ethanol;

[0026] Step 5: dispersing ana...

Embodiment 2

[0030] Step 1: dissolving chitosan in an aqueous acetic acid solution with a mass percentage concentration of 3% is prepared into a chitosan solution with a mass percentage concentration of 2%;

[0031] Step 2: prepare a coagulation bath according to the ratio of ethanol mass percentage concentration of 50%, NaOH mass percentage concentration of 5%, and distilled water mass percentage of 45%;

[0032] Step 3: The coagulation bath obtained in step 2 is subjected to a high-speed shear of 5000 rpm, and the chitosan solution obtained in step 1 is added to it at the same time, and the high-speed shear is stopped after 7 minutes, and the coagulation bath containing chitosan is packed Put into centrifuge tube, carry out 15 minutes high-speed centrifugation of 7000 rev / mins, collect the chitosan solid that separates out;

[0033] Step 4: fully clean the ultramicronized pretreated chitosan obtained by step 3 with absolute ethanol;

[0034] Step 5: dispersing anatase-type nano-titanium...

Embodiment 3

[0038] Step 1: dissolving chitosan in an aqueous acetic acid solution with a mass percentage concentration of 3% is prepared into a chitosan solution with a mass percentage concentration of 3%;

[0039] Step 2: prepare a coagulation bath according to the ratio of ethanol mass percentage concentration of 50%, NaOH mass percentage concentration of 5%, and distilled water mass percentage of 45%;

[0040] Step 3: The coagulation bath obtained in step 2 is subjected to a high-speed shear of 5000 rpm, and the chitosan solution obtained in step 1 is added to it at the same time, and the high-speed shear is stopped after 10 minutes, and the above-mentioned coagulation containing chitosan is Bath is packed into centrifuge tube, carries out 10 minutes high-speed centrifugation of 5000 rev / mins, collects the chitosan solid that separates out;

[0041] Step 4: fully wash the ultramicronized pretreated chitosan obtained through step 3 with absolute ethanol;

[0042] Step 5: dispersing ana...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
phase transition temperatureaaaaaaaaaa
Login to View More

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 material science. Background technique [0002] According to the phase change mode, phase change materials are mainly divided into two types: solid-liquid and solid-solid. Solid-solid phase change materials are mainly divided into inorganic salts, polyols and polymers. Polymer solid-solid phase The variable material has the advantages of long service life, stable performance, no supercooling and chromatography, good mechanical properties of the material, and easy processing. [0003] Chitosan is the product obtained after deacetylation of chitin. The annual natural production of chitin on the earth is as high as tens of billions of tons. Its storage in nature is second only to cellulose. Chitosan has good biocompatibility Sexuality and biodegradability, its derivatives have good development prospects. [0...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C08L5/08C08K3/22C09K5/02C08B37/08
CPCC08B37/003C08K3/22C08K2003/2241C08K2201/011C08L2201/06C08L2203/02C08L2203/12C09K5/02C08L5/08
Inventor 魏菊卢松佳郑来久钱永芳
Owner DALIAN POLYTECHNIC UNIVERSITY
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products