A method and application for preparing gn@cellulose-based solid-solid phase change fibers in different phases

A technology of cellulose fiber and phase change fiber, which is applied in plant fiber, fiber treatment, chemical instruments and methods, etc., can solve the problem that the flexibility of graphene-based phase change materials is not suitable for secondary processing and the heat conduction of cellulose polymer phase change materials Low stability, incapable of energy storage and diffusion, etc., to achieve excellent thermal cycle stability and structural controllability, narrow phase transition temperature range, and less defects

Active Publication Date: 2022-07-26
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] For phase change materials as clean and recyclable materials, there are still many defects and deficiencies in technologies such as textiles, building materials, and solar thermal storage. For example, the thermal conductivity of cellulose polymer phase change materials is low, and graphene-based Phase change materials are flexible and not suitable for secondary processing and molding after preparation
The document with the application number 201510006086.3 discloses a cellulose-g-polyethylene glycol n-alkyl ether phase change material whose side chains are different alkyl chains. The process will lead to heat accumulation, unable to store and dissipate energy in time

Method used

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  • A method and application for preparing gn@cellulose-based solid-solid phase change fibers in different phases
  • A method and application for preparing gn@cellulose-based solid-solid phase change fibers in different phases
  • A method and application for preparing gn@cellulose-based solid-solid phase change fibers in different phases

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] 1) Dry the cotton pulp in a vacuum drying oven at 60° C. for 12 hours; take the dried cotton pulp and disperse it in DMF at a temperature of 65° C. to obtain a cellulose fiber dispersion with a mass fraction of 8 wt %;

[0047] 2) The cellulose fiber dispersion is cooled to room temperature, and 2-bromopropionyl bromide is added dropwise to the cellulose fiber dispersion in an ice-water bath to react with cellulose, and the 2-bromopropionyl bromide and the cellulose unit ring The molar ratio of the hydroxyl groups is 3:1; after the dropwise addition is completed, the reaction is placed at room temperature for 3 hours; then heated to 50 °C for 2 hours; after the reaction is completed, the product is cooled to room temperature, and distilled water is added to remove unreacted raw materials and by-products, After suction filtration, rinsed repeatedly to obtain a white solid; then vacuum-dried at 50° C. to obtain a white solid product, cellulose bromopropionate, with a yield...

Embodiment 2

[0054] 1) drying the bamboo pulp in a vacuum drying oven at 60°C for 12h; taking the dried bamboo pulp and dispersing it in DMSO at a temperature of 80°C to obtain a cellulose fiber dispersion with a mass fraction of 10wt%;

[0055] 2) The cellulose fiber dispersion is cooled to room temperature, and 2-iodopropionyl bromide is added dropwise to the cellulose fiber dispersion in an ice-water bath to react with cellulose, and the 2-iodopropionyl bromide and the cellulose unit ring. The molar ratio of the middle hydroxyl group is 5:1; after the dropwise addition, the reaction is placed at room temperature for 2 hours; then heated to 50 °C for 6 hours; after the reaction is completed, the product is cooled to room temperature, and distilled water is added to remove unreacted raw materials and by-products, After suction filtration, rinsed repeatedly to obtain a white solid; then vacuum-dried at 60° C. to obtain a white solid product, cellulose iodopropionate, with a yield of 93%;

...

Embodiment 3

[0061] 1) Dry the cotton linters in a vacuum drying oven at 90°C for 12 hours; take the dried cotton linters and stir and disperse them in DMAC at a temperature of 80°C to obtain a cellulose fiber dispersion with a mass fraction of 9 wt%;

[0062] 2) The cellulose fiber dispersion is cooled to room temperature, and in an ice-water bath, 2-chloropropionyl bromide is added dropwise to the cellulose fiber dispersion to react with cellulose, wherein 2-chloropropionyl bromide and cellulose units The molar ratio of hydroxyl groups in the ring is 6:1; when the dropwise addition is completed, the reaction mixture is placed at room temperature for 4 hours; then heated to 50°C for 3 hours; after the reaction is completed, the product is cooled to room temperature, and distilled water is added to remove unreacted raw materials and by-products, and repeatedly rinsed after suction filtration to obtain a white solid; the obtained product was vacuum-dried at 60 °C to obtain a white solid prod...

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Abstract

The invention discloses a method and application for preparing GN@cellulose-based solid-solid phase change fibers in different phases. The method includes: (1) cellulose fiber dispersion; (2) surface graft modification: reacting halogenated acid halide monomers with cellulose to obtain cellulose ester; (3) SI-ATRP method reaction: step 2) After the obtained cellulose ester, GN and solvent B are uniformly dispersed, a ligand, a catalyst and an alkyl acrylate are added to react to obtain a reaction mixture; (4) purification: after purifying the reaction mixture obtained in step 3), GN@cellulose- g-Polyalkylacrylate solid-solid phase change fiber. The fiber is pressed into a film to obtain a film. In this method, cellulose fibers are used as the matrix, halogen functional groups are grafted through an acylation reaction, and alkyl acrylates are directly grafted on the surface of the modified cellulose fibers through SI-ATRP without changing the structure of the cellulose fibers. For reinforcing materials, fibers with flexibility, high thermal conductivity and high enthalpy value are prepared without post-processing, which is conducive to secondary processing.

Description

technical field [0001] The invention belongs to the technical field of phase change materials, in particular to a method and application for preparing GN@cellulose-based solid-solid phase change fibers in different phases. Background technique [0002] With the environmental problems brought about by the consumption of resources, how to make good use of renewable and degradable resources and energy is one of the most effective ways to solve environmental and energy problems. The phase change energy storage material (PCM) is a functional material that can effectively recycle thermal energy. [0003] A phase change energy storage material is a substance that can change from one state to another at a specific temperature, and the molecules of the substance rapidly change from order to disorder (and vice versa), accompanied by adsorption. Phenomena of heat and exotherm. At present, liquid-solid phase change materials are the most commonly used, but a liquid phase is generated ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D06M15/263C09K5/14D06M101/06
CPCD06M15/263C09K5/14D06M2101/06
Inventor 韩娜钱勇强张兴祥李伟张总宣
Owner TIANJIN POLYTECHNIC UNIV
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