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GN@cellulose based solid-solid phase change material and preparation method and application thereof

A phase change material, cellulose-based technology, applied in heat exchange materials, fiber chemical characteristics, chemical instruments and methods, etc., can solve the problem of low thermal conductivity of cellulose polymer phase change materials and flexibility of graphene-based phase change materials It is not suitable for secondary processing and molding, and achieves the effects of narrow phase transition temperature range, excellent thermal cycle stability, structural controllability, and improved sensitivity

Active Publication Date: 2020-01-17
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

Method used

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  • GN@cellulose based solid-solid phase change material and preparation method and application thereof
  • GN@cellulose based solid-solid phase change material and preparation method and application thereof
  • GN@cellulose based solid-solid phase change material and preparation method and application thereof

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preparation example Construction

[0039] The present invention also provides a preparation method of GN@cellulose-based solid-solid phase change material (referred to as the method), which is characterized in that the method includes the following steps:

[0040] (1) Cellulose dissolution: stirring and dissolving the dried cellulose in solvent A at a temperature of 65-95° C. to obtain a cellulose solution with a mass fraction of 5-15 wt %;

[0041] In step 1), the cellulose is microcrystalline cellulose, cotton pulp, cotton linters, cotton, wood pulp, bamboo pulp, cellulose filter paper or absorbent cotton;

[0042] The solvent A is a solvent capable of dissolving cellulose, specifically a mixed solution of paraformaldehyde (PF) / dimethyl sulfoxide (DMSO), a mixed solution of lithium chloride / N,N-dimethylformamide or Ionic liquid; in the mixed solution of paraformaldehyde and dimethyl sulfoxide, the mass ratio of paraformaldehyde and dimethyl sulfoxide is 1: (8~12); lithium chloride and N,N-dimethylformaldehyde...

Embodiment 1

[0065] 1) Dry the microcrystalline cellulose in a vacuum oven at 60°C for 12 hours; take the dried microcrystalline cellulose and dissolve it in dimethyl sulfoxide / paraformaldehyde (DMSO / PF) (the mass ratio of DMSO to PF is 12:1), the concentration of microcrystalline cellulose is 8wt.%, mechanically stirred at 95°C until it becomes a homogeneous system to obtain a cellulose solution;

[0066] 2) The cellulose solution is cooled to room temperature, and 2-bromopropionyl bromide is added dropwise to the cellulose solution in an ice-water bath to react, wherein the molar ratio of hydroxyl and 2-bromopropionyl bromide in the cellulose unit ring is 1:3; after the dropwise addition, place it at room temperature for 3 hours; then heat it to 50°C for 2 hours; cool the product to room temperature, add distilled water to remove unreacted raw materials and by-products, and repeatedly wash and filter to obtain the crude product; The crude product was heated and dissolved in acetone, and ...

Embodiment 2

[0075] 1) Dry the cotton fiber in a vacuum oven at 60°C for 12 hours; take the dried cotton fiber and dissolve it in 1-allyl-3-methylimidazolium chloride (AmimCl) solution, the concentration of the cotton fiber is 9wt. %, stir mechanically at 95°C until it becomes a homogeneous system to obtain a cellulose solution;

[0076] 2) Cool the cellulose solution to room temperature, and add 2-bromoisobutyryl bromide dropwise to the cellulose solution in an ice-water bath to react, wherein the molar ratio of the hydroxyl group in the cellulose unit ring to 2-bromoisobutyryl The ratio is 1:4; after the dropwise addition, put it at room temperature to react for 3 hours; then heat it to 50°C for 2 hours; cool the product to room temperature, add distilled water to remove unreacted raw materials and by-products, wash and filter repeatedly to obtain the crude product; The crude product was heated and dissolved in acetone, and distilled water was added for recrystallization and purification...

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Abstract

The invention discloses a GN@cellulose based solid-solid phase change material and a preparation method and application thereof. The method comprises the following steps of (1) dissolving cellulose; (2) carrying out homogeneous phase grafting modification: reacting a halogenated acyl halide monomer with cellulose to obtain cellulose ester; (3) carrying out ATRP method reaction: uniformly dispersing the cellulose ester, GN and a solvent B obtained in Step (2), and then adding a ligand, a catalyst and alkyl acrylate to react to obtain a reaction mixture; and (4) carrying out purification: purifying the reaction mixture obtained in Step (3) to obtain a GN@cellulose-g-polyalkylacrylate copolymer. The copolymer is subjected to melt extrusion spinning to obtain a solid-solid phase change fiber.The copolymer is is subjected to electrostatic spinning to obtain a film. According to the method, cellulose fibers are used as a substrate, halogen functional groups are grafted through an acylationreaction, alkyl acrylate is grafted on a cellulose skeleton through ATRP, graphene is used as a reinforcing material, and later-stage processing is not needed, so that the fibers with flexibility, high thermal conductivity and high enthalpy value are prepared, and secondary processing is facilitated.

Description

technical field [0001] The invention belongs to the technical field of phase change materials, in particular to a GN@cellulose-based solid-solid phase change material and its preparation method and application. Background technique [0002] With the environmental problems caused 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. Phase change energy storage material (PCM) is just a kind of functional material that can realize the effective recovery and utilization of heat energy. [0003] A phase-change energy storage material is a substance that can change from one state to another at a certain temperature, and the molecules of the substance rapidly change from order to disorder (and vice versa), accompanied by absorption Thermal and exothermic phenomena. At present, liquid-solid phase change materials are the most commonly used, but the liquid ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F251/02C08F220/18C08K3/04C09K5/02D01F6/52C08J5/18C08L51/02
CPCC08F251/02C08K3/042C09K5/02D01F6/52C08J5/18C08J2351/02C08F2438/01Y02P20/54
Inventor 韩娜钱勇强张兴祥李伟张总宣
Owner TIANJIN POLYTECHNIC UNIV
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