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A kind of gn@cellulose-based solid-solid phase change material and its preparation method and application

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 fast heating rate

Active Publication Date: 2022-07-12
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • A kind of gn@cellulose-based solid-solid phase change material and its preparation method and application
  • A kind of gn@cellulose-based solid-solid phase change material and its preparation method and application
  • A kind of gn@cellulose-based solid-solid phase change material and its preparation method and application

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preparation example Construction

[0039] The present invention also provides a preparation method (method for short) of a GN@cellulose-based solid-solid phase change material, characterized in that the method comprises the following steps:

[0040] (1) Cellulose dissolution: the dried cellulose is stirred and dissolved in the solvent A at a temperature of 65 to 95° C. to obtain a cellulose solution with a mass fraction of 5 to 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-dimethyl sulfoxide In th...

Embodiment 1

[0066] 1) Dry the microcrystalline cellulose in a vacuum drying 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 In 12:1), the concentration of microcrystalline cellulose is 8 wt.%, and mechanical stirring is performed at 95° C. until it becomes a homogeneous system to obtain a cellulose solution;

[0067] 2) The cellulose solution is cooled to room temperature, and in an ice-water bath, 2-bromopropionyl bromide is added dropwise to the cellulose solution to react, wherein the mol ratio of hydroxyl and 2-bromopropionyl bromide in the cellulose unit ring is 1:3; after the dropwise addition, it was placed at room temperature for 3 hours; then heated to 50°C for 2 hours; the product was cooled to room temperature, distilled water was added to remove unreacted raw materials and by-products, and the crude product was obtained by repeated rinsing and suction filtratio...

Embodiment 2

[0076] 1) Dry the cotton fiber in a vacuum drying oven at 60°C for 12 h; take the dried cotton fiber and dissolve it in 1-allyl-3-methylimidazolium chloride (AmimCl) solution, and the concentration of the cotton fiber is 9wt. %, mechanically stirred at 95°C until a homogeneous system was obtained to obtain a cellulose solution;

[0077] 2) The cellulose solution is cooled to room temperature, and 2-bromoisobutyryl bromide is added dropwise to the cellulose solution in an ice-water bath to react, wherein the mol ratio of hydroxyl and 2-bromoisobutyryl in the cellulose unit ring The ratio is 1:4; after the dropwise addition, the reaction is placed at room temperature for 3 hours; then heated to 50°C for 2 hours; the product is cooled to room temperature, distilled water is added to remove unreacted raw materials and by-products, and the crude product is obtained by repeated washing and suction filtration; The crude product was heated and dissolved in acetone, and distilled water...

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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 includes: (1) dissolving cellulose; (2) homogeneous graft modification: reacting halogenated acid halide monomers with cellulose to obtain cellulose ester; (3) ATRP reaction: reacting the obtained cellulose ester in step 2). After the cellulose ester, GN and solvent B are uniformly dispersed, add ligand, catalyst and alkyl acrylate to react to obtain a reaction mixture; (4) purification: after purifying the reaction mixture obtained in step 3), GN@cellulose-g- Polyalkylacrylate copolymer. The copolymer is melt extruded and spun to obtain solid-solid phase change fibers. The copolymer was electrospun to obtain a film. In this method, cellulose fiber is used as the matrix, halogen functional groups are grafted through acylation reaction, and alkyl acrylate is grafted on the cellulose skeleton through ATRP, and graphene is used as reinforcing material to prepare flexible and high thermal conductivity without post-processing. , Fiber with high enthalpy value, 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 GN@cellulose-based solid-solid phase change material and a preparation method and application thereof. 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 during...

Claims

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Application Information

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Patent Type & Authority Patents(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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