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Method for preparing functional photothermal composite phase change heat storage material

A technology of composite phase change and heat storage materials, which is applied in the field of preparation of functional photothermal composite phase change heat storage materials, can solve the problems of poor packaging effect, poor thermal conductivity, single function, etc., and achieve simple processing and good thermal conductivity , The effect of simple process

Inactive Publication Date: 2019-10-22
BEIJING FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problems of poor thermal conductivity, poor encapsulation effect and single functionalization of existing biomass-based composite phase change materials, and to provide a functional photothermal composite phase change storage device prepared by using wood cellulose-based carbon aerogel. hot material method

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0021] (1) Take a balsa wood block with a size of 20mm×20mm×6mm, first wash it several times with acetone and deionized water, and then dry it in an oven at 105°C for 24 hours to eliminate impurities.

[0022] (2) Weigh 40gNaOH and 20.16gNaOH 2 SO 3 Dissolve in 400mL deionized water to prepare a mixed solution, and immerse the balsa wood pieces in the above mixed solution and cook for 24h.

[0023] (3) The balsa wood after cooking is taken out together with gauze, after washing with deionized water, place 30wt% H 2 o 2 Continue cooking for a period of time in the aqueous solution.

[0024] (4) Take out the treated wood block together with gauze, place it in deionized water and cook for 3 hours to remove residual H 2 o 2 , then freeze-dried for 24 hours, and the wrapped gauze was removed to obtain cellulose airgel.

[0025] (5) Place the cellulose airgel in a tube furnace, and conduct vacuum pyrolysis at a heating rate of 5°C / min to 800°C for 1 hour to prepare cellulose-b...

Embodiment 2

[0028] (1) Take a balsa wood block with a size of 20mm×20mm×3mm, first wash it several times with acetone and deionized water, and then dry it in an oven at 105°C for 24 hours to eliminate impurities.

[0029] (2) Weigh 80g NaOH and 40.32g NaOH 2 SO 3 Dissolve in 800mL deionized water to prepare a mixed solution, immerse the balsa wood block in the above mixed solution, cook for 12h, and wash several times.

[0030] (3) The balsa wood after cooking is taken out together with gauze, after washing with deionized water, place 30wt% H 2 o 2 Continue cooking for a period of time in the aqueous solution.

[0031] (4) Take out the treated wood block together with gauze, place it in deionized water and cook for 3 hours to remove residual H 2 o 2 , then freeze-dried for 24 hours, and the wrapped gauze was removed to obtain cellulose airgel.

[0032] (5) Place the cellulose airgel in a tube furnace, and conduct vacuum pyrolysis at a heating rate of 5°C / min to 800°C for 1 hour to p...

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Abstract

The invention provides a method for preparing a functional photothermal composite phase change heat storage material. A cellulose-based carbon aerogel is prepared by adopting a vacuum pyrolysis technology with a lignin and hemicellulose partially-removed balsa cellulose aerogel as a matrix, and a phase change material PEG6000 is impregnated in the cellulose-based carbon aerogel by a vacuum impregnation process. The method improves the porosity and the specific surface area of balsa wood by completely breaking a part of the cell wall structure of the wood, opening cell corners and penetrating through a part of a pit film, provides the adsorption capacity and the accommodating capacity of the phase change material by completely retaining the three-dimensional structure of the cellulose aerogel, and provides a novel green packaging material with the advantages of broad sources, low price, simplicity in processing, safeness, environmental friendliness and wide application range for the composite phase change energy storage material, and realizes photothermal conversion by using the photothermal effect of the carbon aerogel, so the functional enhancement of the composite phase change heat storage material is achieved.

Description

technical field [0001] The invention relates to a preparation method of a functional photothermal composite phase change heat storage material, which belongs to the research field of renewable energy utilization, solar thermal energy storage and photothermal conversion. Background technique [0002] The wood-based composite phase change heat storage material is to introduce biomass materials into the preparation process of composite phase change heat storage materials. The phase change material itself has a large latent heat of phase change, stable chemical properties, non-toxic and non-corrosive and renewable biomass materials. It is a new type of biomass-based composite phase change heat storage material that retains the three-dimensional grid structure of wood and endows it with heat storage and release characteristics by using physical and chemical means. [0003] Wood-based composite phase-change heat storage materials have broad application prospects in the field of bu...

Claims

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Application Information

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IPC IPC(8): C09K5/06
CPCC09K5/063
Inventor 刘士瑞孟杨宋伟杉陈瑶高建民
Owner BEIJING FORESTRY UNIVERSITY
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