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Preparation method of wood-based functional magneto-thermal composite phase change heat storage material

A technology of composite phase change and heat storage materials, which is applied in the field of solar heat storage and the preparation of composite phase change heat storage materials, can solve the problems of low thermal conductivity, poor stability of composite phase change heat storage, and single function, and achieves latent heat of phase change. High, good development prospects, the effect of expanding the pore structure

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 provide a method for preparing a wood-based functional magnetic-thermal composite phase change heat storage material for the disadvantages of poor stability, low thermal conductivity, and single function of the existing composite phase change heat storage material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Take 60g of poplar wood powder, wash it several times with acetone and deionized water, filter it, and dry it in a blast drying oven at 103±2°C for 24 hours to eliminate impurities.

[0023] (2) Weigh 40gNaOH and 20.16gNaOH 2 SO 3 Dissolve in 400mL deionized water to prepare a mixed solution, immerse poplar wood powder in the above mixed solution and cook for 8 hours, filter and wash several times, and dry to obtain modified poplar wood powder.

[0024] (3) the magnetic nano-Fe with a quality of 3g 3 o 4 The particles and 1g of sodium oleate were dissolved in 50mL of deionized water to form a stable dispersion.

[0025] (4) Add 30 g of modified poplar wood powder into the above-mentioned suspension of magnetic particles, and use a hydrothermal reaction kettle to control the temperature at 130° C. for pressure impregnation for 6 hours. After the reaction is finished, the magnetic poplar wood powder is obtained by washing and drying.

[0026] (5) Mix 100 g of mol...

Embodiment 2

[0028] (1) Take a poplar wood block with a size of 40mm×40mm×4mm, first wash it several times with acetone and deionized water, filter it, and dry it in a blast drying oven at 103±2°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 poplar wood blocks in the above mixed solution and cook for 10 hours, wash several times, and dry to obtain modified poplar wood blocks.

[0030] (3) the magnetic nano-Fe with a quality of 50g 3 o 4 The particles and 10 g of sodium oleate were placed in 500 mL of deionized water to form a stable dispersion.

[0031] (4) Add the modified poplar wood block to the above-mentioned magnetic particle suspension, and use a hydrothermal reaction kettle to control the temperature at 130°C for pressure impregnation for 8 hours. After the reaction is finished, the magnetic poplar wood block is obtained by washing and drying.

[0032] (5) Immerse...

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Abstract

The invention provides a preparation method of a wood-based functional magneto-thermal composite phase change heat storage material. Magnetic Fe3O4 particles are anchored to the surface of a poplar fiber matrix through a hydrothermal process by using hemicellulose and lignin partially-removed poplar fiber as a matrix, and a phase change material is impregnated in the poplar fiber matrix by a vacuum impregnation process. The method improves the anchoring ability of the poplar fiber matrix to the magnetic Fe3O4 particles and the ability of the matrix to accommodate the phase change material by removing hemicellulose and lignin from poplar, releasing a part of active hydroxyl groups and expanding the pore structure of the poplar fiber, provides the novel green packaging material with the advantages of wide sources, low price, simplicity in processing, safety, environmental protection and wide application range for the phase change material, realizes magneto-thermal conversion by using themagneto-thermal effect of the magnetic Fe3O4 particles, realizes the functional enhancement of the composite phase change heat storage material, and develops new direction for magneto-thermal utilization.

Description

technical field [0001] The invention relates to a preparation method of a wood-based functional magnetic-thermal composite phase-change heat storage material, which belongs to the technical field of solar heat storage and preparation of composite phase-change heat storage materials. Background technique [0002] Wood-based composite phase-change heat storage materials refer to macroscopic wood entities (mostly sawn timber) as matrix materials, using the unique pore structure of wood and the chemical reactivity of the main components of wood, cellulose, hemicellulose and lignin, through physical And chemical means, a new type of biomass-based composite phase change heat storage material that retains the solid structure of wood and gives it heat storage and release characteristics. [0003] Wood-based composite phase change heat storage materials have broad application prospects in the field of building energy conservation. At present, the functions of phase change heat stora...

Claims

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Application Information

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Patent Type & Authority Applications(China)
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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