Polyethylene glycol wood powder composite phase change material (PCM) and preparation method and applications thereof

A polyethylene glycol and composite phase change technology, applied in heat exchange materials, chemical instruments and methods, etc., can solve the problems of increasing thermal resistance, reducing PEG phase change enthalpy, high injection molding processing temperature, etc., to achieve the goal of reducing usage Effect

Active Publication Date: 2019-05-31
SOUTH CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In its preparation method, wood flour and PEG are physically blended and adsorbed, and an additional silicone cross-linking agent is needed for cross-linking, and then coated with polyethylene glycol-isocyanate copolymer resin, and finally PVC plastic powder is added to knead and shape to obtain a phase. In the preparation process, in addition to wood powder, a large amount of plastics, isocyanate and various additives are added in order to set the shape, thereby greatly reducing the phase transition enthalpy of PEG, and the addition of plastics will also increase thermal resistance.
In addition, the preparation method has many steps, up to five steps, and the injection molding processing temperature is relatively high, which needs to be heated up to a high temperature of 185°C, which consumes a lot of energy.

Method used

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  • Polyethylene glycol wood powder composite phase change material (PCM) and preparation method and applications thereof
  • Polyethylene glycol wood powder composite phase change material (PCM) and preparation method and applications thereof
  • Polyethylene glycol wood powder composite phase change material (PCM) and preparation method and applications thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Heat polyethylene glycol with an average molecular weight of 15,000 to 80°C to melt, then add wood powder to the melted polyethylene glycol under vigorous stirring at a speed of 3,000r / min, and stir for 60 minutes under heating at 80°C to mix evenly. Finally, the sample was placed in a vacuum oven with a temperature of 80°C and a pressure of -85KPa for vacuum adsorption for 24 hours to obtain a polyethylene glycol wood powder composite phase change energy storage material. Wherein the wood powder is superfine pine wood powder with an average particle size of 16 μm and a mass content of 35% in the phase change material.

Embodiment 2

[0029] Heat polyethylene glycol with an average molecular mass of 10,000 to 85°C to melt, then add wood powder to the melted polyethylene glycol under vigorous stirring at a speed of 2,000r / min, and stir for 30 minutes under heating at 85°C to mix evenly. Finally, the sample was placed in a vacuum oven with a temperature of 85° C. and a pressure of -85 KPa for vacuum adsorption for 23 hours to obtain a polyethylene glycol wood powder composite phase change energy storage material. Wherein the wood powder is pine wood powder fiber with an average particle size of 10 μm and a mass content of 30% in the phase change material.

Embodiment 3

[0031] Heat polyethylene glycol with an average molecular weight of 8000 to 80°C to melt, then add wood powder to the melted polyethylene glycol under vigorous stirring at a speed of 3000r / min, stir for 45 minutes under heating at 85°C, and mix well. Finally, the sample was placed in a vacuum oven with a temperature of 85°C and a pressure of -85KPa for vacuum adsorption for 22 hours to obtain a polyethylene glycol wood powder composite phase change energy storage material. Wherein the wood powder is superfine poplar wood powder with an average particle size of 15 μm and a mass content of 25% in the phase change material.

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Abstract

The invention belongs to the technical field of biology based phase change materials, and especially relates to a polyethylene glycol wood powder composite phase change material (PCM) and a preparation method and applications thereof. The polyethylene glycol wood powder composite phase change material (PCM) is composed of polyethylene glycol and wood powder. The preparation method comprises following steps: heating and melting polyethylene glycol, adding wood powder into melted polyethylene glycol under stirring, evenly mixing under heating and stirring, and finally subjecting the mixture to vacuum adsorption to obtain the polyethylene glycol wood powder composite phase change material. Waste leftover materials in the wood industry are processed to obtain ultrafine wood powder and wood fibers, which are used to prepare the phase change material; natural renewable biological resources are used to prepare the phase change material; the wastes are recovered and reutilized; and the using amount of nonrenewable fossil resources and mineral resources is reduced in phase change material preparation. The prepared phase change material has the advantages of high enthalpy change value and good heat stability.

Description

technical field [0001] The invention belongs to the technical field of bio-based phase-change energy storage materials, in particular to a polyethylene glycol wood powder composite phase-change energy storage material and its preparation method and application. Background technique [0002] A phase change energy storage material (PCM, phase change material) refers to a substance that absorbs or releases phase change heat in the process of biological phase transformation, thereby storing energy and regulating and controlling the ambient temperature. According to the phase transition form, it is generally divided into four types: solid-solid phase transition, solid-liquid phase transition, liquid-gas phase transition and solid-gas phase transition. According to the performance of phase change materials, they are mainly divided into three categories: inorganic phase change materials, organic phase change materials and composite phase change materials. Inorganic phase change ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06
Inventor 袁腾李仁普梁斌杨卓鸿冯业昌
Owner SOUTH CHINA AGRI UNIV
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