Method for preparing polyethylene glycol and epoxy resin formed composite phase-change materials

A composite phase-change material and epoxy resin technology, applied in the direction of heat exchange materials, chemical instruments and methods, etc., can solve the problems of influence and difficulty in uniformly dispersing the thermal properties of polyethylene glycol, and achieve high stability and energy storage Good effect, good setting performance

Inactive Publication Date: 2008-07-30
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention aims at the problems existing in the melting process of existing phase change materials, such as difficulty in uniform dispersion and impact on thermal properties of polyethylene gly

Method used

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  • Method for preparing polyethylene glycol and epoxy resin formed composite phase-change materials
  • Method for preparing polyethylene glycol and epoxy resin formed composite phase-change materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] At room temperature, in a 1.5L Erlenmeyer flask, add 200g of grade E51 epoxy resin liquid with an epoxy value of 0.6, and slowly add polyethylene glycol (PEG4000 / PEG8000=1 / 1) powder under vigorous stirring with a CNC mixer 900g, after it is completely dissolved and evenly dispersed with EP, add the mixed solution of 40% D230 curing agent and 10% DMP-30 accelerator respectively accounting for the amount of EP, and keep stirring until all are mixed evenly. Degas the reaction mixture under vacuum. When there are no more bubbles in the reaction liquid, pour it into a preheated mold coated with a release agent, transfer the mold to a 60°C oven for solidification and molding for 48 hours, and cool Demoulding at room temperature to obtain a fixed composite phase change material.

[0023] The thermomechanical analysis of the above composite phase change material is shown in Figure 1: For the polyethylene glycol sample, phase transition occurs during the thermal melting process,...

Embodiment 2

[0029] At room temperature, in a 1L Erlenmeyer flask, add 100g of E44 epoxy resin liquid with an epoxy value of 0.3, and slowly add 100g of polyethylene glycol (PEG4000 / PEG10000=1 / 1) powder under vigorous stirring by a CNC mixer , after it is completely dissolved and evenly dispersed with EP, add the mixed solution of 8% D230 curing agent and 1% DMP-30 accelerator respectively accounting for the amount of EP, and keep stirring until all are mixed evenly. Degas the reaction mixture under vacuum. When there are no more air bubbles in the reaction liquid, pour it into a preheated mold coated with a release agent, transfer the mold to a 60°C oven for solidification and molding for 24 hours, and cool Demoulding at room temperature to obtain a fixed composite phase change material.

Embodiment 3

[0031]At room temperature, in a 1.5L Erlenmeyer flask, add 100g of epoxy resin liquid with grade E31 and an epoxy value of 0.5, and slowly add polyethylene glycol (PEG4000 / PEG8000=1 / 1) powder under vigorous stirring by a CNC mixer 500g, after it is completely dissolved and evenly dispersed with EP, add the mixed solution of 30% D230 curing agent and 5% DMP-30 accelerator respectively accounting for the amount of EP, and keep stirring until all are mixed evenly. Degas the reaction mixture under vacuum. When there are no more bubbles in the reaction liquid, pour it into a preheated mold coated with a release agent, transfer the mold to a 60°C oven for solidification and molding for 36 hours, and cool Demoulding at room temperature to obtain a fixed composite phase change material.

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Abstract

The invention discloses a preparation method of polyethylene glycol and epoxy resin shaping composite phase change material. The invention includes the following steps of (1) adding polyethylene glycol and epoxy resin into a reaction container, adding the mixture liquid of firming agent and accelerant after polyethylene glycol is completely dissolved and is dispersed evenly with the epoxy resin; (2) defoaming the mixture obtained from step (1) in vaccum, pouring the mixture into a die applied with parting agent, transferring the die into an oven for solidification and moulding for 24-48 hours, then cooling the die until demoulding. The materials proportions are that epoxy resin condensate is 10 to 50 percent, polyethyleneglycol is 50 to 90 percent; the contents of the firming agent and the accelerant respectively account for 8 to 40 percent and 1 to10 percent of the epoxy resin. The composite phase change material of the invention not only has large potential heat and excellent energy accumulating effect, but also has good figuration performance and high stability.

Description

technical field [0001] The invention relates to thermal energy storage and utilization materials, in particular to a preparation method of polyethylene glycol and epoxy resin shape-setting composite phase-change materials. Background technique [0002] Phase change materials release or absorb the latent heat of phase change during the phase transition process, so as to achieve energy storage and release and alleviate the contradiction between energy supply and demand imbalance, and have broad application prospects. Traditional phase change materials, which undergo solid-liquid transformation during melting, must be packaged in special containers, which not only increases production costs, but also reduces heat transfer efficiency. Composite modification (including physical and chemical modification) of the phase change material and the support material (skeleton), using its physical entanglement or chemical crosslinking, can make the phase change material maintain the origin...

Claims

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Application Information

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IPC IPC(8): C09K5/14C09K5/06C08L63/02C08L71/08
Inventor 方玉堂康慧英高学农张正国
Owner SOUTH CHINA UNIV OF TECH
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