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Process for preparing compound forming phase changing material of polyethyldiol/silicon dioxide

A shape-setting phase change material, polyethylene glycol technology, applied in chemical instruments and methods, heat exchange materials, etc., can solve the problems of easy crushing of porous substrates, deformation and shapeability, high porosity, etc., to achieve large latent heat, Good setting performance and uniform dispersion of components

Inactive Publication Date: 2006-06-28
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Organic polymers such as high-density polyethylene (HDPE), thermoplastic elastomer styrene-butadiene triblock copolymer (SBS), etc., have the advantages of good shapeability and easy processing; when used for a long time, there are mainly material aging, work Problems such as phase separation between substance and matrix; inorganic matrix such as expanded graphite has high porosity and low density, and the prepared inorganic / organic composite shape-changing material has the characteristics of good thermal conductivity and high energy storage density, but it is porous under pressure The matrix is ​​easy to be crushed, deformed and poorly set, etc.

Method used

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  • Process for preparing compound forming phase changing material of polyethyldiol/silicon dioxide
  • Process for preparing compound forming phase changing material of polyethyldiol/silicon dioxide
  • Process for preparing compound forming phase changing material of polyethyldiol/silicon dioxide

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Steps: (1) At room temperature, in a 1.5L glass beaker, add 500g of 20% silica sol (pH value = 9), and slowly add polyethylene glycol (PEG5000 / PEG10000 = 1 / 2) under vigorous stirring by a CNC mixer 400g of powder, after the polyethylene glycol powder is completely dissolved, slowly add 1% aluminum sulfate solution dropwise according to the ratio of 0.01‰ of the total amount of composite phase-change and shape-setting materials, and continue stirring until all gels are formed. Transfer the beaker containing the gel into a blast drying oven, dry at a constant temperature of 80°C for 36 hours, cool to room temperature, take out the dried gel, mash it in a mortar, transfer it to a beaker, and stir it vigorously to obtain Powder. (2) Transfer the powder into a 1L four-necked flask equipped with a stirrer, nitrogen tube, reflux tube, and dropping funnel, and vacuumize at 40°C for 3 hours while stirring, then heat the oil bath to 90°C, and open the water condensation return pi...

Embodiment 2

[0038] Steps: (1) In a 1.5L glass beaker, add 600g of 15% silica sol (pH = 8), and slowly add 360g of polyethylene glycol (PEG5000 / PEG10000 = 1 / 1) powder under vigorous stirring by a CNC mixer, After the polyethylene glycol powder is completely dissolved, slowly add 0.1M acetic acid dropwise at a rate of 0.05‰ of the total amount of the composite phase-change shape-setting material, and continue stirring until all gels are formed. Transfer the beaker containing the gel into a blast drying oven, dry at a constant temperature of 80°C for 48 hours, cool to room temperature, take out the dried gel, mash it in a mortar, transfer it to a beaker, and stir it vigorously to obtain Powder;

[0039] (2) Transfer the powder into a 1L four-necked flask equipped with a stirrer, nitrogen tube, reflux tube, and dropping funnel, and vacuumize at 40°C for 3 hours while stirring, then heat the oil bath to 90°C, and open the water condensation return pipe , Nitrogen protection, according to the ...

Embodiment 3

[0041] Steps: (1) at room temperature, in a 1.5L glass beaker, add 500g of 30% silica sol (pH value=8.5), and slowly add polyethylene glycol ((PEG3000 / PEG15000=1 / 2 )) powder 350g, after the polyethylene glycol powder is completely dissolved, slowly add 1% calcium chloride solution dropwise according to the ratio of 0.03‰ of the total amount of the composite phase change shape-setting material, and continue to stir until it is completely gelled. Transfer the beaker containing the gel into a blast drying oven, dry at a constant temperature of 80°C for 24 hours, cool to room temperature, take out the dried gel, mash it in a mortar, transfer it to a beaker, and stir it vigorously to obtain Powder.

[0042] (2) Transfer the powder into a 1L four-necked flask equipped with a stirrer, nitrogen tube, reflux tube, and dropping funnel, and vacuumize at 40°C for 3 hours while stirring, then heat the oil bath to 90°C, and open the water condensation return pipe , nitrogen protection, acc...

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Abstract

The invention offers polyethylene glycol / silicon dioxide composite forming phase-change material manufacturing method. It includes the following steps: adding polyethylene glycol flour body into silica sol, and dipping accelerating agent to happen sol-gel reaction to form three-dimensional network gel; drying, smashing to form flour body; removing water and adding modifier. The formed product has high latent heat of phase change 60-140 kJ / kg, good forming capability, and stable capability while temperature is higher than phase-change by 20-50 centigrade degree, the polyethylene glycol does not leak out; thus it can be applied to electronic component thermal adjusting and controlling material, heat storage tempering textile goods, and building energy conservation wall body fields, and so on.

Description

technical field [0001] The invention relates to thermal energy storage and utilization materials, in particular to a preparation method of polyethylene glycol / silicon dioxide composite shape-changing 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 undergo solid-liquid transformation during melting, so they need to be packaged in special containers, which not only increases the cost, but also increases the thermal resistance between the heat transfer medium and the phase change material, thereby reducing heat exchange efficiency. Shape-setting phase change materials are one of the most effective ways to solve the above problems. The shape-setting phase chan...

Claims

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Application Information

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IPC IPC(8): C09K5/06
Inventor 方玉堂王维龙杨晓西高学农丁静
Owner SOUTH CHINA UNIV OF TECH
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