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Method for improving phase transition behavior of polyethyleneglycol/terylene solid-to-solid transition material using different molecular weight polyethyleneglycol eutectic

A phase change material, polyethylene glycol technology, applied in the field of solid-solid phase change materials, can solve problems such as difficult purchase and storage of crosslinking agents, unsuitable for battery heat absorption pools, and difficult control of reaction speed, etc., to achieve stability Good, the effect of narrowing the phase change peak width and accelerating the phase change speed

Inactive Publication Date: 2009-03-18
XUZHOU COLLEGE OF INDAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, similar solid-solid phase change materials polyethylene glycol / cellulose acetate and polyethylene glycol / chitosan have been synthesized, but polyethylene glycol and chitosan solid-solid phase change materials are not suitable for battery heat absorption pools. The production cost of ethylene glycol and cellulose acetate solid-solid phase change materials is high, the catalysts and crosslinking agents used are expensive, the reaction speed is too fast, it is difficult to control, and it is easy to form body-shaped molecules, causing great environmental pollution. Crosslinking agents are difficult to obtain in the market. buy and save

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Firstly, the polyethylene glycol with a molecular weight of 4000, the polyethylene glycol with a molecular weight of 20000, the polyester yarn with a molecular weight of 15000, and the crosslinking agent phthalic anhydride are dried for later use.

[0021] Heat 18.9Kg of deionized water to 60°C, add 6.3Kg of polyethylene glycol with a molecular weight of 4000, heat up to 70°C while stirring, add 3.2Kg of polyethylene glycol with a molecular weight of 20,000, stop heating immediately after dissolving, and let it cool naturally spare.

[0022] In the reactor, 0.5Kg polyester and 10Kg dimethyl sulfoxide were formulated into a solution, and then 160.0g of phthalic anhydride and 0.32g of 98% concentrated sulfuric acid were added to the polyester solution, and heated to 40°C while stirring. React under reflux for 20 minutes, then add the above-mentioned 9.5Kg polyethylene glycol aqueous solution, mix evenly, raise the temperature to 100°C and keep it for 2.5 hours to allow it...

Embodiment 2

[0025] Firstly, the polyethylene glycol with a molecular weight of 2000, the polyethylene glycol with a molecular weight of 20000, the polyester yarn with a molecular weight of 15000, and the crosslinking agent phthalic anhydride are dried for later use.

[0026] Heat 18.9Kg of deionized water to 55°C, add 6.3Kg of polyethylene glycol with a molecular weight of 2000, heat up to 70°C while stirring, add 3.2Kg of polyethylene glycol with a molecular weight of 20,000, stop heating immediately after dissolving, and let it cool naturally spare

[0027] In the reactor, 0.5Kg polyester and 10Kg dimethyl sulfoxide were formulated into a solution, and 160.0 g of cross-linking agent phthalic anhydride and 0.32 g of catalyst 98% concentrated sulfuric acid were added to the polyester solution, heated to 40 ° C, React under stirring and reflux conditions for 10 minutes, then add the above-mentioned 9.5Kg polyethylene glycol solution, stir evenly, keep at 140°C for 1.5 hours, let it fully r...

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Abstract

The invention discloses a method for improving phase-change performance of polyethylene glycol / polyester solid-solid phase change material (PEG / PET PCM) through utilizing eutectic simultaneously used by polyethylene glycols with different molecular weights, which comprises the steps that the polyethylene glycols with different molecular weights are simultaneously used in a certain mass ratio to synthesize the PEG / PET PCM so as to improve phase transition enthalpy of the PEG / PET PCM with a controllable phase-change temperature and a narrowing phase-change peak width. The method has the advantages that the phase transition enthalpy of the PEG / PET PCM synthesized chemically by graft copolymerization through PEG eutectic is up to 157.17J / g, which is improved by 35 percent and is larger than the phase transition enthalpy of the PEG / PET PCM which is synthesized by PEGs with two kinds of different molecular weights singly and the PET, and the product has no toxicity and no harm, improved production yield, low cost, and good application prospect.

Description

technical field [0001] The invention relates to a method for producing solid-solid phase change materials by graft copolymerization of polyethylene glycol and polyester, in particular to a method for improving polyethylene glycol / polyester solid-solid phase transition materials by using polyethylene glycol cocrystals with different molecular weights ( PEG / PET PCM) phase change performance method. Background technique [0002] The main advantage of polymer solid-solid phase change materials is that there is no liquid state before and after the phase change. When the solid-solid phase change material phase changes, the heat capacity is tens of times higher than that of water; characteristics and can be used for temperature regulation. At present, similar solid-solid phase change materials polyethylene glycol / cellulose acetate and polyethylene glycol / chitosan have been synthesized, but polyethylene glycol and chitosan solid-solid phase change materials are not suitable for bat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G81/00C09K5/02C08G65/48C08G63/91
Inventor 王艳秋
Owner XUZHOU COLLEGE OF INDAL TECH
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