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Olefin composite shaping phase-change material and preparation thereof

A technology of shape-setting phase change materials and paraffins, which is applied in heat exchange materials, chemical instruments and methods, etc., can solve the problem of high proportion of support materials and additives, low percentage of main heat storage materials, and reduced phase change enthalpy, etc. problem, to achieve the effect of good application performance, low preparation cost, and high phase change enthalpy

Inactive Publication Date: 2009-05-20
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The reported mass percentage of additives in the preparation of fixed-shape phase change materials is high, and the percentage content of paraffin-based main heat storage materials is low, which will inevitably lead to a decrease in phase change enthalpy, and the proportion of supporting materials and additives is high; Or complex preparation processes such as microencapsulation will increase the cost

Method used

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  • Olefin composite shaping phase-change material and preparation thereof
  • Olefin composite shaping phase-change material and preparation thereof
  • Olefin composite shaping phase-change material and preparation thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Take 54 with a melting point of 54-56°C and a phase change enthalpy of 187.29J / g # 90.00 g of solid paraffin was melted in a beaker, and (1,3; 2,4)-di(4-methylbenzylidene) sorbitol (MDBS) was added to make the mass percentage 0.5%, heated and stirred until completely dissolved, After the mixture is clear and transparent, pour it into an iron mold with a width of 3 cm, a thickness of 1 cm, and a height of 15 cm, let it cool and take it out to obtain a paraffin composite shape-setting phase change material. ((1,3;2,4)-bis(4-methylbenzylidene)sorbitol is a dicondensate of sorbitol and 4-methylbenzaldehyde)

[0039] The leakage rate of the paraffin-based composite shape-setting phase-change material prepared in this example is 4.23%. Its phase change enthalpy is 192.17J / g.

Embodiment 2

[0041] Take 54 with a melting point of 54-56°C and a phase change enthalpy of 187.29J / g #Melt 90.00g of solid paraffin in a beaker, add MDBS to make it 1% by mass, heat and stir until completely dissolved, pour the mixture into an iron mold with a width of 3cm, a thickness of 1cm, and a height of 15cm after the mixture is clear and transparent, let it cool and take it out , to prepare paraffin-based composite shape-setting phase-change materials.

[0042] The leakage rate of the paraffin-based composite shape-setting phase-change material prepared in this example is 2.56%. Its phase change enthalpy is 190.25J / g.

Embodiment 3

[0044] Take 54 with a melting point of 54-56°C and a phase change enthalpy of 187.29J / g # Melt 90.00g of solid paraffin in a beaker, add MDBS to make it 3% by mass, heat and stir until it is completely dissolved, pour the mixture into an iron mold with a width of 3cm, a thickness of 1cm, and a height of 15cm, let it cool and take it out , to prepare paraffin-based composite shape-setting phase-change materials.

[0045] The leakage rate of the paraffin-based composite shape-setting phase-change material prepared in this example is 1.75%. Its phase change enthalpy is 192.74J / g.

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Abstract

The invention discloses an olefin-typed compound shape-stabilized phase change material and a preparation method thereof; the olefin-typed compound shape-stabilized phase change material is prepared by the following methods: (1) according to the mass percentage, 81-99.5 percent of olefin, 0.5-10 percent of polyol acetal compound and 0-9 percent of high density polyethylene are weighed and taken; (2) the polyol acetal compound and the high density polyethylene are added to the olefin, heated and mixed till being completely dissolved to prepare the mixture; and (3) the mixture is poured in a die, naturally cooled and taken out of the die. The olefin-typed compound shape-stabilized phase change material uses the olefin as the heat-storage material, and takes the spatial network structure formed by small molecule gelator as the supporting material of the olefin; furthermore, the high density polyethylene is added or not added as the supporting material, thus obtaining the shape-stabilized phase change material which has low leakage, high transformation enthalpy, low preparation cost and excellent application performance.

Description

technical field [0001] The invention relates to a paraffin composite shape-setting phase-change material and a method thereof. Background technique [0002] Phase change heat storage materials (PCM) have broad application prospects in many fields such as building heating, air conditioning energy saving, solar energy utilization, etc. Solid-liquid phase change materials are the most researched and applied. In practical applications, traditional solid-liquid phase change energy storage materials need to be packaged in containers, which increases the thermal resistance between the phase change material and the external heat transfer medium during heat transfer, reduces the heat transfer efficiency, and increases the cost. In recent years, some studies have used some methods to modify solid-liquid phase change materials, which can make them have the properties of solid-solid phase change materials. Inaba (Heat and Transfer, 1997, (32): P307) mixed high-density polyethylene and ...

Claims

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Application Information

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IPC IPC(8): C09K5/06
Inventor 张晓行宋健冯荣秀
Owner TIANJIN UNIV
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