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Carbamate gelator composite shape stabilized phase change material and preparation method thereof

A urethane-based, shape-setting phase-change material technology, applied in heat exchange materials, chemical instruments and methods, etc., can solve the problem of increasing the interaction between the gel factor and the phase-change material without considering the compatibility of the phase-change material , the complex synthesis process of gel factor, etc., to achieve the effect of low preparation cost, sufficient raw material source, and easy control of preparation conditions

Inactive Publication Date: 2015-09-09
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the design of this series of gelling factors did not consider the compatibility with phase change materials such as paraffin wax. The interaction between the network structure formed by the gelling factors and the phase change materials is small, which may easily cause the phase change components to be separated at high temperature. Leakage and Phase Separation
Chinese patent (CN103773321A) provides an amide gel factor composite shape-setting phase change material. The selected gel factor structure has a long alkane chain structure compatible with phase change materials such as paraffin, and can be non-cohesive through hydrogen bonds. Valence bonds self-assemble to form a network structure to achieve shape-setting support; at the same time, the gel factor structure has a long alkane chain structure compatible with phase change materials such as paraffin, which can increase the interaction between the gel factor and phase change materials and reduce leakage rate, but the synthesis process of this series of gelling factors is still complicated

Method used

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  • Carbamate gelator composite shape stabilized phase change material and preparation method thereof
  • Carbamate gelator composite shape stabilized phase change material and preparation method thereof
  • Carbamate gelator composite shape stabilized phase change material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The carbamate gelling factor selected in this embodiment is diphenylmethane-4,4'-bis(octadecyl carbamate) (MDCM-18), and its structural formula is:

[0036]

[0037] Take 4.0 g of solid paraffin wax with a melting point of 56-58 ° C and a phase change enthalpy of 189.3 J / g, melt it in a 25 mm × 40 mm sample bottle, add gel factor MDCM-18 to make the mass percentage 3%, heat and stir until Dissolve completely, and after the mixture is clarified, cool naturally to prepare the gel factor composite shape-setting phase change material.

[0038] The phase-change enthalpy of the shape-fixed phase-change material obtained in this embodiment is 180.3 J / g and the phase-change temperature is 58.6° C. as tested by a differential scanning calorimeter (DSC). The gel disassociation temperature of the phase change gel measured by the test tube tilt method was 98°C, and the gel-sol temperature was 102°C.

Embodiment 2

[0040] The carbamate gel factor selected in this embodiment is the same as that in Example 1.

[0041] Take 4.0g of solid paraffin wax with a melting point of 56-58°C and a phase change enthalpy of 189.3J / g, melt it in a 25mm×40mm sample bottle, add gel factor MDCM-18 to make it 1% by mass, heat and stir until Dissolve completely, and after the mixture is clarified, cool naturally to prepare the gel factor composite shape-setting phase change material.

[0042] The phase-change enthalpy of the shape-fixed phase-change material obtained in this embodiment is 178.4 J / g and the phase-change temperature is 58.7° C. as tested by a differential scanning calorimeter (DSC). The gel disassociation temperature of the phase change gel measured by the test tube tilt method was 89°C, and the gel-sol temperature was 92°C.

Embodiment 3

[0044] The carbamate gel factor selected in this embodiment is the same as that in Example 1.

[0045] Take 4.0g of solid paraffin wax with a melting point of 56-58°C and a phase change enthalpy of 189.3J / g, melt it in a 25mm×40mm sample bottle, add gel factor MDCM-18 to make it 6% by mass, heat and stir until Dissolve completely, and after the mixture is clarified, cool naturally to prepare the gel factor composite shape-setting phase change material.

[0046] The phase change enthalpy of the shape-fixed phase change material obtained in this example is 181.1 J / g, and the phase change temperature is 58.7°C, as tested by a differential scanning calorimeter (DSC). The gel disassociation temperature of the phase change gel measured by the test tube tilt method was 103°C, and the gel-sol temperature was 106°C.

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Abstract

The invention discloses a carbamate gelator composite shape stabilized phase change material and a preparation method thereof. The shape stabilized phase change material is prepared by the method of: (1) according to mass percent, weighing 85-99.5% of a phase change material, and 0.5-15% of a carbamate gelator; (2) adding the carbamate gelator into the phase change material, and conducting heating stirring till complete dissolution, thus obtaining a transparent mixture; and (3) placing the transparent mixture in a die and conducting natural cooling so as to obtain the composite shape stabilized phase change material. According to the invention, a solid-liquid phase change material is adopted as the thermal storage material, the space network structure formed by self-assembling of organic small molecule gelators is used as the supporting material of the phase change material, so that the shape stabilized phase change material with the characteristics of high phase change enthalpy, low preparation cost, simple preparation process and good application performance can be obtained.

Description

technical field [0001] The invention relates to a shape-setting phase-change material and a preparation method thereof, in particular to a urethane gel factor composite shape-setting phase-change material and a preparation method thereof. Background technique [0002] Phase change materials (PCMs) are a general term for substances that use materials for energy storage and temperature regulation accompanied by a large number of endothermic and exothermic effects during the phase transition process. Phase change materials are widely used in building energy saving, road traffic, modern agricultural greenhouses, solar energy utilization, food refrigeration and transportation, medical care, electronic equipment heat dissipation, athletes cooling and warm clothing, special temperature control clothing, aerospace technology, military infrared camouflage, power transfer There are broad application prospects in many fields such as peak filling and valley filling, industrial waste hea...

Claims

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Application Information

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IPC IPC(8): C09K5/06
Inventor 张海良赵建航梁杰兴陈煜卓
Owner XIANGTAN UNIV