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Preparation method of high-thermal-conductivity low-leakage phase-change composite

A phase change composite material and phase change material technology, applied in the field of preparation of phase change composite materials with high thermal conductivity and low leakage, can solve the problems of large differences between phase change materials and thermal conductive fillers, poor compatibility between support materials and phase change materials, etc. , to achieve good thermal conductivity, low cost and good environmental stability

Inactive Publication Date: 2015-02-25
SOUTHWEAT UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

(2) Phase change materials, support materials, and thermally conductive fillers do not belong to the same kind of substances, especially phase change materials and thermally conductive fillers are quite different. Poor compatibility with phase change materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Put the flaky expandable graphite in a beaker and dry it in an oven at 50°C for 10h. Take 3.0-4.0g of dry expandable graphite each time and place it in a high-temperature furnace at 900°C, expand at high temperature for 60s, and obtain expanded graphite EG;

[0026] Melt and blend 5g of EG and 0.1g of paraffin wax with a melting point of 50°C at 70°C for 10 minutes, take it out and cool it, put it in a crusher and crush it into pellets to obtain paraffin-modified EG;

[0027] Melt and blend 10g of HDPE and 0.2g of paraffin wax with a melting point of 50°C at 180°C for 20 minutes, take it out for cooling, put it in a crusher and crush it into pellets to obtain paraffin-modified HDPE;

[0028] Melt 25g of paraffin wax with a melting point of 54°C at 80°C, raise the temperature to 160°C, add 10g of paraffin-modified EG and 15g of paraffin-modified HDPE into the molten paraffin, melt and blend for 30min; The material was poured into a mold preheated at 160°C, a certain pre...

Embodiment 2

[0031] Melt and blend 10g of carbon fiber and 0.4g of paraffin wax with a melting point of 28°C at 70°C for 10 minutes, take it out for cooling, and crush it into pellets to obtain paraffin-modified carbon fiber;

[0032] Melt and blend 10g of SBS and 0.2g of paraffin wax with a melting point of 28°C at 190°C for 20 minutes, take it out and cool it, put it in a crusher and crush it into pellets to obtain paraffin-modified SBS;

[0033] Melt 30g of paraffin wax with a melting point of 28°C at 80°C, raise the temperature to 190°C, add 10g of paraffin-modified carbon fiber and 10g of paraffin-modified SBS into the molten paraffin, melt and blend for 30min; The material was poured into a mold preheated at 160°C, a certain pressure was applied, the pressure was maintained for 20 minutes, the temperature was lowered, and the mold was demoulded to obtain a paraffin / SBS / carbon fiber phase change composite material. After testing, the latent heat of phase change of the paraffin / SBS / car...

Embodiment 3

[0036] Melt and blend 10 g of flake graphite and 0.5 g of stearic acid at 80° C. for 10 minutes, take it out for cooling, and crush it into pellets to obtain stearic acid modified flake graphite;

[0037] Melt blend 5g LDPE and 0.1g stearic acid at 140°C for 20min, take it out for cooling, place it in a crusher and crush it into pellets to obtain stearic acid modified LDPE;

[0038] Melt 35g of stearic acid at 80°C, raise the temperature to 140°C, add 10g of stearic acid modified flake graphite and 5g of stearic acid modified LDPE into the molten stearic acid, and melt blend for 30min; The mixed composite material was poured into a mold preheated at 140°C, a certain pressure was applied, the pressure was maintained for 20 minutes, the temperature was lowered, and the mold was demolded to obtain a stearic acid / flaky graphite / LDPE phase change composite material. After testing, the stearic acid / flake graphite / LDPE phase change composite material prepared by this method has a lat...

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Abstract

The invention discloses a preparation method of a high-thermal-conductivity low-leakage phase-change composite. The method includes: taking a phase-change material and thermal-conductive filler in the mass ratio of 0.1%-1% for melt mixing at the temperature above the melt temperature of the phase-change material for 10min, and taking out the mixture for cooling prior to breaking into granules to obtain modified filler; taking the phase-change material and a support material in the mass ratio of 0.1%-10% for melting at the temperature above the melting temperature of the support material and the phase-change material for 20min, and taking out the molten materials for cooling prior to breaking the materials into granules to obtain a modified support material; adding the modified thermal-conductive filler and the modified support material in the proportion of 1:9-9:1 into the phase-change material counting for 40-50% of total mass for melting the the temperature above the melting temperature of the support material and the phase-change material for 30min prior to obtaining a mixed composite; pouring the mixed composite into a preheated mould, applying certain pressure to the mould, maintaining the pressure for 20min, and performing cooling and demoulding to obtain the high-thermal-conductivity low-leakage phase-change composite. Compared with the prior art, the preparation method has the advantages of simplicity, low cost and chip and available raw materials.

Description

technical field [0001] The invention relates to the preparation of a phase-change composite material, in particular to a preparation method of a phase-change composite material with high thermal conductivity and low leakage. Background technique [0002] Among the phase change materials, the most researched, the most widely sourced, the cheapest, and the most practical application prospects are solid-liquid phase change materials, which store and release heat energy through the transformation of materials between solid and liquid phases. Organic phase change materials as solid-liquid phase transition materials are one of the most potential heat storage materials. Due to the advantages of good chemical stability, large latent heat of phase change, no supercooling and phase separation, wide range of sources, and low price, organic phase change materials have been widely used in phase change materials. However, organic phase change materials have the disadvantages of low therm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06
CPCC09K5/063
Inventor 杨文彬张凯刘菁伟田本强罗李娟范敬辉邢涛
Owner SOUTHWEAT UNIV OF SCI & TECH
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