High-phase-change thermoset phase change material and preparation method thereof

A phase-change material and phase-change heat technology, which can be applied in heat exchange materials, chemical instruments and methods, etc., can solve the problems of easy leakage, high cost, and difficult to industrialize production, and achieve high phase change latent heat value and low cost. Effect

Inactive Publication Date: 2012-12-19
HENAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is a common problem at present. The solid-liquid phase change material is easy to leak after producing liquid during the phase change process. At present, microencapsulation of the phase change material is generally used to solve this problem. For example, Chinese patent CN102492397 discloses a sugar The latent heat value of alcohol-based phase change material microcapsules is about 230J / g, but due to the limitation of microencapsulation rate, the high latent heat density of sugar alcohol cannot be fully utilized, and the cost of microencapsulation is very high, making it difficult to realize industrialization Production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0017] A high-phase-change heat-setting phase-change material, the preparation method of which comprises the following steps:

[0018] Step 1. Selection of raw materials

[0019] Weigh erythritol and expandable graphite with an expansion rate of 100-500 mL / g respectively, and the weight of erythritol accounts for 80-90% of the total weight of erythritol and expandable graphite particles;

[0020] Step 2, put the erythritol weighed in step 1 in a beaker, and heat it in an oil bath at 125-135°C to form a melt for later use;

[0021] Step 3. Put the expandable graphite with an expansion rate of 100-500 mL / g weighed in step 1 into a vacuum drying oven, and dry it at a temperature of 65-75°C and a vacuum of -0.09MPa for 8-12 hours, then take it out and place it in a muffle furnace with a temperature of 700-800°C for 30-90s to form expanded graphite with a microporous structure, and set aside;

[0022] Step 4, put the swollen graphite prepared in step 2 into the erythritol melt pr...

Embodiment l

[0024] First, weigh 45g of erythritol and place it in a beaker, and heat it to a completely molten state in an oil bath at 130°C to form a melt;

[0025] Next, weigh 5 g of expandable graphite particles with an expansion rate of 200 mL / g, put them in a vacuum drying oven, and dry them for 10 hours at a temperature of 70 °C and a vacuum of -0.09 MPa, then take them out and place them at a temperature of Heat treatment in a muffle furnace at 750°C for 60s to expand the expandable graphite particles and prepare expanded graphite with a microporous structure;

[0026] Finally, put the above-mentioned expanded pus graphite into the erythritol melt, stir and absorb in an oil bath at 130° C. for 1 hour, and cool naturally to obtain the product.

[0027] Experiments show that the latent heat of phase change of heat-setting phase change materials prepared with such a ratio can reach 308.2 J / g, which is about 29.5% higher than the maximum value of 238.0 J / g in Chinese patent CN102492397...

Embodiment 2

[0029] First, weigh 28g of erythritol and place it in a beaker, and heat it to a completely molten state in an oil bath at 135°C to form a melt;

[0030] Next, weigh 5 g of expandable graphite particles with an expansion ratio of 500 mL / g, put them in a vacuum drying oven, and dry them for 12 hours at a temperature of 70 °C and a vacuum of -0.09 MPa, then take them out and place them at a temperature of Heat treatment in a muffle furnace at 800°C for 80s to expand the expandable graphite particles and prepare expanded graphite with a microporous structure;

[0031] Finally, put the above-mentioned expanded pus graphite into the erythritol melt, stir and absorb in an oil bath at 135° C. for 1.5 hours, and cool naturally to obtain the product.

[0032] Experiments show that the phase change latent heat value of heat-setting phase change materials prepared with such a ratio can reach 289.0 J / g, which is about 21.4% higher than the maximum value of 238.0 J / g in Chinese patent CN10...

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Abstract

The invention discloses a high-phase-change thermoset phase change material. The high-phase-change thermoset phase change material is prepared form expandable graphite of which the expansion multiplying power is 100-500mL / g and erythritol which is adsorbed into gaps of the expandable graphite, wherein the weight of the expandable graphite accounts for 10-20 percent of the total weight, and the balance is erythritol. The method comprises the following steps of: heating erythritol in an oil bath of 125-135 DEG C according to a certain proportion till the erythritol is fully molten for later use; putting expandable graphite into a vacuum drying oven; drying at the temperature of 65-75 DEG C under the vacuum degree of -0.09MPa for 8-12 hours; taking out, and putting into a muffle furnace of which the temperature is 700-800 DEG C for calcining for 30-90 seconds to form expansion graphite with a microcellular structure for later use; stirring the two kinds of materials in the oil bath for 1-1.5 hours; and naturally cooling to obtain a product. The high-phase-change thermoset phase change material is simple in structure; and according to the porous adsorption characteristic of the expansion graphite and the high-phase-change potential heat value of the erythritol, the product has higher phase change potential heat value than a phase change material prepared in the prior art.

Description

technical field [0001] The invention relates to the technical field of functional composite materials, in particular to a high-phase-change heat-setting phase-change material and a preparation method thereof. Background technique [0002] Phase change materials refer to substances that change shape with temperature and can provide latent heat. The latent heat of phase change materials can be used to store or release energy to produce various facilities that improve energy utilization. The commonly used phase change materials are solid-liquid phase change materials, that is, the phase change process is from solid to liquid. Or change from liquid to solid state, at this time the phase change material will absorb or release a large amount of latent heat. Phase change materials are more and more widely used in solar energy utilization, aerospace, peak shifting of heat load, new energy-saving building materials, waste heat recovery and air conditioning technology. It is popular...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06
Inventor 潘炳力成玉梅杜锦屏杜三明刘继纯张永振
Owner HENAN UNIV OF SCI & TECH
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