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Starch and expanded graphite phase-change composite material and method for preparing same

A phase change composite material and expanded graphite technology are applied in the field of starch expanded graphite phase change composite materials and their preparation, and can solve the problems of thin microcapsule shells, poor stability of microcapsule phase change composites, and microcapsule phase change. The composite material shell is broken and other problems, to achieve the effect of good encapsulation, excellent structural stability, and excellent thermal conductivity.

Inactive Publication Date: 2019-02-22
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The stability of the microcapsule phase change composite materials obtained by many studies is not very good. The reason may be that the shell of the microcapsules is relatively thin, and the volume change caused by the solid-liquid transition during the phase change process of the phase change material , leading to the cracking of the shell of the microcapsule phase change composite

Method used

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  • Starch and expanded graphite phase-change composite material and method for preparing same
  • Starch and expanded graphite phase-change composite material and method for preparing same
  • Starch and expanded graphite phase-change composite material and method for preparing same

Examples

Experimental program
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Effect test

Embodiment 1

[0031] (1) Weigh 1 g of starch and disperse it in 100 ml of deionized water, and set the temperature of the constant temperature magnetic stirrer at 90°C. The starch suspension was heated under a magnetic stirrer, and after it boiled, continue to boil for 15 minutes.

[0032] (2) Transfer the boiling starch suspension to a high-speed shearing machine. Immediately add 0.5-1 g of expanded graphite to the boiling starch suspension, vigorously stir the starch-expanded graphite mixed suspension at 10,000 rpm under a high-speed shear, and form a fully dispersed suspension after stirring for 15 minutes.

[0033] (3) Heat 9 g of paraffin in a vacuum oven at 70° C. until it melts.

[0034] (4) Add molten paraffin to the suspension in (2), and vigorously stir at a speed of 10,000 rpm for 15 minutes under a high-speed shear.

[0035] (5) Filter the sample to remove its deionized water. Place in an oven at 35°C to dry, solidify the paraffin droplets and solidify the starch. After test...

Embodiment 2

[0037] (1) Weigh 1 g of starch and disperse it in 100 ml of deionized water, and set the temperature of the constant temperature magnetic stirrer at 90°C. The starch suspension was heated under a magnetic stirrer, and after it boiled, continue to boil for 15 minutes.

[0038] (2) Transfer the boiling starch suspension to a high-speed shearing machine. Then, 0.5 g of expanded graphite was immediately added to the boiling starch suspension, and the starch-expanded graphite mixed suspension was vigorously stirred at a speed of 10,000 rpm under a high-speed shear, and a fully dispersed suspension was formed after stirring for 15 minutes.

[0039] (3) Heat 4.45g of paraffin in a vacuum oven at 70°C until it melts.

[0040] (4) Add molten paraffin to the suspension in (2), and vigorously stir at a speed of 10,000 rpm for 15 minutes under a high-speed shear.

[0041](5) Filter the sample to remove its deionized water. Place in an oven at 35°C to dry, solidify the paraffin droplets...

Embodiment 3

[0044] (1) Weigh 1 g of starch and disperse it in 100 ml of deionized water, and set the temperature of the constant temperature magnetic stirrer at 90°C. The starch suspension was heated under a magnetic stirrer, and after it boiled, continue to boil for 15 minutes.

[0045] (2) Transfer the boiling starch suspension to a high-speed shearing machine. Then, 0.5 g of expanded graphite was immediately added to the boiling starch suspension, and the starch-expanded graphite mixed suspension was vigorously stirred at a speed of 10,000 rpm under a high-speed shear, and a fully dispersed suspension was formed after stirring for 15 minutes.

[0046] (3) 2.97g of paraffin was heated in a vacuum oven at 70°C until it melted. SEM images of starch, expanded graphite, paraffin, and phase change composites are shown in figure 2 middle. Figure A is the dispersed starch-expanded graphite phase-change composite material. It can be seen that the particles are spherical and the size is abou...

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Abstract

The invention relates to a starch and expanded graphite phase-change composite material and a method for preparing the same. The starch and expanded graphite phase-change composite material comprisesa middle phase-change material, micro-capsules and granules. The micro-capsules wrap the phase-change material, the granules are connected onto the outer walls of the micro-capsules, the phase-changematerial is paraffin, the micro-capsules are mixtures of modified starch and expanded graphite, the granules include starch granules and expanded graphite granules, and the micro-capsules comprise, byweight, 5%-12% of expanded graphite. Compared with the prior art, the starch and expanded graphite phase-change composite material and the method have the advantages that the starch and expanded graphite phase-change composite material is excellent in heat conductivity and structural stability, and the heat conductivity coefficient of the starch and expanded graphite phase-change composite material can be gradually increased along with increase of the expanded graphite.

Description

technical field [0001] The invention relates to the technical field of energy storage and energy conversion, in particular to a starch-expanded graphite phase-change composite material and a preparation method thereof. Background technique [0002] The energy issue is a major issue facing mankind in the 21st century, and every aspect of human production and life is inseparable from energy. At the same time, with the rapid development of the world economy, human demand for energy is getting higher and higher. However, the energy on the earth is limited, so the rational utilization and conservation of energy by heat storage and energy-saving materials is becoming more and more practical. The emergence of thermal energy storage systems is not only conducive to reducing dependence on fossil fuels, but also to the efficient and benign use of energy. In this system, thermal energy can be stored as sensible heat and latent heat. Compared with sensible heat storage, latent heat s...

Claims

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Application Information

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IPC IPC(8): C09K5/06
CPCC09K5/063
Inventor 张东任婉婉
Owner TONGJI UNIV
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