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Preparation method of graphite modified phase change microcapsule

A technology of phase change microcapsules and graphite modification, applied in chemical instruments and methods, heat exchange materials, etc., can solve the problems of poor heat storage performance, low encapsulation rate, low latent heat of phase change, etc., and achieve improved heat storage performance , the effect of good heat storage capacity

Inactive Publication Date: 2020-08-11
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Technical problem: The purpose of the present invention is to provide a graphite-modified phase-change microcapsule for the technical problems of poor heat storage performance, low latent heat of phase change and low encapsulation rate in the existing phase-change microcapsule and its preparation process. The preparation method, the graphite-modified phase-change microcapsules of the present invention not only enhance the heat storage performance, but also improve the phase-change latent heat and encapsulation rate of the phase-change microcapsules

Method used

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  • Preparation method of graphite modified phase change microcapsule
  • Preparation method of graphite modified phase change microcapsule

Examples

Experimental program
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Embodiment 1

[0030] 1. Weigh 3.0g of melamine and 8mL of formaldehyde solution with a mass fraction of 37%, add 20mL of deionized water, adjust the pH of the mixture to 8-9 with triethanolamine, and then stir the reaction in a constant temperature water bath at 70°C, stirring The speed is 600r / min, and after the mixed solution is clarified, continue to stir and react for 30min to obtain a melamine resin prepolymer solution;

[0031] 2. Dissolve 1.15g of styrene-maleic anhydride copolymer and 0.9g of sodium hydroxide in 175mL of deionized water, adjust the pH of the mixture to 4-5 with citric acid; add 17.5g of For paraffin, fully melt the paraffin in a 70°C water bath, add 0.0875g of graphite, then stir at a speed of 3000r / min for 60min, and then disperse with ultrasonic waves for 10min after stirring to obtain a graphite-modified paraffin emulsion.

[0032] 3. Put the paraffin wax emulsion in a water bath at 70°C, keep a stirring rate of 600rpm / min, and drop in the melamine resin prepolym...

Embodiment 2

[0036] 1. Weigh 3.0g of melamine and 8mL of formaldehyde solution with a mass fraction of 37%, add 20mL of deionized water, adjust the pH of the mixture to 8-9 with triethanolamine, and then stir the reaction in a constant temperature water bath at 70°C, stirring The speed is 600r / min, and after the mixed solution is clarified, continue to stir and react for 30min to obtain a melamine resin prepolymer solution;

[0037] 2. Dissolve 1.15g of styrene-maleic anhydride copolymer and 0.9g of sodium hydroxide in 175mL of deionized water, adjust the pH of the mixture to 4-5 with citric acid; add 17.5g of For paraffin wax, fully melt the paraffin wax in a 70°C water bath, add 0.0175g of graphite, then stir at a speed of 3000r / min for 60min, and then disperse with ultrasonic waves for 10min after stirring to obtain a graphite-modified paraffin wax emulsion.

[0038] 3. Put the paraffin wax emulsion in a water bath at 70°C, keep a stirring rate of 600rpm / min, and drop in the melamine re...

Embodiment 3

[0042] 1. Weigh 3.0g of melamine and 8mL of formaldehyde solution with a mass fraction of 37%, add 20mL of deionized water, adjust the pH of the mixture to 8-9 with triethanolamine, and then stir the reaction in a constant temperature water bath at 70°C, stirring The speed is 600r / min, and after the mixed solution is clarified, continue to stir and react for 30min to obtain a melamine resin prepolymer solution;

[0043] 2. Dissolve 1.15g of styrene-maleic anhydride copolymer and 0.9g of sodium hydroxide in 175mL of deionized water, adjust the pH of the mixture to 4-5 with citric acid; add 17.5g of For paraffin wax, fully melt the paraffin wax in a 70°C water bath, then stir at a speed of 3000r / min for 60 minutes, and then disperse with ultrasonic waves for 10 minutes after stirring to obtain a paraffin wax emulsion.

[0044] 3. Put the paraffin wax emulsion in a water bath at 70°C, keep a stirring rate of 600rpm / min, and drop in the melamine resin prepolymer solution at a rate...

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Abstract

The invention discloses a preparation method of a graphite modified phase change microcapsule, belonging to the field of energy storage of phase change materials. The preparation method comprises thefollowing steps: firstly, stirring and mixing a formaldehyde solution, melamine, triethanolamine and the like under a certain condition to prepare a melamine resin prepolymer solution; stirring and mixing a phase change material, an emulsifier and graphite under a certain condition to prepare a graphite modified emulsion; and finally, carrying out an in-situ polymerization reaction on the preparedprepolymer solution and the emulsion, and successively carrying out filtering, washing and drying to obtain the graphite modified phase change microcapsule. Compared with the prior art, the preparation method of the invention has the advantages that the method is friendly to environment, simple in process and low in cost; and the obtained phase change microcapsule is spherical in shape, good in heat storage performance, high in phase change latent heat, high in capsule wrapping rate and excellent in overall structure and thermal stability, and can be widely applied to the fields of solar energy utilization, building energy conservation, functional thermal fluids, military affairs and the like.

Description

technical field [0001] The invention relates to a preparation method and application of graphite-modified phase-change microcapsules, belonging to the technical field of phase-change energy storage materials. [0002] technical background [0003] Phase change material refers to a substance whose state (solid, liquid, gas) can change with the change of temperature, and at the same time can provide latent heat of phase change. Phase change material can absorb and release during the phase change process. A large amount of heat can play the role of temperature control and energy storage. [0004] Microcapsule technology began in the 1930s and is a new material preparation technology developed in recent years. Phase-change microcapsules refer to capsules that use inorganic materials, organic materials or organic-inorganic hybrid materials as wall materials to wrap phase-change materials (core materials) to form core-shell structures, most of which are spherical; phase-change mat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06C08G12/32
CPCC08G12/32C09K5/063
Inventor 张云峰兰志兴张璐刘鹏
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY