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Nanometer SiO2-GO synergistically modified microcapsule phase change energy storage material

A phase change energy storage material, a technology of synergistic modification, applied in heat exchange materials, chemical instruments and methods, etc., can solve the problems of emulsifier toxicity, difficult to degrade, large amount of emulsifier incorporated, etc., and achieve excellent thermal performance. , high specific surface area, good surface reactivity

Inactive Publication Date: 2018-10-02
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the disadvantage of using emulsifiers to prepare phase change core material emulsions is that the emulsifiers are incorporated in a large amount. Usually, emulsifiers are toxic and difficult to degrade, causing serious environmental problems. Therefore, how to prepare microcapsule phase change materials Reducing the amount of emulsifier in the process and maintaining good stability and dispersibility of the emulsion is one of the problems faced in the preparation of microcapsule phase change materials.

Method used

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  • Nanometer SiO2-GO synergistically modified microcapsule phase change energy storage material
  • Nanometer SiO2-GO synergistically modified microcapsule phase change energy storage material
  • Nanometer SiO2-GO synergistically modified microcapsule phase change energy storage material

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Weigh 0.4g Span80, 0.2g Tween80 and 1.4g PVA aqueous solution, mix them with 20g solid-liquid mixed paraffin, emulsify and disperse at 70°C water bath temperature for 1h, add about 30ml deionized water dropwise during stirring, and emulsify into The number is 2000r / min, obtains the phase change core material emulsion, utilizes the acetic acid solution to adjust the pH value of the emulsion to be 4.5;

[0032] Weigh 2g of melamine, 16g of urea and 50g of formaldehyde solution, mix the two, add triethanolamine solution to adjust the pH of the mixed system to 8.5, stir at a reaction temperature of 70°C at a stirring rate of 500r / min for 1h, and obtain a viscous transparent wall Material prepolymer solution;

[0033] At a reaction temperature of 65°C, drop the prepared wall material prepolymer solution into the core material emulsion drop by drop, stir well for 2 hours after the dropping, adjust the pH value of the system to 3 with ammonium chloride solution, and continue s...

Embodiment 2

[0035] Weigh 0.2g Span80, 0.1g Tween80 and 0.3g PVA aqueous solution, mix it with 20g solid-liquid mixed paraffin, add 2g modified nano-SiO 2 and 0.18g GO (25ml graphene oxide aqueous solution), emulsified and dispersed at 70°C water bath temperature for 1h, added about 30ml deionized water dropwise during the stirring process, and the emulsification rotation speed was 2000r / min to obtain a phase change core material emulsion, Utilize acetic acid solution to adjust the pH value of the emulsion to 4.5;

[0036] Weigh 2 g of melamine, 16 g of urea and 50 g of formaldehyde solution, mix the two, add triethanolamine solution to adjust the pH value of the mixed system to 8.5, and stir at a reaction temperature of 70 °C at a stirring rate of 500 r / min for 1 h to obtain a viscous and transparent Wall material prepolymer solution;

[0037] At a reaction temperature of 65°C, drop the prepared wall material prepolymer solution into the core material emulsion drop by drop, stir well for...

Embodiment 3

[0039] Weigh 3g modified nano-SiO 2 Mix it with 0.25g graphene oxide (34ml graphene oxide aqueous solution) and 20g solid liquid paraffin, emulsify and stir for 1h at a water bath temperature of 70°C, add about 30ml deionized water dropwise during stirring, and the emulsification rotation speed is 2000r / min, obtain the phase-change core material emulsion, utilize the acetic acid solution to adjust the pH value of the emulsion to be 4.5;

[0040] Weigh 2 g of melamine, 16 g of urea and 50 g of formaldehyde solution, mix the two, add triethanolamine solution to adjust the pH value of the mixed system to 8.5, and stir at a reaction temperature of 70 °C at a stirring rate of 500 r / min for 1 h to obtain a viscous and transparent Wall material prepolymer solution;

[0041] At a reaction temperature of 65°C, drop the prepared wall material prepolymer solution into the core material emulsion drop by drop, stir well for 2 hours after the dropping, adjust the pH value of the system to...

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Abstract

The invention provides a nanometer SiO2-GO synergistically modified microcapsule phase change energy storage material, and relates to the technical field of phase change energy storage materials. Thematerial comprises the following raw materials in parts by weight: 100 parts of a phase change core material, 0.5 to 2.5 parts of GO, 0 to 10 parts of an emulgator, 10 to 20 parts of modified nanometer SiO2, 60 to 180 parts of urea, 0 to 20 parts of melamine, 135 to 450 parts of a formaldehyde solution, and an appropriate amount of an acidic regulator and an alkaline regulator. The material take modified nanometer SiO2 and GO as emulsion stabilizers of a phase change core material emulsion, improves the stability of the emulsion, and further improves the thermal property of microcapsule phasechange material particles.

Description

technical field [0001] The invention relates to the technical field of phase change energy storage materials, in particular to a nano-SiO 2 -GO synergistically modified microcapsule phase change energy storage materials. Background technique [0002] Phase change energy storage technology is a technology that uses substances to absorb and release a large amount of heat during the phase change process, and then store heat. Phase change materials have high heat storage capacity, obvious energy-saving effect, and approximately constant temperature during the phase change process. It has important application value and broad application prospects in many fields such as energy-saving buildings, heating, air conditioning, military engineering, engineering thermophysics, aerospace technology, and solar energy utilization. [0003] Microcapsule technology is a technology that coats phase change core materials with wall materials to form tiny particles. Compared with ordinary phase ...

Claims

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Application Information

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IPC IPC(8): C09K5/06
CPCC09K5/063
Inventor 张毅柳东明王可汗宋佳欣陶善仁任柯柯
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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