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A phase-change microcapsule with both magnetic and light-to-heat conversion properties and its preparation method

A technology of phase-change microcapsules and light-to-heat conversion, which is applied in the direction of heat exchange materials, chemical instruments and methods, etc., can solve problems such as the inability to achieve light-to-heat conversion energy storage and magnetic regulation, and the single function of phase-change microcapsules , to achieve the effect of improving supercooling phenomenon, good product uniformity and reducing pollution

Active Publication Date: 2020-05-12
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] One of the purposes of the present invention is to provide a phase-change microcapsule with both magnetic properties and light-to-heat conversion properties, which solves the problem that the existing phase-change microcapsules have single functions and cannot perform light-to-heat conversion energy storage and magnetic regulation in the same system uniform defect

Method used

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  • A phase-change microcapsule with both magnetic and light-to-heat conversion properties and its preparation method
  • A phase-change microcapsule with both magnetic and light-to-heat conversion properties and its preparation method
  • A phase-change microcapsule with both magnetic and light-to-heat conversion properties and its preparation method

Examples

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Effect test

Embodiment 1

[0033] A phase-change microcapsule with both magnetic and photothermal conversion properties, comprising a wall material and a core material wrapped in the wall material, the core material comprising n-octadecane and oleic acid-coated ferric oxide nanoparticles , the wall material includes melamine formaldehyde resin and graphene oxide, and the mass ratio of the core material to the wall material is about 1:1.05. The preparation process is as follows:

[0034] (1) Pretreatment of phase change microcapsule core material:

[0035] Weigh 2.322g FeCl respectively 3 ·6H 2 O, 0.8557g FeCl 2 ·4H 2 O and 150ml of deionized water were added to the three-necked flask, protected by nitrogen, and dissolved in a 60°C water bath with mechanical stirring at a speed of 600rpm, then 6.19ml of ammonia water was added to 80ml of deionized water to dissolve, and then quickly poured into the three-necked flask, Continue stirring for 30 minutes, then add 6.4 ml of oleic acid, mechanically stir...

Embodiment 2

[0048] A phase-change microcapsule with both magnetic and photothermal conversion properties, comprising a wall material and a core material wrapped in the wall material, the core material comprising n-octadecane and oleic acid-coated ferric oxide nanoparticles , the wall material includes melamine formaldehyde resin and graphene oxide, and the mass ratio of the core material to the wall material is 1:1.05.

[0049] The preparation method is the same as that of Example 1, except that the addition amount of ferric oxide coated with oleic acid is 0.3 g.

Embodiment 3

[0051] A phase-change microcapsule with both magnetic and photothermal conversion properties, comprising a wall material and a core material wrapped in the wall material, the core material comprising n-octadecane and oleic acid-coated ferric oxide nanoparticles , the wall material includes melamine formaldehyde resin and graphene oxide, and the mass ratio of the core material to the wall material is 1:1.05.

[0052] The preparation method is the same as that in Example 1, except that the addition amount of ferric oxide coated with oleic acid is 0.6 g.

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Abstract

The invention discloses a phase change microcapsule simultaneously having magnetism and photo-thermal conversion feature and a preparation method thereof. The phase change microcapsule is composed ofa core material and a wall material coating the core material; wherein the core material includes a normal alkane phase-change material and a surface-modified magnetic iron oxide, and the wall material includes a high-molecular resin material and a carbon material; mass ratio of the core material to the wall material is 1:1.05. The preparation method includes: firstly respectively pretreating thecore material and wall material: (1) stirring and mixing magnetic particles and the liquid phase-change material and performing ultrasonic treatment; (2) after a wall material prepolymer is prepared,adding the material with the photo-thermal conversion feature to the wall material prepolymer, and performing ultrasonic dispersion; then synthesizing the phase change microcapsule composite materialthrough in-situ polymerization. The phase change microcapsule has excellent phase-change heat storage performance, photo-thermal conversion performance and magnetism regulation performance. The preparation method is simple in process and employs accessible raw materials, so that the method has extensive industrial application prospect.

Description

technical field [0001] The invention belongs to the technical field of phase-change materials, and relates to a phase-change microcapsule, in particular to a phase-change microcapsule having both magnetic and photothermal conversion properties and a preparation method thereof. Background technique [0002] Phase change materials are a promising class of thermal energy storage materials, which can be used in many fields such as solar energy storage, energy-saving building materials, and preparation of temperature-regulating fibers. Its main phase transition methods include solid-solid phase transition, solid-liquid phase transition, solid-gas phase transition and liquid-gas phase transition. During the phase transition process, under a fixed pressure and temperature, a certain first-order phase occurs per mole of substance. The heat released or absorbed during the transition is called the latent heat of phase transition. [0003] Commonly used phase change materials will und...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K5/06
CPCC09K5/06
Inventor 郭成龙高国芮焦少凯张同星吕文正
Owner CHINA UNIV OF MINING & TECH
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