Magnetic phase change microcapsule and preparation method thereof

A magnetic phase change and microcapsule technology, which is applied in the field of light industry technology and functional materials, can solve the problems of thermal conductivity and other problems, achieve the effect of increasing thermal conductivity, improving latent heat of phase change, and broadening the application field

Active Publication Date: 2019-10-08
三维印制(厦门)新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the wall material of the phase change microcapsule has a heat insulation effect, and when heat is transferred to the core material, it is blocked by the wall material, and the heat conduction is affected.

Method used

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  • Magnetic phase change microcapsule and preparation method thereof
  • Magnetic phase change microcapsule and preparation method thereof
  • Magnetic phase change microcapsule and preparation method thereof

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0039] This embodiment provides a method for preparing magnetic phase-change microcapsules, comprising the following steps:

[0040] 1) Preparation of oil-in-water emulsion: Add 12g of paraffin and 10g of sodium salt of styrene-maleic anhydride copolymer (also known as SMAHNa emulsifier) ​​in 100ml of deionized water successively, melt at a water bath temperature of 70° C. Stir and emulsify at a rotating speed for 2 hours to form a uniformly mixed and stable oil-in-water emulsion; then add citric acid / acetic acid solution with a mass fraction of 10%, adjust the pH value to 4-5, and stir evenly;

[0041] 2) Preparation of prepolymer solution: 0.3g urea, 2.7g melamine, 4.6g formaldehyde, 0.9g nanometer Fe solution were mixed and 25ml deionized water was added, stirred evenly; Ethanolamine solution, adjust the pH value to 8-9, mechanically stir and react in a constant temperature water bath at 70°C and 500rpm for 30min to obtain a prepolymer solution;

[0042] 3) In-situ polymer...

Embodiment 2

[0044]This embodiment provides a method for preparing magnetic phase-change microcapsules, comprising the following steps:

[0045] 1) Preparation of oil-in-water emulsion: sequentially add 12 g of paraffin and 10 g of sodium salt of styrene-maleic anhydride copolymer to 100 ml of deionized water, melt at a water bath temperature of 70° C., stir and emulsify at a speed of 900 rpm for 2 h to make it Form a well-mixed and stable oil-in-water emulsion; then add a citric acid / acetic acid solution with a mass fraction of 10%, adjust the pH value to 4-5, and stir evenly;

[0046] 2) Preparation of prepolymer solution: 6.6g formaldehyde, 3g melamine, 0.8g nano Fe 3 o 4 The solution was mixed and 25ml of deionized water was added, and stirred evenly; then a triethanolamine solution with a mass fraction of 10% was added dropwise to it, the pH value was adjusted to 8-9, and the reaction was mechanically stirred in a constant temperature water bath at 70°C and 500rpm for 30min. Obtain ...

Embodiment 3

[0049] This embodiment provides a method for preparing magnetic phase-change microcapsules, comprising the following steps:

[0050] 1) Preparation of oil-in-water emulsion: sequentially add 12g of n-octadecane and 11g of sodium salt of styrene-maleic anhydride copolymer to 100ml of deionized water, melt at a water bath temperature of 70°C, and stir and emulsify at a speed of 600rpm for 2h to form a uniformly mixed and stable oil-in-water emulsion; then add a citric acid / acetic acid solution with a mass fraction of 10 wt%, adjust the pH value to 4-5, and stir evenly;

[0051] 2) Preparation of prepolymer solution: 7g formaldehyde, 3g melamine, 0.8g nano-CrO 2 The solution was mixed and 25ml of deionized water was added, and stirred evenly; then a triethanolamine solution with a mass fraction of 10% was added dropwise to it, the pH value was adjusted to 8-9, and the reaction was mechanically stirred in a constant temperature water bath at 70°C and 500rpm for 30min. Obtain prep...

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Abstract

The invention relates to a magnetic phase change microcapsule and a preparation method thereof. The preparation method comprises the steps that an oil-in-water emulsion is prepared; a prepolymer solution is prepared; in-situ polymerization is carried out; and a magnetic additive is further added. According to the phase change microcapsule, a wall material of the phase change microcapsule can protect a core material well, and the phase change is enabled to play a better role; and magnetic materials such as Fe/Fe3O4/CrO2 are doped into the wall material to enable the thermal conductivity of themicrocapsule to be increased and the latent heat of phase change to be increased, and the magnetic property is imparted to the magnetic phase change microcapsule, so that the functions of heat conduction, heat preservation and magnetic property are achieved.

Description

technical field [0001] The invention belongs to the field of light industry technology and functional materials, and relates to a magnetic phase change microcapsule and a preparation method thereof. Background technique [0002] Microcapsule preparation technology originated in the 1930s. NCR Corporation of the United States put the first generation of carbonless copy paper made of microcapsules on the market for the first time in 1954, creating a new era of microcapsule technology. In the 1960s, the use of phase separation technology to encapsulate substances in polymer materials made microcapsules capable of timed release of drugs, which promoted the development of microcapsule technology. In the mid-1970s, microencapsulation technology developed rapidly, during which many microencapsulated products and processes appeared. By the mid-1980s, microcapsule technology had been widely used in medicine, agriculture and chemical industry. Due to the great advantages brought by ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06C09K5/14C08G12/32
CPCC08G12/32C09K5/063C09K5/14
Inventor 孙志成李芙蓉杜晓阳焦守政问金月陈寅杰李路海
Owner 三维印制(厦门)新材料有限公司
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