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Polyethylene glycol/cellulose triacetate phase change microcapsule and preparation method thereof

A technology of cellulose triacetate and phase change microcapsules, which is applied in the direction of microcapsule preparation, microsphere preparation, chemical instruments and methods, etc., and can solve problems such as difficult degradation, unsatisfactory use requirements, environmental pollution, etc.

Active Publication Date: 2018-12-07
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the most common wall materials are polymer materials such as melamine resin, urea-formaldehyde resin, etc., which will release formaldehyde or be difficult to degrade during use, pollute the environment, and obviously cannot meet the needs of use

Method used

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  • Polyethylene glycol/cellulose triacetate phase change microcapsule and preparation method thereof
  • Polyethylene glycol/cellulose triacetate phase change microcapsule and preparation method thereof
  • Polyethylene glycol/cellulose triacetate phase change microcapsule and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Add cellulose triacetate and polyethylene glycol (molecular weight: 8000) with a mass ratio (mass ratio of cellulose triacetate to polyethylene glycol, the same below) of 1:3 into dichloromethane, and stir at room temperature After 3h, a transparent and homogeneous solution was obtained. Set the inlet temperature of the spray drying device to 100°C, the compressed air pressure to 0.18MPa, and the air velocity to 30m 3 / h, with the speed of 1.4mL / min, the solution is transported into the spray drying device by the peristaltic pump, and the polyethylene glycol / cellulose triacetate phase change microcapsules are obtained by spray drying.

[0028] The optical microscope image of the prepared polyethylene glycol / cellulose triacetate phase-change microcapsules is as follows figure 1 As shown, in the polyethylene glycol / cellulose triacetate phase-change microcapsules, cellulose triacetate is on the outside, polyethylene glycol is on the inside, and the particles are spherical...

Embodiment 2

[0030] Add cellulose triacetate and polyethylene glycol (molecular weight: 800) with a mass ratio of 1:5 into dichloromethane, and stir at room temperature for 3 hours to obtain a transparent and uniform solution. Set the inlet temperature of the spray drying device to 60°C, the compressed air pressure to 0.14MPa, and the air velocity to 40m 3 / h, with the speed of 4.2mL / min, the solution is transported into the spray drying device by the peristaltic pump, and the polyethylene glycol / cellulose triacetate phase change microcapsules are obtained by spray drying.

[0031] The optical microscope image of the prepared polyethylene glycol / cellulose triacetate phase-change microcapsules is as follows figure 2 As shown, in the polyethylene glycol / cellulose triacetate phase-change microcapsules, cellulose triacetate is on the outside, polyethylene glycol is on the inside, and the particles are spherical and uniform in size, with a particle size ranging from 5 to 10 μm. The heat of ph...

Embodiment 3

[0033] Add cellulose triacetate and polyethylene glycol (molecular weight: 1000) at a mass ratio of 1:4 into dichloromethane, and stir at room temperature for 3 hours to obtain a transparent and uniform solution. Set the inlet temperature of the spray drying device to 80°C, the compressed air pressure to 0.16MPa, and the air velocity to 20m 3 / h, with the speed of 2.8mL / min, the solution is transported into the spray drying device by the peristaltic pump, and the polyethylene glycol / cellulose triacetate phase change microcapsules are obtained by spray drying.

[0034] The optical microscope image of the prepared polyethylene glycol / cellulose triacetate phase-change microcapsules is as follows image 3 As shown, in the polyethylene glycol / cellulose triacetate phase-change microcapsules, cellulose triacetate is on the outside, polyethylene glycol is on the inside, and the particles are spherical and relatively uniform in size, with a particle size ranging from 2 to 15 μm. The h...

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Abstract

The invention discloses a polyethylene glycol / cellulose triacetate phase change microcapsule and a preparation method thereof. According to the phase change microcapsule, the core material is polyethylene glycol, the wall material is cellulose triacetate, the diameter is 2-15 microns, and heat of phase change is 100-160J / g. The preparation method comprises the following steps: by taking dichloromethane as a solvent, dissolving polyethylene glycol and cellulose triacetate, and performing spray drying, thereby obtaining the polyethylene glycol / cellulose triacetate phase change microcapsule. According to the novel polyethylene glycol phase change microcapsule material taking the cellulose triacetate as the wall material, formaldehyde is not released in the application process, and the cellulose triacetate is easily degradable. Compared with other preparation methods, the spray drying method taking the dichloromethane as the solvent does not need an additional emulsifier, is capable of easily recovering the dichloromethane, and is an environment-friendly preparation method. The polyethylene glycol / ethyl cellulose phase change microcapsule has the particle size range of 2-15 microns andthe heat of phase change of 100-160J / g, and has wide application in preparation of the phase change material.

Description

technical field [0001] The invention relates to the technical field of phase-change microcapsules, in particular to a polyethylene glycol / cellulose triacetate phase-change microcapsule and a preparation method thereof. Background technique [0002] As a common phase change material, polyethylene glycol has received extensive attention and research because of its wide range of phase transition temperature and high phase transition heat. However, it has disadvantages such as easy leakage during use, large volume change during phase transition, and low thermal conductivity. In view of the above shortcomings, the microcapsule technology that uses film-forming materials to coat phase change materials to form phase change microcapsules can prevent the leakage of phase change materials and contact with the external environment, control the volume change during phase change, and increase the heat transfer area. Therefore, phase change microcapsules have become the most developed t...

Claims

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Application Information

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IPC IPC(8): B01J13/04C09K5/06
CPCB01J13/043C09K5/063
Inventor 李小保周逸成王秦岭李力成叶菊娣
Owner NANJING FORESTRY UNIV
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