A kind of polyethylene glycol/ethyl cellulose phase change microcapsule and preparation method thereof

A technology of ethyl cellulose and phase-change microcapsules, applied in chemical instruments and methods, heat exchange materials, etc., can solve problems such as difficult to degrade, fail to meet the needs of use, environmental pollution, etc., and achieve the effect of easy recycling

Active Publication Date: 2021-01-01
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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  • A kind of polyethylene glycol/ethyl cellulose phase change microcapsule and preparation method thereof
  • A kind of polyethylene glycol/ethyl cellulose phase change microcapsule and preparation method thereof
  • A kind of polyethylene glycol/ethyl cellulose phase change microcapsule and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Add ethyl cellulose and polyethylene glycol (molecular weight: 20,000) with a mass ratio (mass ratio of ethyl cellulose and 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 40m 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 / ethylcellulose phase change microcapsules are obtained by spray drying.

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

Embodiment 2

[0030] Ethyl cellulose and polyethylene glycol (molecular weight: 2000) with a mass ratio of 1:4 were added into dichloromethane and stirred at room temperature for 3 h to obtain a transparent and uniform solution. Set the inlet temperature of the spray drying device to 80°C, the compressed air pressure to 0.20MPa, and the air velocity to 25m 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 / ethylcellulose phase change microcapsules are obtained by spray drying.

[0031] The optical microscope picture of the prepared polyethylene glycol / ethyl cellulose phase change microcapsules is as follows: figure 2 As shown, in the polyethylene glycol / ethylcellulose phase-change microcapsules, ethylcellulose 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 6 μm. The heat of phase chang...

Embodiment 3

[0033] Add ethyl cellulose and polyethylene glycol (molecular weight: 800) with a mass ratio of 1:5 into dichloromethane, and stir at room temperature for 3 h to obtain a transparent and uniform solution. Set the inlet temperature of the spray drying device to 60°C, the compressed air pressure to 0.16MPa, 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 / ethylcellulose phase change microcapsules are obtained by spray drying.

[0034] The optical microscope picture of the prepared polyethylene glycol / ethyl cellulose phase change microcapsules is as follows: image 3 As shown, in the polyethylene glycol / ethylcellulose phase-change microcapsules, ethylcellulose is on the outside, polyethylene glycol is on the inside, and the particles are spherical and uniform in size, with a particle diameter of about 4 μm. The heat of phase change of the microcapsules meas...

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Abstract

The invention discloses a polyethylene glycol / ethyl cellulose phase-changing microcapsule and a preparation method thereof. A core material of the phase-changing microcapsule is polyethylene glycol, awall material is ethyl cellulose, a diameter is 2 to 10 micrometers, and the phase-changing heat is 95 to 135 J / g. The preparation method adopts dichloromethane as a solvent to dissolve the polyethylene glycol and ethyl cellulose and prepares the polyethylene glycol / ethyl cellulose phase-changing microcapsule by virtue of spraying drying. The polyethylene glycol / ethyl cellulose phase-changing microcapsule novel material adopting the ethyl cellulose as a wall material does not release formaldehyde in the use process; and the ethyl cellulose is easy to degrade. Compared with other preparation methods, the spraying drying method adopting the dichloromethane as the solvent does not need additional emulsifier, is easy for recycling the dichloromethane, and is an environment-friendly preparation method. The particle size range of the polyethylene glycol / ethyl cellulose phase-changing microcapsule is 2 to 10 micrometers, the phase changing heat is 95 to 135 J / g, and the application range iswide in the preparation field of the phase-changing material.

Description

technical field [0001] The invention relates to the technical field of phase-change microcapsules, in particular to a polyethylene glycol / ethylcellulose 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 type of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K5/06
CPCC09K5/063
Inventor 李小保王洋李力成叶菊娣
Owner NANJING FORESTRY UNIV
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