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Paraffin/cellulose diacetate phase change microcapsule and preparation method thereof

A technology of cellulose diacetate 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 unsatisfactory use requirements, difficult to degrade, and environmental pollution

Active Publication Date: 2018-11-23
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, causing pollution to the environment, and obviously cannot meet the needs of use

Method used

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  • Paraffin/cellulose diacetate phase change microcapsule and preparation method thereof
  • Paraffin/cellulose diacetate phase change microcapsule and preparation method thereof
  • Paraffin/cellulose diacetate phase change microcapsule and preparation method thereof

Examples

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Effect test

Embodiment 1

[0026] Add cellulose diacetate and paraffin at a mass ratio (mass ratio of cellulose diacetate to paraffin, the same below) of 1:3 into acetone, 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 180°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 paraffin / cellulose diacetate phase change microcapsules are obtained by spray drying.

[0027] The SEM image of the prepared paraffin / cellulose diacetate phase change microcapsules is as follows figure 1 As shown, the cellulose diacetate is on the outside, and the paraffin is on the inside. The particles are spherical and relatively uniform in size, with a particle size ranging from 2 to 10 μm. The average particle size measured by Nano-ZS nanometer particle size analyzer is about 4 μm. The DSC f...

Embodiment 2

[0029] Add cellulose diacetate and paraffin at a mass ratio of 1:5 to methyl acetate, 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 170°C, the compressed air pressure to 0.1MPa, and the air velocity to 25m 3 / h, the solution is transported into the spray drying device at a speed of 1.4mL / min, and the paraffin / cellulose diacetate phase change microcapsules are obtained by spray drying.

[0030] The DSC figure of the prepared paraffin / cellulose diacetate phase change microcapsules is as follows image 3 As shown, the heat of phase transformation is 30J / g, and the average particle size is about 5μm.

Embodiment 3

[0032] Add cellulose diacetate and paraffin at a mass ratio of 1:1 to acetone 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 210°C, the compressed air pressure to 0.18MPa, and the air velocity to 40m 3 / h, the solution is transported into the spray drying device at a speed of 4.2mL / min, and the paraffin / cellulose diacetate phase change microcapsules are obtained by spray drying.

[0033] The DSC figure of the prepared paraffin / cellulose diacetate phase change microcapsules is as follows Figure 4 As shown, the heat of phase transformation is 13J / g, and the average particle size is about 3μm.

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Abstract

The invention discloses a paraffin / cellulose diacetate phase change microcapsule and a preparation method thereof. According to the phase change microcapsule, a core material is paraffin, a wall material is cellulose diacetate, the diameter is 2-10 microns, and heat of phase change is 10-45J / g. The preparation method comprises the following steps of by taking acetone or methyl acetate as a solvent, dissolving the paraffin and the cellulose diacetate, and performing spray drying to prepare the paraffin / cellulose diacetate phase change microcapsule. According to the paraffin / cellulose diacetatephase change microcapsule and the preparation method provided by the invention, a paraffin phase change microcapsule novel material with the cellulose diacetate as the wall material cannot release formaldehyde in the use process, and the cellulose diacetate is liable to degrade. Compared with other preparation methods, a spray drying method with the acetone or the methyl acetate as the solvent does not need to add an emulsifier, and the acetone or the methyl acetate is liable to recover, and the preparation method is an environment-friendly preparation method. The paraffin / cellulose diacetatephase change microcapsule has the diameter of 2-10 microns and the heat of phase change of 10-45J / g and has wide application to preparing phase change materials.

Description

technical field [0001] The invention relates to the technical field of phase change microcapsules, in particular to a paraffin / cellulose diacetate phase change microcapsule and a preparation method thereof. Background technique [0002] Paraffin wax is widely used as a phase change material because of its large phase change temperature span, high phase change heat, non-toxicity, corrosion resistance, and low price. 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 composite phas...

Claims

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Application Information

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IPC IPC(8): B01J13/02C09K5/06
CPCB01J13/025C09K5/063
Inventor 李小保周逸成王秦岭李力成叶菊娣
Owner NANJING FORESTRY UNIV
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