A kind of 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 difficult degradation, environmental pollution, and inability to meet the use requirements
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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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