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Solvent circulatory-flow coaxial high-voltage static spraying method and device

A technology of high-voltage electrostatic spraying and coaxial nozzles, applied in the field of materials science, can solve the problems of low quality polymer particles, uneven size distribution, large polymer particles, etc., and achieve the effect of small diameter, uniform size and simple preparation process

Pending Publication Date: 2017-05-31
UNIV OF SHANGHAI FOR SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the above-mentioned technical problems in the prior art, the present invention provides a solvent circulation coaxial high-voltage electrostatic spraying method and device, the solvent circulation coaxial high-voltage electrostatic spraying method and device to solve the common problems in the prior art The technical problems of polymer particles prepared by high-voltage electrostatic spraying technology are low quality, too large polymer particles, flat shape, many surface wrinkles, uneven size distribution, and many satellite particles

Method used

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  • Solvent circulatory-flow coaxial high-voltage static spraying method and device
  • Solvent circulatory-flow coaxial high-voltage static spraying method and device

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Embodiment 1

[0027] Example 1 Solvent circulation coaxial high-voltage electrostatic spray device

[0028] like figure 1 , a solvent circulation coaxial high-voltage electrostatic spray device of the present invention, comprising a high-voltage generator 1; a first axial flow pump 2, a second axial flow pump 3, a coaxial nozzle 4, a receiving plate 5, and a high-elastic silicone hose 6 Composition, the first axial flow pump 2 is connected with a first syringe 7, the first syringe 7 is connected with the coaxial nozzle 4 through the high elastic silicone hose 6, and the second The axial flow pump 3 is connected to a second injector 8, the second injector 8 is connected to the coaxial nozzle 4, the high pressure generator 1 is connected to the coaxial nozzle 4, and the coaxial A receiving plate 5 is arranged at the lower end of the spray head 4 .

[0029] The above-mentioned high-pressure generator 1; the first axial flow pump 2, the second axial flow pump 3, the coaxial nozzle 4, the rece...

Embodiment 2

[0034] Particles were prepared by a common electrospray process using a 10% ethyl cellulose solution

[0035] Dissolve 10.0 g of ethyl cellulose powder in 90.0 g of absolute ethanol at room temperature, and shake in a shaker to form a uniform and transparent electrospray working fluid. In the high-pressure coaxial electrostatic spray device, the sheath liquid pump was turned off, the above solution was fixed on the first axial flow pump 2 with a 10 ml syringe, and the first axial flow pump 2 was turned on at a flow rate of 1.0 mL / h. When there are liquid droplets evenly dripping from the nozzle, start the high-voltage electrostatic generator. Under the condition that the applied voltage is 15 kV and the receiving distance is 20 cm, the prepared ethyl cellulose particles are as follows figure 2 shown. The surface of these particles is uneven, the size is not uniform, and there are many satellite particles. The particle diameter is counted, the result is as follows image 3...

Embodiment 3

[0037] Particles were prepared from ethyl cellulose solution with a mass concentration of 10% by solvent circulation coaxial high-voltage electrostatic spray device

[0038] Under the working conditions of the above-mentioned embodiment 2, start the second axial flow pump 3, and regulate the flow rate of the outer sheath circulating working fluid in the second syringe 8 (that is, the volume ratio of acetone and ethanol is a mixed solvent of 50%:50%) 0.2 mL / h, other conditions remain unchanged (core fluid flow rate 1.0mL / h, applied voltage 15kV, receiving distance 20cm) by zooming in and shooting, the results are as follows Figure 4 As shown, the whole solvent circulation high-voltage electrostatic spraying process is uniform and stable. The prepared ethylcellulose granules are as Figure 5shown. These particles are round, uniform in size, smooth in surface, and few satellite particles. The particle diameter is counted, the result is as follows Image 6 As shown, the avera...

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Abstract

The invention provides a solvent circulatory-flow coaxial high-voltage static spraying method. The solvent circulatory-flow coaxial high-voltage static spraying method comprises the following steps: taking a polymer dilute solution as working fluid of a core; taking a single solvent or a mixed solvent which is easily volatilized and is consistent to the working fluid of the core as outer sheath circulatory-flow working fluid; and controlling the fluid to enter a coaxial sprayer, connecting the coaxial sprayer with a high-voltage static field through a wire, and electronically spraying micro-nano particles by the coaxial sprayer under the effect of the high-voltage static electricity. The invention further provides a method for implementing the method. The device comprises a high-pressure generator, a first axial flow pump, a second axial flow pump, the coaxial sprayer, a receiving plate and a high-elasticity silica gel hose. By the solvent circulatory-flow coaxial high-voltage static spraying method, the shortcomings that electronically sprayed polymer particles are too large and are flat, sizes of the distributed particles are uneven, the number of satellite particles is large and the like can be overcome. High-quality polymer nano-particles which are small in diameter, uniform in size distribution, round in shape and smooth in surface can be prepared. The solvent circulatory-flow coaxial high-voltage static spraying method is suitable for industrial expanded production.

Description

technical field [0001] The field of materials science of the present invention relates to a preparation device and method of polymer ultrafine particles, specifically a solvent circulation coaxial high-voltage electrostatic spray method and device. Background technique [0002] High-voltage electrostatic spray technology is a top-down micro-nano manufacturing technology. This technology overcomes the liquid surface tension and viscoelastic force of the liquid droplets at the tip of the nozzle by applying an electric field force to form a jet. Under the combined effect of surface tension, the atomized liquid evaporates quickly due to its huge surface area, and the polymer solute is dried into fine micro-nano particles. The technical process is simple, easy to operate, a wide range of polymer materials can be selected, strong controllability, and continuous industrial production can be realized. The application of this technology to prepare functional micro-nano particles ha...

Claims

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Application Information

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IPC IPC(8): D01D5/00
Inventor 李晓燕余灯广唐沙伟周小琴李辉黄凯
Owner UNIV OF SHANGHAI FOR SCI & TECH
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