Stair-stepping electrostatic spinning spray nozzle and electrostatic spinning method thereof

Abstract

The invention provides a stair-stepping electrostatic spinning spray nozzle. The spray head comprises a workbench, an infusion pump and a high voltage electrostatic generator, the workbench is provided with at least one spinning nozzle and at least one collecting groove matched with the at least one spinning nozzle, at least one liquid inlet is formed in each collecting groove, and the at least one liquid inlet is communicated with the infusion pump; the top portion of each collecting groove is provided with one spinning nozzle, each spinning nozzle is provided with a narrow top and a wide bottom, at least one side face of each spinning nozzle is in a stair-stepping distribution structure, or one pair of side faces of each spinning nozzle are in the stair-stepping distribution structures,the side face of each spinning head is provided with a filament outlet cusp, and the top portion of each spinning nozzle is provided with at least one liquid outlet; a receiving plate is arranged above each spinning head, the receiving board is connected with the negative electrode of the high voltage electrostatic generator, and each spinning head is connected with the positive electrode of the high voltage electrostatic generator. The spray nozzle is simple in processing and cannot be blocked, the spray nozzle is easy in washing, the equipment stability is good, by adopting the spray nozzleto carry out the electrostatic spinning, the nanofiber membranes of filaments are good in uniformity and high in product quality.

Description

technical field [0001] The invention relates to the technical field of electrostatic spinning equipment, in particular to a stepped electrostatic spinning nozzle and an electrostatic spinning method thereof. Background technique [0002] Electrospinning is a more popular method of manufacturing nanofibers. It has become a hot spot in the current research on nanofiber manufacturing due to its excellent characteristics such as simple equipment, easy operation, wide source of materials, and no damage to the material body during the process. The nanofibers produced by electrospinning have the characteristics of small diameter, large specific surface area, and high porosity, and have great application potential in the fields of biomedicine, air filtration, and protective clothing. [0003] Electrospinning is a special fiber manufacturing process. Its principle is: the polymer solution or melt is placed in a strong electric field, and the charged droplet will change from a spheric...

AI Technical Summary

Problems solved by technology

The disadvantage of this patent is that the output of this equipment is greatly improved compared with the traditional needle-type electrospinning device, but its production capacity still cannot fully meet the needs of modern industrialization; therefore, the company subsequently applied for an improved patent US20100194000, which further improved the production capacity. The uniformity of the nanofiber membrane produced is also further improved, but unfortunately: due to the complex structure of the spinneret motion device, the manufacturing cost is also greatly increased

The disadvantage of this patent is that the structure of the moving device of the spinneret of the equipment is complicated, and the spinneret hole is easy to be blocked, so that the manufacturing cost and maintenance cost remain high

The disadvantage of this patent is that it is difficult to control the size of the bubbles produced by the device and the bursting of the bubbles, so the diameter of the electrospun filaments produced is very uneven, which affects the quality of the product

The disadvantages of this patent are: 1) when the patented equipment is used alone, it can only form a sheet-shaped nanofiber membrane with a small area, which cannot be applied to actual products, and its application value is not high; 2) in actual production, the patented The equipment must be combined with the invention patent equipment with publication number CN 105316779 (application number: 201510831501.9, applicant: Donghua University, inventor: Qin Xiaohong et al., patent name: a spinning mechanism displacement device for large-scale electrospinning) In use, the umbrella-shaped nozzle runs left and right through the displacement device to collect a cloth-like microporous membrane with a certain width ratio. The nanofiber membrane is also Z-shaped, resulting in uneven thickness of the membrane, resulting in inconsistent filtration efficiency and affecting product quality; 3) The displacement device involved in the patent CN 105316779 is similar to the device used on the earliest melt-blown equipment, such as the patent CN 1911486 The displacement device involved (application number: 200510028590.X, applicant: Shanghai Jiarong Filter Material Co., Ltd., patent name: a kind of melt blown filter cloth and its cloth forming method and filter cloth equipment), the film formed by spraying is as follows: In this patent (that is, the publication number is the patent of CN1911486) of the accompanying drawings in the description figure 1 As shown, the spinneret is also Z-shaped, resulting in poor film quality, so it has not been applied on a large scale, and has basically been eliminated now. Therefore, the umbrella-shaped spinneret + displacement device is used for production 4) The device must have a transmission device, and the instability of the transmission motor is greatly increased in an environment with high-voltage static electricity, which in turn affects the stability of the overall equipment

The weak point of this patent is: 1) because the screw device that goes out silk is rotating all the time, the film that goes out silk formation can be uneven in thickness; The stability is greatly increased, which in turn affects the stability of the overall equipment; 3) The spinning effect is poor and the output is low

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