Multi-cavity drum-type electrostatic spinning device and using method thereof

Abstract

The invention discloses a multi-cavity drum-type electrostatic spinning device and a using method thereof, and relates to the technical field of electrostatic spinning. The device comprises cylindrical core, a cylindrical shell, partitioning plates, a rotating shaft, a cylindrical receiving device, a driving device and a high-voltage static generator. The cylindrical core is of a solid structure,the cylindrical shell is of a hollow structure, an annular solution groove is formed by the side face of the cylindrical core, the bottom faces of the partitioning plates and the side face of the cylindrical shell, and miniature holes are uniformly formed in the side face of the cylindrical shell; the partitioning plates are circular-ring flat plates and are installed between the cylindrical coreand the cylindrical shell and distributed at equal intervals; the upper portion of the rotating shaft is fixedly connected with the bottom of the cylindrical shell, and the lower portion of the rotating shaft can be in drive connection with the driving device; a positive electrode of the high voltage static generator is connected with the bottom of the cylindrical shell, and a negative electrode of the high voltage static generator is connected with the cylindrical receiving device. The device has the advantages that the uniformity of a jet velocity and spinning is good, electrostatic spinningefficiency is high, and the thickness of a produced nanometer fiber membrane is uniform.

Description

technical field [0001] The invention relates to a multi-cavity drum-type electrostatic spinning device and a use method thereof, belonging to the technical field of electrostatic spinning. Background technique [0002] Electrospinning technology began in the 1930s and is a common method for the direct production of nanofibers. The method has short technological process and simple operation, and its products are mostly used in high-tech fields such as high-efficiency filter materials, biomedical materials, and chemical sensors. [0003] Electrospinning is one of the most effective ways to prepare nanofiber materials. Compared with the preparation techniques of nanomaterials such as stretching method, template synthesis method, and self-assembly, electrospinning has the advantages of simple operation, short preparation process, and wide selection of materials. advantage. Compared with traditional textile fiber materials, due to their extremely small scale, nanofibrous materi...

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Problems solved by technology

However, experiments have proved that when the metal rod rotates in the polymer solution, under the action of high-voltage static electricity, it will splash around and cannot be collected centrally in the receiving device.

At the same time, according to the research on the instability of liquid free surface by experts such as Simon L.Gorenr and S.Tomotika, it is believed that the formation of droplets has a great relationship with the diameter of the free surface of the electrode, and only when the diameter of the electrode is smaller than a certain critical value can a stable If the diameter of the electrode metal rod provided by the above patent is large, the solution will become a film on the surface of the electrode, which is difficult to stretch into filaments; but when the diameter is small, it cannot meet the purpose of mass production; in addition , whether it is a single nozzle, multiple nozzles, rotary nozzles or composite nozzles, the spinning device is mostly conductive metal material. In the high-voltage electrostatic field, due to the short receiving distance, the electric field between the device components will interfere with each other, even under voltage When it is high, it is easy to break down and cannot be spun, which greatly affects the efficiency of electrospinning and the quality of nanofibers

[0006] The national patent ZL201810355658.2 discloses a nozzle-less electrospinning device and its use method, which relies on the gravity of the liquid and the centrifugal force of the drum rotation to achieve batch preparation of electrospun nanofibers, but its largest The disadvantage is that the drum is placed vertically, resulting in different pressures on the micropores at different heights on the drum, which in turn leads to great differences in the spinning speed and spinning diameter, thus affecting the stability and uniformity of spinning

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