CN107541798B - Device for eliminating electrostatic influence in electrospinning direct writing - Google Patents

Abstract

The invention relates to a device for electrospinning direct writing that can eliminate the influence of static electricity, and belongs to the field of electrospinning. It mainly includes main channel, three-dimensional motion platform, dispensing nozzle, ion wind nozzle, plastic hose, ion generator, heater and controller. The upper end of the outer wall of the main channel supports a customized gear plate through bearings and spring buckles. The customized gear plate is rotated by a synchronous motor and a synchronous belt. Under the adjustment of the synchronous motor, the ion wind is sprayed to the front end of the spinning path. The invention is a device for electrospinning direct writing that can eliminate the influence of static electricity. The ion wind is used to neutralize the charge on the fiber, thereby reducing or eliminating the influence of electrostatic repulsion; the structure of the nozzle and the controller make the ion wind face the nozzle. The jet that moves obliquely ahead does not affect the electrospinning process. Therefore, using this device, electrostatic repulsion can be reduced to achieve precise positioning without increasing variables.

Description

A device for electrospinning direct writing that can eliminate the influence of static electricity

technical field

The invention relates to a device for electrospinning direct writing capable of eliminating the influence of static electricity, which belongs to the field of electrospinning.

Background technique

In recent years, with the continuous development of science and technology and the deepening of research, micro-nano technology has gradually penetrated into all aspects of daily life. Two-dimensional (2D) nanostructures (such as nanofiber mats, nanowires, nanobelts, etc.) It has unique properties such as small size effect, surface or interface effect, superparamagnetism, etc., and has a wide range of applications in many fields. Compared with 2D micro-nanofibers, three-dimensional micro-nanostructures have attracted extensive attention from scholars due to their significantly improved thickness.

The traditional three-dimensional micro-nano structure preparation methods mainly include compression molding, laser microtechnology, photolithography and 3D printing technology. 3D printing has gradually attracted people's attention as an additive manufacturing technology. However, traditional 3D printing has shortcomings such as slow printing speed, high material consumption, and poor material compatibility when processing macroscopic devices, which cannot meet the development requirements of micro-nano manufacturing. The electrospinning direct writing technology based on the principle of electrohydraulic dynamics has simple process, good material compatibility, high efficiency, and no pollution. It can prepare micro-nano-scale fiber structures, and shows a good application prospect in the manufacture of three-dimensional micro-nano structures.

Although this new type of production process can realize three-dimensional micro-nano structure. However, in the process, there is a problem that cannot be ignored, the phenomenon of electrostatic repulsion. Because the whole process is controlled by the electric field, the fiber will be stretched under the action of the electric field force during the electrospinning process, and the fiber will be charged. Therefore, electrostatic repulsion occurs during fiber deposition, which reduces the printing accuracy.

Contents of the invention

Aiming at the problem of electrostatic repulsion, the present invention proposes a new type of three-dimensional direct-writing spinning device. The nozzle is connected to the ion generator to realize the static elimination of the fiber during the electrospinning process, thereby reducing the influence of static electricity during the printing process.

The technical solution to achieve the above purpose is: a device for electrospinning direct writing that can eliminate the influence of static electricity, mainly including a main flow channel, a heater, a three-dimensional motion platform, a dispensing nozzle, an ion wind nozzle, a plastic hose, and an ion generator , electrostatic generator and electrode plate. The main channel is located above the three-dimensional motion platform, and the main channel is fixed on the frame. The lower end of the main channel is a dispensing nozzle, and the outer wall of the main channel is covered with a heater; Located at the lower end of the worktable of the three-dimensional motion platform, the motor board is insulated from the workbench of the three-dimensional motion platform, and the electrostatic field formed between the electrode plate and the dispensing nozzle makes the filaments ejected from the dispensing nozzle fall on the workbench of the three-dimensional motion platform to complete Direct writing; the ion wind nozzle is installed next to the main channel, and the ion wind nozzle is connected to the ion generator through a plastic hose. The ion wind nozzle sprays ion wind on the three-dimensional motion platform to eliminate the electrostatic charge accumulated on the three-dimensional motion platform.

The invention is a device for electrospinning direct writing that can eliminate the influence of static electricity. The upper end of the main channel outer wall is supported by a bearing and a spring buckle with a customized gear plate. The customized gear plate is rotated by a synchronous motor and a synchronous belt. The customized gear plate is A rack is fixed on the rack, and a connector is installed on the rack. The connector is connected with an ion wind nozzle and a rotary key. The ion generator is connected to the ion wind nozzle through a plastic tube. , Customized gear disc, synchronous belt and synchronous motor are adjusted to spray ion wind to the front end of the spinning path.

The invention is a device for electrospinning direct writing that can eliminate the influence of static electricity. The main channel is fixed, the three-dimensional motion platform moves, and the heater heats the main channel and the glue dispensing nozzle. The customized gear disc sleeve is rotatable with a clearance fit on the main channel, and its moving direction is fixed by deep groove ball bearings and spring buckles. The synchronous motor is connected to it through a synchronous belt and controls its rotation. There can be two racks, one of which is welded with a custom-made gear plate, and the connector can move on this rack to control the distance between the ion wind nozzle and the main channel; the other rack is installed in the connector, Control the distance between the ion wind nozzle and the three-dimensional motion platform. The position of the ion wind nozzle can be adjusted by the movement of the rack, and the angle can be adjusted by the rotation key. The ion spray head is connected with the ion generator through a plastic hose.

The invention is a device for electrospinning direct writing that can eliminate the influence of static electricity. When working, the heater is responsible for heating the main channel and the dispensing nozzle. The material is melted and plasticized in the main channel, and passes through the plunger in the main channel. The molten material is extruded.

The invention is a device for electrospinning direct writing that can eliminate the influence of static electricity. When the three-dimensional motion platform is moving, the controller will calculate the synthetic speed direction vector of X and Y according to the moving speed of the platform in the X and Y directions. In the opposite direction, the control motor drives the customized gear to rotate, so that the ion air outlet is always in the direction of motion.

The invention is a device for electrospinning direct writing that can eliminate the influence of static electricity. The position and angle of the ion air outlet are adjusted through the rack and the rotation key to ensure that the ion wind moves at an oblique forward angle during the electrospinning process. Therefore, the charges of the existing fibers in the front are neutralized to ensure that the subsequent electrospun fiber process is not affected by static electricity. The process parameters are not affected during the whole process, ensuring the normal operation of the electrospinning process.

The present invention is a device for electrospinning direct writing that can eliminate the influence of static electricity. When it exceeds 120°, turn on the switch of the additional ion wind nozzle on the customized gear plate until the original ion wind nozzle normally points to the direction of spinning movement, and when the two ion wind nozzles point to the direction of the sample, turn off the additional ion wind nozzle nozzle.

The invention is a device for electrospinning direct writing that can eliminate the influence of static electricity, neutralizes the charge on the fiber through ion wind, thereby reducing or eliminating the influence of static electricity repulsion. In addition, through the structure of the nozzle and the controller, the ion wind is sprayed towards the oblique front of the relative movement of the nozzle, which does not affect the electrospinning process. Therefore, using this device, it is possible to reduce electrostatic repulsion and achieve precise positioning without increasing variables.

Description of drawings

Fig. 1 is a schematic diagram of a device for electrospinning direct writing that can eliminate the influence of static electricity according to the present invention.

Fig. 2 is a partially enlarged view of a spray head of a device for electrospinning direct writing that can eliminate the influence of static electricity according to the present invention.

In the figure: 1- Main channel, 2- Customized gear plate, 3- Bearing, 4- Spring buckle, 5- Heater, 6- Dispensing nozzle, 7- Three-dimensional motion platform, 8- Ion wind nozzle, 9- Rotary key, 10-plastic hose, 11-connector, 12-rack, 13-ion generator, 14-synchronous motor, 15-synchronous belt.

Detailed ways

It is a device of the present invention that can eliminate the influence of static electricity for electrospinning direct writing, as shown in Figure 1 and Figure 2, it mainly includes a main channel 1, a customized gear plate 2, a bearing 3, a spring buckle 4, and a heater 5 , dispensing nozzle 6, three-dimensional motion platform 7, ion wind nozzle 8, rotary key 9, plastic hose 10, connector 11, rack 12, ion generator 13, synchronous motor 14, synchronous belt 15, electrostatic generator and electrode plate. The electrostatic generator and electrode plates are not shown in the figure. The main channel 1 is located above the three-dimensional motion platform 7, the main channel 1 is fixed on the frame, the lower end of the main channel 1 is a dispensing nozzle 6, the outer wall of the main channel 1 is covered with a heater 5, and the upper end of the main channel 1 outer wall passes through the bearing 3 and the spring buckle 4 are supported with a customized gear plate 2, the customized gear plate 2 is rotated by a synchronous motor 14 and a synchronous belt 15, a rack 12 is fixed on the customized gear plate 2, and a connector is installed on the rack 12 11. The connector 11 is connected with the ion wind nozzle 8 and the rotary key 9. The ion generator 13 is connected to the ion wind nozzle 8 through the plastic tube 10. Under the regulation of gear plate 2, synchronous belt 15 and synchronous motor 14, ion wind is sprayed to the front end of spinning path.

The invention is a device for electrospinning direct writing that can eliminate the influence of static electricity. When working, the heater 5 is responsible for heating the main channel 1 and the dispensing nozzle 6 at the lower end of the main channel 1, and the material is put into the main channel 1 Melting and plasticizing, the molten material is extruded through the plunger in the main channel. When the three-dimensional motion platform 7 is moving, the controller will calculate the opposite direction of the composite speed direction vector of X and Y through the moving speed of the platform in the X and Y directions, and control the synchronous motor 14 to drive the customized gear plate through the synchronous belt 15 2. Rotate so that the air outlet of the ion wind nozzle 8 is always in the direction that the spinning motion advances. The angle of the ion air outlet is adjusted by the rack 12 and the rotary key 9 to ensure that the ion wind moves at an oblique forward angle during the electrospinning process, so that the existing fibers in the front are neutralized to ensure that the electrospun fibers in the back Not affected by static electricity.

Claims (2)

1. An apparatus for eliminating electrostatic influence in electrospinning direct writing, characterized in that: the device mainly comprises a main runner, a heater, a three-dimensional motion platform, a dispensing nozzle, an ion wind nozzle, a plastic hose, an ion generator, an electrostatic generator and an electrode plate, wherein the main runner is positioned above the three-dimensional motion platform and is fixed on a frame, the dispensing nozzle is arranged at the bottommost end of the main runner, and the heater is coated on the outer wall of the main runner; the glue dispensing nozzle is connected with the grounding end of the electrostatic generator, the electrode plate is positioned at the lower end of the workbench of the three-dimensional motion platform, the electrode plate is insulated from the workbench of the three-dimensional motion platform, and the electrostatic field formed between the electrode plate and the glue dispensing nozzle enables wires sprayed out of the glue dispensing nozzle to fall on the workbench of the three-dimensional motion platform to finish direct writing; the ion wind spray head is arranged beside the main runner, is connected with the ion generator through a plastic hose and sprays ion wind on the three-dimensional motion platform; the upper end of the outer wall of the main runner is supported with a customized gear disc through a bearing and a spring buckle, the customized gear disc rotates through a synchronous motor and a synchronous belt, a rack is fixed on the customized gear disc, a connector is mounted on the rack, the connector is connected with an ion wind spray head and a rotary key, an ion generator is connected to the ion wind spray head through a plastic hose, and the ion wind spray head sprays ion wind to the front end of a spinning path under the adjustment of the rotary key, the connector, the rack, the customized gear disc, the synchronous belt and the synchronous motor; the two racks are arranged, one of the racks is welded with the customized gear disc, the connector can move on the rack, and the distance between the ion wind spray head and the main runner is controlled; the other rack is arranged in the connector and controls the distance between the ion wind spray head and the three-dimensional motion platform; when the three-dimensional motion platform moves, the controller calculates the opposite direction of the X, Y synthetic speed direction vector according to the X, Y direction moving speed of the platform, and controls the motor to drive the customized gear disc to rotate, so that the ion air outlet always faces the advancing direction of the spinning motion.

2. An apparatus for electrospinning direct writing capable of eliminating electrostatic influence as defined in claim 1, wherein: an additional ion wind spray head and a switch thereof are additionally arranged on the customized gear plate.

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