CN106757423B - Vibrating multi-tip electrospinning device - Google Patents

Abstract

The invention relates to a vibrating multi-needle-tip electrospinning device, which relates to electrospinning. It is equipped with a power supply, a solution tank, a liquid supply device, a multi-needle point group, a guide sleeve, a telescopic rod, a collection device, a vibration generator, a heating block, a catheter and a vibration transducer. The solution tank is provided with a liquid inlet interface, a liquid outlet interface and an external connection hole; the liquid supply device is connected to the solution tank through the liquid inlet interface and the conduit of the solution tank; the vibration generator is connected through the external connection hole of the solution tank and The vibration transducer is connected to the bottom surface of the base of the multi-needle point group, and the external through hole is sealed with a sealing ring; the bottom surface of the multi-needle point group is connected to the top of the telescopic rod; the bottom of the telescopic rod is fixedly connected to the bottom surface of the solution tank; the heating The blocks are evenly distributed inside the solution tank for heating the melt in melting electrospinning; the multi-needle point group is connected to the power supply through wires; the collection device is arranged directly above the solution tank; the multi-needle point group and the guide sleeve The axis of symmetry coincides with the vibration axis of the vibration transducer.

Description

Vibrating multi-tip electrospinning device

technical field

The invention relates to electrospinning, in particular to a vibrating multi-point electrospinning device.

Background technique

Electrospinning is a popular method for producing nanofibers in recent years. Due to its advantages such as simple process, easy manipulation, low cost, and wide source of materials, the prepared fiber membrane has the characteristics of small diameter, high porosity, large specific surface area, and high permeability, making it the current research nanofiber membrane. Prepare a hot spot. Fibers prepared by electrospinning technology are widely used in textiles, filters, biomedicine, optoelectronic materials, catalysts, sensors and other fields.

Electrospinning is to charge the polymer solution or melt with high-voltage static electricity, and form a Taylor cone under the action of an electric field. When the electric field increases enough to overcome the surface tension of the droplet, a charged jet stream is formed at the tip of the Taylor cone. Under the action of electric field force, viscous resistance, surface tension, etc., through the whipping and stretching of the fiber, the solvent is volatilized, and finally deposited on the collecting device to form a fiber.

Traditional electrospinning uses a single spinning nozzle to prepare fibers, which has low efficiency and cannot achieve mass production of fibers. At present, the method to improve the efficiency of electrospinning nanofibers is mainly to use multi-spinning nozzles for electrospinning (Theron S A, Yarin A L, Zussman E, et al. Multiple jets in electrospinning: experiment and modeling[J]. Polymer, 2005, 46 (9): 2889-2899), and most of them adopt to assemble a plurality of standard injection spinning nozzles, push out solution or melt by mechanical force, and spin by stretching by electric field force. However, the diameter of the nozzle of the standard injection nozzle is mostly in the micron level. Electrospinning with this nozzle is easy to block the nozzle due to solvent volatilization or too fast melt solidification, resulting in interruption of spinning preparation and affecting Production efficiency, at the same time, it is necessary to replace and clean the nozzle, resulting in a reduction in spinning efficiency and an increase in spinning cost. Moreover, for solutions or melts with high viscosity, due to the high surface tension of the solution or melt, it is difficult to overcome the surface tension to form a fine jet. The current solution is mainly to increase the DC voltage applied to the nozzle to make the solution or melt The solution of the melt at the nozzle overcomes the surface tension to form a fine jet, but too high a voltage is likely to cause ionization of the air. In the electrospinning process, in addition to the above-mentioned method of using electric field force to overcome the surface tension of the solution, the use of external force interference is also a method to effectively destroy the surface tension of the solution. Among them, the use of mechanical vibration can enhance the fluidity of the solution, and the use of foreign objects to contact the surface of the solution can pierce the surface and overcome the surface tension, which are all ways to effectively destroy the surface tension. At present, ultrasonic oscillation is used to keep the solution in a dynamic flow state, and to overcome the surface tension of the solution to form multiple jets. However, during the electrospinning process, the position of the standing wave will shift, the position and direction of the Taylor cone formation are not fixed, the uniformity of the jet and the formed fiber is low, and the interference between the jets is easy to occur.

Contents of the invention

In order to solve the above-mentioned technical problems, the present invention provides a vibration pump that can overcome the blocking problem caused by standard injection nozzles and the problem that high-viscosity solutions or melts are difficult to overcome the surface tension to form jets, ensure the stable and rapid injection of multiple jets, and realize the mass production of fibers. Multi-tip electrospinning setup.

The invention is equipped with a power supply, a solution tank, a liquid supply device, a multi-needle point group, a guide sleeve plate, a telescopic rod, a collecting device, a vibration generator, a heating block, a catheter and a vibration transducer. The solution tank is provided with a liquid inlet interface, a liquid outlet interface and an external connection hole; the liquid supply device is connected to the solution tank through the liquid inlet interface and the conduit of the solution tank; the vibration generator is connected to the solution tank through the external connection hole and The vibration transducer is connected to the bottom surface of the base of the multi-needle point group, and the external through hole is sealed with a sealing ring; the bottom surface of the multi-needle point group is connected to the top of the telescopic rod; the bottom of the telescopic rod is fixedly connected to the bottom surface of the solution tank; the heating The blocks are evenly distributed inside the solution tank, and are used for heating the melt in melting electrospinning; the multi-needle point group is connected to the power supply through wires; the collection device is arranged directly above the solution tank; the multi-needle point group, guide sleeve The axis of symmetry coincides with the vibration axis of the vibration transducer.

The solution tank can be an open insulating plastic solution tank, the liquid inlet interface can be set on the top of the solution tank, and the interface is sealed to prevent leakage of the solution.

The spinning solution is added to the solution tank through the liquid supply device, and the liquid level of the spinning solution or melt in the solution tank is kept constant during the spinning process.

The telescopic rods can be distributed under the multi-needle point group, and are used to support the multi-needle point group, so that the multi-needle point group can maintain balance when vibrating.

The vibration frequency of the vibration generator may be 0.1Hz-20kHz, and the amplitude may be 0.001-50mm.

The vibration generator is sealed with the external through hole for connecting the multi-needle point group and the vibration transducer to prevent the solution from leaking.

The multi-point set can be made of conductive material.

The guide sleeve plate may be provided with through holes having the same arrangement and number as the needlepoints of the multi-needlepoint group, which may be made of insulating material and fixed in the solution tank at a certain height.

The array needlepoints of the multiple needlepoint groups respectively pass through the through holes arrayed on the guide sleeve plate to avoid excessive deviation due to the large aspect ratio and poor rigidity of the needlepoints, thereby avoiding the mutual interference between the needlepoints.

There may be at least 2 heating blocks, and at least 2 heating blocks are evenly distributed in the solution tank.

In the present invention, a vibrating multi-needle point electrostatic spinning device is used for continuous spinning in batches, and the vibration generator drives the multi-needle point group to vibrate, and the multi-needle point group punctures the surface of the solution or melt, destroying the surface tension of the solution or melt, plus The electric field intensity at the top of the multi-tip group is the largest, so applying a small voltage on the multi-tip group is enough to overcome the surface tension of the solution or melt, forming multiple jets at the array tip, effectively increasing the spinning rate, The output of electrospinning is increased, and the continuous and large-scale production of nanofibers can be realized. The spray head in the present invention adopts an upward array multi-needle point group, which effectively avoids the clogging phenomenon of the traditional standard injection spray head structure, does not need to replace and clean the spray head frequently, and improves production efficiency. Moreover, since the entire vibrating multi-point electrospinning device is a detachable and open device, it is easier to clean and manipulate.

Description of drawings

Fig. 1 is a schematic structural diagram of Embodiment 1 of the present invention.

Each label in the figure is: 1-vibration generator; 2-free telescopic rod; 3-heating block; 4-solution tank; Device; 9-conduit; 10-liquid supply device; 11-liquid inlet interface; 12-liquid outlet interface; 13-external connection hole; 14-vibration transducer.

Fig. 2 is a top view of Embodiment 1 of the present invention.

Fig. 3 is a top view of the guide sleeve in Embodiment 1 of the present invention.

Fig. 4 is a top view of the multi-tip group in Embodiment 1 of the present invention.

Fig. 5 is a top view of the multi-tip group in Example 2 of the present invention.

Fig. 6 is a schematic structural diagram of Embodiment 3 of the present invention.

Fig. 7 is a top view of the multi-tip group in Embodiment 3 of the present invention.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the described embodiments are only used to illustrate the present invention, not to limit the scope of the present invention.

Example 1:

As shown in Figures 1 and 2, the embodiment of the present invention is provided with a power supply 7, a solution tank 4, a liquid supply device 10, a multi-needle point group 5, a guide plate 6, a telescopic rod 2, a collection device 8, a vibration generator 1, The heating block 3 and the vibration transducer 14. The solution tank 4 is provided with a liquid inlet interface 11, a liquid outlet interface 12 and an external connection hole 13; the liquid supply device 10 is connected to the solution tank 4 through the liquid inlet interface 11 of the solution tank 4; the vibration generator 14 passes through The outer connection hole 13 of the solution tank 4 and the vibration transducer 14 are connected to the bottom surface of the base of the multi-needle point group 5, and the outer connection hole 13 is sealed with a sealing ring; the bottom surface of the multi-needle point group 5 is connected to the top of the telescopic rod 2; The bottom of the telescopic rod 2 is fixedly connected to the bottom surface of the solution tank 4; the heating block 3 is evenly distributed inside the solution tank 4, and is used for heating the melt in melting electrospinning; the multi-needle point group 5 is connected to the power supply 7 through wires; The collection device 8 is arranged directly above the solution tank 4; the multi-needle point group 5, the guide sleeve plate 6 and the symmetry axis of the vibration axis of the vibration transducer 14 coincide with each other.

The solution tank 4 can be an open insulating plastic solution tank, and the liquid inlet interface 11 can be arranged on the top of the solution tank 4, and the interface is sealed to prevent leakage of the solution.

The spinning solution is added to the solution tank through the liquid supply device, and the liquid level of the spinning solution or melt in the solution tank is kept constant during the spinning process.

The telescopic rods can be distributed under the multi-needle point group, and are used to support the multi-needle point group, so that the multi-needle point group can maintain balance when vibrating.

The vibration frequency of the vibration generator may be 0.1Hz-20kHz, and the amplitude may be 0.001-50mm.

The vibration generator is sealed with the external through hole for connecting the multi-needle point group and the vibration transducer to prevent the solution from leaking.

The multi-point set can be made of conductive material.

The guide sleeve plate may be provided with through holes having the same arrangement and number as the needlepoints of the multi-needlepoint group, which may be made of insulating material and fixed in the solution tank at a certain height.

The array needlepoints of the multiple needlepoint groups respectively pass through the through holes arrayed on the guide sleeve plate to avoid excessive deviation due to the large aspect ratio and poor rigidity of the needlepoints, thereby avoiding the mutual interference between the needlepoints.

There may be at least 2 heating blocks, and at least 2 heating blocks are evenly distributed in the solution tank.

The liquid supply device 10 injects solution into the solution tank 4 as required during the spinning process, and keeps the liquid level in the solution tank 4 at a certain height, so that the lowest point of the multi-needle point group during the vibration process is lower than the solution surface position, The highest point is 0.001-50mm higher than the surface of the solution, so that the multi-needle tip group can not only pierce the liquid surface, destroy the surface tension, and form the effect of Taylor cone, but also continuously provide spinning solution or melt to the top of the tip during the spinning process. body. The multi-needle point group 5 is composed of an array needle point and a base; the vibration generator 1 is connected to the bottom surface of the base of the multi-needle point group 5 through an external through hole 13 and a vibration transducer 14, and the vibration generator 1 drives the multi-needle point Group 5 vibrates, and the connecting through hole is sealed with a sealing ring. The multi-needle point group 5 is connected to the positive electrode of the power supply 7 through a wire; the roll-to-roll collection device 8 is composed of a winding drum, an unwinding drum, aluminum foil and a conveyor belt, placed directly above the solution tank 4, and Grounding; the vertical distance between the multi-needle point group 5 and the collecting plate is 5-40cm. As shown in Figure 3, described guide sleeve plate 6 is provided with the through hole of 11 * 11 arrays, and the diameter of through hole is 3mm, is made of insulating material; The grooves are installed in cooperation with each other and are used to fix the guide sleeve plate 6. As shown in Figure 4, the multi-needle point group 5 is composed of 11×11 array needle points, the diameter of the needle point is 350 μm, and it is made of stainless steel; The array of through holes avoids excessive offset due to the large aspect ratio and poor rigidity of the needle tip, thereby avoiding mutual interference between the needle tips. An electrostatic field is formed between the multi-needle point group 5 and the roll-to-roll collection device 8, and the vibrating multi-needle point group 5 pierces the surface of the solution, destroying the surface tension of the solution. Multiple Taylor cones are induced to form multiple jets, which are directed to the roll-to-roll collection device 8 and deposited on the aluminum foil. During the spinning process, with the movement of the conveyor belt, the preparation of large-area and continuous fiber membranes can be realized.

Example 2:

Similar to Example 1, the difference is:

As shown in FIG. 5 , in this embodiment, the base of the multi-tip group is circular, and the needle tips are distributed in a circular array on the circular base. The hole distribution mode of the guide sleeve corresponds to the distribution mode of the needle points.

Example 3:

Similar to Example 1, the difference is:

As shown in Figures 6 and 7, in this embodiment, the multi-needle point group 5 is composed of a plurality of independent needle point groups, and each needle point group is composed of independent vibration generators 1-1, 1-2, 1-3... 1-n drive, each vibration generator can vibrate synchronously or asynchronously. The hole distribution of the guide sleeve plate 6 corresponds to the distribution of the needle points.

Claims (6)

1. The vibrating multi-needle-tip electrostatic spinning device is characterized by being provided with a power supply, a solution tank, a liquid supply device, a multi-needle-tip group, a guide sleeve plate, a telescopic rod, a collecting device, a vibration generator, a heating block, a guide pipe and a vibration transducer; the solution tank is provided with a liquid inlet interface, a liquid outlet interface and an external through hole; the liquid supply device is connected with the solution tank through a liquid inlet interface of the solution tank and a conduit; the vibration generator is connected with the bottom surface of the base of the multi-needle-point group through an external through hole of the solution tank and the vibration transducer, and the external through hole is sealed by a sealing ring; the bottom surface of the multi-needle-point group is connected with the top of the telescopic rod; the bottom of the telescopic rod is fixedly connected to the bottom surface of the solution tank; the heating blocks are uniformly distributed in the solution tank and used for heating the melt in the melt electrospinning; the multi-needle-point group is connected with a power supply through a lead; the collecting device is arranged right above the solution tank; the symmetry axes of the multi-needle-tip group, the guide sleeve plate and the vibration shaft of the vibration transducer are mutually overlapped;

the liquid inlet interface is arranged at the top of the solution tank; the vibration frequency of the vibration generator is 0.1Hz to 20kHz, and the amplitude is 0.001 to 50mm; the vibration generator is connected with the external through hole for connecting the multi-needle-point group and the vibration transducer for sealing treatment; the multi-tip set is made of a conductive material.

2. The vibrating multi-tip electrospinning device of claim 1, wherein the solution tank is an open type insulating plastic solution tank.

3. The vibratory multi-tip electrospinning device of claim 1, wherein the telescoping rods are distributed below the multi-tip set.

4. The vibratory multi-nib electrospinning apparatus of claim 1, wherein the guide sleeve plate has through holes in the same arrangement and number as the plurality of nib groups.

5. The vibratory multi-tip electrospinning device of claim 1, wherein the arrayed tips of the multi-tip set are inserted through the arrayed through holes of the guide sleeve plate, respectively.

6. The vibratory multi-tip electrospinning device of claim 1, wherein the heating blocks are provided in at least 2 blocks, and the at least 2 heating blocks are uniformly distributed in the solution tank.

Images