Double-slit type spinning device for preparing nanofibers in batches

Abstract

The invention relates to a double-slit type spinning device for preparing nanofibers in batches. The double-slit type spinning device for preparing the nanofibers in batches comprises a metal spray head, an insulating cover plate, a liquid storage mechanism, a liquid supply mechanism, a reel-to-reel collecting mechanism and a high-voltage power source. And a spinning groove is formed in the metal nozzle. The insulating cover plate is arranged on the side, provided with the spinning groove, of the metal nozzle, and the insulating cover plate is matched with the metal nozzle to define two slit tips. The liquid storage mechanism is used for storing spinning liquid. The input end of the liquid supply mechanism is connected with the liquid storage mechanism, and a liquid supply pipe used for supplying spinning liquid is arranged between the liquid supply mechanism and one end of the spinning groove. The roll-to-roll collecting mechanism is arranged above the tip ends of the two slits, comprises a piece of base cloth capable of being controlled to move and is used for receiving spinning filaments formed by the spinning solution to form a nanofiber membrane. And the high-voltage power supply is electrically connected with the metal spray head and the roll-to-roll collecting mechanism and is used for forming an electrostatic field between the metal spray head and the roll-to-roll collecting mechanism.

Description

Technical Field

[0001] The present invention relates to the technical field of electrostatic spinning, and in particular to a double-slit spinning device for batch preparation of nanofibers. Background Art

[0002] Traditional electrostatic needle spinning mostly relies on a single needle or a small number of multi-needle structures. Not only is the output low and it is difficult to meet the needs of large-scale preparation, but also because the high viscosity, high molecular weight and volatile spinning solution has poor fluidity in the needle and the solvent is volatile, it is very easy to cause the spinneret hole to become clogged, resulting in spinning interruption, fiber breakage, and frequent surface defects, which seriously affects the production efficiency and quality of nanofibers and is difficult to meet high-quality production needs. Summary of the Invention

[0003] The purpose of the present invention is to provide a double-slit spinning device for batch preparation of nanofibers, which can concentrate charges and increase the utilization rate of electric field force by forming a double-slit tip between the metal nozzle and the insulating cover, so that the spinning solution can easily form a stable Taylor cone and produce multiple uniform jets, significantly improving the spinning efficiency and output; the insulating cover accurately defines the filament outlet area and prevents the volatilization of the spinning solution and the generation of defective fibers; the liquid storage mechanism and the liquid supply mechanism cooperate to ensure the continuous renewal of the spinning solution and the controllable flow rate; the roll-to-roll collection mechanism realizes the continuous collection of nanofiber membranes, ensuring uniform membrane thickness and compact equipment structure.

[0004] To achieve the above-mentioned object, the present invention provides a double-slit spinning device for batch production of nanofibers, comprising:

[0005] A metal nozzle, wherein a spinning groove is provided in the metal nozzle;

[0006] An insulating cover plate is provided on a side of the metal nozzle where the spinning groove is provided, and the insulating cover plate cooperates with the metal nozzle to define two slit tips;

[0007] A liquid storage mechanism, used for storing spinning liquid;

[0008] a liquid supply mechanism, wherein an input end of the liquid supply mechanism is connected to the liquid storage mechanism, and a liquid supply pipe for supplying spinning liquid is provided between the liquid supply mechanism and one end of the spinning groove;

[0009] a roll-to-roll collecting mechanism, disposed above the two slit tips, comprising a controllably movable base cloth for receiving spinning filaments formed from the spinning solution to form a nanofiber membrane;

[0010] A high-voltage power supply is electrically connected to the metal nozzle and the roll-to-roll collection mechanism, and is used to form an electrostatic field between the metal nozzle and the roll-to-roll collection mechanism.

[0011] Optionally, the insulating cover plate is an I-shaped structure.

[0012] Optionally, the slot width of the spinning groove is the same as the width of the metal nozzle.

[0013] Optionally, the gap width of the slit tip is within 3 mm.

[0014] Optionally, the thickness of the insulating cover is 5mm-15mm.

[0015] Optionally, the liquid storage mechanism is provided with a stirring blade for stirring the spinning solution.

[0016] Optionally, a reflux pipe is provided between the other end of the spinning groove and the liquid storage mechanism.

[0017] Optionally, the roll-to-roll collecting mechanism further includes a winding roller and an unwinding roller that rotate in a controlled manner, and the base fabric is wound between the unwinding roller and the winding roller.

[0018] Optionally, the rotation speed of the winding roller is 100-1000r / min.

[0019] The beneficial effects of the present invention are as follows: by providing a spinning groove on the metal nozzle and cooperating with an insulating cover plate, two slit tips are defined to form, so that the spinning solution can better utilize the tip discharge principle at the double slit tips under the action of a high-voltage power supply. The charge distribution at the double slit tips is more concentrated, the electric field force utilization rate is higher, the surface tension of the spinning solution is effectively reduced, and the spinning solution is easier to overcome the electric field resistance, thereby stably forming a Taylor cone and generating multiple uniform jets, greatly increasing the number of jets; the double slit tips can form two rows of continuous jets to achieve efficient continuous spinning, which not only meets the needs of large-scale production of nanofibers but also is easy to operate; the non-conductive insulating cover plate can accurately define the filament output area at the slit tips on both sides of the spinning groove and effectively prevent the spinning solution from volatilizing, solidifying, and generating defective fibers in other areas; the liquid storage mechanism cooperates with the liquid supply mechanism to continuously stir and circulate the spinning solution in the metal nozzle to accurately control the flow rate and avoid excessive or insufficient liquid supply; the roll-to-roll collection mechanism can realize the continuous collection of the nanofiber membrane on the base cloth, ensuring that the thickness of the nanofiber membrane layer is uniform and the equipment is compact.

[0020] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic structural diagram of a double-slit spinning device for batch production of nanofibers according to one embodiment of the present invention;

[0022] Figure 2 This is a schematic structural diagram of a metal nozzle of a double-slit spinning device for batch production of nanofibers according to one embodiment of the present invention;

[0023] Figure 3 This is a schematic structural diagram of an insulating cover plate of a double-slit spinning device for batch production of nanofibers according to an embodiment of the present invention;

[0024] In the figure: 1. Metal nozzle; 11. Spinning groove; 12. Slit tip; 2. Insulating cover; 3. Liquid storage mechanism; 4. Liquid supply mechanism; 5. Roll-to-roll collection mechanism; 51. Base fabric; 52. Winding roller; 53. Unwinding roller; 6. High-voltage power supply; 7. Liquid supply pipe; 8. Return pipe. DETAILED DESCRIPTION

[0025] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0026] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0027] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be internal communication between two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0028] See Figures 1 to 3A double-slit spinning device for batch production of nanofibers shown in a preferred embodiment of the present application includes a metal nozzle 1, an insulating cover 2, a liquid storage mechanism 3, a liquid supply mechanism 4, a roll-to-roll collection mechanism 5 and a high-voltage power supply 6. A spinning groove 11 is provided in the metal nozzle 1. The insulating cover 2 is arranged on the side of the metal nozzle 1 where the spinning groove 11 is provided, and the insulating cover 2 cooperates with the metal nozzle 1 to define two slit tips 12. The liquid storage mechanism 3 is used to store the spinning solution. The input end of the liquid supply mechanism 4 is connected to the liquid storage mechanism 3, and a liquid supply pipe 7 for supplying the spinning solution is provided between the liquid supply mechanism 4 and one end of the spinning groove 11. The roll-to-roll collection mechanism 5 is arranged above the two slit tips 12, and includes a controllably movable base cloth 51 for receiving the spinning filaments formed by the spinning solution to form a nanofiber membrane. The high-voltage power supply 6 is electrically connected to the metal nozzle 1 and the roll-to-roll collection mechanism 5, and is used to form an electrostatic field between the metal nozzle 1 and the roll-to-roll collection mechanism 5.

[0029] According to the solution of the embodiment of the present invention, by opening a spinning groove 11 on the metal nozzle 1 and cooperating with the insulating cover 2, two slit tips 12 are defined to form, so that under the action of the high-voltage power supply 6, the spinning solution can better utilize the tip discharge principle at the double slit tip 12, the charge distribution at the double slit tip 12 is more concentrated, the electric field force utilization rate is higher, and the surface tension of the spinning solution is effectively reduced, making it easier for the spinning solution to overcome the electric field resistance, thereby stably forming a Taylor cone and generating multiple uniform jets, greatly increasing the number of jets; the double slit tip 12 can form two rows of continuous jets to achieve high efficiency Continuous spinning not only meets the needs of large-scale production of nanofibers, but also is easy to operate; the non-conductive insulating cover 2 can accurately limit the filament production area to the slit tips 12 on both sides of the spinning groove 11, and effectively prevent the spinning solution from volatilizing, coagulating, and producing defective fibers in other areas; the liquid storage mechanism 3 and the liquid supply mechanism 4 cooperate to continuously stir and circulate the spinning solution in the metal nozzle 1 to accurately control the flow rate and avoid excessive or insufficient liquid supply; the roll-to-roll collection mechanism 5 can realize the continuous collection of the nanofiber membrane on the base cloth 51, ensuring that the thickness of the nanofiber membrane layer is uniform and the equipment is compact.

[0030] The following is a detailed description with specific embodiments:

[0031] Further, see Figure 3 The insulating cover plate 2 has an I-shaped structure. Specifically, the insulating cover plate 2 is made of plastic. The I-shaped insulating cover plate 2 utilizes its central beam to cooperate with the metal nozzle 1 to form a double-slit tip 12, thereby precisely limiting the spinning solution to overflow only from the double-slit tip 12, preventing the formation of unstable jets in other areas, thereby further improving the uniformity of fiber formation and the efficiency of spinning.

[0032] Further, see Figure 2The slot width of the spinning groove 11 is the same as the width of the metal nozzle 1, which can better form the double slit tip 12, ensuring that the electric field distribution at the double slit tip 12 is symmetrical and consistent, thereby generating uniform charge distribution and stable, multi-strand and equal-intensity jets, thereby improving the fiber diameter distribution.

[0033] Specifically, the gap width of the slit tip 12 is within 3 mm. The thickness of the insulating cover 2 is 5 mm to 15 mm. Controlling the gap of the double slit tips 12 to be within 3 mm can enhance the electric field concentration, reduce the surface tension resistance of the spinning solution, make it easier for the spinning solution to break through the electric field force to form a jet, and increase the number and stability of the jet. By limiting the thickness of the insulating cover 2, while ensuring sufficient mechanical strength, the volatilization of the spinning solution by the surrounding environment is blocked to the greatest extent, the full fluidity of the spinning solution is maintained, and the excessive evaporation of the spinning solution caused by the insulating cover 2 being too thin or the influence of the jet position due to being too thick is avoided.

[0034] Furthermore, a stirring blade for stirring the spinning solution is provided in the liquid storage mechanism 3. The stirring blade rotates at high speed in the liquid storage mechanism 3, continuously stirring the high-viscosity spinning solution, preventing solidification and precipitation, and ensuring that the viscosity of the spinning solution delivered to the metal nozzle 1 is constant and uniform.

[0035] See Figure 1 A reflux pipe 8 is provided between the other end of the spinning groove 11 and the liquid storage mechanism 3. The spinning solution that has not formed a jet is returned to the liquid storage mechanism 3 by reflux, forming a circulating flow, avoiding solution deposition and dryness blockage caused by the static area, and improving system stability.

[0036] See Figure 1 The roll-to-roll collection mechanism 5 also includes a controlled-rotation take-up roller 52 and a discharging roller 53. The base fabric 51 is wound between the discharging roller 53 and the take-up roller 52. Specifically, the take-up roller 52 rotates at a speed of 100-1000 rpm. The base fabric 51 continuously moves between the two rollers to collect the spun filaments. By adjusting the speeds of the discharging roller 53 and the take-up roller 52, the thickness and tension of the fiber film can be precisely controlled to meet the requirements of different process parameters.

[0037] During spinning, the spinning solution is placed in the liquid storage mechanism 3 and continuously stirred by the stirring blades to prevent it from solidifying. The solution is then continuously transported by the liquid supply mechanism 4 through the liquid supply pipe 7 to the spinning groove 11 of the metal nozzle 1. Under the action of high-voltage static electricity, the spinning solution forms a Taylor cone and a jet at the double-slit tip 12. The electrostatic field draws the solution into spinning filaments, which are finally collected by the roll-to-roll collection mechanism 5 and placed on the base fabric 51 to form a nanofiber membrane.

[0038] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0039] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by the appended claims.

Claims

1. A double-slit spinning device for batch production of nanofibers, characterized in that: include: A metal nozzle, wherein a spinning groove is provided in the metal nozzle; An insulating cover plate is provided on a side of the metal nozzle where the spinning groove is provided, and the insulating cover plate cooperates with the metal nozzle to define two slit tips; A liquid storage mechanism, used for storing spinning liquid; a liquid supply mechanism, wherein an input end of the liquid supply mechanism is connected to the liquid storage mechanism, and a liquid supply pipe for supplying spinning liquid is provided between the liquid supply mechanism and one end of the spinning groove; a roll-to-roll collecting mechanism, disposed above the two slit tips, comprising a controllably movable base cloth for receiving spinning filaments formed from the spinning solution to form a nanofiber membrane; A high-voltage power supply is electrically connected to the metal nozzle and the roll-to-roll collection mechanism, and is used to form an electrostatic field between the metal nozzle and the roll-to-roll collection mechanism.

2. The double-slit spinning device for batch production of nanofibers according to claim 1, characterized in that: The insulating cover plate is an I-shaped structure.

3. The double-slit spinning device for batch production of nanofibers according to claim 1, characterized in that: The slot width of the spinning groove is the same as the width of the metal nozzle.

4. The double-slit spinning device for batch production of nanofibers according to claim 1, characterized in that: The gap width of the slit tip is within 3 mm.

5. The double-slit spinning device for batch production of nanofibers according to claim 1, characterized in that: The thickness of the insulating cover plate is 5 mm to 15 mm.

6. The double-slit spinning device for batch production of nanofibers according to claim 1, characterized in that: The liquid storage mechanism is provided with a stirring blade for stirring the spinning solution.

7. The double-slit spinning device for batch production of nanofibers according to claim 1, characterized in that: A reflux pipe is provided between the other end of the spinning groove and the liquid storage mechanism.

8. The double-slit spinning device for batch production of nanofibers according to claim 1, characterized in that: The roll-to-roll collecting mechanism further comprises a winding roller and an unwinding roller which rotate in a controlled manner, and the base cloth is wound between the unwinding roller and the winding roller.

9. The double-slit spinning device for batch production of nanofibers according to claim 8, characterized in that: The rotation speed of the winding roller is 100-1000r / min.

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