Enhanced Flash & Electrostatic Composite Spinning Equipment

Abstract

The objective of the present invention is to provide an enhanced flash electrostatic composite spinning equipment. [Solution] The present invention provides an intensified flash electrostatic composite spinning equipment comprising a flash spinning section, an electrostatic spinning section and a grounded collecting conveyor belt (9), the flash spinning section further comprising a flash injection unit (5) preparing a grounded first nozzle, the electrostatic spinning section comprising a high voltage power supply (8) and an electrostatic injection unit (6) preparing a second nozzle connected to the high voltage power supply, the first nozzle and the second nozzle being positioned together on the collecting conveyor belt facing each other with a distance D of 15 to 40 cm. The equipment has a simple structure and is applicable to the production of a fiber material that is not prone to delamination and has excellent waterproofness and gas permeability.

Description

[Technical field]

[0001] The present invention generally relates to new materials and advanced equipment technology, and particularly to an intensive flash electrostatic composite spinning equipment. [Background technology]

[0002] Ultra-high molecular weight polyethylene material obtained only by flash spinning has excellent strength, waterproofness and gas permeability and is widely used in fields such as medicine, packaging and construction. However, when used in special cases, it still has problems such as easy delamination and relatively low waterproofness and gas permeability.

[0003] Chinese patent CN201710805631.4 discloses a type of flash spinning equipment and its spinning method, which provides a method of narrowing the fiber diameter and improving the fiber performance through two-stage drawing, but the entanglement degree and void ratio of the fiber material produced by this method are still insufficient, so the existing problems cannot be solved.

[0004] Therefore, research into the manufacturing method of composite ultrafine nanofibers by flash electrospinning is of great significance in overcoming the problems of conventional materials, such as their tendency to delaminate and their low waterproofness and gas permeability. Summary of the Invention [Problem to be solved by the invention]

[0005] In order to solve the problems in the prior art, the present invention provides a method for producing composite ultrafine nanofibers by flash electrospinning and an enhanced flash electrospinning equipment. [Means for solving the problem]

[0006] In response to the above problems, the present invention selects the following means for solving the problems. The manufacturing method of composite ultra-fine nanofibers by flash electrospinning is to manufacture nanofibers by electrospinning and micron fibers by flash spinning, by placing an electrostatic nozzle and a flash nozzle facing each other with a distance of 15~40cm on the collecting conveyor belt, and at the same time, connecting the electrostatic nozzle to a high voltage power supply and grounding the flash nozzle and the collecting conveyor belt, and manufacturing ultra-fine nanofibers by the flash electrostatic composite spinning method. Meanwhile, if the nozzle distance is too narrow, the strong flash airflow will blow away the electrostatically discharged nanofilaments, and if it is too wide, the flash discharged micron fibers and the electrostatically discharged nanofibers will not be able to be entangled well. In fact, the flash is an instantaneous discharge pressure, and a strong airflow like the discharge pressure of a high pressure cooker blows the nanofibers coming from the front, changes their direction, randomly entangles them with the flash discharged fibers, and then falls to the collecting conveyor belt together by gravity, that is, the electrostatic nozzle and the flash nozzle can be placed facing each other, but the electrostatically discharged fibers will eventually be deposited on the collecting conveyor belt, not on the flash nozzle. On the other hand, the high voltage electric field involved in electrospinning charges the flash-extruded fibers, which then change direction due to the repulsive force of the electric field, so that the flash-spun fibers are also ultimately deposited on a collection conveyor belt rather than on an electrostatic nozzle.

[0007] Preferred embodiments of the present invention are set forth below.

[0008] In the method for producing composite ultrafine nanofibers by flash electrospinning, the electrospinning solution is composed of polymer I, which is polyethylene, polyvinylidene fluoride, polyacrylonitrile, polyurethane, or polyvinyl butyral, and solvent I, which is dimethylformamide, dimethylacetamide, dichloromethane, 1H,6H-perfluorohexane, n-pentane, or cyclopentane, at a concentration of 2 to 40 wt %.

[0009] In the method for producing composite ultrafine nanofibers by flash electrospinning, the electrospinning solution also contains a water repellent agent of silicone type, C6 telomer (perfluorohexyl type) or C8 telomer (perfluoroalkyl type) at a concentration of 0.5-5 wt%. Adding a water repellent agent to the electrospinning solution gives the nanofibers superhydrophobicity, and the contact angle with water is greater than 150°. The composite ultrafine nanofibers obtained by flash electrospinning have improved hydrophobicity and higher water pressure resistance. In fact, it is possible to add a water repellent agent to the flash spinning solution, but since the flash spun fibers are micron-sized and the gaps formed by the filaments arranged side by side are somewhat large, the water pressure resistance does not increase much even if a water repellent agent is added. However, the electrospun fibers are nano-sized, and the filament gaps are greatly reduced. Since the narrow filament gaps and superhydrophobicity can significantly improve the water pressure resistance, it is preferable to add a water repellent agent only to the electrospinning solution in the present invention.

[0010] In the manufacturing method of composite ultrafine nanofibers by flash electrospinning, the electrospinning conditions are a liquid supply rate of 1 to 10 mL / min, a spinning voltage of 30 to 100 kV, an environmental temperature of 23 to 25°C, and an environmental relative humidity of 20 to 90%, and the electrospinning process involves transporting the spinning solution to a nozzle using an infusion pump and turning it into nanofibers by applying a high voltage to the nozzle.

[0011] In the method for producing composite ultrafine nanofibers by flash electrospinning, the flash spinning solution is composed of polymer II, which is polyethylene having a melt flow rate of 0.7 g / 10 min and a melting point of 133° C., measured under a temperature of 160° C. and a load of 5 kg, and solvent II, which is dichloromethane, 1H,6H-perfluorohexane, n-pentane, or cyclopentane, at a concentration of 2 to 35 wt %.

[0012] In the manufacturing method of composite ultrafine nanofibers by flash electrospinning, the flash spinning conditions are a pressure of 8-30MPa, a temperature of 150-300℃, and a stirring speed of 500-1500rpm. In the flash spinning process, polymer II and solvent II are transported to a high pressure boiler by an automatic feeder, the inside of the boiler is pressurized to 8-30MPa and heated to 150-300℃. After the set conditions are reached, the pressure relief valve is opened to instantly release the pressure, and the solution passes through the pressure reduction chamber and is sprayed from a nozzle to become micron fibers.

[0013] In the method for producing composite ultrafine nanofibers by flash electrostatic spinning, during electrostatic spinning, a random airflow is blown onto a jet discharged from an electrostatic spinning nozzle, and during flash spinning, a random airflow is blown onto a jet discharged from a flash spinning nozzle.

[0014] In the method for producing composite ultrafine nanofibers by flash electrospinning, the environmental solvent concentration may be controlled during electrospinning so that the solvent concentration in the environment is gradually increased along the direction of the jet flow, thereby compensating for a decrease in the solvent concentration at a location farther from the nozzle.

[0015] In the manufacturing method of composite ultrafine nanofibers by flash electrospinning, after the electrostatic and flash spinning processes, the entangled nanofibers and micron fibers may be hot pressed. The hot pressing temperature is set between the melting points of the nanofibers and the micron fibers, and the hot pressing time is 0.2-0.7 minutes. The hot pressing aims to create strong adhesion between the fibers, but considering both fiber embrittlement and processing effect, the hot pressing time should not be too long or too short.

[0016] The present invention also provides a fiber material produced by the method for producing composite ultrafine nanofibers by flash electrospinning, which has a sheet structure of nanofibers and micron fibers, in which the micron fibers are entangled and interpenetrate with each other, the nanofibers are distributed among the micron fibers, some of the nanofibers are entangled and interpenetrate with the micron fibers, and the nanofibers, the micron fibers, and the nanofibers and the micron fibers are bonded to each other, to each other, and to each other, and the mass ratio of the nanofibers to the micron fibers is 1:5 to 2:5.

[0017] Preferably, the composite ultrafine nanofiber material by flash electrospinning contains nanofibers with an average diameter of 50-800 nm, micron fibers with an average diameter of 1-20 μm, strength (measured according to GB / T328.9-2007) of >100 N / 50 mm, porosity of >55%, and moisture permeability (measured according to GB / T17146) of >800 g / m 2 -24h water pressure resistance (measured according to GB / T4744-2013) >5kPa.

[0018] The present invention further provides an intensive flash-electrostatic composite spinning system, comprising a flash spinning section, an electrostatic spinning section and a grounded collecting conveyor belt. The flash spinning section includes a flash injection unit including a grounded nozzle (hereinafter referred to as the first nozzle), while the electrostatic spinning section includes a high-voltage power supply and an electrostatic injection unit including a nozzle (hereinafter referred to as the second nozzle) connected to the high-voltage power supply. The first and second nozzles are positioned on the collection conveyor belt facing each other with a distance D of 15 to 40 cm between them. If the nozzle distance D is too narrow, the strong flash air current will blow away the electrostatically discharged nanofilaments, and if it is too wide, the flash-discharged micron fibers and electrostatically discharged nanofibers will not be able to be entangled well.

[0019] Preferably, the intensive flash electrostatic composite spinning equipment further comprises: The flash spinning section includes a first spraying device, and the electrostatic spinning section includes a second spraying device. The first spraying device randomly sprays the flash-discharged micron fibers, which results in more entangled structures in the resulting fiber material, and the fibers have a stronger cohesive force after hot pressing, which increases the strength of the fiber material. Similarly, the second spraying device randomly sprays the electrostatically discharged nano fibers, which results in entanglement between the nano fibers and between the nano fibers and the micro fibers. Both the first blowing device and the second blowing device include an air supply device, an inner cylinder, an outer cylinder, a standing plate I and a standing plate II, and further, the outer cylinder is fitted onto the inner cylinder so that it is coaxial with the inner cylinder and both ends are flush with each other, one end of the outer cylinder and the inner cylinder are simultaneously sealed by standing plate I and the other end is connected by standing plate II, the inner cylinder, the outer cylinder, the standing plate I and the standing plate II together form a sealed chamber, the outer cylinder is provided with an air flow introduction hole that connects to the air supply device via an air tube, and the inner cylinder has multiple jet holes randomly distributed therein. The distance between the vertical plate II of the first spray device and the vertical plate II of the second spray device is X, which is greater than 0. Separately, the stand plate I of the first blowing device is fitted onto the outside of the first nozzle, and the stand plate I of the second blowing device is fitted onto the outside of the second nozzle. Therefore, the jet discharged from the nozzle is ejected into the inner cylinder, and further, the random air flow introduced into the inner cylinder changes the direction of the yarn consisting of the jet, so that the jet ejection is also random.

[0020] In the intensive flash electrostatic composite spinning equipment, the outer diameter of the inner cylinder is 0.5-3 m, the inner diameter of the outer cylinder is 0.3-2.7 m, the wall thickness of the inner cylinder or the outer cylinder is 0.1-0.3 m, the air supply device provides an air flow with a pressure of 2-30 MPa, the hole diameter of the jet hole is 0.4-1 mm, and the number of jet holes is 500-300.

[0021] In the intensive flash electrostatic composite spinning equipment, the inner cylinder of the first spraying device and the inner cylinder of the second spraying device are coaxial, the distance between the stand II of the first spraying device and the first nozzle I is equal to the distance between the stand II of the second spraying device and the second nozzle, and X is 30% to 60% of D.

[0022] In the enhanced flash electrostatic composite spinning equipment, the electrostatic spinning section also provides a solvent atomization generator for atomizing the liquid solvent, while the second spraying device also includes a plurality of partition plates parallel to the vertical plate I, which divide the sealed chamber into a plurality of sub-sealing chambers, and the outer cylinder also has a plurality of airflow inlet holes, each sub-sealing chamber is connected to at least one airflow inlet hole, and a flow controller is installed on the airflow inlet holes to increase the airflow rate of each airflow inlet hole according to the direction of the jet flow, and the air pipes connected to the airflow inlet holes of each sub-sealing chamber are also connected to the solvent atomization generator. The present invention achieves the purpose of controlling the solvent concentration in the spinning environment by controlling the airflow rate to release different amounts of solvent, that is, the environmental solvent concentration is gradually increased according to the direction of the jet flow. Therefore, the volatilization of the solvent in the electrostatic spinning solution is slowed down, and the nanofibers have a certain degree of adhesive force and can form an entangled structure when they come into contact with the micron fibers coming from the flash spinning, and the adhesive strength between the fibers after hot pressing is greatly improved.

[0023] In the intensive flash electrostatic composite spinning equipment, the flash spinning section also includes a polymer hopper, a solvent hopper and a high-temperature and high-pressure boiler, and the polymer hopper, the solvent hopper and the flash injection unit are simultaneously connected to the high-temperature and high-pressure boiler.

[0024] In the intensive flash electrostatic composite spinning equipment, the electrostatic spinning section also includes a spinning solution hopper connected to the electrostatic injection unit.

[0025] In the intensive flash electrostatic composite spinning equipment, the distance between the first or second nozzle and the collecting conveyor belt is 10 to 60 cm. If the distance is too narrow, the collected fibers are easily affected by the jet, and the entanglement of the nanofibers and the micron fibers becomes insufficient, the randomness of the entanglement structure decreases, and the strength of the obtained sheet decreases. If the distance is too wide, the production efficiency decreases.

[0026] The intensive flash electrostatic composite spinning equipment further includes an upper hot press roll and a lower hot press roll located above and below the collecting conveyor belt.

[0027] The principles of the invention are as follows:

[0028] The present invention controls the facing position of the electrostatic nozzle and the flash nozzle when forming micron fibers by flash spinning while making nanon fibers by electrostatic spinning. In this case, the solvent evaporates quickly due to the instantaneous release of pressure during flash, and the micron fibers dry quickly. Furthermore, since the polymer material of the fibers is non-conductive, the micron fibers become charged when they are exposed to the electrostatic field from the other side, and each filament repels each other. In other words, the micron fibers formed by flash spinning are entangled, wound, interpenetrated, etc. under the electrostatic force of electrostatic spinning, while the nanon fibers are distributed among the micron fibers, and some of the nanon fibers are entangled with the micron fibers and interpenetrate each other, so that a composite ultrafine nanofiber material can be formed by flash electrostatic spinning.

[0029] On the other hand, the fiber material of the present invention has a significantly increased number of effective entanglements (20-50% increase) compared to fiber materials prepared only by flash spinning, so that not only can the flash spun micron fibers be strongly bonded to each other after hot pressing, but also the electrospun nanofibers and micron fibers can form a complex network entanglement structure with each other, thereby greatly improving the strength of the composite fiber sheet of the present invention.

[0030] On the other hand, the composite ultrafine nanofiber material by flash electrospinning of the present invention has a significantly more complex entangled structure than conventional flash spun micron fiber materials, i.e., both horizontal and vertical entanglements (relative to the planar direction of the fiber sheet) are increased. The greater the number of horizontal entanglements, the greater the sheet strength, and the greater the number of vertical entanglements, the stronger the mutual embracing force between the fiber layers. Therefore, the present invention solves the problem of easy delamination of the flash spun fiber materials of the prior art.

[0031] On the other hand, the composite ultrafine nanofiber material by flash electrospinning of the present invention has a certain amount of nanofibers, and moreover, nanofibers containing water repellent are increased compared to conventional flash spun micron fiber materials. The improved hydrophobicity of nanofibers and the narrow gaps of nanofibers are both favorable for improving water pressure resistance. At the same time, the number of intertwining of fibers increases, increasing the void ratio of the sheet, and the moisture permeability also increases. Therefore, the composite ultrafine nanofiber material by flash electrospinning of the present invention has excellent waterproofness and gas permeability, solving the problems of conventional flash spun micron fiber materials. Effect of the Invention

[0032] Advantages of the present invention include: (1) The composite ultrafine nanofiber material provided by the present invention, which is produced by flash electrospinning, has significantly improved strength, excellent water pressure resistance and moisture permeability, and can be used in a wide range of applications, such as packaging and construction. (2) The manufacturing method of the composite ultrafine nanofiber material by flash electrospinning provided by the present invention enhances the intertwining structure and entanglement of the fibers, increases the hydrophobicity and porosity of the fibers, and significantly improves the usability of the material. [Brief description of the drawings]

[0033] [Figure 1] 1 is a schematic diagram of the structure of an enhanced flash electrostatic composite spinning equipment according to the present invention. FIG. [Diagram 2]FIG. 1 is an exploded view of the inner cylinder of the first spraying device in Example 1, in which A represents the connection end of the inner cylinder and the stand I, and B represents the connection end of the inner cylinder and the stand II. Furthermore, each number indicates the following: 1-polymer hopper, 2-solvent hopper, 3-high temperature and high pressure kettle, 4-first spraying device, 5-flash injection unit, 6-electrostatic injection unit, 7-electrostatic spinning solution hopper, 8-high voltage power supply, 9-collection conveyor belt, 10-upper hot press roll, 11-lower hot press roll, 12-second spraying device, 13-solvent atomization generator, 14-ground wire. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0034] The present invention will be described in more detail below with reference to examples, but the present invention is not limited to the following examples as long as it does not exceed the gist of the present invention. Even if various modifications of the present invention are permitted by a person skilled in the art who has read the contents of the present invention, they are also limited within the scope of the claims of the present invention as equivalent forms of the present invention.

[0035] The specific manufacturing method of the composite ultrafine nanofiber material by flash electrospinning is as follows. When producing nanofibers by electrostatic spinning and forming micron fibers by flash spinning, an electrostatic nozzle and a flash nozzle are placed facing each other at a distance of 15~40cm on the collecting conveyor belt, and at the same time, the electrostatic nozzle is connected to a high voltage power source, and the flash nozzle and the collecting conveyor belt are grounded, thereby producing ultra-fine nanofibers by flash-electrostatic composite spinning. The electrospinning solution is composed of a polymer I, which is polyethylene, polyvinylidene fluoride, polyacrylonitrile, polyurethane or polyvinyl butyral, and a solvent I, which is dimethylformamide, dimethylacetamide, dichloromethane, 1H,6H-perfluorohexane, n-pentane or cyclopentane, at a concentration of 2-40 wt%. Preferably, the electrospinning solution also contains a silicone-based, C6 telomer (perfluorohexyl-based) or C8 telomer (perfluoroalkyl-based) water repellent at a concentration of 0.5-5 wt%. The electrostatic spinning conditions are a liquid supply rate of 1 to 10 mL / min, a spinning voltage of 30 to 100 kV, an environmental temperature of 23 to 25° C., and an environmental relative humidity of 20 to 90%. The flash spinning solution is composed of polymer II, which is polyethylene having a melting point of 133°C and a melt flow rate of 0.7 g / 10 min measured at a temperature of 160°C under a load of 5 kg, and solvent II, which is dichloromethane, 1H,6H-perfluorohexane, n-pentane, or cyclopentane, at a concentration of 2 to 35 wt%. The conditions for flash spinning are a pressure of 8 to 30 MPa, a temperature of 150 to 300° C., and a stirring speed of 500 to 1500 rpm. Preferably, during electrostatic spinning, a random airflow is blown onto a jet discharged from an electrostatic spinning nozzle, and during flash spinning, a random airflow is blown onto a jet discharged from a flash spinning nozzle. Preferably, during electrospinning, the environmental solvent concentration is controlled so that the solvent concentration in the environment is gradually increased along the direction of the jet flow. Preferably, after the electrostatic and flash spinning processes, the entangled nanofibers and micron fibers are hot pressed, the temperature of the hot press being set between the melting points of the nanofibers and the micron fibers, and the time being 0.2 to 0.7 minutes. Finally, the composite ultrafine nanofiber material obtained by flash electrospinning has a sheet structure composed of nanofibers and micron fibers, in which the micron fibers are entangled and interpenetrated with each other, the nanofibers are distributed among the micron fibers, and some of the nanofibers are entangled and interpenetrated with the micron fibers, whereby adhesion occurs between the nanofibers, between the micron fibers, and between the nanofibers and the micron fibers. The mass ratio of the nanofibers to the micron fibers is 1:5-2:5, the average diameter of the nanofibers is 50-800nm, the average diameter of the micron fibers is 1-20μm, and the strength of the fiber sheet is >100N / 50mm, the porosity is >55%, and the moisture permeability is >800g / m 2 24h water pressure resistance > 5kPa.

[0036] The preparation of the composite ultrafine nanofiber material by flash electrospinning can be achieved by various equipment, and the specific form adopted is not limited, but as long as it is the same as the above preparation method, it is also limited within the scope of the claims of the present invention. One of them will be described as an example below.

[0037] The enhanced flash-electrostatic composite spinning equipment includes a flash spinning section, an electrostatic spinning section and a grounded 9-gathering conveyor belt, as shown in Figure 1. The flash spinning section includes a 5-flash injection unit, a 1-polymer hopper, a 2-solvent hopper and a 3-high temperature and high pressure boiler, further, the 1-polymer hopper, the 2-solvent hopper and the 5-flash injection unit are simultaneously connected to the 3-high temperature and high pressure boiler, and the 5-flash injection unit also includes a first nozzle grounded. The electrostatic spinning section includes an 8-high voltage power supply, a 6-electrostatic injection unit, and a 7-spinning solution hopper connected to the 6-electrostatic injection unit, and the 6-electrostatic injection unit also includes a second nozzle connected to the 8-high voltage power supply. The first nozzle and the second nozzle are positioned on the 9-collection conveyor belt, facing each other with a distance D of 15 to 40 cm. The distance between the first nozzle or the second nozzle and the 9-collection conveyor belt is 10 to 60 cm. Preferably, the flash spinning unit includes a 4-first blowing device, and the electrostatic spinning unit includes a 12-second blowing device, and the 4-first blowing device and the 12-second blowing device each include an air supply device, an inner cylinder, an outer cylinder, a standing plate I and a standing plate II. Furthermore, the outer cylinder is fitted onto the inner cylinder so that it is coaxial with the inner cylinder and both ends are flush with each other. One end of the outer cylinder and the inner cylinder are simultaneously sealed by the standing plate I, and the other end is connected by the standing plate II. The inner cylinder, the outer cylinder, the standing plate I and the standing plate II together form a sealed chamber, and the outer cylinder is supplied with air through a trachea. An airflow inlet hole connecting the device is provided, and a plurality of jet holes are randomly distributed in the inner cylinder, the distance between the stand II of the 4-first spraying device and the stand II of the 12-second spraying device is X greater than 0, the stand I of the 4-first spraying device is fitted onto the outside of the first nozzle so that the jet discharged from the first nozzle is injected into the inner cylinder of the 4-first spraying device, and the stand I of the 12-second spraying device is fitted onto the outside of the second nozzle so that the jet discharged from the second nozzle is injected into the inner cylinder of the 12-second spraying device. More preferably, the outer diameter of the inner cylinder is 0.5-3 m, the inner diameter of the outer cylinder is 0.3-2.7 m, the wall thickness of the inner cylinder or the outer cylinder is 0.1-0.3 m, the air supply device provides an air flow with a pressure of 2-30 MPa, the jet hole diameter is 0.4-1 mm, and the number of jet holes is 500-300. More preferably, the inner cylinder of the 4-first spraying device and the inner cylinder of the 12-second spraying device are coaxial, the distance between the stand II and the nozzle I of the 4-first spraying device is equal to the distance between the stand II and the second nozzle of the 12-second spraying device, and X is 30% to 60% of D. Preferably, the electrostatic spinning unit also includes a solvent atomization generator 13 for atomizing the liquid solvent, while the second spraying device 12 also includes a plurality of partition plates parallel to the vertical plate I for dividing the sealed chamber into a plurality of sub-sealed chambers, and the outer cylinder also has a plurality of airflow inlet holes, each sub-sealed chamber is connected to at least one airflow inlet hole, and a flow controller is installed on the airflow inlet holes so that the airflow rate of each airflow inlet hole increases according to the direction of the jet, and the air pipes connected to the airflow inlet holes of each sub-sealed chamber are also connected to the solvent atomization generator 13. Preferably, it further includes an upper hot press roll and a lower hot press roll located on both the upper and lower sides of the 9-collecting conveyor belt.

[0038] The enhanced flash electrostatic composite spinning equipment and the process for producing a composite ultrafine nanofiber material by flash electrostatic spinning using the equipment will be described in more detail below with reference to examples.

[0039] Example 1 As shown in Figure 1, the enhanced flash-electrostatic composite spinning equipment includes a flash spinning section, an electrostatic spinning section, a collecting conveyor belt 9 connected to a ground wire, and an upper hot press roll 10 and a lower hot press roll 11 located on both the upper and lower sides of the collecting conveyor belt 9. The flash spinning section includes: 5-flash injection unit, 4-first blowing device, 1-polymer hopper, 2-solvent hopper and 3-high temperature autoclave; further, the 1-polymer hopper, 2-solvent hopper and 5-flash injection unit are simultaneously connected to the 3-high temperature autoclave. The 5-flash injection unit includes a first nozzle that connects to a 14-ground wire. The electrostatic spinning section includes: 8-high voltage power supply; 12-second spray device; 6-electrostatic injection unit; 13-solvent atomization generator for atomizing liquid solvent; and 7-spinning solution hopper connecting with 6-electrostatic injection unit. 6-The electrostatic ejection unit also includes a second nozzle that connects to a 8-high voltage power supply. The first nozzle and the second nozzle are positioned on the 9-collection conveyor belt, facing each other with a distance D of 15 cm. The distance between the first nozzle and the 9-collection conveyor belt is 10 cm, and the distance between the second nozzle and the 9-collection conveyor belt is 10 cm. 4-The first blowing device includes an air supply device, an inner tube, an outer tube, a vertical plate I and a vertical plate II, and the outer tube is fitted onto the inner tube so that it is coaxial with the inner tube and both ends are flush with each other. One end of the outer tube and the inner tube are simultaneously sealed by vertical plate I, and the other end is connected by vertical plate II. The inner tube, the outer tube, the vertical plate I and the vertical plate II together form a sealed chamber. The outer tube is provided with an airflow inlet hole that connects to the air supply device via an air tube. As shown in Figure 2 (which is only a schematic and does not completely show all the jet holes), the diameter of the 300 jet holes randomly distributed on the inner tube is 0.4 mm. In the first blowing device, the outer diameter of the inner cylinder is 0.5 m, the inner diameter of the outer cylinder is 0.3 m, the wall thickness of the inner cylinder is 0.1 m, and the wall thickness of the outer cylinder is 0.13 m, and the air supply device provides an air flow with a pressure of 2 MPa. The vertical plate I of the 4-first spray device is fitted onto the outside of the first nozzle, and the jet discharged from the first nozzle is injected into the inner cylinder of the 4-first spray device. 12-The second blowing device includes four partition plates, an air supply device, an inner cylinder, an outer cylinder, a vertical plate I and a vertical plate II. Furthermore, the outer cylinder is fitted onto the inner cylinder so that it is coaxial with the inner cylinder and both ends are flush with each other. One end of the outer cylinder and the inner cylinder are simultaneously sealed by the vertical plate I, and the other end is connected by the vertical plate II. The inner cylinder, the outer cylinder, the vertical plate I and the vertical plate II together form a sealed chamber, and the partition plates divide the sealed chamber into five sub-sealed chambers parallel to the vertical plate I, and the outer cylinder The inner cylinder is equipped with five airflow inlet holes, which are connected to each sub-sealing chamber separately. In addition, a flow controller is installed on the airflow inlet holes so that the airflow rate of each airflow inlet hole increases according to the direction of the jet flow. The air pipes connected to the airflow inlet holes of each sub-sealing chamber are also connected to the 13-solvent atomization generator (i.e., the air pipes are connected to the air supply device and the solvent atomization generator at the same time). The diameter of the 300 jet holes randomly distributed on the inner cylinder is 0.4 mm. In the second blowing device, the outer diameter of the inner cylinder is 0.5 m, the inner diameter of the outer cylinder is 0.3 m, the wall thickness of the inner cylinder is 0.1 m, the wall thickness of the outer cylinder is 0.1 m, and the air supply device provides an air flow with a pressure of 2 MPa. The vertical plate I of the second spray device 12 is fitted onto the outside of the second nozzle, and the jet discharged from the second nozzle is injected into the inner cylinder of the second spray device 12. The inner cylinder of the 4-first spraying device and the inner cylinder of the 12-second spraying device are coaxial, the distance between the stand II of the 4-first spraying device and the first nozzle is equal to the distance between the stand II of the 12-second spraying device and the second nozzle, and X is 30% of D. The manufacturing method of composite ultrafine nanofiber material by flash electrostatic spinning is carried out by adopting the above-mentioned enhanced flash electrostatic composite spinning equipment. Before starting the equipment, prepare the following: Inject an electrospinning solution into the electrospinning solution hopper, the solution containing polyethylene, a silicone-based water repellent (SEAL80, AkzoNobel), and dimethylformamide, the polyethylene concentration being 2 wt%, and the silicone-based water repellent concentration being 0.5 wt%; Set up electrostatic spinning conditions as follows: feeding rate is 1 mL / min, spinning voltage is 30 kV, environmental temperature is 23 °C, and environmental relative humidity is 90%; Inject dimethylformamide into the solvent mist generator; Depending on the direction of the jet, the airflow rate of the airflow inlet of each sub-sealed chamber is 10m apart. 3 / h, 18m 3 / h, 32m 3 / h, 36m 3 / h, 40m 3 / h; After the equipment is started, add a certain amount of polyethylene, which has a melting point of 133°C and a melt flow rate of 0.7g / 10min measured under a temperature of 160°C and a load of 5kg, to the polymer hopper, and add a certain amount of dichloromethane to the solvent hopper, so as to form a flash spinning solution with a concentration of 2wt% in the high-temperature and high-pressure kettle; Set up flash spinning conditions: pressure 8 MPa, temperature 300°C, stirring speed 500 rpm; The upper hot press roll and the lower hot press roll are controlled to hot press the sheet formed of nanofibers and micron fibers at a temperature of 100° C. for a time of 0.2 min. After completing the above preparations, start up the equipment to produce composite ultrafine nanofiber materials by flash electrospinning. The obtained fiber material exhibited a sheet structure composed of nanofibers with an average diameter of 80 nm and micron fibers with an average diameter of 1.2 μm, in which the micron fibers were entangled and penetrated each other, the nanofibers were distributed among the micron fibers, and some of the nanofibers were entangled and penetrated each other with the micron fibers. Adhesion occurred between the nanofibers, between the micron fibers, and between the nanofibers and the micron fibers. The mass ratio of the nanofibers to the micron fibers was 11:50, and the strength was 450 N / 50 mm, the porosity was 83%, and the moisture permeability was 1600 g / m 2 -24h, water resistance is 45kPa.

[0040] Example 2 The enhanced flash-electrostatic composite spinning equipment includes a flash spinning section, an electrostatic spinning section, a grounded collecting conveyor belt, and upper and lower hot press rolls located above and below the collecting conveyor belt. The flash spinning section includes a flash injection unit, a first spray device, a polymer hopper, a solvent hopper and a high-temperature and high-pressure kettle, and the polymer hopper, the solvent hopper and the flash injection unit are simultaneously connected to the high-temperature and high-pressure kettle. The flash ejection unit includes a first nozzle connected to the ground. The electrostatic spinning section includes a high voltage power supply, a second spray device, an electrostatic injection unit, a solvent atomization generator for atomizing the liquid solvent, and a spinning solution hopper connected to the electrostatic injection unit. The electrostatic ejection unit also includes a second nozzle that connects to a high voltage power supply. The first nozzle and the second nozzle are positioned on the collecting conveyor belt facing each other with a distance D of 18 cm between them. The distance between the first nozzle and the collecting conveyor belt is 20 cm, and the distance between the second nozzle and the collecting conveyor belt is 20 cm. The first blowing device comprises an air supply device, an inner cylinder, an outer cylinder, a standing plate I and a standing plate II. Furthermore, the outer cylinder is fitted onto the inner cylinder so that it is coaxial with the inner cylinder and both ends are flush with each other. One end of the outer cylinder and the inner cylinder are simultaneously sealed by standing plate I, and the other end is connected by standing plate II. The inner cylinder, the outer cylinder, the standing plate I and the standing plate II together form a sealed chamber. The outer cylinder is provided with an air flow inlet hole that connects to the air supply device via an air tube, and the diameter of the 350 jet holes randomly distributed on the inner cylinder is 0.5 mm. In the first blowing device, the outer diameter of the inner cylinder is 1 m, the inner diameter of the outer cylinder is 0.7 m, the wall thickness of the inner cylinder is 0.15 m, and the wall thickness of the outer cylinder is 0.18 m, and the air supply device provides an air flow with a pressure of 5 MPa. The upright plate I of the first spray device is fitted onto the outside of the first nozzle, and the jet discharged from the first nozzle is injected into the inner cylinder of the first spray device 4-. The second blowing device includes four partition plates, an air supply device, an inner cylinder, an outer cylinder, a vertical plate I, and a vertical plate II. Furthermore, the outer cylinder is fitted onto the inner cylinder so that it is coaxial with the inner cylinder and both ends are flush with each other. One end of the outer cylinder and the inner cylinder are simultaneously sealed by the vertical plate I, and the other end is connected by the vertical plate II. The inner cylinder, the outer cylinder, the vertical plate I, and the vertical plate II together form a sealed chamber, and the partition plates divide the sealed chamber into five sub-sealed chambers parallel to the vertical plate I. The outer cylinder has Five airflow inlet holes are installed and connected to each sub-sealing chamber separately. Furthermore, a flow controller is installed on the airflow inlet holes so that the airflow rate of each airflow inlet hole increases according to the direction of the jet flow. The air pipes connected to the airflow inlet holes of each sub-sealing chamber are also connected to the 13-solvent atomization generator (i.e., the air pipes are connected to the air supply device and the solvent atomization generator at the same time). The diameter of the 380 jet holes randomly distributed on the inner cylinder is 0.52 mm. In the second blowing device, the outer diameter of the inner cylinder is 1 m, the inner diameter of the outer cylinder is 0.8 m, the wall thickness of the inner cylinder is 0.12 m, the wall thickness of the outer cylinder is 0.12 m, and the air supply device provides an air flow with a pressure of 7.8 MPa. The standing plate I of the second spray device is fitted onto the outside of the second nozzle, and the jet discharged from the second nozzle is injected into the inner cylinder of the second spray device. The inner cylinder of the first spraying device and the inner cylinder of the second spraying device are coaxial, the distance between the stand II and the nozzle I of the first spraying device is equal to the distance between the stand II and the second nozzle of the second spraying device, and X is 38% of D. The manufacturing method of composite ultrafine nanofiber material by flash electrostatic spinning is carried out by adopting the above-mentioned enhanced flash electrostatic composite spinning equipment. Before starting the equipment, prepare the following: Inject an electrospinning solution into the electrospinning solution hopper, the solution containing polyvinylidene fluoride, C6 telomer (Z-2001, Kajitsu Co., Ltd.) and dimethylacetamide, in which the polyvinylidene fluoride concentration is 4 wt% and the C6 telomer concentration is 1 wt%; Set up electrostatic spinning conditions as follows: feed rate is 2 mL / min, spinning voltage is 40 kV, environmental temperature is 23 °C, and environmental relative humidity is 80%; Inject dimethylacetamide into the solvent atomization generator; Depending on the direction of the jet, the airflow rate of the airflow inlet of each sub-sealed chamber is 12m 3 / h, 20m 3 / h, 34m 3 / h, 38m 3 / h, 44m 3 / h; After the equipment is started, add a certain amount of polyethylene, which has a melting point of 133°C and a melt flow rate of 0.7g / 10min measured under a temperature of 160°C and a load of 5kg, to the polymer hopper, and add a certain amount of 1H,6H-perfluorohexane to the solvent hopper, so as to form a flash spinning solution with a concentration of 6wt% in the high-temperature autoclave; Set up flash spinning conditions: pressure 13 MPa, temperature 270 °C, stirring speed 700 rpm; The upper hot press roll and the lower hot press roll are controlled to hot press the sheet formed with nanofibers and micron fibers at a temperature of 130° C. for 0.3 min. After completing the above preparations, start up the equipment to produce composite ultrafine nanofiber materials by flash electrospinning. The obtained fiber material exhibits a sheet structure composed of nanofibers with an average diameter of 150 nm and micron fibers with an average diameter of 3 μm, in which the micron fibers are entangled and penetrate each other, the nanofibers are distributed among the micron fibers, and some of the nanofibers are entangled and penetrate each other with the micron fibers. Adhesion occurs between the nanofibers, between the micron fibers, and between the nanofibers and the micron fibers. The mass ratio of the nanofibers to the micron fibers is 1:4, and the strength is 480 N / 50 mm, the porosity is 85%, and the moisture permeability is 1980 g / m 2 -24h, water resistance is 5kPa.

[0041] Example 3 The enhanced flash-electrostatic composite spinning equipment includes a flash spinning section, an electrostatic spinning section, a grounded collecting conveyor belt, and upper and lower hot press rolls located above and below the collecting conveyor belt. The flash spinning section includes a flash injection unit, a first spray device, a polymer hopper, a solvent hopper and a high-temperature and high-pressure kettle, and the polymer hopper, the solvent hopper and the flash injection unit are simultaneously connected to the high-temperature and high-pressure kettle. The flash ejection unit includes a first nozzle connected to the ground. The electrostatic spinning section includes a high voltage power supply, a second spray device, an electrostatic injection unit, a solvent atomization generator for atomizing the liquid solvent, and a spinning solution hopper connected to the electrostatic injection unit. The electrostatic ejection unit also includes a second nozzle that connects to a high voltage power supply. The first nozzle and the second nozzle are positioned on the collecting conveyor belt facing each other with a distance D of 22 cm between them. The distance between the first nozzle and the collecting conveyor belt is 30 cm, and the distance between the second nozzle and the collecting conveyor belt is 30 cm. The first blowing device includes an air supply device, an inner cylinder, an outer cylinder, a standing plate I and a standing plate II. Furthermore, the outer cylinder is fitted onto the inner cylinder so that it is coaxial with the inner cylinder and both ends are flush with each other. One end of the outer cylinder and the inner cylinder are simultaneously sealed by standing plate I, and the other end is connected by standing plate II. The inner cylinder, the outer cylinder, the standing plate I and the standing plate II together form a sealed chamber. The outer cylinder is provided with an air flow inlet hole that connects to the air supply device via an air tube, and the diameter of the 400 jet holes randomly distributed on the inner cylinder is 0.6 mm. In the first blowing device, the outer diameter of the inner cylinder is 1.5 m, the inner diameter of the outer cylinder is 1.2 m, the wall thickness of the inner cylinder is 0.2 m, and the wall thickness of the outer cylinder is 0.2 m, and the air supply device provides an air flow with a pressure of 10 MPa. The upright plate I of the first spray device is fitted onto the outside of the first nozzle, so that the jet discharged from the first nozzle is injected into the inner cylinder of the first spray device. The second blowing device includes five partition plates, an air supply device, an inner cylinder, an outer cylinder, a vertical plate I, and a vertical plate II. Furthermore, the outer cylinder is fitted onto the inner cylinder so that it is coaxial with the inner cylinder and both ends are flush with each other. One end of the outer cylinder and the inner cylinder are simultaneously sealed by the vertical plate I, and the other end is connected by the vertical plate II. The inner cylinder, the outer cylinder, the vertical plate I, and the vertical plate II together form a sealed chamber, and the partition plates divide the sealed chamber into six sub-sealed chambers parallel to the vertical plate I. The outer cylinder has Five airflow inlet holes are installed and connected to each sub-sealing chamber separately. Furthermore, in order to increase the airflow rate of each airflow inlet hole according to the direction of the jet flow, a flow controller is installed on the airflow inlet holes. The air pipes connected to the airflow inlet holes of each sub-sealing chamber are also connected to the 13-solvent atomization generator (i.e., the air pipes are connected to the air supply device and the solvent atomization generator at the same time). The diameter of the 410 jet holes randomly distributed on the inner cylinder is 0.63 mm. In the second blowing device, the outer diameter of the inner cylinder is 1.5 m, the inner diameter of the outer cylinder is 1.4 m, the wall thickness of the inner cylinder is 0.18 m, the wall thickness of the outer cylinder is 0.18 m, and the air supply device provides an air flow with a pressure of 12.9 MPa. The standing plate I of the second spray device is fitted onto the outside of the second nozzle, and the jet discharged from the second nozzle is injected into the inner cylinder of the second spray device. The inner cylinder of the first spraying device and the inner cylinder of the second spraying device are coaxial, the distance between the stand II and the nozzle I of the first spraying device is equal to the distance between the stand II and the second nozzle of the second spraying device, and X is 46% of D. The manufacturing method of composite ultrafine nanofiber material by flash electrostatic spinning is carried out by adopting the above-mentioned enhanced flash electrostatic composite spinning equipment. Before starting the equipment, prepare the following: Inject an electrospinning solution into the electrospinning solution hopper, the electrospinning solution containing polyacrylonitrile, C8 telomer (5003F, Daikin) and dichloromethane, and the polyacrylonitrile concentration is 10 wt% and the C8 telomer concentration is 3 wt%; The electrostatic spinning conditions are set up as follows: the feed rate is 4 mL / min, the spinning voltage is 50 kV, the environmental temperature is 24 °C, and the environmental relative humidity is 70%; Inject dichloromethane into the solvent atomization generator; Depending on the direction of the jet, the airflow rate of the airflow inlet of each sub-sealed chamber is 10m apart. 3 / h, 18m 3 / h, 32m 3 / h, 36m 3 / h, 40m 3 / h, 46m 3 / h; After the equipment is started, add a certain amount of polyethylene, which has a melting point of 133°C and a melt flow rate of 0.7g / 10min measured under a temperature of 160°C and a load of 5kg, to the polymer hopper, and add a certain amount of n-pentane to the solvent hopper, so as to form a flash spinning solution with a concentration of 10wt% in the high-temperature autoclave; Set up flash spinning conditions: pressure 16 MPa, temperature 230°C, stirring speed 900 rpm; The upper hot press roll and the lower hot press roll are controlled to hot press the sheet formed with nanofibers and micron fibers at a temperature of 180° C. for a time of 0.4 min. After completing the above preparations, start up the equipment to produce composite ultrafine nanofiber materials by flash electrospinning. The obtained fiber material has a sheet structure composed of nanofibers with an average diameter of 230 nm and micron fibers with an average diameter of 6 μm, in which the micron fibers are entangled and penetrate each other, the nanofibers are distributed among the micron fibers, and some of the nanofibers are entangled and penetrate each other, and adhesion occurs between the nanofibers, between the micron fibers, and between the nanofibers and the micron fibers. The mass ratio of the nanofibers to the micron fibers is 3:10, and the strength is 500 N / 50 mm, the porosity is 88%, and the moisture permeability is 2500 g / m 2 -24h, water resistance is 36kPa.

[0042] Example 4 The enhanced flash-electrostatic composite spinning equipment includes a flash spinning section, an electrostatic spinning section, a grounded collecting conveyor belt, and upper and lower hot press rolls located above and below the collecting conveyor belt. The flash spinning section includes a flash injection unit, a first spray device, a polymer hopper, a solvent hopper and a high-temperature and high-pressure kettle, and the polymer hopper, the solvent hopper and the flash injection unit are simultaneously connected to the high-temperature and high-pressure kettle. The flash ejection unit includes a first nozzle connected to the ground. The electrostatic spinning section includes a high voltage power supply, a second spray device, an electrostatic injection unit, a solvent atomization generator for atomizing the liquid solvent, and a spinning solution hopper connected to the electrostatic injection unit. The electrostatic ejection unit also includes a second nozzle that connects to a high voltage power supply. The first nozzle and the second nozzle are positioned above the collecting conveyor belt, facing each other with a distance D of 26 cm. The distance between the first nozzle and the collecting conveyor belt is 40 cm, and the distance between the second nozzle and the collecting conveyor belt is 40 cm. The first blowing device comprises an air supply device, an inner cylinder, an outer cylinder, a standing plate I and a standing plate II. Furthermore, the outer cylinder is fitted onto the inner cylinder so that it is coaxial with the inner cylinder and both ends are flush with each other. One end of the outer cylinder and the inner cylinder are simultaneously sealed by standing plate I, and the other end is connected by standing plate II. The inner cylinder, the outer cylinder, the standing plate I and the standing plate II together form a sealed chamber. The outer cylinder is provided with an air flow inlet hole that connects to the air supply device via an air tube, and the diameter of the 450 jet holes randomly distributed on the inner cylinder is 0.7 mm. In the first blowing device, the outer diameter of the inner cylinder is 2 m, the inner diameter of the outer cylinder is 1.6 m, the wall thickness of the inner cylinder is 0.22 m, the wall thickness of the outer cylinder is 0.23 m, and the air supply device provides an air flow with a pressure of 15 MPa. The upright plate I of the first spray device is fitted onto the outside of the first nozzle, so that the jet discharged from the first nozzle is injected into the inner cylinder of the first spray device. The second blowing device includes six partition plates, an air supply device, an inner cylinder, an outer cylinder, a vertical plate I, and a vertical plate II. Furthermore, the outer cylinder is fitted onto the inner cylinder so that it is coaxial with the inner cylinder and both ends are flush with each other. One end of the outer cylinder and the inner cylinder are simultaneously sealed by the vertical plate I, and the other end is connected by the vertical plate II. The inner cylinder, the outer cylinder, the vertical plate I, and the vertical plate II together form a sealed chamber. The partition plates divide the sealed chamber into seven sub-sealed chambers parallel to the vertical plate I. The outer cylinder has Five airflow inlet holes are installed and connected to each sub-sealing chamber separately. Furthermore, a flow controller is installed on the airflow inlet holes so that the airflow rate of each airflow inlet hole increases according to the direction of the jet flow. The air pipes connected to the airflow inlet holes of each sub-sealing chamber are also connected to the 13-solvent atomization generator (i.e., the air pipes are connected to the air supply device and the solvent atomization generator at the same time). The diameter of the 440 jet holes randomly distributed on the inner cylinder is 0.75 mm. In the second blowing device, the outer diameter of the inner cylinder is 2 m, the inner diameter of the outer cylinder is 1.9 m, the wall thickness of the inner cylinder is 0.2 m, the wall thickness of the outer cylinder is 0.2 m, and the air supply device provides an air flow with a pressure of 19 MPa. The standing plate I of the second spray device is fitted onto the outside of the second nozzle, and the jet discharged from the second nozzle is injected into the inner cylinder of the second spray device. The inner cylinder of the first spraying device and the inner cylinder of the second spraying device are coaxial, the distance between the stand II and the nozzle I of the first spraying device is equal to the distance between the stand II and the second nozzle of the second spraying device, and X is 51% of D. The manufacturing method of composite ultrafine nanofiber material by flash electrostatic spinning is carried out by adopting the above-mentioned enhanced flash electrostatic composite spinning equipment. Before starting the equipment, prepare the following: Inject an electrospinning solution into an electrospinning solution hopper, the solution containing polyurethane, C8 telomer (5003F, Daikin) and 1H,6H-perfluorohexane, with a polyurethane concentration of 20 wt% and a C8 telomer concentration of 5 wt%; The electrostatic spinning conditions are set as follows: the feed rate is 6 mL / min, the spinning voltage is 70 kV, the environmental temperature is 24 °C, and the environmental relative humidity is 50%; Inject 1H,6H-perfluorohexane into the solvent mist generator; Depending on the direction of the jet, the airflow rate of the airflow inlet of each sub-sealed chamber is 14m 3 / h, 17m 3 / h, 28m 3 / h, 33m 3 / h, 38m 3 / h, 43m 3 / h, 50m 3 / h; After the equipment is started, add a certain amount of polyethylene, which has a melting point of 133°C and a melt flow rate of 0.7g / 10min measured under a temperature of 160°C and a load of 5kg, to the polymer hopper, and add a certain amount of cyclopentane to the solvent hopper, so as to form a flash spinning solution with a concentration of 15wt% in the high-temperature autoclave; Set up flash spinning conditions: pressure 19 MPa, temperature 200 °C, stirring speed 1100 rpm; The upper hot press roll and the lower hot press roll are controlled to hot press the sheet formed of nanofibers and micron fibers at a temperature of 90° C. for 0.5 min. After completing the above preparations, start up the equipment to produce composite ultrafine nanofiber materials by flash electrospinning. The obtained fiber material exhibited a sheet structure composed of nanofibers with an average diameter of 300 nm and micron fibers with an average diameter of 12 μm, in which the micron fibers were entangled and penetrated each other, the nanofibers were distributed among the micron fibers, and some of the nanofibers were entangled and penetrated each other with the micron fibers. Adhesion occurred between the nanofibers, between the micron fibers, and between the nanofibers and the micron fibers. The mass ratio of the nanofibers to the micron fibers was 33:100, and the strength was 510 N / 50 mm, the porosity was 91%, and the moisture permeability was 3600 g / m 2 -24h, water resistance is 34kPa.

[0043] Example 5 The enhanced flash-electrostatic composite spinning equipment includes a flash spinning section, an electrostatic spinning section, a grounded collecting conveyor belt, and upper and lower hot press rolls located above and below the collecting conveyor belt. The flash spinning section includes a flash injection unit, a first spray device, a polymer hopper, a solvent hopper and a high-temperature and high-pressure kettle, and the polymer hopper, the solvent hopper and the flash injection unit are simultaneously connected to the high-temperature and high-pressure kettle. The flash ejection unit includes a first nozzle connected to the ground. The electrostatic spinning section includes a high voltage power supply, a second spray device, an electrostatic injection unit, a solvent atomization generator for atomizing the liquid solvent, and a spinning solution hopper connected to the electrostatic injection unit. The electrostatic ejection unit also includes a second nozzle that connects to a high voltage power supply. The first nozzle and the second nozzle are positioned on the collecting conveyor belt facing each other with a distance D of 32 cm between them. The distance between the first nozzle and the collecting conveyor belt is 50 cm, and the distance between the second nozzle and the collecting conveyor belt is 50 cm. The first blowing device comprises an air supply device, an inner cylinder, an outer cylinder, a standing plate I and a standing plate II. Furthermore, the outer cylinder is fitted onto the inner cylinder so that it is coaxial with the inner cylinder and both ends are flush with each other. One end of the outer cylinder and the inner cylinder are simultaneously sealed by standing plate I, and the other end is connected by standing plate II. The inner cylinder, the outer cylinder, the standing plate I and the standing plate II together form a sealed chamber. The outer cylinder is provided with an air flow inlet hole that connects to the air supply device via an air tube. The diameter of the 470 jet holes randomly distributed on the inner cylinder is 0.9 mm. In the first blowing device, the outer diameter of the inner cylinder is 2.5 m, the inner diameter of the outer cylinder is 2.3 m, the wall thickness of the inner cylinder is 0.25 m, the wall thickness of the outer cylinder is 0.27 m, and the air supply device provides an air flow with a pressure of 20 MPa. The upright plate I of the first spray device is fitted onto the outside of the first nozzle, so that the jet discharged from the first nozzle is injected into the inner cylinder of the first spray device. The second blowing device includes seven partition plates, an air supply device, an inner cylinder, an outer cylinder, a vertical plate I, and a vertical plate II. Furthermore, the outer cylinder is fitted onto the inner cylinder so that it is coaxial with the inner cylinder and both ends are flush with each other. One end of the outer cylinder and the inner cylinder are simultaneously sealed by the vertical plate I, and the other end is connected by the vertical plate II. The inner cylinder, the outer cylinder, the vertical plate I, and the vertical plate II together form a sealed chamber. The partition plates divide the sealed chamber into eight sub-sealed chambers parallel to the vertical plate I. The outer cylinder has Five airflow inlet holes are installed and connected to each sub-sealing chamber separately. Furthermore, in order to increase the airflow rate of each airflow inlet hole according to the direction of the jet flow, a flow controller is installed on the airflow inlet holes. The air pipes connected to the airflow inlet holes of each sub-sealing chamber are also connected to the 13-solvent atomization generator (i.e., the air pipes are connected to the air supply device and the solvent atomization generator at the same time). The diameter of the 460 jet holes randomly distributed on the inner cylinder is 0.88 mm. In the second blowing device, the outer diameter of the inner cylinder is 2.5 m, the inner diameter of the outer cylinder is 2.3 m, the wall thickness of the inner cylinder is 0.23 m, the wall thickness of the outer cylinder is 0.23 m, and the air supply device provides an air flow with a pressure of 25.9 MPa. The standing plate I of the second spray device is fitted onto the outside of the second nozzle, and the jet discharged from the second nozzle is injected into the inner cylinder of the second spray device. The inner cylinder of the first spraying device and the inner cylinder of the second spraying device are coaxial, the distance between the stand II and the nozzle I of the first spraying device is equal to the distance between the stand II and the second nozzle of the second spraying device, and X is 54% of D. The manufacturing method of composite ultrafine nanofiber material by flash electrostatic spinning is carried out by adopting the above-mentioned enhanced flash electrostatic composite spinning equipment. Before starting the equipment, prepare the following: Pour an electrospinning solution into the electrospinning solution hopper, the electrospinning solution containing polyvinyl butyral and n-pentane, and the polyvinyl butyral concentration is 30 wt%; The electrostatic spinning conditions are set as follows: the feed rate is 8 mL / min, the spinning voltage is 80 kV, the environmental temperature is 25 °C, and the environmental relative humidity is 35%; Inject n-pentane into the solvent atomization generator; Depending on the direction of the jet, the airflow rate of the airflow inlet of each sub-sealed chamber is 6m 3 / h, 12m 3 / h, 18m 3 / h, 27m 3 / h, 34m 3 / h, 36m 3 / h, 39m 3 / h, 45m 3 / h; After the equipment is started, add a certain amount of polyethylene, which has a melting point of 133°C and a melt flow rate of 0.7g / 10min measured under a temperature of 160°C and a load of 5kg, to the polymer hopper, and add a certain amount of dichloromethane to the solvent hopper, so as to form a flash spinning solution with a concentration of 27wt% in the high-temperature autoclave; Set up flash spinning conditions: pressure 25 MPa, temperature 180°C, stirring speed 1300 rpm; The upper hot press roll and the lower hot press roll are controlled to hot press the sheet formed of nanofibers and micron fibers at a temperature of 110° C. for a time of 0.6 min. After completing the above preparations, start up the equipment to produce composite ultrafine nanofiber materials by flash electrospinning. The obtained fiber material had a sheet structure composed of nanofibers with an average diameter of 580 nm and micron fibers with an average diameter of 16 μm, in which the micron fibers were entangled and penetrated each other, the nanofibers were distributed among the micron fibers, and some of the nanofibers were entangled and penetrated each other, and adhesion occurred between the nanofibers, between the micron fibers, and between the nanofibers and the micron fibers. The mass ratio of the nanofibers to the micron fibers was 7:20, and the strength was 550 N / 50 mm, the porosity was 91%, and the moisture permeability was 4200 g / m 2 -24h, water resistance is 26kPa.

[0044] Example 6 The enhanced flash-electrostatic composite spinning equipment includes a flash spinning section, an electrostatic spinning section, a grounded collecting conveyor belt, and upper and lower hot press rolls located above and below the collecting conveyor belt. The flash spinning section includes a flash injection unit, a first spray device, a polymer hopper, a solvent hopper and a high-temperature and high-pressure kettle, and the polymer hopper, the solvent hopper and the flash injection unit are simultaneously connected to the high-temperature and high-pressure kettle. The flash ejection unit includes a first nozzle connected to the ground. The electrostatic spinning section includes a high voltage power supply, a second spray device, an electrostatic injection unit, a solvent atomization generator for atomizing the liquid solvent, and a spinning solution hopper connected to the electrostatic injection unit. The electrostatic ejection unit also includes a second nozzle that connects to a high voltage power supply. The first nozzle and the second nozzle are positioned on the collecting conveyor belt facing each other with a distance D of 40 cm between them. The distance between the first nozzle and the collecting conveyor belt is 60 cm, and the distance between the second nozzle and the collecting conveyor belt is 60 cm. The first blowing device comprises an air supply device, an inner cylinder, an outer cylinder, a standing plate I and a standing plate II, and furthermore, the outer cylinder is fitted onto the inner cylinder so that it is coaxial with the inner cylinder and both ends are flush with each other, one end of the outer cylinder and the inner cylinder are simultaneously sealed by standing plate I, and the other end is connected by standing plate II, the inner cylinder, the outer cylinder, the standing plate I and the standing plate II together form a sealed chamber, the outer cylinder is provided with an air flow inlet hole that connects to the air supply device via an air tube, and the hole diameter of 500 jet holes randomly distributed on the inner cylinder is 1 mm. In the first blowing device, the outer diameter of the inner cylinder is 3 m, the inner diameter of the outer cylinder is 2.7 m, the wall thickness of the inner cylinder is 0.3 m, and the wall thickness of the outer cylinder is 0.3 m, and the air supply device provides an air flow with a pressure of 30 MPa. The upright plate I of the first spray device is fitted onto the outside of the first nozzle, so that the jet discharged from the first nozzle is injected into the inner cylinder of the first spray device. The second spraying device includes eight partitions, an air supply device, an inner cylinder, an outer cylinder, a vertical plate I and a vertical plate II. The outer cylinder is fitted onto the inner cylinder so that it is coaxial with the inner cylinder and both ends are flush with each other. One end of the outer cylinder and the inner cylinder are sealed by the vertical plate I at the same time, and the other end is connected by the vertical plate II. The inner cylinder, the outer cylinder, the vertical plate I and the vertical plate II together form a sealed chamber. The partitions divide the sealed chamber into nine sub-sealed chambers parallel to the vertical plate I. The outer cylinder is provided with five airflow inlet holes which are connected to each sub-sealed chamber separately. In addition, the airflow rate of each airflow inlet hole increases according to the direction of the jet, so that the airflow controller is installed on the airflow inlet holes. The air pipes connected to the airflow inlet holes of each sub-sealed chamber are also connected to the 13-solvent atomization generator (i.e., the air pipes are connected to the air supply device and the solvent atomization generator at the same time). The diameter of the 500 jet holes randomly distributed on the inner cylinder is 1 mm. In the second blowing device, the outer diameter of the inner cylinder is 3 m, the inner diameter of the outer cylinder is 2.7 m, the wall thickness of the inner cylinder is 0.3 m, the wall thickness of the outer cylinder is 0.3 m, and the air supply device provides an air flow with a pressure of 30 MPa. The standing plate I of the second spray device is fitted onto the outside of the second nozzle, and the jet discharged from the second nozzle is injected into the inner cylinder of the second spray device. The inner cylinder of the first spraying device and the inner cylinder of the second spraying device are coaxial, the distance between the stand II and the nozzle I of the first spraying device is equal to the distance between the stand II and the second nozzle of the second spraying device, and X is 59% of D. The manufacturing method of composite ultrafine nanofiber material by flash electrostatic spinning is carried out by adopting the above-mentioned enhanced flash electrostatic composite spinning equipment. Before starting the equipment, prepare the following: Pour an electrospinning solution into the electrospinning solution hopper, the electrospinning solution containing polyvinyl butyral and cyclopentane, and the polyvinyl butyral concentration is 40 wt%; The electrostatic spinning conditions are set as follows: the feed rate is 10 mL / min, the spinning voltage is 100 kV, the environmental temperature is 25 °C, and the environmental relative humidity is 20%; Inject cyclopentane into the solvent atomization generator; The airflow rate of the airflow inlet of each sub-sealed chamber is 3m apart depending on the direction of the jet. 3 / h, 7m 3 / h, 10m 3 / h, 15m 3 / h, 18m 3 / h, 21m 3 / h, 26m 3 / h, 31m 3 / h, 36m 3 / h; After the equipment is started, add a certain amount of polyethylene, which has a melting point of 133°C and a melt flow rate of 0.7g / 10min measured under a temperature of 160°C and a load of 5kg, to the polymer hopper, and add a certain amount of 1H,6H-perfluorohexane to the solvent hopper, so as to form a flash spinning solution with a concentration of 35wt% in the high-temperature autoclave; Set up flash spinning conditions: pressure 30 MPa, temperature 150°C, stirring speed 1500 rpm; The upper hot press roll and the lower hot press roll are controlled to hot press the sheet formed of nanofibers and micron fibers at a temperature of 110° C. for a time of 0.7 min. After completing the above preparations, start up the equipment to produce composite ultrafine nanofiber materials by flash electrospinning. The obtained fiber material exhibited a sheet structure composed of nanofibers with an average diameter of 760 nm and micron fibers with an average diameter of 20 μm, in which the micron fibers were entangled and interpenetrated with each other, the nanofibers were distributed among the micron fibers, and some of the nanofibers were entangled and interpenetrated with the micron fibers, and adhesion occurred between the nanofibers, between the micron fibers, and between the nanofibers and the micron fibers. The mass ratio of the nanofibers to the micron fibers was 2:5, and the strength was 580 N / 50 mm, the porosity was 93%, and the moisture permeability was 5900 g / m 2 -24h, water resistance is 18kPa.

[0045] Example 7 The enhanced flash electrostatic composite spinning equipment is generally the same as that in Example 1, except that the first spray device, the second spray device, the solvent atomization generator and the flow rate controller are not included. The manufacturing method of composite ultrafine nanofiber material by flash electrospinning adopts the above equipment, and further, before starting the equipment, the following preparations are made: Inject an electrospinning solution into the electrospinning solution hopper, the solution containing polyethylene, a silicone-based water repellent (SEAL80, AkzoNobel), and dimethylformamide, the polyethylene concentration being 2 wt%, and the silicone-based water repellent concentration being 0.5 wt%; Set up electrostatic spinning conditions as follows: feeding rate is 1 mL / min, spinning voltage is 30 kV, environmental temperature is 23 °C, and environmental relative humidity is 90%; Add a certain amount of polyethylene, which has a melting point of 133°C and a melt flow rate of 0.7g / 10min measured under a temperature of 160°C and a load of 5kg, to the polymer hopper, and add a certain amount of dichloromethane to the solvent hopper, so that a flash spinning solution with a concentration of 2wt% can be formed in the high-temperature autoclave; Set up flash spinning conditions: pressure 8 MPa, temperature 300°C, stirring speed 500 rpm; The upper hot press roll and the lower hot press roll are controlled to hot press the sheet formed of nanofibers and micron fibers at a temperature of 100° C. for a time of 0.2 min. After completing the above preparations, start up the equipment to produce composite ultrafine nanofiber materials by flash electrospinning. The resulting fiber material has a strength of 320N / 50mm, a porosity of 68%, and a moisture permeability of 830g / m 2 -Water resistance of 9kPa for 24 hours.

[0046] Example 8 The enhanced flash electrostatic composite spinning equipment is generally the same as that in Example 2, except that the first spray device, the second spray device, the solvent atomization generator and the flow rate controller are not included. The manufacturing method of composite ultrafine nanofiber material by flash electrospinning adopts the above equipment, and further, before starting the equipment, the following preparations are made: Inject an electrospinning solution into the electrospinning solution hopper, the solution containing polyvinylidene fluoride, C6 telomer (Z-2001, Kajitsu Co., Ltd.) and dimethylacetamide, in which the polyvinylidene fluoride concentration is 4 wt% and the C6 telomer concentration is 1 wt%; Set up electrostatic spinning conditions as follows: feed rate is 2 mL / min, spinning voltage is 40 kV, environmental temperature is 23 °C, and environmental relative humidity is 80%; Add a certain amount of polyethylene having a melting point of 133°C and a melt flow rate of 0.7g / 10min measured under a temperature of 160°C and a load of 5kg to the polymer hopper, and add a certain amount of 1H,6H-perfluorohexane to the solvent hopper, so that a flash spinning solution having a concentration of 6wt% is formed in the high-temperature autoclave; Set up flash spinning conditions: pressure 13 MPa, temperature 270 °C, stirring speed 700 rpm; The upper hot press roll and the lower hot press roll are controlled to hot press the sheet formed with nanofibers and micron fibers at a temperature of 130° C. for 0.3 min. After completing the above preparations, start up the equipment to produce composite ultrafine nanofiber materials by flash electrospinning. The resulting fiber material has a strength of 278N / 50mm, a porosity of 62%, and a moisture permeability of 990g / m 2 -Water resistance of 10.6kPa for 24 hours.

[0047] Example 9 The enhanced flash electrostatic composite spinning equipment is roughly the same as that in Example 1, except that the partition plate, solvent atomization generator and flow rate controller of the second spray device are not included. The manufacturing method of composite ultrafine nanofiber material by flash electrospinning adopts the above equipment, and further, before starting the equipment, the following preparations are made: Inject an electrospinning solution into the electrospinning solution hopper, the solution containing polyethylene, a silicone-based water repellent (SEAL80, AkzoNobel), and dimethylformamide, the polyethylene concentration being 2 wt%, and the silicone-based water repellent concentration being 0.5 wt%; Set up electrostatic spinning conditions as follows: feeding rate is 1 mL / min, spinning voltage is 30 kV, environmental temperature is 23 °C, and environmental relative humidity is 90%; Add a certain amount of polyethylene, which has a melting point of 133°C and a melt flow rate of 0.7g / 10min measured under a temperature of 160°C and a load of 5kg, to the polymer hopper, and add a certain amount of dichloromethane to the solvent hopper, so that a flash spinning solution with a concentration of 2wt% can be formed in the high-temperature autoclave; Set up flash spinning conditions: pressure 8 MPa, temperature 300°C, stirring speed 500 rpm; The upper hot press roll and the lower hot press roll are controlled to hot press the sheet formed of nanofibers and micron fibers at a temperature of 100° C. for a time of 0.2 min. After completing the above preparations, start up the equipment to produce composite ultrafine nanofiber materials by flash electrospinning. The resulting fiber material has a strength of 260N / 50mm, a porosity of 58%, and a moisture permeability of 880g / m 2 -Water resistance is 8.1kPa for 24 hours.

[0048] Example 10 The enhanced flash electrostatic composite spinning equipment is roughly the same as that in Example 2, except that the partition plate, solvent atomization generator and flow controller of the second spray device are not included. The manufacturing method of composite ultrafine nanofiber material by flash electrospinning adopts the above equipment, and further, before starting the equipment, the following preparations are made: Inject an electrospinning solution into the electrospinning solution hopper, the solution containing polyvinylidene fluoride, C6 telomer (Z-2001, Kajitsu Co., Ltd.) and dimethylacetamide, in which the polyvinylidene fluoride concentration is 4 wt% and the C6 telomer concentration is 1 wt%; Set up electrostatic spinning conditions as follows: feed rate is 2 mL / min, spinning voltage is 40 kV, environmental temperature is 23 °C, and environmental relative humidity is 80%; Add a certain amount of polyethylene having a melting point of 133°C and a melt flow rate of 0.7g / 10min measured under a temperature of 160°C and a load of 5kg to the polymer hopper, and add a certain amount of 1H,6H-perfluorohexane to the solvent hopper, so that a flash spinning solution having a concentration of 6wt% is formed in the high-temperature autoclave; Set up flash spinning conditions: pressure 13 MPa, temperature 270 °C, stirring speed 700 rpm; The upper hot press roll and the lower hot press roll are controlled to hot press the sheet formed with nanofibers and micron fibers at a temperature of 130° C. for 0.3 min. After completing the above preparations, start up the equipment to produce composite ultrafine nanofiber materials by flash electrospinning. The resulting fiber material has a strength of 340N / 50mm, a porosity of 69%, and a moisture permeability of 1180g / m 2 -Water resistance of 12kPa for 24 hours.

[0049] Example 11 The intensive flash electrostatic composite spinning equipment is roughly the same as that in Example 1, except that there is no upper hot press roll and lower hot press roll located on both the upper and lower sides of the collecting conveyor belt. The manufacturing method of composite ultrafine nanofiber material by flash electrospinning adopts the above equipment, and further, before starting the equipment, the following preparations are made: Inject an electrospinning solution into the electrospinning solution hopper, the solution containing polyethylene, a silicone-based water repellent (SEAL80, AkzoNobel), and dimethylformamide, the polyethylene concentration being 2 wt%, and the silicone-based water repellent concentration being 0.5 wt%; Set up electrostatic spinning conditions as follows: feeding rate is 1 mL / min, spinning voltage is 30 kV, environmental temperature is 23 °C, and environmental relative humidity is 90%; Inject dimethylformamide into the solvent mist generator; Depending on the direction of the jet, the airflow rate of the airflow inlet of each sub-sealed chamber is 10m apart. 3 / h, 18m 3 / h, 32m 3 / h, 36m 3 / h, 40m 3 / h; Add a certain amount of polyethylene, which has a melting point of 133°C and a melt flow rate of 0.7g / 10min measured under a temperature of 160°C and a load of 5kg, to the polymer hopper, and add a certain amount of dichloromethane to the solvent hopper, so that a flash spinning solution with a concentration of 2wt% can be formed in the high-temperature autoclave; Set up flash spinning conditions: pressure 8 MPa, temperature 300°C, stirring speed 500 rpm; After completing the above preparations, start up the equipment to produce composite ultrafine nanofiber materials by flash electrospinning. The resulting fiber material has a strength of 110N / 50mm, a porosity of 75%, and a moisture permeability of 1300g / m 2 -Water resistance of 6kPa for 24 hours.

[0050] Example 12 The enhanced flash electrostatic composite spinning equipment is roughly the same as that in Example 2, except that there is no upper hot press roll and lower hot press roll located on both the upper and lower sides of the collecting conveyor belt. The manufacturing method of composite ultrafine nanofiber material by flash electrospinning adopts the above equipment, and further, before starting the equipment, the following preparations are made: Inject an electrospinning solution into the electrospinning solution hopper, the solution containing polyvinylidene fluoride, C6 telomer (Z-2001, Kajitsu Co., Ltd.) and dimethylacetamide, in which the polyvinylidene fluoride concentration is 4 wt% and the C6 telomer concentration is 1 wt%; Set up electrostatic spinning conditions as follows: feed rate is 2 mL / min, spinning voltage is 40 kV, environmental temperature is 23 °C, and environmental relative humidity is 80%; Inject dimethylacetamide into the solvent atomization generator; Depending on the direction of the jet, the airflow rate of the airflow inlet of each sub-sealed chamber is 12m 3 / h, 20m 3 / h, 34m 3 / h, 38m 3 / h, 44m 3 / h; Add a certain amount of polyethylene having a melting point of 133°C and a melt flow rate of 0.7g / 10min measured under a temperature of 160°C and a load of 5kg to the polymer hopper, and add a certain amount of 1H,6H-perfluorohexane to the solvent hopper, so that a flash spinning solution having a concentration of 6wt% is formed in the high-temperature autoclave; Set up flash spinning conditions: pressure 13 MPa, temperature 270 °C, stirring speed 700 rpm; After completing the above preparations, start up the equipment to produce composite ultrafine nanofiber materials by flash electrospinning. The resulting fiber material has a strength of 105N / 50mm, a porosity of 72%, and a moisture permeability of 1280g / m 2 -Water resistance of 5.5kPa for 24 hours.

Claims

1. It comprises a flash spinning section, an electrostatic spinning section and a grounded collecting conveyor belt (9), The flash spinning section includes a flash injection unit (5) including a first nozzle connected to ground, and the electrostatic spinning section includes a high voltage power supply (8) and an electrostatic injection unit (6) including a second nozzle connected to the high voltage power supply (8); The first nozzle and the second nozzle are positioned on the collecting conveyor belt so as to face each other with a distance D of 15 to 40 cm therebetween; The flash spinning section also includes a first spray device (4), and the electrostatic spinning section also includes a second spray device (12); The first blowing device (4) and the second blowing device (12) each include an air supply device, an inner cylinder, an outer cylinder, a standing plate I, and a standing plate II. the outer cylinder is coaxial with the inner cylinder and is provided on the outer circumferential side of the inner cylinder such that both ends of the outer cylinder and the inner cylinder are flush with each other; The outer cylinder and the inner cylinder are sealed at one end by a vertical plate I and connected at the other end by a vertical plate II. The inner cylinder, the outer cylinder, the standing plate I and the standing plate II together form a sealed chamber, The outer cylinder is formed with an airflow inlet hole that is connected to the air supply device via a trachea; The inner cylinder has multiple jet holes randomly formed, The vertical plate II of the first blowing device (4) and the vertical plate II of the second blowing device (12) are disposed opposite to each other with a gap therebetween, The vertical plate I of the first spray device (4) is fitted onto the outside of the first nozzle, so that the jet discharged from the first nozzle is injected into the inner cylinder of the first spray device (4), The vertical plate I of the second spray device (12) is fitted onto the outside of the second nozzle, so that the jet discharged from the second nozzle is injected into the inner cylinder of the second spray device (12); The first spray device (4) randomly emits flash-discharged micron fibers; A second spray device (12) randomly ejects electrostatically ejected nanofibers; The micron fibers emitted from the first spray device (4) and the nano fibers emitted from the second spray device (12) are entangled. The intensified flash electrostatic composite spinning equipment is characterized by the above.

2. The inner cylinder of the first spray device (4) and the inner cylinder of the second spray device (12) are arranged coaxially, The distance between the stand II and the first nozzle of the first spray device (4) is equal to the distance between the stand II and the second nozzle of the second spray device (12).

2. The intensive flash electrostatic composite spinning equipment according to claim 1 .

3. The electrostatic spinning unit also includes a solvent atomization generator (13) for atomizing the liquid solvent, and the second blowing device (12) also includes a plurality of partition plates parallel to the vertical plate I for dividing the sealing chamber into a plurality of child sealing chambers, the outer cylinder of the second blowing device (12) has a plurality of airflow inlet holes, each child sealing chamber communicates with at least one airflow inlet hole, and an airflow control device is attached to the airflow inlet holes, the airflow rate of each airflow inlet hole gradually increases along the jet traveling direction, and the air pipes connected to the airflow inlet holes of each child sealing chamber are also connected to the solvent atomization generator (13).

2. The intensive flash electrostatic composite spinning equipment according to claim 1 .

4. The flash spinning section also includes a polymer hopper (1), a solvent hopper (2) and a high-temperature high-pressure kettle (3), and the polymer hopper (1), the solvent hopper (2) and the flash injection unit (5) are simultaneously connected to the high-temperature high-pressure kettle (3).

2. The intensive flash electrostatic composite spinning equipment according to claim 1 .

5. The intensive flash electrostatic composite spinning installation according to claim 1, characterized in that the electrostatic spinning section also includes an electrostatic spinning solution hopper (7) connected to the electrostatic injection unit (6).

6. The enhanced flash electrostatic composite spinning equipment as described in claim 1, characterized in that the distance between the first nozzle or the second nozzle and the collecting conveyor belt (9) is 10 to 60 cm.

7. The intensive flash electrostatic composite spinning equipment according to claim 1, further comprising an upper hot press roll (10) and a lower hot press roll (11) located on both the upper and lower sides of the collecting conveyor belt (9).

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