CN112030245A - Needle type spray head vertical electrostatic spinning device and system - Google Patents

Abstract

The application discloses a perpendicular electrostatic spinning device of needle type spray head and a system. The device comprises a needle type spinning nozzle, a receiving electrode, a positioning roll shaft, a high-voltage direct-current power supply, a winding system and an unwinding system. The collecting electrode is a metal plate, wire or rod, and two positioning roller shafts arranged along the vertical direction are used for supporting and positioning the collecting substrate. The traditional horizontal spinning equipment needs to apply larger tension to keep the base cloth straight, more roller shafts are needed, fibers need to be in contact with the roller shafts, and the phenomenon that the fibers stick to the roller shafts often occurs; the vertically placed substrate can naturally keep straight without applying large tension, and at least two roller shafts can be used, so that the direct contact between the electrospun fibers and the roller shafts is avoided, and the problem that the fibers are stuck to the roller is solved. Because the vertically arranged base cloth can keep straight without applying large tension, the problem of pulling and cracking the base can be avoided. In addition, the vertical collection reduces the influence of the self gravity of the tows on the spinning effect, avoids the phenomenon of yarn hanging and solves the problem of stubborn problems in the field of electrostatic spinning.

Description

Needle nozzle vertical electrospinning device and system

technical field

The present application relates to the field of electrospinning, and in particular, to a vertical electrospinning device and system with a needle-type nozzle.

Background technique

Electrospinning is the main method for preparing polymer nanofiber membranes. It uses electric field force to stretch and deform the spinning solution or melt droplets in a high-voltage electric field to obtain nanofibers. When the droplet is subjected to electrostatic traction, it will change from a spherical shape to a Taylor cone shape, and extend from the tip of the cone to obtain fiber filaments. These filaments fall on the substrate, and the solvent evaporates and then solidifies to obtain a nanometer diameter polymer fiber film.

In the large-scale production of nanofibers, electrospinning is an indispensable production technology. However, the current electrospinning technology and related electrospinning nanofiber materials are still in the research stage, and there are still many problems to be overcome. Due to the limitation of production equipment, the vast majority of nanofibers cannot be formed into a film alone, and need to be adsorbed on the substrate. For the traditional horizontally arranged collection substrate, it is often necessary to apply a large tension to maintain the straightness of the substrate fabric, so the strength of the substrate is required. high, otherwise the substrate will be pulled apart, resulting in a lower strength substrate that cannot be spun. Similarly, the traditional horizontal spinning equipment needs to exert a large tension to keep the base fabric straight, so more rollers are required, and the electrospun fiber membrane needs to be in contact with the roller surface.

At the same time, in the production process of electrospinning, due to the influence of electric field strength, self-gravity and other factors, the tow will be entangled with each other during the long-term spinning process, forming a visible hanging yarn phenomenon, which affects the spinning. quality. The present invention solves these problems in one fell swoop by using vertical spinning.

SUMMARY OF THE INVENTION

The purpose of the present application is to provide a needle-type nozzle vertical electrospinning device and system, which aims to improve the problems of tearing of the base fabric, sticking to the film surface and hanging yarn, which are easy to occur in the existing electrospinning device.

In a first aspect, the present application provides a needle-type nozzle vertical electrospinning device, comprising:

positioning rollers, used for transporting and positioning the receiving substrate; the positioning rollers include at least two;

a receiving electrode, disposed vertically between the two positioning roller shafts, outside the receiving base and parallel to the receiving base; and

The needle-type spray heads are arranged on the other side of the receiving substrate, and are arranged in a vertical direction, and the wire-out direction of the needle-type spray heads is perpendicular to the receiving substrate.

This vertical collection structure enables the receiving substrate to remain straight and does not need to exert great tension, thereby avoiding the problem of excessive tension to tear the substrate. Also, since the substrate can be kept straight without applying a large tension, there is no need to use many rollers, just use two positioning rollers, which can avoid the direct contact between the electrospun fibers and the rollers, and solve the problem of fiber sticking. The problem. At the same time, the vertical collection reduces the influence of the tow's own gravity on the spinning effect, thereby avoiding the phenomenon of hanging yarns and solving the common stubborn problem in the field of electrospinning.

In other embodiments of the present application, the above-mentioned needle-type nozzle as a spinneret electrode is electrically connected to the opposite electrode to that of the receiving electrode; the needle-type nozzle includes a plurality of nozzle bodies, which are regularly arranged in the vertical direction, and two adjacent rows of needle-type nozzles Staggered settings.

In other embodiments of the present application, the aperture size of each of the above-mentioned needle-type spray heads is 0.1 mm-1 mm; the distance between two adjacent needle-type spray heads in each row is 20 mm-50 mm.

In other embodiments of the present application, the horizontal distance between the above-mentioned needle spray head and the receiving electrode is 50mm-600mm.

In other embodiments of the present application, the above-mentioned receiving electrodes include conductive metal; the shapes of the receiving electrodes are rod-shaped, wire-shaped or plate-shaped; the rod-shaped or wire-shaped electrodes are placed parallel to the horizontal plane, and the plate-shaped electrodes are placed perpendicular to the horizontal plane .

In other embodiments of the present application, the length of the plate-shaped receiving electrode is 100mm-4000mm, the width is 100mm-2000mm, and the thickness is 0.5mm-5mm;

The length of the rod-shaped or filament-shaped receiving electrode is 100mm-2000mm, and the diameter is 0.1mm-100mm.

In other embodiments of the present application, the above-mentioned positioning rollers include two, and the receiving electrodes are vertically arranged between the two positioning rollers.

In other embodiments of the present application, the length of the positioning roller is 100mm-2000mm; the diameter of the positioning roller is 40mm-100mm.

In other embodiments of the present application, the surface of the positioning roller is provided with an insulating high molecular polymer layer; the high molecular polymer is selected from polytetrafluoroethylene, polyethylene, polypropylene, polyurethane, polyoxymethylene or nitrile Any kind of rubber;

The thickness of the insulating high molecular polymer layer is 5mm-10mm.

In a second aspect, the present application provides a needle-type nozzle vertical electrospinning system, comprising the aforementioned electrospinning device; and

Rewinding and unwinding device, in cooperation with positioning rollers, is used to transport the receiving substrate.

In the electrospinning system of the present application, by setting the above electrospinning device, the distribution of the nanofiber membrane can be made more uniform, which solves the problems of hanging yarn, uneven membrane surface and long distance between the membrane surface in the traditional horizontal spinning collection process. sagging problem. The number of rollers can be reduced, and at the same time, the surface of the fiber film is not in contact with the rollers, which effectively solves the problem of sticking of nanofibers. In addition, the tension of the receiving substrate can be reduced and a lower strength receiving substrate can be used for collection. Greatly improve the spinning efficiency and spinning quality. Moreover, the system has the advantages of simple structure, low cost and flexible and convenient operation. There is no need to modify other components of the electrospinning equipment, and it can be flexibly adjusted according to the actual application, which can significantly reduce the maintenance difficulty and maintenance cost of the equipment.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present application more clearly, the following briefly introduces the accompanying drawings that need to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore do not It should be regarded as a limitation of the scope, and for those of ordinary skill in the art, other related drawings can also be obtained according to these drawings without any creative effort.

1 is a schematic structural diagram of a needle-type nozzle vertical electrospinning device provided in an embodiment of the application;

2 is a schematic diagram of the arrangement of needle nozzles of a needle nozzle vertical electrospinning device provided by an embodiment of the application;

3 is a schematic diagram of the arrangement of rod-shaped or filament-shaped receiving electrodes of the vertical electrospinning device of the needle nozzle provided in the embodiment of the present application;

4 is a schematic structural diagram of a needle-type nozzle vertical electrospinning system provided in an embodiment of the application;

5 is a scanning electron microscope picture of the nanofibers prepared in Examples 1 to 4 of the present application.

Icon: 100-needle nozzle vertical electrospinning device; 101-shell; 102-separator; 103-fabric inlet; 104-fabric outlet; 110-positioning roller; 120-receiving electrode; 130-needle nozzle; 131 - nozzle body; 140 - high voltage DC power supply; 150 - receiving substrate; 200 - electrospinning system; 210 - unwinding system; 220 - winding system.

Detailed ways

In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments It is a part of the embodiments of the present application, but not all of the embodiments. The components of the embodiments of the present application generally described and illustrated in the drawings herein may be arranged and designed in a variety of different configurations.

Thus, the following detailed description of the embodiments of the application provided in the accompanying drawings is not intended to limit the scope of the application as claimed, but is merely representative of selected embodiments of the application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

It should be noted that like numerals and letters refer to like items in the following figures, so once an item is defined in one figure, it does not require further definition and explanation in subsequent figures.

Furthermore, the terms "first", "second", etc. are only used to differentiate the description and should not be construed to indicate or imply relative importance.

Referring to FIGS. 1 to 3 , an embodiment of the present application provides a needle-type nozzle vertical electrospinning device 100 , including: a positioning roller 110 , a receiving electrode 120 , and a needle-type nozzle 130 .

Further, the positioning rollers 110 are used to transport the receiving substrate 150 . The positioning rollers 110 include at least two.

Referring to FIG. 1 , in the illustrated embodiment, the above-mentioned positioning roller shafts 110 include two. The two positioning rollers 110 are arranged opposite to each other up and down.

Further, in some embodiments of the present application, the above-mentioned vertical electrospinning device 100 with a needle nozzle includes a housing 101 . The above-mentioned positioning roller 110 , the receiving electrode 120 and the needle-type spray head 130 are arranged in the casing 101 .

Further, a partition 102 is provided inside the casing 101 . The aforementioned receiving electrode 120 is perpendicular to the separator 102 , the two positioning rollers 110 are arranged parallel to the separator 102 , and the receiving electrode 120 is vertically arranged in the middle of the two positioning rollers 110 . Two positioning rollers 110 are used to transport the receiving substrate 150 for electrospinning film formation.

Further, a cloth inlet 103 is provided on the top of the casing 101 , and a cloth outlet 104 is arranged on the separator 102 , and the substrate receiving substrate 150 used for electrospinning film formation can enter the casing from the cloth inlet 103 101, and then transmitted through the positioning roller 110, during the transmission process, the nanofiber filaments sprayed by the needle nozzle 130 are received on the receiving substrate 150, and under the action of the electric field, the nanofibers are adsorbed on the receiving substrate 150 to form nanofibers membrane. Then, the formed nanofiber membrane is delivered through the outlet 104 .

The above-mentioned receiving substrate 150 can be selected from any one of non-woven fabric, melt-blown fabric and spunlace cotton.

Further optionally, the weight of the receiving substrate 150 grams is 30g-100g. Further optionally, the receiving substrate 150 grams weighs 35g-90g. Illustratively, the receiving substrate 150 grams weighs 40g, 50g, 60g, or 80g.

Further optionally, the width and length of the receiving substrate 150 are 100mm-1800mm. Further optionally, the width and length of the receiving substrate 150 are 200mm-1700mm. Illustratively, the receiving substrate 150 is 300mm, 500mm, 800mm, 1000mm, 1500mm or 1600mm in width and length.

Under the action of the electric field, the nanofiber filaments ejected from the needle nozzle 130 can be adsorbed on the receiving substrate 150 of the above-mentioned various materials to form a nanofiber film.

Further, the receiving electrode 120 is disposed on one side of the receiving substrate 150 , and the needle spray head 130 is disposed on the other side of the receiving substrate 150 . The receiving electrode 120 is vertically disposed between the at least two positioning rollers 110 and parallel to the receiving substrate 150 .

In the illustrated embodiment, the above-mentioned needle spray head 130 is disposed on the side facing the receiving surface of the receiving substrate 150 , and the above-mentioned receiving electrode 120 is disposed on the back side of the receiving surface of the receiving substrate 150 .

Further, the spinning direction of the above-mentioned needle nozzle 130 is perpendicular to the receiving substrate 150 .

The inventor found that at present, the electrospinning device in the conventional technology is prone to damage caused by friction on the membrane surface, which is due to the common horizontally arranged receiving substrate, the receiving substrate is arranged directly above the needle nozzle 130, and the membrane surface is damaged. Downward, the positioning roller 110 is disposed on the film surface side, and the positioning roller 110 will inevitably cause friction to the film surface during the winding process, thereby causing certain damage to the film surface.

The needle-type nozzle vertical electrospinning device 100 of the present application is arranged by vertically disposing the receiving electrode 120 between at least two positioning rollers 110 and parallel to the receiving substrate 150, and the spinning direction of the needle-type nozzle 130 is perpendicular to the receiving substrate. 150. This structure can ensure that the nanofiber film on the receiving substrate 150 will never contact the positioning roller 110, and avoid damage caused by the friction of the positioning roller 110 on the film surface, thereby effectively solving this problem.

Further, the spinning direction of the needle-type nozzle 130 is perpendicular to the receiving substrate 150. Compared with the prior art solution in which the receiving substrate 150 is arranged directly above the needle-type nozzle 130, the phenomenon such as yarn hanging on the receiving substrate 150 can be avoided.

Further, the inventors found that the current conventional electrospinning device is horizontally arranged on the receiving substrate directly above the needle nozzle 130, therefore, a relatively large tension is required to flatten the receiving substrate to ensure uniform formation on the receiving substrate. of nanofiber membranes. However, when the tension of the receiving substrate is too large, the film surface is easily torn. However, in the solution of the present application, since the receiving substrate is arranged vertically, the receiving substrate can be stretched and flattened without great tension, thereby avoiding the problem of tearing the film surface with excessive tension.

Further, the above-mentioned needle spray head 130 includes a plurality of spray head bodies 131 .

The work efficiency can be effectively improved by arranging a plurality of nozzles.

Further, the above-mentioned plurality of showerhead bodies 131 include multiple rows, and the showerhead bodies 131 of two adjacent rows are arranged in a staggered manner.

By arranging the above-mentioned plurality of needle nozzles in a staggered manner, the film formed in the receiving substrate row can be made more uniform.

1 and 2, in the illustrated embodiment, the above-mentioned plurality of showerhead bodies 131 includes a plurality of columns. The nozzle bodies 131 of two adjacent rows are arranged in a staggered manner.

Further, the aperture size of each nozzle body 131 is 0.1 mm-1 mm; the distance between two adjacent nozzle bodies 131 in each row is 20 mm-50 mm.

By setting the aperture size of each nozzle body 131 to be 0.1 mm-1 mm, nanofibers with moderate fineness and high strength can be ejected. By setting the distance between the two adjacent nozzle bodies 131 in each row to be 20mm-50mm, the film forming effect can be better, and the uniformity and flatness can be better.

Further optionally, the aperture size of each nozzle body 131 is 0.2 mm-0.9 mm; the distance between each adjacent two nozzle bodies 131 is 25 mm-45 mm.

Further optionally, the aperture size of each nozzle body 131 is 0.3mm-0.8mm; the distance between each adjacent two nozzle bodies 131 is 30mm-40mm.

Exemplarily, the aperture size of each nozzle body 131 is 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm or 0.8 mm.

Exemplarily, the distance between each adjacent two spray head bodies 131 is 25 mm and 30 mm. 35mm or 40mm.

Further, the horizontal distance between the needle spray head 130 and the receiving electrode 120 is 50mm-600mm.

By setting the above-mentioned horizontal distance between the needle nozzle 130 and the receiving electrode 120 to 50mm-600mm, it can ensure that the nanofiber filaments ejected from the needle nozzle have a sufficient distance to form the nanofiber filaments and reach the receiving substrate 150 well. .

Further optionally, the horizontal distance between the needle spray head 130 and the receiving electrode 120 is 100mm-550mm.

Further optionally, the horizontal distance between the needle spray head 130 and the receiving electrode 120 is 150mm-500mm.

Illustratively, the horizontal distance between the needle spray head 130 and the receiving electrode 120 is 150 mm, 200 mm, 250 mm, 300 mm, 350 mm, 400 mm, 450 mm or 500 mm.

Further, the receiving electrode 120 includes conductive metal; the shape of the receiving electrode 120 is a rod shape, a wire shape or a plate shape.

It should be noted that, when the shape of the receiving electrodes 120 is rod-like or filament-like, a plurality of receiving electrodes 120 are provided.

2 and 3 , in the illustrated embodiment, each row of nozzle bodies 131 is correspondingly provided with a wire-shaped or rod-shaped receiving electrode 120 .

Further, the length of the plate-shaped receiving electrode 120 is 100mm-4000mm, the width is 100mm-2000mm, and the thickness is 0.5mm-5mm.

Further, the length of the rod-shaped or filament-shaped receiving electrode 120 is 100mm-2000mm. Further optionally, the length of the rod-shaped or filament-shaped receiving electrode 120 is 200mm-1500mm. Illustratively, the rod-shaped or wire-shaped receiving electrodes 120 are 300 mm, 500 mm, 800 mm or 1000 mm in length.

Further, the diameter of the rod-shaped or filament-shaped receiving electrode 120 is 0.1 mm-100 mm. Further optionally, the diameter of the rod-shaped or filament-shaped receiving electrode 120 is 0.2 mm-90 mm. Illustratively, the diameter of the rod-shaped receiving electrode 120 is 20 mm, 30 mm, 40 mm, 50 mm, 60 mm, 70 mm, 80 mm or 90 mm. Illustratively, the diameter of the filamentary receiving electrode 120 is 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm or 1 mm.

Further, a high-voltage DC power supply 140 is provided in the needle-type vertical electrospinning device 100 for applying a voltage to the needle-type nozzle 130 and the receiving electrode 120 to form an electric field, so that the nanofibers ejected by the needle-type nozzle 130 The wire is adsorbed on the receiving substrate 150 at the receiving electrode 120 under the action of the electric field.

Further, the working voltage of the above-mentioned high-voltage DC power supply is 30kv-100kv, and the working current is 1ma-8ma. Further optionally, the working voltage of the above-mentioned high-voltage DC power supply is 35kv-95kv, and the working current is 2ma-7ma.

Further, the length of the positioning roller shaft 110 is 100mm-2000mm.

Further, the diameter of the positioning roller shaft 110 is 40mm-100mm. Further optionally, the diameter of the positioning roller shaft 110 is 50mm-90mm. Illustratively, the diameter of the positioning roller 110 is 50mm, 60mm, 70mm or 80mm.

Further, the surface of the positioning roller 110 is provided with an insulating high molecular polymer layer; the high molecular polymer is selected from any one of polytetrafluoroethylene, polyethylene, polypropylene, polyurethane, polyoxymethylene or nitrile rubber .

Further, the thickness of the insulating high molecular polymer layer is 5mm-10mm. Further optionally, the thickness of the insulating high molecular polymer layer is 6mm-9mm. Illustratively, the thickness of the insulating high molecular polymer layer is 6 mm, 7 mm, 8 mm or 9 mm.

Referring to FIG. 4 , some embodiments of the present application further provide an electrospinning system 200 , including the needle-type vertical electrospinning device 100 provided in any of the foregoing embodiments, and a winding and unwinding device. The rewinding and unwinding device cooperates with the positioning roller shaft 110 for transporting the receiving substrate.

In the illustrated embodiment, the above-mentioned rewinding and unwinding device includes an unwinding system 210 and a rewinding system 220 . The unwinding system 210 is arranged on the top of the casing 101, and the substrate receiving substrate is put into the casing 101 from the cloth opening on the top, and cooperates with the positioning roller 110 to transmit the receiving substrate. After the receiving substrate is attached to the nanofiber film , the receiving substrate is transferred to the take-up system 220 from the cloth outlet on the baffle 102 .

In some embodiments of the present application, the unwinding system 210 and the rewinding system 220 described above both include an inflatable shaft, a tension adjuster, a deviation correction system, a pneumatic system, and a motor. The receiving substrate is arranged on the inflatable shaft, and the unwinding system 210 and the winding system 220 are driven to rotate by a motor. And the tension of the receiving substrate is controlled by the tension regulator. Unwind system 210 continuously receives nanofibers to form large scale nanofiber membranes. After the direction of the receiving substrate is adjusted by the positioning roller 110 , the position is continuously adjusted by the action of the deviation correction system, and finally, it is wound and collected on the inflatable shaft of the winding system 220 .

Further, the range of the above-mentioned tension adjuster is 10kg-60kg. The length of the inflatable shaft is 500mm-2000mm. The diameter of the inflatable shaft is 50mm-120mm. Further optionally, the range of the above-mentioned tension adjuster is 20kg-50kg. The length of the inflatable shaft is 600mm-1800mm. Illustratively, the tension adjuster ranges described above are 20kg, 30kg, 40kg or 50kg. The length of the inflatable shaft is 600mm, 800mm, 1000mm or 1500mm.

The use process of the electrospinning system provided by the foregoing embodiments is exemplarily described below with reference to examples:

Implementation Example 1:

The needle-type spray head 130 includes a plurality of needle-type spray heads, each needle-type spray head has a diameter of 0.1 mm, and the interval between every two adjacent needle-type spray heads is 20 mm, and the multiple needle-type spray heads are staggered. The receiving electrode is made of stainless steel and has a plate-like structure with a size of 100mm*100mm and a thickness of 4mm. The receiving electrode connected to the high-voltage DC power supply is used to control the pulling direction of the nanofibers; the receiving substrate is made of non-woven fabric, with a width of 100mm and a gram weight of 100mm. The length of the positioning roller shaft 110 is 1200mm and the diameter is 40mm, the skin material is PTFE, and the thickness of the PTFE layer is 5mm; the length of the inflatable shaft is 500mm and the diameter is 50mm.

Using this needle-type nozzle vertical electrospinning device 100, the process of electrospinning and collecting includes:

Using a PVA solution with a mass fraction of 10%, connect the high voltage DC power supply to the needle nozzle 130 and the receiving electrode 120; the distance between the needle nozzle 130 and the receiving electrode 120 is 50mm, the needle voltage is 55kv, and the receiving electrode voltage is 30kv; receiving The moving speed of the substrate was 6 m/min. The included angle between the positioning roller shaft 110 and the plane where the inflatable shaft is located is 120°. The distance between the two positioning rollers 110 is 1200mm, and the tension adjuster is 10kg.

The results show that the needle-type vertical electrospinning device 100 operates stably. It can be seen from Figure 5 that the nanofiber membrane finally collected on the non-woven fabric is continuous and uniform without defects.

Implementation Example 2

The needle-type nozzle 130 includes a plurality of needle-type nozzles, each needle-type nozzle has a diameter of 0.3 mm, and the interval between every two adjacent needle-type nozzles is 20 mm, and the multiple needle-type nozzles are arranged in a staggered manner. The receiving electrode is made of aluminum and has a plate-like structure, with a size of 1500mm*500mm and a thickness of 15mm. The receiving electrode connected to the high-voltage DC power supply is used to control the pulling direction of the nanofibers; the receiving substrate is made of non-woven fabric, with a width of 1400mm and a gram weight. The length of the positioning roller shaft 110 is 1600mm and the diameter is 50mm, the skin material is polypropylene, and the thickness of the polypropylene layer is 10mm; the length of the inflatable shaft is 1000mm and the diameter is 50mm.

Using this needle-type nozzle vertical electrospinning device 100, the process of electrospinning and collecting includes:

Using a PVA solution with a mass fraction of 10%, connect the high-voltage DC power supply to the needle nozzle 130 and the receiving electrode 120; the distance between the needle nozzle 130 and the receiving electrode 120 is 500mm, the needle voltage is 80kv, and the receiving electrode voltage is 40kv; receiving The moving speed of the substrate is 5 m/min. The included angle between the positioning roller shaft 110 and the plane where the inflatable shaft is located is 120°. The distance between the two positioning rollers 110 is 1200mm, and the tension adjuster is 60kg.

The results show that the needle-type vertical electrospinning device 100 operates stably, and it can be seen from FIG. 5 that the nanofiber membrane finally collected on the non-woven fabric is continuous and uniform without defects.

Implementation Example 3

The needle-type spray head 130 includes a plurality of needle-type spray heads, each needle-type spray head has a diameter of 0.6 mm, and the interval between every two adjacent needle-type spray heads is 40 mm, and the multiple needle-type spray heads are staggered. The receiving electrode is made of aluminum material, with a filamentary structure, with a length of 1200mm and a diameter of 0.1mm. The receiving electrode connected to the high-voltage DC power supply is used to control the pulling direction of the nanofibers; the receiving substrate is made of meltblown cloth, with a width of 1000mm and a gram weight of 80g. ; The length of the positioning roller shaft 110 is 1300mm and the diameter is 60mm, the skin material is polyethylene, and the thickness of the polyethylene layer is 7mm; the length of the inflatable shaft is 1000mm and the diameter is 50mm.

Using this needle-type nozzle vertical electrospinning device 100, the process of electrospinning and collecting includes:

Using a PVA solution with a mass fraction of 10%, the high voltage DC power supply is connected to the needle-type nozzle 130 and the receiving electrode 120; the distance between the needle-type nozzle 130 and the receiving electrode 120 is 400mm, the nozzle voltage is 65kv, and the receiving electrode voltage is 40kv; the receiving substrate The movement speed is 6 m/min. The included angle between the positioning roller shaft 110 and the plane where the inflatable shaft is located is 120°. The distance between the two positioning rollers 110 is 1200mm, and the tension adjuster is 60kg.

The results show that the needle-type vertical electrospinning device 100 operates stably, and it can be seen from FIG. 5 that the nanofiber film finally collected on the melt-blown cloth is continuous, uniform and defect-free.

Implementation Example 4

The needle-type nozzle 130 includes a plurality of needle-type nozzles, each needle-type nozzle has an aperture of 1 mm, and the interval between each adjacent two needle-type nozzles is 50 mm, and the multiple needle-type nozzles are arranged in a staggered manner. The receiving electrode is made of aluminum and has a rod-like structure with a length of 2000mm and a diameter of 100mm. The receiving electrode connected to the high-voltage DC power supply is used to control the pulling direction of the nanofibers; the receiving substrate is made of non-woven fabric, with a width of 1800mm and a gram weight of 100g; positioning The length of the roller shaft 110 is 2000mm and the diameter is 100mm, the skin material is PTFE, and the thickness of the PTFE layer is 10mm; the length of the inflatable shaft is 2000mm and the diameter is 120mm.

Using this needle-type nozzle vertical electrospinning device 100, the process of electrospinning and collecting includes:

Using a PVA solution with a mass fraction of 10%, connect the high voltage DC power supply to the needle nozzle 130 and the receiving electrode 120; the distance between the needle nozzle 130 and the receiving electrode 120 is 600mm, the needle voltage is 100kv, and the receiving electrode voltage is 100kv; receiving The moving speed of the substrate was 6 m/min. The included angle between the positioning roller shaft 110 and the plane where the inflatable shaft is located is 120°. The distance between the two positioning rollers 110 is 1200mm, and the tension adjuster is 60kg.

The results show that the needle-type vertical electrospinning device 100 operates stably, and it can be seen from FIG. 5 that the nanofiber membrane finally collected on the non-woven fabric is continuous and uniform without defects.

In conclusion, the needle-type nozzle vertical electrospinning device 100 of the present application can make the distribution of nanofiber membranes more uniform, and solve the problems of uneven membrane surface and long-distance sagging of membrane surface in the traditional horizontal spinning collection process. The number of rollers can be reduced, and at the same time, the surface of the fiber film is not in contact with the rollers, which effectively solves the problem of sticking of nanofibers. In addition, the tension of the receiving substrate can be reduced and a lower strength receiving substrate can be used for collection. Greatly improve the spinning efficiency and spinning quality.

The electrospinning device of the present application has the advantages of simple structure, low cost, flexible and convenient operation and the like. There is no need to modify other components of the electrospinning equipment, and it can be flexibly adjusted according to the actual application, which can significantly reduce the maintenance difficulty and maintenance cost of the equipment.

The above descriptions are only preferred embodiments of the present application, and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this application shall be included within the protection scope of this application.

Claims (10)

1. A vertical electrostatic spinning device of a needle type spray head is characterized by comprising:

a positioning roller for transferring and positioning the receiving substrate; the positioning roll shafts comprise at least two;

the receiving electrode is arranged between the two positioning roller shafts along the vertical direction, is positioned outside the receiving substrate and is parallel to the receiving substrate; and

and the needle type spray heads are arranged on the other side of the receiving substrate and are arranged along the vertical direction, and the filament outlet direction of the needle type spray heads is vertical to the receiving substrate.

2. The needle-jet vertical electrospinning device of claim 1,

the needle type spray head is used as a spinning electrode and is connected with an electric property opposite to that of the receiving electrode; the needle type sprayer comprises a plurality of sprayer bodies which are regularly arranged along the vertical direction, and two adjacent rows of the sprayer bodies are arranged in a staggered mode.

3. The needle-jet vertical electrospinning device of claim 2,

the aperture of each spray head body is 0.1mm-1 mm; the distance between two adjacent spray head bodies in each row is 20mm-50 mm.

4. The needle-jet vertical electrospinning device of claim 1,

the horizontal distance between the needle type spray head and the receiving electrode is 50mm-600 mm.

5. The needle-jet vertical electrospinning device of claim 1,

the receiving electrode comprises a conductive metal; the receiving electrode is in a rod shape, a wire shape or a plate shape; the rod-shaped or wire-shaped electrode is kept parallel to the horizontal plane when placed, and the plate-shaped electrode is kept vertical to the horizontal plane when placed.

6. The needle-jet vertical electrospinning device of claim 5,

the length of the platy receiving electrode is 100mm-4000mm, and the width of the platy receiving electrode is 100mm-2000 mm; the thickness is 0.5mm-5 mm;

the length of the rod-shaped or wire-shaped receiving electrode is 100mm-2000mm, and the diameter of the rod-shaped or wire-shaped receiving electrode is 0.1mm-100 mm.

7. The needle-jet vertical electrospinning device of claim 1,

the positioning roll shafts comprise two, and the receiving electrodes are vertically arranged between the two positioning roll shafts.

8. The needle-jet vertical electrospinning device of claim 7,

the length of the positioning roll shaft is 100mm-2000 mm; the diameter of the positioning roll shaft is 40mm-100 mm.

9. The needle-jet vertical electrospinning device of claim 7,

an insulating high polymer layer is arranged on the surface of the positioning roller shaft; the high molecular polymer is selected from any one of polytetrafluoroethylene, polyethylene, polypropylene, polyurethane, polyoxymethylene oxide or nitrile rubber;

the thickness of the insulating high polymer layer is 5mm-10 mm.

10. A needle-type nozzle vertical electrostatic spinning system is characterized by comprising the needle-type nozzle vertical electrostatic spinning device according to any one of claims 1 to 9; and

and the winding and unwinding device is matched with the positioning roller shaft and is used for transmitting the receiving substrate.

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