CN102704192A - Production device for multi-roll solid-pin electrode nanofiber non-woven fabrics - Google Patents

Abstract

The invention discloses a multi-roller solid needle electrode nanofiber nonwoven fabric production device. The production device mainly includes: a liquid storage tank, a liquid transfer roller, a solid needle electrode spinneret roller, a receiving device, and a high-voltage electrostatic generator; Liquid roller 2 is made of polypropylene resin, wrapped with fluorine rubber on the outside, with a width of 20-200cm and a radius of 5-50cm; 3-20 cm; the density of the solid needle electrode 22 is 1-16 needles/cm ² ; the solid needle electrode is characterized in that its needle-shaped structure is fork-shaped, cylindrical, prism-shaped, conical-shaped, and pyramid-shaped etc.; the solid needle electrode 22 is characterized in that the needle length is 1-4 cm, and the distance between the needle tip and the surface of the liquid-carrying roller is 0.1-1 mm. The production device of the present invention is capable of producing spinning liquid electrospun nanofibers with a concentration as high as 25%, and its critical voltage is usually not higher than 25kV, its production efficiency can be above 20g/min, and the diameter of the prepared nanofibers ranges from 50 to 500nm , with an average diameter of less than 400nm.

Description

A multi-roller solid needle electrode nanofiber nonwoven fabric production device

technical field

The invention relates to an electrostatic spinning device, in particular to a multi-roller solid needle electrode nanofiber nonwoven fabric production device.

Background technique

In a narrow sense, nanofibers refer to fibers with a diameter less than 100nm. Due to their extremely fine diameter, the specific surface area of the fibers has undergone a qualitative leap, which greatly improves their surface energy, thus endowing them with special small size effects, surface effects, Quantum size effect, macroscopic quantum tunneling effect, etc., all exhibit excellent properties in terms of physical (light, heat, electromagnetic, etc.), chemical and other properties, and will become research hotspots in the 21st century in the future. Nanofiber nonwovens have broad application prospects in environmental protection filter materials, nanocomposite reinforcement materials, tissue engineering scaffolds, drug release carriers, photoelectric devices, and catalytic materials.

Electrospinning is currently one of the most effective technologies for preparing nanofiber nonwovens, which was first invented by American Formhals in 1934 [A.FORMHALS.Process and apparatus for preparing artificial threads: USA, 1975504[P]1934.] , the core of which is that the polymer solution or melt under the action of the high-voltage electrostatic field force produces a jet jet, and the jet-like spinning stream will undergo a "disturbance phenomenon" in the air and split into many finer fiber streams. Continuous stretching and thinning, at the same time, the solvent in the trickle is volatilized (or the melt is cooled in a trickle), and the fiber is solidified and formed, and is accepted by the collecting device to obtain a nanofiber nonwoven fabric. The types of electrospinning include solution electrospinning and melt electrospinning. Among them, solution electrospinning has developed rapidly due to its simple equipment and process.

The solution electrospinning machine or device mainly includes four main parts: spinneret, spinning solution supply system, high voltage generator and fiber collecting plate. The traditional electrospinning machine uses a single metal capillary needle as the spinneret, such as the technologies disclosed in Chinese patents 200420020596.3, 200410025622.6, 200420107832.5, etc., and the technologies disclosed in US patents US6753454, US6656394, and US6713011.

As electrospun nanofiber nonwovens are increasingly valued by the industry, the traditional single-needle electrospinning machine cannot meet the needs of large-scale applications due to its low yield, which has become a bottleneck restricting its further development. Improving the output of electrospun nanofibers has become a common concern and problem faced by experts and scholars.

On the basis of the single-needle electrospinning device, many scholars have developed a multi-needle electrospinning device. Theron et al. [S.A.THERON, A.L.YARIN, E. ZUSSMAN, E.KROLL. Multiple jets in electrospinning: experiment and modeling. Polymer, 2005, 46(9): 2889-2899.], many similar patents have also appeared in the world, such as WO2005/073441 1, WO 2004/016839 A1 , USA6,382,526, USA, 6,616,435B2, etc. Although the multi-needle electrospinning technology has greatly improved the output, and the mutual interference between multiple needles can be reduced by rationally arranging the positions of the needles. However, in the spinning process of thousands of needles, once one or more needles are blocked or dripping, it will seriously affect the uniformity and quality of the product, and the cleaning work is cumbersome, affecting production.

In 2004, the rotary-roller electrospinning technology manufactured by ELMARCO in the Czech Republic pioneered the needle-free electrospinning technology and applied for a patent (WO2005/024101 A1). The main principle of this technology is to install a rotating metal roller shaft partially immersed in the solution (or engraved with different patterns) in the liquid storage tank. The spinning solution is brought to the surface of the roller shaft with the rotation of the roller shaft. A high-voltage static electricity is applied on the surface, and under the action of the electric field force, the spinning solution on the surface of the roller shaft forms multiple jets, which spread all over the length of the roller, so a higher output can be obtained. The output of this equipment can reach 1-15g/min, and the fiber diameter is about 100-1000nm, laying a solid foundation for the realization of the goal of industrialized production of nanofibers. Since the spinning and spinning area is on the surface of the roller, the traditional capillary metal needle tube is not used, so it is called a needle-free electrospinning machine. Compared with needle electrospinning, since the fiber jetting direction is upward, it avoids the generation of droplets and has a higher yield. However, the needle-free roller-type electrospinning equipment needs higher high-voltage static electricity than the needle-type spinning machine in the spinning process, and its starting voltage (the voltage value when the spinning solution forms a Taylor cone) is usually above 40kV. The reason is that the surface curvature of the roller shaft is large, the electric field is not concentrated on its surface, and when the roller shaft rotates, there is a lot of liquid on its surface, so a higher voltage is needed to overcome the surface tension of the spinning solution and form a Taylor cone; In addition, the fiber diameter of roller-type needle-free electrospinning is thicker than that of needle-type electrospun fibers, generally above 300nm, and some even exceed 1μm; moreover, excessive voltage value will cause breakdown and leakage, which will damage the insulation of equipment. The higher the requirements, the corresponding increase in spinning energy consumption. Other patents related to the needleless roller-type electrospinning device include: Chinese patents 200410025622.6, 200610036635.2, 200710036447.4, 200810032247.6, etc.

From the perspective of spinning technology, increasing the concentration of spinning solution also helps to increase the yield of electrospun nanofibers to a certain extent, and can reduce the amount of solvent used, production costs and environmental pollution. However, the greater the solubility of the spinning solution, the greater its viscosity. It is difficult to squeeze out the high-concentration spinning solution in the capillary needle, which will accelerate the clogging of the injection head; the excessive amount of liquid on the surface of the needle-free roller will cause spinning Difficult, if not impossible, electrospinning. So far, there are few literature and patent reports on electrospinning devices suitable for high-concentration spinning solutions.

Contents of the invention

Aiming at the deficiencies of the prior art, the technical problem to be solved by the present invention is to provide a multi-roller solid needle electrode nanofiber nonwoven fabric industrial production device. The production device is specially designed with a solid needle electrode spinneret roller, which solves the problem of clogging and dripping in the capillary needle electrospinning process and the high spinning voltage and thick fiber diameter in the needleless roller spinning process. The problem of overcoming the technical difficulties of electrospinning nanofibers in high-concentration spinning solutions.

The technical solution of the present invention to solve the technical problems of the production device is: to design a multi-roller solid needle electrode nanofiber nonwoven industrial production device, the production device mainly includes: a liquid storage tank 1, a liquid transfer roller 2, a solid needle electrode Spinning roller 3, receiving device 4, high voltage electrostatic generator 5.

The liquid-carrying roller 2 designed by the present invention is characterized in that its material is a kind of in plastics or rubber roller.

The solid needle electrode spinneret roll 3 designed by the present invention is characterized in that the spinneret roll is composed of a metal shaft 31 and a solid needle electrode 32; the solid needle electrode 32 is characterized in that its needle-shaped structure is fork-shaped, cylindrical , prism, cone, pyramid, etc.; the solid needle electrode 32 is closely connected with the metal shaft 31.

Compared with the existing electrospinning device, the multi-roller solid needle electrode nanofiber nonwoven industrial production device designed by the present invention uses the transfer roller 2 to evenly transfer the spinning solution in the liquid storage pool to its surface, and then The appearance of the needle tip of the solid needle electrode 32 transferred to the solid needle electrode spinner roll 3 effectively solves the pinhole clogging phenomenon of the existing capillary needle electrospinning; at the same time, due to the transition of the spinning solution through the liquid transfer roller 2, it can make The needle tip of the solid needle electrode 32 has a uniform liquid volume. What is more prominent is that the electric field at the needle tip in this electrospinning device is the most concentrated and the electric field intensity is the largest, which helps to form a stable Taylor cone jet and greatly reduces the spinning voltage. , which can meet the batch preparation of electrospun nanofibers with high concentration spinning solution. In addition, the production device is also suitable for low-solubility spinning solutions.

Description of drawings

Fig. 1 is the overall structure schematic diagram of an embodiment of the double-roller solid needle electrode nanofiber production device of the present invention;

Fig. 2 is the overall structure schematic diagram of an embodiment of the three-roller solid needle electrode nanofiber production device of the present invention;

Fig. 3 is a structural schematic diagram of a solid electrode spinneret roll of an embodiment of the solid needle electrode nanofiber production device of the present invention;

Fig. 4 is a schematic diagram of a fork-shaped solid needle electrode of the present invention;

Fig. 5 is a schematic diagram of a cylindrical solid needle electrode of the present invention;

Fig. 6 is a schematic diagram of a conical solid needle electrode of the present invention;

Fig. 7 is a schematic diagram of a triangular pyramid-shaped solid needle electrode of the present invention.

Detailed ways

The present invention will be further described below in conjunction with the embodiments and accompanying drawings, but the scope of the claims of the present invention is not limited by the specific embodiments.

The multi-roller solid needle electrode nanofiber nonwoven production device (abbreviation device, referring to Fig. 1, 2) of the present invention design comprises liquid storage pool 1, and liquid transfer roller 2 is housed on the liquid storage pool 1, and the surface of liquid transfer roller 2 is provided with There are one or more solid needle electrode spinning rollers 3, and a receiving device 4 is installed directly above the solid needle electrode spinning rollers 3; the solid needle electrode spinning rollers 3 are made up of metal shafts 31 and solid needle electrodes 32; The solid needle electrode spinneret roll 3 is connected with the positive pole 51 of the high-voltage electrostatic generator 5 through a metal shaft 31; The negative pole 52 is connected to the ground plate 42 in the receiving device 4 and the ground wire.

The material of the liquid storage pool 1 is polyethylene resin with super molecular weight, which has extremely high strength and modulus, and at the same time has good electrical insulation, resistance to organic solvents, strong acids, strong alkalis and excellent welding processing characteristics; the said The liquid storage tank 1 is designed with a liquid inlet 11 and a liquid outlet 12. During the electrospinning process, the spinning liquid is continuously replenished from the liquid inlet 11 to ensure that the spinning liquid level is flush with the liquid outlet 12. Its function is to control The amount of liquid carried during the rotation of the liquid transfer roller 2 is stable.

The material of the liquid transfer roller 2 is polypropylene resin, and the surface is wrapped with fluorine rubber. Both polypropylene resin and fluororubber have excellent acid and alkali resistance, organic solvent resistance and good electrical insulation; the size of the liquid-carrying roller 2 can be designed, and the width range is 20-200cm, preferably 100-150cm. 5 to 50 cm, preferably 20 to 30 cm.

The present invention specially designs a kind of solid needle electrode spinneret roll 3, and described solid electrode spinneret roll 3 is made up of metal shaft 31 and solid needle electrode 32 (referring to Fig. 3); Described metal shaft can be hollow shaft, also can be The solid shaft, the hollow shaft is preferred, and the hollow shaft is more helpful for the high-voltage direct current generated by the high-voltage electrostatic generator 5 to be transmitted to the solid needle electrode 32 and its surface spinning solution; the material of the metal shaft 31 and the solid needle electrode 32 can be gold or copper , iron and other conductive metals, preferably copper.

The width of the solid needle electrode spinneret roller 3 is consistent with that of the liquid-carrying roller, and the radius (distance from the tip of the solid needle to the axis center) ranges from 3 to 20 cm, preferably 5 to 10 cm; the density of the solid needle electrodes 22 is 1 ~16 needles/cm ² , preferably 4-8 needles/cm ² . The larger the radius of the spinneret roll 3, the higher the density of needle planting, the larger the number of jets formed, and the higher the output, but the required voltage is relatively high.

The solid needle electrode 32 is characterized in that the needle-shaped structure is one of fork-shaped, cylindrical, conical, pyramid-shaped, etc. (with reference to Figures 4, 5, and 6), and the fork-shaped structure is preferably selected; the solid needle electrode 32, characterized in that the needle length is 1-4 cm, preferably 2-3 cm, and the distance between the tip of the solid needle and the surface of the transfer roller is 0.1-1 mm. The closer the needle tip is to the surface of the liquid transfer roller, the more spinning solution the solid needle electrode tip carries, the production efficiency will increase slightly, and the voltage required is also high.

The receiving device 4 includes a non-porous mesh curtain 41 and a grounding plate 42. The surface of the non-porous mesh curtain 41 is plated with a dense metal silver film layer, and the effect of the coating is to accelerate the dissipation of surface charges in the nanofibers; the grounding Plate 42 is grounded.

The high-voltage electrostatic generator 5 is a known commercially available high-voltage DC power supply with a voltage range of 0 to 100 kV; the positive pole 51 of the high-voltage electrostatic generator 5 is connected to the metal shaft 31 of the solid needle electrode spinneret roll 3, and the negative pole 52 is grounded. The function of the high-voltage electrostatic generator is to charge the spinning liquid on the surface of the solid needle with high voltage, and form a high-voltage electrostatic field with the grounding plate 42, so that the spinning liquid is drawn and refined into nanofibers under the action of a high-voltage electric field.

The basic working principle of the device of the present invention is: the spinning liquid is injected into the liquid storage tank 1 through the liquid inlet 11, and the liquid transfer roller 2 installed on the liquid storage tank rotates at a speed of 1 to 30 r/min under the drive of external force. The rotation of the liquid roller 2 causes a certain amount of spinning liquid to be carried on the surface of the fluorine rubber. At this time, the solid needle electrode spinneret roller 3 also rotates at a certain speed, and the rotation speed is 1 ~ 10r/min. The solid needle electrode 32 and the After the spinning liquid on the surface of the liquid transfer roller 2 is contacted, the needle point is covered with a uniform spinning liquid; the solid needle electrode 32 is connected to the positive electrode 51 of the high-voltage electrostatic generator 5 through the metal shaft 31, and the direct current generated by the high-voltage electrostatic generator 5 The high voltage (15-60kV) is transmitted to the droplet on the surface of the needle tip of the solid needle electrode 32 through the metal shaft, and forms a high-voltage electric field with the ground plate 42 in the receiving device 4 (the distance between the two is adjustable from 10 to 25 cm), In this way, the droplets on the needle tip surface of the solid needle electrode 32 form a large number of Taylor cones under the action of the electric field, thereby generating a large number of fiber jets. Under the action of a high-voltage electrostatic field, the jet flow undergoes processes such as acceleration, disturbance, and splitting, and then becomes thinner, and is cooled in the air or the solvent is volatilized to form, and finally deposited on the receiving device 4 in the form of nanofibers, forming a uniform distribution. , Nanofiber nonwovens with an average diameter of 50-500nm and a width of 20-200cm.

Compared with the existing multi-needle electrospinning machine and needleless roller electrospinning machine, the specially designed solid needle electrode spinning roller of the present invention can handle the concentration up to 25% due to the droplet on the surface of the solid needle electrode 22. The above spinning solution is used for electrospun nanofiber production, and its critical voltage is usually not higher than 25kV, and its production efficiency can be above 20g/min. The diameter of the prepared nanofibers ranges from 50 to 500nm, and the average diameter is less than 400nm.

What is not mentioned in the present invention is applicable to the prior art.

Example 1

As shown in Figure 1, a double-roller solid needle electrode nanofiber production device includes a liquid storage tank 1, a liquid transfer roller 2, a solid needle electrode spinneret roller 3, a receiving device 4, and a high-voltage electrostatic generator 5. The width of the liquid transfer roller 2 is 20cm, and the radius is 5cm. The radius of the solid needle electrode spinneret roll 3 (the solid needle tip distance from the center of the shaft) is 5cm, and the fork-shaped solid needle electrode as shown in Figure 4 is selected. The length of 32 solid needle electrodes is 1 cm, the width of fork is 0.5 mm, the density of needle implantation is 6 needles/cm ² , and the distance between the needle tip and the surface of fluororubber with liquid roller 3 is 0.5 mm. During work, 30% polyvinyl alcohol/water spinning solution is injected into the liquid storage tank 1 through the liquid inlet 11, and the excess spinning solution flows out through the outlet 12, and the liquid transfer roller 2 is driven by an external force at a rotational speed of 15 r/min Rotate, the rotation speed of the solid needle electrode spinneret roll 3 is 3r/min, after the spinneret roll 3 rotates stably, turn on the high-voltage electrostatic generator 5, the positive electrode 51 of the high-voltage electrostatic generator 5 and the metal shaft of the solid needle electrode spinneret roll 3 31 connected to each other, output 40kV DC high-voltage static electricity, a receiving device 4 is arranged directly above the multi-needle spinneret 3, and the distance between the two is set to be 18cm; at this time, between the multi-needle spinneret 3 and the receiving device A high-voltage electrostatic field is formed between the grounding plates 42 of 4, and the spinning solution on the tip of the solid needle 31 generates a large number of jet jets under the action of static electricity, and the jets undergo processes such as acceleration, disturbance, and splitting, and become thinner and thinner continuously. Cooling and forming in air, and finally depositing on the receiving device 4 in the form of nanofibers, the average diameter of the produced nanofibers is about 40-160nm, the average diameter is about 80nm, and the production rate is about 30g/min. The starting voltage of the solution system is 20kV.

Example 2

As shown in Figure 1, a double-roller solid needle electrode nanofiber production device includes a liquid storage tank 1, a liquid transfer roller 2, a solid needle electrode spinneret roller 3, a receiving device 4, and a high-voltage electrostatic generator 5. The width of the liquid transfer roller 2 is 200cm, and the radius is 50cm. The radius of the solid needle electrode spinneret roll 3 (the solid needle tip distance from the axis) is 20cm, and the cylindrical solid needle electrode as shown in Figure 5 is selected. The length of 32 solid needle electrodes is 4cm, the density of needle planting is 16 needles/cm ² , and the distance between the needle tip and the surface of the fluorine rubber of the transfer roller 3 is 1mm. During work, 6% polyvinylpyrrolidone/ethanol spinning solution is injected into the liquid storage tank 1 through the liquid inlet 11, the excess spinning solution flows out through the outlet 12, and the liquid transfer roller 2 is driven by an external force at a rotation speed of 30r/min Rotate, the rotation speed of the solid needle electrode spinneret roll 3 is 10r/min, after the spinneret roll 3 rotates stably, open the high-voltage electrostatic generator 5, the positive electrode 51 of the high-voltage electrostatic generator 5 and the metal shaft of the solid needle electrode spinneret roll 3 31 is connected, the DC high-voltage static electricity of output 15kV is provided with the receiving device 4 of grounding directly above the multi-needle spinneret 3, and the distance between setting the two is 25cm; A high-voltage electrostatic field is formed between the grounding plates 42 of the receiving device 4, and the spinning solution on the tip of the solid needle 31 generates a large number of jets under the action of static electricity, and the jets undergo processes such as acceleration, disturbance, and splitting, and become thinner continuously. , and cooled in air to shape, and finally deposited on the receiving device 4 in the form of nanofibers, the average diameter of the produced nanofibers is about 120-380nm, the average diameter is about 210nm, and the production rate is about 180g/min. The starting voltage of the solution system is 15kV.

Example 3

As shown in Figure 1, a double-roller solid needle electrode nanofiber production device includes a liquid storage tank 1, a liquid transfer roller 2, a solid needle electrode spinneret roller 3, a receiving device 4, and a high-voltage electrostatic generator 5. The width of the liquid transfer roller 2 is 100cm, and the radius is 20cm. The radius of the solid needle electrode spinneret roll 3 (the solid needle tip distance from the axis) is 10cm, and the conical solid needle electrode as shown in Figure 6 is selected. The length of 32 solid needle electrodes is 2cm, the density of needle implantation is 16 needles/cm ² , and the distance between the needle tip and the surface of the fluorine rubber of the transfer roller 2 is 0.5mm. During work, 25% polyurethane/N,N-dimethylformamide spinning solution is injected into the liquid storage tank 1 through the liquid inlet 11, and the excess spinning solution flows out through the outlet 12, and the liquid transfer roller 2 is driven by an external force Rotate with 25r/min rotation speed, solid needle electrode spinneret roll 3 rotation speed is 5r/min, after spinneret roll 3 rotates stably, open high-voltage electrostatic generator 5, high-voltage electrostatic generator 5 positive electrode 51 and solid needle electrode spray The metal shaft 31 of the wire roller 3 is connected to each other, and the DC high-voltage static electricity of output 30kV is provided with a receiving device 4 directly above the multi-needle spinneret roller 3, and the distance between the two is set to be 20cm; A high-voltage electrostatic field is formed between the wire roller 3 and the grounding plate 42 of the receiving device 4, and the spinning liquid on the tip of the solid needle 31 generates a large number of jets under the action of static electricity, and the jets undergo processes such as acceleration, disturbance, and splitting. , continuously thinning, and cooled in the air to form, and finally deposited on the receiving device 4 in the form of nanofibers. The average diameter of the produced nanofibers is about 90-190nm, the average diameter is about 130nm, and the production rate is about 90g/min . The starting voltage of the solution system is 15kV.

Example 4

A three-roller solid needle electrode nanofiber production device as shown in Figure 2 includes a liquid storage tank 1, a liquid transfer roller 2, a solid needle electrode spinneret roller 3, a receiving device 4, and a high-voltage electrostatic generator 5. The width of the liquid-carrying roller 2 is 80 cm, and the radius is 10 cm. The radius of the solid needle electrode spinneret roll 3 (the distance between the tip of the solid needle and the center of the axis) is 2 cm, and the triangular pyramid-shaped solid needle electrode as shown in Figure 7 is selected. , 32 solid needle electrodes with a length of 3 cm, a needle density of 8 needles/cm ² , and a distance of 0.8 mm between the needle tip and the surface of the liquid-filled roller 2 of fluororubber. When working, inject 30% polylactic acid/1,2-dichloroethane spinning liquid into the liquid storage tank 1 through the liquid inlet 11, and the excess spinning liquid flows out through the outlet 12, and the liquid transfer roller 2 is driven by an external force Rotate at a rotational speed of 10r/min, the rotational speed of the solid needle electrode spinneret roll 3 is 3r/min, turn on the high-voltage electrostatic generator 5 after the spinneret roll 3 rotates stably, and the positive electrode 51 of the high-voltage electrostatic generator 5 is sprayed with the solid needle electrode. The metal shaft 31 of the wire roller 3 is connected to each other, and the DC high-voltage static electricity of 35kV is output, and a receiving device 4 is provided directly above the multi-needle spinneret roller 3, and the distance between the two is set to be 15cm; A high-voltage electrostatic field is formed between the wire roller 3 and the grounding plate 42 of the receiving device 4, and the spinning liquid on the tip of the solid needle 31 generates a large number of jets under the action of static electricity, and the jets undergo processes such as acceleration, disturbance, and splitting. , continuously thinner, and cooled in the air to shape, and finally deposited on the receiving device 4 in the form of nanofibers. The average diameter of the produced nanofibers is about 180-380nm, the average diameter is about 230nm, and the production rate is about 160g/min . The starting voltage of the solution system is 20kV.

Example 5

A three-roller solid needle electrode nanofiber production device as shown in Figure 2 includes a liquid storage tank 1, a liquid transfer roller 2, a solid needle electrode spinneret roller 3, a receiving device 4, and a high-voltage electrostatic generator 5. The width of the liquid transfer roller 2 is 40cm, and the radius is 20cm. The radius of the solid needle electrode spinneret roll 3 (the distance between the tip of the solid needle and the center of the axis) is 5cm, and the triangular pyramidal solid needle electrode as shown in Figure 4 is selected. , the length of 32 solid needle electrodes is 1 cm, the density of needle implantation is 3 needles/cm ² , and the distance between the needle tip and the surface of the fluorine rubber of the transfer roller 2 is 0.6 mm. During work, 28% polyurethane/polyacrylonitrile/N, N-dimethylformamide spinning liquid is injected in the liquid reservoir 1 by liquid inlet 11, and excessive spinning liquid flows out through outlet 12, and liquid transfer roller 2 Rotate with 16r/min rotational speed under the drive of external force, solid needle electrode spinneret roll 3 rotational speed is 8r/min, after spinneret roll 3 rotates stably, open high-voltage electrostatic generator 5, high-voltage electrostatic generator 5 positive electrode 51 and The metal shaft 31 of the solid needle electrode spinneret 3 is connected to each other, and the DC high-voltage static electricity of 35kV is output, and a receiving device 4 is arranged directly above the multi-needle spinneret 3, and the distance between the two is set to be 18cm; at this time, A high-voltage electrostatic field is formed between the multi-needle spinner roll 3 and the grounding plate 42 of the receiving device 4, and the spinning liquid on the tip of the solid needle 31 generates a large amount of jet jets under the action of static electricity, and the jets experience acceleration and disturbance. , splitting and other processes, continuously thinning, and cooling and forming in the air, and finally deposited on the receiving device 4 in the form of nanofibers. The average diameter of the produced nanofibers is about 180-380nm, the average diameter is about 230nm, and the yield is about It is 250g/min. The starting voltage of the solution system is 19kV.

Example 6

A three-roller solid needle electrode nanofiber production device as shown in Figure 2 includes a liquid storage tank 1, a liquid transfer roller 2, a solid needle electrode spinneret roller 3, a receiving device 4, a high-voltage electrostatic generator 5 and a connector. The width of the liquid transfer roller 2 is 120 cm, and the radius is 10 cm. The radius of the solid needle electrode spinneret roll 3 (the distance between the tip of the solid needle and the center of the axis) is 3 cm, and the fork-shaped solid needle electrode shown in 3 is selected. The length of needle electrode 32 is 1 cm, the density of needle implantation is 1 needle/cm ² , and the distance between the needle tip and the surface of fluorine rubber of transfer roller 2 is 0.1 mm. When working, inject 50% aluminum salt sol-gel spinning liquid into the liquid storage tank 1 through the liquid inlet 11, the excess spinning liquid flows out through the outlet 12, and the liquid transfer roller 2 is driven by an external force at a rotation speed of 1r/min Rotate, the rotation speed of the solid needle electrode spinneret roll 3 is 1r/min, after the spinneret roll 3 rotates stably, turn on the high-voltage electrostatic generator 5, the positive electrode 51 of the high-voltage electrostatic generator 5 and the metal shaft of the solid needle electrode spinneret roll 3 31 connected to each other, output 45kV DC high-voltage static electricity, a receiving device 4 is provided on the E side of the multi-needle spinneret 3, and the distance between the two is set to be 23cm; at this time, between the multi-needle spinneret 3 and the receiving device A high-voltage electrostatic field is formed between the grounding plates 42 of 4, and the spinning solution on the tip of the solid needle 31 generates a large number of jet jets under the action of static electricity, and the jets undergo processes such as acceleration, disturbance, and splitting, and become thinner and thinner continuously. Cooling and forming in air, and finally depositing on the receiving device 4 in the form of nanofibers, the average diameter of the produced nanofibers is about 280-480nm, the average diameter is about 360nm, and the production rate is about 40g/min. The starting voltage of the solution system is 25kV.

Example 7

A three-roller solid needle electrode nanofiber production device as shown in Figure 2 includes a liquid storage tank 1, a liquid transfer roller 2, a solid needle electrode spinneret roller 3, a receiving device 4, and a high-voltage electrostatic generator 5. The width of the liquid transfer roller 2 is 200cm, and the radius is 50cm. The radius of the solid needle electrode spinneret roll 3 (the distance from the tip of the solid needle to the center of the shaft) is 3cm. The fork-shaped solid needle electrode shown in 3 is selected. The 32 needles of the needle electrode are 1 cm long, the needle implantation density is 16 needles/cm ² , and the distance between the needle tip and the surface of the fluorine rubber of the transfer roller 2 is 0.1 mm. When working, inject 5% polyvinylpyrrolidone/L alcohol spinning solution into the liquid storage tank 1 through the liquid inlet 11, the excess spinning solution flows out through the outlet 12, and the liquid transfer roller 2 rotates at 15r/min under the drive of external force Speed rotation, the solid needle electrode spinneret roll 3 rotation speed is 15r/min, after the spinneret roll 3 rotates stably, open the high-voltage electrostatic generator 5, the metal of the high-voltage electrostatic generator 5 positive electrode 51 and the solid needle electrode spinneret roll 3 Shaft 31 links to each other, the DC high-voltage static electricity of output 40kV, is provided with receiving device 4 directly above multi-needle spinneret 3, sets the distance between the two as 20cm; A high-voltage electrostatic field is formed between the grounding plates 42 of the device 4, and the spinning solution on the tip of the solid needle 31 generates a large number of jet jets under the action of static electricity, and the jets undergo processes such as acceleration, disturbance, and splitting, and become thinner continuously. And cooled in the air to shape, and finally deposited on the receiving device 4 in the form of nanofibers, the average diameter of the produced nanofibers is about 60-120nm, the average diameter is about 90nm, and the production rate is about 20g/min. The starting voltage of the solution system is 15kV.

Claims (4)

1. multiple roll solid needle electrode nano fibre nonwoven production apparatus, this process units mainly comprises: liquid storage tank, change liquid roller, solid needle electrode spray roll dies, receiving system, HV generator.

2. be acrylic resin according to the said roller with liquid material of claim 1, the appearance looping has fluorubber, and fabric width is 20～200cm, and radius is 5～50cm.

3. according to the said solid needle electrode spray of claim 1 roll dies, it is characterized in that being made up of metal shaft and solid needle electrode, fabric width and roller with liquid are consistent, and radius is 3～20cm;

Described solid needle electrode bestock is 1～16 pin/cm ²

4. according to claim 1 or 3 said solid needle electrodes, be characterised in that its aciculiform structure is a kind of in fork-shaped, cylindrical, prismatic, conical, pyramid etc.; Said solid needle electrode is characterized in that the long 1～4cm of pin, and needle point and roller with liquid fluorubber surface distance are 0.1～1mm.

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