CN103451750A - Electrostatic spinning device and method for manufacturing hollow nanometer fiber - Google Patents
Electrostatic spinning device and method for manufacturing hollow nanometer fiber Download PDFInfo
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Abstract
The invention discloses an electrostatic spinning device and a method for manufacturing hollow nanometer fiber and belongs to the field of a textile industry. The device comprises a high-voltage static generator electrically connected with a coaxial composite sprayer with two liquid inlets and one composite sprayer. A receiving electrode plate is connected with the ground. The coaxial composite sprayer is opposite to the grounded receiving electrode plate, and a certain gap is reserved between the coaxial composite sprayer and the receiving electrode plate. An automatic liquid supplying device is connected with all liquid inlets of the coaxial composite sprayer, a winding device is arranged between the coaxial composite sprayer and the receiving electrode plate, and base cloth or a fiber curtain conveyed on the winding device penetrates an area between the coaxial composite sprayer and the receiving electrode plate.
Description
Technical Field
The invention relates to the field of textile industry, in particular to electrostatic spinning equipment and a method for preparing nano fibers.
Background
The hollow nano-fiber has wide application prospect in many aspects such as drug release, tissue scaffold, catalysis, spinning and the like.
At present, the preparation of the hollow nano fiber mainly comprises a self-assembly method and a template method. The hollow nano fiber prepared by the self-assembly method is obtained by self-assembly of carbon or boron nitride and polypeptide, the surface of which is modified with a surfactant or is dispersed in a solution. Only certain specific materials can be used to prepare hollow nanofibers by self-assembly methods.
In the template method for preparing hollow fiber, one method is to obtain the hollow fiber with specific wall thickness or with specific surface structure by controlling the time of polymerization reaction in the nano-scale hole array on the surface of the template fiber or copying the nano-scale hole array and then removing the fiber as the template; another method is to use the electrospun fiber as a template, cover a thin film on the surface of the template fiber, and then selectively remove the template by a solvent or calcination method to obtain the hollow nanofiber.
The national university, namely the famous ancient house university (application numbers: 02823491.X and 200810166051.6), uses a template method to make a catalyst and a carbon-containing compound contact at a temperature of 500-1200 ℃ to prepare the hollow nanofiber taking carbon as a main component. The southeast university (application number: 200610096750.9) uses the electro-spinning fiber as a template and combines the layer-by-layer assembly technology to prepare the multilayer hollow fiber. However, the current electrostatic spinning technology has the problems of high material requirement and complex preparation process.
Disclosure of Invention
In order to solve the defects in the prior art, the invention provides electrostatic spinning equipment and a method for preparing nano fibers, which can form a nano coating on the surface of yarn through continuous electrostatic spinning, thereby preparing the nano fibers with small diameter and good performance, and conveniently preparing the hollow nano fibers by using the nano fibers as modules.
The technical scheme for realizing the purpose of the invention is as follows:
an electrospinning apparatus, the apparatus comprising:
the device comprises a high-voltage electrostatic generator (3), an automatic liquid supply device, a coaxial composite spray head (6), a winding device and a receiving electrode plate (11); wherein,
the high-voltage electrostatic generator (3) is electrically connected with a coaxial composite spray head (6) with two liquid inlets and one composite spray head, and the receiving electrode plate is grounded;
the coaxial composite spray head (6) is opposite to the grounded receiving electrode plate (11) and keeps a certain distance from the grounded receiving electrode plate;
the automatic liquid supply device is connected with liquid inlets (68, 69) of the coaxial composite spray head (6); the coaxial composite spray head (6) is provided with a shell and tube spray head (66) and a core tube spray head (67) which are coaxially arranged, and the shell and tube spray head (66) and the core tube spray head (67) are respectively connected with the liquid inlets (68 and 69) to respectively supply shell layer solution and core layer solution.
The winding device is arranged between the coaxial composite spray head (6) and the receiving electrode plate (11), and the base cloth or the fiber curtain conveyed on the winding device penetrates through the area between the coaxial composite spray head (6) and the receiving electrode plate (11).
Further, the coaxial composite showerhead includes: shower nozzle body (61), shower nozzle lid (62) and guide plate (64) between shower nozzle body (61) and shower nozzle lid (62), be equipped with sap cavity (65) on shower nozzle body (61), sap cavity (65) upper end is equipped with the opening, set up on the bottom surface of shower nozzle body (61) with the interior intercommunication of sap cavity (65) compound shower nozzle.
In addition, the nozzle cover (62) covers and is arranged on an opening of a liquid cavity (65) of the nozzle body (61), two liquid inlets are arranged on the nozzle cover (62), one of the liquid inlets is communicated with a core pipe nozzle (67) of the composite nozzle, and the other liquid inlet is communicated with a shell and tube nozzle (66) of the composite nozzle through the liquid cavity (65).
The sealing ring (63) is arranged at the joint between the sprayer cover (62) and the liquid cavity opening of the sprayer body (61);
the guide plate (64) is arranged in the liquid cavity of the spray head body (61), and the guide plate (64) is of a plate type structure provided with a plurality of guide holes.
The liquid inlet of the coaxial composite spray head is of two parallel tubular structures; the composite nozzle of the coaxial composite nozzle (6) is formed by sleeving a shell and tube nozzle (66) outside a core tube nozzle (67).
In addition, the composite spray head of the coaxial composite spray head is arranged downwards, and the grounded receiving electrode plate is arranged below the coaxial composite spray head.
Further, the apparatus further comprises: a spray head box made of polyamide resin, the coaxial composite spray head being disposed within the spray head box.
Further, the apparatus further comprises: and the spray head position driving device is connected with the coaxial composite spray head and drives the coaxial composite spray head to do linear reciprocating motion.
Further, the head position drive device includes: the travel switch comprises a control device, a driving device and a travel switch; wherein,
the control device is respectively electrically connected with the driving device and the travel switch and can control the driving device according to signals sent by the travel switch;
the travel switches are arranged on two sides of the coaxial composite spray head mounting position;
the driving device is connected with the coaxial composite spray head and drives the coaxial composite spray head to do linear reciprocating motion.
In addition, the high-voltage electrostatic generator adopts a direct-current high-voltage electrostatic generator with the output voltage of 5-100 KV;
the winding device consists of a feeding roller device and a discharging roller device, and the feeding roller device and the discharging roller device are respectively arranged at two sides of the area between the coaxial composite spray head and the receiving electrode plate;
the automatic liquid supply device is composed of two metering pumps and two injectors, each metering pump is connected with one injector, and a liquid outlet of each injector is respectively connected with a liquid inlet of the coaxial composite spray head; the flow control range of the automatic liquid supply device is 0.01-150 mL/min.
The present invention also provides a method of preparing a hollow nanofiber, the method comprising:
adopting the electrostatic spinning equipment of any one of the above items;
inputting a spinning solution into the coaxial composite spray head through an automatic liquid supply device, and applying high-voltage direct-current static electricity to the coaxial composite spray head through a high-voltage static generator to enable the coaxial composite spray head and a grounded receiving electrode plate to generate an electric field;
controlling high-voltage direct current static electricity on the coaxial composite spray head to enable the electric field force between the coaxial composite spray head and the receiving electrode plate to be larger than the surface tension of the spinning solution at the composite spray head of the coaxial composite spray head, and enabling the spinning solution in the coaxial composite spray head to be sprayed out from the composite spray head to coat on base cloth or fibers passing through the area between the coaxial composite spray head and the receiving electrode plate to form a coating so as to obtain composite fibers;
and placing the obtained composite fiber in a resistance furnace for preoxidation in the air, and placing the preoxidized fiber in a resistance furnace protected by nitrogen for carbonization to obtain the hollow nanofiber.
The invention has the beneficial effects that: the core layer solution can be uniformly coated by the shell layer solution to be sprayed out to form the composite nanofiber by adopting the coaxial composite spray head with the composite spray head and the plurality of liquid inlets; and the shower nozzle can conveniently be dismantled and change, can be according to the difference of required cavity nanofiber diameter, through the design multiple shower nozzle of the diameter that changes shower nozzle and syringe needle on the main part bottom plate to obtain the cavity nanofiber of various different diameters. The equipment has simple structure and can conveniently manufacture hollow nano fibers with various diameters. And, the shower nozzle is also easy to wash, can avoid the jam of shower nozzle.
Drawings
The drawings that are required to be used in the description of the embodiments are given below.
Fig. 1 is a schematic structural diagram of an apparatus according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a coaxial composite showerhead of an apparatus provided in an embodiment of the present invention;
FIG. 3 is a schematic cross-sectional view of a coaxial composite showerhead of an apparatus provided in accordance with an embodiment of the present invention;
FIG. 4 is a schematic diagram of a composite showerhead of a coaxial composite showerhead of an apparatus provided in accordance with an embodiment of the present invention;
FIG. 5 is a schematic view of a feed roller assembly of a winding assembly of an apparatus provided in an embodiment of the present invention;
FIG. 6 is an SEM photograph of a polyacrylonitrile composite fiber prepared by the equipment provided by the embodiment of the invention;
FIG. 7 is an SEM photograph of polyacrylonitrile hollow nanofibers prepared by the apparatus provided by the embodiment of the present invention.
The parts corresponding to the reference numerals in the figures are: 1. 12-a metering pump; 2. 13-a syringe; 3-high voltage electrostatic generator; 4-a control device; 5-a travel switch; 6-coaxial composite spray head; 7-a spray head box; 8-a feed roller device; 9-a discharge roller device; 10-base cloth or fiber collecting curtain; 11-receiving an electrode plate;
61-a spray head body; 62-a sprayer cover; 63-a sealing ring; 64-a baffle; 65-a liquid chamber; 66-a shell tube of a composite showerhead; 67-core tube of composite sprinkler; 68-liquid inlet of core layer, 69-liquid inlet of shell layer
80-a scaffold; 81-roller; 82-an electric motor; and 83-motor speed regulation device.
Detailed Description
The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. It is to be understood that various changes and modifications may be made by one skilled in the art after reading the teachings herein, and such equivalents are intended to fall within the scope of the invention as defined in the appended claims.
The present invention provides an electrospinning device, which is an electrospinning device using a coaxial composite nozzle as a spinneret, through which hollow nanofibers can be conveniently prepared, as shown in fig. 1, the device comprising: the device comprises a high-voltage electrostatic generator 3, an automatic liquid supply device, a coaxial composite spray head 6, a winding device and a receiving electrode plate 11;
the high-voltage electrostatic generator 3 is electrically connected with a coaxial composite spray head 6 with a composite spray head and a plurality of liquid inlets, and can be electrically connected with a needle head arranged on the liquid inlet of the coaxial composite spray head 6, so that the spinning solution in the coaxial composite spray head 6 is electrified, the high-voltage electrostatic generator 3 can adopt a direct-current high-voltage electrostatic generator with the output voltage of 5-100 KV, a receiving electrode plate 11 is grounded, and the receiving electrode plate 11 can adopt a flat plate type structure made of aluminum foil;
the coaxial composite spray head 6 and the grounded receiving electrode plate 11 are arranged oppositely and keep a certain distance, so that the composite spray head of the coaxial composite spray head is arranged downwards, and the grounded receiving electrode plate 11 is arranged below the coaxial composite spray head 6, so that the coaxial composite spray head can spray downwards;
the automatic liquid supply device is connected with a liquid inlet of the coaxial composite spray head 6; the automatic liquid supply device is composed of a plurality of metering pumps (1, 12) and a plurality of injectors (2, 13), wherein each metering pump (1, 12) is respectively connected with one injector (2, 13) to respectively form a conveying device for shell solution and core layer solution, a liquid outlet of each injector is connected with a needle head on a liquid inlet of the coaxial composite spray head (6), the liquid outlet of each injector is connected with a liquid inlet of the coaxial composite spray head (6) through the needle head, and the high-voltage electrostatic generator (3) can be connected with a guide pipe of each injector in practice, so that the needle head and the output solution are electrified. The automatic liquid supply device can meet continuous automatic transfusion and maintain precise and stable transfusion, the flow control range of the automatic liquid supply device is 0.01-150 mL/min, parameters such as flow velocity, flow and working time are recorded and displayed simultaneously, the continuous production of electrostatic spinning is guaranteed, the liquid level of liquid in the coaxial composite spray head (6) can keep an ideal arc shape, and a plurality of jet flows can be continuously extracted from the arc liquid level simultaneously.
The winding device is arranged between the coaxial composite spray head (6) and the receiving electrode plate (11), and the base cloth or the fiber curtain conveyed on the winding device penetrates through the area between the coaxial composite spray head (6) and the receiving electrode plate (11). The winding device is composed of a feeding roller device (8) and a discharging roller device (9), the feeding roller device (8) and the discharging roller device (9) can be arranged on two sides of the area between the coaxial composite spray nozzle (6) and the receiving electrode plate (11) respectively, so that the base cloth or the fiber curtain conveyed from the feeding roller device (8) to the discharging roller device (9) penetrates through the area between the coaxial composite spray nozzle (6) and the receiving electrode plate (11), the translation speed of the base cloth or the fiber curtain can be conveniently controlled by the feeding roller device (8) and the discharging roller device (9), the nanofiber felts with different thicknesses can be obtained, and the mass production of electrospun fibers can be realized.
Coaxial compound shower nozzle among the above-mentioned equipment is as shown in fig. 2 ~ 4, and this coaxial shower nozzle specifically can adopt cylindrical container structure, includes: a nozzle body 61, a nozzle cover 62, and a seal ring 63 and a guide plate 64 between the nozzle body 61 and the nozzle cover 62; the composite spray head is formed by sleeving a shell and tube spray head 66 outside a core tube spray head 67, wherein the outer diameter of the shell and tube spray head 66 is 3 mm, and the inner diameter of the core tube spray head 67 is 1.5 mm;
the nozzle cover 62 is covered on the opening of the liquid cavity 65 of the nozzle body 61, two liquid inlets (68, 69) are arranged on the nozzle cover 62, each liquid inlet is of a two-parallel-arranged tubular structure, the outer diameter of each liquid inlet is 4 mm, and the inner diameter of each liquid inlet is 2 mm; one of the liquid inlets is communicated with a core pipe spray head 67 of the composite spray head, the other spray head is communicated with a shell and tube spray head 66 of the composite spray head through a liquid cavity, and two needle heads are arranged and respectively connected to the two liquid inlets of the spray head cover; in practice, a metering pump and an injector in the automatic liquid supply device are connected to a liquid inlet at the center of the coaxial composite spray head, so as to be communicated with a core pipe spray head 67 of the composite spray head 6 to supply core layer solution; and the other metering pump and the other injector in the automatic liquid supply device are connected to the other liquid inlet on the outer side of the center of the coaxial composite spray head 6, so that the shell solution is supplied by communicating the liquid cavity 65 of the spray head body 61 with the shell and tube spray head 66 of the composite spray head 6.
The sealing ring 63 is arranged at the contact position between the sprayer cover 62 and the opening of the liquid cavity 65 of the sprayer body 61, so that a good sealing effect is achieved; the guide plate 64 is arranged in the liquid cavity of the spray head body 61, the guide plate 64 is of a plate type structure provided with a plurality of guide holes, and the guide plate 64 can enable the solution entering the spray head to uniformly enter the spray head body 61, so that the shell layer solution can uniformly flow out of the spray holes to uniformly coat the core layer solution.
The above apparatus may further be provided with a head tank made of polyamide resin, and the coaxial composite head is disposed in the head tank, thereby reducing electrostatic repulsion and interference with an electrostatic field.
The above apparatus further comprises: and the spray head position driving device is connected with the coaxial composite spray head and drives the coaxial composite spray head to do linear reciprocating motion. This shower nozzle position drive arrangement includes: the travel switch comprises a control device, a driving device and a travel switch; the control device is respectively electrically connected with the driving device and the travel switch and can control the driving device according to signals sent by the travel switch; the travel switches are arranged on two sides of the coaxial composite spray head mounting position; the driving device is connected with the coaxial composite spray head and drives the coaxial composite spray head to do linear reciprocating motion.
The equipment also comprises a nozzle position driving device which is connected with the coaxial composite nozzle and drives the coaxial composite nozzle to do linear reciprocating motion. This shower nozzle position drive arrangement specifically includes: the travel switch comprises a control device, a driving device and a travel switch; the control device is respectively electrically connected with the driving device and the travel switch and can control the driving device according to signals sent by the travel switch; the travel switches are arranged on two sides of the coaxial composite spray head mounting position, and when the coaxial composite spray head linearly reciprocates in place, the corresponding travel switches can be triggered; the driving device is connected with the coaxial composite spray head and can drive the coaxial composite spray head to do linear reciprocating motion. The coaxial composite spray head is controlled by the spray head position driving device to spray yarns in a reciprocating motion mode, so that the yarn spraying surface is enlarged, and the uniformity of the manufactured fibers is increased.
The structure of the feeding roller device in the winding device in the above-mentioned equipment is shown in fig. 6, and is connected by a roller arranged on a bracket, a motor driving the roller to rotate and a motor speed regulator regulating the speed of the motor. The structure of the discharging roller device is consistent with that of the feeding roller device, and the structure is not repeated here.
The method for preparing the hollow nano-fiber by using the electrostatic spinning equipment comprises the following steps:
inputting a spinning solution into the coaxial composite spray head through an automatic liquid supply device, and applying high-voltage direct-current static electricity to the coaxial composite spray head through a high-voltage static generator to enable the coaxial composite spray head and a grounded receiving electrode plate to generate an electric field;
controlling high-voltage direct current static electricity on the coaxial composite spray head to enable the electric field force between the coaxial composite spray head and the receiving electrode plate to be larger than the surface tension of the spinning solution at the spray hole of the coaxial composite spray head, and enabling the spinning solution in the coaxial composite spray head to be sprayed out from the spray hole of the coaxial composite spray head in a jet manner to coat on the base cloth or the fiber curtain penetrating through the area between the coaxial composite spray head and the receiving electrode plate to form a coating to obtain composite fibers;
and placing the obtained composite fiber in a resistance furnace for preoxidation in the air, and placing the preoxidized fiber in a resistance furnace protected by nitrogen for carbonization to obtain the hollow nanofiber.
The operation flow of the equipment is specifically as follows: opening a main power switch → opening a high-voltage direct-current power supply to preheat a high-voltage electrostatic generator → opening a core layer solution metering pump for transfusion → opening a shell layer solution metering pump for transfusion → opening a high-voltage switch of the high-voltage generator, adjusting voltage, starting spinning → opening a control box and a travel switch, starting reciprocating motion of a nozzle box → opening a feeding roller and a discharging roller device, adjusting the rotating speed of a motor so as to adjust the translation speed of a base cloth or a fiber collecting curtain → sequentially closing a core layer solution and a shell layer solution metering pump after spinning is finished, stopping transfusion → closing a high-voltage switch of a high-voltage electrostatic generator, stopping spinning → closing a power supply of the high-voltage generator → closing a power supply of a fiber conveying device, stopping curling of the base cloth or the fiber collecting curtain → closing the control box, stopping the reciprocating motion of the spray head → closing the main power switch → taking off the spun fiber from the fiber conveying device → putting the spun composite fiber in a resistance furnace for pre-oxidation in air → putting the pre-oxidized fiber in N.2Carbonizing in a protected resistance furnace.
When the equipment is used, Polyacrylonitrile (PAN) solution is used as a shell solution, and methyl silicone oil is used as a core solution for spinning, the concentration of the PAN solution is 1.5-2.0 g/mL, the PAN solution is injected into a shell solution metering pump, the methyl silicone oil is injected into a core solution metering pump, and the infusion speed is controlled to be 0.01-1 mL/min. Regulating the voltage of the high-voltage electrostatic generator to 20kV, translating the winding device at the speed of 0.5m/min, and windingThe distance between the coaxial compound and the coaxial compound is 20 cm. An SEM photograph of the spun composite nanofiber is shown in fig. 6. Placing the composite nano-fiber obtained by electrostatic spinning in a resistance furnace, carrying out pre-oxidation treatment in air at 250 ℃ for 2h, and then carrying out N treatment in the resistance furnace2Carbonizing at 900 deg.C for 2h under protection, and obtaining hollow nanofiber with Scanning Electron Microscope (SEM) as shown in FIG. 7.
The combined nozzle can enable the shell layer solution to uniformly coat the core layer solution so as to form the composite nanofiber; the combined spray head can be conveniently detached and replaced, and various spray heads can be designed by changing the diameters of the spray head and the needle head on the bottom plate of the main body according to the different diameters of the required hollow nano fibers so as to obtain hollow nano fibers with different diameters; the guide plate can ensure that the solution entering the spinneret uniformly enters the spinneret cover, so that the shell layer solution can uniformly flow out of the nozzles to uniformly coat the core layer solution; the combined spray head is fixed in the spray head box, and the spray head box is synthesized by polyamide resin, so that electrostatic repulsion and interference on an electrostatic field are reduced; the electrospinning fiber receiving material adopts a roller conveying device, so that the mass production of electrospinning composite fibers can be realized, and the guarantee is provided for the mass production of carbon nanotubes; under the condition of the same process conditions, the fineness of the spun nanofiber is half smaller than that of the traditional electrostatic spinning machine; designing an electrospinning fiber conveying device, and controlling the speed of an electrospinning receiving material passing through an electrospinning fiber generating area by adjusting a feeding roller device and a discharging roller device so as to obtain composite nanofiber felts with different thicknesses, wherein the composite nanofiber felts can be subjected to preoxidation and carbonization treatment to obtain carbon nanotubes with different thicknesses; the automatic transfusion device can meet continuous automatic transfusion, maintain precise transfusion quantity, provide guarantee for electrostatic spinning continuous production, enable the liquid level of liquid in the spray head to keep an ideal arc shape, and simultaneously and uninterruptedly extract a plurality of jet flows from the arc liquid level.
The above description is only for the preferred embodiments of the present invention, but the scope of the present invention is not limited to these embodiments, and those skilled in the art can conceive modifications and substitutions within the scope of the present invention. Therefore, the protection scope of the present invention is subject to the protection scope of the claims.
Claims (10)
1. An electrospinning apparatus, the apparatus comprising:
the device comprises a high-voltage electrostatic generator (3), an automatic liquid supply device, a coaxial composite spray head (6), a winding device and a receiving electrode plate (11); wherein,
the high-voltage electrostatic generator (3) is electrically connected with a coaxial composite spray head (6) with two liquid inlets and one composite spray head, and the receiving electrode plate is grounded;
the coaxial composite spray head (6) is opposite to the grounded receiving electrode plate (11) and keeps a certain distance from the grounded receiving electrode plate;
the automatic liquid supply device is connected with liquid inlets (68, 69) of the coaxial composite spray head (6); the coaxial composite spray head (6) is provided with a shell and tube spray head (66) and a core tube spray head (67) which are coaxially arranged, and the shell and tube spray head (66) and the core tube spray head (67) are respectively connected with the liquid inlets (68 and 69) to respectively supply shell layer solution and core layer solution.
The winding device is arranged between the coaxial composite spray head (6) and the receiving electrode plate (11), and the base cloth or the fiber curtain conveyed on the winding device penetrates through the area between the coaxial composite spray head (6) and the receiving electrode plate (11).
2. The electrospinning apparatus of claim 1, wherein the coaxial compound nozzle comprises: shower nozzle body (61), shower nozzle lid (62) and guide plate (64) between shower nozzle body (61) and shower nozzle lid (62), be equipped with sap cavity (65) on shower nozzle body (61), sap cavity (65) upper end is equipped with the opening, set up on the bottom surface of shower nozzle body (61) with the interior intercommunication of sap cavity (65) compound shower nozzle.
3. The electrospinning device according to claim 2, wherein the nozzle cover (62) covers the opening of the liquid cavity (65) of the nozzle body (61), and two liquid inlets are arranged on the nozzle cover (62), wherein one liquid inlet is communicated with the core tube nozzle (67) of the composite nozzle, and the other liquid inlet is communicated with the shell and tube nozzle (66) of the composite nozzle through the liquid cavity (65).
4. Electrospinning device according to claim 2, characterized in that the sealing ring (63) is provided at the connection between the nozzle cover (62) and the liquid chamber opening of the nozzle body (61);
the guide plate (64) is arranged in the liquid cavity of the spray head body (61), and the guide plate (64) is of a plate type structure provided with a plurality of guide holes.
5. The electrospinning device according to any of claims 1 to 4, wherein the liquid inlet of the coaxial composite nozzle is of two parallel tubular structures; the composite nozzle of the coaxial composite nozzle (6) is formed by sleeving a shell and tube nozzle (66) outside a core tube nozzle (67).
6. An electrospinning device according to any of claims 1-4, characterized in that the composite nozzle of the coaxial composite nozzle (6) is directed downwards and the grounded receiving electrode plate (11) is arranged below the coaxial composite nozzle (6).
7. The electrospinning apparatus of any one of claims 1-4, further comprising: a spray head box made of polyamide resin, the coaxial composite spray head being disposed within the spray head box.
8. The electrospinning apparatus of any one of claims 1-4, further comprising: the spray head position driving device is connected with the coaxial composite spray head and drives the coaxial composite spray head to do linear reciprocating motion; the head position drive device includes: the travel switch comprises a control device, a driving device and a travel switch; wherein,
the control device is respectively electrically connected with the driving device and the travel switch and can control the driving device according to signals sent by the travel switch;
the travel switches are arranged on two sides of the coaxial composite spray head mounting position;
the driving device is connected with the coaxial composite spray head and drives the coaxial composite spray head to do linear reciprocating motion.
9. The electrostatic spinning equipment according to claim 1, wherein the high-voltage electrostatic generator is a direct-current high-voltage electrostatic generator with the output voltage of 5-100 KV;
the winding device consists of a feeding roller device and a discharging roller device, and the feeding roller device and the discharging roller device are respectively arranged at two sides of the area between the coaxial composite spray head and the receiving electrode plate;
the automatic liquid supply device is composed of two metering pumps and two injectors, each metering pump is connected with one injector, and a liquid outlet of each injector is respectively connected with a liquid inlet of the coaxial composite spray head; the flow control range of the automatic liquid supply device is 0.01-150 mL/min.
10. A method of making a hollow nanofiber, comprising:
using the electrospinning apparatus of any of claims 1 to 9;
inputting a spinning solution into the coaxial composite spray head through an automatic liquid supply device, and applying high-voltage direct-current static electricity to the coaxial composite spray head through a high-voltage static generator to enable the coaxial composite spray head and a grounded receiving electrode plate to generate an electric field;
controlling high-voltage direct current static electricity on the coaxial composite spray head to enable the electric field force between the coaxial composite spray head and the receiving electrode plate to be larger than the surface tension of the spinning solution at the composite spray head of the coaxial composite spray head, and enabling the spinning solution in the coaxial composite spray head to be sprayed out from the composite spray head to coat on base cloth or fibers passing through the area between the coaxial composite spray head and the receiving electrode plate to form a coating so as to obtain composite fibers;
and placing the obtained composite fiber in a resistance furnace for preoxidation in the air, and placing the preoxidized fiber in a resistance furnace protected by nitrogen for carbonization to obtain the hollow nanofiber.
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| CN2012101723935A CN103451750A (en) | 2012-05-30 | 2012-05-30 | Electrostatic spinning device and method for manufacturing hollow nanometer fiber |
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| CN2012101723935A CN103451750A (en) | 2012-05-30 | 2012-05-30 | Electrostatic spinning device and method for manufacturing hollow nanometer fiber |
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