Combined spinning head combining side-by-side capillary tubes with confined liquid level, electrostatic spinning equipment and batch preparation method of three-chamber embedded parallel structure nanofibers

Abstract

The invention discloses a combined spinning head combining side-by-side capillary tubes with a confined liquid level, electrostatic spinning equipment and a batch preparation method of three-chamber embedded parallel structure nanofibers. The side-by-side capillary tube combined confinement liquid level spinning head comprises a plurality of groups of metal capillary tube combinations and a metal hollow wedge, wherein every two metal capillary tube combinations are closely adjacent and side-by-side; any group of metal capillary tube combination comprises two sets of metal capillary tubes; all the metal capillary tubes penetrate through the metal hollow wedge in a pairwise parallel manner, are separated upwards at the upper part of the wedge body and then are converged into two sets of metal capillary tube combinations again to guide two different fluids; a liquid inlet is formed in the upper wide part of the metal hollow wedge, and an opening is formed in the lower narrow part; and the outlet end of the metal capillary tube combination is close to one wedge edge and extends out of the bottom surface of the lower narrow part of the metal hollow wedge by 0.8-1.2 mm. According to the method, outlets of a plurality of complex combined nozzles are used as macroscopic templates, and under the high-voltage electrostatic field, batch preparation of the three-chamber embedded parallel structure nanofibers is achieved through interaction of the high-voltage electrostatic field and fluid.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electrospinning, in particular to a kind of parallel capillary combined with limited liquid surface spinning head, electrospinning equipment and batch preparation method of three-chamber chimeric parallel structure nanofiber. BACKGROUND

[0002] The material world is structure-controlled, and new nanostructures mean new nanotechnology. The importance of artificial nanostructures and their preparation methods in the field of nanotechnology is self-evident. There are hundreds of thousands of papers on the topic of two-level "core-shell or core-sheath" and "Janus or side-by-side" on Web of Science. Based on the comprehensive research and report of these two two-chamber structures, various complex nanostructures with multiple chambers are attracting widespread attention worldwide. These structures include three-level and above core-shell structures, three-level and above parallel structures, one-sheath multi-core island structures, etc. Since the interface between materials and the environment plays a crucial role in the function of nanomaterials, compared to core-shell structures, parallel structures will be more flexible and effective in the design and construction of nanomaterial functions. Batch single-step preparation of complex nanostructures is a difficult problem that cannot be directly solved in the field of nanotechnology. The solution to this problem will open up new ways for the commercialization of many advanced functional materials based on complex nanostructures.

[0003] The preparation of complex nanostructures mainly has two ways, top-down and bottom-up, and in these two ways, a variety of different preparation techniques appear. Among the numerous top-down techniques, the electrohydrodynamic atomization technology (EHDA) based on fluid and high-voltage electrostatic interaction, including high-voltage electrospinning, high-voltage electrospinning mist and spinning jet printing technology, can effectively overcome the disadvantages of the bottom-up technology, such as complicated process, time-consuming, and difficult or even impossible to expand production. In recent years, it has been favored. Among various EHDA technologies, high-voltage electrospinning technology (electrospinning for short) is a top-down nanomanufacturing technology. By applying an electric field force to overcome the liquid surface tension and viscoelastic force of the microfluidic control nozzle tip droplet, a jet is formed. According to the macroscopic template of the needle head outlet structure, under the joint action of electrostatic repulsion, Coulomb force and surface tension, the atomized liquid jet is highly curved, drawn, and split in tens of milliseconds, and is drawn by millions of times. After solvent evaporation or melt cooling, nanofibers are obtained at the receiving end. This technology has the advantages of simple process, easy operation, wide range of material selection, strong controllability, and can be used to design and prepare nanofibers with microstructure characteristics by microfluidic control nozzle. It is considered to be the most likely method to realize the industrialized production of continuous nanofibers, and the application of this technology to prepare functional nanofibers has good prospects.

[0004] So far, according to the way of fluid diversion into a high-voltage electric field, electrospinning can be divided into two types, namely needle type and free liquid surface type. The advantage of the former is that it can be used as a macroscopic template according to the structure of the needle head outlet to prepare corresponding nanostructures; the advantage of the latter is that it is easy to scale up batch production. The disadvantage of the former is that batch scale production requires a large number of arranged needles, and a large number of syringe pumps, high-voltage generators, and production space. The disadvantage of the latter is that it cannot accurately prepare various multi-chamber nanostructures. The new spinning head of the present application effectively combines the advantages of the above two types of spinning heads by combining needle with limited liquid surface, while avoiding the disadvantages of the two. It provides a new tool for batch production of complete micro-nanofibers with complex multi-chamber structure characteristics, and batch production of micro-nanostructures has always been a difficult and key problem in microfabrication and production of new micro-nano products. SUMMARY

[0005] In view of the above defects in the prior art, the present application provides a combined spinning head of side-by-side capillary tubes combined with a confined liquid surface, an electrospinning device and a batch preparation method of nanofibers with a three-chamber embedded parallel structure, which realizes the synchronous guiding of three fluid streams into a high-voltage electrostatic field, takes multiple complex combined nozzle outlets as a macroscopic template, and realizes the batch preparation of complex structure nanofibers under the high-voltage electrostatic field through the interaction between the high-voltage electrostatic field and the fluid.

[0006] In order to achieve the above-mentioned purpose, in the first aspect, the present application provides a combined spinning head of side-by-side capillary tubes combined with a confined liquid surface, which comprises multiple groups of metal capillary tube combinations that are adjacent to each other in pairs and a metal hollow wedge.

[0007] Any group of the metal capillary tube combination comprises one metal capillary tube in each of the two sets; all the metal capillary tubes are parallel to each other and penetrate through the metal hollow wedge, and then are separated on the wedge body and re-collected into two sets of metal capillary tube combinations to guide two different fluids; the wide part of the metal hollow wedge is provided with a liquid inlet, and the narrow part of the metal hollow wedge is open.

[0008] The outlet end of the metal capillary tube combination protrudes from the bottom surface of the narrow part of the metal hollow wedge by 0.8-1.2 mm along one wedge edge; the distance between adjacent metal capillary tube combinations is 2.0-5.0 cm.

[0009] The metal wedge in the above-mentioned spinning head provides a linear confined liquid surface, which, under a high-voltage electrostatic field, together with the two fluid streams provided by the two metal capillary tubes penetrating through the metal wedge, forms a parallel flow guiding outlet with a three-chamber embedded parallel structure and parallel outflow, which can effectively play the guiding role of the capillary tube "needle" to facilitate the rapid start of the electrospinning process. The confined liquid surface along the edge of the metal wedge is slightly lower than the position of the needle tip, which can ensure the synchronous generation of the third embedded fluid from the free liquid surface along the edge of the wedge while preventing the mutual diffusion of the internal components of different jets. At the same time, since the entire combined spinning head is a complete charged body, it can prevent the "large" electrostatic repulsion between the Taylor cone at the outlet of the independent needle and the Taylor cone at the outlet of the other needle in the traditional multi-needle electrospinning, and only the "small" electrostatic repulsion between the Taylor cones with similar free liquid surfaces, thereby ensuring the accurate "copying" of the nanofibers with the three-chamber embedded parallel structure from the macroscopic combined outlet template to the microscopic three-chamber embedded parallel structure.

[0010] Further, the wedge width of the metal hollow wedge is 1.0-2.0 mm to provide a confined liquid surface; the inner diameter of the metal capillary tube is 0.5-1.0 mm, and the metal capillary tube protrudes from the narrow part of the wedge by 1.0 mm along one wedge edge.

[0011] Further, the three fluid combined outlets are jointly formed by the side-by-side stainless steel capillary tubes combined with a confined liquid surface.

[0012] Further, the material of the metal capillary and the metal hollow wedge is stainless steel or red copper.

[0013] In a second aspect, the present application further provides an electrospinning device, comprising a first syringe pump, a first syringe, a second syringe pump, a second syringe, a third syringe pump, a third syringe, a fiber receiving plate, a high-voltage generator, and a combined spinning head of side-by-side capillary combined with a confined liquid surface as described above;

[0014] The first syringe is installed on the first syringe pump, the second syringe is installed on the second syringe pump, and the third syringe is installed on the third syringe pump; the outlets of the first syringe and the second syringe are respectively connected to the different fluid collection inlets of the two sets of metal capillaries through liquid outlet pipes; the outlet of the third syringe is connected to the liquid inlet of the metal hollow wedge through a liquid outlet pipe; the fiber receiving plate is arranged directly below the combined spinning head of side-by-side capillary combined with a confined liquid surface, and the high-voltage generator is electrically connected to the two sets of metal capillaries.

[0015] Further, the fiber receiving plate is an aluminum foil wrapped hardboard; the fiber receiving plate and the high-voltage generator are both grounded.

[0016] In a final aspect, the present application provides a batch preparation method of three-chamber embedded parallel structure nanofibers, which is prepared by the electrospinning device described above, three spinning solutions are respectively added to the first syringe, the second syringe, and the third syringe, the first syringe pump, the second syringe pump, the third syringe, and the high-voltage generator are started, and three-chamber embedded parallel structure nanofibers can be prepared in a single step by the action of the high-voltage electrostatic field. The three-chamber embedded parallel nanometer structure includes three independent fiber inner chambers that are connected to each other and embedded in each other in a single nanofiber.

[0017] A plurality of combined structure spinning nozzle outlets are arranged in the combined spinning head of side-by-side capillary combined with a confined liquid surface, three spinning fluid streams are synchronously guided into the high-voltage electrostatic field, and the three spinning fluid streams are stretched into three-chamber embedded parallel structure clear solid nanofibers in a few milliseconds under the high-voltage electrostatic field and the interaction between the high-voltage electrostatic field and the fluid, with the plurality of complex combined spinning nozzle outlets as a macroscopic template.

[0018] Further, the first spinning solution is an ethanol solution of ethyl cellulose with a mass percentage concentration of 25%, the second spinning solution is an ethanol solution of polyvinylpyrrolidone with a mass concentration of 8%, the third spinning solution is a corn alcohol-soluble protein with a mass percentage concentration of 20%, the flow rate of the first syringe is controlled to be 5-30 mL / h, the flow rate of the second syringe is controlled to be 5-30 mL / h, the flow rate of the third syringe is controlled to be 5-30 mL / h, the distance between the fiber receiving plate and the combined spinning head is 15 cm, and the spinning voltage is set to be 20-60 kV.

[0019] Further, the flow rate of the first injector is controlled to be 10 mL / h, the flow rate of the second injector is controlled to be 10 mL / h, the flow rate of the third injector is controlled to be 10 mL / h, the distance between the fiber receiving plate and the combined spinneret is 15 cm, and the spinning voltage is set to be 32 kV.

[0020] The above technical solution is only one possible technical solution of the present application, and the protection scope of the present application is not limited to this. Those skilled in the art can reasonably adjust the specific design according to actual needs.

[0021] So far, according to the way of guiding fluid into a high-voltage electric field, electrospinning can be divided into two types, namely, needle type and free liquid surface type. The advantage of the former is that it can be used as a macroscopic template according to the structure of the needle outlet to prepare corresponding nanostructures; the advantage of the latter is that it is easy to scale up batch production. The disadvantage of the former is that batch scale production requires a large number of arranged needles, and a large number of injection pumps, high-voltage generators, and production spaces. The disadvantage of the latter is that it cannot accurately prepare various multi-chamber nanostructures.

[0022] The present application adopts the structure of side-by-side metal capillary combination and metal hollow wedge combination, effectively forms a complete charged body by combining the needle with the limited liquid surface, overcomes the problem of electrostatic repulsion between multiple needles, combines the advantages of the above two types of spinnerets, avoids the disadvantages of the two types of spinnerets, and realizes the batch single-step preparation of complex three-chamber embedded parallel structure.

[0023] The combined spinneret of side-by-side capillary combined with limited liquid surface of the present application endows electrospinning with the ability to effectively and batch scale produce three-chamber embedded parallel structure nanofibers in a single step, provides strong support for the development, production and commercial application of complex structure nanoproducts, and can well adjust the microstructure of the three-chamber embedded parallel structure nanofibers by adjusting the flow rate of each spinning solution and the electrospinning voltage, so as to construct new nanostuctures with different material properties. BRIEF DESCRIPTION OF DRAWINGS

[0024] The present application and its features, shapes and advantages will become more apparent by reading the following detailed description of non-limiting embodiments with reference to the accompanying drawings. The same reference signs indicate the same parts throughout the drawings. The drawings are not necessarily drawn to scale, and the emphasis is on illustrating the main idea of the present application.

[0025] Figure 1 It is a structure schematic diagram of the combined spinneret of side-by-side capillary combined with limited liquid surface in the embodiment 1 of the present application and an enlarged view of a nozzle outlet;

[0026] Figure 2 It is a structure schematic diagram of the electrospinning equipment in the embodiment 1 of the present application;

[0027] Figure 3 Scanning electron microscope image of the nanofiber prepared in Example 1 of the present application;

[0028] Figure 4 Transmission electron microscope image of the nanofiber prepared in Example 1 of the present application;

[0029] Figure 5 Scanning electron microscope image of the nanofiber prepared in Example 2 of the present application;

[0030] Figure 6 Transmission electron microscope image of the nanofiber prepared in Example 2 of the present application;

[0031] Figure 7 Scanning electron microscope image of the nanofiber prepared in Example 3 of the present application;

[0032] Figure 8 Transmission electron microscope image of the nanofiber prepared in Example 3 of the present application;

[0033] Wherein, 1, first capillary collection inlet; 2, second capillary collection inlet; 3, liquid inlet; 4, nozzle outlet; 51, first series of metal capillary; 52, second series of metal capillary; 6, metal hollow wedge; 7, high-voltage generator; 8, first syringe; 9, second syringe; 10, third syringe; 11, combined spinning head of side-by-side capillary combined with limited liquid surface; 12, first syringe pump; 13, second syringe pump; 14, third syringe pump; 15, first high-elasticity silica gel tube; 16, second high-elasticity silica gel tube; 17, third high-elasticity silica gel tube; 18, fiber receiving plate; 19, fixed support. DETAILED DESCRIPTION

[0034] The application will be further described below in conjunction with the drawings and specific examples. It should be understood that these examples are only used to illustrate the application and not used to limit the scope of the application. Furthermore, it should be understood that after reading the content of the present application, those skilled in the art can make various modifications or changes to the application, and these equivalent forms also fall within the scope of the appended claims.

[0035] In the description of the present application, it should be understood that the terms "first", "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. The meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0036] Example 1

[0037] ReferenceFigure 1 The embodiment provides a combined spinning head of parallel capillary tubes combined with limited liquid surface, which comprises a plurality of groups of metal capillary tube combinations each consisting of two metal capillary tubes adjacent to each other in parallel and a metal hollow wedge 6; three spinning solutions are guided to the nozzle outlet 4 through the first series of metal capillary tubes 51, the second series of metal capillary tubes 52 and the metal hollow wedge 6; any group of the metal capillary tube combination comprises one metal capillary tube in each of the two sets of metal capillary tubes; all the metal capillary tubes are parallel to each other and pass through the metal hollow wedge 6, and then are separated on the wedge body and are recombined into the two sets of metal capillary tube combinations to guide two different fluids: the first capillary tube collection inlet 1 and the second capillary tube collection inlet 2; the upper wide part of the metal hollow wedge 6 is provided with a liquid inlet, and the lower narrow part is open; the outlet end of the metal capillary tube combination extends 0.8-1.2 mm from the bottom surface of the lower narrow part of the metal hollow wedge 6 close to one wedge edge; the spacing between adjacent metal capillary tube combinations is 2-5 cm; and the upper part of the metal hollow wedge 6 is provided with a liquid inlet 3.

[0038] In the embodiment, the wedge width of the metal hollow wedge 6 is 1-2 mm, the limited liquid surface is provided, and the inner diameter of the metal capillary tube is 0.5-1.0 mm. The material of the metal capillary tube and the metal hollow wedge can be stainless steel or red copper.

[0039] The metal wedge provides a linear limited liquid surface, and under the high-voltage electrostatic field, the metal wedge and the two stainless steel capillary tubes penetrating the metal wedge together provide two fluid streams to form a parallel guiding outlet of three fluid chambers embedded in parallel and parallel flow.

[0040] The combined spinning head of parallel capillary tubes combined with limited liquid surface is used for high-voltage electrospinning. Referring to Figure 2, electrospinning device includes a first syringe pump 12, a first syringe 8, a second syringe pump 13, a second syringe 9, a third syringe pump 14, a third syringe 10, a fiber receiving plate 18, a high-voltage generator 7 and the above-mentioned combined spinning head 11 of side-by-side capillary combined with a confined liquid surface. The electrospinning device using the combined spinning head 11 of side-by-side capillary combined with a confined liquid surface can batch produce three-chamber chimeric parallel structure nanofibers, and the specific steps are as follows: the first syringe 8 is installed in the first syringe pump 12, and the first spinning liquid is added in the first syringe 8. The first spinning liquid is directly delivered to the beverage bottle through the first high-elastic silica gel tube 15. The second syringe 9 is installed in the second syringe pump 13, and the second spinning liquid is added in the second syringe 9. The second spinning liquid is introduced into the first series of metal capillaries 51 of the combined spinning head 11 of side-by-side capillary combined with a confined liquid surface through the second high-elastic silica gel tube 16. The third syringe 10 is installed in the third syringe pump 14, and the third spinning liquid is added in the third syringe 10. The spinning liquid is introduced into the second series of metal capillaries 52 of the combined spinning head 11 of side-by-side capillary combined with a confined liquid surface through the third high-elastic silica gel tube 17.

[0041] The high-voltage generator 7 and the combined spinning head 11 of side-by-side capillary combined with a confined liquid surface can be directly connected through a stainless steel capillary to facilitate the transmission of high-voltage electrostatic energy. A fiber receiving plate 18 is arranged at the lower end of the combined spinning head 11 of side-by-side capillary combined with a confined liquid surface. The fiber receiving plate 18 is an aluminum foil wrapped hardboard, and the receiving plate is grounded. The entire combined spinning head 11 of side-by-side capillary combined with a confined liquid surface for preparing three-chamber chimeric parallel structure can be suspended and fixed on the operating table through a fixed support 19.

[0042] The installation and use method of the above-mentioned multi-fluid high-voltage electrospinning device is as follows:

[0043] The first spinning liquid, the second spinning liquid and the third spinning liquid are respectively added into the first syringe, the second syringe and the third syringe. The first spinning liquid, the second spinning liquid and the third spinning liquid can be delivered to the first series of metal capillaries 51, the second series of metal capillaries 52 and the metal hollow wedge 6 by starting the first syringe pump, the second syringe pump and the third syringe pump. The high-voltage generator is turned on. Through the action of the high-voltage electrostatic field, the nanofibers can be batch produced in a single step. Specifically, the steps are as follows:

[0044] (1) Preparation of spinning liquid

[0045] The first spinning liquid is an ethanol solution with a mass percentage concentration of 25% ethyl cellulose. The preparation method is as follows: 250 g of ethyl cellulose powder is added into 750 g of ethanol, and stirring and dissolving are carried out to obtain the spinning liquid.

[0046] The second spinning solution is a polyvinylpyrrolidone solution with a mass percentage concentration of 8%, which is prepared as follows: 80 g of polyvinylpyrrolidone is dissolved in 920 g of ethanol.

[0047] The third spinning solution is a 75% (by volume) aqueous ethanol solution of zein with a mass percentage concentration of 20%, which is prepared as follows: 200 g of zein is dissolved in 800 g of an ethanol solution, and stirring is performed until dissolution is completed.

[0048] (2) The first, second, and third spinning solutions obtained in step (1) are added to the corresponding syringes, and then the first, second, and third injection pumps are turned on.

[0049] (3) The flow rate of the first syringe is controlled to be 10 mL / h, the flow rate of the second syringe is controlled to be 10 mL / h, the flow rate of the third syringe is controlled to be 10 mL / h, the high-voltage generator is turned on, the fiber plate receiving distance is adjusted to be 15 cm, the voltage is increased to 32 kV, and electrospinning is performed, so that three-compartment chimeric parallel structure nanofibers can be prepared in a single step in batches.

[0050] The surface of the three-compartment chimeric parallel structure nanofibers prepared in Example 1 is observed after gold spraying, and the results are shown in FIG. 1. Figure 3 The prepared parallel structure nanofibers are collected uniformly and exhibit a good linear state, and the diameter is 710 ± 130 nm. The prepared parallel structure nanofibers are observed by high-resolution transmission electron microscopy, and the results are shown in FIG. 2. Figure 4 The nanofibers are composed of four gray parts, and the three junction chimeric lines are clearly distinguishable, reflecting the internal structure characteristics of the three-compartment chimeric parallel structure.

[0051] Example 2

[0052] This example provides a method for preparing three-compartment chimeric parallel structure nanofibers by using the side-by-side capillary combined with a limited liquid surface spinning head and an electrospinning device comprising the same as described in Example 1. The structure and use of the spinning head and the electrospinning device are similar to those in Example 1, and the difference from Example 1 is that the flow rate of the first syringe is controlled to be 5 mL / h, the flow rate of the second syringe is controlled to be 5 mL / h, the flow rate of the third syringe is controlled to be 5 mL / h, the high-voltage generator is turned on, the fiber plate receiving distance is adjusted to be 15 cm, the voltage is increased to 20 kV, and electrospinning is performed.

[0053] The surface of the three-compartment chimeric parallel structure nanofibers prepared in Example 2 is observed after gold spraying, and the results are shown in FIG. 3. Figure 5The prepared parallel structure nanofibers are collected uniformly and present a good linear state, with a diameter of 640 ± 170 nm. The prepared parallel structure nanofibers are observed by high-resolution transmission electron microscopy, and the results are shown in FIG. 3. As shown in FIG. 3, the nanofiber is composed of four gray parts, and the three interfacial embedded lines are clearly distinguishable, reflecting the internal structural characteristics of the three-chamber embedded parallel structure, and the respective widths of the three chambers and the overall fiber diameter are smaller than those in Example 1. Figure 6 As shown in FIG. 3, the nanofiber is composed of four gray parts, and the three interfacial embedded lines are clearly distinguishable, reflecting the internal structural characteristics of the three-chamber embedded parallel structure, and the respective widths of the three chambers and the overall fiber diameter are smaller than those in Example 1.

[0054] Example 3

[0055] This example provides a method for preparing three-chamber embedded parallel structure nanofibers by using the side-by-side capillary as described in Example 1, combining a confined liquid surface spinning head, and an electrospinning device comprising the same. The structure and use of the spinning head and electrospinning device are similar to those in Example 1, and the difference from Example 1 is that the flow rate of the first syringe is controlled to be 30 mL / h, the flow rate of the second syringe is controlled to be 30 mL / h, the flow rate of the third syringe is controlled to be 30 mL / h, the high-voltage generator is turned on, the receiving distance of the fiber plate is adjusted to be 15 cm, and the voltage is raised to 60 kV for electrospinning.

[0056] The surface of the three-chamber embedded parallel structure nanofibers prepared in Example 2 is observed by field scanning electron microscopy after sputtering, and the results are shown in FIG. 4. As shown in FIG. 4, the prepared parallel structure nanofibers are collected uniformly and present a good linear state, with a diameter of 870 ± 230 nm. Figure 7 The prepared parallel structure nanofibers are observed by high-resolution transmission electron microscopy, and the results are shown in FIG. 4. As shown in FIG. 4, the nanofiber is composed of four gray parts, and the three interfacial embedded lines are clearly distinguishable, reflecting the internal structural characteristics of the three-chamber embedded parallel structure, and the respective widths of the three chambers and the overall fiber diameter are larger than those in Example 1. Figure 8 As shown in FIG. 4, the nanofiber is composed of four gray parts, and the three interfacial embedded lines are clearly distinguishable, reflecting the internal structural characteristics of the three-chamber embedded parallel structure, and the respective widths of the three chambers and the overall fiber diameter are larger than those in Example 1.

[0057] The batch preparation method of the three-chamber embedded parallel nanofiber structure of the present application is simple to apply, easy to operate and control, and can effectively expand the scale of preparation of the three-chamber embedded parallel structure nanofiber under a high-voltage electric field, thereby providing strong support for the development, production and commercial application of products based on the three-chamber embedded parallel structure nanofiber.

[0058] Those skilled in the art should understand that those skilled in the art can make changes in combination with the prior art and the above examples, which are not described herein. Such changes do not affect the essential content of the present application, and are not described herein.

[0059] The preferred embodiments of the present application have been described. It is to be understood that the application is not limited to the above specific embodiments, and that devices and structures not described in detail should be understood to be implemented in the ordinary way in the art; any person skilled in the art can make many possible changes and modifications to the technical solutions of the present application, or modify them into equivalent embodiments with equivalent changes, without departing from the scope of the technical solutions of the present application, which does not affect the essential content of the present application. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present application, without departing from the content of the technical solutions of the present application, still belongs to the scope of protection of the technical solutions of the present application.

Claims

1. A combination spinning head of side-by-side capillary bonding confined liquid surface, characterized in that: The combination comprises a plurality of sets of two immediately adjacent and side-by-side metal capillary tube assemblies and a metal hollow wedge; Any one of the metal capillary tube assemblies comprises one of the two sets of metal capillary tubes; all the metal capillary tubes are parallel to each other and pass through the metal hollow wedge, and after being separated on the wedge body, they are recombined into two sets of metal capillary tube assemblies to guide two different fluids; the upper wide part of the metal hollow wedge is provided with a liquid inlet, and the lower narrow part is open; The outlet end of the metal capillary tube assembly extends 0.8-1.2 mm from the bottom surface of the lower narrow part of the metal hollow wedge near one of the wedge edges; the spacing between adjacent metal capillary tube assemblies is 2.0-5.0 cm.

2. The combination spinning head of claim 1, wherein, The wedge width of the metal hollow wedge is 1.0-2.0 mm, providing a long strip-shaped limited free liquid surface; the inner diameter of the metal capillary tube is 0.5-1.0 mm and extends 1.0 mm from the lower narrow part of the wedge near one of the wedge edges.

3. The combination spinning head of claim 2, wherein the capillary channel is formed by a groove in the surface of the substrate. The three-fluid combination outlet formed by the side-by-side stainless steel capillary tubes combined with the limited liquid surface.

4. The combination spinning head of claim 1, wherein, The metal capillary tube and the metal hollow wedge are made of stainless steel or red copper.

5. An electrospinning apparatus, characterized by, The combination spinning head comprising a first syringe pump, a first syringe, a second syringe pump, a second syringe, a third syringe pump, a third syringe, a fiber receiving plate, a high-voltage generator, and the side-by-side capillary tube combination limited liquid surface according to any one of claims 1-4; The first syringe is mounted on the first syringe pump, the second syringe is mounted on the second syringe pump, and the third syringe is mounted on the third syringe pump; the outlets of the first syringe and the second syringe are connected to the different fluid collection inlets of the two sets of metal capillary tubes through liquid outlet pipes, respectively; the outlet of the third syringe is connected to the liquid inlet of the metal hollow wedge through a liquid outlet pipe; The fiber receiving plate is arranged directly below the combination spinning head of the side-by-side capillary tube combination limited liquid surface, and the high-voltage generator is electrically connected to the two sets of metal capillary tubes.

6. The electrospinning apparatus of claim 5, wherein, The fiber receiving plate is an aluminum foil wrapped hardboard; the fiber receiving plate and the high-voltage generator are both grounded.

7. A method for mass production of a three-compartment chimeric and parallel structure nanofiber, characterized by, The electrospinning device of claim 5 or 6 is used for batch preparation, three spinning solutions are added to the first syringe, the second syringe, and the third syringe, respectively, the first syringe pump, the second syringe pump, the third syringe, and the high-voltage generator are started, and three-chamber chimeric parallel structure nanofibers can be prepared in a single step by the action of a high-voltage electrostatic field.

8. The method according to claim 7, wherein the method is characterized by, The first spinning solution is an ethanol solution of ethyl cellulose with a mass percentage concentration of 25%; the second spinning solution is an ethanol solution of polyvinylpyrrolidone with a mass concentration of 8%; the third spinning solution is a corn alcohol-soluble protein with a mass percentage concentration of 20%; the flow rate of the first syringe is controlled to be 5-30 mL / h, the flow rate of the second syringe is controlled to be 5-30 mL / h, the flow rate of the third syringe is controlled to be 5-30 mL / h, the distance between the fiber receiving plate and the combination spinning head is 15 cm, and the spinning voltage is set to be 20-60 kV.

9. The method according to claim 8, wherein, The flow rate of the first syringe was controlled at 10 mL / h, the flow rate of the second syringe was controlled at 10 mL / h, the flow rate of the third syringe was controlled at 10 mL / h, the distance between the fiber receiving plate and the combined spinning head was 15 cm, and the spinning voltage was set at 32 kV.

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