Centrifugal spinning spinneret for producing parallel composite micro-nano fibers

Abstract

The invention relates to a centrifugal spinning technology, and aims to provide a centrifugal spinning spinneret for producing parallel composite micro-nano fibers. Comprising a round box body, a cavity dividing plate and a sealing cover, the upper part of the round box body is opened and is provided with a vertical hollow shaft sleeve; the sealing cover is annularly sleeved on the shaft sleeve; the cavity dividing plate is annular and is nested on the shaft sleeve in a boss structure, and the inner cavity of the round box body is divided into an upper storage cavity and a lower storage cavity; the side edge of the cavity dividing plate opposite to the spinning nozzle is provided with an acute-angle-shaped section, an inlet of the spinning channel is divided into an upper part and a lower part, and the upper side and the lower side of the inlet of the spinning channel are communicated with the upper material storage cavity and the lower material storage cavity respectively. According to the centrifugal spinning spinneret, the upper cavity and the lower cavity are divided, radial outflow is achieved, two jets in the same spinneret hole are always kept to be the same in stress and flow, and the proportion of parallel composite fibers formed in the spinning process is higher; the same charges do not repel each other among the fibers, so that the splitting phenomenon of jet flow in the composite fibers is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of centrifugal spinning, in particular to a centrifugal spinning spinneret for producing parallel composite micro-nano fibers. Background Art

[0002] Centrifugal spinning is a technology that uses a high-speed rotating spinneret to eject molten or dissolved polymers under the action of centrifugal force to form a jet, which is stretched and refined, accompanied by solvent volatilization and temperature reduction, and finally solidified to form micro-nano fibers. Compared with traditional micro-nano fiber manufacturing methods, centrifugal spinning has the following significant advantages: no high voltage field is required, there is no polarity requirement for raw materials, a wide range of applications, and high production efficiency. Therefore, centrifugal spinning has broad application prospects in the field of micro-nano fiber material processing.

[0003] Parallel composite micro-nano fibers can not only combine two materials with different properties to form composite fibers, but also flexibly integrate heterogeneous functionality according to application requirements. These advantages make parallel composite micro-nano fibers widely used in filter materials, medical and bioengineering, electronics and energy and other fields. At present, the preparation methods of parallel micro-nano fibers include melt-blowing, electrostatic spinning, jet spinning, microfluidic spinning and other methods. The preparation of parallel fibers by melt-blowing is mainly to melt two polymers separately through twin-screw extrusion, metering and then enter the parallel composite component. For example, Chinese patent CN107955982B discloses "a method for preparing a PLA / PET parallel composite fiber with moisture absorption and perspiration", PLA slices and PET slices are melted and extruded at high temperature by screws at low temperature, metered and then enter the parallel composite component for parallel composite distribution, and the parallel composite fibers coming out of the spinneret are oiled, wound and pulled, and silked after air cooling, and then stretched in an oil-immersed water bath, steam stretched, oiled and cooled, and heat-set to obtain a PLA / PET parallel composite fiber with moisture absorption and perspiration. However, due to the use of twin-screw extruder equipment, the preparation of parallel composite fibers by melt-blowing has the problems of high energy consumption and relatively thick fibers. The production of parallel composite micro-nano fibers by electrospinning has also received widespread attention. For example, Chinese patent CN107236997A discloses "an electrospinning method for batch preparation of parallel composite structure nanofibers", which uses the slit between two liquid reservoirs and a strip spinneret to make the spinning solution converge above the spinneret to form a composite layer separated on both sides. The spinning solution on both sides of the spinning solution produces unstable fluctuations under the action of a high-voltage electrostatic field, thereby realizing the batch production of parallel composite structure nanofibers. However, in the process of electrospinning to produce parallel micro-nano fibers, the two spinning solutions will carry the same charge and have repulsion, which can easily destroy its parallel structure, and the production efficiency is low.

[0004] In the existing open literature, there is no technology that can realize parallel composite fiber by only modifying the spinneret structure. In the traditional spinneret structure (such as CN107236997B), due to the use of a split-chamber design, the two polymer fluids of the same outlet are subjected to different forces, which further causes different flows, thereby reducing the spinning parallel rate. In addition, since the flow channel of the traditional spinneret is too long, the polymers in the two spinning solutions are easily mixed after ejection, making the interface between the fibers unclear or even fused into one fiber, resulting in a low ratio of parallel composite micro-nano fibers.

[0005] In view of the above problems, the present invention proposes a centrifugal spinning spinneret, which aims to achieve the successful preparation of parallel composite micro-nano fibers by optimizing the spinneret design, thereby improving the performance and application range of fiber products. Summary of the invention

[0006] The technical problem to be solved by the present invention is to overcome the deficiencies in the prior art and provide a centrifugal spinning spinneret for producing parallel composite micro-nano fibers.

[0007] To achieve the above object, the present invention provides the following solutions:

[0008] Provided is a centrifugal spinning spinneret for producing parallel composite micro-nano fibers, comprising a round box body, a cavity plate and a sealing cover; wherein:

[0009] The round box body is open at the top, and a vertical hollow sleeve is provided in the center of the inner part thereof, and an annular step is provided between the outer side of the sleeve and the bottom of the round box body; at least one pair of spinnerets is embedded in the side wall of the round box body, and each pair of spinnerets is symmetrically arranged around the center of the round box body, and the spinnerets and the side wall of the round box body are connected by a radial spinning channel;

[0010] The sealing cover is in the shape of a ring, and the circular hole in the center of the sealing cover is sleeved on the shaft sleeve; the edge of the sealing cover is seated on the edge of the opening of the round box body, and is sealed;

[0011] The main body of the dividing chamber plate is in the shape of a circular ring, and an annular boss structure is provided at the center position of its upper surface; the boss structure is nested and installed on the shaft sleeve, and its bottom edge is seated on the annular step of the circular box body; the upper edge of the boss structure of the dividing chamber plate cooperates with the annular concave structure on the lower surface of the sealing cover to achieve sealing; the outer edge of the dividing chamber plate and the inner wall of the circular box body are tightly matched to achieve sealing, and the inner cavity of the circular box body is divided into an upper storage cavity and a lower storage cavity by the dividing chamber plate; at a position opposite to the spinneret, the side edge of the dividing chamber plate maintains a distance from the entrance of the spinneret channel to form a channel; and the side edge of the dividing chamber plate at this position has an acute-angled cross-section, which divides the entrance of the spinneret channel into an upper and lower part, so that the upper and lower sides of the entrance of the spinneret channel are respectively connected to the upper storage cavity and the lower storage cavity;

[0012] At least two feeding holes connected to the upper material storage cavity are arranged on the sealing cover; at least two vertical feeding channels are arranged along the shaft sleeve, one end of which is opened at the top of the shaft sleeve for feeding, and the other end is connected to the lower material storage cavity.

[0013] As a preferred solution of the present invention, the geometric centers of the circular box body, the cavity plate and the sealing cover are all located on the central axis of the sleeve, and the shapes of all cross sections are centrally symmetrical.

[0014] As a preferred embodiment of the present invention, at least two groups of evenly arranged circumferentially arranged interlocking parts are provided on the cavity plate and the circular box body, including a protrusion provided on the edge of the cavity plate and a concave structure provided on the inner wall of the circular box body; the interlocking parts are used to achieve circumferential positioning between the cavity plate and the circular box body; the cavity plate is tightly installed between the annular step of the circular box body and the annular concave structure of the sealing cover with its annular boss structure, so as to achieve axial positioning between the cavity plate and the circular box body and the sealing cover.

[0015] As a preferred embodiment of the present invention, except for the part connected to the spinneret, the outer edge of the cavity plate has a vertical side surface and fits with the vertical side wall of the round box body; the inner edge of the cavity plate has a vertical side surface and fits with the vertical outer edge of the sleeve.

[0016] As a preferred embodiment of the present invention, a coaxial feeding pipe is sleeved on the outside of the sleeve, the feeding pipe and the sleeve are connected by at least two partitions, and the partitions separate the cavity between the two to form the vertical feeding channel; alternatively, two split independent feeding pipes are fixedly arranged on the outside of the sleeve.

[0017] As a preferred embodiment of the present invention, the sealing cover is embedded in the edge of the upper opening of the round box body; or, the sealing cover is attached to the upper part of the round box body and fixed with multiple quick-release buckles; or, the sealing cover is attached to the upper part of the round box body and fixed to the edge of the upper opening of the round box body with multiple screws.

[0018] As a preferred solution of the present invention, a through hole is opened on the side wall of the round box body and an internal thread is provided. The spinneret has a matching external thread, and the spinneret is installed on the side wall of the round box body by screw connection.

[0019] As a preferred solution of the present invention, a through hole is opened on the side wall of the round box body and an internal thread is provided, and a Luer adapter is used in combination with a dispensing needle to replace the spinneret.

[0020] As a preferred solution of the present invention, the central through hole of the sleeve cooperates with the driving shaft of the spinning machine, and the two are fixedly connected by threaded connection or key connection.

[0021] As a preferred embodiment of the present invention, the diameter of the spinning solution injection hole is 2 mm, and the hole length of the spinneret is 5 to 10 mm.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] (1) Since the centrifugal spinning spinneret of the present invention has upper and lower chambers and radial outflow, the two jets in the same spinneret hole always maintain the same force and flow rate; therefore, the proportion of parallel composite fibers formed during the spinning process is higher; especially for polymers with good fluidity, the effect is more obvious.

[0024] (2) Since the centrifugal spinning spinneret of the present invention has the characteristic of expandable number of spinnerets, the micro-nano fibers prepared by the device have a higher output per unit time.

[0025] (3) During the spinning process, since no voltage is applied, the jet will not generate static electricity, so there is no mutual repulsion between fibers with the same charges, and the jet splitting phenomenon in the composite fiber will not occur.

[0026] (4) The centrifugal spinning spinneret of the present invention has a simple structure and is detachable, which is more convenient for processing and cleaning;

[0027] (5) The design of the replaceable spinneret can adjust the flow channel length at any time according to the process requirements, reducing the probability of the two polymers merging into a fiber without obvious boundaries in the flow channel due to the flow channel being too long. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural exploded view of the present invention.

[0029] Figure 2 It is a top view of the lower storage chamber of the spinneret.

[0030] Figure 3 It is a top view of the chamber plate of the spinneret.

[0031] Figure 4 It is a bottom view of the sealing cover of the spinneret.

[0032] Figure 5 It is a schematic diagram of the spinneret after longitudinal section along the axis where the external spinning solution injection hole is located.

[0033] Figure 6 It is a schematic diagram of the spinneret after longitudinal section along the axis where the internal spinning solution injection hole is located.

[0034] Figure 7 This is a SEM image of the parallel PVP nanofibers produced using the spinneret of the present invention in Example 1.

[0035] Figure 8 This is a schematic diagram of the structure of the centrifugal spinning spinneret used in the prior art CN107236997B.

[0036] Description of the reference numerals: sealing cover 1, cavity plate 2, round box body 3, spinneret 4, injection hole 5. DETAILED DESCRIPTION

[0037] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0038] Part I Implementation of the Invention

[0039] like Figure 1-6 As shown, the centrifugal spinning spinneret of the present invention comprises a circular box body 3, a cavity plate 2 and a sealing cover 1 arranged in sequence from bottom to top. The circular box body 3 is open at the top, and a vertical hollow sleeve is provided in the center of the interior thereof, and an annular step is provided between the outer side of the sleeve and the bottom of the circular box body; at least one pair of spinnerets 4 is embedded in the side wall of the circular box body 3, and each pair of spinnerets 4 is arranged symmetrically with respect to the center of the circular box body 3, and the spinnerets 4 and the side wall of the circular box body 3 are connected by a radial spinning channel. The sealing cover 1 is in the shape of a circular ring, and the circular hole in the center thereof is sleeved on the sleeve; the edge of the sealing cover 1 is seated on the edge of the opening of the circular box body 3, and is sealed. The main body of the cavity plate 2 is in the shape of a circular ring, and an annular boss structure is provided at the center of its upper surface; the boss structure is nested and installed on the sleeve, and its bottom edge is seated on the annular step of the circular box body 3. The upper edge of the boss structure of the cavity plate 2 cooperates with the annular concave structure on the lower surface of the sealing cover 1 to achieve sealing. The outer edge of the cavity plate 2 is tightly matched with the inner wall of the round box body 3 to achieve sealing, and the cavity plate 2 divides the inner cavity of the round box body 3 into an upper storage cavity and a lower storage cavity; at a position opposite to the spinneret 4, the side edge of the cavity plate 2 is spaced from the inlet of the spinneret channel to form a channel; and the side edge of the cavity plate at this location has an acute-angled cross-section, which divides the inlet of the spinneret channel into an upper and lower part, so that the upper and lower sides of the inlet of the spinneret channel are respectively connected to the upper storage cavity and the lower storage cavity (such as Figure 5 , 6 As shown). On the sealing cover 1, at least two feeding holes 5 are provided which are connected to the upper storage chamber. Two or more feeding holes can be used to balance the air pressure in the storage chamber when feeding, so as to avoid feeding difficulties. At least two vertical feeding channels are provided along the sleeve, one end of which is opened at the top of the sleeve for feeding, and the other end is connected to the lower storage chamber.

[0040] Furthermore, the geometric centers of the round box body 3, the chamber plate 2 and the sealing cover 1 are all located on the central axis of the sleeve, and the shapes of all cross sections are centrally symmetrical. Such a design can ensure that the spinneret always maintains stable operation during high-speed rotation, creating conditions for smoothly realizing parallel spinning.

[0041] like Figure 2 ,3 As shown, at least two groups of evenly arranged circumferentially arranged interlocking parts are provided on the cavity plate 2 and the round box body 3, including a protrusion provided on the edge of the cavity plate 2 and a concave structure provided on the inner wall of the round box body 3; the interlocking parts are used to achieve circumferential positioning between the cavity plate 2 and the round box body 3. The cavity plate 2 is tightly installed between the annular step of the round box body 3 and the annular concave structure of the sealing cover 1 with its annular boss structure, so as to achieve axial positioning between the cavity plate 2 and the round box body 3 and the sealing cover 1. Based on these two groups of concave-convex matching relationships, the cavity plate 2 can be double-fitted when it is installed in the round box body 3, and circumferential or axial displacement and loosening can be avoided at the same time.

[0042] The present invention uses a precision machining method to achieve sealing isolation. Figure 5 , 6 As shown, except for the portion connected to the spinneret 4, the outer edge of the cavity plate 2 has a vertical side surface and fits with the vertical side wall of the round box body 3; the inner edge of the cavity plate 2 has a vertical side surface and fits with the vertical side wall of the sleeve.

[0043] The present invention adopts a sleeve structure to realize the feeding pipe design of the lower storage cavity. A coaxial feeding pipe is sleeved on the outside of the sleeve, and a plurality of partitions are used to connect the feeding pipe and the sleeve, so as to separate the cavity between the two to form a vertical feeding channel. As an alternative, two separate independent feeding pipes can be fixedly arranged on the outside of the sleeve.

[0044] There are many ways to fix the sealing cover 1. For example, the sealing cover 1 is embedded in the edge of the upper opening of the round box body, and the sealing is achieved by fine processing. Alternatively, the sealing cover 1 is attached to the upper part of the round box body 3 and fixed with multiple quick release buckles, and a sealing gasket is used to achieve sealing when necessary. Alternatively, the sealing cover 1 is attached to the upper part of the round box body 3, and the sealing cover 1 is fixed to the edge of the upper opening of the round box body 3 with multiple screws, and a sealing gasket is used to achieve sealing when necessary.

[0045] The installation of the spinneret 4 can be done in a conventional manner. For example, a through hole is opened on the side wall of the round box body 3 and an internal thread is set, and the spinneret 4 has a matching external thread and is installed on the side wall of the round box body 3 by screw connection. Alternatively, a through hole is opened on the side wall of the round box body 3 and an internal thread is set, and the spinneret 4 is replaced by a Luer adapter and a dispensing needle.

[0046] As a rotating device, the spinneret cooperates with the driving shaft of the spinning machine through the central through hole of the shaft sleeve, and the two can be fixedly connected by threaded connection or key connection.

[0047] As a preferred embodiment of the present invention, the diameter of the spinning solution injection hole is 2 mm, and the hole length of the spinneret is 5 to 10 mm.

[0048] The processing materials of the various parts of the spinneret can be selected from stainless steel, aluminum alloy, copper, PETG, PLA, ABS, PA12-CF, TPU, etc. When in use, different spinning solutions are added to the upper storage chamber and the lower storage chamber of the spinneret according to the process requirements, and the viscosity requirements of the spinning solution are basically the same as those of the single-chamber spinneret in conventional technology.

[0049] Part II Specific Application Examples

[0050] like Figure 1 As shown, the spinneret structure in this example is basically the same as described in the first part. The spinneret comprises a round box body 3, a cavity plate 2 and a sealing cover 1 arranged from bottom to top. The inner cavity of the round box body 3 is used to provide a material storage space and set a hollow sleeve, and the cavity plate 2 divides the interior of the round box body 3 into an upper material storage cavity and a lower material storage cavity that are independent and non-connected.

[0051] like Figure 5 , 6 As shown, as an original design of the present invention, the edge of the cavity plate 2 facing the spinneret 4 has a different cross-sectional shape from other edge positions; the former is an acute angle used to separate the spinneret 4's spinneret channel entrance, ensuring that the two storage chambers can be fed synchronously and separately; the latter is used to cooperate with the inner wall of the round box body 3 to achieve a sealed fit between the finely processed parts. It can be understood that: most of the edges of the cavity plate 2 are sealed with the round box body 3; but the inner wall of the round box body 3 at the spinneret 4 position has an inward-retracted structure, and the edge of the cavity plate 2 opposite to it has a sharp protruding edge, and the two cooperate to form a discharge channel that simultaneously connects the upper and lower storage chambers and the spinneret 4.

[0052] An M6 threaded hole is opened on the side wall of the round box body 3 corresponding to the spinneret channel for the installation of the detachable spinneret 4; for example, a spinneret with a 0.2mm spinneret channel can be used, or a Luer adapter can be used with a 20-30G dispensing head. The shaft sleeve through hole inside the round box body 3 has a diameter of 6mm, and a 1mm thick 5mm diameter reducing hole is set at the bottom, which is fixed with a nut after being installed in conjunction with the shoulder of the motor shaft.

[0053] like Figure 4 As shown, the sealing cover 1 is provided with a plurality of injection holes 5 for injecting spinning solution. The injection holes 5 are divided into an outer circle hole and an inner circle hole, which are respectively used for adding liquid to the upper storage chamber and the lower storage chamber. The geometric centers of the sections of the sealing cover 1, the lower storage chamber 3, and the cavity plate 2 are all on the same axis, which can ensure smooth operation when the motor drives the spinneret to rotate at high speed.

[0054] When the present invention is applied to spinning, the spinneret is fixed on the motor shaft; then, different spinning solutions are injected into the two storage chambers through the injection hole 5 using a syringe for centrifugal spinning. During the spinning process, the discharge of the upper storage chamber and the lower storage chamber enters the spinneret 4 from the upper and lower parts of the inlet of the spinneret channel respectively under the isolation effect of the dividing chamber plate 2, through the centrifugal force. Since the spinneret channel is short (usually less than 20mm) and the ejection process is extremely fast, even if the two spinning solutions have adjacent interfaces in the spinneret channel, deep mixing is usually not achieved. Therefore, the two spinning solutions can smoothly spun out in parallel after passing through the spinneret 4. And due to the adjacent feeding and discharging, the parallel spinning can keep the boundary between the two fibers clear and will not cause jet splitting. Finally, parallel composite fibers are obtained.

[0055] Example 1

[0056] (1) Weigh a certain amount of polyvinyl pyrrolidone (PVP), add it to anhydrous ethanol to prepare a solution with a mass fraction of 10%, and stir it continuously at room temperature for 8 hours to obtain a spinning solution.

[0057] (2) Centrifugal spinning parameters: A dispensing needle with a diameter of 25G and a needle length of 12mm was selected as the nozzle, and connected to the spinneret with a Luer adapter. The collection method selected was annular collection, and the distance from the nozzle to the collector was set to 80mm. 4mL of spinning solution was injected into the spinneret through the spinning solution injection hole 5 on the sealing cover with a syringe for centrifugal spinning test, wherein the rotation speed was set to 1500rpm and the ambient humidity was maintained at 20±5%.

[0058] (3) The prepared fibers are dried in a forced air oven at 50°C to obtain PVP / PVP micro-nano parallel fibers.

[0059] Example 2

[0060] (1) Weigh a certain amount of vinylidene fluoride-hexafluoropropylene copolymer (PVDF-HFP), add it to a mixed solvent of N,N-dimethylformamide (DMF) / acetone (weight 1 / 1), prepare a solution with a mass fraction of 16%, and stir it continuously at room temperature for 24 hours to obtain a spinning solution. Weigh a certain amount of polyimide (PI), add it to N,N-dimethylformamide (DMF), prepare a solution with a mass fraction of 15%, and stir it continuously at room temperature for 8 hours to obtain a spinning solution.

[0061] (2) Centrifugal spinning parameters: A dispensing needle with a diameter of 27G and a needle length of 12mm was selected as the nozzle, and connected to the spinneret with a Luer adapter. The collection method selected was annular collection, and the distance from the nozzle to the collector was set to 120mm. Two syringes were used to inject 4mL of each spinning solution into the spinneret through the spinning solution injection hole 5 on the sealing cover for centrifugal spinning experiments, wherein the rotation speed was set to 2000rpm and the ambient humidity was maintained at 40±5%.

[0062] (3) The prepared fibers are dried in a forced air oven at 60°C to obtain PVDF / PI micro-nano parallel fibers.

[0063] Example 3

[0064] (1) Weigh a certain amount of polyvinyl pyrrolidone (PVP), add it to anhydrous ethanol, prepare a solution with a mass fraction of 10%, and stir it continuously at room temperature for 8 hours to obtain a spinning solution. Weigh a certain amount of polyacrylonitrile (PAN), add it to N, N-dimethylformamide (DMF), prepare a solution with a mass fraction of 15%, and stir it continuously at 50°C for 12 hours to obtain a spinning solution.

[0065] (2) Centrifugal spinning parameters: A dispensing needle with a diameter of 25G and a needle length of 12mm was selected as the nozzle, and connected to the spinneret with a Luer adapter. The collection method selected was annular collection, and the distance from the nozzle to the collector was set to 80mm. Two syringes were used to inject 4mL of each spinning solution into the spinneret through the spinning solution injection hole 5 on the sealing cover for centrifugal spinning experiments, wherein the rotation speed was set to 1500rpm and the ambient humidity was maintained at 20±5%.

[0066] (3) The prepared fibers are dried in a forced air oven at 50°C to obtain PVP / PAN micro-nano parallel fibers.

[0067] After careful inspection of the fiber products obtained in multiple embodiments, the proportion of parallel composite micro-nano fibers is basically maintained at more than 95%, and can maintain the parallel form continuously and stably. Among them, the proportion of separated or fused fibers is basically less than 5%.

[0068] Figure 7 The SEM image of the micro-nano parallel fibers of Example 1 shows that the fibers are basically in parallel form. Note: Since the fiber directions in the product are random, some of the parallel fibers appear as single fibers when viewed from the side.

Claims

1. A centrifugal spinning spinneret for producing parallel composite micro-nano fibers, characterized in that: It includes a round box body, a chamber plate and a sealing cover; wherein, The round box body is open at the top, and a vertical hollow sleeve is provided in the center of the inner part thereof, and an annular step is provided between the outer side of the sleeve and the bottom of the round box body; at least one pair of spinnerets is embedded in the side wall of the round box body, and each pair of spinnerets is symmetrically arranged around the center of the round box body, and the spinnerets and the side wall of the round box body are connected by a radial spinning channel; The sealing cover is in the shape of a ring, and the circular hole in the center thereof is sleeved on the shaft sleeve; the edge of the sealing cover is seated on the edge of the opening of the round box body, and is in a sealing fit; The main body of the dividing chamber plate is in the shape of a circular ring, and an annular boss structure is provided at the center position of its upper surface; the boss structure is nested and installed on the shaft sleeve, and its bottom edge is seated on the annular step of the circular box body; the upper edge of the boss structure of the dividing chamber plate cooperates with the annular concave structure on the lower surface of the sealing cover to achieve sealing; the outer edge of the dividing chamber plate and the inner wall of the circular box body are tightly matched to achieve sealing, and the inner cavity of the circular box body is divided into an upper storage cavity and a lower storage cavity by the dividing chamber plate; at a position opposite to the spinneret, the side edge of the dividing chamber plate maintains a distance from the entrance of the spinneret channel to form a channel; and the side edge of the dividing chamber plate at this position has an acute-angled cross-section, which divides the entrance of the spinneret channel into an upper and lower part, so that the upper and lower sides of the entrance of the spinneret channel are respectively connected to the upper storage cavity and the lower storage cavity; At least two feeding holes connected to the upper material storage cavity are arranged on the sealing cover; at least two vertical feeding channels are arranged along the shaft sleeve, one end of which is opened at the top of the shaft sleeve for feeding, and the other end is connected to the lower material storage cavity.

2. The centrifugal spinning spinneret according to claim 1, characterized in that The geometric centers of the circular box body, the cavity plate and the sealing cover are all located on the central axis of the sleeve, and the shapes of all cross sections are centrally symmetrical.

3. The centrifugal spinning spinneret according to claim 1, characterized in that: At least two groups of evenly arranged circumferentially arranged interlocking parts are provided on the cavity plate and the circular box body, including a protrusion provided on the edge of the cavity plate and a concave structure provided on the inner wall of the circular box body; the interlocking parts are used to achieve circumferential positioning between the cavity plate and the circular box body; the cavity plate is tightly installed between the annular step of the circular box body and the annular concave structure of the sealing cover with its annular boss structure, so as to achieve axial positioning between the cavity plate, the circular box body and the sealing cover.

4. The centrifugal spinning spinneret according to claim 1, characterized in that: Except for the part connected with the spinneret, the outer edge of the cavity plate has a vertical side surface and fits with the vertical side wall of the round box body; the inner edge of the cavity plate has a vertical side surface and fits with the vertical outer edge of the sleeve.

5. The centrifugal spinning spinneret according to claim 1, characterized in that: A coaxial feeding pipe is sleeved outside the sleeve, the feeding pipe and the sleeve are connected by at least two partitions, and the partitions separate the cavity between the two to form the vertical feeding channel; or, two separate separate feeding pipes are fixedly arranged outside the sleeve.

6. The centrifugal spinning spinneret according to claim 1, characterized in that: The sealing cover is embedded in the edge of the upper opening of the round box body; or, the sealing cover is attached to the upper part of the round box body and fixed with multiple quick-release buckles; or, the sealing cover is attached to the upper part of the round box body and fixed to the edge of the upper opening of the round box body with multiple screws.

7. The centrifugal spinning spinneret according to claim 1, characterized in that: A through hole is opened on the side wall of the round box body and an internal thread is arranged. The spinneret has a matching external thread, and the spinneret is installed on the side wall of the round box body by screw connection.

8. The centrifugal spinning spinneret according to claim 1, characterized in that: A through hole is opened on the side wall of the round box body and an internal thread is arranged, and a Luer adapter is used in combination with a dispensing needle to replace the spinneret.

9. The centrifugal spinning spinneret according to claim 1, characterized in that: The central through hole of the shaft sleeve is matched with the driving shaft of the spinning machine, and the two are fixedly connected by threaded connection or key connection.

10. The centrifugal spinning spinneret according to claim 1, characterized in that: The diameter of the spinning solution injection hole is 2 mm, and the length of the spinneret hole is 5 to 10 mm.

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