A spinning device and method for continuous hydrogel fibers with controllable fineness

Abstract

The application discloses a spinning device and method of continuous hydrogel fiber with controllable fineness, and belongs to the field of textile materials. The application can macroscopically prepare small-diameter hydrogel fibers by fluid flexible drafting, and realizes continuous processing of the hydrogel fibers. In the spinning process, the spinning dope is quickly cross-linked and solidified in the circulating coagulation bath solution to form the hydrogel fiber; at the same time, the hydrogel fiber is flexibly drafted by the shearing tensile force generated by the relatively parallel flow of the coagulation bath solution in the circulating pipeline. The flexible drafting method does not damage the internal structure and surface morphology of the hydrogel fiber, and can significantly reduce the diameter of the hydrogel fiber. The application can continuously and efficiently prepare the hydrogel fiber with controllable diameter, uniform thickness and consistent performance, and different-diameter hydrogel fibers can be prepared by adjusting process parameters such as fluid velocity, coagulation bath concentration and spinning liquid concentration, and the application has great industrial application prospect.

Description

Technical Field

[0001] This invention relates to a spinning apparatus and method for continuous hydrogel fibers with controllable fineness, belonging to the field of textile materials. Background Technology

[0002] Hydrogels are polymer materials formed by the cross-linking of hydrophilic polymer chains in water to create a three-dimensional network structure. Due to the large amount of water contained in the system, hydrogels exhibit excellent softness, elasticity, and good biocompatibility.

[0003] Hydrogel fibers possess both the performance characteristics of hydrogels (high water content, high porosity, high elasticity, and responsiveness) and the structural advantages of fibrous materials (high specific surface area, easy weaving, and good mechanical properties). The high specific surface area of ​​hydrogel fibers gives them better hygroscopicity, moisture retention, and breathability. Hydrogel fibers can be sized to mimic the microfiber structure of human tissues, such as nerve cells, muscle fibers, tendons, and ligaments. Hydrogel fibers can also be processed into textile materials for application in the biomedical field using textile processing techniques such as knitting, weaving, braiding, and nonwovens. Furthermore, the one-dimensional fiber structure can be easily fabricated into 3D materials for application in human tissue engineering.

[0004] Currently reported methods for preparing hydrogel fibers include electrospinning, pregel solution drawing, solution jet spinning, mold method, 3D printing, wet spinning, dynamic polymerization, and UV rapid polymerization. All of these methods have limitations. Electrospinning and solution jet spinning produce hydrogel nanofibers with structures and functions similar to the extracellular matrix, showing great promise for applications in tissue engineering scaffolds or drug delivery. However, electrospinning and solution jet spinning suffer from slow production speeds and the need to add spinning aids to some systems (NPG Asia Materials, 2022, 14(1):20). Pregel solution drawing involves drawing uniformly thick hydrogel fibers from a gel solution; this method is simple, but it has certain requirements on the viscosity of the spinning solution and the molecular weight of the polymer (Nature Communications, 2018, 9(1):3579). The fiber length prepared by the template method is limited by the mold size and has difficulties in continuous processing (Advanced Materials, 2015, 27, 4081-4086). 3D printing relies on advanced spinning equipment and is difficult to mass-produce hydrogel fibers (Biotechnology Journal, 2017, 12, 1600671.); dynamic polymerization is limited by uncontrollable thermally initiated free radical reactions, resulting in a short spinning range (CN201911071224.0); UV rapid polymerization results in poor mechanical properties due to the non-uniform network formed by rapid polymerization and has a complex operation process (CN105155011B, CN105133065B, CN106243296B); wet spinning requires careful design of polymer raw materials and coagulation baths, resulting in poor versatility (Advanced Materials, 2020, 32, 1906994.), and existing wet spinning equipment also suffers from problems such as difficulty in continuous production, inconvenient fineness control, and poor versatility. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a spinning apparatus and method for continuous hydrogel fiber spinning with controllable fineness. It utilizes fluid flexible stretching to prepare small-diameter hydrogel fibers in large quantities and enables continuous processing. During spinning, the spinning solution rapidly cross-links and solidifies in a circulating coagulation bath solution to form hydrogel fibers. Simultaneously, the shear and tensile forces generated by the relatively parallel flow of the coagulation bath solution in the circulating pipes flexibly stretch the hydrogel fibers. This flexible stretching method does not damage the internal structure and surface morphology of the hydrogel fibers and can significantly reduce their diameter. This apparatus and method can continuously and efficiently prepare hydrogel fibers with controllable diameter, uniform thickness, and consistent performance. Furthermore, by adjusting process parameters such as fluid velocity, coagulation bath concentration, spinning solution concentration, spinning speed, and capillary spinneret inner diameter, hydrogel fibers of different diameters can be prepared, demonstrating significant potential for industrial application.

[0006] The first objective of this invention is to provide a spinning apparatus for continuous hydrogel fibers with controllable fineness, characterized by comprising a spinning mechanism, a fluid circulation coagulation and drawing mechanism, a fiber dynamic collection mechanism, and a control system; wherein, the spinning mechanism is used to mix and store the spinning solution and extrude the spinning solution into the fluid circulation coagulation and drawing mechanism to form hydrogel fibers in a coagulation bath solution, the spinning mechanism including a spinneret having multiple capillary spinnerets; the fluid circulation coagulation and drawing mechanism is used to flexibly draw the formed hydrogel fibers and solidify them; the fiber dynamic collection mechanism is used to rapidly collect the solidified continuous hydrogel fibers and wind them into a shaft; the control system is used to control the extrusion speed of the spinning solution, the flow rate of the coagulation bath solution, and the winding speed of the hydrogel fibers in each component of the fiber dynamic collection mechanism;

[0007] In one embodiment, the fluid circulation coagulation and drawing device includes a fluid drive assembly and a coagulation bath. The fluid drive assembly includes a coagulation bath drawing pipe, a flow meter, a pressure gauge, a first feed pump, and a filter screen. The inlet of the first feed pump is connected to the coagulation bath and is equipped with a filter screen. The first feed pump is connected to the drawing pipe. The drawing pipe is an L-shaped pipe, with the lower end of its vertical section connected to the upper outlet of the feed pump. The horizontal section of the drawing pipe is located above the coagulation bath and is connected to the spinneret. A flow meter and a pressure gauge are sequentially installed on the drawing pipe, and a fiber outlet is provided at the end of the coagulation bath drawing pipe.

[0008] In one embodiment, the spinning mechanism includes a raw material tank and a solution extrusion device connected thereto. The solution extrusion device includes a second liquid supply pump, a filter screen, a metering pump, a liquid distribution device, and a spinneret. One end of the second liquid supply pump is connected to the raw material tank, and the other end is connected to the metering pump. A filter screen is provided between the raw material tank and the metering pump. The metering pump is connected to the liquid distribution device, and the liquid distribution device is connected to the spinneret.

[0009] In one embodiment, the solution extrusion device includes a microsyringe and a spinneret. The microsyringe includes a microinjection pump, a syringe, and an injection tube, wherein the microinjection pump is connected to the syringe to provide pressure, and the injection tube is connected to the spinneret.

[0010] In one embodiment, the spinneret is a cylindrical capillary needle spinneret device, including a liquid inlet, a capillary spinneret, a fluid chamber, and a pipe connector. The liquid inlet is connected to a liquid distribution device, the capillary spinneret is connected to the liquid inlet, and both ends of the pipe connector are connected to the drawing pipe. The number of capillary spinnerets is 1 to 10,000.

[0011] In one embodiment, the angle between the capillary spinneret and the axial direction of the coagulation bath drawing pipe is 0 to 180°, and can be either co-current, vertical, or counter-current.

[0012] In one embodiment, the spinneret includes circumferentially arranged annular spinnerets, triangular spinnerets, square spinnerets, and polygonal spinnerets; and axially arranged linear spinnerets and corner spinnerets.

[0013] In one embodiment, the fiber dynamic collection mechanism includes: a drive and transmission unit, a collection unit, and a stabilizing bath; the drive and transmission unit includes a drive motor, a transmission chain, transmission gears, a collection screen, a drive shaft, and three driven shafts, wherein the drive motor directly drives the drive shaft and the collection screen to rotate, and the drive shaft drives the stripping shaft to rotate via the transmission chain; the stripping shaft and the fiber guiding shaft are connected via the transmission chain; the fiber guiding shaft and the winding shaft are connected via the transmission chain; the collection screen, the drive shaft, and the three driven shafts are placed in the coagulation bath; the fiber guiding shaft and the winding shaft are placed in the stabilizing bath.

[0014] In one embodiment, the active shaft and the collecting screen move synchronously in the fiber dynamic collection mechanism. The prepared hydrogel fiber is sent out through the coagulation and stretching pipe and then held by the collecting screen. The fiber is then conveyed to the active shaft through the driven shaft. The peeling shaft peels the fiber from the collecting screen and it falls into the stabilizing bath. The fiber is then conveyed sequentially through the support screen to the guide shaft, the first winding shaft, the second winding shaft, and finally wound and collected by the third winding shaft.

[0015] In one embodiment, the fiber dynamic collection mechanism further includes a pressing screen and a supporting screen. The pressing screen is located above the collecting screen; the supporting screen is located above the collection unit; the solution extrusion device pushes the spinning solution out of the spinneret, injects it into the drawing pipe, and drops it into the coagulation bath. The drive shaft drives the driven shaft to bring the fiber into the collecting screen. In order to prevent the high-speed water flow from causing irregular entanglement of the fiber, the pressing screen above the collecting screen applies gentle pressure to the fiber, forcing the fiber to pass forward in a parallel state; the peeling shaft then peels the fiber from the collecting screen to the supporting screen, where it falls into the stabilization bath. The supporting screen is installed above the supporting screen to coordinate the forward transmission of the fiber. The fiber guide shaft then collects the fiber sequentially through the winding shaft.

[0016] In one embodiment, the control system includes a drafting fluid control module, an extrusion mechanism control module, a fiber dynamic collection mechanism control module, and a main power control module. The drafting fluid control module includes a drafting switch, a flow rate adjustment knob, and a flow rate display. The drafting switch controls the working state of the fluid circulation coagulation drafting mechanism. When activated, the first feed pump starts working, drawing the coagulation bath solution from the coagulation bath tank into the drafting pipe. The coagulation bath solution flows back to the coagulation bath tank after passing through the drafting pipe. The flow rate adjustment knob adjusts the flow rate of the coagulation bath solution in the drafting pipe, and the flow rate display shows the flow rate of the coagulation bath solution. The extrusion mechanism control module includes a feed pump switch, a flow rate adjustment knob, and a flow rate display. The system includes a pump switch, a feed speed control knob, and a feed flow rate display. The feed pump switch controls the start and stop of the second feed pump, the flow pump switch controls the metering pump, the feed speed control knob controls the extrusion speed of the spinning solution, and the feed flow rate display shows the flow rate of the spinning solution. The fiber dynamic collection mechanism control module includes a collection switch, a speed adjustment knob, an emergency stop button, and a speed display. The collection switch controls the opening and closing of the fiber dynamic collection mechanism, the speed adjustment knob adjusts the speed of the drive shaft, the emergency stop button stops the drive shaft, and the speed display shows the speed of the drive shaft. The main power control module includes a main power switch and a main machine emergency stop button.

[0017] In one embodiment, the fluid drive component is a pumping motor, the parameters of which are adjusted in the control system. The control system has a multi-functional display screen that can control fluid speed, mixing speed, extrusion speed, collection speed, stretching speed, stabilizing bath speed, etc.

[0018] In one embodiment, the drawing pipe includes a tangential bend joint, and a liquid inlet is provided in the upper section of the arc-shaped fluid cavity of the tangential bend joint. The liquid inlet is connected to an extended spinneret, which is connected to a liquid distribution device. The liquid inlet can be arranged in a straight line or in a ring. The spinning solution enters the drawing pipe through the extended spinneret, and the direction of the spinning solution injection is parallel to the flow direction of the coagulation bath solution.

[0019] In one embodiment, the fluid circulation coagulation and drawing mechanism further includes a third liquid supply pump, a four-way conversion joint, a first injection channel, a second injection channel, a third injection channel, and an improvement device; the inlet of the third liquid supply pump is connected to the coagulation bath, and the outlet is connected to the four-way conversion joint; the four-way conversion joint is connected to the first injection channel, the second injection channel, and the third injection channel respectively; the first injection channel, the second injection channel, and the third injection channel are connected to the circumferentially evenly distributed liquid inlets of the improvement device, the improvement device is axially connected to the drawing pipe, and the first injection channel, the second injection channel, and the third injection channel are respectively connected to the three capillary spinnerets of the spinneret; the third liquid supply pump injects the coagulation bath solution into the first injection channel, the second injection channel, and the third injection channel, and the spinneret injects the spinning solution evenly into the first injection channel, the second injection channel, and the third injection channel; the spinning solution is drawn in the first injection channel, the second injection channel, and the third injection channel to form hydrogel fibers, and the coagulation bath solution flowing in the drawing pipe drives the fibers to undergo preliminary twisting to form yarn.

[0020] The second objective of this invention is to provide a spinning method for mass production of hydrogel fibers with controllable fineness. The hydrogel fibers prepared using the above-mentioned equipment include the following steps:

[0021] (1) Dissolve natural polysaccharides, high molecular polymers or monomers in water to obtain spinning solution and inject it into the spinning mechanism; dissolve inorganic salts in water to obtain coagulation bath solution and inject it into the fluid circulation coagulation drawing mechanism;

[0022] (2) The spinning mechanism mixes the spinning solution evenly and injects it into the fluid circulation coagulation and stretching mechanism. The spinning solution is rapidly cross-linked and solidified in the coagulation bath solution of the fluid circulation coagulation and stretching mechanism to form hydrogel fiber.

[0023] (3) The hydrogel fibers are collected and wound by a fiber dynamic collection mechanism.

[0024] In one embodiment, the natural polysaccharide includes one or more of sodium alginate, hyaluronic acid, and chitosan derivatives; the polymer is one or more of carboxymethyl cellulose, carboxymethyl chitosan, carboxymethyl starch, gelatin, silk fibroin, polyvinyl alcohol, and polyethylene glycol; and the inorganic salt includes one of calcium chloride, ferric chloride, and zinc chloride.

[0025] In one embodiment, the solid content in the spinning solution is 1-40%, and the mass concentration of the coagulation bath is 0.2-20%.

[0026] In one embodiment, the inner diameter of the coagulation bath stretching pipe is 2-30 cm; the length of the fiber outlet pipe is 30-150 cm, and the inner diameter of the pipe is 2-30 cm.

[0027] In one embodiment, the fluid circulation speed is 0–100 m / s; the injection propulsion speed is 0.1–50 mL / min; the injection channel is 1–10000; and the inner diameter of the capillary spinneret is 20–500 μm.

[0028] A third objective of this invention is to provide a hydrogel fiber prepared using the aforementioned apparatus or method.

[0029] Compared with the prior art, the present invention has the following advantages:

[0030] (1) The present invention designs a spinning device for continuous hydrogel fibers with controllable fineness. Through the design of multiple spinnerets in the spinning mechanism and the corresponding fluid circulation coagulation and stretching device, the continuous mass production of hydrogel fibers can be realized. The device is simple, the speed of each component and the spinning parameters are easy to adjust, the controllability is high, the coagulation bath can be circulated and the cost is low, and the market prospects are broad.

[0031] (2) The fluid circulation coagulation and drawing device of the spinning apparatus for the fineness controllable continuous hydrogel fiber of the present invention has a liquid inlet in the upper section of the arc-shaped fluid cavity of the drawing pipe. The liquid inlet is connected to an extended spinneret. The spinning solution enters the drawing pipe through the extended spinneret. The direction of the spinning solution injection is parallel to the flow direction of the coagulation bath solution. Based on the elimination of the tangential force of the fluid side on the nascent fiber during the spinning process at the fiber outlet, the fiber entanglement can be reduced to a certain extent.

[0032] (3) The fiber dynamic collection mechanism of the present invention adopts a dynamic collection screen and a support screen. The speed of the collection screen is higher than the stretching speed of the coagulation bath solution, and the speed of the support screen is slightly lower than the stretching speed of the coagulation bath solution. The high-speed collection screen supports the hydrogel fiber for transport, which helps to prevent the fibers from tangling together and can further stretch the nascent fibers. The low-speed support screen can effectively prevent the fibers from reaching the stretching threshold and breaking off.

[0033] (4) The improved device of the present invention uses three injection channels arranged in the circumferential direction to draw hydrogel fibers in the spinning channel, and then uses the coagulation bath solution flowing in the drawing pipe to drive the fibers to perform preliminary twisting to form hydrogel yarn, thereby improving production efficiency. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of a hydrogel fiber spinning device.

[0035] Figure 2 This is a schematic diagram of one embodiment of the solution extrusion device 5.

[0036] Figure 3 This is a schematic diagram of a vertical spinneret device.

[0037] Figure 4 This is a schematic diagram of the needle angle for a vertical spinneret.

[0038] Figure 5 This is a schematic diagram of the spinneret shape.

[0039] Figure 6 This is a schematic diagram of the control system's user interface.

[0040] Figure 7 This is a schematic diagram of the improved drawing pipe 2 in Example 2.

[0041] Figure 8 Schematic diagram of the spinning apparatus for the improved hydrogel fiber in Example 3.

[0042] Figure 9 A physical diagram of the improved device 79 of Example 3.

[0043] Figure 10 Microscopic morphology of the hydrogel yarn prepared in Example 3.

[0044] Figure 11 This is a schematic diagram of the fiber dynamic collection transmission device in Example 4.

[0045] Figure 12 This is a microscopic morphology diagram of the hydrogel fibers prepared in Example 5.

[0046] Figure 13 This is a microscopic morphology diagram of the hydrogel fibers prepared in Example 6.

[0047] Figure 14 The tensile property curves are for the hydrogel fibers of Examples 6 and 5.

[0048] Figure 15 This is a microscopic morphology diagram of the hydrogel fibers prepared in Example 7.

[0049] Figure 16 This is a morphology diagram of the hydrogel nonwoven material in Example 8.

[0050] Figure 17 This is a microscopic morphology diagram of the hydrogel fibers prepared in Example 9.

[0051] Figure 18 The tensile property curves are those of the hydrogel fibers prepared in Example 9.

[0052] Figure 19 This is a microscopic morphology diagram of the hydrogel fibers prepared in Example 10.

[0053] Figure 20 The tensile property curves are those of the hydrogel fibers prepared in Example 10.

[0054] Figure 21This is a microscopic morphology diagram of the hydrogel fibers prepared in Example 11.

[0055] Figures 1-11 Component names:

[0056] 1. Fluid drive assembly; 2. Drawing pipe; 3. Spinneret; 4. Raw material tank; 5. Solution extrusion device; 6. Flow meter; 7. Pressure gauge; 8. Coagulation bath; 9. Collection screen; 10. Filter screen; 11. Collection unit; 12. Inlet; 13. Top outlet; 14. Control system; 15. Peeling shaft; 16. Fiber guide shaft; 17. Winding shaft; 18. Stabilizing bath; 19. Micro-syringe; 20. Syringe; 21. Injection tube; 22. First feed pump; 23. 24. Filter screen, metering pump, 25. Liquid distribution device, 26. Liquid inlet, 27. Pipe joint, 28. Capillary spinneret, 29. Fluid chamber, 30. First driven shaft, 31. Second driven shaft, 32. Third driven shaft, 33. Drive shaft, 35. First winding shaft, 36. Second winding shaft, 37. Drive motor, 38. Tractor curtain, 39. Drive chain, 40. Third liquid inlet pump, 41. Four-way adapter, 42. Draft fluid control module, 43. Extrusion mechanism control module, 4 4. Fiber collection mechanism control module; 45. Drafting switch; 46. Flow rate adjustment knob; 47. Flow rate display; 48. Feed pump switch; 49. Flow pump switch; 50. Feed speed control knob; 51. Feed flow rate display; 52. Collection switch; 53. Speed ​​adjustment knob; 54. Emergency stop button; 55. Speed ​​display; 56. Main power control module; 57. Main power switch; 58. Main machine emergency stop button; 59. Annular spinneret; 60. Linear spinneret; 61. Triangular spinneret. 62. Rectangular spinneret, 63. Polygonal spinneret, 64. Second liquid supply pump, 65. Corner spinneret, 66. Net pressing net curtain, 67. Net supporting net curtain, 68. Spinneret retainer, 69. Tangential spinneret, 70. Tangential bend connector, 71. Arc-shaped fluid cavity, 72. Extended spinneret needle, 73. Liquid supply hole, 74. Linear arrangement, 75. Annular arrangement, 76. First injection channel, 77. Second injection channel, 78. Third injection channel, 79. Improved device. Detailed Implementation

[0057] The preferred embodiments of the present invention are described below. It should be understood that the embodiments are for better explanation of the present invention and are not intended to limit the present invention.

[0058] Test method:

[0059] Mechanical property testing:

[0060] The mechanical properties of hydrogel fibers were tested using an XQ-2 fiber tensile strength tester under the following conditions: clamping distance 20 mm and tensile speed 10 mm / min.

[0061] Raw materials used in the examples:

[0062] Sodium alginate, chitosan, acetic acid, calcium chloride, anhydrous ethanol, and polyethylene glycol were purchased from Sinopharm Chemical Reagent Co., Ltd.

[0063] The silk was purchased from Suzhou Smet Biotechnology Co., Ltd.

[0064] Quercetin (98% purity), dopamine hydrochloride, polyethylene glycol diacrylate (PEGDA), and Irgacure 2959 were purchased from Maclean's Reagent Co., Ltd.

[0065] Example 1

[0066] This embodiment provides a spinning device for continuous hydrogel fibers with controllable fineness, see [link to documentation]. Figure 1 The system includes a spinning mechanism, a fluid circulation coagulation and drawing mechanism, a fiber dynamic collection mechanism, and a control system. The spinning mechanism includes a spinneret with multiple capillary spinnerets for mixing and storing the spinning solution and extruding it into the fluid circulation coagulation and drawing mechanism to form hydrogel fibers in a coagulation bath solution. The fluid circulation coagulation and drawing mechanism is used to flexibly draw the formed hydrogel fibers and solidify them. The fiber dynamic collection mechanism is used to rapidly collect the solidified continuous hydrogel fibers and wind them into a shaft. The control system controls the extrusion speed of the spinning solution, the flow rate of the coagulation bath solution, and the winding speed of the hydrogel fibers in each component of the fiber dynamic collection mechanism.

[0067] The fluid circulation coagulation and drawing device includes a fluid drive assembly 1 and a coagulation bath 8. The fluid drive assembly 1 includes a drawing pipe 2, a flow meter 6, a pressure gauge 7, a first feed pump 22, and a filter screen 10. The inlet 12 of the first feed pump 22 is connected to the coagulation bath 8, and the inlet 12 is equipped with a filter screen 10. The first feed pump 22 is connected to the drawing pipe 2. The drawing pipe 2 is an L-shaped pipe, and the lower end of its vertical section is connected to the upper outlet 13 of the first feed pump 22. The horizontal section of the drawing pipe 2 is located above the coagulation bath 8 and is connected to the spinneret. The flow meter 6 and the pressure gauge 7 are sequentially installed on the drawing pipe 2, and the fiber outlet is provided at the end of the coagulation bath drawing pipe 2.

[0068] The spinning mechanism includes a raw material tank 4 and a solution extrusion device 5 connected thereto. The solution extrusion device 5 includes a second liquid supply pump 64, a filter screen 23, a metering pump 24, a liquid distribution device 25, and a spinneret 3. One end of the second liquid supply pump 64 is connected to the raw material tank 4, and the other end is connected to the metering pump 24. A filter screen 23 is provided between the raw material tank 4 and the metering pump 24. The metering pump 24 is connected to the liquid distribution device 25. The liquid distribution device 25 is connected to the spinneret 3.

[0069] Solution extrusion device 5 includes a micro-syringe 19 and a spinneret 3. The micro-syringe 19 includes a micro-injection pump, a syringe 20, and an injection tube 21. The micro-injection pump is connected to the syringe 20 to provide pressure, and the injection tube 21 is connected to the spinneret 3. Figure 2 As shown.

[0070] The spinneret 3 is a cylindrical capillary needle spinneret device. The spinneret 3 is connected to the coagulation bath drawing pipe 2, and the axis of the spinneret 3 is aligned with the axis of the coagulation bath drawing pipe 2. Figure 3 As shown, the spinneret 3 includes a liquid inlet 26, a capillary spinneret 28, a fluid chamber 29, and a pipe connector 27. The liquid inlet 26 is connected to the liquid distribution device 25, and the two ends of the pipe connector 27 are connected to the drawing pipe 2. The number of capillary spinnerets 28 is 1 to 10,000.

[0071] The capillary spinneret 28 has an axial angle of 0–180° with the coagulation bath drawing pipe, such as… Figure 4 As shown, there are three main configuration types: downstream type A, vertical type B, and upstream type C.

[0072] The spinneret 3 includes circumferentially arranged annular spinnerets 59, triangular spinnerets 61, square spinnerets 62, and polygonal spinnerets 63; and axially arranged linear spinnerets 60 and corner spinnerets 65, such as... Figure 5 As shown; Figure 6 The images show axial views of various spinnerets, and the configuration of the coagulation bath drawing pipe 2 is adjusted accordingly based on the type of spinneret 3.

[0073] The fiber dynamic collection mechanism includes: a drive and transmission unit, a collection unit 11, and a stabilizing bath 18; the drive and transmission unit includes a drive motor, a transmission chain, transmission gears, a collection screen 9, a drive shaft 33, a first driven shaft 30, a second driven shaft 31, and a third driven shaft 32, wherein the drive motor directly drives the drive shaft 33 and the collection screen 9 to rotate, and the drive shaft 33 drives the stripping shaft 15 to rotate through the transmission chain; the stripping shaft 15 is connected to the fiber guiding shaft 16 through the transmission chain; the fiber guiding shaft 16 is connected to the winding shaft 17 through the transmission chain; the collection screen 9, the drive shaft 33, and the three driven shafts are placed in the coagulation bath 8; the fiber guiding shaft 16 and the winding shaft 17 are placed in the stabilizing bath 8.

[0074] In the fiber dynamic collection mechanism, the drive shaft 33 and the collection screen 9 move synchronously. The prepared hydrogel fibers are sent out through the coagulation and stretching pipe 2 and then supported by the collection screen 9, making the hydrogel fiber transport more stable, preventing the fibers from tangling together, and allowing for further stretching of the nascent fibers. The fibers are then conveyed to the drive shaft 33 via the third driven shaft 32. The peeling shaft 15 peels the fibers from the collection screen 9 and they fall into the stabilizing bath 18. After passing through the support screen 38, the fibers are sequentially conveyed to the guide shaft 16, the first winding shaft 35, the second winding shaft 36, and finally wound and collected by the third winding shaft 17. Figure 1 As shown.

[0075] The control system includes a drafting fluid control module 42, an extrusion mechanism control module 43, a fiber dynamic collection mechanism control module 44, and a main power control module 56. The drafting fluid control module includes a drafting switch 45, a flow rate adjustment knob 46, and a flow rate display 47. The drafting switch 45 controls the working state of the fluid circulation coagulation drafting mechanism. When activated, the first feed pump 22 starts working, drawing the coagulation bath solution from the coagulation bath tank 8 into the drafting pipe 2. The coagulation bath solution flows back to the coagulation bath tank 8 after passing through the drafting pipe 2. The flow rate adjustment knob 46 adjusts the flow rate of the coagulation bath solution in the drafting pipe 2, and the flow rate display 47 shows the flow rate of the coagulation bath solution. The extrusion mechanism control module includes a feed pump switch 48, a flow pump switch 49, a feed speed adjustment knob 50, and a feed flow rate display. The display panel 51 includes a liquid supply pump switch 48 for controlling the start and stop of the second liquid supply pump 64, a flow pump switch 49 for controlling the metering pump 24, a liquid supply speed control knob 50 for controlling the speed of the spinning solution extrusion, and a liquid supply flow display 51 for displaying the flow rate of the spinning solution. The fiber dynamic collection mechanism control module includes a collection switch 52, a speed adjustment knob 53, an emergency stop button 54, and a speed display 55. The collection switch 52 controls the opening and closing of the fiber dynamic collection mechanism, the speed adjustment knob 53 adjusts the speed of the drive shaft 33, the emergency stop button 54 stops the drive shaft 33, and the speed display 55 displays the speed of the drive shaft 33. The main power control module 56 includes a main power switch 57 and a main machine emergency stop button 58. The control system's instrument panel and buttons include... Figure 6 As shown.

[0076] The first liquid supply pump 22 is a water pumping power motor, and its parameter adjustment settings are in the control system.

[0077] The working principle of the spinning device for continuous hydrogel fibers with controllable fineness in this embodiment:

[0078] The prepared spinning solution is injected into the spinneret 3 through the spinning mechanism. The spinning solution is extruded from the capillary spinneret 28 of the spinneret into the coagulation bath drawing pipe 2 and drawn by the high-speed fluid in the coagulation bath drawing pipe 2. It flows out of the fiber outlet at the end of the pipe and falls onto the collecting screen 9, where it is collected and transferred to the peeling roller 15 for winding and collection. Finally, it is further cross-linked in the stabilizing bath to form hydrogel fibers. The prepared hydrogel fibers are then wound and collected by the winding shaft 17.

[0079] Example 2

[0080] This embodiment improves upon Embodiment 1 by modifying the stretching pipe 2 in the fluid circulation solidification stretching mechanism, such as... Figure 7 As shown, the specific implementation method is as follows:

[0081] The drawing pipe 2 includes a tangential bend joint 70. A liquid inlet 73 is provided on the upper section of the arc-shaped fluid cavity 71 of the tangential bend joint 70. The liquid inlet 73 is connected to an extended spinneret 72, which is connected to a liquid distribution device 25. The liquid inlet 73 can be arranged in a straight line 74 or in a ring 75. In this embodiment, the spinning solution enters the drawing pipe 2 through the extended spinneret 72. The direction of the spinning solution injection is parallel to the flow direction of the coagulation bath solution. Based on the elimination of the tangential force of the fluid side on the nascent fiber during the spinning process at the fiber outlet, the fiber entanglement can be reduced to a certain extent. Since the early cross-linking of the nascent fiber is not stable enough, the high-speed tangential fluid will cause fiber breakage. The injection direction parallel to the fluid can reduce the breakage of the nascent fiber.

[0082] Example 3

[0083] This embodiment improves upon Embodiment 1 by modifying the fluid circulation solidification stretching mechanism, such as... Figure 8 As shown, the specific implementation method is as follows:

[0084] Further optimization of the drawing pipe 2, the fluid circulation solidification drawing mechanism also includes a third feed pump 40, a four-way conversion joint 41, a first injection channel 76, a second injection channel 77, a third injection channel 78, and an improved device 79. Figure 9The improved device 79 is a cylindrical tube with three circumferentially distributed inlets. The inlets are at an angle of 90° to 180° to the flow direction of the coagulation bath solution. The two ends of the improved device 79 are pipe joints, with the pipe diameter at the inlet being larger than that at the outlet. The inlet of the third feed pump 40 is connected to the coagulation bath 8, and the outlet is connected to a four-way conversion connector 41. The four-way conversion connector 41 connects to the first injection channel 76, the second injection channel 77, and the third injection channel 78, respectively. The first injection channel 76, the second injection channel 77, and the third injection channel 78 are connected to the circumferentially distributed inlets of the improved device 79. The improved device 79 is axially connected to a drawing tube. Channel 2, the first injection channel 76, the second injection channel 77 and the third injection channel 78 are respectively connected to the three capillary spinnerets 28 of the spinneret 3; the third liquid supply pump 40 injects the coagulation bath solution into the first injection channel 76, the second injection channel 77 and the third injection channel 78, and the spinneret 3 injects the spinning solution evenly into the first injection channel 76, the second injection channel 77 and the third injection channel 78; the spinning solution is drawn in the first injection channel 76, the second injection channel 77 and the third injection channel 78 to form hydrogel fibers, and the coagulation bath solution flowing in the drawing pipe 2 drives the fibers to undergo preliminary twisting to form yarn, which is collected by the collecting screen 9.

[0085] (1) Weigh 0.4g of sodium alginate and sodium carboxymethyl cellulose mixed powder (sodium alginate: carboxymethyl cellulose 6:4) and dissolve it in 20mL of deionized water. Pour it into the raw material tank 4 and stir it thoroughly to obtain a spinning solution. Weigh 30g of calcium chloride granules and dissolve them in 1000g of deionized water to obtain a calcium chloride coagulation bath solution with a mass concentration of 3%. Pour the solution into the coagulation bath tank 8 in the fluid circulation coagulation and stretching mechanism.

[0086] (2) The spinning solution is extruded into the coagulation bath solution at a feed rate of 5 mL / min. The capillary spinneret 28 used for spinning has a specification of 0.5 mm. The flow rate of the coagulation bath solution is adjusted to 0.99 m / s. The multi-channel hydrogel nascent fibers are stretched by the rapidly flowing coagulation bath solution, and the hydrogel fibers are further twisted by the improved device 79. After being collected by the collecting device, the fibers are wound onto a winding shaft and fall into the stabilizing bath, finally obtaining the twisted hydrogel yarn, see [link to documentation]. Figure 10 .

[0087] Example 4

[0088] This implementation improves the fiber dynamic collection mechanism based on Example 1, such as... Figure 11 As shown.

[0089] The fiber dynamic collection mechanism also includes a pressing screen 66 and a supporting screen 67. The pressing screen 66 is located above the collecting screen 9; the supporting screen 67 is located above the collecting unit 11. The solution extrusion device 5 pushes the spinning solution out of the spinneret 3, injects it into the drawing pipe 2, and drops it into the coagulation bath 8. The drive shaft 33 drives the driven shaft to bring the fiber into the collecting screen 9. In order to prevent the high-speed water flow from causing irregular entanglement of the fiber, the pressing screen 66 set above the collecting screen 9 gives the fiber a gentle pressure, forcing the fiber to be transmitted forward in a parallel state. The peeling shaft 15 then peels the fiber from the collecting screen to the supporting screen 38 and drops it into the stabilizing bath 18. The supporting screen 67 is installed above the supporting screen to coordinate the forward transmission of the fiber. The fiber guide shaft 16 passes through the winding shaft 35 and the winding shaft 36 in sequence. The fiber is finally collected by the winding shaft 17. The setting of the pressing screen 66 and the supporting screen 67 makes the transmission of hydrogel fiber more stable during the collection process, which can prevent the hydrogel fiber from breaking and is not easy to entangle together.

[0090] Example 5

[0091] This embodiment provides a spinning method for mass production of hydrogel fibers with controllable fineness, using the apparatus of Embodiment 1. The specific implementation method is as follows:

[0092] (1) Weigh 0.4g of sodium alginate powder and dissolve it in 20mL of deionized water. Add 0.02g of quercetin powder and inject it into the raw material tank 4. Stir it thoroughly and mix it evenly to obtain the spinning solution. Weigh 30g of calcium chloride granules and dissolve them in 1000mL of deionized water to obtain a calcium chloride coagulation bath solution with a concentration of 3%. Inject it into the coagulation bath tank 8 in the fluid circulation coagulation and stretching mechanism.

[0093] (2) The spinning solution from step (1) is extruded into the calcium chloride coagulation bath solution through the spinneret 3 at a feed rate of 3 mL / min. The inner diameter of the capillary spinneret 28 used for spinning is 0.5 mm, and the flow rate of the coagulation bath solution is 0.8 m / s. The hydrogel nascent fibers are stretched by the rapidly flowing coagulation bath solution. After stabilization in the stabilizing bath, the hydrogel fibers pass through the collecting screen 9, the peeling shaft 15, and the fiber guiding shaft 16, and are finally wound onto the winding shaft 17, thus continuously preparing hydrogel fibers of uniform thickness.

[0094] (3) The prepared hydrogel fibers were soaked in a coagulation bath for 12 hours, rinsed three times with deionized water, and then freeze-dried at -40°C for 24 hours to obtain the hydrogel fiber material. See [link to relevant documentation]. Figure 12 .

[0095] Example 6

[0096] This embodiment provides a spinning method for mass production of hydrogel fibers with controllable fineness, using the apparatus of Embodiment 1. The specific implementation method is as follows:

[0097] After degumming, silk is soaked in a swelling solution prepared with water, calcium salt and anhydrous ethanol, and swollen at 45-80℃ for 0.5-8 hours to obtain swollen silk fibers. Then, the swollen silk fibroin fibers are cut, frozen, mechanically peeled and centrifuged to obtain a silk fibroin nanofiber suspension. Finally, the silk fibroin nanofiber suspension is freeze-dried to obtain silk fibroin nanofibers.

[0098] (1) Weigh 1.8g sodium alginate and 0.2g silk fibroin nanofibers and dissolve them in 100mL deionized water. Then add 0.225g polyethylene glycol and stir thoroughly to dissolve and obtain spinning solution. Inject the spinning solution into raw material tank 4. Dissolve 60g anhydrous calcium chloride in 2000mL deionized water to obtain coagulation bath solution and inject it into coagulation bath tank 8 in fluid circulation coagulation and stretching mechanism.

[0099] (2) The spinning solution is extruded into the coagulation bath solution at a feed rate of 3 mL / min. The inner diameter of the capillary spinneret 28 used for spinning is 0.34 mm. The flow rate of the coagulation bath solution is adjusted to 0.99 m / s. The hydrogel nascent fibers are stretched by the rapidly flowing coagulation bath solution. The stretched hydrogel fibers are collected by the collection device 11 and then wound onto the winding shaft 17 to finally obtain continuous and uniform hydrogel fibers. The fibers are then soaked in the coagulation bath solution for 12 h to fully crosslink and prepare the silk fibroin nanofiber reinforced hydrogel fibers.

[0100] (3) The prepared hydrogel fibers were rinsed three times with deionized water, and then freeze-dried at -40℃ for 24 hours to obtain the hydrogel fiber material. See [link to relevant documentation]. Figure 13 .

[0101] The mechanical properties of the hydrogel fibers prepared in Examples 5 and 6 were tested, and the tensile curves obtained are shown below. Figure 14 As shown in the figure, it can be seen that the tensile strength of the hydrogel fiber in Example 6 is much greater than that in Example 5.

[0102] Example 7

[0103] This embodiment provides a spinning method for mass production of hydrogel fibers with controllable fineness, using the apparatus of Embodiment 1. The specific implementation method is as follows:

[0104] (1) Weigh 1g of chitosan and dissolve it in 1% acetic acid solution, then add 5wt% PEGDA and 0.05% (v / v) photoinitiator and stir thoroughly in the dark to obtain spinning solution. Inject the spinning solution into raw material tank 4; dissolve 20g of anhydrous calcium chloride in 1000mL of deionized water to obtain coagulation bath solution, and inject it into coagulation bath tank 8 in fluid circulation coagulation drawing mechanism;

[0105] (2) The spinning solution is extruded into the coagulation bath solution at a feed rate of 5 mL / min. The capillary spinneret 28 used for spinning has a specification of 0.22 mm. The flow rate of the coagulation bath solution is adjusted to 0.99 m / s. The hydrogel nascent fiber is stretched by the rapidly flowing coagulation bath solution. The hydrogel fiber is polymerized by ultraviolet light with a wavelength of 365 nm. The hydrogel fiber is finally wound onto the winding shaft 17 to prepare a continuous and uniform hydrogel fiber. The fiber is then immersed in the coagulation bath solution and irradiated with ultraviolet light for 30 min to fully crosslink it, thus preparing an ultraviolet crosslinked hydrogel fiber.

[0106] (3) The prepared hydrogel fibers were rinsed three times with deionized water, and then freeze-dried at -40℃ for 24 hours to obtain the hydrogel fiber material. See [link to relevant documentation]. Figure 15 .

[0107] Example 8

[0108] This embodiment provides a spinning method for mass production of hydrogel fibers with controllable fineness, using the apparatus of Embodiment 1. The specific implementation method is as follows:

[0109] (1) Weigh 2g of sodium alginate and 0.25mg / mL of dopamine nanoparticles and mix them in 100mL of deionized water to obtain spinning solution. Inject the spinning solution into raw material tank 4. Dissolve 60g of anhydrous calcium chloride in 2000mL of deionized water to obtain coagulation bath solution and inject it into coagulation bath tank 8 in fluid circulation coagulation stretching mechanism.

[0110] (2) The spinning solution is extruded into the coagulation bath solution at a feed rate of 1 mL / min. The capillary spinneret 28 used for spinning has a specification of 0.18 mm. The flow rate of the coagulation bath solution is adjusted to 1.03 m / s. The hydrogel nascent fibers are stretched by the rapidly flowing coagulation bath solution. The hydrogel fibers fall into the coagulation bath tank 8 through the collecting screen 9 for collection. They are then cut into short fibers with scissors, broken into a uniform suspension by a homogenizer, and poured into a sieve for uniform settling. Afterward, they are freeze-dried at -40℃ for 24 h to obtain hydrogel fiber nonwoven material, such as... Figure 16 .

[0111] Example 9

[0112] In Example 5, the propulsion speed was adjusted to 1 mL / min, 2 mL / min, 3 mL / min, 4 mL / min, and 5 mL / min, while other parameters remained unchanged, resulting in hydrogel fibers of different diameters. The morphologies of the hydrogel fibers prepared at different propulsion speeds are shown below. Figure 17 As shown, the mechanical properties are as follows Figure 18 As shown, when the propulsion speed is adjusted to 1 mL / min, the strength of the prepared hydrogel fiber can reach 50 MPa. As the propulsion speed increases, the fiber diameter becomes thicker.

[0113] Propulsion rate (mL / min) 1 2 3 4 5 Hydrogel fiber diameter (μm) 58.6±5.8 67.1±4.4 72.2±8.7 79.3±9.8 92.7±9.6

[0114] Example 10

[0115] The flow rate of the coagulation bath solution in Example 6 was adjusted to 0 m / s, 0.99 m / s, 1.17 m / s, 1.32 m / s, and 1.42 m / s, while keeping other parameters constant, to obtain hydrogel fibers of different diameters. The morphologies of the hydrogel fibers prepared at different water flow rates are shown below. Figure 19 As shown, the mechanical properties are as follows Figure 20 As shown, when the flow rate of the coagulation bath solution is 0 m / s, the elongation of the prepared hydrogel fibers can reach a maximum of 400. Meanwhile, the fiber diameter decreases with increasing water flow velocity.

[0116] Water flow velocity (m / s) 0 0.99 1.17 1.32 1.42 Hydrogel fiber diameter (μm) 500.6±15.2 84.8±6.1 62.1±4.1 45.2±8.7 36.3±6.5

[0117] Example 11

[0118] In Example 7, the propulsion speed was adjusted to 1 mL / min, 2 mL / min, 3 mL / min, 4 mL / min, and 5 mL / min, while other parameters remained constant, resulting in hydrogel fibers of different diameters. The morphologies of the hydrogel fibers prepared at different propulsion speeds are shown below. Figure 21 As shown, the fiber diameter increases with increasing propulsion speed.

[0119] Propulsion rate (mL / min) 1 2 3 4 5 Hydrogel fiber diameter (μm) 52.2±7.1 75.9±6.7 83.0±7.8 89.4±9.1 77.1±10.6

[0120] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Anyone skilled in the art can make various modifications and alterations without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be determined by the claims.

Claims

1. A spinning device for continuous hydrogel fibers with controllable fineness, characterized in that, The system includes a spinning mechanism, a fluid circulation coagulation and drawing mechanism, a fiber dynamic collection mechanism, and a control system. The spinning mechanism mixes and stores the spinning solution and extrudes it into the fluid circulation coagulation and drawing mechanism to form hydrogel fibers in a coagulation bath solution. The spinning mechanism includes a spinneret with N capillary spinnerets, where N ≥ 1. The fluid circulation coagulation and drawing mechanism flexibly draws the formed hydrogel fibers and causes them to solidify. The fiber dynamic collection mechanism rapidly collects the solidified continuous hydrogel fibers and winds them into a shaft. The control system controls the extrusion speed of the spinning solution, the flow rate of the coagulation bath solution, and the winding speed of the hydrogel fibers in each component of the fiber dynamic collection mechanism. The fluid circulation coagulation and drawing device includes a fluid drive assembly and a coagulation bath. The fluid drive assembly includes a coagulation bath drawing pipe, a flow meter, a pressure gauge, a first feed pump, and a filter screen. The inlet of the first feed pump is connected to the coagulation bath and is equipped with a filter screen. The first feed pump is connected to the drawing pipe. The drawing pipe is an L-shaped pipe, with the lower end of its vertical section connected to the upper outlet of the feed pump. The horizontal section of the drawing pipe is located above the coagulation bath and is connected to the spinneret. A flow meter and a pressure gauge are sequentially installed on the drawing pipe, and a fiber outlet is provided at the end of the coagulation bath drawing pipe. The fluid circulation coagulation and drawing device also includes an improved device, which is axially connected to the drawing pipe. The improved device is a circular tube with three inlets evenly distributed around its circumference. The inlets are at an angle of 90° to 180° to the flow direction of the coagulation bath solution. The fiber dynamic collection mechanism includes a drive and transmission unit, a collection unit, and a stabilizing bath. The drive and transmission unit includes a drive motor, a transmission chain, transmission gears, a collection screen, a drive shaft, and three driven shafts. The drive motor directly drives the drive shaft and the collection screen to rotate. The drive shaft drives the stripping shaft to rotate via the transmission chain. The stripping shaft is connected to the fiber guiding shaft via the transmission chain. The fiber guiding shaft is connected to the winding shaft via the transmission chain. The collection screen, the drive shaft, and the three driven shafts are placed in the coagulation bath. The fiber guiding shaft and the winding shaft are placed in the stabilizing bath.

2. The spinning apparatus according to claim 1, characterized in that, The spinning mechanism includes a raw material tank and a solution extrusion device connected thereto. The solution extrusion device includes a second liquid supply pump, a filter screen, a metering pump, a liquid distribution device, and a spinneret. One end of the second liquid supply pump is connected to the raw material tank, and the other end is connected to the metering pump. A filter screen is provided between the raw material tank and the metering pump. The metering pump is connected to the liquid distribution device, and the liquid distribution device is connected to the spinneret.

3. The spinning apparatus according to claim 2, characterized in that, The spinneret is a cylindrical capillary spinneret spinneret device, including a liquid inlet, a capillary spinneret, a fluid chamber, and a pipe connector; the liquid inlet is connected to a liquid distribution device; the capillary spinneret is connected to the liquid inlet; the number N of the capillary spinnerets is 1 to 10,000.

4. The spinning apparatus according to claim 1, characterized in that, The fiber dynamic collection mechanism further includes a net pressing curtain and a net supporting curtain, with the net pressing curtain located above the collection curtain and the net supporting curtain located above the collection unit.

5. The spinning apparatus according to claim 1, characterized in that, The control system includes a drafting fluid control module, an extrusion mechanism control module, a fiber dynamic collection mechanism control module, and a total power control module. The drafting fluid control module includes a drafting switch, a flow rate adjustment knob, and a flow rate display. The drafting switch is used to control the working state of the fluid circulation coagulation drafting mechanism, the flow rate adjustment knob is used to adjust the flow rate of the coagulation bath solution in the fluid circulation coagulation drafting mechanism, and the flow rate display shows the flow rate of the coagulation bath solution. The extrusion mechanism control module includes a liquid feed pump switch, a flow pump switch, a liquid feed speed control knob, and a liquid feed flow display. The liquid feed pump switch is used to control the start and stop of the liquid feed pump, the flow pump switch is used to control the metering pump, the liquid feed speed control knob is used to control the speed of the spinning solution extrusion, and the liquid feed flow display is used to display the flow rate of the spinning solution. The fiber dynamic collection mechanism control module includes a collection switch, a speed adjustment knob, an emergency stop button, and a speed display. The collection switch is used to control the opening and closing of the fiber dynamic collection mechanism, the speed adjustment knob is used to adjust the speed of the drive shaft, the emergency stop button is used to stop the drive shaft in an emergency, and the speed display is used to display the speed of the drive shaft. The main power control module includes a main power switch and a main machine emergency stop button.

6. The spinning apparatus according to claim 1, characterized in that, The fluid circulation coagulation and drawing mechanism also includes a third liquid supply pump, a four-way conversion joint, a first injection channel, a second injection channel, a third injection channel, and an improvement device. The inlet of the third liquid supply pump is connected to the coagulation bath, and the outlet is connected to the four-way conversion joint. The four-way conversion joint is connected to the first injection channel, the second injection channel, and the third injection channel respectively. The first injection channel, the second injection channel, and the third injection channel are connected to the circumferentially evenly distributed liquid inlets of the improvement device. The first injection channel, the second injection channel, and the third injection channel are respectively connected to the three capillary spinnerets of the spinneret. The third liquid supply pump injects the coagulation bath solution into the first injection channel, the second injection channel, and the third injection channel. The spinneret injects the spinning solution evenly into the first injection channel, the second injection channel, and the third injection channel. The spinning solution is drawn in the first injection channel, the second injection channel, and the third injection channel to form hydrogel fibers. The coagulation bath solution flowing in the drawing pipe of the fluid circulation coagulation and drawing mechanism drives the fibers to undergo preliminary twisting to form yarn.

7. A spinning method for mass production of hydrogel fibers with controllable fineness, characterized in that, The spinning apparatus according to any one of claims 1 to 6 comprises the following steps: (1) Dissolve natural polysaccharides, polymers or monomers in water to obtain spinning solution and inject it into the spinning mechanism; dissolve inorganic salts in water to obtain coagulation bath solution and inject it into the fluid circulation coagulation drawing mechanism; (2) The spinning mechanism mixes the spinning solution evenly and injects it into the fluid circulation coagulation and drawing mechanism. The spinning solution is rapidly cross-linked and solidified in the coagulation bath solution in the fluid circulation coagulation and drawing mechanism to form hydrogel fibers. (3) The hydrogel fibers are collected and wound by a fiber dynamic collection mechanism; The natural polysaccharides include one or more of sodium alginate, hyaluronic acid, and chitosan derivatives; the high molecular weight polymers include one or more of carboxymethyl cellulose, carboxymethyl chitosan, carboxymethyl starch, gelatin, silk fibroin, polyvinyl alcohol, and polyethylene glycol; and the inorganic salts include one of calcium chloride, ferric chloride, and zinc chloride.

8. A hydrogel fiber, characterized in that, It is prepared using the apparatus according to any one of claims 1 to 6 or the method according to claim 7.

Images