A dry-wet spinning coagulating device

Abstract

The application discloses a dry-wet spinning coagulation device and belongs to the technical field of chemical fiber spinning. The device comprises a coagulation disc assembly and a coagulation tank. The coagulation disc assembly is arranged above the coagulation tank. The coagulation disc assembly comprises a water inlet pipe, a coagulation disc shell, a coagulation bath buffer bin, a funnel and a spinning pipe. The coagulation disc shell, the coagulation bath buffer bin, the funnel and the spinning pipe are concentrically arranged. The bottom of the coagulation disc shell is connected with the bottom of the coagulation bath buffer bin. The water inlet pipe is in communication with the coagulation disc shell. The upper end of the coagulation disc shell and the upper end of the coagulation bath buffer bin are both provided with an opening. The upper edge of the coagulation disc shell is higher than the upper edge of the coagulation bath buffer bin. The coagulation bath buffer bin is provided with a containing cavity for placing the funnel. The containing cavity is in communication with the coagulation bath buffer bin through a water inlet. The lower end of the funnel is connected with the upper end of the spinning pipe. The spinning pipe penetrates through the bottom of the coagulation disc shell. The lower end of the spinning pipe is immersed in the coagulation tank. The application can effectively improve the performance of fibers and the stability of production.

Description

Technical Field

[0001] This invention belongs to the field of chemical fiber spinning technology, specifically relating to a dry-wet spinning coagulation device. Background Technology

[0002] Dry-wet spinning is a commonly used spinning method where the spinning solution extruded from the spinneret passes through an air layer before entering the coagulation bath. Compared to wet spinning, dry-wet spinning offers advantages such as the ability to use high-concentration spinning solutions and improved spinning speed and fiber strength. High-performance organic fibers such as para-aramid (aramid II), poly(p-phenylenebenzodioxazole) (PBO), poly[2,5-dihydroxy-1,4-phenylenepyridinium diimidazolium] (PIPD), and poly(p-phenylenebenzodithiazole) (PBT) are all prepared using dry-wet spinning technology. Many other fibers, including meta-aramid, heterocyclic aramid, aramid sulfone, polyacrylonitrile fiber (polyacrylonitrile fiber), polyvinyl alcohol fiber, ultra-high molecular weight polyethylene fiber, and lyocell fiber, have also been developed using dry-wet spinning technology in addition to conventional wet spinning.

[0003] The coagulation assembly is a core component of the dry-wet spinning process, significantly influencing spinning speed and fiber properties. (See attached image) Figure 1 This is a schematic diagram of the structure of the coagulation device commonly used for several fibers such as aramid II, PBO, PIPD and PBT reported in patents such as US5853640, US4702876 and CN200720082833. The coagulation bath enters the coagulation plate (3) and comes into contact with the spinning solution to coagulate. Then, the coagulation bath is accelerated by its own weight and pressure and flows out of the spinning tube (4) at high speed together with the nascent fiber. The structure of this coagulation component is well-suited to the spinning characteristics of this type of fiber. Because the spinning solution for fibers such as aramid II, PBO, PIPD, and PBT is in a liquid crystal state, the nascent fibers after coagulation already possess high strength. Furthermore, these fibers use inorganic acids such as concentrated sulfuric acid or polyphosphoric acid as solvents, resulting in rapid diffusion in the coagulation bath. Sufficient coagulation can be achieved in a short time, allowing spinning speeds to reach over 300 m / min, or even 800 m / min. The high-speed flowing coagulation bath in the coagulation tube (4) has low frictional resistance against the high-speed moving nascent fibers, which helps stabilize spinning and improve the mechanical properties of the fibers. However, this type of coagulation component structure is not suitable for a series of fibers spun in a non-liquid crystal state, such as meta-aramid, heterocyclic aramid, ether-containing copolymerized aramid, sulfolane aramid, and polyacrylonitrile fibers, which use organic solvents as spinning solvents. This is because organic solvents diffuse slowly in the coagulation bath, and the nascent fibers have low strength and slower spinning speeds compared to fibers such as aramid II and PBO. They require a longer residence time in the coagulation bath. Figure 1In structural coagulation components, excessively high flow rates in the coagulation bath can easily lead to breakage of nascent fibers, and short coagulation bath durations make it difficult to achieve complete coagulation. Therefore, the literature "High-Performance and Specialty Fibers" (Society of FS Technology, Japan(ed). DOI:10.1007 / 978-4-431-55203-1_9) suggests that ether-containing copolymerized aramid fibers, where organic solvents are used as spinning solvents, are suitable for use as described in the attached document. Figure 2 The coagulation assembly with the structure shown allows the spinning solution to be extruded and fall into a nearly static coagulation bath after passing through an air layer. After being redirected, the fiber is drawn out. This type of coagulation assembly has a long bath length, which helps to increase the residence time of the fiber in the coagulation bath and achieve thorough coagulation. Currently, many patents, such as CN1146218A, JP2017160564A, CN106283254A, KR1020180089933A, and CN206799803U, report the use of this structure or its improved structures to prepare cellulose fibers, polyacrylonitrile fibers, meta-aramid fibers, and other fibers. However, this type of coagulation component has two drawbacks. First, the coagulation bath has no flow velocity along the fiber direction (vertical direction), resulting in significant frictional resistance with the spinning solution and nascent fibers, which is not conducive to improving fiber performance. Second, during coagulation bath circulation, the coagulation bath liquid surface will have a slow flow in the horizontal direction. At this time, the fine stream of spinning solution has just come into contact with the coagulation bath and does not yet have mechanical strength. The horizontal disturbance of the coagulation bath not only leads to unstable spinning phenomena such as fiber breakage, but also is not conducive to improving fiber spinning performance and performance uniformity. Summary of the Invention

[0004] The purpose of this invention is to develop a novel coagulation device for high-speed dry-jet wet spinning, particularly suitable for spinning processes of heterocyclic aramid fibers, ether-containing copolymerized aramid fibers, meta-aramid fibers, aramid sulfone fibers, polyacrylonitrile fibers, and other non-liquid crystal spun fibers using organic solvents as spinning solvents. The novel coagulation device designed in this invention can not only effectively improve fiber performance but also enhance production stability.

[0005] The objective of this invention is achieved through the following technical solution: A dry-wet spinning coagulation apparatus includes a coagulation disc assembly and a coagulation tank. The coagulation disc assembly is disposed above the coagulation tank. The coagulation disc assembly includes a water inlet pipe, a coagulation disc shell, a coagulation bath buffer chamber, a funnel, and a spinning tube. The coagulation disc shell, coagulation bath buffer chamber, funnel, and spinning tube are concentrically arranged. The bottom of the coagulation disc shell is connected to the bottom of the coagulation bath buffer chamber. The water inlet pipe is connected to the coagulation disc shell. The upper ends of the coagulation disc shell and the coagulation bath buffer chamber are both open. The upper edge of the coagulation disc shell is higher than the upper edge of the coagulation bath buffer chamber. The coagulation bath buffer chamber has a receiving cavity in the middle for placing the funnel. The receiving cavity is connected to the coagulation bath buffer chamber through a water inlet. The lower end of the funnel is connected to the upper end of the spinning tube. The spinning tube passes through the bottom of the coagulation disc shell, and the lower end of the spinning tube is immersed in the coagulation tank.

[0006] Preferably, a buffer tank is provided between the coagulation bath buffer chamber and the outer shell of the coagulation pan. The water inlet pipe is connected to the buffer tank.

[0007] Preferably, the coagulation bath buffer chamber includes an outer wall and an inner wall.

[0008] Preferably, the inner wall of the buffer chamber is provided with multiple rows of water inlets in the circumferential direction.

[0009] Preferably, the upper edge of the funnel is not higher than the upper edge of the inner wall of the buffer chamber.

[0010] Preferably, the solidification tray assembly is connected to a lifting mechanism, and the lifting mechanism controls the solidification tray assembly to be immersed in the solidification tank. The lifting mechanism is a robotic arm.

[0011] Preferably, the height difference H between the upper end face of the funnel and the upper liquid surface of the solidification tank is 10mm-100mm.

[0012] Preferably, a coagulation bath inlet is provided below the coagulation tank, and a coagulation bath outlet is provided above the coagulation tank.

[0013] Preferably, a guide wheel is provided at the lower end of the center line of the spinning tube.

[0014] Preferably, the upper end of the funnel is provided with a creeping section.

[0015] The beneficial effects of this technical solution are as follows: I. The present invention provides a dry and wet spinning coagulation device. The device is equipped with a coagulation plate and a buffer chamber in the coagulation plate. After passing through the buffer chamber, the coagulation bath flows steadily and slowly into the funnel. The stable flow of the coagulation bath makes the fine stream of spinning solution less disturbed when it comes into contact with the surface of the coagulation bath, which is beneficial to improving the spinning stability. II. The present invention provides a dry-wet spinning coagulation device that enables the coagulation bath in the spinning tube to maintain a certain flow velocity in the vertical direction of the nascent fiber movement. The height difference between the liquid surface of the coagulation pan and the liquid surface of the coagulation tank can be adjusted by regulating the raising and lowering of the coagulation pan, thereby controlling the speed of the coagulation bath in the spinning tube to match the spinning speed. On the one hand, this overcomes the problem of no vertical flow in the coagulation bath in existing technologies, reducing frictional resistance with the fiber and thus helping to improve the mechanical properties of the fiber; on the other hand, it achieves the matching of the coagulation bath flow velocity with the spinning speed. It is particularly suitable for the spinning process of heterocyclic aramid fibers, ether-containing copolymerized aramid fibers, meta-aramid fibers, aramid sulfone fibers, polyacrylonitrile fibers, and other non-liquid crystal state spun fibers using organic solvents as spinning solvents. Attached Figure Description

[0016] The foregoing and hereinafter detailed description of the invention becomes clearer when read in conjunction with the following drawings, in which: Figure 1 This is a schematic diagram of the solidification assembly structure commonly used in the spinning of liquid crystal fibers such as aramid II and PBO. Figure 2 This is a schematic diagram of the solidification component structure commonly used for non-liquid crystal spinning fibers such as meta-aramid, ether-containing copolymer modified aramid, and polyacrylonitrile fiber, which use organic solvents as spinning solvents. Figure 3 This is a schematic diagram (front view) of the dry and wet coagulation component structure of the present invention. Figure 4 This is a schematic diagram (45° top view) of the dry and wet solidification assembly of the present invention. Figure 5 This is a schematic diagram (top view) of the dry and wet solidification component structure of the present invention. Figure 6 This is a schematic diagram of the solidification disc assembly in this invention; In the diagram: 1. Coagulation tank; 2. Inlet pipe; 3. Coagulation pan shell; 4. Funnel; 4.1. Creep section; 5. Inlet; 6. Buffer chamber outer wall; 7. Buffer chamber inner wall; 8. Spinning tube; 9. Guide wheel; 10. Coagulation bath inlet; 11. Coagulation bath outlet. Detailed Implementation

[0017] The present invention will be specifically described below through embodiments. It should be noted that the following embodiments are only used to further illustrate the present invention and should not be construed as limiting the scope of protection of the present invention. Those skilled in the art can make some non-essential improvements and adjustments to the present invention based on the above content, which still fall within the scope of protection of the present invention.

[0018] like Figures 3-6As shown, a dry-wet spinning coagulation device includes a coagulation disc assembly and a coagulation tank 1. The coagulation disc assembly is disposed above the coagulation tank 1. The coagulation disc assembly includes a water inlet pipe 2, a coagulation disc shell 3, a coagulation bath buffer chamber, a funnel 4, and a spinning tube 8. The coagulation disc shell 3, the coagulation bath buffer chamber, the funnel 4, and the spinning tube 8 are concentrically arranged. The bottom of the coagulation disc shell 3 is connected to the bottom of the coagulation bath buffer chamber. The water inlet pipe 2 is connected to the coagulation disc shell 3 and is located near the outside of the coagulation disc. Multiple through holes are provided on the side of the shell 3. The upper end of the coagulation disc shell 3 and the upper end of the coagulation bath buffer chamber are both open. The upper edge of the coagulation disc shell 3 is higher than the upper edge of the coagulation bath buffer chamber. The middle part of the coagulation bath buffer chamber is provided with a receiving cavity for placing the funnel 4. The receiving cavity is connected to the coagulation bath buffer chamber through the water inlet 5. The lower end of the funnel 4 is connected to the upper end of the spinning tube 8. The spinning tube 8 passes through the bottom of the coagulation disc shell 3, and the lower end of the spinning tube 8 is immersed in the coagulation tank 1.

[0019] A buffer trough is provided between the coagulation bath buffer chamber and the outer shell 3 of the coagulation pan. The water inlet pipe 2 is connected to the buffer trough.

[0020] The coagulation bath buffer chamber includes an outer wall 6 and an inner wall 7. The upper edge of the outer wall 6 is not lower than the upper edge of the inner wall 7.

[0021] The inner wall of the buffer chamber has multiple rows of water inlets 5 arranged upwards around its circumference.

[0022] The upper edge of the funnel 4 is not higher than the upper edge of the inner wall 7 of the buffer chamber.

[0023] The solidification tray assembly is connected to a lifting mechanism, which controls the solidification tray assembly to be immersed in the solidification tank 1. The lifting mechanism is a robotic arm.

[0024] The height difference H between the upper end face of the funnel 4 and the upper liquid surface of the solidification tank 1 is 10mm-100mm.

[0025] The coagulation tank 1 is provided with a coagulation bath inlet 10 below it and a coagulation bath outlet 11 above it.

[0026] The spinning tube 8 has a guide wheel 9 at its lower center line. The coagulation tank 1 also has multiple guide wheels 9 at its upper end.

[0027] The funnel 4 has a creeping section 4.1 at its upper end. The creeping section 4.1 is shaped like an inverted bowl.

[0028] The working process of this invention is as follows: First, the coagulation bath is transported through the water inlet pipe 2 to the buffer tank between the coagulation bath buffer tank and the outer shell 3 of the coagulation plate. After the coagulation bath fills the buffer tank, it overflows from the top of the buffer tank into the coagulation bath buffer tank. The coagulation bath in the coagulation bath buffer tank enters the receiving cavity through the water inlet hole provided in the inner wall 7 of the buffer tank. The coagulation bath rises along the creep section at the top of the funnel 4. When the liquid level of the coagulation bath reaches the upper edge of the funnel 4, it flows into the funnel 4 and then into the coagulation tank 1 through the spinning tube 8. Meanwhile, the coagulation bath is transported to the coagulation tank 1 through the coagulation bath inlet 10 located at the lower part of the coagulation tank 1. When the coagulation bath liquid level reaches the position of the coagulation bath outlet 11 located at the upper part of the coagulation tank 1, it flows out from the coagulation bath outlet 11. Then, the depth of the coagulation plate assembly immersed in the coagulation tank 1 is adjusted by the lifting mechanism connected to the coagulation plate shell 3, the height difference H between the coagulation bath liquid surface in the coagulation plate assembly and the coagulation bath liquid surface in the coagulation tank 1 is controlled, and the flow rate of the coagulation bath in the spinning tube 8 is controlled. Finally, the fine stream of spinning solution squeezed out from the spinneret falls into the coagulation pan assembly and comes into contact with the coagulation bath. Mass and heat transfer occur, and the fibers solidify into nascent fibers. The nascent fibers and the coagulation bath flow together through the funnel 4 and the spinning tube 8 into the coagulation tank 1. The nascent fibers are then drawn out of the coagulation tank 1 by the guide wheel 9 located directly below the spinning tube 8. During the drawing process, the fibers continue to solidify fully in the coagulation tank 1.

[0029] In addition, it is worth noting that: 1) Under the same conditions, fiber mechanical properties and spinning stability are used as evaluation criteria; 2) Heterocyclic aramid and ether-containing copolymer modified aramid are high-strength fibers, and the mechanical properties of these fibers are tested using bundled filaments in this invention, with the testing standard being the national standard GB / T 19975-2005; meta-aramid and sulfolane are conventional high-temperature resistant fibers, and the mechanical properties of these fibers are tested using monofilaments in this invention, with the testing standard being GB / T 14337-2008. 3) The influence of the coagulation component form on the performance of the same type of fiber is compared, but there is no comparative significance between different fibers.

[0030] Examples 1, 2, 3, and 4 employ the dry-wet spinning coagulation apparatus of the present invention; Comparative Examples 1, 2, 3, and 4 employ the apparatus described in the background art. Figure 2 The solidification component of the prior art structure shown.

[0031] Example 1 A heterocyclic aramid / N,N-dimethylacetamide (DMAc) solution with a polymer content of 6% and a dynamic viscosity of 524,000 cP was used as the spinning dosing. After degassing, filtration, and metering, the solution was extruded from a spinneret with 500 holes and a diameter of 0.10 mm, and then passed through a 10 mm air layer before entering the coagulation pan. The coagulation bath was a 50% DMAc aqueous solution at a temperature of 10℃. The extrusion velocity of the spinning dosing from the spinneret was 23.6 m / min, and the height difference between the liquid surface in funnel 4 and the liquid surface in coagulation tank 1 was controlled at 30 mm. The finished fiber was then obtained after subsequent pre-stretching bath, three-stage washing, drying, heat treatment, oiling, and winding. The spinning process and fiber mechanical properties are shown in Table 1.

[0032] Example 2 A copolymerized aramid / N-methylpyrrolidone (NMP) solution containing ether, with a polymer content of 8% of the solution mass and a dynamic viscosity of 658,000 cP, was used as the spinning dosing. After degassing, filtration, and metering, the solution was extruded from a spinneret with 500 holes and a diameter of 0.20 mm, and then passed through a 10 mm high air layer before entering the coagulation pan. The coagulation bath was a 50% NMP aqueous solution at a temperature of 8°C. The extrusion speed of the spinning dosing from the spinneret was 8.8 m / min, and the height difference between the liquid surface in funnel 4 and the liquid surface in coagulation tank 1 was controlled at 10 mm. After subsequent pre-stretching bath, three-stage washing, drying, heat treatment, oiling, and winding, the finished fiber was obtained. The spinning process and fiber mechanical properties are shown in Table 1.

[0033] Example 3 A 18% polymer solution (by mass) and a dynamic viscosity of 670,000 cP in aramid / N,N-dimethylacetamide (DMAc) solution was used as the spinning dosing. After degassing, filtration, and metering, the solution was extruded from a spinneret with 500 holes and a diameter of 0.08 mm, and then passed through an air layer of 14 mm before entering the coagulation pan. The coagulation bath was a 50% DMAc aqueous solution at 5°C. The extrusion velocity of the spinning dosing from the spinneret was 14.7 m / min, and the height difference between the liquid surface in funnel 4 and the liquid surface in coagulation tank 1 was controlled at 18 mm. The finished fiber was then obtained after subsequent pre-stretching bath, three-stage washing, drying, heat treatment, oiling, and winding. The spinning process and fiber mechanical properties are shown in Table 1.

[0034] Example 4 A meta-aramid / N,N-dimethylacetamide (DMAc) solution with a polymer content of 13% and a dynamic viscosity of 287,000 cP was used as the spinning dosing. After degassing, filtration, and metering, the solution was extruded from a spinneret with 500 holes and a diameter of 0.09 mm, and then passed through an air layer of 15 mm before entering the coagulation pan. The coagulation bath was a 50% DMAc aqueous solution at a temperature of 10°C. The extrusion speed of the spinning dosing from the spinneret was 18.8 m / min, and the height difference between the liquid surface in funnel 4 and the liquid surface in coagulation tank 1 was controlled at 25 mm. The finished fiber was then obtained after subsequent pre-stretching bath, three-stage washing, drying, heat treatment, oiling, and winding. The spinning process and fiber mechanical properties are shown in Table 1.

[0035] Comparative Example 1 This comparative example is a comparison with Example 1, using a two-station dry-wet spinning process for a spinning comparison experiment. This comparative example was conducted concurrently with Example 1. The solidification assembly used in this comparative example is as shown in the attached figure. Figure 2 The coagulation assembly shown in the prior art is achieved by removing the coagulation disc structure from the coagulation assembly of the present invention and retaining the coagulation tank 1. This comparative example is a parallel experiment of Example 1. Except for the coagulation assembly structure, the other process conditions are completely consistent with Example 1. The spinning solution, coagulation bath, pre-stretching, washing water, etc. used are from the same system as in Example 1.

[0036] A heterocyclic aramid / N,N-dimethylacetamide (DMAc) solution with a polymer content of 6% and a dynamic viscosity of 524,000 cP was used as the spinning solution. After degassing, filtration, and metering, the solution was extruded from a spinneret with 500 holes and a diameter of 0.10 mm, and then passed through a 10 mm high air layer before entering coagulation bath 1. The coagulation bath was a 50% DMAc aqueous solution at a temperature of 10℃, and the extrusion velocity of the spinning solution from the spinneret was 23.6 m / min. The finished fiber was then obtained after subsequent pre-stretching bath, three-stage washing, drying, heat treatment, oiling, and winding. The spinning process and fiber mechanical properties are shown in Table 1.

[0037] Comparative Example 2 This comparative example is a comparison with Example 2, using a two-station dry and wet spinning process for a spinning comparison experiment. This comparative example was conducted concurrently with Example 2. The solidification assembly used in this comparative example is as shown in the attached figure. Figure 2 The coagulation assembly shown in the prior art is achieved by removing the coagulation disc structure from the coagulation assembly of the present invention and retaining the coagulation tank 1. This comparative example is a parallel experiment of Example 2. Except for the coagulation assembly structure, the other process conditions are completely consistent with Example 2. The spinning solution, coagulation bath, pre-stretching, washing water, etc. used are from the same system as in Example 2.

[0038] A copolymerized aramid / N-methylpyrrolidone (NMP) solution containing ether, with a polymer content of 8% of the solution mass and a dynamic viscosity of 658,000 cP, was used as the spinning solution. After degassing, filtration, and metering, the solution was extruded from a spinneret with 500 holes and a diameter of 0.20 mm, and then passed through a 10 mm high air layer before entering coagulation bath 1. The coagulation bath was a 50% NMP aqueous solution at a temperature of 8°C, and the extrusion velocity of the spinning solution from the spinneret was 8.8 m / min. The finished fiber was then obtained after subsequent pre-stretching bath, three-stage washing, drying, heat treatment, oiling, and winding. The spinning process and fiber mechanical properties are shown in Table 1.

[0039] Comparative Example 3 This comparative example is a comparison with Example 3, using a two-station dry and wet spinning process for a spinning comparison experiment. This comparative example was conducted concurrently with Example 3. The solidification assembly used in this comparative example is as shown in the attached figure. Figure 2 The coagulation assembly shown in the prior art is achieved by removing the coagulation disc structure from the coagulation assembly of the present invention and retaining the coagulation tank 1. This comparative example is a parallel experiment of Example 3. Except for the coagulation assembly structure, the other process conditions are completely consistent with Example 3. The spinning solution, coagulation bath, pre-stretching, washing water, etc. used are from the same system as in Example 3.

[0040] A aramid / N,N-dimethylacetamide (DMAc) solution with a polymer content of 18% and a dynamic viscosity of 670,000 cP was used as the spinning solution. After degassing, filtration, and metering, the solution was extruded from a spinneret with 500 holes and a diameter of 0.08 mm, and then passed through an air layer of 14 mm height before entering coagulation bath 1. The coagulation bath was a 50% DMAc aqueous solution at a temperature of 5℃, and the extrusion velocity of the spinning solution from the spinneret was 14.7 m / min. The finished fiber was then obtained after subsequent pre-stretching bath, three-stage washing, drying, heat treatment, oiling, and winding. The spinning characteristics and mechanical properties of the fiber are shown in Table 1.

[0041] Comparative Example 4 This comparative example is a comparison with Example 4, using a two-station dry-wet spinning process for a spinning comparison experiment. This comparative example was conducted concurrently with Example 4. The solidification assembly used in this comparative example is as shown in the attached figure. Figure 2 The coagulation assembly shown in the prior art is achieved by removing the coagulation disc structure from the coagulation assembly of the present invention and retaining the coagulation tank 1. This comparative example is a parallel experiment of Example 4. Except for the coagulation assembly structure, the other process conditions are completely consistent with Example 4. The spinning solution, coagulation bath, pre-stretching, washing water, etc. used are from the same system as in Example 4.

[0042] A meta-aramid / N,N-dimethylacetamide (DMAc) solution with a polymer content of 13% and a dynamic viscosity of 287,000 cP was used as the spinning solution. After degassing, filtration, and metering, the solution was extruded from a spinneret with 500 holes and a diameter of 0.09 mm, and then passed through an air layer of 15 mm height before entering coagulation bath 1. The coagulation bath was a 50% DMAc aqueous solution at a temperature of 10℃, and the extrusion velocity of the spinning solution from the spinneret was 18.8 m / min. The finished fiber was then obtained after subsequent pre-stretching bath, three-stage washing, drying, heat treatment, oiling, and winding. The spinning process and fiber mechanical properties are shown in Table 1.

[0043] Note: Spinning stability is defined as the number of times filament breaks occur during 72 hours of continuous spinning.

[0044] As can be seen from the table, the performance of the samples prepared using the coagulation component of this invention is better than that of the samples prepared using the coagulation component with the existing technology structure. Moreover, the spinning stability is good. During the continuous spinning process of 72 hours, no fiber breakage occurred in the examples, which significantly improved the spinning stability and fiber performance.

[0045] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A dry-wet spinning coagulation apparatus, characterized in that: The system includes a coagulation pan assembly and a coagulation tank (1). The coagulation pan assembly is positioned above the coagulation tank (1). The coagulation pan assembly includes a water inlet pipe (2), a coagulation pan shell (3), a coagulation bath buffer chamber, a funnel (4), and a spinning tube (8). The coagulation pan shell (3), the coagulation bath buffer chamber, the funnel (4), and the spinning tube (8) are arranged concentrically. The bottom of the coagulation pan shell (3) is connected to the bottom of the coagulation bath buffer chamber. The water inlet pipe (2) is connected to the coagulation pan shell (3). The upper ends of the coagulation pan shell (3) and the upper ends of the coagulation bath buffer chamber are both open. The upper edge of the coagulation pan shell (3) is higher than the upper edge of the coagulation bath buffer chamber. The coagulation bath buffer chamber has a receiving cavity in the middle for placing the funnel (4). The coagulation bath buffer chamber includes a buffer chamber outer wall (6). The inner wall (7) of the buffer chamber is provided with multiple rows of water inlets (5) in the circumferential direction. The receiving cavity is connected to the coagulation bath buffer chamber through the water inlets (5). The upper edge of the funnel (4) is not higher than the upper edge of the inner wall (7) of the buffer chamber. The lower end of the funnel (4) is connected to the upper end of the spinning tube (8). The spinning tube (8) passes through the bottom of the outer shell (3) of the coagulation plate, and the lower end of the spinning tube (8) is immersed in the coagulation tank (1). The height difference between the upper end face of the funnel (4) and the upper liquid surface of the coagulation tank (1) is 10mm-100mm. The upper end of the funnel (4) is provided with a creeping part (4.1), which is in the shape of an inverted bowl. The coagulation plate assembly is connected to the lifting mechanism, and the lifting mechanism controls the coagulation plate assembly to be immersed in the coagulation tank (1). The work process is as follows: First, the coagulation bath is transported through the water inlet pipe (2) to the buffer tank between the coagulation bath buffer tank and the outer shell of the coagulation plate (3). After the coagulation bath fills the buffer tank, it overflows from the top of the buffer tank into the coagulation bath buffer tank. The coagulation bath in the coagulation bath buffer tank enters the receiving cavity through the water inlet hole provided in the inner wall (7) of the buffer tank. The coagulation bath rises along the creep section at the top of the funnel (4). When the liquid level of the coagulation bath reaches the upper edge of the funnel (4), it flows into the funnel (4) and flows into the coagulation tank (1) through the spinning tube (8). Meanwhile, the coagulation bath is transported to the coagulation tank (1) by the coagulation bath inlet (10) located at the bottom of the coagulation tank (1). When the coagulation bath liquid level reaches the position of the coagulation bath outlet (11) located at the top of the coagulation tank (1), it flows out from the coagulation bath outlet (11). Then, by adjusting the depth of the coagulation plate assembly immersed in the coagulation tank (1) through the lifting mechanism connected to the coagulation plate shell (3), the height difference H between the coagulation bath liquid surface in the coagulation plate assembly and the coagulation bath liquid surface in the coagulation tank (1) is controlled, thereby controlling the flow rate of the coagulation bath in the spinning tube (8). Finally, the spinning solution filaments squeezed out from the spinneret fall into the coagulation plate assembly and come into contact with the coagulation bath. After mass and heat transfer, the filaments solidify into nascent fibers. The nascent fibers and the coagulation bath flow into the coagulation tank (1) through the funnel (4) and the spinning tube (8). The nascent fibers are then drawn out of the coagulation tank (1) after being turned by the guide wheel (9) located directly below the spinning tube (8). During the drawing process, the nascent fibers continue to solidify fully in the coagulation tank (1).

2. The dry-wet spinning coagulation apparatus as described in claim 1, characterized in that: A buffer trough is provided between the coagulation bath buffer chamber and the coagulation plate shell (3).

3. The dry-wet spinning coagulation apparatus as described in claim 2, characterized in that: A coagulation bath inlet (10) is provided below the coagulation tank (1), and a coagulation bath outlet (11) is provided above the coagulation tank (1).

4. The dry-wet spinning coagulation apparatus as described in claim 3, characterized in that: A guide wheel (9) is provided at the lower end of the center line of the spinning tube (8).

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