Method for preparing and supplying flash spinning solution

Abstract

The method for preparing and supplying the flash spinning solution comprises the following steps: a mixing preparation step: vacuumizing a mixing space; filling inert gas into the mixing space to carry out pressure rising operation, and carrying out temperature rising operation on the mixing space; feeding and mixing: controlling the interior of the mixing space to reach a first mixing pressure and a first mixing temperature; hybrid power is provided, a solvent is input into the mixing space, and then a solute is input into the solvent near the longitudinal axis of the mixing space; a quantitative mixing step: after the input solvent and solute reach respective preset amounts, continuously providing hybrid power to carry out quantitative mixing; and a supplying step: after the quantitative mixing is performed for a preset time, supplying the solution from the mixing space to the next production process. According to the method, the flash spinning solution can be prepared and supplied, the method is used for production and manufacturing of the flash spinning process, and meanwhile, the method can be matched with other structures and methods to achieve stable and continuous supply of the flash spinning solution.

Description

Technical Field

[0001] The present invention relates to the field of flash spinning, in particular to a method for preparing and supplying a flash spinning solution. Background Art

[0002] Non-woven fabric, also known as non-woven fabric, is a fabric that does not require spinning and weaving. It is composed of oriented or random fibers. It is made by arranging textile short fibers or filaments in a directional or random manner to form a fiber web structure, and then reinforced by mechanical, thermal bonding or chemical methods.

[0003] Flash spinning, also known as instant spinning, is a special case of dry spinning using a flash spinning solution. It can be used to spin ultra-long fiber filaments and non-woven fabrics, and is therefore a technology and method for producing non-woven fabrics. Non-woven fabrics produced using this method are waterproof, moisture-proof, breathable, flexible, lightweight, non-combustible, easily decomposable, non-toxic, odorless, non-irritating, colorful, and recyclable. They are internationally recognized as environmentally friendly products and a new generation of environmentally friendly materials that protect the Earth's ecology. Due to the varying lengths and thicknesses (i.e., densities) of the fibers within, flash-spun non-woven fabrics can be produced with varying thickness, feel, and hardness by varying the processing equipment and raw materials. These products are suitable for use in various applications, including industrial (automotive interiors), chemical (printing substrates), healthcare (surgical gowns, protective clothing, disinfectant wraps, masks, diapers), apparel (shoemaking, leather), household (wallpaper, furniture fabrics, decorative materials, mattresses), and agriculture (reflective film).

[0004] For more information about existing flash spinning methods, as well as related systems, equipment, and methods for flash spinning to produce non-woven fabrics, please refer to Chinese invention patent applications such as CN115595675A, CN115852592A, and CN115976665A. Summary of the Invention

[0005] The problem solved by the present invention is to provide a method for preparing and supplying flash spinning solution so that the flash spinning solution can be prepared and supplied, and at the same time, it can be combined with other structures and methods to achieve a stable and continuous flash spinning solution supply solution for the production and manufacturing of flash spinning process.

[0006] To solve the above problems, the method for preparing and supplying a flash spinning solution of the present invention comprises:

[0007] Mixing preparation step: vacuuming the mixing space; after the vacuuming operation is completed, filling the mixing space with inert gas to perform a pressure-increasing operation, and heating the mixing space; feeding and mixing step: controlling the interior of the mixing space to reach a first mixing pressure and a first mixing temperature; providing a hybrid force, inputting a solvent into the mixing space, and then inputting a solute into the solvent near the longitudinal axis of the mixing space; quantitative mixing step: after the input solvent and solute reach their respective predetermined amounts, continue to provide hybrid force for quantitative mixing; supply step: after the quantitative mixing is performed for a predetermined time, supply the solution from the mixing space to the next production process.

[0008] Compared with the prior art, the technical solution of the present invention has the following advantages:

[0009] The method for preparing and supplying flash spinning solution provided by the present invention can utilize the corresponding mixing space to mix the solutions. During the mixing and dissolving process, the solute can be safely and accurately input, and the solute can be subjected to a mixing driving action from the inside out and from the top down, so as to better match the mixing driving force, be more evenly distributed in the solvent, and be fully contacted and dissolved with the solvent, thereby ensuring the completion of the dissolution process, having a good mixing effect, and accurately controlling the dissolution time. It also helps to reduce the risk of solute accumulation and adhesion at the edge or inner wall of the mixing space, reduce agglomeration, further improve mixing uniformity, improve mixing efficiency and dissolution efficiency, and reduce energy consumption.

[0010] Furthermore, the method for preparing and supplying flash spinning solution provided by the present invention has closely coordinated steps, and uses vacuum extraction, inert gas to control pressure increase and temperature increase to create stable conditions for the mixing process. The solute is input at the center of the mixing space to ensure efficient and uniform mixing of the solvent and solute. The process of inputting the solvent and solute is reasonably arranged, and multiple steps are interconnected to fully guarantee the dissolution process. The entire method steps always control conditions such as pressure and temperature, which not only improves the mixing efficiency of the solution, but also ensures the stability of the solution. Ultimately, a uniform solution can be supplied to the next production process, ensuring the reliability and efficiency of production.

[0011] For more information about the solutions, structures, methods, properties and advantages of the present invention, please refer to the subsequent contents of this specification. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic diagram of a first cross-sectional structure of a mixing kettle provided in one embodiment of the present invention;

[0013] Figure 2 for Figure 1 A second cross-sectional structural schematic diagram of the mixing kettle shown;

[0014] Figure 3 yes Figure 1An enlarged schematic diagram of a portion of the structure of the mixing kettle shown;

[0015] Figure 4 1 is a front view schematic diagram of a solute outlet provided by one embodiment of the present invention;

[0016] Figure 5 is a bottom view schematic diagram of a solute outlet and corresponding structure provided by another embodiment of the present invention;

[0017] Figure 6 Schematic diagram of a hybrid rotating shaft and corresponding blades provided in another embodiment of the present invention.

[0018] 100 - Mixing kettle body; 100a - Upper portion; 100b - Middle portion; 100c - Lower portion; 101 - First mounting seat; 102 - Second mounting seat; 103 - Third mounting seat; 104 - Fourth mounting seat; 105 - Upper kettle edge; 106 - Lower kettle edge; 107 - Upper kettle opening; 108 - Lower kettle opening; 109 - Longitudinal axis (indicated by a dotted line); 110 - Solvent input structure; 111 - Solvent outlet; 112 - Solid pipe structure; 120 - Solute input structure; 121 - Vertical portion; 122 - Inclined portion; 123 - Solute outlet; 1231 - Sub-outlet; 130 - Mixing pressure detection and control structure; 140 - Mixing temperature liquid detection structure; 150 - Mixing baffle; 151 - Baffle fixing structure; 152 - Mixing temperature liquid fixing structure;

[0019] 200-mixing jacket; 201-heat exchange inlet; 202-heat exchange outlet; 203-temperature test structure; 204-fixed structure;

[0020] 300 - mixing drive device; 301 - mixing motor; 302 - mixing reducer; 303 - mixing frame; 304 - mixing head; 305 - mixing drive mounting base; 306 - mixing rotating shaft; 307 - mixing stirring blade; 308 - mixing stirring blade; 309 - connecting structure;

[0021] 400-external support; 401-side support structure; 402-longitudinal support structure; 403-pillar; 404-transverse reinforcement structure; 405-base structure;

[0022] H - the dividing line between the upper portion 100a and the middle portion 100b (indicated by a dotted line);

[0023] L - the dividing line between the middle portion 100b and the lower portion 100c (indicated by a dotted line);

[0024] D - distance between the solute outlet 123 and the longitudinal axis 109 (indicated by a dotted line);

[0025] R - cross-sectional radius of the mixing vessel 100 (indicated by a dotted line);

[0026] T-hollow arrow, indicating the outward orientation of the outlet plane of the solute outlet 123 (obliquely upward toward the longitudinal axis 109);

[0027] α-single curved corner between the vertical portion 121 and the inclined portion 122 of the solute input structure 120;

[0028] the angle between the outlet plane of the β-solute outlet 123 and the longitudinal axis 109 (indicated by a dotted line);

[0029] w - the gap width when the solute outlet 123 is a notched circular tube structure (indicated by a dotted line);

[0030] d—cross-sectional diameter of the mixing shaft 306 (shown by a dotted line). DETAILED DESCRIPTION

[0031] Flash spinning is difficult to implement because each step and detail presents numerous challenges that must be overcome. Detailed prior art documentation exists regarding the structure and methods of production equipment for preparing and supplying the flash spinning solution, as well as the structure and methods for continuously supplying the flash spinning solution for spinning.

[0032] An embodiment of the present invention provides a mixing kettle for preparing and supplying a flash spinning solution.

[0033] like Figures 1 to 3 As shown, the mixing kettle (not separately labeled) includes the main structures of the mixing kettle body 100, the mixing jacket 200, and the mixing drive device 300. It should be noted that in the various cross-sectional structural diagrams of the mixing kettle, only the mixing kettle body 100 and the mixing jacket 200 are shown in cross-section (hence the corresponding cross-sectional slashes), while most other structures are shown in non-cross-sectional schematic structures. This treatment is to better illustrate the various structures of the mixing kettle.

[0034] like Figure 3 As shown, the mixing kettle body 100 has an upper kettle opening 107 and a lower kettle opening 108. The upper kettle opening 107 is defined by the corresponding upper kettle edge 105, and the lower kettle opening 108 is defined by the corresponding lower kettle edge 106. Figure 1 and Figure 2 The installation of the mixing drive device 300 and the sealing of the entire structure are shown. The design of the lower kettle mouth 108 takes into account the viscosity (thickness), temperature and other characteristics of the solution to ensure the required requirements for solution output, while ensuring accurate measurement and stable delivery of the solution to ensure the continuity and stability of the entire production line. The upper kettle mouth 107 is the largest opening of the mixing kettle body 100 and is used for Figure 1 and Figure 2The external structures such as the mixing drive device 300 are installed and extend into the mixing kettle body 100. The lower kettle port 108 is used as a solution outlet for further providing the solution to the next process (such as providing it to the subsequent transfer kettle related process).

[0035] Figure 3 The mixing vessel 100 is also shown as comprising an upper portion 100a, a middle portion 100b, and a lower portion 100c. The dividing line between the upper and middle portions 100a and 100b is indicated by a dashed line H, while the dividing line between the middle and lower portions 100b and 100c is indicated by a dashed line L. The upper and lower portions 100a and 100c are essentially symmetrical, spherical cap-like structures, but they have the aforementioned different openings and other different structures. The upper portion 100a includes a number of supporting structures, such as various detection and monitoring mechanisms. The middle portion 100b is cylindrical. The three portions, namely the upper, middle, and lower portions 100a and 100b, form a roughly capsule-shaped overall structure.

[0036] The mixing kettle body 100 can be made of corresponding alloy steel or stainless steel and other materials so as to be able to withstand corresponding pressure and temperature conditions, thereby providing a corresponding dissolving and mixing environment.

[0037] like Figure 1 and Figure 2 The outer surface of the mixing jacket 200 also has a plurality of fixing structures 204, which are used to fix the mixing jacket 200 on the corresponding outer bracket 400. In this embodiment, there can be three fixing structures 204. Figure 1 and Figure 2 A fixing structure 204 is shown respectively, and it can be seen that another fixing structure 204 is not shown.

[0038] like Figure 1 and Figure 2 The outer bracket 400 mentioned above is used to install the mixing kettle on a corresponding site, such as on the ground of a production workshop. The outer bracket 400 includes a side support structure 401, a longitudinal support structure 402, a pillar 403, a transverse reinforcement structure 404 and a base structure 405. The side support structure 401 is used to fix and support the mixing jacket 200 from the side of the mixing jacket 200, the longitudinal support structure 402 is used to fix and support the mixing jacket 200 from the fixed structure 204 of the mixing jacket 200, the pillar 403 provides the main supporting force, the transverse reinforcement structure 404 is connected to each pillar 403 near the bottom, and is used to make the entire outer bracket 400 more solid and stable, and the base structure 405 is used to fix the pillar 403 on the corresponding site (such as the workshop floor). In other embodiments, outer brackets with other structures can also be used to install the mixing kettle on the corresponding site.

[0039] like Figure 1 and Figure 2 The mixing drive device 300 includes a mixing motor 301, a mixing reducer 302, a mixing frame 303, and a mixing head 304. The mixing frame 303 has structures such as a mixing transmission shaft (not shown) and a mixing coupling (not shown). Other structures of the mixing drive device 300 also include structures for mechanical sealing and auxiliary sealing. The mixing drive device 300 is used to provide hybrid power to the solute and solvent inside the mixing kettle body 100. When the corresponding power is stirring power, the mixing drive device 300 can stir the solvent and solute to achieve dissolution of the solute.

[0040] like Figure 1 The mixing drive device 300 includes a mixing rotating shaft 306 and two mixing stirring blades 307 and a mixing stirring pusher blade 308 mounted on the mixing rotating shaft 306. The mixing rotating shaft 306 is fixed to a shaft segment (not specifically labeled) extending from the mixer head 304 via a connecting structure 309. The connecting structure 309 can specifically connect the corresponding shaft segment and the mixing rotating shaft 306 by, for example, screwing. The arrangement of the connecting structure 309 at this position helps facilitate the installation of the entire mixing drive device 300 in the mixing kettle body 100. The first blade mounted from top to bottom on the mixing rotating shaft 306 is the mixing stirring blade 307, and the last blade is the mixing stirring pusher blade 308. The corresponding stirring structure of the mixing drive device 300 includes at least one mixing stirring blade 307 and at least one mixing stirring pusher blade 308, thus forming a multi-stage stirring structure. The mixing stirring blade 307 and the mixing stirring pusher blade 308 can be composed of two blades, three blades, four blades, or five blades. By combining two different blades, the mixing capability of the hybrid drive device 300 can be made more comprehensive.

[0041] refer to Figure 1 and Figure 2 The hybrid drive device 300 further includes a hybrid drive mounting seat 305, which also serves as a sealed kettle cover for sealing the hybrid kettle body 100. The hybrid drive mounting seat 305 is sealed and mounted on the upper kettle edge 105, thereby forming a Figure 3 The sealing function of the upper kettle opening 107 is shown. Sealing condition is one of the important conditions for the use of the mixing kettle provided by the embodiment of the present invention. The embodiment of the present invention is equivalent to making the mixing drive mounting seat 305 a part of the mixing kettle body 100. Such a design can fully utilize the mutual cooperation of the two structures.

[0042] refer to Figures 1 to 3The mixing kettle further includes a solvent input structure 110, a solute input structure 120, a mixing pressure detection and control structure 130, a mixing temperature detection structure, and a mixing liquid level detection structure, which are mounted on the mixing kettle body 100. The solvent input structure 110 is mounted on the upper portion 100a of the mixing kettle body 100 using a first mounting seat 101. At least a portion of the solvent input structure 110 is located inside the mixing kettle body 100, and this portion can be fixed to the inner wall of the mixing kettle body 100 via a fixed pipe structure 112. The solute input structure 120 is mounted on the upper portion 100a of the mixing kettle body 100 using a second mounting seat 102. The mixing pressure detection and control structure 130 is mounted on the upper portion 100a of the mixing kettle body 100 using a third mounting seat 103.

[0043] Figure 1 It is also shown that, in a first cross-section of the mixing vessel 100 passing through the longitudinal axis 109, the solvent input structure 110 and the solute input structure 120 are located on either side of the longitudinal axis 109. This symmetrical design facilitates the input and mixing of the solvent and solute, and also contributes to the regularity of the overall structure. The solvent input structure 110 is used to continuously input a measured amount of solvent into the mixing vessel 100. The solute input structure 120 is used to continuously input a measured amount of solute into the mixing vessel 100. The solute may first be melted in other equipment and then input into the mixing vessel 100 through the solute input structure 120. The design of the solvent input structure 110 and the solute input structure 120 ensures that the mixing vessel 100 can be maintained under substantially the same conditions, and the corresponding mixing operation can be performed without opening the vessel to add the solvent and solute.

[0044] Figure 2 It is also shown that the mixed temperature detection structure and the mixed liquid level detection structure are combined into a mixed temperature liquid detection structure 140. The mixed temperature liquid detection structure 140 is used to detect the internal liquid temperature and liquid level at the same time, and its detection part is located inside the mixing kettle body 100. Figure 2 and Figure 3 As can be seen, the mixing temperature and liquid detection structure 140 is mounted on the upper portion 100a of the mixing kettle body 100 using the fourth mounting base 104. Since the solvent is an organic substance with a typically low boiling point and easy vaporization, accurate liquid level detection is necessary to provide real-time visibility of the liquid state within the kettle. Contact-type liquid detection devices are particularly effective in achieving this precise level detection. Liquid temperature is also crucial to solution formation. Therefore, locating the detection portion of the mixing temperature and liquid detection structure 140 within the mixing kettle body 100 ensures more accurate liquid temperature detection.

[0045] Figure 1 and Figure 2It is also shown that there is at least one mixing baffle 150 inside the mixing kettle body 100. The mixing baffle 150 is fixed to the inside of the mixing kettle body 100 by a baffle fixing structure 151, and the number of mixing baffles 150 can be one or more. The mixing baffle 150 is used to prevent the formation of deeper vortices on the liquid surface during the stirring process, because deeper vortices are not conducive to the mixing of the solvent and the solute and the stability of the solution. At the same time, deeper vortices may also cause more inert gases to dissolve into the liquid, which is also not conducive to the subsequent spinning process of the spinning solution. At least a part of the mixed temperature liquid detection structure 140 is fixed on the mixing baffle 150. This structural design is conducive to protecting the mixed temperature liquid detection structure 140. The mixed temperature liquid detection structure 140 needs to be immersed in the liquid, and the stirred liquid will generate a corresponding force on the mixed temperature liquid detection structure 140, and the mixing baffle 150 can prevent the corresponding liquid force from damaging the mixed temperature liquid detection structure 140. In order to reinforce the mixed temperature liquid detection structure 140, Figure 2 It is also shown in the figure that the mixed temperature liquid detection structure 140 is fixed to the inner wall of the mixing kettle body 100 and the mixing baffle 150 by using the mixed temperature liquid fixing structure 152.

[0046] like Figure 1 and Figure 3 As shown, the solute input structure 120 includes a solute outlet 123 located inside the mixing tank body 100, and the solute outlet 123 is arranged close to the longitudinal axis 109 of the mixing tank body 100. Figure 1 and Figure 3 In FIG. 1 , the longitudinal axis 109 is shown as a longitudinal dashed line. Figure 1 and Figure 3 In the cross-section shown, it essentially bisects the mixing vessel 100 and the mixing axis 306. That is, the longitudinal axis 109 is the longitudinal center axis of the mixing vessel 100. The location of the solute outlet 123 affects the solute input location. If the solute outlet 123 is close to the inner wall of the mixing vessel 100, the solute, which is a polymer melt and has a high viscosity, may adhere to the inner wall and agglomerate, affecting the mixing and dissolution process. Therefore, the solute outlet 123 is positioned as far away from the inner wall of the mixing vessel 100 as possible, that is, close to the longitudinal axis 109 of the mixing vessel 100. This structure ensures the safe input of solutes during the mixing and dissolution process, and is driven by mixing from the inside out and from the top to the bottom, better matching the action path of the mixing driving force, more evenly distributed in the solvent, fully contacting and dissolving with the solvent, thereby enhancing the mixing effect and shortening the dissolution time. At the same time, it helps to reduce the risk of solute accumulation and adhesion on the edge or inner wall of the mixing kettle body 100, reduce agglomeration, and further improve mixing uniformity, improve mixing efficiency and dissolution efficiency, and reduce energy consumption.

[0047] The distance D between the solute outlet 123 and the longitudinal axis 109 (reference Figure 1 and Figure 3 ) is one tenth to one third of the cross-sectional radius R of the mixing kettle body 100. It should be noted that the cross-sectional area of ​​various kettle bodies generally refers to the cross-sectional area of ​​the main body thereof. In this embodiment, the cross-sectional area of ​​the mixing kettle body 100 is Figure 3 The cross section of the middle portion 100b is shown. As mentioned above, the middle portion 100b is a cylindrical structure, so its cross section is a circular ring. It can be seen that the cross section radius R is the inner diameter of the circular ring.

[0048] like Figure 1 and Figure 3 As shown, the solute input structure 120 allows the solute outlet 123 to be close to the longitudinal axis 109 of the mixing tank body 100 through the single bend structure of the pipeline. Figure 3 It is shown that the single bending structure includes a vertical portion 121 and an inclined portion 122 (that is, the solute input structure 120 includes a vertical portion 121 and an inclined portion 122), and there is a single bending angle α between the vertical portion 121 and the inclined portion 122 (it should be noted that the single bending angle α is a concept of angle size, which is equivalent to the angle formed by the symmetry axes of the main parts of the vertical portion 121 and the inclined portion 122. Therefore, Figure 3 The single bending angle α is marked at the bend position formed by the smooth transition between the vertical portion 121 and the inclined portion 122. The single bending angle α is greater than or equal to 120 degrees and less than or equal to 165 degrees, thereby ensuring that the solute outlet 123 has an outlet plane that is obliquely upward toward the longitudinal axis 109 and ensuring that the structure is stable and reliable. The outlet plane of the solute outlet 123 is oriented in a direction perpendicular to the outlet plane and outward, such as Figure 3 Shown in hollow arrow T, hollow arrow T is obliquely upward toward longitudinal axis 109, that is, outlet plane obliquely upward toward longitudinal axis 109. According to the structure of solute outlet 123, the direction indicated by hollow arrow T is exactly the direction of the initial outflow velocity of solute (initial outflow velocity is the speed at which solute flows out of solute outlet 123 at an instant). It can be seen that the initial outflow velocity has a vertical upward component and a horizontal component. Although the final solute will enter the solvent at an oblique downward speed under the action of gravity, this initial vertical upward component and the horizontal component help the solute to be input into each part of the solvent in a more dispersed manner, so that the solute dispersion range is larger, and the distribution range particularly on the cross section of the solvent is larger, which helps the solute to be more evenly distributed in the solvent and can be dispersed into the solvent faster.

[0049] like Figure 4In another embodiment, the solute outlet 123 has a sieve structure rather than a whole hole. The sieve structure includes a plurality of sub-outlets 1231, and the shape of the sub-outlet 1231 is a regular hexagon (in other embodiments, it can also be other polygons, circles or ellipses). That is, the solute outlet 123 of this embodiment has an outlet structure similar to the surface of a shower head, or a hollow structure. The reasons for this design include: although the solute is basically in liquid form, its viscosity is relatively high. After being squeezed out of the solute outlet 123, it is still easy to agglomerate. Once agglomeration occurs, it is difficult to be dissolved; and the design Figure 4 The solute outlet 123 shown in the sieve structure allows the viscous solute to be further dispersed and squeezed into the interior of the mixing kettle 100 by the multiple sub-outlets 1231, similar to the state of "squeezing noodles", so that the solute is dispersed and squeezed into multiple thin strands or multiple streams and enters the solvent. Since the solute is divided into multiple thin strands or multiple streams and enters the solvent, it can prevent solute agglomeration and promote rapid solute dissolution. For more information on other structures, properties, and functions of this embodiment, please refer to the corresponding content of the previous embodiment.

[0050] In another embodiment, the bottom view schematic structure of the solute outlet 123 is as follows: Figure 5 As shown, it can be seen that the solute outlet 123 is a notched circular tube structure, and the notched circular tube structure itself is Figure 5 The solute outlet 123 and the inclined portion 122 are in the shape of a horizontally rotated English letter "C". Figure 5 Separated by a dotted line (this dotted line is not marked), Figure 5 Only one section of the inclined portion 122 is shown. The lower surface of the notched circular tubular structure has a plurality of sub-outlets 1231, each of which is circular in shape. In other embodiments, the sub-outlets may also be polygonal or elliptical.

[0051] The solute outlet 123 is designed as a notched circular tubular structure, wherein the notch width w is greater than or equal to the cross-sectional diameter d of the mixing rotating shaft 306. This design ensures that the mixing rotating shaft 306 can smoothly pass through the notched portion of the solute outlet during installation, thereby enabling the multiple sub-outlets 1231 to be arranged around the periphery of the mixing rotating shaft 306, thereby avoiding mutual interference between the solute outlet 123 and the mixing rotating shaft 306, and without requiring the mixing rotating shaft 306 to be changed. Furthermore, since the lower surface of the solute outlet 123 has multiple sub-outlets 1231, these sub-outlets 1231 are downwardly opened as circular holes (or other shapes, such as polygonal or elliptical), which facilitates the uniform and efficient dispersion, extrusion and injection of the solute into the solvent, thereby better preventing solute agglomeration and the like, and increasing the dispersion speed and uniformity of the solute in the solvent, thereby improving the mixing effect and mixing efficiency.

[0052] like Figure 6In another embodiment, the mixing and stirring blades 307 and the mixing and stirring pushing blades 308 on the mixing rotating shaft 306 are the same in number, two each, and are installed on the mixing rotating shaft 306 at intervals, that is, from top to bottom, they are the first mixing and stirring blade 307, the first mixing and stirring pushing blade 308, the second mixing and stirring blade 307, and the second mixing and stirring pushing blade 308. The first mixing and stirring blade 307 can be a folding blade, and the second mixing and stirring pushing blade 308 can be an anchor blade. The combined stirring of the two mixing and stirring blades 307 and the two mixing and stirring pushing blades 308 further ensures the corresponding breaking up and circulation effects, so as to more fully disperse the added polymer solute and organic solvent, ensure their full contact, and promote dissolution. Among them, when the mixing rotating shaft 306 rotates, the two mixing and stirring blades 307 mainly play the role of providing radial flow, while the two mixing and stirring pushing blades 308 mainly play the role of propulsive stirring. Compared with the two mixing and stirring blades 307, the two mixing and stirring blades 308 have a moderate distance from the kettle wall, which can prevent the solute from adhering to the wall and causing coking, control the axial flow rate of the solute and solvent circulating internally, control heat exchange, prevent local temperature from being too high, prevent the solvent and solute from stratifying up and down, and promote the temperature and heat to reach the desired balance.

[0053] More about Figure 6 For other structures, properties and functions of the illustrated embodiment, reference may be made to the corresponding contents of the aforementioned embodiments.

[0054] The embodiment of the present invention also provides a method for preparing and supplying a flash spinning solution by using a mixing kettle.

[0055] The mixing kettle can be the mixing kettle provided in the above embodiments, so you can refer to Figures 1 to 6 Corresponding content. As can be seen, the mixing kettle includes main structures such as a mixing kettle body 100, a mixing jacket 200, and a mixing drive device 300. The mixing kettle body 100 has an upper kettle port 107 and a lower kettle port 108; the mixing jacket 200 is used to control the temperature of the mixing kettle body 100; the mixing drive device 300 is used to provide hybrid power for the solute and solvent within the mixing kettle body 100; the mixing kettle also includes a solvent input structure 110, a solute input structure 120, a mixing pressure detection and control structure 130, a mixing temperature detection structure, and a mixing liquid level detection structure installed in the mixing kettle body 100. The solute input structure 120 is located at the solute outlet 123 inside the mixing kettle body 100, near the longitudinal axis 109 of the mixing kettle body 100. For more information on the structure, performance, and advantages of the mixing kettle, please refer to the corresponding content of the aforementioned embodiments.

[0056] The method of preparing and supplying flash spinning solution using a mixing kettle in this embodiment includes:

[0057] Mixing preparation step: using the mixing pressure detection control structure 130 to perform a vacuum operation on the interior of the mixing kettle body 100; after the vacuum operation is completed, continue to use the mixing pressure detection control structure 130 to fill the interior of the mixing kettle body 100 with inert gas to perform a pressure increase operation, and use the mixing jacket 200 to increase the temperature of the mixing kettle body 100; feeding and mixing step: using the mixing pressure detection control structure 130, the mixing jacket 200 and the mixing temperature detection structure to control the interior of the mixing kettle body 100 to reach a first mixing pressure and a first mixing temperature; start the mixing drive device 300 to provide hybrid power, and feed the solvent into the mixing kettle body 100 through the solvent input structure 110. The solvent is input into the solvent at a position near the longitudinal axis 109 inside the mixing kettle body 100 through the solute outlet 123 of the solute input structure 120 (since the solute outlet 123 of the solute input structure 120 is located inside the mixing kettle body 100 and is close to the longitudinal axis 109 of the mixing kettle body 100, this input method can be directly implemented using the solute outlet 123); a quantitative mixing step: after the input solvent and solute reach their respective predetermined amounts, the mixing drive device 300 continues to provide hybrid power for quantitative mixing; a supply step: after the quantitative mixing is performed for a predetermined time, the solution is supplied to the next production process through the lower kettle port 108 of the mixing kettle body 100.

[0058] The above method can utilize the corresponding mixing kettle to mix solutions. During the mixing and dissolving process, the solute can be safely and accurately input, and the solute can be subjected to the mixing driving force from the inside to the outside and from the top to the bottom, so as to better match the mixing driving force, be more evenly distributed in the solvent, fully contact and dissolve with the solvent, that is, ensure the completion of the dissolution process, have a good mixing effect, and accurately control the dissolution time. It also helps to reduce the risk of solute accumulation and adhesion on the edge or inner wall of the mixing kettle body 100, reduce agglomeration, and further improve mixing uniformity, improve mixing efficiency and dissolution efficiency, and reduce energy consumption.

[0059] In the above method, the steps are closely coordinated with each other, and the operation steps such as vacuuming, controlling the pressure increase with inert gas, and heating are used to create stable conditions for the mixing process. The solute is input at the center of the mixing kettle body 100 to ensure efficient and uniform mixing of the solvent and the solute. The process of inputting the solvent and the solute is reasonably arranged, and multiple steps are interconnected to fully ensure the dissolution process. The pressure, temperature and other conditions are controlled at all times throughout the method steps, which not only improves the mixing efficiency of the solution, but also ensures the stability of the solution. Finally, a uniform solution can be supplied to the next production process, ensuring the reliability and efficiency of production.

[0060] In the mixing preparation step, before using the mixed pressure detection control structure 130 to perform a vacuum operation on the inside of the mixing kettle body 100, first ensure that the mixing kettle body 100 has been sealed and has no leaks, and at the same time ensure that the mixed pressure detection control structure 130 is in good working condition, ensuring that it can accurately detect and control the pressure inside the mixing kettle body 100. Then start the vacuum operation, monitor the changes in the vacuum degree in real time, and adjust the vacuum speed as needed to achieve the required vacuum degree. Use the mixed pressure detection control structure 130 to monitor the pressure in the mixing kettle body 100 in real time, and make corresponding operational adjustments based on the set pressure range. If the pressure reaches the set range, a corresponding signal is sent, the maintenance state is adjusted, and the next operation is waited for. It should be noted that in the mixing preparation step, a partial heating operation can also be performed first to facilitate and accelerate the vacuum operation.

[0061] In the mixing preparation step, the process of using the mixing pressure detection control structure 130 to fill the mixing kettle body 100 with inert gas can include: providing inert gas, specifically nitrogen or argon, to ensure that each connection node of the inert gas supply structure is tight and leak-free; passing the inert gas into the mixing kettle body 100 through corresponding pipes and valves. During the inert gas supply process, the corresponding valve can be slowly opened first, and the inert gas can be gradually filled into the mixing kettle body 100. The gas flow rate is controlled by using the mixing pressure detection control structure 130 to ensure that the pressure gradually rises and that the mixing pressure detection control structure 130 monitors the pressure in the mixing kettle body 100 in real time; when the pressure reaches the preset value, the inert gas supply valve is closed to maintain the inside of the mixing kettle body 100 within the corresponding stable pressure range.

[0062] During the mixing preparation step, while the mixing vessel 100 is being pressurized by injecting inert gas, the mixing jacket 200 can be used to simultaneously perform a temperature increase operation. This temperature increase operation includes activating the mixing jacket 200's corresponding power and heat source supply devices (e.g., a steam boiler burner, a hot oil pump motor, etc., not shown), controlling the flow of a heating medium (e.g., hot oil, steam, hot water, etc., not shown) through appropriate valves and connectors into the heat exchange inlet 201 of the mixing jacket 200. After the heating medium fills the mixing jacket 200, it returns to the power and heat source supply devices through the heat exchange outlet 202 of the mixing jacket 200, forming a cycle, thereby allowing the corresponding heating medium to continuously control the temperature of the mixing vessel 100. The flow rate and temperature of the heating medium are adjusted to control the temperature increase rate of the mixing vessel 100. During this process, the temperature test structure 203 of the mixing jacket 200 and the mixed temperature detection structure (mixed temperature liquid detection structure 140) can be used simultaneously to detect the internal temperature of the mixing kettle body 100 and the heating temperature of the mixing jacket 200, so as to adjust the flow rate and temperature of the heating medium as needed to maintain the desired heating curve. When the interior of the mixing kettle body 100 reaches the desired temperature, the temperature control system is adjusted to maintain a stable temperature for a period of time. At the same time, the mixed pressure detection control structure 130 is used to ensure that the pressure and temperature inside the mixing kettle body 100 are within the preset range. The corresponding preset ranges can be the first mixed pressure and the first mixed temperature.

[0063] As mentioned above, the preset ranges for temperature and pressure in the mixing preparation step are also to adjust the temperature and pressure to the first mixing pressure and the first mixing temperature. However, at the beginning of the feeding and mixing step, it is necessary to ensure that this condition is achieved. Therefore, the coordination of the mixing pressure detection control structure 130, the mixing jacket 200 and the mixing temperature detection structure is further utilized to control the interior of the mixing kettle body 100 to reach the first mixing pressure and the first mixing temperature. Therefore, when the pressure inside the mixing kettle body 100 is lower than the set first mixing pressure value, the mixing pressure detection control structure 130 increases the pressure. When the pressure is higher than the set first mixing pressure value, the mixing pressure detection control structure 130 reduces the pressure. When the pressure reaches the corresponding requirement, it is maintained. Through such a feedback adjustment mechanism, it is ensured that the pressure inside the mixing kettle body 100 is always maintained near the set first mixing pressure value. Similarly, when the temperature inside the mixing kettle body 100 is lower than the set first mixing temperature value, the mixing temperature detection structure will feed this information back to the control system. After receiving the signal, the control system will start or increase the temperature control function of the mixing jacket 200 to control the temperature of the mixing kettle body 100. When the temperature is lower than the set first mixing temperature value, heating is performed. When the temperature reaches the set first mixing temperature value, heating is stopped or maintained in a manner to maintain temperature stability (so that heat dissipation and heat supply are kept in dynamic balance). On the contrary, when the temperature is higher than the set first mixing temperature value, the control system will control the mixing jacket 200 to stop heating to appropriately cool the mixing kettle body 100 so that the temperature returns to the set first mixing temperature value. Through such a feedback regulation mechanism, it is ensured that the temperature inside the mixing kettle body 100 is always maintained near the set first mixing temperature value. In addition, before pressure regulation and temperature adjustment, in order to improve the accuracy of control, the sensors such as the mixing pressure detection control structure 130 and the mixing temperature detection structure can be correspondingly inspected, calibrated and maintained. Through the cooperation of the mixing pressure detection control structure 130 , the mixing jacket 200 and the mixing temperature detection structure, the interior of the mixing kettle body 100 is effectively controlled to reach the set first mixing pressure and first mixing temperature values.

[0064] The solvent input structure 110 is a channel for inputting the solvent into the mixing kettle body 100. The pre-prepared solvent is accurately input into the mixing kettle body 100 through the solvent input structure 110. Specifically, the solvent can be transported into the mixing kettle body 100 through the pipeline by opening the corresponding valve (not shown) of the solvent input structure 110.

[0065] The solute input structure 120 is a channel for inputting solute into the mixing kettle body 100. Through the solute input structure 120, the solute is accurately input into the mixing kettle body 100 near the longitudinal axis 109, thereby achieving the desired mixing effect. Specifically, the solute can be transported to the solute outlet 123 through a pipeline by opening the corresponding valve (not shown) of the solute input structure 120. According to the requirements of the mixing process, the input amount and input speed of the solute are controlled to ensure that the solute can be evenly dispersed in the solvent. During the process of inputting the solute, the operating parameters of the mixing drive device 300, such as the rotational speed or the stirring mode and direction, can be adjusted to promote the mixing of the solute and the solvent.

[0066] During the feeding and mixing step, the mixing drive device 300 is responsible for providing the necessary mixing power, driving the liquid within the mixing kettle 100 to achieve uniform mixing of the solvent and solute. Furthermore, parameters such as the operating speed and stirring time of the mixing drive device 300 can be controlled in real time based on the mixing requirements. Polymer solutes are molten—both melts and liquids—but are non-Newtonian fluids. Under shear, their viscosity changes with changes in shear rate or shear strain rate. The shear force is generated by the mixing and stirring force of the mixing drive device 300. Therefore, the rotational speed of the mixing drive device 300 influences the dissolution of the polymer solute in multiple ways.

[0067] During the mixing process, the mixing conditions within the mixing vessel 100 are closely monitored to understand the mixing state. This can be achieved through monitoring parameters such as temperature, pressure, and viscosity. If uneven mixing or abnormalities are detected, the operating parameters of the mixing drive device 300 or the input of solvent and solute are promptly adjusted. By activating the mixing drive device 300 and utilizing the coordinated operation of the solvent input structure 110 and the solute input structure 120, effective mixing of the solvent and solute is achieved, ensuring stable and reliable mixing.

[0068] Once the input solvent and solute have reached their respective predetermined amounts, the mixing drive 300 precisely controls the mixing speed, duration, and intensity to ensure that the solvent and solute are fully and evenly mixed. Appropriate temperature and pressure are maintained during the mixing process to achieve quantitative mixing. The predetermined amounts of solvent and solute are determined before the mixing vessel 100 begins inputting the solvent and solute. The sum of the predetermined amounts of solvent and solute is the total predetermined amount of liquid, which determines the liquid level within the mixing vessel 100.

[0069] The dissolution of a polymer solute, particularly high-density polyethylene (HDPE), in a corresponding organic solvent is a complex and multi-stage process. This process typically involves a swelling phase caused by solvent penetration and a subsequent polymer dispersion phase. During the solvent penetration phase, solvent molecules gradually penetrate between the HDPE molecular chains, causing the polymer to swell. During this phase, small organic solvent molecules continue to penetrate the polymer interior, causing significant swelling. The degree of swelling is determined by both the polymer's molecular structure and the solvent's physicochemical properties. Following the swelling phase, the polymer dispersion phase begins, during which the polymer macromolecules begin to gradually disentangle and separate, ultimately becoming uniformly dispersed in the solvent as polymer molecules, forming a stable polymer solution. When preparing a supercritical solution such as a flash spinning dope, ensuring the complete dissolution of the HDPE in the solvent is crucial. The dissolution process must be carried out at relatively high temperature and pressure to promote effective solvent penetration and sufficient swelling and dispersion of the polymer. Sufficient time is required during the quantitative mixing step to ensure full dispersion of the polymer chains, thereby producing a uniform solution. Generally speaking, the time required for the quantitative mixing step will exceed the time required for the adding mixing step. This is to ensure the sufficient dissolution of the high-density polyethylene and the uniformity of the solution.

[0070] Combined with reference Figures 1 to 3 After the quantitative mixing step, the solvent and solute have reached the desired degree of mixed dissolution. At this point, the uniformly mixed solution is transferred to the next production process using the lower kettle port 108 of the mixing kettle body 100. The lower kettle port 108 is typically connected to a corresponding structure that facilitates control of the outflow of the solution, such as a valve and a pipe interface. After the mixing process is completed, the valve (not shown) corresponding to the lower kettle port 108 is controlled, and the combined effects of pressure, mechanical power, and gravity are simultaneously utilized to allow the uniformly mixed solution to flow smoothly out of the mixing kettle body 100 and be supplied to the next production equipment (production process).

[0071] In the embodiment of the present invention, during the feeding and mixing step, the solute is introduced into the solvent. Therefore, the solvent is always introduced into the mixing vessel 100 first, followed by the solute. Furthermore, this embodiment employs a phased and batched approach to introduce the solvent and solute to their respective predetermined amounts (typically different, with the volume of solvent introduced typically being multiple times the volume of solute). Temperature and pressure are gradually controlled during the mixing process. This process is used to prepare the flash spinning solution, ensuring efficient mixing and a uniform and stable solution.

[0072] Specifically, in this embodiment, under the conditions of a first mixing temperature and a first mixing pressure, a predetermined amount of solvent is first input through the solvent input structure 110, and then a predetermined amount of solute is input through the solute input structure 120. Then, the interior of the mixing kettle 100 is controlled to reach a second mixing temperature and a second mixing pressure by the cooperation of the mixing pressure detection and control structure 130, the mixing jacket 200, and the mixing temperature detection structure. Then, a predetermined amount of solvent is input through the solvent input structure 110, and then a predetermined amount of solute is input through the solute input structure 120. Thereafter, the interior of the mixing kettle 100 is controlled to reach a third mixing temperature and a third mixing pressure by the cooperation of the mixing pressure detection and control structure 130, the mixing jacket 200, and the mixing temperature detection structure. Then, a predetermined amount of solvent is input through the solvent input structure 110, and finally, a predetermined amount of solute is input through the solute input structure 120. In this case, the first, second, and third mixing temperatures gradually decrease, and the first, second, and third mixing pressures gradually increase.

[0073] In the above process, first, under the conditions of the first mixing temperature and the first mixing pressure, a predetermined amount of one-third of the solvent is input through the solvent input structure 110. This is to establish a preliminary solvent environment in the mixing kettle body 100. Then, through the solute input structure 120, a predetermined amount of one-third of the solute is input from a position close to the middle of the solvent liquid surface so that the solute is safely input. At this time, the solute begins to contact with the solvent and preliminary mixing occurs. Then, the interior of the mixing kettle body 100 is controlled to reach the second mixing temperature and the second mixing pressure by utilizing the coordination of the mixing pressure detection control structure 130, the mixing jacket 200 and the mixing temperature detection structure. This step adjusts the mixing conditions to be suitable for further input of solvent and solute and further promotes their mixing. Because, during the second input of solvent and solute, the inert gas in the mixing kettle body 100 will be compressed and the pressure will naturally increase. In order to facilitate dissolution, this embodiment utilizes this phenomenon of natural pressure increase to increase the corresponding pressure. During this process, the mixed pressure detection and control structure 130 can be used to actively and simultaneously increase or timely adjust (to prevent excessive pressure increase) the corresponding pressure to control the pressure to the desired range, i.e., the second mixed pressure. At the same time, the corresponding temperature needs to be lowered to the second mixed temperature. This is because flash spinning solution is a dissolution under supercritical conditions, which requires both relatively high temperature and relatively high pressure conditions. The suitable temperature and pressure are usually only within a small range. When the pressure increases, the temperature needs to be lowered accordingly to ensure that the appropriate dissolution conditions are achieved. At the same time, lowering the temperature not only saves energy, but also prevents the danger of the solution with a relatively higher solubility and larger volume at this time, thereby making the entire dissolution process safer. Afterwards, that is, after the second batch of solutes is dissolved, the interior of the mixing kettle body 100 is controlled to reach the third mixed temperature and the third mixed pressure. At this time, the temperature is further reduced and the pressure is further increased. The reasons are basically the same as those mentioned above (making full use of the natural increase in pressure and lowering the temperature to reduce energy consumption and risks, etc.). Under the appropriate temperature and pressure conditions, the final third of solvent is introduced through solvent input structure 110, and finally, the final third of solute is introduced through solute input structure 120. At this point, all solvents and solutes have been introduced according to the predetermined proportions and conditions. The gradual increase in pressure and decrease in temperature also achieve a dynamic equilibrium, ensuring a smooth mixing and dissolution process.

[0074] If solute and solvent are directly input at the same time, it may happen that each of them exists in its own region. At this time, stirring is carried out again. Since the corresponding solute viscosity is high, it is easy to aggregate and stick together into agglomerates. Once aggregated and stuck together into agglomerates, it is difficult to achieve dissolution, and the corresponding production process may not be achieved. Therefore, it is necessary to pay attention to the input method of solute and solvent to prevent adverse situations such as solute aggregation and sticking together from occurring. The above-mentioned process of inputting solvent and solute in batches in stages can prevent the phenomenon of agglomeration and the like caused by inputting a large amount of polymer at one time and affecting the dissolution rate, and is more conducive to dissolution as a whole. At the same time, each stage of inputting solvent and solute in batches in stages, respectively controlling the temperature and pressure in the mixing kettle body 100, can more effectively promote the uniform distribution of solute in the solvent, help avoid the situation where the local concentration is too high or too low, thereby further improving the mixing efficiency. Finally, inputting solvent and solute in stages also helps to control mixing conditions, reduce safety risks, and prevent the occurrence of dangerous situations such as explosion or fire caused by local concentration being too high or viscosity being too large.

[0075] In this embodiment, the first mixing temperature and the first mixing pressure can be controlled to be within the ranges of 250±3°C and 8±0.5 MPa, respectively; the second mixing temperature and the second mixing pressure can be controlled to be within the ranges of 240±3°C and 13±0.5 MPa, respectively; and the third mixing temperature and the third mixing pressure can be controlled to be within the ranges of 200-220°C and 15-20 MPa, respectively. The corresponding conditions are set to ensure that the solvent and solute are dissolved under safe conditions and within the range that the mixing kettle 100 can withstand.

[0076] Under the above conditions, a relatively high temperature and a relatively low pressure are first used to promote the initial mixing and dissolution of the solvent and the solute, and then the pressure is increased and the temperature is lowered to maintain the corresponding dissolution efficiency. Finally, the temperature is lowered to a wider lower range, and the pressure is further increased to a relatively high range to ensure further dissolution of the solvent and the solute. This process not only takes into account the dissolution efficiency, but also fully considers the safety and the bearing capacity of the equipment, as well as the self-adaptation of the gas pressure and temperature (as the liquid increases at any time, the gas in the kettle is compressed, and the pressure usually increases automatically, while the newly added liquid usually has a relatively low temperature, which can easily cause the overall temperature of the liquid to drop slightly), taking into account the safety and stability of the equipment.

[0077] In this embodiment, the hybrid power provided by the hybrid drive device 300 is a mixing and stirring force; the first mixing and stirring speed at the first mixing temperature and the first mixing pressure is the initial speed; the second mixing and stirring speed at the second mixing temperature and the second mixing pressure is 0.7 to 0.9 times the initial speed; the third mixing and stirring speed at the third mixing temperature and the third mixing pressure is 0.5 to 0.7 times the initial speed; the quantitative stirring speed during the quantitative mixing step is 0.5 to 0.7 times the initial speed, while the temperature and pressure are kept substantially constant; and the supply stirring speed during the supply step is 1.1 to 1.2 times the initial speed, while the temperature is kept constant and the pressure is increased. The initial speed may be 20 to 150 revolutions per minute (r / min).

[0078] In the above-mentioned stirring conditions, at the first mixing temperature and the first mixing pressure, the mixing stirring speed is set to the initial speed, and the solvent and solute begin to contact and preliminarily mix. This initial speed is the basis for subsequent speed adjustment. When the mixing conditions become the second mixing temperature and the second mixing pressure, as the temperature and pressure change, especially the change of the liquid volume in the kettle, the speed is reduced in time, and the stirring speed is adjusted to 0.7 to 0.9 times the initial speed. At this time, the viscosity of the liquid may increase, and the stirring speed is reduced accordingly to avoid excessive stirring causing the degree of polymerization of the polymer to decrease (cracking or damage), etc. At the third mixing temperature and the third mixing pressure, the stirring speed is further reduced to 0.5 to 0.7 times the initial speed, which helps to reduce the damage of shear force to the solvent and solute and maintain the mixing effect. The solution concentration remains basically unchanged at this stage, but the liquid volume (mass) is large, and it takes longer time and milder conditions to achieve a specific mixing effect. By adjusting the stirring speed according to the changes in mixing temperature and pressure, the uniform mixing of solvent and solute can be more effectively achieved.

[0079] In the quantitative mixing step, the stirring speed is maintained at 0.5 to 0.7 times the initial speed, while the temperature and pressure remain essentially unchanged. The speed adjustment at this stage helps ensure that the mixed material can maintain a uniform and stable mixed state when the material is quantitatively added. In the supply step, the stirring speed is increased to 1.1 to 1.2 times the initial speed, while the temperature remains unchanged, but the pressure is gradually increased. The speed adjustment purpose at this stage includes simultaneously providing power for the solution to be output outwards, ensuring that the solution can be smoothly output from the mixing device, and the condition for increasing the pressure is also for outputting the solution outwards. The increased pressure needs to be ensured to be within a moderate range to prevent the solution from changing. The increased pressure is one of the power sources for the solution output, and the stirring at 1.1 to 1.2 times the initial speed provides another solution output power. This increased pressure is a dynamic increased pressure, which is used to ensure that the solution enters the next production process at an appropriate terminal pressure condition, and is also used to ensure that the solution maintains a basically stable speed when it is output from the mixing kettle body 100 (that is, the corresponding pressure can be dynamically adjusted based on the speed at which the mixing kettle body 100 outputs the solution to keep the speed as consistent as possible, or the pressure can be adjusted as needed to adjust the output speed). It can be seen that when outputting the solution, there is a coordinated effect of the two forces. Reasonable speed adjustment can ensure solution preparation and supply, reduce equipment wear and failure rate, and improve efficiency.

[0080] It should be noted that after the first supply step, the preparatory mixing step (i.e., the next round of adding and mixing, quantitative mixing, and supply steps) is no longer performed. In other words, the corresponding preparatory mixing step is omitted at this point because the mixing vessel is already fully prepared for adding and mixing, eliminating the need for re-preparation. Omitting these steps speeds up the entire preparation process, enabling rapid and continuous mixing of the solution and shortening the preparation and supply process.

[0081] refer to Figures 1 to 3 In this embodiment, the solute outlet 123 is located at a height greater than two-thirds of the height of the mixing vessel 100, and the solvent inlet 111 of the solvent inlet structure 110 extends from the lower portion 100c of the mixing vessel 100. In this manner, the method enables the inlet of solutes from a height greater than two-thirds of the height of the mixing vessel 100 and the inlet of solvents from the lower portion 100c of the mixing vessel 100. For details, reference may be made to the corresponding contents of the aforementioned embodiments.

[0082] In this embodiment, the solute outlet 123 has an outlet plane that is angled upward toward the longitudinal axis 109. The solute outlet 123 allows the solute to be introduced into the solvent at an initial, upward outflow velocity. Due to the structural characteristics of the solute outlet 123, the direction indicated by the hollow arrow T is the direction of the initial outflow velocity. Because the solute is introduced into the solvent at this angle and initial outflow velocity, it typically enters the solvent in a more dispersed manner, making it less susceptible to undesirable phenomena such as agglomeration or flocculation.

[0083] refer to Figure 1 and Figure 2 In this embodiment, the mixing drive device 300 has a mixing rotating shaft 306 and at least one mixing stirring blade 307 and at least one mixing stirring pushing blade 308 installed on the mixing rotating shaft 306; the first blade installed from top to bottom on the mixing rotating shaft 306 is the mixing stirring blade 307, and the last blade is the mixing stirring pushing blade 308; in the feeding mixing step and the quantitative mixing step, the mixing rotating shaft 306, the mixing stirring blade 307 and the mixing stirring pushing blade 308 are used to provide a composite hybrid power; in the supply step, the mixing rotating shaft 306, the mixing stirring blade 307 and the mixing stirring pushing blade 308 are used to provide a composite output power to the solution.

[0084] During the preparation of the flash spinning solution, if the temperature or pressure fails to reach the appropriate conditions, such as the temperature is too high or the pressure is too low, the solvent may vaporize (vaporization usually occurs when the temperature exceeds the boiling point of the solvent or the pressure is lower than the saturated vapor pressure of the solvent). At the same time, under inappropriate conditions, the polymer solute may not be able to disperse and dissolve, such as aggregation, degradation, cross-linking or flocculation (i.e., precipitation). Therefore, starting from the preparation step, the corresponding temperature and pressure conditions are controlled, and from the feeding step, the flow rate, flow velocity, temperature, pressure, liquid level, viscosity, stirring speed and other parameters of the solvent and solute are monitored to control the dissolution rate and degree. In the quantitative mixing step, the relevant parameters of the mixing process, including temperature, pressure, liquid level and viscosity, are monitored to prepare the corresponding solution and provide it to the next production process.

[0085] In this embodiment, in addition to temperature and pressure conditions, the stirring speed and stirring time at each step are adjusted and controlled to ensure sufficient stability during the dissolution process. Generally, excessively high stirring speeds can cause bubbles to form in the liquid, affecting the uniformity of dissolution and even causing local overheating or equipment wear. Excessively low stirring speeds can slow the dissolution process, hindering uniform dispersion of the solute in the solvent. In the initial stages of dissolution, a slightly higher stirring speed is selected to promote rapid dispersion of the solute. As the dissolution process progresses, the stirring speed is gradually reduced to better maintain a stable solution state and avoid unnecessary energy consumption and equipment wear. Excessively short stirring times can result in incomplete solute dissolution, affecting the uniformity and stability of the final solution. Excessively long stirring times can increase production costs and potentially cause undesirable conditions, such as decomposition of polymer solutes. To determine the stirring time, it is necessary to monitor the viscosity changes, temperature, and pressure of the solution during the dissolution process in real time to ensure the stirring time required to achieve a stable dissolution state. The stirring time for each step is adjusted according to these parameters to ensure the stability and efficiency of the dissolution process. When adjusting the stirring speed and stirring time, coordinate with the adjustment of temperature and pressure, and control the stirring parameters in real time to keep the dissolution process in the desired state.

[0086] Combined with reference Figure 4 In other embodiments, the solute outlet 123 may have a sieve structure, which includes multiple sub-outlets 1231. The sub-outlets 1231 are polygonal, circular, or elliptical in shape. In this case, the method can disperse the solute into the solvent through the multiple sub-outlets 1231 to further prevent adverse phenomena such as solute aggregation or flocculation.

[0087] Combined with reference Figure 5 In other embodiments, the solute outlet 123 is a notched circular tubular structure, and the lower surface of the notched circular tubular structure has a plurality of sub-outlets 1231, and the shape of the sub-outlets 1231 is polygonal, circular or elliptical; the notch width w of the notched circular tubular structure is greater than or equal to the cross-sectional diameter d of the mixing rotating shaft 306; This method can be achieved by Figure 5 The multiple sub-outlets 1231 are arranged to disperse the solute into the solvent at locations partially surrounding the mixing rotation axis 306 and close to the longitudinal axis 109 , so as to further prevent the solute from agglomerating or flocculating.

[0088] Combined with reference Figure 6In other embodiments, the mixing and stirring blades 307 and the mixing and stirring blades 308 are identical in number, two each, and are installed on the mixing rotation shaft 306 with spacing therebetween, namely, from top to bottom, the first mixing and stirring blade 307, the first mixing and stirring blade 308, the second mixing and stirring blade 307, and the second mixing and stirring blade 308. Specifically, the first mixing and stirring blade 307 can be a folding blade, and the second mixing and stirring blade 308 can be an anchor blade. The dual blades more fully disperse the added polymer solute and organic solvent, ensuring sufficient contact between them and promoting dissolution.

[0089] In other embodiments, during the material adding and mixing step, under the conditions of a first mixing temperature and a first mixing pressure, one-half of the predetermined amount of solvent can be first input through the solvent input structure 110, and then one-half of the predetermined amount of solute can be input through the solute input structure 120; then, the interior of the mixing kettle body 100 is controlled to reach a second mixing temperature and a second mixing pressure by utilizing the coordination of the mixing pressure detection control structure 130, the mixing jacket 200 and the mixing temperature detection structure, and then one-quarter of the predetermined amount of solvent is input through the solvent input structure 110, and then one-quarter of the predetermined amount of solute is input through the solute input structure 120; thereafter, the interior of the mixing kettle body 100 is controlled to reach a third mixing temperature and a third mixing pressure by utilizing the coordination of the mixing pressure detection control structure 130, the mixing jacket 200 and the mixing temperature detection structure, and one-quarter of the predetermined amount of solvent is input through the solvent input structure 110, and finally, one-quarter of the predetermined amount of solute is input through the solute input structure 120. Compared to the embodiment in which one-third of the solvent and solute are added at a time, adding one-half of the solvent and solute directly first can fully utilize the space inside the mixing kettle 100 in the early stage (at this time, the polymer is relatively less likely to agglomerate, etc., while the subsequent solution concentration increases, the solute is relatively less likely to dissolve and is relatively more likely to agglomerate). This allows for the addition of a relatively large amount of mixed solutes first, thereby further improving the dissolution effect. For more information about the method of this embodiment, please refer to the corresponding content of the previous embodiment.

[0090] The embodiments of the present invention also provide a method for preparing and supplying a flash spinning solution.

[0091] The method comprises the following steps.

[0092] Mixing preparation step: vacuuming the mixing space; after the vacuuming operation is completed, filling the mixing space with inert gas to perform a pressure-increasing operation, and heating the mixing space; feeding and mixing step: controlling the interior of the mixing space to reach a first mixing pressure and a first mixing temperature; providing a hybrid force, inputting a solvent into the mixing space, and then inputting a solute into the solvent near the longitudinal axis of the mixing space; quantitative mixing step: after the input solvent and solute reach their respective predetermined amounts, continue to provide hybrid force for quantitative mixing; supply step: after the quantitative mixing is performed for a predetermined time, supply the solution from the mixing space to the next production process.

[0093] The above method can utilize the corresponding mixing space to mix solutions. During the mixing and dissolution process, the solute can be safely and accurately input, and the solute can be subjected to the mixing driving force from the inside to the outside and from the top to the bottom, so as to better match the mixing driving force, be more evenly distributed in the solvent, and fully contact and dissolve with the solvent, thereby ensuring the completion of the dissolution process, good mixing effect, precise control of dissolution time, and helping to reduce the risk of solute accumulation and adhesion at the edge or inner wall of the mixing space, reduce agglomeration, and further improve mixing uniformity, improve mixing efficiency and dissolution efficiency, and reduce energy consumption.

[0094] In the above method, the steps are closely coordinated with each other, and the operation steps such as vacuuming, controlling the pressure increase with inert gas, and heating are used to create stable conditions for the mixing process. The solute is input at the center of the mixing space to ensure efficient and uniform mixing of the solvent and the solute. The process of inputting the solvent and the solute is reasonably arranged, and multiple steps are interconnected to fully guarantee the dissolution process. The pressure, temperature and other conditions are controlled at all times throughout the method steps, which not only improves the mixing efficiency of the solution, but also ensures the stability of the solution. Ultimately, a uniform solution can be supplied to the next production process, ensuring the reliability and efficiency of production.

[0095] The mixing space can be a corresponding mixing kettle (can be combined with reference Figures 1 to 6 The shape of the mixing space can be the shape of a capsule defined by these kettles, containers or equipment (such as Figures 1 to 4 ), in other embodiments, it may also be cylindrical. If the mixing space is in the shape of a capsule, it may be arranged vertically, and in this case, a corresponding driving device (e.g. Figure 1 and Figure 2The mixing drive device 300 shown in FIG. 3 may be arranged vertically (i.e., it may be installed at the upper portion of the mixing space so as to extend toward the lower portion of the mixing space, or it may be installed directly at the lower portion of the mixing space), or it may be arranged horizontally. In this case, the drive device providing the driving force may also be arranged horizontally. In addition, the mixing space may be arranged in an oblique spatial structure.

[0096] In the mixing preparation step, the purpose of the vacuum operation includes removing air, moisture and other components that may affect the mixing effect in the mixing space. After vacuuming, inert gas is filled in to create a pure mixing environment. Specifically, corresponding vacuum equipment can be used. For example, all openings corresponding to the mixing space are first closed (sealed) to ensure that the space isolation effect is good, and then the vacuum equipment (vacuum pump) is started to start the vacuum operation of the mixing space. Monitor the corresponding parameters to ensure that the predetermined vacuum degree is reached. According to actual needs, vacuuming can be performed multiple times to completely eliminate the corresponding gas impurities. At the same time, as in the aforementioned embodiment, this process can be combined with a heating operation to speed up the process.

[0097] When inert gas is introduced for pressurization, the inert gas used can be nitrogen or argon, to completely fill the mixing space and maintain the desired pressure range within the mixing space, providing a stable gas and pressure environment for subsequent operations. During operation, the inert gas can be delivered along the same pipeline used for vacuum extraction to fill the mixing space. The corresponding pressure gauge reading is monitored to control the rate and amount of gas injection to ensure that the pressure within the mixing space reaches the desired level. The inert gas supply valve can then be closed to ensure stable gas conditions within the mixing space.

[0098] The mixing space is heated to achieve the desired temperature and ensure mixing conditions are met. The appropriate temperature control system can be activated to heat the mixing space. The readings of the appropriate temperature detection equipment are monitored, and the heating rate and temperature are controlled to gradually bring the temperature within the mixing space to the desired level.

[0099] When performing vacuuming, inflation and heating operations, pay close attention to the readings of various instruments to ensure the safety and accuracy of the operation process.

[0100] During the material adding and mixing step, when controlling the mixing space to reach a first mixing pressure and a first mixing temperature, a corresponding pressure or pressure sensor can be used to monitor the pressure inside the mixing space, and the pressure inside the mixing space can be accurately controlled at the first mixing pressure by adjusting the amount of inert gas charged or the opening of the exhaust valve; a temperature sensor can be used to monitor the temperature inside the mixing space, and the temperature inside the mixing space can be adjusted through a temperature control system (such as a heating jacket, a hot oil circulation system, etc.) to reach the first mixing temperature.

[0101] When providing hybrid power, appropriate hybrid power providing equipment (such as a stirrer, rotary mixer, etc.) can be selected according to the mixing requirements, and the hybrid power providing equipment can be started to provide the necessary hybrid power so that the materials in the mixing space can be mixed under the action of power.

[0102] In the present embodiment, the solvent is first input, and the amount of the required solvent can be calculated according to the requirements of the flash evaporation formula, and the solvent is accurately calculated and input into the mixing space using a metering device in advance. The input of the solvent should be uniform and slow to avoid causing too large a disturbance to the mixing process. Then the solute is input into the solvent near the longitudinal axis of the mixing space. This positioning input can ensure the full mixing of the solute. Specifically, the corresponding insertion structure can be used to accurately input the solute into the existing solvent near the longitudinal axis of the mixing space, so that the solute is evenly dispersed in the solvent. The input speed of the solute can be controlled to avoid phenomena such as local agglomeration of the solute in the solvent. During the mixing process, the changes in the pressure, temperature and viscosity inside the mixing space, as well as the normal mixing, are detected. The parameters of the mixing (such as stirring speed, mixing time, etc.) are adjusted as needed to achieve the smooth input of the solvent and the solute, providing a good basis for subsequent full mixing.

[0103] During the quantitative mixing step, after the input solvent and solute have reached their respective predetermined amounts, the hybrid force continues to be provided for quantitative mixing. However, the hybrid force can be adjusted. For example, parameters of the hybrid force providing device, such as the stirring speed, can be adjusted based on the liquid level, viscosity, temperature, and pressure at that time. The temperature and pressure can also be adjusted to ensure stable operation of the mixing device and sufficient mixing of the liquids in the mixing space.

[0104] The control of mixing time needs to be set and adjusted according to production requirements and solution quality. The mixing time should be long enough to ensure that the solvent and solute are fully mixed and evenly in the mixing space, but it should not be too long, otherwise it will affect production efficiency and may also affect the degree of polymerization of the polymer. A timing system can be used to automatically record the mixing time to ensure the accuracy of the mixing process. During the mixing process, the state of the mixed solution, such as viscosity, temperature, and pressure, is monitored in real time to determine the mixing uniformity and adjust the parameters in a timely manner as needed. For example, if problems such as uneven mixing or too slow mixing speed are found during the mixing process, the parameters of the mixing equipment can be adjusted according to the actual situation, such as increasing the stirring speed.

[0105] When the mixing time reaches the set value and the mixed solution is confirmed to be uniform through detection, it is ready to proceed to the next step.

[0106] The supply step starts after the quantitative mixing is carried out for a predetermined time. This step is to supply the solution from the mixing space to the next production process, which is also a key step. First, the mixing end needs to be confirmed to ensure the uniformity and viscosity of the mixed solution, and then the hybrid power supply equipment needs to keep stirring to avoid unstable composition of the solution during the outward supply process. Then prepare the corresponding pipes or channels, such as corresponding pipes and valves, etc., for supplying the solution from the mixing space to the transfer space. That is, open the connecting valve or pipe between the mixing space and the transfer space to ensure that the solution can be smoothly output from the mixing space and input into the transfer space. During the supply transfer process, closely monitor the flow rate and speed of the solution to ensure that it is within the specified range to avoid adverse conditions such as blockage caused by changes in the composition of the solution. When the solution in the mixing space is fully supplied to the next production process, close the corresponding pipes and valves, and confirm whether the mixing space is ready to re-prepare the solution and prepare for the next operation.

[0107] When appropriate, the mixing space and its supporting equipment can be inspected and maintained to ensure that it is clean and free of contamination, check the wear and tear of the equipment, and be ready for the next production.

[0108] In other embodiments of the present invention, a method of inputting solvent and solute in stages and batches is adopted for mixing. Specifically, in the feeding and mixing step, under the conditions of a first mixing temperature and a first mixing pressure, first input a predetermined amount of one-third of the solvent, and then input a predetermined amount of one-third of the solute; then control the mixing space to reach a second mixing temperature and a second mixing pressure, input a predetermined amount of one-third of the solvent, and then input a predetermined amount of one-third of the solute; thereafter control the mixing space to reach a third mixing temperature and a third mixing pressure, input a predetermined amount of one-third of the solvent, and finally input a predetermined amount of one-third of the solute. Reference may be made to the contents of the aforementioned corresponding embodiments.

[0109] In other embodiments of the present invention, in the step of adding and mixing, under the conditions of a first mixing temperature and a first mixing pressure, one-half of the predetermined amount of solvent is first introduced, followed by one-half of the predetermined amount of solute; the mixing space is then controlled to reach a second mixing temperature and a second mixing pressure, one-quarter of the predetermined amount of solvent is introduced, followed by one-quarter of the predetermined amount of solute; thereafter, the mixing space is controlled to reach a third mixing temperature and a third mixing pressure, one-quarter of the predetermined amount of solvent is introduced, and finally one-quarter of the predetermined amount of solute is introduced. Reference may be made to the contents of the aforementioned corresponding embodiments.

[0110] The first mixing temperature, the second mixing temperature and the third mixing temperature are gradually reduced, and the first mixing pressure, the second mixing pressure and the third mixing pressure are gradually reduced. Reference may be made to the contents of the aforementioned corresponding embodiments.

[0111] The ranges of the first mixing temperature and the first mixing pressure are 250±3°C and 8±0.5MPa, respectively; the ranges of the second mixing temperature and the second mixing pressure are 240±3°C and 13±0.5MPa, respectively; the ranges of the third mixing temperature and the third mixing pressure are 200-220°C and 15-20MPa, respectively. Please refer to the contents of the corresponding embodiments above.

[0112] The first mixing stirring speed at the first mixing temperature and the first mixing pressure is the initial speed; the second mixing stirring speed at the second mixing temperature and the second mixing pressure is 0.7 to 0.9 times the initial speed; the third mixing stirring speed at the third mixing temperature and the third mixing pressure is 0.5 to 0.7 times the initial speed; the quantitative stirring speed in the quantitative mixing step is 0.5 to 0.7 times, keeping the temperature and pressure basically unchanged; the supply stirring speed in the supply step is 1.1 to 1.2 times, keeping the temperature unchanged and increasing the pressure, and reference can be made to the corresponding contents of the aforementioned embodiments.

[0113] After the first supply step, the mixing preparation step is no longer performed, that is, the next round of feeding and mixing steps, quantitative mixing steps and supply steps are performed. When the mixing space is mixed for the first time, it is usually necessary to proceed in the order of mixing preparation steps, feeding and mixing steps, quantitative mixing steps and supply steps. After completing a round of supply, the mixing space will re-enter the next round of mixing, but at this time, since the initial mixing preparation work has been completed, the mixing preparation step can be omitted. The starting point for re-entering a new round of process is the feeding and mixing step, which means that from this step, the subsequent steps (quantitative mixing, supply) will be repeated. This design optimizes the production process and avoids unnecessary mixing preparation work in each cycle. Please refer to the corresponding content of the aforementioned embodiment.

[0114] The solute is input from a height position of more than two-thirds of the mixing space, and the solvent is input from the bottom of the mixing space. When the solute is input from a height position of more than two-thirds of the mixing space, it can directly fall into the existing solvent and be dispersed into the solvent from a higher position in the mixing space, preventing the initial input from the edge, thereby preventing uneven distribution. As the mixing process proceeds, the solute will gradually disperse in the solvent and eventually achieve uniform mixing. The solvent is input from the bottom, which, on the one hand, separates it from the solute at a greater distance at the beginning, helps to prevent corresponding influences, and on the other hand, helps the mixing process. Reference can be made to the corresponding contents of the aforementioned embodiments.

[0115] In the present embodiment, solute is input in the solvent with the initial outflow velocity (initial outflow velocity now is the speed that enters into the mixing space moment in other structures such as pipeline) obliquely upward.The speed obliquely upward means that the solute initial outflow velocity has vertical component and horizontal component.Although under gravity, final solute will enter in the solvent with the speed obliquely downward, this initial vertical component and horizontal component help solute to be input into each part of solvent in a more dispersed manner, make the solute dispersion range bigger, the distribution range particularly on the cross section of solvent is bigger, help solute to be more evenly distributed in solvent, can be dispersed into faster in solvent.This method can more promote the rapid mixing of solute and solvent than simple vertical input solute, can refer to the corresponding content of foregoing embodiment.

[0116] In other embodiments, the solute can be dispersed and input into the solvent in a sieve state. The sieve state referred to in the present invention means that the solute is decomposed into multiple thin streams or thin strips, so that it enters the solvent in a more dispersed and uniform state. The sieve structure can be various types of sieve hollow grid structures, which can separate the solute into smaller inflow units, thereby increasing the contact area between the solute and the solvent. By adjusting the pore size of the sieve hollow grid structure, the sieve size distribution of the solute can be controlled. The solute is dispersed and input into the solvent in a sieve state. It can further avoid local concentration of the solute in the solvent, prevent uneven mixing or agglomeration. The sieved solute can dissolve or disperse in the solvent faster, thereby improving the mixing efficiency. Sieving also helps to reduce the sedimentation rate of the solute in the solvent, allowing it to remain suspended for a longer time, which is further conducive to promoting mixing. Please refer to the corresponding content of the above embodiment.

[0117] In other embodiments, the solute is dispersed and introduced into the solvent at positions partially surrounding and close to the longitudinal axis of the mixing space.

[0118] During the material addition and mixing steps and the quantitative mixing step, a composite hybrid force is provided to the mixing space; during the supply step, a composite output power is provided to the solution. The composite hybrid force can be achieved using different stirring blade structures, such as one or more of propeller-type stirring blades, anchor-type stirring blades, paddle-type stirring blades, or turbine-type stirring blades, and their installation positions and order can be adjusted accordingly. Please refer to the corresponding content of the previous embodiment.

[0119] For the content of each embodiment of supplying the solution to the next production process, reference may be made to the corresponding content of the subsequent embodiments of this specification.

[0120] In order to simplify the content, this specification has largely avoided duplication in the composition, properties, functions, principles, effects and advantages of the same or similar structures and method steps between the various embodiments. Therefore, the composition, properties, functions, principles, effects and advantages of the different embodiments of this specification can be referenced and supplemented by each other.

[0121] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them. The technical solutions described in the embodiments may be modified, or some or all of the technical features therein may be replaced by equivalents. The technical features designed in different implementation modes may be combined with each other as long as they do not conflict with each other, and the corresponding technical solutions shall not deviate from the scope of protection required by the present invention. All other embodiments obtained based on the embodiments of the present invention without creative work shall fall within the scope of protection of the present invention.

Claims

1. A method for preparing and supplying a flash spinning solution, characterized in that: include: Mixing preparation step: performing a vacuum operation on the mixing space; after completing the vacuum operation, filling the mixing space with an inert gas to perform a pressure-increasing operation, and performing a temperature-increasing operation on the mixing space; Adding and mixing step: controlling the interior of the mixing space to reach a first mixing pressure and a first mixing temperature; providing a hybrid power to input a solvent into the mixing space, and then inputting a solute into the solvent near the longitudinal axis of the mixing space; Quantitative mixing step: after the input solvent and solute reach their respective predetermined amounts, continue to provide a mixing force to perform quantitative mixing; Supplying step: After the quantitative mixing is performed for a predetermined time, the solution is supplied from the mixing space to the next production process.

2. The method for preparing and supplying a flash spinning solution according to claim 1, wherein: In the adding and mixing step, under the conditions of the first mixing temperature and the first mixing pressure, first one-third of the predetermined amount of solvent is introduced, and then one-third of the predetermined amount of solute is introduced; then the mixing space is controlled to reach a second mixing temperature and a second mixing pressure, and then one-third of the predetermined amount of solvent is introduced, and then one-third of the predetermined amount of solute is introduced; thereafter, the mixing space is controlled to reach a third mixing temperature and a third mixing pressure, and one-third of the predetermined amount of solvent is introduced, and finally one-third of the predetermined amount of solute is introduced; or, In the adding and mixing step, under the conditions of the first mixing temperature and the first mixing pressure, first half of the predetermined amount of solvent is introduced, and then half of the predetermined amount of solute is introduced; then the mixing space is controlled to reach a second mixing temperature and a second mixing pressure, and then a quarter of the predetermined amount of solvent is introduced, and then a quarter of the predetermined amount of solute is introduced; thereafter, the mixing space is controlled to reach a third mixing temperature and a third mixing pressure, and a quarter of the predetermined amount of solvent is introduced, and finally a quarter of the predetermined amount of solute is introduced; The first mixing temperature, the second mixing temperature and the third mixing temperature are gradually reduced, and the first mixing pressure, the second mixing pressure and the third mixing pressure are gradually reduced.

3. The method for preparing and supplying a flash spinning solution according to claim 2, wherein: The ranges of the first mixing temperature and the first mixing pressure are 250±3°C and 8±0.5MPa respectively; the ranges of the second mixing temperature and the second mixing pressure are 240±3°C and 13±0.5MPa respectively; the ranges of the third mixing temperature and the third mixing pressure are 200-220°C and 15-20MPa respectively.

4. The method for preparing and supplying a flash spinning solution according to claim 3, wherein: The first mixing stirring speed at the first mixing temperature and the first mixing pressure is the initial speed; The second mixing stirring speed at the second mixing temperature and the second mixing pressure is 0.7 to 0.9 times the initial speed; the third mixing stirring speed at the third mixing temperature and the third mixing pressure is 0.5 to 0.7 times the initial speed; the quantitative stirring speed in the quantitative mixing step is 0.5 to 0.7 times, keeping the temperature and pressure basically unchanged; the supply stirring speed in the supply step is 1.1 to 1.2 times, keeping the temperature unchanged and increasing the pressure.

5. The method for preparing and supplying a flash spinning solution according to claim 1, wherein: After the first supplying step, the mixing preparation step is no longer performed, and the next round of the adding and mixing step, the quantitative mixing step and the supplying step is performed.

6. The method for preparing and supplying a flash spinning solution according to claim 1, wherein: The solute is introduced from a position more than two-thirds of the height of the mixing space, and the solvent is introduced from the bottom of the mixing space.

7. The method for preparing and supplying a flash spinning solution according to claim 1, wherein: The solute is introduced into the solvent at an initial upward efflux rate.

8. The method for preparing and supplying a flash spinning solution according to claim 1, wherein: The solute is dispersed and input into the solvent in a sieve state.

9. The method for preparing and supplying a flash spinning solution according to claim 1, wherein: In the adding and mixing step and the quantitative mixing step, a compound hybrid power is provided to the mixing space; and in the supplying step, a compound output power for the solution is provided to the mixing space.

10. The method for preparing and supplying a flash spinning solution according to claim 9, wherein: The solute is introduced into the solvent at locations partially surrounding and proximate to the longitudinal axis of the mixing space.

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