High-yellowing-resistant and phenol-yellow-resistant TPU monofilament fiber and preparation equipment thereof

Abstract

The present application relates to the technical field of fiber preparation, in particular to a high anti-yellowing and phenol yellow-resistant TPU monofilament fiber and a preparation device, comprising a mixing shell, a center installation frame arranged at the upper end of the mixing shell, a center mixing bin, an outer surface of which is designed with a height adjustment thread, a height adjustment thread pipe, an inner surface of which is connected with the height adjustment thread through a thread, an outer ring gear ring rotatably arranged at the inner side of the upper end of the mixing shell, a driving motor, an output end of which is fixedly provided with a driving gear, a barrel-shaped stirring frame fixedly arranged at the lower surface of the positioning installation frame, a peripheral stirring pipe arranged at the outer side of the barrel-shaped stirring frame, an inwardly extending rod slidably arranged in the peripheral stirring pipe, and the height adjustment structure and the double-layer structure are innovatively designed, so that the mixing efficiency of the device can be flexibly and accurately controlled, diversified mixing output modes such as sandwich material output can be achieved, the collaborative processing requirements of various different materials can be met, the material ratio scheme is optimized, and the anti-yellowing capability of the TPU monofilament fiber is significantly enhanced.

Description

Technical Field

[0001] This invention relates to the field of fiber preparation technology, and in particular to a high-resistance to yellowing and phenolic yellowing-resistant TPU monofilament fiber and its preparation equipment. Background Technology

[0002] TPU monofilament fiber is a single-fiber material made from thermoplastic polyurethane elastomer (TPU) through a specialized spinning process. It possesses high strength, high toughness, and good softness, and is widely used in footwear, sports equipment, and industrial textiles. In the preparation of TPU monofilament fibers, material mixing equipment is a crucial step, requiring core equipment such as high-speed mixers, multi-material blending equipment, uniform mixing and stirring devices, and specialized mixers. High-speed mixers, through their integrated crushing and stirring design, improve the mixing efficiency of TPU particles and additives. Multi-material blending equipment employs bottom heating and uniform stirring technology to solve the problems of uneven mixing and heating in traditional equipment. Uniform mixing and stirring devices, through their tilting tank design, accelerate the mixing speed of TPU materials and improve thoroughness. Furthermore, specialized equipment such as horizontal mixers and twin-ribbon mixers can be selected according to production needs to ensure that TPU materials are thoroughly mixed with antioxidants, UV absorbers, and other additives, providing a uniform and stable raw material for subsequent melt spinning.

[0003] Currently, TPU monofilament fibers on the market are prone to yellowing due to external pollution during long-term use. To improve this situation, it is necessary to explore and adopt a more scientific and reasonable material ratio scheme. At the same time, although the existing fiber preparation and mixing devices can stir and mix a variety of raw materials, their simple structural design and limited mixing function make them difficult to meet the ever-increasingly complex mixing needs. Summary of the Invention

[0004] To overcome the technical defects of the existing technology, the present invention provides a high-anti-yellowing and phenol-yellowing-resistant TPU monofilament fiber and its preparation equipment, so as to improve the anti-yellowing effect of TPU monofilament fiber and increase the mixing effect of fiber materials.

[0005] The technical solution adopted in this invention is: a preparation device for high-resistance to yellowing and phenolic yellowing TPU monofilament fibers, comprising:

[0006] The hybrid shell has a positioning leg at the bottom and a central mounting frame at the top, with limiting blocks evenly designed on the inner side.

[0007] The central mixing chamber is slidably installed in the central mounting frame for uniform mixing of materials at the central axis position. A limiting groove is opened on the outside to slide and connect with the limiting block, and the outer surface is designed with height adjustment threads.

[0008] A central stirring structure is located at the center of the central mixing chamber, providing the power for stirring the raw materials;

[0009] The height-adjusting threaded tube is rotatably installed on the lower surface of the central mounting frame, and its inner surface is connected to the height-adjusting threaded tube by a thread.

[0010] The height adjustment gear ring is fixed at the upper end of the height adjustment threaded tube and is used to drive the height adjustment threaded tube to rotate.

[0011] A height-adjusting motor is installed on one side of the central mounting frame, and a power gear that meshes with the height-adjusting gear ring is fixedly installed at its output end;

[0012] The outer ring gear is rotatably mounted on the inner side of the upper end of the mixing shell, and its interior is designed with a positioning mounting bracket that fits against the outer surface of the central mixing chamber.

[0013] A drive motor is fixedly installed on the outer surface of the mixing shell, and a drive gear that meshes with the outer ring gear is fixed at its output end;

[0014] A barrel-shaped mixing rack is fixed to the lower surface of the positioning mounting frame, and its inner surface is in contact with the outer surface of the central mixing chamber;

[0015] The outer stirring tubes are evenly arranged on the outside of the barrel-shaped stirring frame for stirring the surrounding materials;

[0016] An inwardly extending rod is slidably installed inside the outer stirring tube to improve the stirring effect at the center of the device. A support spring is fixedly installed between one end of the rod and the outer stirring tube.

[0017] Preferably, a centralized funnel is designed at the lower end of the mixing shell, an electromagnetic control valve is installed at the output end of the centralized funnel, an external feeding nozzle is designed on one side of the upper end of the mixing shell, and the upper end of the positioning leg is fixedly welded to the centralized funnel.

[0018] Preferably, a central solenoid valve for remote control is installed at the lower end of the central mixing chamber, and the output hole at its lower end corresponds to the center position of the centralized funnel. A fixed mounting plate is designed inside the upper end, and a central feeding nozzle is set at the upper end of the central mixing chamber in the opposite direction to the peripheral feeding nozzle.

[0019] Preferably, the central stirring structure includes:

[0020] The stirring linear motor, fixed on the mounting plate, is the power source for driving the central stirring structure.

[0021] The triangular stirring rod is uniformly welded to the output end of the stirring linear motor, and different directions of rotation can provide different stirring effects.

[0022] Preferably, a rotation positioning groove is formed on the inner side of the upper end of the hybrid housing, and a power connection hole is designed on one side of the rotation positioning groove. The height adjustment gear ring is rotatably installed in the rotation positioning groove, and one side of the drive gear passes through the power connection hole.

[0023] Preferably, the positioning mounting frame and the outer gear ring are integrally formed, and a stabilizing connecting rod is provided on the inner side of the frame to be fixedly connected to the outer gear ring. At the other end of the stabilizing connecting rod, an installation collar is designed to fit outside the central mixing chamber. The upper end of the barrel-shaped mixing frame is fixedly connected to the lower surface of the installation collar.

[0024] Preferably, the outer stirring tubes are respectively embedded in the barrel-shaped stirring frame, and the outer end of the outer stirring tube is sealed. The inward extension rod is installed on the inner end of the outer stirring tube, and the extension end of the inward extension rod is chamfered.

[0025] A highly resistant TPU monofilament fiber to yellowing and phenolic yellowing is prepared using a manufacturing equipment. The preparation method is as follows: a modified hindered phenolic primary antioxidant is prepared in a 1:0.8 ratio with a compound phosphite secondary antioxidant and 0.5% trimethylolpropane. The mixed additives are added to polyurethane resin, mixed evenly, and then extruded into a screw for melt spinning. The primary antioxidant has hydrogen atoms, which combine with alkyl free radicals and peroxy free radicals generated in the reaction with oxides to terminate the chain reaction. The secondary antioxidant reduces the alcohol with hydroperoxides, preventing it from cracking into free radicals and inhibiting yellowing. The production of phenolic yellowing is prevented by introducing trimethylolpropane for acid-base neutralization. After cooling in a water bath and being drawn by high-ratio radial hot water, ordered molecular chains are formed with uniform microcrystalline region size.

[0026] The beneficial effects of this invention are: by means of the innovative design of the height adjustment structure and the double-layer structure, the mixing efficiency of the device can be flexibly and precisely controlled, which can not only achieve a variety of mixed output modes such as sandwich material output, meet the collaborative processing needs of a variety of different materials, and greatly improve the efficiency of material processing and the comprehensive application effect; but also optimize the material ratio scheme on this basis, and significantly enhance the anti-yellowing ability of TPU monofilament fibers. Attached Figure Description

[0027] Figure 1 This is a side sectional view of the present invention.

[0028] Figure 2 This is a schematic diagram of the structure of the present invention.

[0029] Figure 3 This is a schematic diagram of the internal structure of the present invention.

[0030] Figure 4 This is a schematic diagram of the structure of the hybrid outer shell portion in this invention.

[0031] Figure 5 This is a schematic diagram of the barrel-shaped stirring rack in this invention.

[0032] Figure 6 This is a structural connection diagram of the central mixing chamber portion of the present invention.

[0033] Explanation of reference numerals in the attached drawings: 1. Mixing shell; 101. Positioning leg; 102. Central mounting frame; 103. Electromagnetic control valve; 104. Peripheral feeding nozzle; 2. Central mixing chamber; 201. Central solenoid valve; 202. Fixed mounting plate; 203. Central feeding nozzle; 3. Central stirring structure; 301. Stirring linear motor; 302. Triangular stirring rod; 4. Height adjustment threaded pipe; 5. Height adjustment gear ring; 6. Height adjustment motor; 7. Outer gear ring; 8. Drive motor; 9. Barrel-shaped stirring frame; 10. Peripheral stirring pipe; 11. Inward extension rod; 12. Support spring. Detailed Implementation

[0034] The present invention will be further described below with reference to the accompanying drawings:

[0035] like Figures 1-6 As shown, this embodiment provides an apparatus for preparing high-resistance to yellowing and phenolic yellowing-resistant TPU monofilament fibers, including:

[0036] The mixing shell 1 has a positioning support leg 101 at its lower end and a central mounting frame 102 at its upper end, with limiting blocks evenly arranged on its inner side; the lower end of the mixing shell 1 has a centralized funnel, and an electromagnetic control valve 103 is installed at the output end of the centralized funnel; the upper side of the mixing shell 1 has an outer feeding nozzle 104, and the upper end of the positioning support leg 101 is fixedly welded to the centralized funnel.

[0037] In this high-resistance to yellowing and phenolic yellowing TPU monofilament fiber preparation equipment, the mixing shell 1 serves as the main structure, with the lower positioning support leg 101 providing stable support, the upper central mounting frame 102 facilitating component installation, and the inner limiting block aiding in the positioning of internal components; the centralized funnel collects materials, and the electromagnetic control valve 103 precisely controls material output; the peripheral feeding nozzle 104 facilitates the input of raw materials from one side, and the positioning support leg 101 is fixedly welded to the centralized funnel to ensure structural stability. The overall structure provides a reliable guarantee for achieving stable mixing and precise output of TPU monofilament fiber raw materials.

[0038] The central mixing chamber 2 is slidably installed in the central mounting frame 102 for uniform mixing of materials at the central axis position. A limiting groove is opened on the outside to slide and connect with the limiting block, and the outer surface is designed with height adjustment threads. The lower end of the central mixing chamber 2 is equipped with a central solenoid valve 201 for remote control. The output hole at the lower end of the valve corresponds to the center position of the centralized funnel. A fixed mounting plate 202 is designed inside the upper end. The central feeding nozzle 203 is set at the upper end of the central mixing chamber 2 in the opposite direction to the outer feeding nozzle 104.

[0039] The central mixing chamber 2 is slidably installed within the central mounting frame 102. With the cooperation of the outer limiting groove and the limiting block, it can be stably positioned at the central axis, ensuring that the materials are mixed evenly within it. The height adjustment thread design allows for flexible adjustment of its height position. The central solenoid valve 201 installed at the lower end can be remotely controlled to precisely control the material discharge, and its output hole corresponds to the center of the centralized funnel, ensuring smooth material output. The upper internal fixed mounting plate 202 can be used to install related components. The central feeding nozzle 203 is set in the opposite direction to the outer feeding nozzle 104, providing convenience for the feeding of different raw materials, optimizing the feeding process, and improving the overall preparation efficiency and quality.

[0040] The central stirring structure 3 is located at the center of the central mixing chamber 2, providing the power for stirring the raw materials; the central stirring structure 3 includes:

[0041] The stirring linear motor 301 is fixed on the fixed mounting plate 202 and is the power source for driving the central stirring structure 3; the triangular stirring rod 302 is uniformly welded to the output end of the stirring linear motor 301, and different directions can provide different stirring effects.

[0042] The central stirring structure 3 is located at the center of the central mixing chamber 2, providing the core power for raw material stirring. The linear stirring motor 301 is fixed to the mounting plate 202, serving as the power source for the entire stirring structure and providing stable power output. The triangular stirring rods 302 are uniformly welded to the output end of the linear stirring motor 301. Their unique triangular shape expands the stirring range, and different stirring effects can be produced by changing the direction of rotation, effectively enhancing the uniformity and thoroughness of raw material mixing, improving the mixing quality of the high-yellowing-resistant and phenol-yellowing-resistant TPU monofilament fiber raw material, and thus ensuring the performance of the final product.

[0043] The height adjustment threaded tube 4 is rotatably mounted on the lower surface of the central mounting frame 102, and its inner surface is connected to the height adjustment thread by a thread; the height adjustment gear ring 5 is fixed on the upper end of the height adjustment threaded tube 4 and is used to drive the height adjustment threaded tube 4 to rotate; the height adjustment motor 6 is mounted on one side of the central mounting frame 102, and its output end is fixedly mounted with a power gear that meshes with the height adjustment gear ring 5.

[0044] In this equipment structure, the height adjustment threaded tube 4 is rotatably mounted on the lower surface of the central mounting frame 102 and threadedly connected to the height adjustment thread of the central mixing chamber 2. The height adjustment of the central mixing chamber 2 can be achieved by rotation. The height adjustment gear ring 5 is fixed on the upper end of the height adjustment threaded tube 4 and can transmit rotational power to the height adjustment threaded tube 4. The height adjustment motor 6 is mounted on one side of the central mounting frame 102. The power gear at its output end meshes with the height adjustment gear ring 5, which can precisely drive the height adjustment gear ring 5 to rotate, thereby driving the height adjustment threaded tube 4 to rotate. Ultimately, the height of the central mixing chamber 2 is automatically and precisely adjusted, meeting the requirements of different preparation processes for the position of the central mixing chamber 2, and improving the flexibility and adaptability of the equipment.

[0045] The outer ring gear 7 is rotatably mounted on the inner side of the upper end of the mixing shell 1, and its interior is designed with a positioning mounting bracket that fits against the outer surface of the central mixing chamber 2; the drive motor 8 is fixedly mounted on the outer surface of the mixing shell 1, and its output end is fixed with a drive gear that meshes with the outer ring gear 7; the barrel-shaped stirring frame 9 is fixed on the lower surface of the positioning mounting bracket, and its inner surface fits against the outer surface of the central mixing chamber 2.

[0046] The outer gear ring 7 is rotatably mounted on the inner side of the upper end of the mixing shell 1. It is attached to the outer surface of the central mixing chamber 2 with the help of the internal positioning mounting bracket, which plays a role in stable support and positioning. The drive motor 8 is fixed on the outer surface of the mixing shell 1. Its output drive gear meshes with the outer gear ring 7, which can precisely drive the outer gear ring 7 to rotate. The barrel-shaped stirring rack 9 is fixed on the lower surface of the positioning mounting bracket and is attached to the outer surface of the central mixing chamber 2. It rotates with the outer gear ring 7 and can stir the raw materials around the central mixing chamber 2. It works with the central stirring structure 3 to form a multi-dimensional stirring mode, which can effectively improve the uniformity and efficiency of raw material mixing, enhance the mixing effect of high anti-yellowing and phenol-yellowing TPU monofilament fiber raw materials, and ensure product quality.

[0047] A rotating positioning groove is opened on the inner side of the upper end of the mixing shell 1. A power connection hole is designed on one side of the rotating positioning groove. The height adjustment gear ring 5 is rotatably installed in the rotating positioning groove, and the drive gear passes through the power connection hole on one side. The positioning mounting bracket and the outer ring gear ring 7 are integrally molded. A stabilizing connecting rod is set on the inner side of its perimeter and is fixedly connected to the outer ring gear ring 7. An installation collar is designed at the other end of the stabilizing connecting rod and is fitted outside the central mixing chamber 2. The upper end of the barrel-shaped mixing frame 9 is fixedly connected to the lower surface of the installation collar.

[0048] The rotating positioning groove on the inner side of the upper end of the mixing shell 1 provides rotation space and positioning for the height adjustment gear ring 5. The power connection hole allows the drive gear to pass through and mesh with the height adjustment gear ring 5, ensuring power transmission. The positioning mounting bracket is integrally formed with the outer ring gear ring 7, and is equipped with a stabilizing connecting rod and mounting collar, which not only enhances the overall structural strength, but also stably mounts it on the outside of the central mixing chamber 2. The barrel-shaped stirring rack 9 is fixedly connected to the mounting collar and can rotate with the outer ring gear ring 7 to stir the raw materials around the central mixing chamber 2. It works in conjunction with the central stirring structure 3 to improve the uniformity and efficiency of raw material mixing from multiple dimensions, effectively ensuring the preparation quality of high anti-yellowing and phenol-yellowing TPU monofilament fibers.

[0049] The outer stirring tubes 10 are evenly arranged on the outside of the barrel-shaped stirring frame 9 for stirring the materials on the outside. The inward extending rod 11 is slidably arranged inside the outer stirring tubes 10 to improve the stirring effect at the center of the device. A support spring 12 is fixedly installed between one end of the outer stirring tubes 10 and the outer stirring tubes 10. The outer stirring tubes 10 are respectively embedded in the barrel-shaped stirring frame 9. The end of the outer stirring tube 10 is sealed. The inward extending rod 11 is installed on the inner end of the outer stirring tubes 10, and the extension end of the inward extending rod 11 is chamfered.

[0050] The outer stirring tube 10 is evenly embedded on the outside of the barrel-shaped stirring frame 9, which can fully stir the materials on the periphery of the device and expand the stirring range. The inward extension rod 11 is slidably set inside the outer stirring tube 10, with one end fixed by the support spring 12. It can flexibly extend and retract during the stirring process with the help of the spring elasticity. The chamfered treatment of its extension end can reduce the movement resistance and better extend to the center of the device, enhancing the stirring effect in the central area. The two work together to enable the entire stirring structure to achieve efficient stirring from the outside to the inside, improve the uniformity of raw material mixing, and ensure the quality of the preparation of high anti-yellowing and phenol yellow-resistant TPU monofilament fibers.

[0051] A highly resistant TPU monofilament fiber to yellowing and phenolic yellowing is characterized by the following preparation method: a modified hindered phenolic primary antioxidant is prepared by mixing a 1:0.8 ratio of modified hindered phenolic primary antioxidant with a phosphite secondary antioxidant and 0.5% trimethylolpropane. The modified hindered phenolic primary antioxidant, CAS number 90498-90-1, is produced by Sarex Chemicals (Shanghai) Co., Ltd.; the phosphite secondary antioxidant, CAS number 77745-66-5, is produced by Nanjing Deweiqi Chemical Technology Co., Ltd.; and the trimethylolpropane is produced by Luxi Chemical. This method utilizes the acid-base neutralization properties to prevent the formation of phenolic yellowing and simultaneously participates in the construction of the fiber molecular structure, thereby improving fiber performance.

[0052] The mixed additives are added to the polyurethane resin and mixed evenly. The extruder is then melt-spun using a screw. The main antioxidant has hydrogen atoms, which combine with the alkyl free radicals and peroxy free radicals generated in the reaction with the oxide to terminate the chain reaction. The auxiliary antioxidant reduces the alcohol with hydroperoxide, preventing it from cracking into free radicals and inhibiting yellowing. The production of phenolic yellow is prevented by introducing trimethylolpropane acid-base neutralization. After cooling in a water bath and being drawn by high-ratio radial hot water, ordered molecular chains are formed, and the microcrystalline regions are of uniform size.

[0053] This highly resistant TPU monofilament fiber exhibits remarkable effects in resisting yellowing and phenolic yellowing. Its preparation utilizes a specific ratio of modified hindered phenolic primary antioxidant, phosphite secondary antioxidant, and trimethylolpropane as a mixed additive. The primary antioxidant terminates the chain reaction by combining hydrogen atoms with free radicals, while the secondary antioxidant reduces hydroperoxides, preventing their degradation. Together, they effectively inhibit yellowing. The acid-base neutralization effect of trimethylolpropane further prevents the formation of phenolic yellow. Subsequent water cooling and high-ratio traction with hot water ensures the orderly arrangement of molecular chains and uniform microcrystalline region size, improving the fiber's mechanical properties and stability, and significantly enhancing its overall resistance to yellowing and phenolic yellowing.

[0054] The foregoing has shown and described the basic principles and main features of the present invention, as well as its advantages. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the present invention. Various changes and modifications can be made to the present invention without departing from its spirit and scope. All such changes and modifications fall within the scope of the present invention as claimed, which is defined by the appended claims and their equivalents.

Claims

1. A device for preparing high-resistance to yellowing and phenolic yellowing TPU monofilament fibers, characterized in that, include: The hybrid shell (1) has a positioning support leg (101) at its lower end and a central mounting frame (102) at its upper end, with limiting blocks evenly designed on the inner side; The central mixing chamber (2) is slidably installed in the central mounting frame (102) for uniform mixing of materials at the central axis position. A limiting groove is opened on the outside to slide with the limiting block, and an adjustment thread is designed on the outer surface. The central stirring structure (3) is located at the center of the central mixing chamber (2) to provide the power for stirring the raw materials; The height-adjusting threaded tube (4) is rotatably installed on the lower surface of the central mounting frame (102), and its inner surface is connected to the height-adjusting threaded tube by a thread. The height adjustment gear ring (5) is fixed at the upper end of the height adjustment threaded tube (4) and is used to drive the height adjustment threaded tube (4) to rotate. The height adjustment motor (6) is installed on one side of the central mounting frame (102), and its output end is fixedly fitted with a power gear that meshes with the height adjustment gear ring (5); The outer ring gear (7) is rotatably disposed on the inner side of the upper end of the mixing shell (1), and its interior is designed with a positioning mounting bracket that fits against the outer surface of the central mixing chamber (2); The drive motor (8) is fixedly installed on the outer surface of the hybrid housing (1), and its output end is fixed with a drive gear that meshes with the outer ring gear (7); A barrel-shaped mixing rack (9) is fixed to the lower surface of the positioning mounting frame, and its inner surface is in contact with the outer surface of the central mixing chamber (2); The outer stirring tubes (10) are evenly arranged on the outside of the barrel-shaped stirring frame (9) for stirring the outer materials; An inwardly extending rod (11) is slidably disposed inside the outer stirring tube (10) to improve the stirring effect at the center of the device. A support spring (12) is fixedly installed between one end of the rod and the outer stirring tube (10).

2. The equipment for preparing high-yellowing-resistant and phenol-yellowing-resistant TPU monofilament fibers according to claim 1, characterized in that, The lower end of the mixing shell (1) is designed with a centralized funnel, and an electromagnetic control valve (103) is installed at the output end of the centralized funnel. The upper side of the mixing shell (1) is designed with an outer feeding nozzle (104), and the upper end of the positioning leg (101) is fixedly welded to the centralized funnel.

3. The equipment for preparing high-yellowing-resistant and phenol-yellowing-resistant TPU monofilament fibers according to claim 2, characterized in that, The lower end of the central mixing chamber (2) is equipped with a central solenoid valve (201) for remote control. The output hole at the lower end corresponds to the center position of the central funnel. A fixed mounting plate (202) is designed inside the upper end. The central feeding nozzle (203) is set at the upper end of the central mixing chamber (2) in the opposite direction to the peripheral feeding nozzle (104).

4. The equipment for preparing high-yellowing-resistant and phenol-yellowing-resistant TPU monofilament fibers according to claim 3, characterized in that, The central stirring structure (3) includes: The stirring linear motor (301), fixed on the fixed mounting plate (202), is the power source for driving the central stirring structure (3); The triangular stirring rod (302) is uniformly welded to the output end of the stirring linear motor (301), and different directions can provide different stirring effects.

5. The equipment for preparing high-yellowing-resistant and phenol-yellowing-resistant TPU monofilament fibers according to claim 1, characterized in that, A rotation positioning groove is provided on the inner side of the upper end of the hybrid housing (1), and a power connection hole is designed on one side of the rotation positioning groove. The height adjustment gear ring (5) is rotatably installed in the rotation positioning groove, and one side of the drive gear passes through the power connection hole.

6. The equipment for preparing high-yellowing-resistant and phenol-yellowing-resistant TPU monofilament fibers according to claim 1, characterized in that, The positioning mounting bracket and the outer ring gear ring (7) are integrally molded. A stable connecting rod is provided on the inner side of the bracket and fixedly connected to the outer ring gear ring (7). An installation sleeve is designed at the other end of the stable connecting rod and fitted outside the central mixing chamber (2). The upper end of the barrel-shaped stirring bracket (9) is fixedly connected to the lower surface of the installation sleeve.

7. The equipment for preparing high-yellowing-resistant and phenol-yellowing-resistant TPU monofilament fibers according to claim 1, characterized in that, The outer stirring tubes (10) are respectively embedded on the barrel-shaped stirring frame (9), and the outer end of the device is sealed. The inward extension rod (11) is installed on the inner end of the outer stirring tube (10), and the extension end of the inward extension rod (11) is chamfered.

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