A method for preparing polyester-nylon composite filament ultrafine fiber

Abstract

The present invention relates to the field of textile processing technology, and in particular to a method for preparing polyester-nylon composite filament ultrafine fibers. Aiming at the deficiencies of the prior art, a cooling space is formed around a spinneret by arranging a self-rotating ventilation pipe, the ventilation pipe faces one side of the cooling space, and a suction zone for extracting hot air is formed by a high-speed airflow, so that the hot air formed by spinning in the cooling space is extracted and cooled, and at the same time, waste silk impurities are guided to move closer to a passing tube, and then the waste silk impurities are removed by friction and scraping between two groups of ventilation pipes and discharged outwardly in an exhaust zone. The whole process is simple and compact, and the cleaning effect is better.

Description

Technical Field

[0001] The invention relates to the technical field of textile processing, and in particular to a method for preparing polyester-nylon composite filament ultrafine fibers. Background Art

[0002] Polyester-nylon composite fiber is formed by mixing polyester melt and nylon melt, and then jet spinning and cooling. In the process of polyester-nylon fiber composite, the polyester melt and the nylon melt need to be fed into the same spinning component, and then stirred and mixed evenly, and finally ejected from the same spinning hole to form a composite fiber. In the process of melt jetting to form the composite fiber, hot air will be generated when the mixed melt is ejected from the spinneret to form. During the cooling and forming process of the mixed melt, the mixed melt entrained by the hot air will adhere to the fence plate outside the spinneret. If it is not cleaned, it will affect the spinning, such as dripping onto the silk thread and attaching to it, causing the silk thread to be rough, and also causing a waste of the mixed melt. It often needs to be stopped for cleaning. Once large-scale spinning equipment is stopped for cleaning, the spinneret holes in the spinneret will be blocked, which is difficult to clean.

[0003] In the Chinese patent application number CN202010760787.7 previously applied by the applicant, a high-quality nylon filament production equipment and its process are specifically disclosed. The equipment includes a melt extruder, and also includes: a spinneret, which is connected to the melt extruder through a pipeline, and the spinneret includes a die head, a spinneret, a fence unit, a cleaning component and an air suction component. The fence unit is sleeved on the outside of the die head, the cleaning component is arranged on the fence unit, and the air suction component is arranged on the side below the fence unit; a forming device, the forming device pulls and shapes the silk thread sprayed from the spinneret; a winding device, which automatically winds up the silk thread pulled and shaped by the forming device; the process includes a melt extrusion process, a spinneret process, a cleaning process, a pulling and shaping process, and an automatic winding process. The cleaning component on the spinneret automatically and regularly cleans the spinning raw materials adhered to the fence plate outside the spinneret, so that the spinning raw materials adhered to the fence plate can be cleaned in time to prevent them from dripping and adhering to the silk thread, thereby improving the quality of the silk thread.

[0004] However, according to the applicant, the above-mentioned production equipment and process plan are too complicated in actual operation, and it is difficult to achieve stability and consistency during the flipping of the fence panels, resulting in poor cleaning effect. Summary of the invention

[0005] In view of the above problems, the present invention provides a method for preparing polyester-nylon composite filament ultrafine fibers. In view of the shortcomings of the prior art, a cooling space is formed around the spinneret by setting a self-rotating ventilation pipe. The ventilation pipe is opposite to one side of the cooling space, and a suction area for extracting hot air is formed by high-speed airflow. The hot air formed by spindle spinning in the cooling space is extracted and cooled, and at the same time, waste silk impurities are guided to move closer to the passing tube. Thereafter, the waste silk impurities are removed by friction and scraping between the two groups of ventilation pipes and discharged outwardly in the exhaust area. The whole process is simple and compact, and the cleaning effect is better.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A method for preparing polyester-nylon composite filament ultrafine fiber comprises the following steps:

[0008] Step 1, preparing a mixture A, copolymerizing terephthalic acid and ethylene glycol to obtain polyethylene terephthalate slices, drying the polyethylene terephthalate slices and sodium dimethyl sulfonate isophthalate, and then mixing them evenly to obtain a mixture A;

[0009] Step 2, preparing a mixture B, drying the polyamide slices, silicon dioxide and calcium oxide and mixing them uniformly to obtain a mixture B;

[0010] Step 3, preparing melt A and melt B, adding mixture A and mixture B into a screw extruder respectively for melt extrusion to obtain melt A and melt B;

[0011] Step 4, spinning, melt A and melt B are combined and transported to the spinning box, and are sprayed out through the spinneret holes to form filaments, that is, composite fibers are obtained. The composite fibers pass through the cooling space surrounded by the cooling unit below the spinneret to be cooled and shaped;

[0012] Step 5, cleaning of residual silk. Synchronously with step 4, while the cooling unit maintains the cooling space to perform cooling work stably, the ventilation pipe on the cooling unit used to surround the cooling space is rotated around its own central axis, so that the residual silk impurities adhered to the ventilation pipe are cleaned by the friction between the adjacent ventilation pipes. A partition is arranged inside the ventilation pipe, which divides the ventilation pipe into a suction area and an exhaust area. The suction area is arranged toward the cooling space, and the suction area extracts the gas in the cooling space and discharges it outward through the exhaust area, so that the residual silk impurities are concentratedly taken away;

[0013] Step 6: Traction, oiling and winding. After the composite fiber has been cooled and shaped, it is pulled by a traction roller for oiling and then wound by a winding roller.

[0014] As an improvement, terephthalic acid, ethylene glycol and sodium dimethyl sulfonate isophthalate are respectively 30-50 parts, 50-70 parts and 5-10 parts by weight;

[0015] The polyamide slices, silicon dioxide and calcium oxide are respectively 45-60 parts, 10-15 parts and 5-6 parts by weight.

[0016] As an improvement, a plurality of guide vanes are provided on both sides of the partition, both ends of the guide vanes are connected to the partition, and a guide gap is provided between the middle of the guide vanes and the partition.

[0017] As an improvement, a plurality of air holes are evenly distributed on the wall of the ventilation pipe.

[0018] As an improvement, the bottom of the air suction zone is provided with a connected air supply chamber for supplying high-speed airflow, and the bottom of the air exhaust zone is sealed.

[0019] As an improvement, the partition includes a fixed plate and a movable cutter;

[0020] The fixing plate is integrally connected with the guide blade;

[0021] The movable cutter is inserted between the guide blades facing the fixed plate, and a knife slit for the movable cutter to extend out is provided on the pipe wall of the ventilation pipe.

[0022] As an improvement, the movable cutter includes a blade, an elastic strip and a fixed strip;

[0023] The blade is slidably arranged, the fixing strip is fixedly arranged, and the elastic strip is located between the blade and the fixing strip.

[0024] As an improvement, in two adjacent groups of ventilation pipes, when the ventilation pipes in any one group rotate, the ventilation pipes in the other group remain stationary, and the movable cutter extends from the stationary ventilation pipe to scrape and clean the rotating ventilation pipe.

[0025] As an improvement, a rotating shaft is provided at the central axis of the ventilating pipe, a driven gear is sleeved at the bottom of the rotating shaft, a gear ring is sleeved on the outer ring of the driven gear, a toothed portion and a toothless portion are arranged at intervals between the inner ring of the gear ring and the driven gear, and when the toothed portion cooperates with the driven gear, the ventilating pipe is driven to rotate 180°, and when the toothless portion cooperates with the driven gear, the corresponding ventilating pipe is stationary;

[0026] The gear ring is arranged to rotate by cooperating with a driving gear driven to rotate by a motor.

[0027] As an improvement, the spinneret includes a spinneret plate and several groups of distribution plates;

[0028] The spinneret is provided with spinneret holes;

[0029] The distribution plates are overlapped with each other and overlap with the spinneret. Dispersing holes for dispersing and mixing melt A and melt B are provided on the distribution plates.

[0030] The beneficial effects of the present invention are:

[0031] (1) The present invention forms a cooling space around the spinneret by using a self-rotating ventilation pipe. The ventilation pipe is directly opposite to one side of the cooling space, and a suction area for extracting hot air is formed by a high-speed airflow. The hot air generated by spinning in the cooling space is extracted and cooled, and at the same time, waste silk impurities are guided to move closer to the passing pipe. Then, the waste silk impurities are removed by friction and scraping between the two groups of ventilation pipes and discharged outward in the exhaust area. The whole process is simple and compact, and the cleaning effect is better.

[0032] (2) The high-speed airflow of the present invention flows in the ventilation pipe from bottom to top in the suction area. The guide vanes are arranged so that the air holes in the suction area take away the hot air in the cooling space. When the airflow flows to the exhaust area, the airflow flows from top to bottom and is discharged through the air holes by the cooperation of the guide vanes, which is conducive to the centralized discharge of waste silk impurities.

[0033] (3) As the high-speed airflow flows upward, the suction capacity of the suction zone of the present invention gradually weakens from bottom to top, so that the mixed melt just ejected from the spinneret will not be affected by the suction zone, while the cooling and forming of the composite fiber can be well ensured;

[0034] (4) When the ventilation pipe is provided, the waste wire impurities adhering to the ventilation pipe can be removed by direct rotational friction of the two groups of ventilation pipes, and the surface of the rotating ventilation pipe can be scraped by a movable cutter provided inside the ventilation pipe, thereby ensuring the normal and continuous use of the ventilation pipe;

[0035] (5) In the present invention, when two adjacent groups of ventilation pipes are rotating, the ventilation pipes of the other group are positioned by the movable cutter and will not rotate due to friction. The movable cutter continuously scrapes the rotating ventilation pipes to remove the adhering waste silk impurities. At the same time, the waste silk impurities are driven by the rotating ventilation pipes to transfer to one side of the exhaust area and are taken away by the air flow.

[0036] In summary, the present invention has the advantages of strong cleaning ability, superior and stable composite fiber performance, simple cleaning, etc., and is particularly suitable for the technical field of preparation of polyester-nylon composite filament ultrafine fibers. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a schematic diagram of the preparation method of the present invention;

[0038] Figure 2 It is a schematic diagram of the three-dimensional structure of the spinning device of the present invention;

[0039] Figure 3 It is a schematic diagram of the three-dimensional structure of the cooling unit of the present invention;

[0040] Figure 4 This is a schematic diagram of the fracture structure of the cooling unit of the present invention;

[0041] Figure 5 It is a schematic diagram of the three-dimensional structure of the base of the present invention;

[0042] Figure 6 for Figure 5 A schematic diagram of the structure enlargement in the middle;

[0043] Figure 7 It is a schematic diagram of the installation structure of the base and the ventilation pipe of the present invention;

[0044] Figure 8 for Figure 6 A magnified schematic diagram of the structure at B in the middle;

[0045] Fig. 9 It is a schematic diagram of the three-dimensional structure of the ventilation pipe of the present invention;

[0046] Fig.10 It is a schematic diagram of the cross-sectional structure of the ventilation pipe of the present invention;

[0047] Fig.11 This is a schematic diagram of the structure in which the ventilation pipe of the present invention is separated by a partition;

[0048] Fig.12 It is a schematic diagram of the three-dimensional structure of the partition of the present invention;

[0049] Fig.13 It is a schematic diagram of the three-dimensional structure of the guide vane of the present invention;

[0050] Fig.14 This is a schematic diagram of the structure of the movable blade in a top view of the present invention;

[0051] Fig.15 This is a schematic diagram of the bottom structure of the cooling unit of the present invention;

[0052] Fig.16 It is a schematic diagram of the three-dimensional structure of the spinneret of the present invention;

[0053] Fig.17 This is a schematic diagram of the three-dimensional structure of the distribution plate of the present invention;

[0054] Fig.18 It is a schematic diagram of the three-dimensional structure of the spinneret of the present invention. DETAILED DESCRIPTION

[0055] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0056] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0057] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0058] Embodiment 1:

[0059] like Figure 1 As shown, a method for preparing polyester-nylon composite filament ultrafine fiber comprises the following steps:

[0060] Step 1, preparing a mixture A, copolymerizing terephthalic acid and ethylene glycol to obtain polyethylene terephthalate slices, drying the polyethylene terephthalate slices and sodium dimethyl sulfonate isophthalate, and then mixing them evenly to obtain a mixture A;

[0061] Step 2, preparing a mixture B, drying the polyamide slices, silicon dioxide and calcium oxide and mixing them uniformly to obtain a mixture B;

[0062] Step 3, preparing melt A and melt B, adding mixture A and mixture B into a screw extruder respectively for melt extrusion to obtain melt A and melt B;

[0063] Step 4: Spinning: melt A and melt B are combined and transported to the spinning box, and are ejected through the spinneret holes on the spinneret 1 to form filaments, thus obtaining composite fibers. The composite fibers pass through the cooling space 21 surrounded by the cooling unit 2 below the spinneret 1 for cooling and shaping;

[0064] Step 5, cleaning of residual silk. Synchronously with step 4, while the cooling unit 2 maintains the cooling space 21 to perform a stable cooling operation, the ventilation pipe 22 on the cooling unit 2 used to surround the cooling space 21 is rotated around its own central axis, so that the residual silk impurities adhered to the ventilation pipe 22 are cleaned by the friction between the adjacent ventilation pipes 22. A partition 221 is provided inside the ventilation pipe 22, and the partition 221 divides the ventilation pipe 22 into a suction area 222 and an exhaust area 223. The suction area 222 is arranged toward the cooling space 21. The suction area 222 extracts the gas in the cooling space 21 and discharges it outward through the exhaust area 223, so that the residual silk impurities are concentratedly taken away;

[0065] Step 6: Traction, oiling and winding. After the composite fiber has been cooled and shaped, it is pulled by a traction roller for oiling and then wound by a winding roller.

[0066] Wherein, terephthalic acid, ethylene glycol and sodium dimethyl sulfonate isophthalate are respectively 30-50 parts, 50-70 parts and 5-10 parts by weight;

[0067] The polyamide slices, silicon dioxide and calcium oxide are respectively 45-60 parts, 10-15 parts and 5-6 parts by weight.

[0068] It should be noted that the difference between the present application and the comparative documents in the background technology is that the present application does not have a fence plate, and during the entire cleaning process, there is no additional cleaning component. Cleaning is completely dependent on the friction and scraping cooperation between the ventilation pipes. After the waste wire impurities are rubbed against the glass, they are sucked into the air holes and then sprayed out in the exhaust area to complete the cleaning. They can also be bitten into the exhaust area through the friction between the ventilation pipes and enter the exhaust area through the gaps between the ventilation pipes. The entire cleaning process is very simple and efficient.

[0069] It is further explained that on one side of the suction area on the ventilation pipe of the present application, gas circulates from bottom to top, and the suction is greater in the area closer to the lower part, while in the upper part facing the spinneret where the composite fiber is ejected, the suction gradually weakens, thereby minimizing the influence of suction on the cooling and forming of the composite fiber.

[0070] Embodiment 2:

[0071] like Figure 2-14 As shown, the differences of Embodiment 2 of the present invention are described with reference to Embodiment 1:

[0072] The lower part of the ventilation pipe 21 is sleeved on the boss 411 protruding from the base 41, and the rotating shaft 228 on the ventilation pipe 21 passes through the boss 411. The boss 411 is provided with a slot 412 for installing the partition 221. The slot 412 is used to fix the fixing plate 2211 and the fixing strip 2215, and the blade 2213 can slide through the slot 412.

[0073] The upper part of the ventilation pipe 21 is matched with the top plate 42 and the round top of the ventilation pipe 21. The top plate 42 and the base 41 are connected and fixed by a connecting rod 421. An air guide hood 43 is arranged on the outside of the ventilation pipe 21 to collect the gas discharged from the ventilation pipe 21.

[0074] In addition, a plurality of guide blades 224 are provided on both sides of the partition 221, and the two ends of the guide blades 224 are connected to the partition 221, and a guide gap 225 is provided in the middle of the guide blades 224 and the partition 221, and a plurality of air holes 220 are evenly distributed on the tube wall of the ventilation pipe 22, and a connected air supply chamber 226 for supplying high-speed airflow is provided at the bottom of the suction area 222, and the bottom of the exhaust area 223 is sealed, and the high-speed airflow flowing in the suction area 222 will be guided and accelerated upward when passing through the guide blades 224, and on the side of the exhaust area 223, the airflow is guided by the guide blades 224 and continuously discharged outward through the air holes 220, just completing a flow cycle, which can not only cool down the cooling space 21, but also adsorb and concentrate the waste silk impurities for cleaning.

[0075] Furthermore, the partition 221 includes a fixed plate 2211 and a movable cutter 2212;

[0076] The fixing plate 2211 is integrally connected with the guide blade 224;

[0077] The movable cutter 2212 is inserted between the guide blades 224 facing the fixed plate 2211 , and a slit 227 for the movable cutter 2212 to extend out is formed on the wall of the ventilation pipe 22 .

[0078] Furthermore, the movable cutter 2212 includes a blade 2213, an elastic strip 2214 and a fixed strip 2215;

[0079] The blade 2213 is slidably arranged, the fixing strip 2215 is fixedly arranged, and the elastic strip 2214 is located between the blade 2213 and the fixing strip 2215 .

[0080] During operation, when the ventilation pipes 22 of any one group of the two adjacent groups rotate, the ventilation pipes 22 of the other group remain stationary, and the movable cutter 2212 extends from the stationary ventilation pipe 22 to scrape and clean the rotating ventilation pipe 22. Due to the setting of the elastic strip 2214, once the movable cutter 2212 is strongly squeezed, it will shrink into the ventilation pipe 22. Therefore, the two side arms of the knife gap 227 are both chamfered slopes, so that when the ventilation pipe 22 rotates, the movable blade 2222 can be smoothly retracted into the inside of the ventilation pipe 22.

[0081] Embodiment 3:

[0082] like Figure 7-9 , Fig.15 As shown, the differences of Embodiment 3 of the present invention are described with reference to Embodiment 1:

[0083] A rotating shaft 228 is provided at the central axis of the vent pipe 22. The rotating shaft 228 just passes through the partition and cooperates with the partition. A driven gear 31 is sleeved on the bottom of the rotating shaft 228. A toothed ring 32 is sleeved on the outer ring of the driven gear 31. The toothed ring 32 and the inner ring of the driven gear 31 are spaced apart to form a toothed portion 321 and a toothless portion 322. When the toothed portion 321 cooperates with the driven gear 31, the vent pipe 22 is driven to rotate 180°. When the toothless portion 322 cooperates with the driven gear 31, the corresponding vent pipe 22 is stationary.

[0084] The gear ring 32 is rotated by cooperating with a driving gear 34 driven to rotate by a motor 33 .

[0085] The tooth portion 321 cooperates with the driven gear 31 on a group of ventilation pipes 22, and the ventilation pipe 22 rotates. The number of teeth on the tooth portion 321 is exactly half of the number of teeth of the driven gear 31. The ventilation pipe 22 just rotates 180 degrees, completing the switching of the suction area and the exhaust area. For example, residual silk impurities adsorbed on the air holes are just sprayed out by the air flow. At this time, the two groups of ventilation pipes 22 adjacent to the ventilation pipe 22 just cooperate with the toothless portion 322 and do not rotate. The movable cutter 2212 extending from one group of ventilation pipes 22 just scrapes impurities from the rotating ventilation pipe 22.

[0086] It should be emphasized here that slits 227 are provided on both sides of the ventilation pipe 22. No matter how the ventilation pipe 22 is rotated 180°, the movable cutter 2212 can extend from the slit 227 on the corresponding side. It should be noted that the blade of the movable cutter 2212 only extends a little bit from the slit 227. When the ventilation pipe 22 rotates, the slit 227 will squeeze the blade of the movable cutter 2212, causing the movable cutter 2212 to shrink.

[0087] Embodiment 4:

[0088] like Figure 16-18 As shown, the differences of Example 4 of the present invention are described with reference to Example 1:

[0089] The spinneret 1 comprises a spinneret plate 11 and a plurality of distribution plates 12;

[0090] The spinneret 11 is provided with a spinneret hole 111;

[0091] The distribution plate 12 is overlapped with the spinneret, and a dispersing hole 121 for dispersing and mixing the melt A and the melt B is provided on the distribution plate 12 .

[0092] It should be noted that the distribution plate 12 is arranged in a conformal manner to the spinneret 11, and the dispersion holes 121 opened on the distribution plate 12 completely cover the spinneret holes 111 on the spinneret 11. When the distribution plate 12 approaches the spinneret 11, the dispersion holes 121 on the distribution plate 12 gradually become smaller, so that the distribution plate 12 can gradually disperse and mix the mixed melt.

[0093] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for preparing polyester-nylon composite filament ultrafine fiber, characterized in that: The following steps are involved: Step 1, preparing a mixture A, copolymerizing terephthalic acid and ethylene glycol to obtain polyethylene terephthalate slices, drying the polyethylene terephthalate slices and sodium dimethyl sulfonate isophthalate, and then mixing them evenly to obtain a mixture A; Step 2, preparing a mixture B, drying the polyamide slices, silicon dioxide and calcium oxide and mixing them uniformly to obtain a mixture B; Step 3, preparing melt A and melt B, adding mixture A and mixture B into a screw extruder respectively for melt extrusion to obtain melt A and melt B; Step 4, spinning, melt A and melt B are combined and transported to the spinning box, and are ejected through the spinneret holes on the spinneret (1) to form filaments, thus obtaining composite fibers. The composite fibers pass through a cooling space (21) surrounded by a cooling unit (2) below the spinneret (1) to be cooled and shaped; Step 5, cleaning of residual silk. Synchronously with step 4, while the cooling unit (2) maintains the cooling space (21) to perform a stable cooling operation, the ventilation pipe (22) on the cooling unit (2) used to surround the cooling space (21) is rotated around its own central axis, so that residual silk impurities adhered to the ventilation pipe (22) are cleaned by the friction between adjacent ventilation pipes (22). A partition (221) is arranged inside the ventilation pipe (22). The partition (221) divides the ventilation pipe (22) into a suction area (222) and an exhaust area (223). The suction area (222) is arranged toward the cooling space (21). The suction area (222) extracts gas in the cooling space (21) and discharges it to the outside through the exhaust area (223), thereby centrally taking away the residual silk impurities. A plurality of guide blades (224) are arranged on both sides of the partition (221). The bottom of the wind zone (222) is provided with a connected air supply chamber (226) for supplying high-speed airflow; the bottom of the exhaust zone (223) is sealed; the partition plate (221) comprises a fixed plate (2211) and a movable cutter (2212); the fixed plate (2211) and the guide blade (224) are integrally connected; the movable cutter (2212) is inserted into the guide blade (224) facing the fixed plate (2211). A knife slit (227) for the movable cutter (2212) to extend out is provided on the wall of the ventilation pipe (22), the movable cutter (2212) comprising a blade (2213), an elastic strip (2214) and a fixed strip (2215), the blade (2213) being slidably arranged, the fixed strip (2215) being fixedly arranged, and the elastic strip (2214) being located between the blade (2213) and the fixed strip (2215); Step 6: Traction, oiling and winding. After the composite fiber has been cooled and shaped, it is pulled by a traction roller for oiling and then wound by a winding roller.

2. The method for preparing a polyester-nylon composite filament ultrafine fiber according to claim 1, characterized in that: Terephthalic acid, ethylene glycol and sodium dimethyl sulfonate isophthalate are respectively 30-50 parts, 50-70 parts and 5-10 parts by weight; The polyamide slices, silicon dioxide and calcium oxide are respectively 45-60 parts, 10-15 parts and 5-6 parts by weight.

3. The method for preparing a polyester-nylon composite filament ultrafine fiber according to claim 1, characterized in that: Both ends of the guide blade (224) are connected to the partition plate (221), and a guide gap (225) is provided between the middle of the guide blade (224) and the partition plate (221).

4. The method for preparing a polyester-nylon composite filament ultrafine fiber according to claim 1, characterized in that: A plurality of air holes (220) are evenly distributed on the wall of the ventilation pipe (22).

5. The method for preparing a polyester-nylon composite filament ultrafine fiber according to claim 1, characterized in that: When the ventilation pipes (22) in any one group of the two adjacent groups rotate, the ventilation pipes (22) in the other group remain stationary, and the movable cutter (2212) extends from the stationary ventilation pipes (22) to scrape and clean the rotating ventilation pipes (22).

6. The method for preparing a polyester-nylon composite filament ultrafine fiber according to claim 1, characterized in that: A rotating shaft (228) is arranged at the central axis of the ventilation pipe (22), a driven gear (31) is sleeved on the bottom of the rotating shaft (228), a toothed ring (32) is sleeved on the outer ring of the driven gear (31), and a toothed portion (321) and a toothless portion (322) are arranged at intervals between the toothed ring (32) and the inner ring of the driven gear (31), when the toothed portion (321) is in cooperation with the driven gear (31), the ventilation pipe (22) is driven to rotate 180°, and when the toothless portion (322) is in cooperation with the driven gear (31), the corresponding ventilation pipe (22) is stationary; The gear ring (32) is arranged to rotate by cooperating with a driving gear (34) driven to rotate by a motor (33).

7. The method for preparing a polyester-nylon composite filament ultrafine fiber according to claim 1, characterized in that: The spinneret (1) comprises a spinneret plate (11) and a plurality of groups of distribution plates (12); The spinneret (11) is provided with a spinneret hole (111); The distribution plate (12) is arranged to overlap with the spinneret, and the distribution plate (12) is provided with dispersion holes (121) for dispersing and mixing melt A and melt B.

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