A method for manufacturing a high-loft profiled hollow fiber

Abstract

The application belongs to the technical field of modified functional fibers, and particularly relates to a manufacturing method of high-bulkiness special-shaped hollow fibers. The low-crystalline polyester chip is obtained by modifying the polyester, and the functional components such as graphite and tourmaline are introduced, and the high-bulkiness special-shaped hollow fibers are prepared by using a special-shaped spinneret to melt and spin, so that the hollow degree and bulkiness of the fibers are effectively improved, good breaking strength is obtained, and the oxygen index is effectively increased.

Description

Technical Field

[0001] This invention belongs to the field of modified polyester functional fiber technology, specifically relating to a method for manufacturing high-loft irregular hollow fibers. Background Technology

[0002] Polyester hollow fiber has evolved from its initial use as a filling material primarily for warmth and bulkiness to its widespread application in membrane separation, filling, toys, carpets, artificial fur, high-grade imitation wool fabrics, and high-grade nonwoven products, playing a vital role in the textile, apparel, medical, and wastewater treatment industries. With technological advancements and rising living standards, the development of comfortable and functional textiles has garnered increasing attention. Hollow polyester fiber, with its excellent properties of warmth, lightness, and bulkiness, provides people with high-quality functional textiles that meet their needs.

[0003] Chinese patent (publication number CN106367836B) discloses a method for manufacturing hollow biomass graphene polyester fiber. This invention involves drying biomass graphene masterbatch and polyester chips, spinning them using a shaped spinneret, and then producing hollow biomass graphene polyester fiber through a drawing process. Fabrics spun from this fiber product combine the odor-absorbing, far-infrared, antibacterial, and antistatic functions of graphene fiber with the warmth and bulkiness of hollow fiber. It exhibits good biocompatibility, contains no harmful chemicals or components, and is a non-toxic, green, and highly efficient functional textile. However, existing shaped hollow fibers still suffer from insufficient hollowness and bulkiness, and their mechanical and flame-retardant properties need improvement, hindering their further application.

[0004] Therefore, how to modify the spinning resin chips, introduce functional components, and optimize the process to prepare high-loft, irregularly shaped hollow fibers, improve the hollowness and loft of the fibers, obtain good breaking strength, and increase the oxygen index has become a key area that needs to be addressed. Summary of the Invention

[0005] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a method for manufacturing high-loft irregular hollow fibers, which aims to solve the problems of insufficient hollowness and loft of existing irregular hollow fibers, as well as the need to improve their mechanical properties and flame retardant properties.

[0006] This invention obtains low-crystallinity polyester chips by modifying polyester and introducing functional components such as graphite and tourmaline. High-bulk hollow fibers are then prepared by melt spinning using a shaped spinneret. This effectively improves the hollowness and bulkiness of the fibers, while also achieving good breaking strength and effectively increasing the oxygen index.

[0007] The technical solution of the present invention is as follows:

[0008] This invention provides a method for manufacturing high-loft irregular hollow fibers, comprising the following steps:

[0009] S1: By weight, 90-100 parts of hydroxyl-terminated polydimethylsiloxane and 4-8 parts of boric acid are mixed for pre-reaction, and then 4-6 parts of 3-aminopropyltriethoxysilane are added for coupling treatment to obtain an intermediate product; 90-100 parts of polyester elastomer and 3-9 parts of the intermediate product are melt-blended to obtain low-crystallinity polyester chips.

[0010] S2: By weight, 90-100 parts of low-crystallinity polyester chips, 6-10 parts of graphite, 2-4 parts of tourmaline and 0.2-0.6 parts of color masterbatch are mixed and then melt-spun using a shaped spinneret to obtain high-bulk shaped hollow fibers.

[0011] As a preferred embodiment of the present invention, the weight parts of the hydroxyl-terminated polydimethylsiloxane may be 90 parts, 92 parts, 94 parts, 96 parts, 98 parts, or 100 parts, etc.

[0012] As a preferred embodiment of the present invention, the boric acid may be expressed in parts by weight of 4, 5, 6, 7 or 8, etc.

[0013] As a preferred embodiment of the present invention, the weight parts of the 3-aminopropyltriethoxysilane may be 4 parts, 4.5 parts, 5 parts, 5.5 parts, or 6 parts, etc.

[0014] As a preferred embodiment of the present invention, the weight parts of the polyester elastomer may be 90 parts, 92 parts, 94 parts, 96 parts, 98 parts, or 100 parts, etc.

[0015] As a preferred embodiment of the present invention, the weight fraction of the low-crystallinity polyester chips can be 90 parts, 92 parts, 94 parts, 96 parts, 98 parts, or 100 parts, etc.

[0016] As a preferred embodiment of the present invention, the graphite may be in the following weight proportions: 6 parts, 7 parts, 8 parts, 9 parts, or 10 parts.

[0017] As a preferred embodiment of the present invention, the tourmaline may be in the following weight proportions: 2 parts, 2.5 parts, 3 parts, 3.5 parts, or 4 parts, etc.

[0018] As a preferred embodiment of the present invention, the weight parts of the masterbatch can be 0.2 parts, 0.3 parts, 0.4 parts, 0.5 parts or 0.6 parts, etc.

[0019] As a preferred embodiment of the present invention, the pre-reaction conditions include: under vacuum conditions, heating to 170~180℃ and reacting for 120~140 min, then cooling to room temperature.

[0020] As a preferred technical solution of the present invention, the coupling treatment conditions include: stirring for 20-30 minutes and then drying at 80-90°C for 4-6 hours.

[0021] As a preferred technical solution of the present invention, the conditions for melt blending include: stirring at 210~220℃ for 10~16min to obtain a blend, feeding the blend into the feeding cylinder of a strip granulator, melting and extruding the strips in stages with increasing temperature, and then water-cooling and pelletizing.

[0022] The addition of polyborosiloxane to low-crystallinity polyester chips allows its molecular chains to be incorporated into the polyester molecular chains, hindering the orderly arrangement of the hard crystalline segments and disrupting the regularity of the crystal molecular chains. This results in more crystal defects in the polyester, a decrease in the overall crystallinity of the chips, and an increase in the flexibility of the molecular chains. This is beneficial for improving melt flow and the formation of hollow structures, while also reducing fiber rigidity and enhancing the fluffy feel.

[0023] As a preferred embodiment of the present invention, the mixing conditions include: a rotation speed of 80~100 r / min and a mixing time of 10~20 min.

[0024] As a preferred technical solution of the present invention, the irregular spinneret is selected from one of the following: triangular irregular hollow spinneret, pentagonal single-hole irregular hollow spinneret, and polygonal single-hole irregular hollow spinneret.

[0025] As a preferred embodiment of the present invention, the melt spinning conditions include: a spinning temperature of 265~275℃, a spinning speed of 950~1050m / min, and a draw ratio of 3.6~4.2 times.

[0026] As a preferred embodiment of the present invention, the graphite is ionic liquid-modified graphite;

[0027] The preparation method of the ionic liquid modified graphite includes: mixing 16-24 parts of commercially available graphite and 4-6 parts of ionic liquid evenly by weight, then adding 200-300 parts of deionized water and sonicating for 30-40 minutes, and then transferring to a ball milling jar containing zirconium oxide for ball milling to obtain ionic liquid modified graphite.

[0028] As a preferred embodiment of the present invention, the conditions for ball milling include: ball milling speed of 2400~2600 r / min, ball milling time of 36~40 h, and drying.

[0029] Surface functionalization of graphite with ionic liquids can reduce agglomeration and ensure that graphite is uniformly dispersed in the fiber matrix. At the same time, ionic liquids can act as bridges to improve the interfacial compatibility between graphite and polymer matrix, help enhance the interaction between the two, form a stronger interfacial bond, and thus improve the mechanical properties of the fiber.

[0030] As a preferred embodiment of the present invention, the tourmaline is aluminate-modified tourmaline;

[0031] The preparation method of the aluminate-modified tourmaline includes: adding 20-30 parts by weight of commercially available tourmaline and 1.2-1.6 parts by weight of aluminate coupling agent to 200-300 parts by benzene for modification treatment to obtain modified tourmaline.

[0032] As a preferred technical solution of the present invention, the conditions for the modification treatment include: stirring at 60~70℃ for 30~50 min, centrifugation, drying, and grinding.

[0033] The natural porous structure of aluminate-modified tourmaline can adsorb combustible small molecules generated by pyrolysis, reducing fuel supply; the alumina generated by the pyrolysis of aluminate synergistically captures free radicals, interrupting the combustion chain reaction; at the same time, the endothermic decomposition of aluminate and the endothermic decomposition of tourmaline synergistically reduce the temperature of the combustion zone, thereby effectively improving the oxygen index.

[0034] Compared with the prior art, the present invention has the following beneficial effects:

[0035] (1) The present invention first modifies the polyester raw material by introducing polyborosiloxane to reduce the crystallinity of the chips and enhance the flexibility of the molecular chain, which is beneficial to improve the hollowness and bulkiness in the subsequent preparation of the shaped hollow fiber. At the same time, ionic liquid modified graphite and aluminate modified tourmaline and other modifying components are added. The former can form hydrogen bonds or dipole interactions with the ester groups of the polyester molecular chain through the polar groups of the ionic liquid, and the latter aluminate coupling agent forms Al-O-Si bonds by combining with the hydroxyl groups on the surface of tourmaline through the aluminum end. It is connected to the polyester molecular chain through physical entanglement or chemical bonds at the organic end, and the combined effect improves the breaking strength of the fiber.

[0036] (2) The low-crystallinity polyester chips of the present invention contain silicon and boron. Silicon pyrolysis generates silicates to form a glassy protective layer on the material surface. Boron can combine with phosphorus in ionic liquid-modified graphite to form borophosphate to improve the density of the protective layer. Ionic liquid can decompose to generate non-flammable gas to dilute the concentration of flammable gas. At the same time, thermal decomposition generates nitrogen and phosphorus free radical quenchers to interrupt the combustion chain reaction. Metal ions in tourmaline can catalyze the dehydrogenation reaction of polymers and promote the formation of a dense carbon layer. Alumina generated by the pyrolysis of esters synergistically captures free radicals and interrupts the combustion chain reaction. Through the synergistic effect of multiple components, the flame retardancy of the fiber is improved.

[0037] (3) By adding polyborosiloxane, the molecular chain of the present invention is doped into the polyester molecular chain, which hinders the orderly arrangement of the hard segment molecular chain of crystallization, destroys the regularity of the TPEE crystal molecular chain, resulting in more crystal defects in polyester, a decrease in the overall crystallinity of the chips, and enhances the flexibility of the molecular chain, which is beneficial to improving melt flow and the forming of hollow structure, while reducing fiber rigidity and improving the fluffy feel.

[0038] (4) The present invention uses ionic liquid to functionalize the surface of graphite, which can reduce agglomeration and ensure that graphite is uniformly dispersed in the fiber matrix. At the same time, ionic liquid can act as a bridge to improve the interfacial compatibility between graphite and polymer matrix, help enhance the interaction between the two, form a stronger interfacial bond, and thus improve the mechanical properties of the fiber.

[0039] (5) The natural porous structure of the aluminate-modified tourmaline of the present invention can adsorb combustible small molecules generated by pyrolysis, thereby reducing fuel supply; the alumina generated by the pyrolysis of aluminate synergistically captures free radicals and interrupts the combustion chain reaction; at the same time, the endothermic decomposition of aluminate and the endothermic decomposition of tourmaline synergistically reduce the temperature of the combustion zone, thereby effectively improving the oxygen index. Detailed Implementation

[0040] To facilitate understanding of the present invention, the following embodiments are provided. Those skilled in the art should understand that these embodiments are merely illustrative and should not be construed as limiting the scope of the invention.

[0041] The sources of some components in the examples and comparative examples are as follows:

[0042] Commercially available polyester chips were purchased from Zhejiang Hengyi Petrochemical Co., Ltd.

[0043] Commercially available graphite, item number E477901, was purchased from Shanghai Aladdin Biochemical Technology Co., Ltd.

[0044] Commercially available tourmaline, CAS No. 1317-93-7, purchased from Wuhan Jixin Yibang Biotechnology Co., Ltd.

[0045] Masterbatch, item number B2190, purchased from Guangdong Meilian New Materials Co., Ltd.

[0046] Polyester elastomer, part number 6356, purchased from DuPont, USA;

[0047] Hydroxyl-terminated polydimethylsiloxane, product number P433351, was purchased from Shanghai Aladdin Biochemical Technology Co., Ltd.

[0048] Boric acid, CAS No. 10043-35-3, was purchased from Sinopharm Chemical Reagent Co., Ltd.

[0049] 3-Aminopropyltriethoxysilane, CAS No. 919-30-2, was purchased from Shanghai Maclean Biochemical Technology Co., Ltd.

[0050] Ionic liquid, 1-butyl-3-methylimidazolium hexafluorophosphate, catalog number B107646, purchased from Shanghai Aladdin Biochemical Technology Co., Ltd.

[0051] Aluminate coupling agent, model LD-B-1, purchased from Yangzhou Lida Resin Co., Ltd.

[0052] Benzene, CAS No. 71-43-2, purchased from Sinopharm Chemical Reagent Co., Ltd. Example 1

[0053] This embodiment provides a method for manufacturing high-loft irregular hollow fibers, including the following steps:

[0054] S1: By weight, 100 parts of hydroxyl-terminated polydimethylsiloxane and 8 parts of boric acid were mixed for pre-reaction. Under vacuum, the mixture was heated to 180°C and reacted for 120 min. After cooling to room temperature, 6 parts of 3-aminopropyltriethoxysilane were added for coupling treatment. The mixture was stirred for 30 min and then dried at 90°C for 4 h to obtain an intermediate product. 100 parts of polyester elastomer and 9 parts of the intermediate product were melt-blended and stirred at 220°C for 10 min to obtain a blend. The blend was fed into the feed cylinder of a strip granulator and melt-extruded into strips by staged heating. The strips were then water-cooled and granulated to obtain low-crystallinity polyester chips.

[0055] S2: By weight, 100 parts of low-crystallinity polyester chips, 10 parts of ionic liquid modified graphite, 4 parts of aluminate modified tourmaline and 0.6 parts of color masterbatch are mixed (rotation speed is 100 r / min, time is 10 min), and then melt-spun using a triangular hollow spinneret (spinning temperature is 275℃, spinning speed is 1050 m / min, and draw ratio is 4.2 times) to obtain high-bulk hollow fibers.

[0056] Preparation of the ionic liquid modified graphite: 24 parts by weight of commercially available graphite and 6 parts by weight of ionic liquid were mixed evenly, and then 300 parts by weight of deionized water were added and ultrasonicated for 40 min. Then the mixture was transferred to a ball milling jar containing zirconium oxide for ball milling at a speed of 2600 r / min for 40 h. After drying, ionic liquid modified graphite was obtained.

[0057] Preparation of the aluminate-modified tourmaline: 30 parts by weight of commercially available tourmaline and 1.6 parts by weight of aluminate coupling agent were added to 300 parts of benzene for modification treatment. The mixture was stirred at 70°C for 30 minutes, centrifuged, dried, and ground to obtain the modified tourmaline. Example 2

[0058] This embodiment provides a method for manufacturing high-loft irregular hollow fibers, including the following steps:

[0059] S1: By weight, 90 parts of hydroxyl-terminated polydimethylsiloxane and 4 parts of boric acid were mixed and pre-reacted. Under vacuum, the mixture was heated to 170°C and reacted for 140 min. After cooling to room temperature, 4 parts of 3-aminopropyltriethoxysilane were added for coupling treatment. The mixture was stirred for 20 min and then dried at 80°C for 6 h to obtain an intermediate product. 90 parts of polyester elastomer and 3 parts of the intermediate product were melt-blended and stirred at 210°C for 16 min to obtain a blend. The blend was fed into the feed cylinder of a strip granulator and melt-extruded into strips by staged heating. The strips were then water-cooled and granulated to obtain low-crystallinity polyester chips.

[0060] S2: By weight, 90 parts of low-crystallinity polyester chips, 6 parts of ionic liquid modified graphite, 2 parts of aluminate modified tourmaline and 0.2 parts of color masterbatch were mixed (rotation speed 80 r / min, time 20 min), and then melt spun using a pentagonal single-hole shaped hollow spinneret (spinning temperature 265℃, spinning speed 950 m / min, draw ratio 3.6 times) to obtain high-bulk shaped hollow fibers.

[0061] Preparation of the ionic liquid modified graphite: 16 parts by weight of commercially available graphite and 4 parts by weight of ionic liquid are mixed evenly, and then 200 parts by weight of deionized water are added and ultrasonicated for 30 min. Then, the mixture is transferred to a ball mill jar containing zirconium oxide for ball milling at a speed of 2400 r / min for 40 h. After drying, ionic liquid modified graphite is obtained.

[0062] Preparation of the aluminate-modified tourmaline: 20 parts by weight of commercially available tourmaline and 1.2 parts by weight of aluminate coupling agent were added to 200 parts of benzene for modification treatment. The mixture was stirred at 60°C for 50 min, centrifuged, dried, and ground to obtain the modified tourmaline. Example 3

[0063] This embodiment provides a method for manufacturing high-loft irregular hollow fibers, including the following steps:

[0064] S1: By weight, 95 parts of hydroxyl-terminated polydimethylsiloxane and 6 parts of boric acid were mixed and pre-reacted. Under vacuum, the mixture was heated to 175°C and reacted for 130 min. After cooling to room temperature, 5 parts of 3-aminopropyltriethoxysilane were added for coupling treatment. The mixture was stirred for 25 min and then dried at 85°C for 5 h to obtain an intermediate product. 95 parts of polyester elastomer and 6 parts of the intermediate product were melt-blended and stirred at 215°C for 14 min to obtain a blend. The blend was fed into the feed cylinder of a strip granulator and melt-extruded into strips by staged heating. The strips were then water-cooled and granulated to obtain low-crystallinity polyester chips.

[0065] S2: By weight, 95 parts of low-crystallinity polyester chips, 8 parts of ionic liquid modified graphite, 3 parts of aluminate modified tourmaline and 0.4 parts of color masterbatch were mixed (rotation speed 90 r / min, time 15 min), and then melt spun using a multi-angled single-hole profiled hollow spinneret (spinning temperature 270℃, spinning speed 1000 m / min, draw ratio 3.8 times) to obtain high-bulk profiled hollow fiber.

[0066] Preparation of the ionic liquid modified graphite: 20 parts by weight of commercially available graphite and 5 parts by weight of ionic liquid are mixed evenly, and then 250 parts by weight of deionized water are added and ultrasonicated for 35 min. Then, the mixture is transferred to a ball milling jar containing zirconium oxide for ball milling at a speed of 2500 r / min for 38 h. After drying, ionic liquid modified graphite is obtained.

[0067] Preparation of the aluminate-modified tourmaline: 25 parts by weight of commercially available tourmaline and 1.4 parts by weight of aluminate coupling agent were added to 250 parts by weight of benzene for modification treatment. The mixture was stirred at 65°C for 40 min, centrifuged, dried, and ground to obtain the modified tourmaline. Example 4

[0068] The difference between this embodiment and Embodiment 1 is that commercially available graphite (item number E477901) is used instead of ionic liquid-modified graphite. Example 5

[0069] The difference between this embodiment and Embodiment 1 is that commercially available tourmaline (CAS No. 1317-93-7) is used instead of ionic liquid to modify graphite.

[0070] Comparative Example 1

[0071] The difference between this comparative example and Example 1 is that commercially available polyester chips (purchased from Zhejiang Hengyi Petrochemical) were used instead of low-crystallinity polyester chips.

[0072] Comparative Example 2

[0073] The difference between this comparative example and Example 1 is that 10 parts of ionic liquid-modified graphite are not added in step S2.

[0074] Comparative Example 3

[0075] The difference between this comparative example and Example 1 is that 4 parts of aluminate-modified tourmaline are not added in step S2.

[0076] The performance of the above embodiments and comparative examples was tested using the following methods: (1) Hollowness was tested according to the requirements of "FZ / T50002-2013 Test Method for Deformity of Chemical Fibers"; (2) Tensile strength was tested according to the requirements of "GB / T 14344-2022 Test Method for Tensile Properties of Chemical Fiber Filaments"; and oxygen index was tested according to the requirements of "GB / T 5454-1997 Test Method for Burning Performance of Textiles - Oxygen Index Method".

[0077] The performance test data above are shown in Table 1.

[0078] Table 1 Performance Test Results

[0079]

[0080] As can be seen from the above, the present invention obtains low-crystallinity polyester chips by modifying polyester, and introduces functional components such as graphite and tourmaline, and prepares high-bulk profiled hollow fibers (Examples 1 to 3) by melt spinning using profiled spinnerets. These fibers have the best comprehensive performance, with a hollowness of 23.1 to 23.8%, a breaking strength of 4.27 to 4.32 cN / detx, and an oxygen index of 35.9 to 36.4%.

[0081] Compared to Example 1, replacing ionic liquid-modified graphite with commercially available graphite (item number E477901) resulted in decreased tensile strength and deteriorated flame retardant performance (Example 4); compared to Example 1, replacing ionic liquid-modified graphite with commercially available tourmaline (CAS number 1317-93-7) resulted in decreased tensile strength and deteriorated flame retardant performance (Example 5); compared to Example 1, replacing low-crystallinity polyester chips with commercially available polyester chips (purchased from Zhejiang Hengyi Petrochemical) resulted in reduced hollowness, decreased tensile strength, and deteriorated flame retardant performance (Comparative Example 1); compared to Example 1, not adding 10 parts of ionic liquid-modified graphite in step S2 resulted in decreased tensile strength and deteriorated flame retardant performance (Comparative Example 2); compared to Example 1, not adding 4 parts of aluminate-modified tourmaline in step S2 resulted in decreased tensile strength and deteriorated flame retardant performance (Comparative Example 3).

[0082] In summary, this invention obtains low-crystallinity polyester chips by modifying polyester and introducing functional components such as graphite and tourmaline. High-bulk hollow fibers are then prepared by melt spinning using a shaped spinneret. This effectively improves the hollowness and bulkiness of the fibers, while also achieving good breaking strength and effectively increasing the oxygen index.

Claims

1. A method for manufacturing high-loft irregular hollow fibers, characterized in that, Includes the following steps: S1: By weight, 90-100 parts of hydroxyl-terminated polydimethylsiloxane and 4-8 parts of boric acid are mixed for pre-reaction, and then 4-6 parts of 3-aminopropyltriethoxysilane are added for coupling treatment to obtain an intermediate product; 90-100 parts of polyester elastomer and 3-9 parts of the intermediate product are melt-blended to obtain low-crystallinity polyester chips. S2: By weight, 90-100 parts of low-crystallinity polyester chips, 6-10 parts of ionic liquid modified graphite, 2-4 parts of aluminate modified tourmaline and 0.2-0.6 parts of color masterbatch are mixed and then melt-spun using a shaped spinneret to obtain high-loft shaped hollow fibers. The preparation method of the ionic liquid modified graphite includes: mixing 16-24 parts of commercially available graphite and 4-6 parts of ionic liquid evenly by weight, then adding 200-300 parts of deionized water and sonicating for 30-40 minutes, and then transferring it to a ball milling jar containing zirconium oxide for ball milling to obtain ionic liquid modified graphite. The preparation method of the aluminate-modified tourmaline includes: adding 20-30 parts by weight of commercially available tourmaline and 1.2-1.6 parts by weight of aluminate coupling agent to 200-300 parts by benzene for modification treatment to obtain modified tourmaline.

2. The method for manufacturing a high-loft, irregularly shaped hollow fiber according to claim 1, characterized in that, The pre-reaction conditions include: under vacuum conditions, heating to 170~180℃ and reacting for 120~140 min, then cooling to room temperature.

3. The method for manufacturing a high-loft, irregularly shaped hollow fiber according to claim 1, characterized in that, The coupling treatment conditions include: stirring for 20-30 minutes, and then drying at 80-90°C for 4-6 hours.

4. The method for manufacturing a high-loft, irregularly shaped hollow fiber according to claim 1, characterized in that, The conditions for melt blending include: stirring at 210~220℃ for 10~16 minutes to obtain a blend, feeding the blend into the feed cylinder of a strip granulator, melting and extruding the blend in stages, and then water-cooling and pelletizing.

5. The method for manufacturing a high-loft, irregularly shaped hollow fiber according to claim 1, characterized in that, The irregularly shaped spinneret is selected from one of the following: triangular irregularly shaped hollow spinneret, pentagonal single-hole irregularly shaped hollow spinneret, and polygonal single-hole irregularly shaped hollow spinneret.

6. The method for manufacturing a high-loft, irregularly shaped hollow fiber according to claim 1, characterized in that, The conditions for melt spinning include: a spinning temperature of 265~275℃, a spinning speed of 950~1050m / min, and a draw ratio of 3.6~4.

2.

7. The method for manufacturing a high-loft, irregularly shaped hollow fiber according to claim 1, characterized in that, The conditions for ball milling include: ball milling speed of 2400~2600 r / min, ball milling time of 36~40 h, and drying.

8. The method for manufacturing a high-loft, irregularly shaped hollow fiber according to claim 1, characterized in that, The modification treatment conditions include: stirring at 60~70℃ for 30~50 min, centrifugation, drying, and grinding.

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