High-elasticity fabric and preparation method thereof

Abstract

The invention relates to a high-elasticity fabric and a preparation method thereof, and belongs to the technical field of fabric manufacturing. The high-elasticity fabric comprises composite fibers interwoven into the high-elasticity fabric, and each composite fiber comprises a core fiber, a reinforcing layer wrapping the outer surface of the core fiber and a comfortable outer layer wrapping the outer surface of the reinforcing layer; the core fiber, the reinforcing layer and the comfortable outer layer are respectively prepared into the composite fiber by a first spinning material, a second spinning material and a third spinning material through a coaxial electrostatic spinning process; a first spinning material for forming the core fiber comprises a mixture of PTT (polytrimethylene terephthalate) and graphene; a second spinning material for forming the reinforcing layer comprises a mixture of bio-based PET and nano silicon dioxide; a third spinning material for forming the comfortable outer layer comprises a mixture of copolymerization modified PET and nano ATO. In the fabric, the core fiber provides excellent elasticity; the reinforcing layer provides structural strength and durability; and the comfortable outer layer provides a skin-friendly touch sense and an intelligent heat and humidity management function.

Description

Technical Field

[0001] This invention belongs to the technical field of fabric manufacturing, and more specifically, relates to a high-elasticity fabric and its preparation method. Background Technology

[0002] As consumers increasingly demand higher performance from clothing, fabrics that combine excellent elasticity and wearing comfort have become a hot topic in market research and development.

[0003] Traditional elastic fabrics mainly rely on spandex fibers. Although spandex has excellent elasticity, it has many inherent defects, such as poor comfort in damp heat, insufficient breathability, easy aging and yellowing under the influence of light, heat, chlorine, etc., and poor bonding strength with mainstream substrates such as polyester, which limits its application in high-end functional clothing.

[0004] As an alternative, polypropylene terephthalate (PTT) fiber exhibits good "shape memory" elasticity and a soft feel due to its unique molecular structure. However, studies have shown that pure PTT fiber still has room for improvement in elastic recovery speed and long-term stability under high-intensity or frequent stretching conditions, especially when facing the demanding requirements of professional sports.

[0005] Polyester (polyethylene terephthalate, PET) is an important type of synthetic fiber. Due to its excellent mechanical properties, heat resistance and chemical stability, it is widely used in textile and industrial fields and is one of the most widely used synthetic fiber materials in the textile industry.

[0006] However, traditional polyester fibers also have defects such as poor elasticity, poor moisture absorption, poor breathability, easy pilling, poor dyeing performance, and easy static electricity generation, which make it difficult to meet the requirements of modern textiles for high elasticity, comfort and functionality, thus limiting their further application.

[0007] Therefore, developing a high-performance modified polyester fiber that combines high elasticity, high durability, and excellent comfort, especially one that can maintain stable performance under high temperature and high pressure conditions and conforms to the concept of green environmental protection, is of great theoretical significance and practical application value for promoting technological progress in the textile materials industry. Summary of the Invention

[0008] The purpose of this invention is to provide a high-elasticity fabric and its preparation method to solve the problems of poor elasticity, low strength, insufficient comfort, and poor stability under high temperature and pressure of polyester fibers in the prior art.

[0009] The objective of this invention can be achieved through the following technical solutions: A high-elasticity fabric includes composite fibers interwoven into the high-elasticity fabric, the composite fibers including a core fiber, a reinforcing layer wrapped around the outer surface of the core fiber, and a comfort outer layer wrapped around the outer surface of the reinforcing layer; The core fiber, reinforcing layer, and comfort outer layer are respectively made of the first spinning material, the second spinning material, and the third spinning material through a coaxial electrospinning process to form the composite fiber; The first spinning material forming the core fiber includes a mixture of PTT and graphene; The second spinning material forming the reinforcing layer comprises a mixture of bio-based PET and nano-silica; The third spinning material forming the comfortable outer layer includes a mixture of copolymerized modified PET and nano-ATO.

[0010] In the core fiber of this technical solution, the inherent elasticity of PTT (polypropylene terephthalate) and the physical cross-linking network formed by graphene nanosheets work synergistically to greatly enhance the fiber's creep resistance and elastic recovery rate, enabling it to quickly return to its original shape after being stretched significantly.

[0011] In the reinforcing layer, it acts as a bridge connecting the core layer and the outer layer, providing structural support for the entire fiber. Bio-based PET (polyethylene terephthalate) offers excellent chemical compatibility with the outer layer, ensuring interlayer bonding. The introduced nano-silica particles, with their extremely high hardness, chemical stability, and large specific surface area, are uniformly dispersed in the PET matrix, acting like "aggregate" in reinforced concrete. This effectively prevents the propagation of microcracks, thereby significantly improving the overall rigidity, abrasion resistance, and tear strength of the composite material.

[0012] In the comfortable outer layer, copolymerized modified PET (polyethylene terephthalate) ensures the fabric's outer layer has excellent skin-friendliness, softness, drape, and good dyeing properties. Nano-ATO (antimony-doped tin dioxide) is a highly efficient n-type semiconductor material that can effectively absorb and emit infrared rays of specific wavelengths. This reduces heat loss from the body in cold weather and promotes heat radiation in hot weather, helping the body dissipate heat and achieving passive thermoregulation that keeps the body warm in winter and cool in summer. This enhances all-weather wearing comfort and also improves the fabric's antistatic properties.

[0013] Furthermore, the bio-based PET is PET containing 30% bio-based components.

[0014] Specifically, the bio-based material is a polyester material synthesized from terephthalic acid and bio-ethylene glycol. The terephthalic acid is derived from lignin; the bio-ethylene glycol is derived from non-grain crops such as corn and sugarcane, reducing dependence on petroleum resources and aligning with environmental protection principles.

[0015] Furthermore, the copolymerized modified PET is prepared by esterification and polycondensation of terephthalic acid, ethylene glycol, polyethylene glycol, and SIPE. The SIPE is sodium isophthalic acid 5-sulfonate.

[0016] Preferably, the molecular weight of the polyethylene glycol is 600-1000 g / mol.

[0017] Furthermore, the amount of polyethylene glycol and SIPE added is 3-8 mol% of the total acid / total alcohol moles; the molar ratio of polyethylene glycol and polyethylene glycol to SIPE is 0.5-2:1.

[0018] Furthermore, the intrinsic viscosity of the copolymerized modified PET is 0.65-0.75 dL / g.

[0019] Furthermore, the copolymerized modified PET is obtained by the following preparation method: (a) Esterification reaction: Terephthalic acid, ethylene glycol, polyethylene glycol and SIPE are added to the esterification reactor. Under nitrogen protection, the temperature is raised to 230-250℃ to carry out the esterification reaction until the water output reaches more than 95% of the theoretical value, and the esterification product is obtained. (b) Polycondensation reaction: The esterification product is transferred to a polycondensation reactor, the temperature is gradually increased to 270-285℃, the pressure is gradually reduced to 50-100Pa, a catalyst and a stabilizer are added, and a polycondensation reaction is carried out to obtain copolymerized modified PET.

[0020] The catalyst is antimony trioxide, and the stabilizer is triphenyl phosphate.

[0021] Copolymer-modified PET outperforms bio-based PET in terms of moisture wicking, antistatic properties, softness, skin-friendliness, and breathability. Therefore, using copolymer-modified PET for the comfortable outer layer is more advantageous. Bio-based PET, on the other hand, is more environmentally friendly and lower in cost. Using bio-based PET for the reinforcing layer can reduce costs while maintaining overall rigidity and other performance characteristics.

[0022] As a preferred embodiment of the present invention, the thickness of the core fiber accounts for 40-50% of the total diameter of the composite fiber; the thickness of the reinforcing layer accounts for 20-30% of the total diameter of the composite fiber; and the thickness of the comfort outer layer accounts for 20-30% of the total diameter of the composite fiber.

[0023] As a preferred embodiment of the present invention, the amount of PTT added is 75-85% of the first spinning material, and the amount of graphene added is 1-2% of the first spinning material.

[0024] As a preferred embodiment of the present invention, the amount of bio-based PET added in the second spinning material is 70-80%, and the amount of nano-silica added in the second spinning material is 3-5%.

[0025] As a preferred embodiment of the present invention, the amount of copolymerized modified PET added in the third spinning material is 80-90%, and the amount of nano-ATO added in the third spinning material is 2-4%.

[0026] As a preferred embodiment of the present invention, the first / second / third spinning material further includes processing aids, which include at least one of dispersants, coupling agents, compatibilizers, lubricants, antioxidants, and heat stabilizers.

[0027] Further, the dispersant is at least one of sodium polycarboxylate, sodium polyacrylate, sodium polymethacrylate, polyvinylpyrrolidone, polyethylene glycol, and polyoxyethylene ether dispersants; the compatibilizer is at least one of silane coupling agents or maleic anhydride-grafted polyolefins.

[0028] In a preferred embodiment of the present invention, the graphene is modified with a silane coupling agent to improve its dispersibility.

[0029] In a preferred embodiment of the present invention, the nano-silica is modified by amylation to enhance its interfacial bonding. Specifically, the nano-silica is modified with the aminosilane coupling agent KH550.

[0030] Furthermore, the bio-based PET undergoes an alkali reduction treatment to improve its hydrophilicity.

[0031] The high-elasticity fabric of this invention has excellent elasticity, antistatic properties and softness, and is especially suitable for manufacturing high-end sportswear and smart wearable devices.

[0032] The preparation method of the high-elasticity fabric described above includes the following steps: S1. Prepare premixes for the core fiber, reinforcing layer, and comfort outer layer respectively; S2. The premixed material is spun using a coaxial electrospinning process, then cooled and shaped, and then stretched and heat-set to form composite fibers. S3. Interweave and wrap the composite fibers to obtain a high-elasticity fabric.

[0033] Furthermore, the co-extrusion spinning temperature is: inner layer temperature 270-275℃, middle layer temperature 275-280℃, and outer layer temperature 280-285℃; the spinning speed is 2000-4000m / min.

[0034] Furthermore, the spinning operation employs irregularly shaped cross-section spinning. The irregularly shaped cross-section can be cross-shaped, Y-shaped, or multi-leaf-shaped.

[0035] Irregular cross-sections can increase the specific surface area and surface grooves of fibers, forming a "wicking effect" that strongly guides the diffusion of sweat.

[0036] Furthermore, the cooling system is a gradient cooling system, with the first stage having a cooling air temperature of 20-30℃ and a wind speed of 0.3-0.8m / s; the second stage having a cooling air temperature of 15-25℃ and a wind speed of 0.5-1.0m / s; and the third stage having a cooling air temperature of 15-20℃ and a wind speed of 0.8-1.5m / s.

[0037] Furthermore, the stretching process employs a two-stage stretching method, with the first stage having a stretching ratio of 1.5-2.0 and a temperature of 75-85℃; and the second stage having a stretching ratio of 2.0-2.5 and a temperature of 100-120℃.

[0038] Furthermore, the heat setting process is a gradient heat setting, with an initial temperature of 150-200℃, held for 20-40 seconds; an intermediate temperature of 180-220℃, held for 40-80 seconds; and a final temperature of 200-250℃, held for 100-180 seconds.

[0039] Coaxial electrospinning involves simultaneously injecting a premix of core fiber, reinforcing layer, and comfort outer layer through a coaxial nozzle. Under the action of a high-voltage electric field, the three premixes converge and solidify at the end of the nozzle, forming a composite fiber with a core-shell structure.

[0040] The beneficial effects of this invention are: (1) The fabric of the present invention comprises composite fibers interwoven into a high-elasticity fabric, wherein the composite fibers include a core fiber, a reinforcing layer wrapped around the outer surface of the core fiber, and a comfort outer layer wrapped around the outer surface of the reinforcing layer; the core fiber, the reinforcing layer, and the comfort outer layer are respectively made of a first spinning material, a second spinning material, and a third spinning material through a coaxial electrospinning process. The core fiber provides excellent elasticity; the reinforcing layer provides structural strength and durability; and the comfort outer layer provides a skin-friendly feel and intelligent thermal and moisture management functions.

[0041] (2) This invention achieves multi-dimensional optimization of the performance of single fiber fabrics through layered gradient structure design and material composite, giving the fabric excellent elastic recovery rate, high mechanical strength, excellent thermal and moisture comfort and environmental friendliness, overcoming the technical problem that traditional elastic fabrics and comfortable fabrics are difficult to balance. Detailed Implementation

[0042] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with embodiments, is provided below.

[0043] Example 1 A high-elasticity fabric includes composite fibers interwoven to form the high-elasticity fabric. The composite fibers include a core fiber, a reinforcing layer wrapped around the outer surface of the core fiber, and a comfort outer layer wrapped around the outer surface of the reinforcing layer. Each layer comprises the following components in parts by weight: In the preparation of the above-mentioned copolymerized modified PET, each 5 mol% of comonomer includes the following raw materials: Terephthalic acid: 1 mol, ethylene glycol: 1.2 mol, polyethylene glycol (Mn=800): 0.03 mol, sodium isophthalic acid 5-sulfonate: 0.02 mol.

[0044] The copolymerized PET was obtained by the following preparation method: (a) Esterification reaction: Add the above raw materials to a 5L stainless steel esterification reactor, purge with nitrogen, and linearly raise the temperature to 240°C within 2 hours. Maintain the reaction pressure at atmospheric pressure and react for about 3 hours. When the output water reaches 98% of the theoretical value, the esterification reaction is complete. (b) Polycondensation reaction: The esterification product was transferred to a polycondensation reactor, and antimony trioxide (antimony trioxide) and triphenyl phosphate (triphenyl phosphate) were added as catalysts. The mass percentage of antimony trioxide was 0.03% of the mass of terephthalic acid, and the mass percentage of triphenyl phosphate was 0.05% of the mass of terephthalic acid. The temperature was raised to 280°C within 1 hour, while the pressure inside the reactor was linearly reduced to 80 Pa within 2 hours. The reaction was stopped after approximately 2 hours, when the intrinsic viscosity reached 0.70 dL / g. The product was then discharged and pelletized to obtain copolymerized modified PET chips.

[0045] The above-mentioned method for preparing high-elasticity fabric includes the following steps: S1. Prepare premixes for the core fiber, reinforcing layer, and comfort outer layer respectively; S2. The premixed material is spun using a coaxial electrospinning process, with the spinning speed controlled at 3000 m / min, and a cross-shaped irregular cross section is used for spinning; wherein, the inner layer spinning temperature is 272℃, the middle layer spinning temperature is 277℃, and the outer layer spinning temperature is 282℃. S3. Gradient cooling technology is used for cooling and shaping. The first stage of cooling air temperature is 25℃ and the air speed is 0.5m / s; the second stage of cooling air temperature is 20℃ and the air speed is 0.8m / s; the third stage of cooling air temperature is 18℃ and the air speed is 1.0m / s. S4. Perform two-stage drawing, wherein the first stage drawing ratio is 1.8 and the temperature is 80℃; the second stage drawing ratio is 2.2 and the temperature is 110℃. S5. Perform gradient heat setting, wherein the initial temperature is 180℃ and held for 30 seconds; the intermediate temperature is 200℃ and held for 60 seconds; and the final temperature is 220℃ and held for 120 seconds to obtain high elastic composite fiber. S6. Interweave and wrap the composite fibers to obtain a high-elasticity fabric.

[0046] Example 2 A high-elasticity fabric includes composite fibers interwoven to form the high-elasticity fabric. The composite fibers include a core fiber, a reinforcing layer wrapped around the outer surface of the core fiber, and a comfort outer layer wrapped around the outer surface of the reinforcing layer. Each layer comprises the following components in parts by weight: The preparation methods of the copolymerized modified PET and high-elasticity fabric in this embodiment are the same as in Example 1.

[0047] Example 3 A high-elasticity fabric includes composite fibers interwoven to form the high-elasticity fabric. The composite fibers include a core fiber, a reinforcing layer wrapped around the outer surface of the core fiber, and a comfort outer layer wrapped around the outer surface of the reinforcing layer. Each layer comprises the following components in parts by weight: The preparation methods of the copolymerized modified PET and high-elasticity fabric in this embodiment are the same as in Example 1.

[0048] Comparative Example 1 Compared with Example 1, the difference of this comparative example is that the amount of graphene added in the core fiber of this comparative example is 0, while the other components, preparation steps and parameters are the same.

[0049] Comparative Example 2 Compared with Example 1, the difference of this comparative example is that the amount of nano-silica added in the reinforcing layer of this comparative example is 0, while the other components, preparation steps and parameters are the same.

[0050] Comparative Example 3 Compared with Example 1, the difference in this comparative example is that the amount of nano-ATO added in the comfort outer layer of this comparative example is 0, while the other components, preparation steps and parameters are the same.

[0051] Comparative Example 4 Compared to Example 1, this comparative example differs in that the amounts of graphene, nano-silica, and nano-ATO added are all 0. All other components, preparation steps, and parameters remain the same.

[0052] Comparative Example 5 Compared with Example 1, the difference in this comparative example is that the materials of the comfort outer layer and the core fiber are interchanged. That is, the material of the core fiber of Example 1 is used to prepare the comfort outer layer, while the material of the comfort outer layer of Example 1 is used to prepare the core fiber. All other components, preparation steps and parameters are the same.

[0053] The composite fiber samples of Examples 1-3 and Comparative Examples 1-5 were subjected to the following performance tests. All tests were conducted under standard temperature and humidity conditions (20±2℃, 65±4%RH). The samples were conditioned for 24 hours under standard conditions before testing.

[0054] (1) Fracture strength and elongation at break Reference standard: GB / T3916-2013 "Determination of breaking strength and elongation at break of single yarn in a package of textiles (Crefour single yarn strength tester method)" Testing instrument: Electronic single yarn strength tester.

[0055] Test parameters: Clamping distance: 500mm; Stretching speed: 500 mm / min; Pre-tension: 0.5cN; Sample quantity: 50 single fibers were tested in each sample group, and the average value was taken.

[0056] Test procedure: Start the instrument and stretch the fiber at a constant speed until it breaks. The instrument automatically records the breaking strength and corresponding elongation throughout the process.

[0057] Wherein, breaking strength = breaking force (cN) / fiber linear density; Elongation at break (%) = (Elongation at break / Original clamping distance) × 100%.

[0058] (2) Initial modulus Reference standard: GB / T3916-2013 "Determination of breaking strength and elongation at break of single yarn in packaged textiles (Crefour single yarn strength tester method)".

[0059] The initial modulus is calculated as (stress increment within the linear segment of the curve) / (corresponding strain increment). The initial modulus is the slope of the initial linear portion of the stress-strain curve. This test uses the slope within the elongation range of 0.1%–1.0%. A higher initial modulus indicates a "harder" and "firmer" material, with a stronger resistance to initial deformation. A lower initial modulus indicates a "softer" and "more flexible" material, which deforms more easily under relatively small forces.

[0060] (3) Elastic recovery rate Reference standard: AATCC™ 146-2012 "Elastic properties of stretchable fabrics".

[0061] Test method: A single fiber is loaded into a tensile testing machine with a 500 mm clamping gap and stretched at 500 mm / min to 50% of the elongation at break. This elongation is maintained for 1 minute, and then the fiber is retracted to the original clamping gap at 500 mm / min and held for 1 minute. This cycle is repeated 5 times. The permanent deformation is recorded for the 1st and 5th cycles. The elastic recovery rate (%) is calculated as [1 - (permanent deformation / total elongation)] × 100%. The elastic recovery rates for the 1st and 5th cycles are reported to assess initial elasticity and fatigue resistance.

[0062] The test results are shown in Table 1.

[0063] Table 1 As shown in Table 1, the fracture strength and initial modulus of Examples 1-3 are significantly higher than those of Comparative Examples 1-4. This is attributed to the reinforcing effect of graphene in the core layer and the reinforcing effect of nano-silica in the middle layer, which synergistically improve the overall rigidity and load-bearing capacity of the fiber. Combining the initial elasticity and fatigue elasticity, the elastic recovery rate of Examples 1-3 is higher than that of Comparative Examples 1-5, demonstrating that the core layer of the PTT and graphene composite is key to providing high elasticity and high resilience. Comparative Example 5, however, has low fracture strength and elongation at break, but high initial modulus, indicating that it is generally brittle, lacks toughness, has a poor hand feel, and has an even worse elastic recovery rate, making it unsuitable for fabrication.

[0064] In summary, this technical solution successfully optimizes the overall performance of fibers through the synergistic effect of various functional components and a scientific structural layout, fully demonstrating its technical advantages.

[0065] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A high stretch fabric, characterized by, The composite fiber interwoven into high-elastic fabric includes a core fiber, a reinforcing layer wrapped outside the core fiber, and a comfortable outer layer wrapped outside the reinforcing layer; The core fiber, the reinforcing layer, and the comfortable outer layer are respectively made of a first spinning material, a second spinning material, and a third spinning material to form the composite fiber through a coaxial electrospinning process; The first spinning material for forming the core fiber includes a mixture of PTT and graphene; The second spinning material for forming the reinforcing layer includes a mixture of bio-based PET and nano-silicon dioxide; The third spinning material for forming the comfortable outer layer includes a mixture of copolymerized modified PET and nano-ATO.

2. The high stretch fabric of claim 1, wherein, The copolymerized modified PET is obtained through the following preparation method: (a) esterification reaction: terephthalic acid, ethylene glycol, polyethylene glycol, and SIPE are added into an esterification reactor, and the temperature is raised to 230-250°C under nitrogen protection, and the esterification reaction is carried out until the water output reaches more than 95% of the theoretical value to obtain an esterification product; (b) polycondensation reaction: the esterification product is transferred into a polycondensation reactor, and the temperature is gradually raised to 270-285°C, and the pressure is gradually reduced to 50-100 Pa, and a catalyst and a stabilizer are added, and the polycondensation reaction is carried out to obtain the copolymerized modified PET.

3. The high stretch fabric of claim 2, wherein, The molecular weight of the polyethylene glycol is 600-1000 g / mol; the addition amount of the polyethylene glycol and SIPE is 3-8 mol% of the total acid / total alcohol; the molar ratio of the polyethylene glycol and the polyethylene glycol and SIPE is 0.5-2:1; the intrinsic viscosity of the copolymerized modified PET is 0.65-0.75 dL / g.

4. The high stretch fabric of claim 1, wherein, The thickness of the core fiber accounts for 40-50% of the total diameter of the composite fiber; the thickness of the reinforcing layer accounts for 20-30% of the total diameter of the composite fiber; and the thickness of the comfortable outer layer accounts for 20-30% of the total diameter of the composite fiber.

5. The high stretch fabric of claim 1, wherein, The addition amount of the PTT in the first spinning material accounts for 75-85%, and the addition amount of the graphene in the first spinning material accounts for 1-2%; The addition amount of the bio-based PET in the second spinning material accounts for 70-80%, and the addition amount of the nano-silicon dioxide in the second spinning material accounts for 2-5%; The addition amount of the copolymerized modified PET in the third spinning material accounts for 80-90%, and the addition amount of the nano-ATO in the third spinning material accounts for 2-4%.

6. The high stretch fabric of claim 1, wherein, The first / second / third spinning material further includes a processing aid, and the processing aid includes at least one of a dispersant, a coupling agent, a compatibilizer, a lubricant, an antioxidant, and a heat stabilizer.

7. A high stretch fabric according to claim 6, wherein, The dispersant is at least one of polycarboxylic acid sodium, polyacrylic acid sodium, polymethacrylic acid sodium, polyvinylpyrrolidone, polyethylene glycol, and polyoxyethylene ether dispersant; and the compatibilizer is at least one of a silane coupling agent or a maleic anhydride grafted polyolefin.

8. The high stretch fabric of claim 1, wherein, The bio-based PET is a PET containing 30% bio-based PET; The graphene is modified by a silane coupling agent; The nano-silicon dioxide is modified by an amino silane coupling agent KH550.

9. A method of producing a high stretch fabric as claimed in any one of claims 1 to 8, characterised in that, The preparation method includes the following steps: S1, respectively preparing the premix of the core fiber, the reinforcing layer, and the comfortable outer layer; S2, the premix is spun by coaxial electrospinning process, then cooled and shaped, and then drawn and heat set to form composite fibers; S3, the composite fibers are interwoven and wound to obtain high-elasticity fabric.

10. The method of claim 9, wherein, The spinning operation adopts profiled cross-section spinning; the temperature of the co-extrusion spinning is: inner layer temperature 270-275 DEG C, middle layer temperature 275-280 DEG C, and outer layer temperature 280-285 DEG C; and the spinning speed is 2000-4000 m / min; The cooling and shaping is gradient cooling, the first-stage cooling air temperature is 20-30 DEG C, the air speed is 0.3-0.8 m / s; the second-stage cooling air temperature is 15-25 DEG C, the air speed is 0.5-1.0 m / s; and the third-stage cooling air temperature is 15-20 DEG C, the air speed is 0.8-1.5 m / s; The drawing treatment adopts two-stage drawing, the first-stage drawing multiple is 1.5-2.0, and the temperature is 75-85 DEG C; the second-stage drawing multiple is 2.0-2.5, and the temperature is 100-120 DEG C; The heat setting treatment is gradient heat setting, the initial temperature is 150-200 DEG C, and is maintained for 20-40 seconds; the intermediate temperature is 180-220 DEG C, and is maintained for 40-80 seconds; and the final temperature is 200-250 DEG C, and is maintained for 100-180 seconds.

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