High-elasticity fabric and preparation method thereof

Abstract

The present application relates to a kind of high elastic fabric and its preparation method, belong to the technical field of fabric manufacturing.The high elastic fabric, including the composite fiber interwoven into high elastic fabric, the composite fiber includes core fiber, the reinforcing layer wrapped in the outer surface of the core fiber and the comfortable outer layer wrapped in the outer surface of the reinforcing layer;The core fiber, reinforcing layer and comfortable outer layer are respectively made from first spinning material, second spinning material and third spinning material by coaxial electrospinning process to form the composite fiber;The first spinning material forming the core fiber includes the mixture of PTT, graphene;Second spinning material forming the reinforcing layer includes the mixture of bio-based PET and nanometer silicon dioxide;Third spinning material forming the comfortable outer layer includes the mixture of copolymer modified PET, nano ATO.The fabric in the present application, core fiber provides excellent elasticity;Reinforcing layer provides structural strength and durability;Comfortable outer layer provides skin-friendly touch and intelligent heat and moisture management function.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of fabric manufacturing, and more particularly relates to a high-elasticity fabric and a preparation method thereof. BACKGROUND

[0002] With the increasing demand of consumers for clothing performance, fabrics with excellent elasticity and wearing comfort have become the focus of 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 moisture comfort, insufficient air permeability, easy yellowing under the action of light, heat, chlorine, etc., and poor compound fastness with mainstream substrates such as polyester, which limits its application in high-end functional clothing.

[0004] As an alternative, polytrimethylene terephthalate (PTT) fibers exhibit good "shape memory" elasticity and soft hand feeling due to their unique molecular structure. However, studies have shown that pure PTT fibers still have room for improvement in terms of elastic recovery speed and long-term stability under high-strength or frequent stretching conditions, especially when dealing with the harsh requirements of professional sports.

[0005] Polyester (polyethylene terephthalate, PET) is an important variety of synthetic fibers, which is widely used in the fields of textiles, industry, etc. due to its excellent mechanical properties, heat resistance and chemical stability, 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 air permeability, easy pilling, poor dyeing performance, easy static electricity, etc., which are difficult to meet the requirements of modern textiles for high elasticity, comfort and functionality, limiting its further application.

[0007] Therefore, developing a high-performance modified polyester fiber that combines high elasticity, high durability, and excellent comfort, especially maintaining stable performance under high temperature and high pressure conditions, and meeting the green and environmentally friendly concept, has important theoretical significance and practical application value for promoting the technological progress of the textile material industry. SUMMARY

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

[0009] The purpose of the present application can be achieved by the following technical solutions:

[0010] A high-elasticity fabric includes composite fibers interwoven into the high-elasticity fabric, the composite fibers including a core fiber, a reinforcing layer wrapped outside the core fiber, and a comfortable outer layer wrapped outside the reinforcing layer;

[0011] 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 fibers through a coaxial electrospinning process.

[0012] The first spinning material to form the core fiber includes a mixture of PTT and graphene;

[0013] The second spinning material to form the reinforcing layer includes a mixture of bio-based PET and nano-silica;

[0014] The third spinning material to form the comfortable outer layer includes a mixture of copolymer modified PET and nano-ATO.

[0015] In the core fiber of the technical solution, the inherent elasticity of PTT (polypropylene terephthalate) and the physical cross-linking network formed by graphene nanosheets synergistically act, greatly enhancing the creep resistance and elastic recovery rate of the fiber, so that it can quickly restore to its original state after a large amount of stretching.

[0016] In the reinforcing layer, as a bridge connecting the core layer and the outer layer, and providing structural support for the entire fiber. Bio-based PET (polyethylene terephthalate) provides good chemical compatibility with the outer layer, ensuring the interlayer bonding force. The introduced nano-silica particles, with their extremely high hardness, chemical stability, and large specific surface area, are uniformly dispersed in the PET matrix, like "aggregate" in reinforced concrete, effectively preventing the propagation of micro-cracks, thereby greatly improving the overall rigidity, wear resistance, and tear strength of the composite material.

[0017] In the comfortable outer layer, copolymer modified PET (polyethylene terephthalate) ensures that the outer layer of the fabric has excellent skin-friendliness, softness, drape, and good dyeing performance. Nano-ATO (antimony-doped tin dioxide) is a highly efficient n-type semiconductor material that can effectively absorb and emit specific wavelengths of infrared light, thereby reducing heat loss from the human body in cold weather and promoting heat radiation in hot weather, helping the body to dissipate heat, achieving passive body temperature regulation, improving all-weather wearing comfort, and also helping to improve the antistatic performance of the fabric.

[0018] Further, the bio-based PET is a PET containing 30% bio-based.

[0019] Specifically, the bio-based is a polyester material synthesized from terephthalic acid and bio-ethylene glycol. The terephthalic acid is derived from lignin, and the bio-ethylene glycol is derived from non-food crops such as corn and sugarcane, reducing dependence on petroleum resources and conforming to the environmental protection concept.

[0020] Further, the copolymer modified PET is prepared by esterification and polycondensation reaction of terephthalic acid, ethylene glycol, polyethylene glycol and SIPE. The SIPE is 5-sulfonic acid sodium isophthalic acid.

[0021] Preferably, the molecular weight of the polyethylene glycol is 600-1000 g / mol.

[0022] Further, the adding amount of the polyethylene glycol and SIPE is 3-8 mol% of the total acid / total alcohol moles; and the molar ratio of the polyethylene glycol and the polyethylene glycol and SIPE is 0.5-2:1.

[0023] Further, the intrinsic viscosity of the copolymer modified PET is 0.65-0.75 dL / g.

[0024] Further, the copolymer modified PET is obtained by the following preparation method:

[0025] (a) esterification reaction: terephthalic acid, ethylene glycol, polyethylene glycol and SIPE are added into an esterification reactor, heated to 230-250℃ under nitrogen protection, and esterification reaction is carried out until the water output reaches more than 95% of the theoretical value, to obtain an esterification product;

[0026] (b) polycondensation reaction: the esterification product is transferred into a polycondensation reactor, gradually heated to 270-285℃, the pressure is gradually reduced to 50-100 Pa, a catalyst and a stabilizer are added, and polycondensation reaction is carried out to obtain the copolymer modified PET.

[0027] The catalyst is antimony trioxide, and the stabilizer is triphenyl phosphate.

[0028] The copolymer modified PET is superior to the bio-based PET in terms of moisture wicking, antistatic, softness, skin friendliness and air permeability, etc., so it is more advantageous to use the copolymer modified PET to prepare the comfortable outer layer. The bio-based PET is more green and environmentally friendly, and the cost is low, so the use of the bio-based PET in the reinforcing layer can reduce the cost while taking into account the overall rigidity and other properties.

[0029] As a preferred technical solution of the present application, 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.

[0030] As a preferred technical solution of the present application, the adding amount of the PTT in the first spinning material accounts for 75-85%, and the adding amount of the graphene in the first spinning material accounts for 1-2%.

[0031] As a preferred technical solution of the present application, the adding amount of the bio-based PET in the second spinning material accounts for 70-80%, and the adding amount of the nano-silicon dioxide in the second spinning material accounts for 3-5%.

[0032] As a preferred technical solution of the present application, the adding amount of the copolymer modified PET in the third spinning material accounts for 80-90%, and the adding amount of the nano-ATO in the third spinning material accounts for 2-4%.

[0033] As a preferred technical solution of the present application, the first / second / third spinning material further comprises a processing aid, and the processing aid comprises at least one of a dispersant, a coupling agent, a compatibilizer, a lubricant, an antioxidant, and a heat stabilizer.

[0034] Further, the dispersant is at least one of sodium polycarboxylate, sodium polyacrylate, sodium polymethacrylate, polyvinylpyrrolidone, polyethylene glycol, and a polyoxyethylene ether dispersant; and the compatibilizer is at least one of a silane coupling agent or a maleic anhydride grafted polyolefin.

[0035] As a preferred technical solution of the present application, the graphene is modified by a silane coupling agent, so as to improve the dispersibility of the graphene.

[0036] As a preferred technical solution of the present application, the nano-silicon dioxide is modified by amination, so as to enhance the interface bonding. Specifically, the nano-silicon dioxide is modified by an amino silane coupling agent KH550.

[0037] Further, the bio-based PET is treated by alkali reduction, so as to improve the hydrophilicity.

[0038] The high-elasticity fabric has excellent elasticity, antistatic property, and softness, and is particularly suitable for preparing high-end sportswear and smart wearable devices.

[0039] The preparation method of the high-elasticity fabric includes the following steps:

[0040] S1, preparing a premix of core fibers, a reinforcing layer, and a comfortable outer layer, respectively;

[0041] S2, spinning the premix by using a coaxial electrospinning process, then cooling and setting, and then performing drawing and heat setting treatment to form a composite fiber;

[0042] S3, interweaving and winding the composite fiber to obtain the high-elasticity fabric.

[0043] Further, the temperature of the co-extrusion spinning is: the temperature of the inner layer is 270-275 DEG C, the temperature of the middle layer is 275-280 DEG C, and the temperature of the outer layer is 280-285 DEG C; and the spinning speed is 2000-4000 m / min.

[0044] Further, the spinning operation adopts profiled cross-section spinning. The profiled cross-section is cross-shaped, Y-shaped or multi-leaf-shaped.

[0045] The profiled cross-section can increase the specific surface area and surface groove of the fiber, form a "wicking effect" and strongly guide the diffusion of sweat.

[0046] Further, the cooling and setting 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; the third-stage cooling air temperature is 15-20 DEG C, the air speed is 0.8-1.5 m / s.

[0047] Further, the drawing treatment adopts two-stage drawing, the first-stage drawing multiple is 1.5-2.0, the temperature is 75-85 DEG C; the second-stage drawing multiple is 2.0-2.5, the temperature is 100-120 DEG C.

[0048] Further, the heat setting treatment is gradient heat setting, the initial temperature is 150-200 DEG C, the holding time is 20-40 seconds; the intermediate temperature is 180-220 DEG C, the holding time is 40-80 seconds; the final temperature is 200-250 DEG C, the holding time is 100-180 seconds.

[0049] The coaxial electrospinning is to inject the core fiber, the reinforcing layer and the pre-mixed material of the comfortable outer layer through the coaxial nozzle at the same time, under the action of high-voltage electric field, the three pre-mixed materials converge at the end of the nozzle and solidify to form the composite fiber with the core-shell structure.

[0050] The beneficial effects of the present application are as follows:

[0051] (1) The fabric of the present application comprises the composite fiber interwoven into the high-elasticity fabric, the composite fiber comprises the core fiber, the reinforcing layer wrapped outside the core fiber and the comfortable outer layer wrapped outside the reinforcing layer; the core fiber, the reinforcing layer and the comfortable outer layer are respectively made of the first spinning material, the second spinning material and the third spinning material through the coaxial electrospinning process to form the composite fiber. The core fiber provides excellent elasticity; the reinforcing layer provides structural strength and durability; and the comfortable outer layer provides skin-friendly touch and intelligent heat and moisture management function.

[0052] (2) The present application realizes the multi-dimensional optimization of the performance of single fiber fabric through the layered gradient structure design and material compounding, endows the fabric with excellent elastic recovery rate, high mechanical strength, excellent heat and moisture comfort and environmental friendliness, and overcomes the technical difficulties that the performance of traditional elastic fabric and comfortable fabric is difficult to be considered. DETAILED DESCRIPTION

[0053] In order to further illustrate the technical means and effects adopted by the present application to achieve the predetermined object, the following embodiments are combined to illustrate the specific embodiments, structure, features and effects of the present application.

[0054] Embodiment 1

[0055] A high-elasticity fabric includes composite fibers interwoven into the high-elasticity fabric, the composite fibers including a core fiber, a reinforcing layer wrapped outside the core fiber, and a comfort outer layer wrapped outside the reinforcing layer; each layer includes the following components in parts by weight:

[0056]

[0057] In the preparation of the above copolymerized modified PET, 5 mol% of the comonomer includes the following raw materials:

[0058] Terephthalic acid: 1 mol, ethylene glycol: 1.2 mol, polyethylene glycol (Mn=800): 0.03 mol, 5-sodium sulfonate isophthalic acid: 0.02 mol.

[0059] In the preparation of the above copolymerized modified PET, 5 mol% of the comonomer includes the following raw materials:

[0060] (a) Esterification reaction: the above raw materials are added to a 5L stainless steel esterification reactor, protected by nitrogen, linearly heated to 240℃ within 2 hours, the reaction pressure is maintained at atmospheric pressure, the reaction is about 3 hours, when the water output reaches 98% of the theoretical value, the esterification reaction is completed;

[0061] (b) Polycondensation reaction: the esterification product is transferred to a polycondensation kettle, and catalyst antimony trioxide and stabilizer triphenyl phosphate are added. The mass percentage of antimony trioxide is 0.03% of the mass of terephthalic acid; the mass percentage of triphenyl phosphate is 0.05% of the mass of terephthalic acid. The temperature is raised to 280℃ within 1 hour, and the pressure in the kettle is linearly reduced to 80Pa within 2 hours. The reaction is about 2 hours, when the intrinsic viscosity reaches 0.70dL / g, the reaction is stopped, the material is discharged and pelletized, and the copolymerized modified PET chip is obtained.

[0062] The preparation method of the above high-elasticity fabric includes the following steps:

[0063] S1, respectively preparing the premix of the core fiber, the reinforcing layer and the comfort outer layer;

[0064] S2, using coaxial electrospinning process to spin the premix, controlling the spinning speed at 3000m / min, and using cross-shaped profiled cross-section spinning; wherein the inner layer spinning temperature is 272℃, the middle layer spinning temperature is 277℃, and the outer layer spinning temperature is 282℃;

[0065] S3, cooling and setting by gradient cooling technology, wherein the first section cooling air temperature is 25℃, the air speed is 0.5m / s; the second section cooling air temperature is 20℃, the air speed is 0.8m / s; the third section cooling air temperature is 18℃, the air speed is 1.0m / s;

[0066] S4, two-stage drawing, wherein the first stage drawing ratio is 1.8, the temperature is 80℃; the second stage drawing ratio is 2.2, the temperature is 110℃;

[0067] S5, gradient heat setting, wherein the initial temperature is 180℃, the holding time is 30 seconds; the intermediate temperature is 200℃, the holding time is 60 seconds; the final temperature is 220℃, the holding time is 120 seconds, to obtain high-elasticity composite fibers;

[0068] S6, interweaving and winding the composite fibers to obtain high-elasticity fabric.

[0069] Example 2

[0070] A high-elasticity fabric includes composite fibers interwoven into high-elasticity fabric, the composite fibers including core fibers, a reinforcing layer wrapped outside the core fibers, and a comfort outer layer wrapped outside the reinforcing layer; each layer includes the following components by weight:

[0071]

[0072] The preparation method of the copolymer modified PET and high-elasticity fabric of the present example is the same as that of Example 1.

[0073] Example 3

[0074] A high-elasticity fabric includes composite fibers interwoven into high-elasticity fabric, the composite fibers including core fibers, a reinforcing layer wrapped outside the core fibers, and a comfort outer layer wrapped outside the reinforcing layer; each layer includes the following components by weight:

[0075]

[0076] The preparation method of the copolymer modified PET and high-elasticity fabric of the present example is the same as that of Example 1.

[0077] Comparative Example 1

[0078] Compared with Example 1, the difference of the present comparative example is that the addition amount of graphene in the core fibers of the present comparative example is 0, and the rest of the components, preparation steps and parameters are consistent.

[0079] Comparative Example 2

[0080] The difference between the comparative example and Example 1 is that the amount of nano-silica added in the reinforcing layer of the comparative example is 0, and the rest of the components, preparation steps and parameters are consistent.

[0081] Comparative Example 3

[0082] The difference between the comparative example and Example 1 is that the amount of nano-ATO added in the comfort outer layer of the comparative example is 0, and the rest of the components, preparation steps and parameters are consistent.

[0083] Comparative Example 4

[0084] The difference between the comparative example and Example 1 is that the amounts of graphene, nano-silica and nano-ATO added in the comparative example are all 0. The rest of the components, preparation steps and parameters are consistent.

[0085] Comparative Example 5

[0086] The difference between the comparative example and Example 1 is that the materials of the comfort outer layer and the core fiber of the comparative example are replaced with each other, i.e. the material of the core fiber of Example 1 is used to prepare the comfort outer layer, and the material of the comfort outer layer of Example 1 is used to prepare the core fiber, and the rest of the components, preparation steps and parameters are consistent.

[0087] The composite fiber samples of Examples 1-3 and Comparative Examples 1-5 are respectively subjected to the following performance tests, wherein all tests are carried out in a standard temperature and humidity environment (20±2℃, 65±4%RH), and the samples are conditioned in the standard environment for 24 hours before testing.

[0088] (1) Breaking strength and elongation at break

[0089] Reference standard: GB / T3916-2013 "Determination of Breaking Force and Elongation of Single Yarn of Textile Package (Crefour Type Single Yarn Strength Machine Method)"

[0090] Test instrument: electronic single yarn strength machine.

[0091] Test parameters:

[0092] Grip distance: 500mm;

[0093] Tensile speed: 500mm / min;

[0094] Pre-tension: 0.5cN;

[0095] Sample quantity: 50 single fibers are tested for each group of samples, and the average value is taken.

[0096] Test process: start the instrument to stretch the fiber at a constant speed until it breaks. The instrument automatically records the breaking strength and the corresponding elongation during the entire process.

[0097] Wherein, breaking strength = breaking force (cN) / fiber linear density;

[0098] Breaking elongation (%) = (elongation at break / original gauge) x 100%.

[0099] (2) Initial modulus

[0100] Reference standard: GB / T 3916-2013 "Determination of breaking force and elongation of single yarn of textile package (Crefour type single yarn strength machine method)".

[0101] Wherein, initial modulus = (stress increment in linear section of curve) / (corresponding strain increment). The initial modulus is the slope of the initial linear part of the stress-strain curve. The slope in the interval of elongation of 0.1%-1.0% is taken in this test. The higher the initial modulus, the harder and stiffer the material is, and the stronger the resistance to initial deformation. The lower the initial modulus, the softer and more flexible the material is, and it is easier to deform under the action of smaller force.

[0102] (3) Elastic recovery rate

[0103] Reference standard: AATCC TM 146-2012 "Elastic properties of stretch woven fabrics".

[0104] Test method: Single fiber is loaded into the strength machine with a gauge of 500 mm, stretched to 50% of the breaking elongation at a speed of 500 mm / min, kept at this elongation state for 1 minute, and retracted to the original gauge at a speed of 500 mm / min, kept for 1 minute. Repeat the above cycle 5 times. Record the permanent deformation of the 1st and 5th cycles. Wherein, the elastic recovery rate (%) = [1-(permanent deformation / total elongation)] x 100%; report the elastic recovery rate of the 1st and 5th cycles to evaluate the initial elasticity and fatigue resistance.

[0105] The test results are shown in Table 1.

[0106] Table 1

[0107]

[0108] From the test results in Table 1, it can be seen that the breaking strength and initial modulus of Examples 1-3 are significantly higher than those of Comparative Examples 1-4. This is due to the reinforcing effect of graphene in the core layer and the reinforcing effect of nano-silica in the intermediate layer, which synergistically improves the overall rigidity and load-bearing capacity of the fiber. In combination with the initial elasticity and fatigue resistance, the elastic recovery rate of Examples 1-3 is higher than that of Comparative Example 1-5, which proves that the PTT and graphene composite core layer is the key to providing high elasticity and high recovery. The breaking strength and elongation at break of Comparative Example 5 are low, but the initial modulus is high, indicating that Comparative Example 5 is overall brittle, lacks toughness, has poor hand feeling, and has a poorer elastic recovery rate, and is not suitable for preparing into fabric.

[0109] In summary, the technical scheme successfully optimizes the comprehensive performance of the fiber through the synergistic effect of various functional components and the scientific structure layout, fully demonstrating its technical advantages.

[0110] The above is only a preferred embodiment of the present application, and does not limit the present application in any form. Although the present application has been disclosed as above with a preferred embodiment, it is not intended to limit the present application. Any person skilled in the art can make some changes or modifications to the above disclosed technical content without departing from the scope of the technical scheme of the present application, and any equivalent embodiments with equivalent changes and modifications made on the basis of the technical essence of the present application to the above embodiments are still within the scope of the technical scheme of the present application.

Claims

1. A high stretch fabric, characterized by, The composite fiber includes a core fiber, a reinforcing layer wrapped outside the core fiber, and a comfortable outer layer wrapped outside the reinforcing layer, and 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. The first spinning material forming the core fiber includes a mixture of PTT and graphene. The second spinning material forming the reinforcing layer includes 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. The copolymerized modified PET is obtained by 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 DEG 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 DEG 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. 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; and the molar ratio of the polyethylene glycol and SIPE is (0.5-2):

1. The inherent viscosity of the copolymerized modified PET is 0.65-0.75 dL / g. 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.

2. 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%.

3. The high stretch fabric of claim 1, wherein, The addition amount of the bio-based PET in the second spinning material accounts for 70-80%, and the addition amount of the nano-silica 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%. 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.

4. The high stretch fabric of claim 1, 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 a silane coupling agent or a maleic anhydride grafted polyolefin.

5. A high stretch fabric according to claim 4, wherein, The bio-based PET is a PET containing 30% bio-based PET.

6. The high stretch fabric of claim 1, wherein, The graphene is modified by a silane coupling agent. The nano-silica is modified by an amino silane coupling agent KH550. The preparation method includes the following steps:

7. A method of producing a high stretch fabric as claimed in any one of claims 1 to 6, characterised in that, ​ S1, respectively preparing core fiber, reinforcing layer and comfort outer layer pre-mixture; S2, using coaxial electrospinning process to spin the pre-mixture, then cooling and setting, and then drawing and heat setting to form composite fiber; S3, interweaving and winding the composite fiber to obtain high-elasticity fabric.

8. The production method according to claim 7, characterized by, The temperature of the spinning operation is: inner layer temperature 270-275℃, middle layer temperature 275-280℃, outer layer temperature 280-285℃; the spinning speed is 2000-4000m / min; The cooling and setting is gradient cooling, the first stage cooling air temperature is 20-30℃, air speed 0.3-0.8m / s; the second stage cooling air temperature is 15-25℃, air speed 0.5-1.0m / s; the third stage cooling air temperature is 15-20℃, air speed 0.8-1.5m / s; The drawing treatment uses two-stage drawing, the first stage drawing multiple is 1.5-2.0, temperature is 75-85℃; the second stage drawing multiple is 2.0-2.5, temperature is 100-120℃; The heat setting treatment is gradient heat setting, the initial temperature is 150-200℃, maintaining 20-40 seconds; the intermediate temperature is 180-220℃, maintaining 40-80 seconds; the final temperature is 200-250℃, maintaining 100-180 seconds.

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