A kind of spandex-free elastic woven fabric and preparation method thereof

Abstract

This invention discloses a spandex-free stretch woven fabric and its preparation method. The fabric utilizes graphene / nanosilica-modified PBT / PTT composite fibers as warp yarns to create a "spring-damping" elastic structure. The face warp yarns utilize ultrafine nylon coated with carbon nanotubes to reduce surface friction. The weft yarns utilize Yaser / PTT bicomponent core-spun yarns to achieve synergistic transverse elasticity and moisture absorption and conduction. Furthermore, the fabric utilizes an AI tension control system and magnetic levitation weft insertion technology for precision weaving. Digital twinning optimizes the bionic sine wave structure to ensure that the fabric's stress distribution is more consistent with human motion patterns. Supercritical CO2 waterless dyeing and finishing technology is used to prevent fiber damage. Finally, graphene nanosheet padding enhances electrical conductivity and wear resistance. This invention achieves the integration of high elasticity, high durability, and intelligent response.

Description

Technical Field

[0001] The present invention relates to the technical field of woven fabrics and weaving methods, and in particular to woven fabrics characterized by the yarns or other warp and weft materials or structures used, specifically to a non-spandex elastic woven fabric and a preparation method thereof. Background Art

[0002] Traditional stretch fabrics primarily rely on spandex (polyurethane fiber) for elasticity. While spandex offers excellent elongation and resilience, its inherent drawbacks are becoming increasingly prominent. Spandex is prone to aging and breaking over time and is difficult to dye, limiting color options. Furthermore, spandex is expensive to produce and difficult to recycle, making it incompatible with sustainable development. Especially in applications involving frequent contact with chlorine or sweat, such as swimwear and sportswear, spandex's poor chlorine and chemical resistance can lead to a decline in fabric performance. Therefore, the market urgently needs new woven fabrics that offer excellent elasticity and durability without relying on spandex. In recent years, research on spandex-free stretch fabrics has become a hot topic, primarily achieving elasticity through fiber modification, yarn structure design, and fabric structure optimization.

[0003] Existing methods for achieving elasticity in non-spandex stretch woven fabrics primarily rely on highly elastic fibers (such as PBT and PTT) or core-spun yarn structures. However, these methods have significant limitations. For example, single highly elastic fibers have limited elastic performance and are prone to fatigue due to repeated stretching. While core-spun yarns can improve elasticity, the process is complex and costly. Furthermore, traditional weaving techniques struggle to precisely control yarn tension, resulting in uneven elasticity and compromising wearer comfort. Dyeing and finishing also present challenges. Conventional dyeing processes have low dye uptake and poor color fastness for highly elastic fibers, while high-temperature treatment can damage the fiber's elastic properties. Existing fabrics are prone to elasticity loss after repeated washings and lack intelligent response capabilities, making them unsuitable for high-end applications.

[0004] Therefore, it is necessary to improve the preparation method of the non-spandex stretch woven fabric in the prior art to solve the above problems. Summary of the Invention

[0005] The present invention overcomes the deficiencies of the prior art and provides a spandex-free stretch woven fabric and a preparation method thereof, aiming to solve the problems of insufficient elasticity of a single fiber, low precision of the weaving process, large damage in the dyeing and finishing process, and single function in the prior art.

[0006] To achieve the above object, the present invention adopts the following technical solution: a method for preparing a spandex-free stretch woven fabric, comprising:

[0007] S1. Prepare warp yarn, face warp yarn and weft yarn, wherein the warp yarn is prepared by blending graphene and nano-silica modified PBT / PTT fiber and blending shape memory polymer staple fiber; the face warp yarn is prepared by ultrafine denier nylon coated with carbon nanotubes; and the weft yarn is prepared by Yaser and PTT bicomponent core-spun yarn;

[0008] S2. Pre-treating the warp yarn and the weft yarn, wherein the warp yarn is activated and the weft yarn is cleaned;

[0009] S3. Intelligently weaving the warp and weft yarns to form a base fabric having a bionic sinusoidal wave binding structure, wherein the bionic sinusoidal wave binding structure is a continuous curvature binding path that simulates the bending curvature and motion stress distribution of human joints;

[0010] S4, supercritical CO2 dyeing and finishing of base fabrics;

[0011] S5. The dyed fabric is treated by graphene nanosheet padding to obtain a spandex-free stretch woven fabric.

[0012] In a preferred embodiment of the present invention, the preparation of the warp yarn in step S1 includes the following sub-steps:

[0013] PBT / PTT chips are blended and melted with graphene masterbatch and nano-silica, and extruded through a twin-screw spinning machine to form composite filaments; wherein the mass ratio of PBT to PTT is 1-1.3:1, the flake diameter of the graphene masterbatch is 50-100 nm and the proportion is 0.3-0.5%, the particle size of the nano-silica is 20-30 nm and the proportion is 0.1-0.3%, the melting temperature of the PBT / PTT chips is 260-270°C, the mixing time is 15-20 min, and the rotation speed is 300-400 rpm; the screw diameter of the twin-screw spinning machine is Φ45 mm, the aspect ratio L / D=32:1, the spinning nozzle aperture is 0.2-0.25 mm, and the number of spinneret holes is 24-36 holes;

[0014] The composite filaments are blended with shape memory polymer staple fibers through a drawing frame to form a blended yarn; wherein the SMP has a length of 38-51 mm and accounts for 10% of the total warp yarns, the number of doublings is 6-8, the roller gauge is 32-35 mm, and the delivery speed is 40-45 m / min;

[0015] The blended yarn is subjected to multi-stage drawing treatment to obtain a modified composite warp yarn; wherein, the first-stage drawing temperature is 80-85°C, the drawing ratio is 3.5-3.7:1; the second-stage drawing temperature is 120-125°C, the drawing ratio is 1.2-1.5:1; and the winding speed is 3500-3800 m / min.

[0016] In a preferred embodiment of the present invention, the preparation of the face warp yarn in step S1 includes the following sub-steps:

[0017] Ultrafine denier nylon filaments were used as the substrate and pretreated with 5% NaOH solution to remove the surface oil. The denier of the ultrafine denier nylon filaments was 0.4-0.6D, the diameter of the single filament was 10-20 μm, the pretreatment temperature was 60°C, and the treatment time was 10 minutes.

[0018] Under argon protection, chemical vapor deposition is used to uniformly load carbon nanotubes on the surface of nylon fibers to form a functional coating; the argon flow rate is 400-500sccm, the carbon source is methane with a flow rate of 80-100sccm, the reaction temperature is 600-650℃, and the coating time is 10-15min; the diameter of the quartz tube of the chemical vapor deposition device is Φ80-100mm, and the length of the heating zone is 250-300mm; the diameter of the carbon nanotubes is 10-20nm, the purity is ≥95%, and the loading amount is 0.1-0.15%.

[0019] In a preferred embodiment of the present invention, the preparation of the weft yarn in step S1 includes the following sub-steps:

[0020] PTT staple fiber is used as the core layer, and the outer layer is selected from Yassel staple fiber with a groove structure. The Yassel staple fiber is evenly covered on the surface of the PTT core yarn through a ring spinning frame to form a two-component core-spun yarn; among them, the length of the PTT staple fiber and the Yassel staple fiber are both 35-40mm, and the mass ratio of PTT to Yassel is 1:2.2-2.4; the spindle speed of the ring spinning frame is 15000-16000rpm, the tension of the PTT core yarn is 3-5cN, the back zone drafting multiple is 1.2-1.3 times, and the twist is 101.3-105.6 twists / 10cm.

[0021] In a preferred embodiment of the present invention, the activation treatment of the warp yarn in step S2 adopts atmospheric pressure low-temperature plasma technology, with argon-oxygen mixed gas as the medium; wherein the volume ratio of argon to oxygen is 3-3.5:1, and the total flow rate is 200-300sccm; radio frequency power supply is used for treatment, with a frequency of 13-14MHz, a power of 400-500W, and a treatment time of 20-30s; after treatment, nanoscale micropores with a pore size of 50-100nm are etched on the fiber surface, and hydroxyl and carboxyl active groups are introduced.

[0022] In a preferred embodiment of the present invention, the weft yarn is removed from impurities in step S2 using a complex system of cellulase and pectinase; wherein the mass ratio of cellulase to pectinase is 2-2.5:1, and the total concentration is 20-25 g / L; the treatment is performed with the assistance of ultrasound, the ultrasound frequency is 40 kHz, and the power is 300-400 W; the treatment conditions are: temperature 45-50°C, time 30-40 min, pH value 5.5-6.0, and yarn to solution mass ratio is 1:20-23.

[0023] In a preferred embodiment of the present invention, the specific parameters of the intelligent weaving in step S3 include:

[0024] The AI ​​tension control system uses a fiber optic tension sensor with an accuracy of ±0.1N and a sampling frequency of 80-2100Hz. It adjusts the warp let-off motor speed based on the LSTM dynamic tension prediction model to ensure that the warp tension fluctuation range is ≤±0.3N. The warp tension is 12-15N, and the face warp tension is 8-10N.

[0025] The magnetic suspension multi-shed weft insertion adopts electromagnetic suspension guide rails, with a suspension height of 0.5-1mm, a magnetic field strength of 0.1-0.2T, a weft insertion speed of 800-1000m / min, and a weft yarn density of 420-450 yarns / 10cm;

[0026] The parameters of the bionic sine wave structure optimized by the digital twin model are: curvature radius 8-12mm, angle gradient 38°-42°, increasing from the center to the edge of the fabric, warp spacing 2-3mm, and spatial coordinate expression is ,in, For amplitude, 2-3mm, For wavelength, 8-10mm, is the phase difference, 15°-20°.

[0027] In a preferred embodiment of the present invention, the parameters of supercritical CO2 dyeing and finishing in step S4 are: CO2 temperature 80-100°C, pressure 15-20 MPa, disperse dye dosage 2-3%, cycle time 60-80 min, and pressure relief rate 0.5-1 MPa / min.

[0028] In a preferred embodiment of the present invention, the parameters of the graphene nanosheet padding treatment in step S5 are: the graphene nanosheet has a sheet diameter of 50-100 nm and a concentration of 1-2 g / L; the dispersant is sodium dodecylbenzenesulfonate, the concentration is 0.5-1 g / L, and the Zeta potential is ≥-30 mV; the binder is water-based polyurethane, the concentration is 3-5 g / L; the suspension is prepared by ultrasonic dispersion at a frequency of 40 kHz, a power of 500 W, and a time of 20-30 min; the padding temperature is 25±2°C, the rolling rate is 60-70%, and the padding pressure is 0.3-0.5 MPa; the pre-baking temperature is 80-90°C, the time is 3-5 min, and the baking temperature is 120-130°C, and the time is 2-3 min.

[0029] The present invention provides a spandex-free stretch woven fabric: the fabric is collaboratively composed of warp yarns, face warp yarns and weft yarns, wherein the warp yarns are a longitudinal elastic support layer, the face warp yarns are a surface functional layer, and the weft yarns are a transverse moisture-absorbing elastic layer; the fabric has a bionic sinusoidal wave junction structure, a sinusoidal wave curvature radius of 8-12 mm, an angle gradient of 38°-42°, increasing from the center to the edge, and a junction warp yarn spacing of 2-3 mm; high color fastness is achieved through supercritical CO2 dyeing and finishing, and temperature-sensitive active elastic recovery is imparted through temperature-sensitive memory finishing, with a trigger temperature of 37±2°C; and antistatic and friction resistance are improved through graphene nanosheet loading.

[0030] The present invention solves the defects existing in the background technology and has the following beneficial effects:

[0031] (1) The present invention provides a spandex-free stretch woven fabric and its preparation method. Through the collaborative innovation of multi-scale material composite and intelligent process, the technical bottlenecks of traditional spandex-free stretch fabrics, such as insufficient elasticity, poor durability and low comfort, are solved. At the material level, graphene / nanosilica modified PBT / PTT composite fiber is used as the warp yarn to construct a "spring-damping" elastic structure; carbon nanotube-coated ultrafine denier nylon is used as the face warp yarn to reduce surface friction; and Yaser / PTT two-component core-spun yarn is used as the weft yarn to achieve synergistic transverse elasticity and moisture absorption and moisture conduction functions. At the process level, precision weaving is achieved through AI tension control system and magnetic suspension weft insertion technology, and the bionic sine wave structure is optimized by digital twin, so that the stress distribution of the fabric is more in line with the laws of human movement. Supercritical CO2 waterless dyeing and finishing technology is used to avoid fiber damage, and temperature-sensitive memory finishing is used to give the fabric a body temperature-triggered self-recovery function. Finally, the conductivity and wear resistance are improved through graphene nanosheet impregnation treatment; thus achieving an integrated breakthrough of high elasticity, high durability and intelligent response.

[0032] (2) The present invention adopts graphene / nanosilica modified PBT / PTT composite fiber as warp yarn, combines carbon nanotube coated nylon warp yarn and Yaser / PTT two-component core-spun weft yarn, and constructs a multi-level elastic network system. The multi-scale material composite design enables different fiber components to form complementary synergy in elasticity, strength and functional properties: the modified PBT / PTT fiber provides intrinsic elasticity through the "spring-damping" structure induced by graphene, and nanosilica enhances the interfacial bonding force; the carbon nanotube coating layer reduces the surface friction coefficient, and the PTT core layer of the core-spun weft yarn and the Yaser groove structure contribute to lateral elasticity and moisture absorption and moisture conduction functions respectively.

[0033] (3) The present invention introduces an intelligent weaving process that combines an AI tension control system with magnetic levitation weft insertion technology. By real-time monitoring and dynamic adjustment of warp tension, combined with contactless high-speed weft insertion, precise positioning and structural control of the yarn are achieved. The AI ​​system responds to the tension of multiple warp beams in milliseconds based on the LSTM algorithm, ensuring that the tension of each layer of warp yarn is stable in the optimal range during the weaving process; the magnetic levitation technology drives the weft insertion device with electromagnetic force, avoiding yarn wear caused by traditional mechanical weft insertion. Compared with the problems of yarn displacement or breakage caused by uneven tension in traditional weaving technology, this process improves the uniformity of fabric density, with a weft density of up to 450 yarns / 10 cm. Combined with the bionic sine wave binding structure optimized by digital twin technology, the stress distribution of the fabric during dynamic stretching is closer to the deformation law of human skin.

[0034] (4) The supercritical CO2 dyeing and finishing process used in this invention solves the problem of damage to elastic fibers caused by traditional dyeing and finishing technologies. Supercritical CO2 fluid delivers the dye directly to the amorphous region of the fiber without the need for a water medium, avoiding the molecular chain breakage caused by high-temperature and high-pressure water dyeing. Compared with existing dyeing and finishing processes, this technology improves dyeing uniformity while reducing fiber strength loss.

[0035] (5) The present invention constructs a three-dimensional conductive network on the surface of the fabric treated with graphene nanosheets, which solves the problems of poor anti-static performance and easy surface wear of traditional stretch fabrics; the graphene nanosheets form a continuous protective layer on the fiber surface through water-based polyurethane adhesive, which not only reduces the surface resistance of the fabric and achieves an anti-static effect, but its two-dimensional structure also significantly improves the sliding property between fibers. The graphene layer and the underlying carbon nanotube-coated warp yarn form a synergistic conductive path, which gives the fabric a preliminary strain sensing capability. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments described in the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive efforts.

[0037] Figure 1 is a flow chart of a preferred embodiment of the present invention;

[0038] Figure 2 is a flow chart of an intelligent weaving control system according to a preferred embodiment of the present invention;

[0039] Figure 3 is a functional synergy diagram of a preferred embodiment of the present invention;

[0040] Figure 4 This is a diagram showing the fabric composition of a preferred embodiment of the present invention;

[0041] Figure 5 This is a fabric structure diagram of a preferred embodiment of the present invention;

[0042] In the figure: 1, face warp yarn; 2, warp yarn; 3, binding warp yarn; 4, weft yarn. DETAILED DESCRIPTION

[0043] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention.

[0044] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0045] Application Overview:

[0046] The technical bottleneck of existing non-spandex stretch fabrics mainly stems from the lack of coordination between material selection and process design. From a material perspective, it is difficult for a single fiber to simultaneously meet the requirements of elasticity, strength, and durability, while the interface compatibility issues of composite fibers will affect performance stability. From a process perspective, traditional weaving technology cannot achieve precise control of yarns, resulting in low elastic recovery rate; the high temperature and high pressure environment of the dyeing and finishing process can easily damage the molecular structure of elastic fibers, exacerbating performance degradation. In addition, existing technologies lack the ability to regulate the microscopic deformation mechanism of fibers, making it impossible to achieve biomimetic elasticity through structural design, while ignoring the potential of smart materials in dynamic response.

[0047] like Figure 3 As shown, this application proposes a spandex-free stretch woven fabric and its preparation method, which solves the above-mentioned problems through the collaborative combination of multi-scale material composites and intelligent processes. At the material level, graphene / nanosilica modified PBT / PTT fibers are used as warp yarns, combined with carbon nanotube-coated nylon and two-component core-spun weft yarns to construct a multi-level elastic network; at the process level, AI tension control and magnetic levitation weft insertion technology are introduced to achieve precise yarn weaving, and the bionic structure is optimized through digital twins. Supercritical CO2 dyeing and finishing technology avoids the defects of traditional processes, and the graphene nanosheet padding treatment further improves the conductivity and durability of the fabric.

[0048] Exemplary methods:

[0049] like Figure 1 As shown, a method for preparing a non-spandex elastic woven fabric comprises the following steps:

[0050] S1. Prepare warp yarn, face warp yarn and weft yarn, wherein the warp yarn is prepared by blending graphene and nano-silica modified PBT / PTT fiber and blending shape memory polymer staple fiber; the face warp yarn is prepared by ultrafine denier nylon coated with carbon nanotubes; and the weft yarn is prepared by Yaser and PTT bicomponent core-spun yarn;

[0051] S2. Pre-treating the warp yarn and the weft yarn, wherein the warp yarn is activated and the weft yarn is cleaned;

[0052] S3. Intelligently weave the warp and weft yarns to form a base fabric with a bionic sinusoidal binding structure. The bionic sinusoidal binding structure is a continuous curvature binding path that simulates the bending curvature and motion stress distribution of human joints. Intelligent weaving dynamically adjusts the warp tension through an AI tension control system, while using magnetic levitation multi-shed weft insertion to increase weft density. The warp binding path is then optimized based on a digital twin model to form a bionic sinusoidal structure.

[0053] S4, supercritical CO2 dyeing and finishing of base fabrics;

[0054] S5. The dyed fabric is treated by graphene nanosheet padding to obtain a spandex-free stretch woven fabric.

[0055] like Figure 4 As shown, the warp yarns are arranged along the longitudinal direction of the fabric, that is, the length direction, and are mainly responsible for the structural support and longitudinal elasticity of the fabric; the face warp yarns are located on the surface of the fabric, responsible for the surface touch, friction resistance, and appearance density; the weft yarns are arranged along the transverse direction of the fabric, that is, the width direction, and are responsible for the transverse elasticity, moisture absorption and comfort, and structural filling functions. This application uses an intelligent weaving process to achieve a three-layer structure coordinated weaving.

[0056] In step S1, warp yarn preparation includes:

[0057] PBT / PTT chips are blended with graphene masterbatch and nano-silica to form composite filaments through a twin-screw spinning machine;

[0058] The composite filaments are blended with the shape memory polymer staple fibers through a drawing frame to form a blended yarn;

[0059] The blended yarn is subjected to multi-stage drafting treatment to optimize the fiber crystallinity and orientation, and finally a modified composite warp yarn with uniform diameter is produced.

[0060] Among them, PBT is polybutylene terephthalate, PTT is polypropylene terephthalate, and the mass ratio is 1-1.3:1;

[0061] The flake diameter of graphene masterbatch is 50-100nm, accounting for 0.3-0.5%, and the particle size of nano-silicon dioxide is 20-30nm, accounting for 0.1-0.3%;

[0062] The shape memory polymer staple fiber is SMP, with a length of 38-51 mm, accounting for 10% of the total warp yarn;

[0063] PBT / PTT chips are melted at 260-270°C; graphene masterbatch, nano-silica and molten PBT / PTT are thoroughly mixed for 15-20 minutes at a speed of 300-400 rpm; graphene induces the molecular chain to form a "spring-damper" dual-phase structure, and nano-silica enhances the surface roughness of the fiber;

[0064] The twin-screw spinning machine has a screw diameter of Φ45mm, an aspect ratio L / D=32:1, a spinning nozzle aperture of 0.2-0.25mm, and a spinneret hole number of 24-36 holes, and outputs composite filaments;

[0065] The modified PBT / PTT filaments are blended with SMP staple fibers through a drawing frame with a drawing number of 6-8 strands, a roller gauge of 32-35mm, and a delivery speed of 40-45m / min to form a warp yarn with both elastic recovery and rapid recovery properties;

[0066] Drafting treatment includes:

[0067] The primary drawing temperature is 80-85°C, the drawing ratio is 3.5-3.7:1; the secondary drawing temperature is 120-125°C, the drawing ratio is 1.2-1.5:1; the winding speed is 3500-3800 m / min, and the modified PBT / PTT composite fiber is obtained;

[0068] The warp yarn serves as the core of the elastic support layer, providing longitudinal elasticity and structural support, and the elastic origin is enhanced by composite modified fibers.

[0069] In step S1, the face warp yarn preparation includes:

[0070] Ultra-fine denier nylon filament is used as the base material and the surface oil is removed by alkali pretreatment;

[0071] Under argon protection, carbon nanotubes are uniformly loaded on the surface of nylon fibers using chemical vapor deposition to form a functional coating.

[0072] The ultra-fine nylon filament has a denier of 0.4-0.6D and a single filament diameter of 10-20μm. The carbon nanotubes have a diameter of 10-20nm and a purity of ≥95%. The dispersant is sodium lauryl sulfate at a concentration of 0.5-0.6%; the alkali solution is 5% NaOH solution. The ultra-fine denier structure enhances surface coverage and makes the fabric surface smoother.

[0073] Using chemical vapor deposition equipment, the quartz tube diameter is Φ80-100mm, and the heating zone length is 250-300mm;

[0074] Ultrafine denier nylon filaments were treated in 5% NaOH solution at 60°C for 10 min to remove surface oil;

[0075] The argon flow rate is 400-500sccm, the carbon source is methane CH4, with a flow rate of 80-100sccm; the reaction temperature is 600-650℃ to avoid high-temperature degradation of nylon, the coating time is 10-15min, and the carbon nanotube loading is 0.1-0.15%. Carbon nanotubes reduce the surface friction coefficient of the fiber and improve tensile flexibility.

[0076] The surface warp yarn serves as the surface functional layer to improve the surface friction resistance, tensile flexibility and density.

[0077] In step S1, weft yarn preparation includes:

[0078] PTT staple fiber is used as the core layer to provide basic elasticity, and the outer layer uses Yassel staple fiber with a groove structure to enhance moisture absorption and moisture conduction performance; the PTT core yarn is centered through the ring spinning machine, and the Yassel staple fiber is evenly covered on the surface of the core yarn by the drafting roller to form a tight core-wrapped structure; the PTT core layer gives the weft yarn transverse elasticity, and the Yassel outer layer quickly conducts moisture through the groove structure. At the same time, the core-wrapped structure reduces fiber friction damage and improves fatigue resistance.

[0079] The PTT staple fibers are 35-40mm long, while the Yassel staple fibers have a grooved structure and are 35-40mm long with a mass ratio of 1:2.2-2.4. The ring spinning machine spindle speed is 15,000-16,000 rpm, and the PTT core yarn tension is 3-5 cN. The Yassel staple fibers are evenly wrapped around the core yarn using drafting rollers, with a back draft of 1.2-1.3 times and a twist of 101.3-105.6 twists / 10cm to ensure tight coverage. The PTT core layer provides basic lateral elasticity, while the grooved structure of the Yassel outer layer enhances moisture absorption and moisture conduction. The core wrapping structure prevents direct exposure of the PTT, reducing friction damage.

[0080] The weft yarn acts as a moisture-absorbing elastic layer, providing lateral elasticity and moisture absorption and conduction properties, thereby improving wearing comfort.

[0081] Step S1 achieves differentiated functional synergy of warp yarn, face warp yarn and weft yarn through the triple design of modified fiber, functional coating and core-spun structure, laying the foundation for the high elasticity and comfort of spandex-free stretch fabric.

[0082] In step S2, the warp yarn is surface activated to enhance the binding force between the warp yarn and the finishing agent, thereby reducing end breakage during weaving and optimizing the fiber surface polarity to enhance the penetration effect of subsequent functional finishing;

[0083] Using atmospheric pressure low-temperature plasma technology and argon-oxygen mixed gas as the medium, the surfaces of PBT / PTT composite fibers and ultrafine denier nylon mixed warp yarns are modified by bombardment with high-energy particles; the plasma etches nanoscale micropores on the fiber surface and introduces active groups such as hydroxyl (-OH) and carboxyl (-COOH) to enhance the polarity of the fiber surface.

[0084] Among them, it is processed by a normal pressure low-temperature plasma generator, using a radio frequency power supply with a frequency of 13-14MHz; a mixed gas of argon and oxygen with a volume ratio of 3-3.5:1 and a total flow rate of 200-300sccm; processing parameters: power of 400-500W to avoid high power damage to the fiber structure, time of 20-30s, completing surface etching and group introduction in a short time.

[0085] The high-energy particles in the plasma bombard the fiber surface, etching nanoscale micropores with a pore size of 50-100nm. At the same time, Ar / O2 is dissociated into active groups and grafted onto the fiber surface; the polarity of the fiber surface increases, the contact angle decreases, and the wettability improves.

[0086] In step S2, impurities on the weft yarn surface, such as pectin and hemicellulose of Yassel fiber and spinning oil of PTT fiber, are removed to prevent impurities from forming pills or clogging the yarn guide during weaving, while improving the penetration uniformity of the dye in the subsequent dyeing and finishing process.

[0087] A complex system of cellulase and pectinase is used to hydrolyze the surface of the Yassel / PTT core-spun yarn to remove the pectin and amorphous cellulose on the outer layer of the Yassel fiber while avoiding damage to the PTT core layer structure. Ultrasonic vibrations are introduced during the enzymatic hydrolysis process to accelerate the penetration of enzyme molecules into the fiber through the cavitation effect, stripping off the decomposed impurity particles and preventing them from redepositing.

[0088] Among them, the composite biological enzymes are cellulase and pectinase, with a mass ratio of 2-2.5:1 and a total concentration of 20-25g / L; the ultrasonic frequency is 40kHz and the power is 300-400W, which enhances the diffusion of enzyme molecules and fiber penetration; the treatment conditions are: temperature 45-50℃, time 30-40min, pH value 5.5-6.0, and yarn to solution mass ratio of 1:20-23; cellulase selectively hydrolyzes the amorphous cellulose on the surface of Yassel fiber, and pectinase decomposes the pectin in Yassel fiber to reduce inter-fiber adhesion; the ultrasonic cavitation effect generates microjets, which accelerate the penetration of enzyme molecules into the fiber and strip off the decomposed impurities at the same time.

[0089] like Figure 2 As shown, in step S3, intelligent weaving achieves precise positioning of yarns and construction of bionic elastic structures through the collaboration of three technologies: AI dynamic tension control, magnetic levitation multi-shed weft insertion, and digital twin model optimization of the splicing path. This solves the problems of traditional weaving technology that cannot accurately control yarns and have low elastic recovery rate.

[0090] Dynamic tension control ensures uniform tension of each layer of warp yarn during weaving by real-time monitoring and adjusting the tension of different types of warp yarns, thus avoiding structural deformation or elasticity loss caused by tension fluctuations.

[0091] The AI ​​multi-beam let-off device integrates a fiber optic tension sensor with an accuracy of ±0.1N. It uses an LSTM-based dynamic tension prediction model that inputs real-time tension data with a sampling frequency of 80-2100Hz and outputs let-off motor speed adjustment instructions to ensure a tension fluctuation range of ≤±0.3N.

[0092] The warp yarn bears longitudinal elasticity and structural support, with a tension of 12-15N;

[0093] The surface warp yarn is the surface functional layer with a tension of 8-10N to avoid excessive stretching that affects surface smoothness.

[0094] Magnetic suspension multi-shed weft insertion technology reduces weft yarn wear through contactless weft insertion, increases weft yarn density, and enhances transverse elasticity and structural density;

[0095] The magnetic levitation multi-shed loom adopts electromagnetic levitation guide rails, with a levitation height of 0.5-1mm, a weft insertion speed of 800-1000m / min, a weft yarn density of 420-450 yarns / 10cm, and a levitation magnetic field strength of 0.1-0.2T.

[0096] The magnetic suspension weft inserter moves in suspension through electromagnetic force, has no mechanical contact with the yarn guide, and reduces the wear rate of the weft yarn.

[0097] like Figure 5 As shown, the digital twin model optimizes the path of the binding warp yarns based on fiber deformation simulation, forming a bionic sine wave structure and improving the dynamic elastic adaptability of the fabric. The binding warp yarn is a special warp yarn system whose core function is to pass through the multi-layer fabric through a specific path, physically connecting the separated yarn layers, the surface warp yarn layer, the weft yarn layer, and the bottom warp yarn into a whole. In the bionic sine wave structure of this application, the binding warp yarn is a key technical element in constructing a three-dimensional elastic network, and the material is consistent with the warp yarn.

[0098] The binding warp yarns of the present application penetrate the three layers with a wavy line of a sinusoidal wave path, achieving dynamic coupling of the three layers, including:

[0099] The curvature radius of the sine wave is 8-12mm, simulating the curvature of the human joint when it bends;

[0100] The angle gradient is 38°-42°, increasing from the center of the fabric to the edge, matching the stress distribution during human movement;

[0101] The spacing between the warp yarns is 2-3mm to ensure that the elastic support points are evenly distributed;

[0102] The spatial coordinates of the connection path are expressed as ,in, is the amplitude, 2-3mm, corresponding to the curvature radius, is the wavelength, 8-10mm, corresponding to the weft density, Phase difference, 15°-20°, gradient distribution to achieve angle;

[0103] The bionic sine wave structure ensures uniform stress distribution of the fabric when stretched, improving its elastic recovery rate.

[0104] The joining paths of traditional woven fabrics are mostly straight lines or simple broken lines, which causes stress to concentrate at the joining points during stretching, easily causing elastic fiber breakage or plastic deformation; this application adopts a bionic sinusoidal wave structure, and the continuous curvature change of the sine wave is highly consistent with the skin deformation trajectory when the human joints bend. The fabric can stretch naturally with the limbs during exercise, reducing the sense of restraint; the gradient curvature of the sinusoidal wave path makes the tensile stress evenly distributed along the curve, avoiding excessive local stress.

[0105] In step S4, supercritical CO2 dyeing and finishing is used to solve the damage problem of elastic fibers caused by traditional water dyeing process, and finally achieve comprehensive performance improvement of high color fastness and low damage.

[0106] Supercritical CO2 (SC-CO2) refers to a CO2 fluid whose temperature and pressure exceed the critical point (31.1°C, 7.38 MPa). It combines the diffusivity of a gas with the solubility of a liquid, serving as an environmentally friendly alternative to traditional water-based dyeing. This process uses SC-CO2 to dissolve disperse dyes, allowing them to penetrate the fiber and complete the dyeing process, thus avoiding the damage to the molecular chains of PBT / PTT composite fibers caused by high-temperature and high-pressure water-based dyeing.

[0107] The high-pressure supercritical dyeing and finishing kettle has a volume of 45-50L, a temperature resistance of 200℃, and a pressure resistance of 30MPa; the CO2 temperature is 80-100℃, the pressure is 15-20MPa, the dye type is disperse dye, and the dosage is 2-3%; the cycle time is 60-80min to ensure that the dye fully penetrates into the fiber. After the end, the pressure relief rate is 0.5-1MPa / min, and the pressure is slowly relieved to avoid microcracks inside the fiber.

[0108] The supercritical CO2 dyeing and finishing process uses CO2 fluid in a supercritical state to replace the traditional water medium. Through its characteristics of both gas diffusivity and liquid solubility, it can efficiently penetrate disperse dyes into the interior of PBT / PTT composite fibers to achieve waterless dyeing, avoiding thermal damage to the fiber molecular chains caused by high temperature and high pressure, while ensuring that the dye is evenly distributed in the amorphous area of ​​the fiber to improve color fastness.

[0109] In step S5, the uniform loading of graphene nanosheets gives the fabric high conductivity, antistatic properties and friction resistance, solving the problem of weak antistatic ability and easy wear after long-term use of traditional stretch fabrics due to the lack of spandex.

[0110] Prepare the finishing liquid by adding graphene nanosheets, dispersant, and binder to deionized water in proportion, and process through an ultrasonic disperser at a frequency of 40 kHz and a power of 500 W for 20-30 minutes to form a stable suspension;

[0111] The diameter of the graphene nanosheets is 50-100nm, matching the size of the graphene masterbatch used for warp yarn modification in S1 to enhance interfacial bonding. The concentration is 1-2g / L to ensure a moderate loading and avoid excessive impact on the feel.

[0112] The dispersant used is sodium dodecylbenzenesulfonate with a concentration of 0.5-1g / L, which prevents graphene agglomeration through electrostatic repulsion and has a Zeta potential of ≥-30mV;

[0113] The adhesive uses water-based polyurethane with a concentration of 3-5g / L to improve the bonding strength between graphene and fiber, with a peel strength of ≥0.6N / cm;

[0114] The solvent used was water.

[0115] Through immersion and rolling, graphene nanosheets are evenly attached to the surface of the fabric and the gaps between fibers. The immersion and rolling temperature is 25±2°C to prevent the dispersion from failing due to high temperature. The rolling rate is 60-70% to control the graphene loading. Excess will reduce elasticity, while insufficient will weaken the function. The rolling pressure is 0.3-0.5MPa to ensure that the suspension fully penetrates into the fabric, especially the interweaving points of the warp and weft yarns.

[0116] Pre-baking and baking solidify the film, remove moisture and solidify the graphene / adhesive film layer to improve the bonding strength; the pre-baking temperature is 80-90℃, the time is 3-5 minutes, and the temperature is slowly increased to avoid rapid evaporation of moisture and cause graphene agglomeration; the baking temperature is 120-130℃, the time is 2-3 minutes, which triggers the cross-linking reaction of water-based polyurethane to form a stable film layer.

[0117] Example 1:

[0118] A method for preparing a spandex-free stretch woven fabric comprises the following steps:

[0119] S1. Prepare warp yarn, face warp yarn and weft yarn, wherein the warp yarn is prepared by melting PBT / PTT chips with a mass ratio of 1.2:1, graphene masterbatch with a sheet diameter of 75nm and a proportion of 0.4%, and nano-silicon dioxide with a particle size of 25nm and a proportion of 0.2%, and extruding the composite filaments through a twin-screw spinning machine at 265°C. The spinning machine screw diameter is Φ45mm, the aspect ratio L / D=32:1, the spinning nozzle aperture is 0.22mm, and the number of spinneret holes is 0. 30 holes; the composite filaments and the shape memory polymer staple fibers with a length of 45 mm, accounting for 10% of the total warp yarn, are blended by a drawing frame, with a drawing number of 7, a roller spacing of 34 mm, and a delivery speed of 42 m / min to form a blended yarn; the blended yarn is subjected to a multi-stage drawing treatment, with a first-stage drawing temperature of 82°C, a drawing ratio of 3.6:1, a second-stage drawing temperature of 122°C, a drawing ratio of 1.3:1, and a winding speed of 3650 m / min to obtain a modified composite warp yarn; the face warp yarn Ultrafine nylon filaments with a denier of 0.5D and a single filament diameter of 15 μm were selected as the substrate and treated in a 5% NaOH solution at 60°C for 10 min to remove the surface oil agent. Carbon nanotubes with a diameter of 15 nm and a purity of 98% were uniformly loaded on the surface of the nylon fiber under chemical vapor deposition conditions of an argon flow rate of 450 sccm, a methane flow rate of 90 sccm, and a reaction temperature of 620°C. The dispersant used was sodium dodecyl sulfate with a concentration of 0.55% and a carbon nanotube loading of 0.12%, forming a functional coating. The weft yarn was made of a 38 mm long PTT staple fiber as the core layer and a 38 mm long grooved Yassel staple fiber as the outer layer. The mass ratio was 1:2.3. The Yassel staple fiber was evenly coated on the core yarn surface using a ring spinning frame at a spindle speed of 15,500 rpm, a PTT core yarn tension of 4 cN, a back zone draft of 1.25 times, and a twist of 103.5 twists / 10 cm to form a compact core-spun structure.

[0120] S2. Pre-treating the warp and weft yarns: the warp yarns were treated with atmospheric-pressure low-temperature plasma technology using an argon-oxygen mixed gas with a volume ratio of 3.2:1 as the medium, and a plasma generator with a radio frequency power supply frequency of 13.5 MHz and a power of 450 W for 25 seconds to etch nanoscale micropores with a pore size of 75 nm on the fiber surface, and active groups such as hydroxyl and carboxyl groups were introduced; the weft yarns were treated with a cellulase and pectinase complex system with a mass ratio of 2.3:1 and a total concentration of 22 g / L at a temperature of 48° C., a pH value of 5.8, an ultrasonic frequency of 40 kHz, and a power of 350 W for 35 minutes to remove pectin and amorphous cellulose from the Yaser fiber and the spinning oil from the PTT fiber;

[0121] S3. Intelligent weaving of warp and weft yarns to form the base fabric. The intelligent weaving system dynamically adjusts the warp tension through an AI tension control system, achieving a warp tension of 13.5N and a face warp tension of 9N. Utilizing magnetic levitation multi-shed weft insertion technology, the system achieves a suspension height of 0.8mm, a weft insertion speed of 900m / min, a weft density of 435 yarns / 10cm, and a suspension magnetic field strength of 0.15T. The digital twin model is then used to optimize the warp yarn path, resulting in a bionic sinusoidal wave structure with a sinusoidal curvature radius of 10mm, an angle gradient of 40°, and a warp yarn spacing of 2.5mm.

[0122] S4. Perform supercritical CO2 dyeing and finishing on the base fabric, circulating for 70 minutes under the conditions of CO2 temperature 90°C, pressure 18 MPa, disperse dye dosage 2.5%, and pressure relief rate 0.8 MPa / min;

[0123] S5. The dyed fabric is treated by graphene nanosheet padding. Graphene nanosheets with a sheet diameter of 75 nm and a concentration of 1.5 g / L, a sodium dodecylbenzenesulfonate dispersant with a concentration of 0.8 g / L, and an aqueous polyurethane adhesive with a concentration of 4 g / L are added to deionized water, and treated with an ultrasonic disperser at a frequency of 40 kHz and a power of 500 W for 25 min to form a stable suspension. Under the conditions of a padding temperature of 25°C, a rolling rate of 65%, and a padding pressure of 0.4 MPa, the graphene nanosheets are uniformly attached to the fabric surface and the fiber gaps. The fabric is then cured into a film at a pre-baking temperature of 85°C for 4 min and a baking temperature of 125°C for 2.5 min to obtain a spandex-free stretch woven fabric.

[0124] Example 2:

[0125] A method for preparing a spandex-free stretch woven fabric is provided. The same aspects as those of Example 1 will not be described in detail, except that the mass ratio of PBT / PTT is 1:1.

[0126] Example 3:

[0127] A method for preparing a spandex-free stretch woven fabric is described. The same aspects as those of Example 1 are omitted here. The difference lies in that the mass ratio of PBT / PTT is 1.1:1.

[0128] Example 4:

[0129] A method for preparing a spandex-free stretch woven fabric is described. The same aspects as those of Example 1 are omitted here. The difference lies in that the mass ratio of PBT / PTT is 1.3:1.

[0130] Embodiment 5:

[0131] A method for preparing a spandex-free stretch woven fabric is described in detail below. The method is similar to the first embodiment, except that the proportion of graphene masterbatch is 0.3%.

[0132] Example 6:

[0133] A method for preparing a spandex-free stretch woven fabric is similar to Example 2 and will not be repeated here. The difference is that the proportion of graphene masterbatch is 0.3%.

[0134] Embodiment seven:

[0135] A method for preparing a spandex-free stretch woven fabric is similar to Example 3 and will not be repeated here. The difference is that the proportion of graphene masterbatch is 0.3%.

[0136] Embodiment 8:

[0137] A method for preparing a spandex-free stretch woven fabric is similar to Example 4 and will not be repeated here. The difference is that the proportion of graphene masterbatch is 0.3%.

[0138] Embodiment 9:

[0139] A method for preparing a spandex-free stretch woven fabric is described. The same points as those in Example 1 are not repeated here, except that the proportion of graphene masterbatch is 0.5%.

[0140] Embodiment 10:

[0141] A method for preparing a spandex-free stretch woven fabric is described in detail below. The method is similar to the second embodiment, except that the proportion of graphene masterbatch is 0.5%.

[0142] Example 11:

[0143] A method for preparing a spandex-free stretch woven fabric is similar to Example 3 and will not be repeated here. The difference is that the proportion of graphene masterbatch is 0.5%.

[0144] Example 12:

[0145] A method for preparing a spandex-free stretch woven fabric is similar to Example 4 and will not be repeated here. The difference is that the proportion of graphene masterbatch is 0.5%.

[0146] Example 13:

[0147] A method for preparing a spandex-free elastic woven fabric is described. The same aspects as those of Example 1 are omitted here. The difference is that the angle gradient is 38°.

[0148] Example 14:

[0149] A method for preparing a non-spandex elastic woven fabric is described. The same points as those in Example 1 are not repeated here. The difference is that the angle gradient is 42°.

[0150] Comparative Example 1:

[0151] A method for preparing a spandex-free stretch woven fabric is described in detail below. The method is similar to the first embodiment, except that the proportion of graphene masterbatch is 0.

[0152] Experiment 1:

[0153] This experiment uses Examples 1 to 12 and Comparative Example 1 to conduct experiments to verify the elasticity and recovery ability of the fabric:

[0154] Determine the elongation recovery rate according to ASTM D3107 test;

[0155] Perform 1000 cycles of tensile testing according to ISO 13934-1 and calculate the elasticity loss rate;

[0156] Test surface resistance according to ASTM D257;

[0157] Table 1 Experimental parameters designed for Examples 1 to 12 and Comparative Example 1

[0158]

[0159] The core reason why Example 1 has the best effect is that the synergistic effect of its key parameters and the elasticity and antistatic properties of the material achieve an optimal balance.

[0160] From an analysis of elastic mechanisms, the differences in the molecular chain structures of PBT (polybutylene terephthalate) and PTT (polytrimethylene terephthalate) determine their functional complementarity: PBT's rigid benzene ring structure provides skeletal support for the molecular chain, inhibiting excessive deformation; while PTT's flexible propylene glycol segments store elastic potential energy through a helical-to-straightened conformational transition. When the PBT / PTT mass ratio is 1.2:1, the ratio of rigid to flexible segments reaches a critical equilibrium. This avoids both the excessive hardness caused by a high PBT ratio (e.g., the decreased elastic recovery at a ratio of 1:1 in Example 2) and the increased molecular chain slip caused by a high PTT ratio (e.g., the slightly increased elastic loss at a ratio of 1.3:1 in Example 4). Consequently, the material can efficiently store and release elastic potential energy during stretching, exhibiting the highest elastic recovery and lowest elastic loss.

[0161] From the perspective of antistatic and elastic enhancement, a 0.4% graphene masterbatch percentage is its critical dispersion threshold in the PBT / PTT matrix: graphene's high conductivity can form a continuous conductive network within the fiber, effectively reducing charge accumulation; at the same time, its nanosheet structure is embedded between the PBT / PTT molecular chains through a "mechanical locking" effect, forming a "spring-damping" two-phase structure - the graphene sheets act as "micro-springs" to enhance elastic recovery, while the interfacial friction with the matrix acts as a "damping" to suppress energy dissipation during cyclic stretching (minimal elastic loss rate). If the graphene percentage is less than 0.4%, the conductive network and mechanical locking effects are insufficient, and the surface resistance and elastic loss rate both increase; if it is higher than 0.4%, the graphene easily agglomerates to form defects, which in turn destroys the continuity of the molecular chain and leads to performance degradation.

[0162] In summary, Example 1 achieves the optimal match of elasticity and antistatic properties through the precise control of the PBT / PTT ratio and the synergistic effect of the critical filling amount of graphene, so it performs best in the experiment.

[0163] Experiment 2:

[0164] This experiment uses Example 1, Example 13 to Example 14 to conduct experiments to verify the elasticity and recovery ability of the fabric:

[0165] Simulate the elastic recovery rate of human joints after bending 1000 times;

[0166] Simulates the elastic loss rate of human joints after bending 1000 times;

[0167] Table 2 Experimental parameters designed for Example 1, Example 13 to Example 14

[0168]

[0169] The core reason why the first embodiment has the best effect is that its angle gradient achieves the best match with the stress distribution of the material's elastic deformation and the structural stability.

[0170] Based on the analysis of the principles of elastic deformation, the elastic recovery rate of the material and the energy loss rate during cyclic stretching are directly related to the deformation-recovery mechanism of its microstructure when subjected to stress. The angle gradient determines the degree of stress dispersion and concentration of the material during stretching: when the angle gradient is 40°, the fiber / molecular chain orientation within the material forms an optimal angle with the stretching direction - avoiding both the increase in inter-fiber friction caused by too small an angle and the expansion of the stress concentration area caused by too large an angle. This critical angle allows the deformation energy during stretching to be evenly distributed throughout the material, allowing the molecular chains or fibers to efficiently undergo reversible "stretch-contraction" deformation, with the highest efficiency in elastic potential energy storage and release, and the lowest energy dissipation during cyclic stretching.

[0171] Angle gradients that deviate from 40° disrupt this stress balance: at 38°, the contact area between fibers increases, generating frictional heat and causing more energy to be lost as heat. At 42°, some fibers are at excessive angles to the stretching direction, making irreversible plastic deformation more likely to occur in localized areas. Therefore, the 40° angle gradient of Example 1 achieves the highest elastic recovery and lowest cyclic stretching energy loss by optimizing the synergy between stress distribution and structural deformation, resulting in optimal performance.

[0172] The above description is based on the ideal embodiment of the present invention. Based on the above description, relevant personnel can make various changes and modifications without departing from the technical scope of this invention. The technical scope of this invention is not limited to the content of the specification and must be determined according to the scope of the claims.

Claims

1. A method for preparing a non-spandex elastic woven fabric, It is characterized by including: S1. Prepare warp yarn, face warp yarn and weft yarn, wherein the warp yarn is prepared by blending graphene and nano-silica modified PBT / PTT fiber and blending shape memory polymer staple fiber; the face warp yarn is prepared by ultrafine denier nylon coated with carbon nanotubes; and the weft yarn is prepared by Yaser and PTT bicomponent core-spun yarn; S2. Pre-treating the warp yarn and the weft yarn, wherein the warp yarn is activated and the weft yarn is cleaned; S3. Intelligently weaving the warp and weft yarns to form a base fabric having a bionic sinusoidal wave binding structure, wherein the bionic sinusoidal wave binding structure is a continuous curvature binding path that simulates the bending curvature and motion stress distribution of human joints; S4, supercritical CO2 dyeing and finishing of base fabrics; S5, treating the dyed fabric with graphene nanosheets to obtain a spandex-free stretch woven fabric; The specific parameters of the intelligent weaving in step S3 include: The AI ​​tension control system uses a fiber optic tension sensor with an accuracy of ±0.1N and a sampling frequency of 80-2100Hz. It adjusts the warp let-off motor speed based on the LSTM dynamic tension prediction model to ensure that the warp tension fluctuation range is ≤±0.3N. The warp tension is 12-15N, and the face warp tension is 8-10N. The magnetic suspension multi-shed weft insertion adopts electromagnetic suspension guide rails, with a suspension height of 0.5-1mm, a magnetic field strength of 0.1-0.2T, a weft insertion speed of 800-1000m / min, and a weft yarn density of 420-450 yarns / 10cm; The parameters of the bionic sine wave structure optimized by the digital twin model are: curvature radius 8-12mm, angle gradient 38°-42°, increasing from the center to the edge, warp spacing 2-3mm, and spatial coordinate expression is ,in, For amplitude, 2-3mm, For wavelength, 8-10mm, is the phase difference, 15°-20°.

2. The method for preparing a non-spandex elastic woven fabric according to claim 1, characterized in that: The preparation of the warp yarn in step S1 includes the following sub-steps: PBT / PTT chips are blended and melted with graphene masterbatch and nano-silica, and extruded through a twin-screw spinning machine to form composite filaments; wherein the mass ratio of PBT to PTT is 1-1.3:1, the flake diameter of the graphene masterbatch is 50-100 nm and the proportion is 0.3-0.5%, the particle size of the nano-silica is 20-30 nm and the proportion is 0.1-0.3%, the melting temperature of the PBT / PTT chips is 260-270°C, the mixing time is 15-20 min, and the rotation speed is 300-400 rpm; the screw diameter of the twin-screw spinning machine is Φ45 mm, the aspect ratio L / D=32:1, the spinning nozzle aperture is 0.2-0.25 mm, and the number of spinneret holes is 24-36 holes; The composite filaments are blended with shape memory polymer staple fibers through a drawing frame to form a blended yarn; wherein the SMP has a length of 38-51 mm and accounts for 10% of the total warp yarns, the number of doublings is 6-8, the roller gauge is 32-35 mm, and the delivery speed is 40-45 m / min; The blended yarn is subjected to multi-stage drawing treatment to obtain a modified composite warp yarn; wherein, the first-stage drawing temperature is 80-85°C, the drawing ratio is 3.5-3.7:1; the second-stage drawing temperature is 120-125°C, the drawing ratio is 1.2-1.5:1; and the winding speed is 3500-3800 m / min.

3. The method for preparing a spandex-free stretch woven fabric according to claim 1, wherein: The preparation of the face warp yarn in step S1 includes the following sub-steps: Ultrafine denier nylon filaments were used as the substrate and pretreated with 5% NaOH solution to remove the surface oil. The denier of the ultrafine denier nylon filaments was 0.4-0.6D, the diameter of the single filament was 10-20 μm, the pretreatment temperature was 60°C, and the treatment time was 10 minutes. Under argon protection, chemical vapor deposition is used to uniformly load carbon nanotubes on the surface of nylon fibers to form a functional coating; the argon flow rate is 400-500sccm, the carbon source is methane with a flow rate of 80-100sccm, the reaction temperature is 600-650℃, and the coating time is 10-15min; the diameter of the quartz tube of the chemical vapor deposition device is Φ80-100mm, and the length of the heating zone is 250-300mm; the diameter of the carbon nanotubes is 10-20nm, the purity is ≥95%, and the loading amount is 0.1-0.15%.

4. The method for preparing a non-spandex elastic woven fabric according to claim 1, wherein: The preparation of the weft yarn in step S1 includes the following sub-steps: PTT staple fiber is used as the core layer, and the outer layer is selected from Yassel staple fiber with a groove structure. The Yassel staple fiber is evenly covered on the surface of the PTT core yarn through a ring spinning frame to form a two-component core-spun yarn; among them, the length of the PTT staple fiber and the Yassel staple fiber are both 35-40mm, and the mass ratio of PTT to Yassel is 1:2.2-2.4; the spindle speed of the ring spinning frame is 15000-16000rpm, the tension of the PTT core yarn is 3-5cN, the back zone drafting multiple is 1.2-1.3 times, and the twist is 101.3-105.6 twists / 10cm.

5. The method for preparing a non-spandex elastic woven fabric according to claim 1, wherein: In step S2, the activation treatment of the warp yarn adopts atmospheric pressure low-temperature plasma technology, with an argon-oxygen mixed gas as the medium; wherein the volume ratio of argon to oxygen is 3-3.5:1, and the total flow rate is 200-300 sccm; radio frequency power supply is used for treatment, with a frequency of 13-14 MHz, a power of 400-500 W, and a treatment time of 20-30 s; after treatment, nano-scale micropores with a pore size of 50-100 nm are etched on the fiber surface, and hydroxyl and carboxyl active groups are introduced.

6. The method for preparing a spandex-free stretch woven fabric according to claim 1, wherein: In step S2, the weft yarn is treated for impurity removal using a complex system of cellulase and pectinase; wherein the mass ratio of cellulase to pectinase is 2-2.5:1, and the total concentration is 20-25 g / L; the treatment is performed with the assistance of ultrasound, the ultrasonic frequency is 40 kHz, and the power is 300-400 W; the treatment conditions are: temperature 45-50°C, time 30-40 min, pH value 5.5-6.0, and yarn to solution mass ratio is 1:20-23.

7. The method for preparing a spandex-free stretch woven fabric according to claim 1, wherein: The parameters of supercritical CO2 dyeing and finishing in step S4 are: CO2 temperature 80-100°C, pressure 15-20 MPa, disperse dye dosage 2-3%, cycle time 60-80 min, and pressure relief rate 0.5-1 MPa / min.

8. The method for preparing a non-spandex elastic woven fabric according to claim 1, characterized in that: The parameters for the graphene nanosheet padding treatment in step S5 are as follows: the graphene nanosheet has a sheet diameter of 50-100 nm and a concentration of 1-2 g / L; the dispersant is sodium dodecylbenzenesulfonate with a concentration of 0.5-1 g / L and a zeta potential of ≥-30 mV; the binder is water-based polyurethane with a concentration of 3-5 g / L; the suspension is prepared by ultrasonic dispersion at a frequency of 40 kHz, a power of 500 W, and a time of 20-30 min; the padding temperature is 25±2° C., the rolling rate is 60-70%, and the padding pressure is 0.3-0.5 MPa; the pre-baking temperature is 80-90° C., the time is 3-5 min, and the baking temperature is 120-130° C., and the time is 2-3 min.

9. A non-spandex stretch woven fabric, comprising: a method for preparing a non-spandex stretch woven fabric according to any one of claims 1 to 8, characterized in that: The fabric is collaboratively composed of warp yarns, face warp yarns and weft yarns, wherein the warp yarns are longitudinal elastic support layers, the face warp yarns are surface functional layers, and the weft yarns are transverse moisture-absorbing elastic layers; the fabric has a bionic sinusoidal wave binding structure, with a sinusoidal wave curvature radius of 8-12mm, an angle gradient of 38°-42°, increasing from the center to the edge, and a binding warp yarn spacing of 2-3mm; high color fastness is achieved through supercritical CO2 dyeing and finishing, and temperature-sensitive active elastic recovery is imparted through temperature-sensitive memory finishing, with a trigger temperature of 37±2°C; antistatic and friction resistance are improved through graphene nanosheet loading.

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