Spandex-free polyester high-elastic fabric with spiral structure and preparation method of spandex-free polyester high-elastic fabric

Abstract

The invention relates to the technical field of wrinkled fabric preparation, in particular to a spandex-free spiral structure polyester high-elastic fabric and a preparation method, and the spandex-free spiral structure polyester high-elastic fabric is formed by interweaving spiral yarn and linear yarn in a warp-weft mode. The spiral yarn is prepared from the following raw materials in parts by weight: 70-80 parts of polyethylene glycol terephthalate, 10-12 parts of terephthalic acid-ethylene glycol-polyethylene glycol block copolymer, 2-4 parts of ethylene-acrylate copolymer, 5-8 parts of modified cellulose whisker, 1-2 parts of coupling agent, 3-5 parts of polyether modified organic silicon and 1-2 parts of antioxidant. The spiral yarn and the linear yarn prepared according to the formula are interwoven in a warp and weft mode, and three-dimensional wrinkled textures similar to the spandex retraction effect are spontaneously formed by means of the internal stress difference generated when the spiral structure is in the heated or relaxed state of the fabric. The structure can obtain a lasting and controllable wrinkle effect without depending on the high-elasticity restoring force of spandex, so that the material limitation caused by the spandex is thoroughly avoided.

Description

Technical Field

[0001] This application relates to the field of pleated fabric preparation technology, and more specifically, to a spandex-free spiral structure polyester high-elastic fabric and its preparation method. Background Technology

[0002] Pleated fabrics are a type of special textile material with permanent or semi-permanent surface wrinkles, widely used in fashion apparel, home décor, and functional clothing. Traditionally, spandex is used to achieve the wrinkled effect in fabrics, primarily during the weaving stage. Spandex is typically embedded in the fabric structure under pre-tension and interwoven with low-elasticity or non-elastic fibers such as cotton and polyester. Due to spandex's excellent high elasticity and strong recovery properties, when the fabric is released from tension during subsequent processing (such as dyeing and washing) or use and subjected to wet heat treatment, the spandex quickly shrinks back, while the non-elastic fibers interwoven with it cannot shrink synchronously. This causes uneven deformation in localized areas of the fabric, spontaneously forming a stable, three-dimensional wrinkled structure. Furthermore, by controlling the content, distribution density, yarn twist, and weaving structure of spandex in the fabric, the shape, density, and intensity of the final wrinkled effect can be effectively adjusted, achieving diverse design effects from subtle textures to a strong sculptural feel.

[0003] However, despite its significant advantages in imparting dynamic wrinkles to fabrics, spandex still faces several technical bottlenecks in practical applications. Firstly, spandex has poor heat resistance and is prone to thermal oxidative degradation during typical high-temperature setting (180-200℃) or daily ironing, leading to a decrease in elastic modulus and even breakage. This not only weakens the stability of the wrinkled effect but also limits the range of finishing processes. Secondly, spandex is prone to aging under long-term use, repeated stretching, or exposure to environmental factors such as ultraviolet radiation and chlorine, exhibiting elasticity loss and reduced resilience. This causes the originally stable wrinkled structure to gradually loosen, deform, or even disappear, severely affecting the fabric's lifespan and appearance durability. Summary of the Invention

[0004] To address the aforementioned technical problems, this application provides a spandex-free spiral structure polyester high-elastic fabric and its preparation method.

[0005] In the first aspect, this application provides a spandex-free spiral structure polyester high-elastic fabric, which adopts the following technical solution: A spandex-free spiral structure polyester high-elastic fabric, wherein the spandex-free spiral structure polyester high-elastic fabric is formed by interlacing spiral yarns and straight yarns, and the spiral yarns are prepared from the following raw materials in parts by weight: 70-80 parts of polyethylene terephthalate 10-12 parts of terephthalic acid-ethylene glycol-polyethylene glycol block copolymer 2-4 parts of ethylene-acrylate copolymer 5-8 parts of modified cellulose whiskers 1-2 parts of coupling agent 3-5 parts of polyether-modified organosilicon 1-2 parts antioxidant.

[0006] By employing the above technical solution, spiral yarns prepared with a specific formula are interwoven with straight yarns in both warp and weft. Utilizing the internal stress differences generated by the spiral structure under heat or relaxation conditions, a three-dimensional wrinkled texture similar to the shrinkage effect of spandex is spontaneously formed. This structure achieves a durable and controllable wrinkled effect without relying on the high elastic recovery of spandex, thus completely avoiding the material limitations of spandex.

[0007] This application utilizes the synergistic effect of polyethylene terephthalate, terephthalic acid-ethylene glycol-polyethylene glycol block copolymer, and ethylene-acrylate copolymer, along with antioxidants, to significantly improve the thermal stability of the fabric under high-temperature setting at 180-200℃ or daily ironing conditions. This effectively prevents thermal degradation and ensures that the pleat shape remains stable after high-temperature treatment, avoiding the elasticity failure problem caused by thermal oxidation degradation of traditional spandex.

[0008] This application does not contain easily aging spandex, fundamentally avoiding the elasticity degradation problem caused by environmental factors such as ultraviolet light, chlorine water, and repeated stretching. At the same time, the added modified cellulose whiskers, as a nano-reinforcing phase, are well integrated with the polymer matrix under the action of coupling agents, improving yarn strength and dimensional stability; polyether-modified organosilicon imparts surface smoothness and internal lubrication to the fiber, reducing frictional damage during use and further ensuring the long-term retention of the pleated structure.

[0009] Preferably, the polyethylene terephthalate is composed of polyethylene terephthalate with an intrinsic viscosity of 0.60-0.75 dL / g, polyethylene terephthalate with an intrinsic viscosity of 0.40-0.55 dL / g, and polyethylene terephthalate with an intrinsic viscosity of 0.30-0.40 dL / g in a weight ratio of 1:(2-4):(4-6).

[0010] By employing the above technical solution, the high-viscosity component provides sufficient mechanical strength and thermal stability, the medium-viscosity component balances spinnability and elastic recovery, while the low-viscosity component further reduces melt viscosity, promotes uniform dispersion of block copolymers and additives, and induces microphase separation and internal stress gradients during cooling and forming. This multi-level viscosity synergistic system not only improves the forming stability and crimp retention of helical yarns but also enhances their spontaneous shrinkage ability after hydrothermal treatment, thereby more efficiently driving the fabric to form clear, durable, and elastic pleated structures, while avoiding the brittleness or excessive plasticity problems caused by single molecular weight PET.

[0011] Preferably, the number average molecular weight of the polyethylene glycol segments in the terephthalic acid-ethylene glycol-polyethylene glycol block copolymer is 1000-4000 g / mol, and the mass of the polyethylene glycol segments accounts for 30-50% of the total mass of the copolymer.

[0012] By adopting the above technical solutions, the appropriate PEG molecular weight ensures that the chain segments have sufficient freedom of movement to produce controllable shrinkage during heat treatment, while avoiding excessive phase separation or decreased hydrolysis resistance due to excessive molecular weight. The PEG content of 30-50% imparts good elastic recovery and soft hand feel to the spiral fibers while maintaining good compatibility with the PET matrix. This allows the spiral yarn to generate moderate and stable internal stress release under humid and hot dyeing and finishing conditions, thereby synergistically driving the fabric to form a uniform, three-dimensional and durable pleated structure, while improving the fabric's wearing comfort and dynamic deformation recovery ability.

[0013] Preferably, the modified cellulose whiskers are nanocellulose whiskers with surface grafted silane coupling agent, with a length of 500-2000 nm, a diameter of 10-50 nm, and a grafting rate of 8-15 wt%.

[0014] By adopting the above technical solution, the dispersion and interfacial bonding strength of cellulose whiskers in polyester matrix are further improved. The high aspect ratio whiskers at the nanoscale can effectively serve as physical cross-linking points and form an effective physical cross-linking network in polyester matrix, further improving the rigidity, creep resistance and heat setting stability of spiral yarn. At the same time, it avoids the problems of easy agglomeration and fiber damage of traditional fillers, giving the fabric excellent dimensional stability and durability.

[0015] Preferably, the antioxidant is a mixture of hindered phenolic antioxidants and phosphite antioxidants in a mass ratio of 1:(2-3).

[0016] By employing the above technical solution, the thermo-oxidative stability of spiral polyester yarn during high-temperature processing and use is improved. Hindered phenolic antioxidants, acting as the primary antioxidant, effectively capture free radicals and inhibit the oxidative degradation of polymer chains. Phosphite antioxidants, acting as secondary antioxidants, preferentially decompose hydroperoxides, blocking the initiation and propagation of oxidative chain reactions. When these two are compounded in an optimized ratio, they form a highly efficient protective system under melt spinning, high-temperature setting, and long-term heat exposure conditions. This system not only delays polyester molecular chain breakage and yellowing but also ensures the integrity and elastic recovery of the spiral structure, thereby ensuring the stability of the pleated shape during multiple heat treatments or long-term use. Simultaneously, it avoids precipitation and failure problems caused by insufficient effectiveness or poor compatibility of a single antioxidant.

[0017] Preferably, the ethylene-acrylate copolymer is an ethylene-methyl acrylate copolymer or an ethylene-ethyl acrylate copolymer, and its melt flow rate is 3-10 g / 10 min at 190°C and 2.16 kg.

[0018] By adopting the above technical solutions, the flexibility and impact resistance of the spiral polyester yarn are effectively improved. The moderate melt flow rate ensures good melt compatibility and dispersibility during the blending and spinning process with high-viscosity PET, avoiding phase separation or yarn breakage due to excessive viscosity differences. The introduction of acrylate side chains forms flexible micro-regions in the polyester matrix, relieving internal stress concentration, enhancing the yarn's elastic recovery and deformation adaptability during crimping and subsequent wet heat treatment, maintaining the dimensional stability of the overall structure, and helping to form a flexible and durable wrinkle effect.

[0019] Secondly, this application provides a method for preparing a spandex-free spiral structure polyester high-elastic fabric, employing the following technical solution: A method for preparing a spandex-free spiral structure polyester high-elastic fabric includes the following preparation steps: S1. Polyethylene terephthalate, terephthalic acid-ethylene glycol-polyethylene glycol block copolymer, ethylene-acrylate copolymer, modified cellulose whiskers, coupling agent, polyether-modified organosilicon and antioxidant are mixed and then melt-blended to obtain modified polyester melt. S2. The yarn is then spun into pre-oriented yarn by melt spinning, and then processed into a spiral crimp structure by false twisting at 120-140℃ to obtain a spiral yarn. S3. Then, the spiral yarn and straight yarn are woven together by interlacing the warp and weft to form a fabric, resulting in a spandex-free spiral structure polyester high-elastic fabric.

[0020] By adopting the above technical solution, in step S1, each functional component is uniformly dispersed in the polyester matrix, forming a modified melt with thermal stability, flexibility, and internal stress response capabilities. In step S2, false twisting deformation technology is used at 120-140℃ to induce a stable and uniform helical crimp structure in the pre-oriented yarn while retaining sufficient strength. This structure can spontaneously generate controllable shrinkage during subsequent wet heat treatment. In step S3, a differential shrinkage system is constructed inside the fabric through the interweaving of helical and straight yarns, automatically generating a three-dimensional, durable, and elastic wrinkled texture during dyeing, finishing, or use without the need for spandex. The entire process is compatible with conventional polyester spinning and weaving equipment, is simple and scalable, and not only avoids the problems of poor heat resistance and easy aging caused by spandex, but also improves the dimensional stability, resilience, and service life of the fabric, combining functionality, environmental protection, and industrial feasibility.

[0021] Preferably, the ratio of the spiral yarn to the straight yarn is 1:2-4, and the spiral angle of the spiral yarn is 15-30°, and the pitch is 0.5-1.2mm.

[0022] By adopting the above technical solution, the synergistic optimization of pleat morphology and elasticity is achieved at the fabric structure level: the appropriate helix angle and short pitch give the yarn good crimp recovery force and energy storage capacity, enabling it to effectively shrink after wet heat treatment or external force release; while the reasonable yarn arrangement ratio ensures sufficient shrinkage driving force to form clear and three-dimensional pleat texture, while avoiding excessive fabric shrinkage, stiff hand feel or size loss due to excessive helix yarn density, while exhibiting a uniform, stable and elastic dynamic wrinkle feel, and ensuring that the pleat effect lasts through multiple washes and long-term use.

[0023] Preferably, the warp and weft interweaving structure is plain weave, twill weave, or satin weave, with a warp density of 200-400 yarns / 10cm and a weft density of 180-360 yarns / 10cm, wherein the spiral yarns are used as warp yarns and the straight yarns are used as weft yarns.

[0024] By employing the above technical solutions, a high warp density and a moderate weft density ensure that the spiral warp yarns can fully shrink back during weaving tension relief and finishing processes, while the low-elasticity weft yarns provide dimensional constraints. Together, they induce a consistent and evenly distributed longitudinal pleat texture. Plain weave creates a delicate and dense texture, twill weave imparts good drape and three-dimensionality to the fabric, and satin weave brings a smooth luster and greater deformation tolerance. This configuration not only fully utilizes the self-shrinking properties of the spiral warp yarns to stably generate lasting pleats, but also takes into account the fabric's strength, breathability, and comfort, meeting the dual functional and aesthetic needs of different end-use scenarios.

[0025] Preferably, the straight yarn is one of polyethylene terephthalate fully drawn filament, polyethylene terephthalate filament, or bio-based polyamide filament.

[0026] All of the aforementioned filaments possess low elasticity, high dimensional stability, and excellent mechanical strength. When used as weft yarns, they exhibit almost no shrinkage during wet heat treatment, creating a significant differential shrinkage effect with the spiral warp yarns. This effectively drives directional wrinkling of the fabric, achieving clear, durable, and diverse pleated effects in conjunction with the spiral structure, while ensuring the overall durability, smoothness, and wearing comfort of the fabric.

[0027] In summary, this application has the following beneficial effects: 1. Durable wrinkles achieved without spandex: Through the differential shrinkage mechanism of spiral yarn and straight yarn, stable, three-dimensional and controllable wrinkle textures are spontaneously formed without spandex, completely avoiding the inherent defects of spandex such as easy aging, heat sensitivity and difficulty in recycling.

[0028] 2. Excellent high temperature resistance: Made primarily of polyethylene terephthalate, in combination with block copolymers, ethylene-acrylate copolymers and compound antioxidants, the fabric can withstand high-temperature shaping or ironing at 180–200℃, effectively preventing thermal oxidative degradation and ensuring that the pleat shape remains stable during high-temperature post-processing.

[0029] 3. Excellent durability and anti-aging properties: Completely free of spandex, fundamentally eliminating elasticity loss caused by ultraviolet rays, chlorine water or repeated stretching; combined with a modified cellulose whisker reinforcement system and a polyether modified silicone lubrication system, significantly improving yarn strength, dimensional stability and anti-friction performance, ensuring that the pleated effect does not loosen or deform over a long period of time. Detailed Implementation Example

[0030] The hindered phenolic antioxidant is antioxidant 1010.

[0031] The phosphite antioxidant is tris(2,4-di-tert-butylphenyl) phosphite.

[0032] The polyether-modified organosilicon was purchased from Shanghai Jiadeer Chemical Technology Co., Ltd., and the model number is polyether-modified polyorganosiloxane 8030F. Example 1

[0033] A spandex-free spiral structure polyester high-elastic fabric is prepared by the following method: S1. Mix 700g of polyethylene terephthalate, 100g of terephthalic acid-ethylene glycol-polyethylene glycol block copolymer, 20g of ethylene-acrylate copolymer, 50g of modified cellulose whiskers, 10g of coupling agent (γ-aminopropyltriethoxysilane), 30g of polyether-modified organosilicon and 10g of antioxidant, and then melt blend to obtain modified polyester melt; Polyethylene terephthalate is composed of polyethylene terephthalate with an intrinsic viscosity of 0.60 dL / g, polyethylene terephthalate with an intrinsic viscosity of 0.40 dL / g, and polyethylene terephthalate with an intrinsic viscosity of 0.30 dL / g in a weight ratio of 1:2:4. The number average molecular weight of the polyethylene glycol segments in the terephthalic acid-ethylene glycol-polyethylene glycol block copolymer is 1000 g / mol, and the mass of the polyethylene glycol segments accounts for 30% of the total mass of the copolymer. The modified cellulose whiskers are nano-cellulose whiskers with surface grafting of γ-aminopropyltriethoxysilane, with a length of 500 nm, a diameter of 10 nm, and a grafting rate of 8 wt%. The antioxidant is a mixture of hindered phenolic antioxidant (antioxidant 1010) and phosphite antioxidant (tris(2,4-di-tert-butylphenyl) phosphite) in a mass ratio of 1:2. The ethylene-acrylate copolymer is an ethylene-methyl acrylate copolymer, and its melt flow rate is 3 g / 10 min at 190℃ and 2.16 kg. S2. The yarn is then spun into pre-oriented yarn by melt spinning, and then processed into a spiral crimp structure by false twisting at 120°C to obtain a spiral yarn. S3. Then, the spiral yarn and straight yarn are interwoven to form a fabric, resulting in a spandex-free spiral structure polyester high-elastic fabric. The ratio of spiral yarn to straight yarn is 1:2, and the spiral angle of the spiral yarn is 15° with a pitch of 0.5mm. The weave structure is plain weave, with a warp density of 200 yarns / 10cm and a weft density of 180 yarns / 10cm. Spiral yarns are used as warp yarns, and straight yarns are used as weft yarns. The straight yarn is a fully drawn polyethylene terephthalate filament.

[0034] The difference between Examples 2-3 and Example 1 lies in the types, amounts, and parameters of raw materials used to prepare the spandex-free spiral structure polyester high-elastic fabric. Specific differences are shown in Table 1. Table 1. Raw material types, dosages, and parameters for preparing spandex-free spiral structure polyester high-elastic fabrics. Example 4

[0035] A spandex-free spiral structure polyester high-elastic fabric. The difference between this embodiment and Embodiment 1 is that the polyethylene terephthalate is polyethylene terephthalate with an intrinsic viscosity of 0.60 dL / g.

[0036] Example 5 A spandex-free spiral structure polyester high-elastic fabric, the difference between this embodiment and embodiment 1 is that the polyethylene terephthalate is composed of polyethylene terephthalate with an intrinsic viscosity of 0.40 dL / g and polyethylene terephthalate with an intrinsic viscosity of 0.30 dL / g in a weight ratio of 2:4.

[0037] Example 6 A spandex-free spiral structure polyester high-elastic fabric. The difference between this embodiment and Embodiment 1 is that the number average molecular weight of the polyethylene glycol segments in the terephthalic acid-ethylene glycol-polyethylene glycol block copolymer is 500 g / mol, and the mass of the polyethylene glycol segments accounts for 30% of the total mass of the copolymer.

[0038] Example 7 A polyester high-elastic fabric with a non-spandex spiral structure. The difference between this embodiment and Embodiment 1 is that the modified cellulose whiskers are nano-cellulose whiskers with a surface grafted silane coupling agent and a length of 100 nm.

[0039] Comparative Example Comparative Example 1 A spandex-free spiral structure polyester high-elastic fabric, the difference between this comparative example and Example 1 is that no terephthalic acid-ethylene glycol-polyethylene glycol block copolymer is added.

[0040] Comparative Example 2 A spandex-free spiral structure polyester high-elastic fabric is described. The difference between this comparative example and Example 1 is that silica is used instead of modified cellulose whiskers.

[0041] Comparative Example 3 A spandex-free spiral structure polyester high-elastic fabric, the difference between this comparative example and Example 1 is that polyethylene is used instead of ethylene-acrylate copolymer.

[0042] The melt flow rate of polyethylene at 190℃ and 2.16kg is 3g / 10min.

[0043] Comparative Example 4 A polyester high-elastic fabric with a non-spandex spiral structure is described. The difference between this comparative example and Example 1 is that in step S2, the yarn is spun into pre-oriented yarn by melt spinning and then subjected to a 120°C environment for the same duration as the false twisting process in Example 1 to obtain straight yarn.

[0044] Detection methods / test methods Elastic recovery performance test: Refer to GB / T 3917.3-2009 "Textiles - Tensile Properties of Fabrics", with a fixed elongation of 30% and 5 cycles of tensile testing; High temperature stability test: Refer to the heat treatment clause of GB / T 18830-2009 "Evaluation of UV protection performance of textiles", dry heat setting at 180℃ / 200℃ for 60 seconds, wet heat steam treatment at 120℃ for 30 minutes, and then test the elastic recovery performance.

[0045] Light aging resistance test: Refer to GB / T 8430-1998 "Textiles - Tests for color fastness to artificial weathering: Xenon arc", irradiation intensity 0.42W / m²@420nm, continuous for 72h, and then test elastic recovery performance.

[0046] Wrinkle durability test: Following AATCC 124-2011 "Appearance of Fabrics after Repeated Home Laundering", a standard washing machine cycle was used for 10 cycles to evaluate wrinkle appearance. Levels 4-5 showed clear wrinkles with almost no change; levels 3-4 showed noticeable wrinkles with slight decay; levels 2-3 showed visible wrinkles with moderate decay; and levels <2 showed blurred wrinkles and severe decay. Experimental data are shown in Table 2. Table 2 Experimental data of Examples 1-7 and Comparative Examples 1-4

[0047] The experimental data above show that this application, through the combined use of components such as multi-viscosity polyethylene terephthalate, terephthalic acid-ethylene glycol-polyethylene glycol block copolymer, ethylene-acrylate copolymer, modified cellulose whiskers, and antioxidants, can greatly improve the elastic recovery performance, high temperature resistance, and anti-aging performance of the fabric, while also making the pleats last longer and more stable.

[0048] Compared with Comparative Examples 1-4, Example 1 shows a significant decrease in elastic recovery rate, reduced high-temperature resistance and aging resistance, and poor wrinkle retention. This indicates that the fabric prepared by the specific formula and process of this application has good elastic recovery performance, high-temperature resistance, anti-aging performance, and wrinkle retention stability.

[0049] Comparing Example 1 with Examples 4-5 illustrates the synergistic supporting effect of high, medium, and low viscosity PET composites on helical forming stability and creep resistance, thereby ensuring that the fabric has good elastic recovery performance, high temperature resistance, anti-aging performance, and long-lasting wrinkle stability.

[0050] Comparing Example 1 with Examples 6-7, it is shown that optimizing the parameters of the terephthalic acid-ethylene glycol-polyethylene glycol block copolymer and the ethylene-acrylate copolymer can improve the elastic recovery performance, high temperature resistance and anti-aging performance of the fabric, while making the wrinkles more durable.

[0051] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A spandex-free spiral structure polyester high-elastic fabric, characterized in that, The polyester high-elastic fabric with a non-spandex spiral structure is made of spiral yarns and straight yarns interwoven in warp and weft. The spiral yarns are prepared from the following raw materials in parts by weight: 70-80 parts of polyethylene terephthalate 10-12 parts of terephthalic acid-ethylene glycol-polyethylene glycol block copolymer 2-4 parts of ethylene-acrylate copolymer 5-8 parts of modified cellulose whiskers 1-2 parts of coupling agent 3-5 parts of polyether-modified organosilicon 1-2 parts antioxidant.

2. The spandex-free spiral structure polyester high-elastic fabric according to claim 1, characterized in that: The polyethylene terephthalate is composed of polyethylene terephthalate with an intrinsic viscosity of 0.60-0.75 dL / g, polyethylene terephthalate with an intrinsic viscosity of 0.40-0.55 dL / g, and polyethylene terephthalate with an intrinsic viscosity of 0.30-0.40 dL / g in a weight ratio of 1:(2-4):(4-6).

3. The spandex-free spiral structure polyester high-elastic fabric according to claim 2, characterized in that: The number average molecular weight of the polyethylene glycol segments in the terephthalic acid-ethylene glycol-polyethylene glycol block copolymer is 1000-4000 g / mol, and the mass of the polyethylene glycol segments accounts for 30-50% of the total mass of the copolymer.

4. The spandex-free spiral structure polyester high-elastic fabric according to claim 1, characterized in that: The modified cellulose whiskers are nanocellulose whiskers with surface grafted silane coupling agents, with a length of 500-2000 nm, a diameter of 10-50 nm, and a grafting rate of 8-15 wt%.

5. The spandex-free spiral structure polyester high-elastic fabric according to claim 1, characterized in that: The antioxidant is a mixture of hindered phenolic antioxidants and phosphite antioxidants in a mass ratio of 1:(2-3).

6. The spandex-free spiral structure polyester high-elastic fabric according to claim 1, characterized in that: The ethylene-acrylate copolymer is an ethylene-methyl acrylate copolymer or an ethylene-ethyl acrylate copolymer, and its melt flow rate is 3-10 g / 10 min at 190°C and 2.16 kg.

7. A method for preparing a spandex-free spiral structure polyester high-elastic fabric as described in any one of claims 1-6, characterized in that, The preparation steps include the following: S1. Polyethylene terephthalate, terephthalic acid-ethylene glycol-polyethylene glycol block copolymer, ethylene-acrylate copolymer, modified cellulose whiskers, coupling agent, polyether-modified organosilicon and antioxidant are mixed and then melt-blended to obtain modified polyester melt. S2. The yarn is then spun into pre-oriented yarn by melt spinning, and then processed into a spiral crimp structure by false twisting at 120-140℃ to obtain a spiral yarn. S3. Then, the spiral yarn and straight yarn are woven together by interlacing the warp and weft to form a fabric, resulting in a spandex-free spiral structure polyester high-elastic fabric.

8. The method for preparing the spandex-free spiral structure polyester high-elastic fabric according to claim 7, characterized in that: The ratio of the spiral yarn to the straight yarn is 1:2-4, and the spiral angle of the spiral yarn is 15-30°, with a pitch of 0.5-1.2mm.

9. The method for preparing the spandex-free spiral structure polyester high-elastic fabric according to claim 7, characterized in that: The interwoven warp and weft structure is plain weave, twill weave, or satin weave, with a warp density of 200-400 yarns / 10cm and a weft density of 180-360 yarns / 10cm, wherein spiral yarns are used as warp yarns and straight yarns are used as weft yarns.

10. The method for preparing the spandex-free spiral structure polyester high-elastic fabric according to claim 7, characterized in that: The straight yarn is one of polyethylene terephthalate fully drawn filament, polyethylene terephthalate filament, or bio-based polyamide filament.

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