Directional moisture-conducting, dry, comfortable, breathable and quick-drying fabric and preparation method thereof

Abstract

The invention belongs to the field of functional textile materials, and provides a directional moisture-conducting, dry, comfortable, breathable and quick-dry fabric and a preparation method thereof. A three-layer composite structure design is adopted, the outer layer is a gradient wetting structure formed by attaching a thermoplastic polyurethane film subjected to single-face thermal orientation treatment and knitted fabric, the middle layer is a hydrophilic non-woven fabric, the inner layer is a knitted fabric subjected to hydrophilic finishing, and the two layers are compounded through a hot melt adhesive dot-shaped net. Hydrophilic blocks of the thermoplastic polyurethane film are directionally enriched through single-face contact heating, gradient distribution with one hydrophilic side and one hydrophobic side is formed, and the hydrophobic surface is coated with a low-surface-energy coating. The fabric has excellent one-way moisture conduction performance, moisture can be rapidly transmitted from the inner layer to the outer layer and rapidly volatilized, dryness and comfort of the close-fitting fabric are kept, meanwhile, the fabric has good air permeability and quick-drying performance, the moisture conduction rate is increased by 30% or above compared with that of traditional fabric, and the fabric is suitable for being popularized and applied. The fabric has wide application value in the fields of sportswear, outdoor equipment, leakage-proof underpants and the like.

Description

Technical Field

[0001] This invention belongs to the field of functional textile materials and provides a directional moisture-wicking, breathable, and quick-drying fabric and its preparation method. Background Technology

[0002] With the transformation of modern lifestyles and the upgrading of consumer demands, the markets for sportswear, outdoor equipment, and close-fitting functional textiles are experiencing rapid growth. These application areas are placing increasingly higher demands on the functionality of fabrics. During intense exercise, the human body produces a large amount of sweat. How to effectively manage this moisture directly affects the wearer's comfort and athletic performance; therefore, excellent moisture-wicking properties have become one of the core requirements for functional fabrics. At the same time, breathability, as a key factor in maintaining the comfort of the wearing microenvironment, ensures air circulation and prevents stuffiness, which is crucial for comfort during extended wear. The synergistic effect of these two properties not only significantly improves the user's wearing experience but also effectively prevents skin discomfort and bacterial growth caused by humid and hot environments. With the continuous expansion of the smart textiles and high-performance sports equipment markets, fabric materials with excellent moisture-wicking and breathability have become an important driving force for technological progress and product innovation in the entire functional textile industry, playing an increasingly important role in enhancing product added value, meeting personalized consumer needs, and expanding application areas.

[0003] Despite the rapid development of functional fabric technology, current moisture-wicking and breathable fabrics still face numerous technical bottlenecks and performance limitations. Traditional moisture-wicking fabrics primarily rely on the inherent hygroscopicity of the fibers or simple structural designs to transfer moisture. This approach often results in low moisture-wicking efficiency, failing to achieve rapid unidirectional moisture wicking and causing moisture to trap inside the fabric, affecting dryness. Simultaneously, existing fabrics also face challenges in breathability. Many products sacrifice breathability in pursuit of waterproof and windproof performance, or breathability and moisture-wicking properties are not effectively coordinated, leading to a decline in overall comfort. For example, Chinese patent CN208343598U discloses a composite moisture-wicking fabric, but it suffers from unclear moisture wicking direction and discontinuous moisture transfer paths. Furthermore, Chinese patent CN218660847U discloses a breathable and quick-drying fabric, but it suffers from difficulties in balancing breathability and moisture-wicking properties and poor functional durability. These technical limitations mainly stem from the singularity of material design concepts, the complexity of processing technology, and the lack of understanding of moisture transfer mechanisms. This makes it difficult for existing products to simultaneously meet the dual performance requirements of efficient moisture wicking and excellent breathability, severely restricting the promotion and application of functional fabrics in high-end application fields. Summary of the Invention

[0004] (1) Technical problems to be solved The purpose of this invention is to provide a directional moisture-wicking, quick-drying, breathable and breathable fabric and its preparation method, so as to solve the problem of insufficient moisture-wicking and breathability of current fabrics.

[0005] (2) Technical solution To achieve the above objectives, the present invention provides the following technical solution: a directional moisture-wicking, breathable, and quick-drying fabric, comprising a three-layer composite structure consisting of an outer composite, a middle layer, and an inner layer arranged sequentially from the outside to the inside; the outer composite is formed by bonding a thermoplastic polyurethane film to a knitted fabric, with the thermoplastic polyurethane film located on the outside of the knitted fabric; the thermoplastic polyurethane film undergoes heat orientation treatment via single-sided contact heating to directionally enrich hydrophilic blocks, forming a gradient wetting structure where the side bonded to the knitted fabric is hydrophilic and the side away from the knitted fabric is hydrophobic; furthermore, the thermoplastic polyurethane film has a micropore / microslit array that extends through the film thickness, thereby enabling the fabric to simultaneously possess water vapor permeability and air permeability, and the micropores / microslits remain interconnected after coating and lamination; the middle layer is a hydrophilic nonwoven fabric; the inner layer is a knitted fabric treated with hydrophilic finishing; the three layers are laminated together using a hot melt adhesive dotted mesh.

[0006] This invention employs a three-layer composite structure primarily to enhance the moisture-wicking and breathability of fabrics. The core objective of this design is to construct an efficient moisture transport channel, achieving superior unidirectional moisture wicking through the synergistic effect of different functional layers. The thermoplastic polyurethane membrane in the outer composite layer undergoes heat-oriented treatment via single-sided contact heating, resulting in the directional enrichment of hydrophilic blocks and forming a unique gradient wetting structure. The side adhering to the knitted fabric is hydrophilic, while the side away from the knitted fabric is hydrophobic. This asymmetric wetting design provides the driving force for directional moisture transport. The middle layer, a hydrophilic nonwoven fabric, acts as a relay station for moisture transport, rapidly absorbing and conducting moisture from the inner layer, ensuring the continuity of the moisture transport path. The inner layer, a hydrophilic-treated knitted fabric, directly contacts the human skin, possessing excellent moisture absorption capacity and rapidly absorbing moisture from the skin and transferring it to the middle layer. The three-layer structure is composited using a hot-melt adhesive dot-matrix network, ensuring effective connection between the layers while maintaining necessary breathable channels. This multi-layered functional design allows each layer to play its specific role, while the layers work together organically. Moisture can be quickly and continuously transported from the inner layer to the outer layer along the designed path and evaporate rapidly, thus achieving comprehensive performance superior to that of a single material.

[0007] Furthermore, the method for preparing the thermoplastic polyurethane film includes the following steps: A1. The thermoplastic polyurethane resin and polyethylene glycol-polytetrahydrofuran diol block copolymer are mixed evenly and then melt-blended in a twin-screw extruder at a temperature of 180-190℃, with the extrusion screw speed being 80-120 rpm. A2. Film is cast using a T-die, with the die outlet temperature at 185-195℃ and the film thickness controlled at 10-15μm. The film is then cooled and shaped using a three-roller cooling system, with the cooling roller temperature at 45-60℃. A3. The thermoplastic polyurethane film is subjected to heat orientation treatment by single-sided contact heating at a temperature of 120-145℃ for 8-15 minutes. The hydrophilic block is oriented and enriched by single-sided contact heating plate heating. The contact pressure is 0.1-0.3MPa, forming a gradient wettability distribution with the side of the fabric attached to the knitted fabric being hydrophilic and the side away from the knitted fabric being hydrophobic. A4. After step A3, the thermoplastic polyurethane film is subjected to microporous treatment to form an array of micropores / microslits that span the film thickness. A5. A low surface energy coating containing hydrophobic groups is applied to a hydrophobic surface. The coating amount is 0.6-1.2 g / m², and the coating amount is determined by the dry weight method. The micropores / microslits remain interconnected after coating.

[0008] Furthermore, the microporous treatment is a needle roller microporous treatment, wherein the needle roller has a regular array of microneedles, so that the thermoplastic polyurethane film passes through the hot pressing zone between the needle roller and the support roller under the film surface temperature of 80–100°C and the linear pressure of 60–100 N / mm, forming a discrete through-hole / micro-slit array with a through-hole diameter of 240–500 μm, a hole spacing of 0.8–1.2 mm and a low porosity, and maintaining the continuity after subsequent coating.

[0009] Furthermore, the mass ratio of the thermoplastic polyurethane resin to the polyethylene glycol-polytetrahydrofuran diol block copolymer is 92-95:5-8.

[0010] Furthermore, the preparation method of the polyethylene glycol-polytetrahydrofuran diol block copolymer includes the following steps: B1. Raw material pretreatment: Polyethylene glycol with a molecular weight of 400-600 and polytetrahydrofuran diol with a molecular weight of 650-1000 are mixed at a molar ratio of 1:1.0-2.0 and dried separately at a temperature of 80-110℃ under reduced pressure for 1-2 hours to obtain dehydrated polyethylene glycol and polytetrahydrofuran diol. B2. Prepolymerization reaction: Under an inert atmosphere, the polytetrahydrofuran diol obtained in step B1 is reacted with hexamethylene diisocyanate at a molar ratio of NCO groups to OH groups of 2.05-2.20. Dibutyltin dilaurate catalyst is added at an amount of 50-200 ppm, and the reaction is carried out at a temperature of 70-85℃ for 0.5-2 h to obtain NCO-terminated prepolymer. B3. Hydroxyl end-capping and block formation: At a temperature of 70-90℃, the polyethylene glycol obtained in step B1 is reacted at a molar ratio of OH groups to NCO groups of 1.02-1.10, and then added to the prepolymer obtained in step B2 and reacted for 1-3 hours to obtain polyethylene glycol-polytetrahydrofuran hydroxyl end-capped block diols linked by urethane bonds. B4. Deviation and purification: The reaction product obtained in step B3 is subjected to volatile removal at 80–100℃ and absolute pressure ≤1kPa and then subjected to hot filtration to obtain a polyethylene glycol-polytetrahydrofuran diol block copolymer with a hydroxyl value of 56–112 mgKOH / g and a corresponding number average molecular weight of 1000–2000.

[0011] Furthermore, the coating step of the low surface energy coating includes: C1. Dissolve the methyl methacrylate-butyl acrylate copolymer in toluene or butanone solvent to prepare a coating solution with a solid content of 8-15%; C2. Apply the coating to the hydrophobic surface of the thermoplastic polyurethane film using a doctor blade coating method. The doctor blade tilt angle is 30-45° and the coating speed is 5-15m / min. C3. The coating amount is controlled at 0.6-1.2 g / m², and the coating amount is determined by the dry weight method. Precise control is achieved by adjusting the doctor blade gap and the coating solution concentration. C4. Curing at 150-165℃ for 2-5 minutes forms a uniform low surface energy coating.

[0012] This invention utilizes a composite modified thermoplastic polyurethane film primarily to enhance the gradient wetting and directional moisture-wicking properties of fabrics. The core objective of this design is to construct an asymmetric wetting interface through molecular structure regulation and surface functionalization. First, thermoplastic polyurethane resin is melt-blended with a polyethylene glycol-polytetrahydrofuran diol block copolymer at a specific mass ratio. The crucial single-sided contact heating process, a thermo-directional treatment, controls temperature and contact pressure to directionally enrich hydrophilic blocks on one side of the film, creating a gradient wetting distribution where the side facing the knitted fabric is hydrophilic and the side away from the knitted fabric is hydrophobic. This asymmetric structure provides a thermodynamic driving force for unidirectional moisture transport. Further, a low surface energy coating formed by methyl methacrylate-butyl acrylate copolymer is coated onto the hydrophobic surface. The uniformity and adhesion of the coating are ensured through a doctor blade coating and thermosetting process, significantly enhancing the hydrophobic properties of the hydrophobic surface. This multi-level molecular design and surface modification strategy enables thermoplastic polyurethane films to possess comprehensive functional properties far exceeding those of single components, achieving a precise spatial distribution of hydrophilicity and hydrophobicity.

[0013] Furthermore, the outer composite knitted fabric is a warp-knitted or weft-knitted fabric woven from polyester or polyamide fibers; the middle layer hydrophilic nonwoven fabric is a spunlace or needle-punched nonwoven fabric made from a mixture of polyvinyl alcohol fibers and polyester fibers in a mass ratio of 2:8 to 5:5; the inner layer hydrophilically treated knitted fabric is a plain knitted or rib knitted fabric woven from polyester or polyamide fibers, treated with polyethylene glycol monomethyl ether or hydroxyethyl cellulose hydrophilic finishing agent, with an areal density of 100-200 g / m².

[0014] This invention also discloses a method for preparing a moisture-wicking, breathable, and quick-drying fabric, comprising the following steps: S1. Preparation of outer composite: The hydrophilic surface of the thermoplastic polyurethane film is bonded to the knitted fabric, with the thermoplastic polyurethane film located on the outside of the knitted fabric. The bonding is done by dot-shaped or strip-shaped hot pressing, with the bonding area accounting for 20-40% of the total area and the bonding dot spacing being 5-10 mm. The bonding is carried out at a temperature of 120-140℃ and a pressure of 0.2-0.5 MPa for 1-3 min to form the outer composite. S2. Intermediate layer preparation: Select a hydrophilic nonwoven fabric with a surface density of 40-80g / m² as the intermediate layer; S3. Inner layer preparation: Select a hydrophilic knitted fabric as the inner layer; S4. Three-layer integral composite: The knitted fabric surface of the outer composite, the hydrophilic nonwoven fabric of the middle layer, and the knitted fabric of the inner layer are stacked in sequence, with the outer composite on the outermost side and the thermoplastic polyurethane film facing outward. The three-layer integral composite fabric is formed by hot pressing with a copolyester hot melt adhesive dotted network at a temperature of 140-150℃ and a pressure of 0.1-0.3MPa for 2-5 minutes.

[0015] Furthermore, in step S4, the diameter of the adhesive dots in the copolyester hot melt adhesive dot network is 0.3-0.8 mm, the area coverage is 15-25%, and the melting temperature of the hot melt adhesive is 130-150℃.

[0016] Application of a moisture-wicking, breathable, and quick-drying fabric in the inner layer of sportswear.

[0017] The outer composite layer of this invention, serving as the outermost structure of the fabric, primarily undertakes the final evaporation and protection functions of moisture. Its core role lies in achieving directional transport and rapid dissipation of moisture through the gradient wetting structure of the thermoplastic polyurethane film. The middle layer, hydrophilic nonwoven fabric, focuses on rapid absorption and intermediate conduction of moisture, providing a crucial transport channel for the entire moisture-wicking system. The inner layer, hydrophilically treated knitted fabric, is mainly responsible for direct contact with the human body and initial moisture absorption, ensuring timely collection of moisture from the skin surface. Regarding improved moisture-wicking performance, the outer composite layer, through asymmetric wetting interfaces formed by single-sided heat orientation treatment, utilizes the surface energy difference between the hydrophilic and hydrophobic surfaces to provide a thermodynamic driving force for moisture transport. The composite structure of polyvinyl alcohol fibers and polyester fibers in the middle layer forms a continuous hydrophilic network, while the molecular chain segments of the hydrophilic finishing agent in the inner layer enhance the wetting properties of the fiber surface. In terms of improved breathability, the dotted heat-pressing composite method of the outer composite layer retains gas flow channels, the porous nonwoven structure of the middle layer provides a good breathability path, and the elastic deformation of the inner knitted structure further optimizes the breathability effect. The synergistic effect of the three-layer structure is manifested in the continuity of the moisture transport path and the multiplication effect of transport efficiency. The directional transport of the outer layer, the rapid relay of the middle layer, and the efficient absorption of the inner layer form a complete moisture management cycle. At the same time, the air permeable channels of each layer are interconnected, realizing the synchronous optimization of moisture wicking and air permeability, and showing a comprehensive functional performance far exceeding that of single-layer materials.

[0018] (3) Beneficial technical effects 1. Significantly improves unidirectional moisture wicking performance: The thermoplastic polyurethane film is heat-oriented through single-sided contact heating, which causes the hydrophilic blocks to be oriented and enriched to form a gradient wetting structure with the side of the fabric that is attached to the knitted fabric being hydrophilic and the side that is away from the knitted fabric being hydrophobic. Combined with the hydrophobic enhancement treatment of the low surface energy coating, a clear directionality of moisture transport is constructed at the microscopic molecular level, realizing efficient unidirectional moisture transport from the inner layer to the outer layer, effectively avoiding the backflow problem caused by the bidirectional diffusion of moisture in traditional fabrics. 2. Significantly improved breathability: Through the precise design of the three-layer composite structure, the outer composite layer adopts a dot-shaped or strip-shaped hot-pressing composite method, with the composite area accounting for only 20-40% of the total area, maximizing the preservation of breathable channels. The porous non-woven structure of the middle layer, which is a mixture of polyvinyl alcohol fiber and polyester fiber, provides a continuous breathable path. The elastic structure of the inner knitted fabric further optimizes the gas flow effect. The three breathable channels are interconnected to form a three-dimensional breathable network, significantly improving the overall breathability. 3. Achieve rapid drying effect: Through the directional moisture-guiding mechanism of the gradient wetting structure and the synergistic effect of multi-layer breathable channels, moisture can be quickly transferred from the human body surface to the outer surface of the fabric and evaporate rapidly. At the same time, the optimized breathability accelerates the evaporation and loss of moisture, effectively shortens the drying time of the fabric, keeps the inner layer of the fabric dry for a long time, and significantly improves wearing comfort. 4. Maintain long-term functional stability: Through the molecular chain segment design of polyethylene glycol-polytetrahydrofuran diol block copolymer and the precise control of thermal orientation treatment process, the gradient wetting structure forms a stable asymmetric distribution at the molecular level. Combined with the copolyester hot melt adhesive dot network composite process, it ensures a strong bond between each functional layer, so that the fabric's moisture-wicking and breathable function has excellent washability and durability, avoiding the performance degradation problem common in functional fabrics. 5. Optimized wearing comfort: The inner layer is treated with polyethylene glycol monomethyl ether or hydroxyethyl cellulose hydrophilic finishing agent to improve its affinity with human skin. The middle layer of hydrophilic nonwoven fabric has a soft texture and good moisture buffering capacity. The outer layer of knitted fabric has excellent mechanical properties and dimensional stability. The three-layer structure works together to ensure excellent functionality while maintaining good hand feel and wearing comfort, achieving a perfect balance between functionality and comfort. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the mechanism of the directional moisture-wicking, breathable, and quick-drying fabric of the present invention. Figure 2 The FTIR spectra of the hydrophobic surface, hydrophilic surface, and low surface energy coating of the thermoplastic polyurethane film in Example 1 of the present invention are shown below. Figure 3 This describes the unidirectional transmission and moisture absorption performance of the embodiments and comparative examples of the present invention; Figure 4 The wetting characteristics and contact angle difference of the embodiments and comparative examples of the present invention; Figure 5 The air permeability and drying performance of the embodiments and comparative examples of the present invention; Figure 6 The mechanical strength characteristics of the embodiments and comparative examples of the present invention; Figure 7 The wash resistance of the embodiments and comparative examples of the present invention; Figure 8 This is a comparison of the wash resistance of the embodiments and comparative examples of the present invention; Figure 9 This is a comparison of the UPF value and contact cooling coefficient performance of the embodiments and comparative examples of the present invention; Figure 10 This is a comparison of the UVA and UVB transmittance performance of the embodiments and comparative examples of the present invention; Figure 11 This is a comparison of the UPF retention rate @50 washing performance of the embodiments and comparative examples of the present invention. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0021] Example 1 A directional moisture-wicking, breathable, and quick-drying fabric comprises a three-layer composite structure consisting of an outer composite, a middle layer, and an inner layer arranged sequentially from the outside to the inside. In this embodiment, the outer composite is formed by bonding a thermoplastic polyurethane film to a knitted fabric, with the thermoplastic polyurethane film located on the outer side of the knitted fabric. The thermoplastic polyurethane film undergoes a single-sided contact heating process for heat orientation treatment, resulting in the directional enrichment of hydrophilic blocks and forming a gradient wetting structure where the side bonded to the knitted fabric is hydrophilic and the side away from the knitted fabric is hydrophobic. Furthermore, the thermoplastic polyurethane film has a permeable array of micropores / microslits, allowing the fabric to simultaneously possess water vapor permeability and air permeability, and these micropores / microslits remain interconnected after coating and lamination. The middle layer in this embodiment is a hydrophilic nonwoven fabric. The inner layer is a hydrophilically treated knitted fabric. The three layers in this embodiment are laminated using a hot melt adhesive dot-matrix network. The preparation method of the thermoplastic polyurethane film in this embodiment includes the following steps: A1. The thermoplastic polyurethane resin and polyethylene glycol-polytetrahydrofuran diol block copolymer are mixed evenly and then melt-blended in a twin-screw extruder at a temperature of 185°C, with the extrusion screw speed at 100 rpm; A2. The film is cast into a film through a T-die, with the die outlet temperature at 190°C and the film thickness controlled at 12 μm. The film is then cooled and shaped using a three-roll cooling system at a temperature of 52°C; A3. The thermoplastic polyurethane film of this embodiment undergoes a heat orientation treatment using a single-sided contact heating method at a temperature of 132°C. At ℃ for 11 minutes, a single-sided contact heating plate was used to achieve directional enrichment of hydrophilic blocks. The contact pressure was 0.2 MPa, forming a gradient wettability distribution with the side of the knitted fabric being hydrophilic and the side away from the knitted fabric being hydrophobic. A4. After step A3, the thermoplastic polyurethane film was microporousized to form an array of micropores / microslits that spanned the film thickness. A5. A low surface energy coating containing hydrophobic groups was coated on the hydrophobic surface at a coating amount of 0.9 g / m², which was determined by the dry weight method. The micropores / microslits remained continuous after coating. The microporous treatment in this embodiment is a needle roller microporous treatment. The needle roller in this embodiment has a regular array of microneedles, which allows the thermoplastic polyurethane film to pass through the hot-pressing zone between the needle roller and the support roller under the conditions of a film surface temperature of 90°C and a linear pressure of 75 N / mm. This forms a discrete, interconnected array of micropores / microslits with a through-hole diameter of 350 μm, a hole spacing of 1.0 mm, and a low porosity on the film, and the interconnectedness is maintained after subsequent coating. In this embodiment, the mass ratio of thermoplastic polyurethane resin to polyethylene glycol-polytetrahydrofuran diol block copolymer is 93.5:6.5.

[0022] The preparation method of the polyethylene glycol-polytetrahydrofuran diol block copolymer in this embodiment includes the following steps: B1. Raw material pretreatment: Polyethylene glycol with a molecular weight of 500 and polytetrahydrofuran diol with a molecular weight of 800 are mixed at a molar ratio of 1:1.5 and dried separately at a temperature of 95℃ and under reduced pressure for 1.5 h to obtain dehydrated polyethylene glycol and polytetrahydrofuran diol. B2. Prepolymerization reaction: Under an inert atmosphere, the polytetrahydrofuran diol obtained in step B1 was reacted with hexamethylene diisocyanate at a molar ratio of NCO groups to OH groups of 2.12. Dibutyltin dilaurate catalyst was added at an amount of 120 ppm, and the reaction was carried out at a temperature of 78°C for 1.2 h to obtain the NCO-terminated prepolymer. B3. Hydroxyl end-capping and block formation: At a temperature of 80°C, the polyethylene glycol obtained in step B1 was reacted at a molar ratio of OH groups to NCO groups of 1.06, and then added to the prepolymer obtained in step B2 and reacted for another 2 hours to obtain polyethylene glycol-polytetrahydrofuran hydroxyl end-capped block diols linked by urethane bonds. B4. Deviation and Refining: The reaction product obtained in step B3 was subjected to volatile removal at 90°C and 1 kPa absolute pressure, followed by hot filtration to obtain a polyethylene glycol-polytetrahydrofuran diol block copolymer with a hydroxyl value of 84 mg KOH / g and a corresponding number-average molecular weight of 1500. The coating steps for the low surface energy coating in this embodiment include: C1. Dissolving the methyl methacrylate-butyl acrylate copolymer in toluene solvent to prepare a coating solution with a solid content of 11%; C2. Coating the hydrophobic surface of the thermoplastic polyurethane film using a doctor blade coating method, with a doctor blade tilt angle of 37° and a coating speed of 10 m / min; C3. Controlling the coating amount to 0.9 g / m², the coating amount was determined by dry weight method, and precise control was achieved by adjusting the doctor blade gap and the coating solution concentration; C4. Curing at 157°C for 3.5 min to form a uniform low surface energy coating. In this embodiment, the outer knitted fabric is a warp-knitted fabric woven from polyester fibers; the middle hydrophilic nonwoven fabric is a spunlace nonwoven fabric made of polyvinyl alcohol fibers and polyester fibers mixed in a mass ratio of 3.5:6.5; the inner knitted fabric, which has undergone hydrophilic finishing, is a plain knitted fabric woven from polyester fibers, treated with polyethylene glycol monomethyl ether hydrophilic finishing agent, with an areal density of 150 g / m². The preparation method of this embodiment includes the following steps: S1. Preparation of outer composite: The hydrophilic surface of the thermoplastic polyurethane film is bonded to the knitted fabric, with the thermoplastic polyurethane film located on the outside of the knitted fabric. Dot-matrix hot-pressing is used, with the composite area accounting for 30% of the total area and the spacing between composite dots being 7.5 mm. The composite is carried out at a temperature of 130°C and a pressure of 0.35 MPa for 2 minutes to form the outer composite; S2. Preparation of intermediate layer: A hydrophilic nonwoven fabric with a surface density of 60 g / m² is selected as the intermediate layer; S3. Preparation of inner layer: A knitted fabric that has undergone hydrophilic treatment is selected as the inner layer; S4. Three-layer integral composite: The knitted fabric surface of the outer composite, the hydrophilic nonwoven fabric of the intermediate layer, and the knitted fabric of the inner layer are stacked in sequence, with the outer composite on the outermost side and the thermoplastic polyurethane film facing outward. The composite is carried out by hot-pressing with a copolyester hot melt adhesive dot mesh at a temperature of 145°C and a pressure of 0.2 MPa for 3.5 minutes to form a three-layer integral composite fabric. In step S4 of this embodiment, the diameter of the copolyester hot melt adhesive dots is 0.55 mm, the area coverage is 20%, and the melting temperature of the hot melt adhesive is 140°C.

[0023] Features of Example 1: This example uses moderate parameter configuration, focuses on process stability and reproducibility, is suitable for standard sportswear and everyday sportswear, has good moisture-wicking and breathability balance, mild process conditions, moderate production cost, and is suitable for large-scale industrial production.

[0024] Example 2 A directional moisture-wicking, breathable, and quick-drying fabric comprises a three-layer composite structure consisting of an outer composite, a middle layer, and an inner layer arranged sequentially from the outside to the inside. In this embodiment, the outer composite is formed by bonding a thermoplastic polyurethane film to a knitted fabric, with the thermoplastic polyurethane film located on the outer side of the knitted fabric. The thermoplastic polyurethane film undergoes a single-sided contact heating process for heat orientation treatment, resulting in the directional enrichment of hydrophilic blocks and forming a gradient wetting structure where the side bonded to the knitted fabric is hydrophilic and the side away from the knitted fabric is hydrophobic. Furthermore, the thermoplastic polyurethane film has a permeable array of micropores / microslits, allowing the fabric to simultaneously possess water vapor permeability and air permeability, and these micropores / microslits remain interconnected after coating and lamination. The middle layer in this embodiment is a hydrophilic nonwoven fabric. The inner layer is a hydrophilically treated knitted fabric. The three layers in this embodiment are laminated using a hot melt adhesive dot-matrix network. The preparation method of the thermoplastic polyurethane film in this embodiment includes the following steps: A1. The thermoplastic polyurethane resin and polyethylene glycol-polytetrahydrofuran diol block copolymer are mixed evenly and then melt-blended in a twin-screw extruder at a temperature of 180°C, with the extrusion screw speed at 120 rpm; A2. The film is cast into a film through a T-die, with the die outlet temperature at 185°C and the film thickness controlled at 10 μm. The film is then cooled and shaped using a three-roll cooling system at a temperature of 45°C; A3. The thermoplastic polyurethane film of this embodiment is subjected to heat orientation treatment using a single-sided contact heating method at a temperature of 145°C. At ℃ for 15 minutes, a single-sided contact heating plate was used to achieve directional enrichment of hydrophilic blocks. The contact pressure was 0.3 MPa, forming a gradient wettability distribution with the side of the knitted fabric being hydrophilic and the side away from the knitted fabric being hydrophobic. A4. After step A3, the thermoplastic polyurethane film was microporousized to form an array of micropores / microslits that spanned the film thickness. A5. A low surface energy coating containing hydrophobic groups was coated on the hydrophobic surface at a coating amount of 1.2 g / m², determined by the dry weight method, and the micropores / microslits remained continuous after coating. The microporous treatment in this embodiment is a needle roller microporous treatment. The needle roller in this embodiment has a regular array of microneedles, allowing the thermoplastic polyurethane film to pass through the hot-pressing zone between the needle roller and the support roller under a film surface temperature of 85°C and a linear pressure of 95 N / mm. This forms a discrete, interconnected array of micropores / microslits with a through-hole diameter of 240 μm, a pore spacing of 0.9 mm, and a low porosity, which remains interconnected after subsequent coating. The hydrophobic surface in this embodiment is coated with a low surface energy coating containing hydrophobic groups at a mass of 1.2 g / m², and the coating amount is determined by dry weight method. The mass ratio of thermoplastic polyurethane resin to polyethylene glycol-polytetrahydrofuran diol block copolymer in this embodiment is 92:8.

[0025] The preparation method of the polyethylene glycol-polytetrahydrofuran diol block copolymer in this embodiment includes the following steps: B1. Raw material pretreatment: Polyethylene glycol with a molecular weight of 450 and polytetrahydrofuran diol with a molecular weight of 900 are mixed in a molar ratio of 1:1.8 and dried separately at 105℃ under reduced pressure for 1 hour to obtain dehydrated polyethylene glycol and polytetrahydrofuran diol. B2. Prepolymerization reaction: Under an inert atmosphere, the polytetrahydrofuran diol obtained in step B1 was reacted with hexamethylene diisocyanate at a molar ratio of NCO groups to OH groups of 2.18. Dibutyltin dilaurate catalyst was added at an amount of 180 ppm, and the reaction was carried out at a temperature of 82°C for 0.8 h to obtain the NCO-terminated prepolymer. B3. Hydroxyl end-capping and block formation: At a temperature of 75°C, the polyethylene glycol obtained in step B1 was reacted at a molar ratio of OH groups to NCO groups of 1.08, and then added to the prepolymer obtained in step B2 and reacted for another 2.5 h to obtain polyethylene glycol-polytetrahydrofuran hydroxyl end-capped block diol linked by urethane bonds. B4. Volatilization and purification: The reaction product obtained in step B3 was subjected to volatile removal at 95°C and 0.8 kPa absolute pressure and then hot filtered to obtain a polyethylene glycol-polytetrahydrofuran diol block copolymer with a hydroxyl value of 68 mg KOH / g and a corresponding number-average molecular weight of 1800.

[0026] The coating steps for the low surface energy coating in this embodiment include: C1. Dissolving methyl methacrylate-butyl acrylate copolymer in methyl ethyl ketone solvent to prepare a coating solution with a solid content of 15%; C2. Coating the hydrophobic surface of the thermoplastic polyurethane film using a doctor blade coating method, with a doctor blade tilt angle of 45° and a coating speed of 15 m / min; C3. Controlling the coating amount to 1.2 g / m², the coating amount is determined by the dry weight method, and precise control is achieved by adjusting the doctor blade gap and the concentration of the coating solution; C4. Curing at 165°C for 5 min to form a uniform low surface energy coating. In this embodiment, the outer knitted fabric is a weft-knitted fabric woven from polyamide fibers; the middle hydrophilic nonwoven fabric is a needle-punched nonwoven fabric made by mixing polyvinyl alcohol fibers and polyester fibers in a mass ratio of 5:5; the inner hydrophilic-treated knitted fabric is a rib-knitted fabric woven from polyamide fibers, treated with a hydroxyethyl cellulose hydrophilic finishing agent, with an areal density of 200 g / m². The preparation method of this embodiment includes the following steps: S1. Preparation of outer composite: The hydrophilic surface of the thermoplastic polyurethane film is bonded to the knitted fabric, with the thermoplastic polyurethane film located on the outside of the knitted fabric. Strip hot pressing is used for bonding, with the bonding area accounting for 40% of the total area and the bonding point spacing being 5 mm. The bonding is carried out at a temperature of 140℃ and a pressure of 0.5 MPa for 3 minutes to form the outer composite; S2. Preparation of intermediate layer: A hydrophilic nonwoven fabric with a surface density of 80 g / m² is selected as the intermediate layer; S3. Preparation of inner layer: A knitted fabric that has undergone hydrophilic treatment is selected as the inner layer; S4. Three-layer integral bonding: The knitted fabric surface of the outer composite, the hydrophilic nonwoven fabric of the intermediate layer, and the knitted fabric of the inner layer are stacked in sequence, with the outer composite on the outermost side and the thermoplastic polyurethane film facing outward. The three-layer integral composite is formed by hot pressing with a copolyester hot melt adhesive dotted network at a temperature of 150℃ and a pressure of 0.3 MPa for 5 minutes. In step S4 of this embodiment, the diameter of the copolyester hot melt adhesive dots is 0.8 mm, the area coverage is 25%, and the melting temperature of the hot melt adhesive is 150°C.

[0027] Features of Example 2: This example adopts a high-strength moisture-wicking optimized configuration, with sufficient heat-oriented treatment conditions, the thickest hydrophobic coating, and a high proportion of polyvinyl alcohol fiber. It is specifically designed to enhance unidirectional moisture-wicking performance and is suitable for high-intensity sports equipment, professional competitive clothing, and extreme sports apparel. It has excellent rapid moisture wicking and dry-keeping capabilities.

[0028] Example 3 A directional moisture-wicking, breathable, and quick-drying fabric comprises a three-layer composite structure consisting of an outer composite, a middle layer, and an inner layer arranged sequentially from the outside to the inside. In this embodiment, the outer composite is formed by bonding a thermoplastic polyurethane film to a knitted fabric, with the thermoplastic polyurethane film located on the outer side of the knitted fabric. The thermoplastic polyurethane film undergoes a single-sided contact heating process for heat orientation treatment, resulting in the directional enrichment of hydrophilic blocks and forming a gradient wetting structure where the side bonded to the knitted fabric is hydrophilic and the side away from the knitted fabric is hydrophobic. Furthermore, the thermoplastic polyurethane film has a permeable array of micropores / microslits, allowing the fabric to simultaneously possess water vapor permeability and air permeability, and these micropores / microslits remain interconnected after coating and lamination. The middle layer in this embodiment is a hydrophilic nonwoven fabric. The inner layer is a hydrophilically treated knitted fabric. The three layers in this embodiment are laminated using a hot melt adhesive dot-matrix network. The preparation method of the thermoplastic polyurethane film in this embodiment includes the following steps: A1. The thermoplastic polyurethane resin and polyethylene glycol-polytetrahydrofuran diol block copolymer are mixed evenly and then melt-blended in a twin-screw extruder at a temperature of 190°C and an extrusion screw speed of 80 rpm; A2. The film is cast into a film through a T-die at a die outlet temperature of 195°C and a film thickness of 15 μm, and then cooled and shaped by a three-roll cooling system at a temperature of 60°C; A3. The thermoplastic polyurethane film of this embodiment is subjected to heat orientation treatment by a single-sided contact heating method at a temperature of 120°C. At ℃ for 8 minutes, a single-sided contact heating plate was used to achieve directional enrichment of hydrophilic blocks. The contact pressure was 0.1 MPa, forming a gradient wettability distribution with the side of the knitted fabric being hydrophilic and the side away from the knitted fabric being hydrophobic. A4. After step A3, the thermoplastic polyurethane film was microporousized to form an array of micropores / microslits that spanned the film thickness. A5. A low surface energy coating containing hydrophobic groups was coated on the hydrophobic surface at a coating amount of 0.6 g / m², which was determined by the dry weight method. The micropores / microslits remained interconnected after coating. The microporous treatment in this embodiment is a needle roller microporous treatment. The needle roller in this embodiment has a regular array of microneedles, which allows the thermoplastic polyurethane film to pass through the hot-pressing zone between the needle roller and the support roller under the conditions of a film surface temperature of 100°C and a linear pressure of 65 N / mm, forming a discrete, interconnected array of micropores / microslits with a through-hole diameter of 420 μm, a hole spacing of 1.1 mm, and a low porosity, and maintaining this interconnectivity after subsequent coating. In this embodiment, the mass ratio of thermoplastic polyurethane resin to polyethylene glycol-polytetrahydrofuran diol block copolymer is 95:5.

[0029] The preparation method of the polyethylene glycol-polytetrahydrofuran diol block copolymer in this embodiment includes the following steps: B1. Raw material pretreatment: Polyethylene glycol with a molecular weight of 580 and polytetrahydrofuran diol with a molecular weight of 700 were mixed at a molar ratio of 1:1.2 and dried separately at a temperature of 88℃ under reduced pressure for 2 hours to obtain dehydrated polyethylene glycol and polytetrahydrofuran diol. B2. Prepolymerization reaction: Under an inert atmosphere, the polytetrahydrofuran diol obtained in step B1 was reacted with hexamethylene diisocyanate at a molar ratio of NCO groups to OH groups of 2.07. Dibutyltin dilaurate catalyst was added at an amount of 80 ppm, and the reaction was carried out at a temperature of 75°C for 1.8 h to obtain the NCO-terminated prepolymer. B3. Hydroxyl end-capping and block formation: At a temperature of 85°C, the polyethylene glycol obtained in step B1 was reacted at a molar ratio of OH groups to NCO groups of 1.04, and then added to the prepolymer obtained in step B2 and reacted for another 1.5 h to obtain polyethylene glycol-polytetrahydrofuran hydroxyl end-capped block diol linked by urethane bonds. B4. Volatilization and purification: The reaction product obtained in step B3 was subjected to volatile removal at 85°C and 0.5 kPa absolute pressure and then hot filtered to obtain a polyethylene glycol-polytetrahydrofuran diol block copolymer with a hydroxyl value of 95 mg KOH / g and a corresponding number-average molecular weight of 1200.

[0030] The coating steps for the low surface energy coating in this embodiment include: C1. Dissolving methyl methacrylate-butyl acrylate copolymer in toluene solvent to prepare a coating solution with a solid content of 8%; C2. Coating the hydrophobic surface of the thermoplastic polyurethane film using a doctor blade coating method, with a doctor blade tilt angle of 30° and a coating speed of 5 m / min; C3. Controlling the coating amount to 0.6 g / m², the coating amount is determined by the dry weight method, and precise control is achieved by adjusting the doctor blade gap and the concentration of the coating solution; C4. Curing at 150°C for 2 min to form a uniform low surface energy coating. In this embodiment, the outer knitted fabric is a weft-knitted fabric woven from polyester fibers; the middle hydrophilic nonwoven fabric is a spunlace nonwoven fabric made by mixing polyvinyl alcohol fibers and polyester fibers in a mass ratio of 2:8; the inner hydrophilic-treated knitted fabric is a plain knitted fabric woven from polyester fibers, treated with polyethylene glycol monomethyl ether hydrophilic finishing agent, with an areal density of 100 g / m². The preparation method of this embodiment includes the following steps: S1. Preparation of outer composite: The hydrophilic surface of the thermoplastic polyurethane film is bonded to the knitted fabric, with the thermoplastic polyurethane film located on the outside of the knitted fabric. Dot-matrix hot-pressing is used, with the composite area accounting for 20% of the total area and the spacing between composite dots being 10 mm. The composite is carried out at 120°C and 0.2 MPa for 1 min to form the outer composite; S2. Preparation of intermediate layer: A hydrophilic nonwoven fabric with a surface density of 40 g / m² is selected as the intermediate layer; S3. Preparation of inner layer: A knitted fabric treated with hydrophilic finishing is selected as the inner layer; S4. Three-layer integral composite: The knitted fabric surface of the outer composite, the hydrophilic nonwoven fabric of the intermediate layer, and the knitted fabric of the inner layer are stacked in sequence, with the outer composite on the outermost side and the thermoplastic polyurethane film facing outward. The composite is carried out by hot-pressing with a copolyester hot melt adhesive dot mesh at 140°C and 0.1 MPa for 2 min to form a three-layer integral composite fabric. In step S4 of this embodiment, the diameter of the copolyester hot melt adhesive dots is 0.3 mm, the area coverage is 15%, and the melting temperature of the hot melt adhesive is 130°C.

[0031] Features of Example 3: This example adopts a lightweight and breathable optimized configuration, focusing on maximizing breathability. It has the lowest hot melt adhesive coverage, a large film thickness but the smallest composite area, and the lightest surface density of hydrophilic non-woven fabric. It is specially designed to enhance breathability and comfort, and is suitable for lightweight sportswear, summer sports equipment and outdoor leisure clothing with high breathability requirements. It has excellent breathability, comfort and light feel.

[0032] Example 4 A directional moisture-wicking, breathable, and quick-drying fabric comprises a three-layer composite structure consisting of an outer composite, a middle layer, and an inner layer arranged sequentially from the outside to the inside. In this embodiment, the outer composite is formed by bonding a thermoplastic polyurethane film to a knitted fabric, with the thermoplastic polyurethane film located on the outer side of the knitted fabric. The thermoplastic polyurethane film undergoes a single-sided contact heating process for heat orientation treatment, resulting in the directional enrichment of hydrophilic blocks and forming a gradient wetting structure where the side bonded to the knitted fabric is hydrophilic and the side away from the knitted fabric is hydrophobic. Furthermore, the thermoplastic polyurethane film has a permeable array of micropores / microslits, allowing the fabric to simultaneously possess water vapor permeability and air permeability, and these micropores / microslits remain interconnected after coating and lamination. The middle layer in this embodiment is a hydrophilic nonwoven fabric. The inner layer is a hydrophilically treated knitted fabric. The three layers in this embodiment are laminated using a hot melt adhesive dot-matrix network. The preparation method of the thermoplastic polyurethane film in this embodiment includes the following steps: A1. The thermoplastic polyurethane resin and polyethylene glycol-polytetrahydrofuran diol block copolymer are mixed evenly and then melt-blended in a twin-screw extruder at a temperature of 188°C, with the extrusion screw speed at 90 rpm; A2. The film is cast into a film through a T-die, with the die outlet temperature at 192°C and the film thickness controlled at 13 μm. The film is then cooled and shaped using a three-roll cooling system at a temperature of 55°C; A3. The thermoplastic polyurethane film of this embodiment is subjected to heat orientation treatment using a single-sided contact heating method at a temperature of 138°C. The heating process takes 12 minutes and uses a single-sided contact heating plate to achieve directional enrichment of hydrophilic blocks. The contact pressure is 0.25 MPa, forming a gradient wettability distribution with the side of the knitted fabric being hydrophilic and the side away from the knitted fabric being hydrophobic. A4. After step A3, the thermoplastic polyurethane film is microporousized to form an array of micropores / microslits that span the film thickness. A5. A low surface energy coating containing hydrophobic groups is coated on the hydrophobic surface at a coating amount of 0.8 g / m², which is determined by the dry weight method. The micropores / microslits remain interconnected after coating. The microporous treatment in this embodiment is needle roller microporous treatment. The needle roller in this embodiment has a regular microneedle array, which allows the thermoplastic polyurethane film to pass through the hot pressing zone between the needle roller and the support roller under the film surface temperature of 100°C and the linear pressure of 65N / mm, forming a discrete through-hole / micro-slit array with a through-hole diameter of 350μm, a hole spacing of 1.1mm and a low porosity, and maintaining the through-hole after subsequent coating.

[0033] The preparation method of the polyethylene glycol-polytetrahydrofuran diol block copolymer in this embodiment includes the following steps: B1. Raw material pretreatment: Polyethylene glycol with a molecular weight of 400 and polytetrahydrofuran diol with a molecular weight of 1000 are mixed at a molar ratio of 1:2.0 and dried separately at a temperature of 110℃ and under reduced pressure for 1 hour to obtain dehydrated polyethylene glycol and polytetrahydrofuran diol. B2. Prepolymerization reaction: Under an inert atmosphere, the polytetrahydrofuran diol obtained in step B1 was reacted with hexamethylene diisocyanate at a molar ratio of NCO groups to OH groups of 2.20. Dibutyltin dilaurate catalyst was added at an amount of 200 ppm, and the reaction was carried out at a temperature of 70°C for 2 h to obtain the NCO-terminated prepolymer. B3. Hydroxyl end-capping and block formation: At a temperature of 90°C, the polyethylene glycol obtained in step B1 was reacted at a molar ratio of OH groups to NCO groups of 1.10, and then added to the prepolymer obtained in step B2 and reacted for another 1 hour to obtain polyethylene glycol-polytetrahydrofuran hydroxyl end-capped block diols linked by urethane bonds. B4. Deviation and purification: The reaction product obtained in step B3 was subjected to volatile removal at 100°C and 0.3 kPa absolute pressure and then hot filtered to obtain a polyethylene glycol-polytetrahydrofuran diol block copolymer with a hydroxyl value of 56 mg KOH / g and a corresponding number-average molecular weight of 2000.

[0034] In this embodiment, the mass ratio of thermoplastic polyurethane resin to polyethylene glycol-polytetrahydrofuran diol block copolymer is 94:6. The coating steps of the low surface energy coating in this embodiment include: C1. Dissolving methyl methacrylate-butyl acrylate copolymer in methyl ethyl ketone solvent to prepare a coating solution with a solid content of 12%; C2. Coating the hydrophobic surface of the thermoplastic polyurethane film using a doctor blade coating method, with the doctor blade tilt angle at 40° and the coating speed at 12 m / min; C3. Controlling the coating amount to 0.8 g / m², the coating amount is determined by dry weight method, and precise control is achieved by adjusting the doctor blade gap and the coating solution concentration; C4. Curing at 160°C for 4 min to form a uniform low surface energy coating. In this embodiment, the outer knitted fabric is a warp-knitted fabric woven from polyamide fibers; the middle hydrophilic nonwoven fabric is a needle-punched nonwoven fabric made of polyvinyl alcohol fibers and polyester fibers mixed in a mass ratio of 4:6; and the inner knitted fabric treated with hydrophilic finishing is a rib-knitted fabric woven from polyamide fibers, treated with hydroxyethyl cellulose hydrophilic finishing agent, with an areal density of 175 g / m². The preparation method of this embodiment includes the following steps: S1. Preparation of outer composite: The hydrophilic surface of the thermoplastic polyurethane film is bonded to the knitted fabric, with the thermoplastic polyurethane film located on the outside of the knitted fabric. Strip hot pressing is used for bonding, with the bonding area accounting for 35% of the total area and the bonding point spacing being 6 mm. The bonding is carried out at a temperature of 135℃ and a pressure of 0.4 MPa for 2.5 min to form the outer composite; S2. Preparation of intermediate layer: A hydrophilic nonwoven fabric with a surface density of 65 g / m² is selected as the intermediate layer; S3. Preparation of inner layer: A knitted fabric that has undergone hydrophilic treatment is selected as the inner layer; S4. Three-layer integral bonding: The knitted fabric surface of the outer composite, the hydrophilic nonwoven fabric of the intermediate layer, and the knitted fabric of the inner layer are stacked in sequence, with the outer composite on the outermost side and the thermoplastic polyurethane film facing outward. The three-layer integral composite fabric is formed by hot pressing with a copolyester hot melt adhesive dotted network at a temperature of 148℃ and a pressure of 0.25 MPa for 4 min. In step S4 of this embodiment, the diameter of the copolyester hot melt adhesive dots is 0.65 mm, the area coverage is 22%, and the melting temperature of the hot melt adhesive is 145°C.

[0035] Features of Example 4: This example adopts a comprehensive performance balance configuration, with parameters selected close to the upper limit while maintaining safety, relatively strict process conditions, and a high proportion of polyamide fibers. It is specifically designed for high durability and comprehensive functional balance, and is suitable for high-end outdoor equipment, multi-functional sportswear, and professional sports equipment for long-term use. It has excellent durability and comprehensive functional performance.

[0036] Comparative Example 1: It is basically the same as Example 1, except that the melt blending temperature in step A1 is 160°C, while other process conditions remain unchanged.

[0037] Comparative Example 2: It is basically the same as Example 1, except that the heat orientation treatment temperature in step A3 is 100°C, while the treatment time, contact pressure and other parameters remain unchanged.

[0038] Comparative Example 3: It is basically the same as Example 1, except that the heat orientation treatment time in step A3 is 5 minutes, while other parameters such as treatment temperature and contact pressure remain unchanged.

[0039] Comparative Example 4: It is basically the same as Example 1, except that the contact pressure in step A3 is 0.05 MPa, while other parameters such as treatment temperature and time remain unchanged.

[0040] Comparative Example 5: It is basically the same as Example 1, except that the amount of hydrophobic coating in step A4 is 0.3 g / m², while other coating process conditions remain unchanged.

[0041] Comparative Example 6: It is basically the same as Example 1, except that the mass ratio of thermoplastic polyurethane resin to polyethylene glycol-polytetrahydrofuran diol block copolymer in step A1 is 98:2, and other preparation conditions remain unchanged.

[0042] Comparative Example 7: Basically the same as Example 1, except that the molar ratio of polyethylene glycol to polytetrahydrofuran diol in step B1 is 1:0.5, and other conditions remain unchanged.

[0043] Comparative Example 8: Basically the same as Example 1, except that the molar ratio of polyethylene glycol to polytetrahydrofuran diol in step B1 is 1:0.8, and the molar ratio of OH groups to NCO groups in step B3 is adjusted to 1.03.

[0044] Comparative Example 9: It is basically the same as Example 1, except that the coating curing temperature in step C4 is 130°C, while the curing time and other coating conditions remain unchanged.

[0045] Comparative Example 10: It is basically the same as Example 1, except that the mass ratio of polyvinyl alcohol fiber to polyester fiber in the hydrophilic nonwoven fabric of the middle layer is 1:9, while the composition of other materials remains unchanged.

[0046] Comparative Example 11: It is basically the same as Example 1, except that the composite area accounts for 10% of the total area in step S1, and the spacing between composite points and other hot-pressing composite conditions remain unchanged.

[0047] Comparative Example 12: It is basically the same as Example 1, except that the hot pressing temperature in step S1 is 100°C, while other parameters such as pressure and bonding time remain unchanged.

[0048] Comparative Example 13: It is basically the same as Example 1, except that the hot pressing pressure in step S4 is 0.05 MPa, while the other conditions such as the composite temperature and time remain unchanged.

[0049] Comparative Example 14: Basically the same as Example 1, except that in step S4 the area coverage of the polyester hot melt adhesive dot network is 5%, while other parameters such as dot diameter and melting temperature remain unchanged.

[0050] Comparative Example 15: It is basically the same as Example 1, except that the thermal orientation treatment in step A3 is not performed, and the hydrophobic coating in step A4 is applied directly. Other preparation steps and process conditions remain unchanged.

[0051] Performance Testing: Moisture-wicking Performance Test: The test object is a finished product of directional moisture-wicking, breathable, and quick-drying fabric. Test Objective: To evaluate the fabric's unidirectional moisture-wicking capacity and moisture-wicking rate, and to verify the moisture-wicking effect of the gradient wetting structure. Test Principle: Based on the transport behavior of liquid in porous materials under capillary effect and gravity, the moisture-wicking performance is evaluated by measuring the diffusion area and transport time of the liquid in the fabric. Experimental Method: The fabric sample is placed horizontally on a test rack. A quantitative amount of standard test solution (distilled water or simulated sweat) is added dropwise from the center of the fabric. The change in the diffusion area of ​​the liquid on both sides of the fabric over time is recorded, and the time required for the liquid to be completely transported to the other side of the fabric is measured. Standard Basis: Refer to GB / T21655.1-2008. Key Parameters: The test environment temperature is 20±2℃, the relative humidity is 65±4%, the test liquid volume is 0.2mL, the recording time interval is 30 seconds, and the test duration is 10 minutes. Data processing: Calculate the unidirectional transport index, moisture absorption rate, and wetting radius, and evaluate the unidirectional moisture conduction effect by the ratio of the wetting area on the front and back sides.

[0052] Air permeability test: The test object is a finished product of a directional moisture-wicking, breathable, and quick-drying fabric. Test objective: To determine the air permeability of the fabric and evaluate the impact of the three-layer composite structure on gas flow. Test principle: Under specified pressure differential conditions, the volume of airflow passing vertically through a unit area sample per unit time is measured, reflecting the fabric's air permeability resistance. Experimental method: The fabric sample is clamped onto the test head of the air permeability tester, ensuring a good seal. A stable airflow is introduced under a pressure differential of 100 Pa, and the airflow rate through the fabric is measured to calculate the air permeability rate. Standard basis: According to GB / T 5453-1997 "Determination of Air Permeability of Textile Fabrics", key parameters are: test area 20 cm², pressure differential 100 Pa, test ambient temperature 20 ± 2℃, relative humidity 65 ± 4%, and at least 5 test points for each sample. Data processing: The average air permeability rate is calculated and the standard deviation is given, expressed in mm / s, to evaluate the fabric's breathability and comfort.

[0053] Quick-drying performance test: The test object is a finished product of a directional moisture-wicking, breathable, and quick-drying fabric. Test objective: To evaluate the fabric's rapid drying ability and determine the time required for the fabric to recover from a wet state to a dry state. Test principle: By controlling the moisture evaporation process under environmental conditions, the change in fabric moisture content over time is measured to evaluate the drying rate. Experimental method: After the fabric sample is completely wetted, it is weighed and the initial wet weight is recorded. Then, it is naturally dried under standard environmental conditions, and weighed every 5 minutes until the difference between two consecutive weighings is less than 0.1%. The weight change at each time point is recorded. Standard basis: Refer to GB / T21655.2-2009 "Evaluation of the moisture absorption and quick-drying properties of textiles - Part 2: Dynamic moisture transfer method". Key parameters: The test environment temperature is 20±2℃, the relative humidity is 65±4%, the wind speed is 1.0±0.2m / s, the sample size is 10cm×10cm, and the initial moisture content is 100%. Data processing: The drying rate constant and 90% drying time are calculated, a drying curve is plotted, and the quick-drying performance level of the fabric is evaluated.

[0054] Surface Wettability Test: The test object is the front and back sides of a directional moisture-wicking, breathable, and quick-drying fabric. Test Objective: To determine the difference in contact angle between the front and back sides of the fabric and verify the formation effect of the gradient wetting structure. Test Principle: Based on the wetting behavior of a liquid on a solid surface, the hydrophilicity / hydrophobicity of the surface is evaluated by measuring the contact angle of water droplets on the fabric surface. Experimental Method: Using a contact angle meter, 2 μL of distilled water is dropped onto both sides of the fabric. The droplet morphology is photographed within 2 seconds after the droplet is dropped, and the contact angle value is measured. At least 10 points are tested on each side. Standard Basis: Performed according to ASTM D7334-08. Key Parameters: The test environment temperature is 23±2℃, the relative humidity is 50±5%, the droplet volume is 2±0.1μL, the measurement time is 2 seconds after the droplet is dropped, and the distance between test points is not less than 1cm. Data Processing: The average value and standard deviation of the contact angles of the front and back sides are calculated. The gradient wetting effect is evaluated by the difference in contact angles. A contact angle less than 90° is considered hydrophilic, and a contact angle greater than 90° is considered hydrophobic.

[0055] Tensile Strength Test: The test object is a finished product of a moisture-wicking, breathable, and quick-drying fabric. Test Objective: To evaluate the mechanical strength and elongation at break of the fabric, and to verify the mechanical stability of the three-layer composite structure. Test Principle: A gradually increasing tensile load is applied to the fabric using a tensile testing machine until the fabric breaks. The maximum tensile force and elongation at break are recorded. Experimental Method: A standard tensile specimen is prepared, clamped in the tensile testing machine, and the tensile speed is set to 100 mm / min. A tensile load is continuously applied until the specimen breaks, and the breaking strength and elongation at break are recorded. Standard Basis: Compliance with GB / T 3923.1-2013. Key Parameters: Specimen size: 200 mm × 50 mm; clamping distance: 100 mm; tensile speed: 100 ± 10 mm / min; pretension: 2 N; test environment: standard atmospheric conditions. Data Processing: The average values ​​of the warp and weft breaking strength and elongation at break are calculated to evaluate the mechanical property grade of the fabric and analyze the influence of the composite structure on the strength.

[0056] Washability Test: The test subject is a finished product of a moisture-wicking, breathable, and quick-drying fabric. Test Objective: To evaluate the durability of the fabric's functional properties and verify its ability to retain moisture-wicking and breathability after repeated washing. Test Principle: Through accelerated testing simulating actual washing conditions, the impact of washing on the fabric's structure and function is evaluated. Experimental Method: The fabric sample is subjected to multiple washing cycles according to a standard washing procedure. Moisture-wicking and breathability properties are tested after every 5 washes, and the performance changes before and after washing are compared. Standard Basis: Performed according to GB / T 8629-2017 "Testing Procedures for Household Washing and Drying of Textiles". Key Parameters: Washing temperature 40℃, washing time 45 minutes, detergent concentration 4g / L, spin-drying speed 800rpm, air drying, total number of washes 50. Data Processing: The performance retention rate after each wash is calculated, a performance degradation curve is plotted, and the functional durability level is evaluated.

[0057] UV Protection Performance Test: The test subject is a sample of moisture-wicking, breathable, and quick-drying fabric. Test Objective: To determine the UV Protection Factor (UPF) and UVA and UVB transmittance of the fabric, and to evaluate the fabric's UV protection effect. Test Principle: Based on the attenuation law of UV radiation passing through fabric, the protection factor is calculated by measuring the transmittance of the fabric to different wavelengths of UV radiation. Experimental Method: Using a UV transmittance meter, the fabric sample is laid flat on the test window, and the transmittance in the 280-315nm (UVB) and 315-400nm (UVA) bands is measured respectively. The UPF value is calculated based on the transmittance data. Five different parts of each sample are tested. Standard Basis: Performed in accordance with GB / T 18830-2009 "Evaluation of UV Protection Performance of Textiles". Key Parameters: The test environment temperature is 20±2℃, the relative humidity is 65±4%, the sample size is 50mm×50mm, the test beam diameter is 25mm, the integration time is 100ms, and the test point spacing is not less than 10mm. Data processing: Calculate the average value and standard deviation of UVA and UVB transmittance. Calculate the ultraviolet protection factor (UPF) according to the formula UPF=40 / T_UVA+T_UVB. A UPF value ≥40 indicates good protection, and a UPF value ≥50 indicates excellent protection.

[0058] Cooling Sensation Test: The test subject is a sample of directional moisture-wicking, breathable, and quick-drying fabric. Test Objective: To determine the instantaneous cooling sensation upon contact with skin, and to evaluate the fabric's thermal conductivity and wearing comfort. Test Principle: Based on the instantaneous heat transfer characteristics of materials upon contact with human skin, the cooling effect is quantified by measuring the material's thermal conductivity coefficient. Experimental Method: Using a cooling sensation tester, a test probe maintained at 35℃ is brought into contact with the fabric sample. The change in heat flow within 0.1 seconds of contact is recorded, and the cooling sensation coefficient is calculated. Eight different locations are tested for each sample. Standard Basis: Performed according to GB / T 35263-2017 "Test and Evaluation of Instantaneous Cooling Sensation Performance of Textiles". Key Parameters: Test ambient temperature: 20±2℃; relative humidity: 65±4%; probe temperature: 35±0.1℃; contact pressure: 100±10Pa; test time: 0.1 seconds; sample conditioning time: no less than 4 hours.

[0059] As can be seen from Tables 1-3, the performance degradation of each comparative example compared to the embodiment is mainly due to the combined effect of the following factors: Insufficient blending temperature leads to inadequate compatibility and dispersion of the TPU / block copolymer, resulting in interface defects and microphase separation, causing discontinuous moisture channels and decreased mechanical properties and washability; Insufficient thermal orientation temperature, time, or contact pressure fails to effectively drive the unilateral enrichment of hydrophilic blocks, weakening the surface energy gradient, reducing the contact angle difference between the front and back surfaces, significantly decreasing the unidirectional transport index, and exhibiting a tendency for backflow; Low hydrophobic coating quantity or insufficient curing reduces the hydrophobicity of the outer surface, coating density, solvent resistance, and abrasion resistance. Initially, breathability improved slightly, but moisture wicking and durability deteriorated simultaneously. The fabric's UV protection function was also weakened, with the UPF value decreasing from 149-156 in the examples to 118-140 in the comparative example. T(UVA) and T(UVB) transmittance increased significantly. Low hydrophilic block content or an imbalanced PEG / PTMG ratio in the formulation, along with a low polymerization temperature, resulted in insufficient block molecular weight and softness, weakening hydrophilic-hydrophobic synergy and chain segment migration ability. This manifested as a decrease in Δθ and diffusion rate, poorer film toughness and composite interface bonding, and a cooling coefficient decreasing from 0.19 to 0.22 in the examples. The J / (cm²·s) dropped to 0.14~0.17 J / (cm²·s) compared to the comparative example, affecting wearing comfort; the low PVA ratio in the middle layer weakened the capillary network and water storage-wicking capacity, resulting in unidirectional moisture wicking attenuation and increased backflow; insufficient temperature / pressure or low composite area and glue network coverage in the initial composite (S1) and final composite (S4) reduced the effective contact and continuous transmission channels between layers, which improved breathability to some extent, but at the cost of reduced peel strength, interrupted moisture wicking path and uneven function; the elimination of thermal orientation fundamentally destroyed the gradient wetting structure, resulting in similar wettability on both sides, the worst unidirectional moisture wicking, and a significant reduction in dryness retention and post-wash function retention. The UPF retention rate of the comparative example 15 was only 45%, and the contact cooling coefficient dropped to the lowest of 0.14 J / (cm²·s). The general rule is that any factor that weakens the surface energy gradient, the continuity of hydrophilic channels, the dense curing of the coating, and the effective interlayer bonding will cause a decrease in ODI and Δθ, an increase in backflow, and a deterioration in durability, while also leading to a decrease in UV protection performance and a reduction in cooling sensation. Conversely, slightly reducing the coverage or coating amount can bring a localized improvement in breathability and feel, but it is difficult to compensate for the loss of moisture wicking directionality, protective function, and long-term stability. The example, while maintaining excellent moisture wicking performance, achieved a good UV protection effect of UPF>140 and a good cooling sensation of ≥0.19 J / (cm²·s), demonstrating the important role of process optimization in multifunctional synergy.

[0060]

[0061]

[0062]

[0063] Figure 1 The invention demonstrates the unidirectional moisture-wicking mechanism of the fabric: the inner layer is a hydrophilic knitted fabric that quickly absorbs and spreads sweat; the middle layer is a hydrophilic nonwoven fabric that constructs continuous capillary channels to achieve longitudinal transmission and lateral diffusion of sweat; the outer layer is a TPU film / fabric structure combined with the knitted fabric, with the inner side of the film being hydrophilic and the outer side being hydrophobic, forming a surface energy gradient that promotes unidirectional migration of moisture from the skin side to the outer side and its spread and evaporation on the outer surface, thereby achieving a close-fitting dryness, breathability, quick-drying, and anti-backflow properties.

[0064] Figure 2 The images show the FTIR spectra of the hydrophobic surface, hydrophilic surface, and low surface energy coating of the thermoplastic polyurethane film in Example 1 of this invention. The differences in transmission FTIR between the three types of esters clearly characterize the surface chemical gradient and coating coverage effect. The hydrophilic surface exhibits stronger absorption at the C–O–C stretching band (≈1108–1125 cm⁻¹) and the hydrogen-bonded enhanced urethane C=O (≈1708–1715 cm⁻¹), with a wider N–H stretching band (≈3320 cm⁻¹), indicating enrichment of the hydrophilic block in the PEG / PTMG. The hydrophobic surface shows relatively stronger absorption at the free C=O (≈1722–1725 cm⁻¹) and CH₂ (≈2920 / 2850 cm⁻¹), reflecting a relative depletion of the hydrophilic block and an increase in the proportion of hard segments / hydrocarbon chains. After coating the hydrophobic surface with a low surface energy acrylate coating, the ester carbonyl peak (≈1730–1733 cm⁻¹) is significantly enhanced and sharper, while the high-wavelength C–O–C band of the ester (≈1240–1270 cm⁻¹) is also enhanced. The contribution of the matrix N–H and hydrogen bond C=O was significantly weakened, which comprehensively proves that the gradient structure from hydrophilic surface to hydrophobic surface to outer low surface energy coating and the complete coverage of the coating have been established.

[0065] based on Figure 3 The physical images clearly show that the thermoplastic polyurethane film of Example 2, after being treated with needle roller micropores, forms a regular and orderly micropore array structure. This physical evidence strongly supports the effectiveness and practicality of the technical solution of the present invention, laying a solid structural foundation for the realization of the function of directional moisture-wicking, breathable, and quick-drying fabrics.

[0066] Figures 4 to 8 This invention fully demonstrates its technical advantages, wherein Figure 4 The unidirectional transport index (ODI) and moisture absorption rate of Examples 1-4 are significantly higher than those of Comparative Examples 1-15, indicating that the present invention has excellent moisture-wicking function. Figure 5 The wetting radius and contact angle difference of the embodiment are better than those of the comparative example, which confirms the improved surface wetting properties; Figure 6 The demonstrated embodiment not only maintains high breathability but also has a shorter drying time, achieving a balance between breathability and quick-drying performance; Figure 7This demonstrates that the embodiment outperforms the comparative example in terms of breaking strength and elongation, ensuring excellent mechanical strength; Figure 8 This confirms that the embodiment can still maintain a high ODI retention rate and breathability retention rate after 50 washes, which is significantly better than the comparative example, demonstrating the excellent durability and practical value of the material of the present invention. Figures 9-11 The test results show that the embodiments of the present invention are significantly superior to the comparative examples in terms of UV protection and cooling sensation upon contact. The UPF value of the embodiments reaches 142-156, the cooling sensation coefficient upon contact is 0.19-0.22 J / (cm²·s), and the UVA and UVB transmittance are controlled below 2.65%-3.05% and 0.42%-0.52%, respectively. After 50 washes, the UPF retention rate remains at a high level of 85%-91%. In contrast, the UPF value of the comparative examples is only 118-140, the cooling sensation coefficient upon contact drops to 0.14-0.17 J / (cm²·s), the UV transmittance increases significantly, and the UPF retention rate after washing is as low as 45%. This indicates that the gradient wetting structure and dense coating formed by optimizing process parameters not only achieve excellent one-way moisture wicking function but also effectively improve the protective performance and wearing comfort of the fabric, demonstrating the technical advantages of multi-functional synergistic optimization.

[0067] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that any equivalent structural transformations made under the concept of the present invention and using the contents of the specification and drawings of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A directional moisture-wicking, breathable, and quick-drying fabric, characterized in that, The structure comprises a three-layer composite structure arranged sequentially from the outside to the inside: an outer composite layer, a middle layer, and an inner layer. The outer composite layer is formed by bonding a thermoplastic polyurethane film to a knitted fabric, with the thermoplastic polyurethane film located on the outer side of the knitted fabric. The thermoplastic polyurethane film undergoes a heat-oriented treatment via single-sided contact heating, resulting in the directional enrichment of hydrophilic blocks and forming a gradient wetting structure where the side bonded to the knitted fabric is hydrophilic and the side away from the knitted fabric is hydrophobic. Furthermore, the thermoplastic polyurethane film has a permeable array of micropores / microslits, allowing the fabric to simultaneously possess water vapor permeability and air permeability, and these micropores / microslits remain interconnected after coating and lamination. The middle layer is a hydrophilic nonwoven fabric, and the inner layer is a hydrophilically treated knitted fabric. The three layers are laminated together using a hot melt adhesive dot mesh.

2. The directional moisture-wicking, breathable, and quick-drying fabric as described in claim 1, characterized in that, The method for preparing the thermoplastic polyurethane film includes the following steps: A1. The thermoplastic polyurethane resin and polyethylene glycol-polytetrahydrofuran diol block copolymer are mixed evenly and then melt-blended in a twin-screw extruder at a temperature of 180-190℃, with the extrusion screw speed being 80-120 rpm. A2. Film is cast using a T-die, with the die outlet temperature at 185-195℃ and the film thickness controlled at 10-15μm. The film is then cooled and shaped using a three-roller cooling system, with the cooling roller temperature at 45-60℃. A3. The thermoplastic polyurethane film is subjected to heat orientation treatment by single-sided contact heating at a temperature of 120-145℃ for 8-15 minutes. The hydrophilic block is oriented and enriched by single-sided contact heating plate heating. The contact pressure is 0.1-0.3MPa, forming a gradient wettability distribution with the side of the fabric attached to the knitted fabric being hydrophilic and the side away from the knitted fabric being hydrophobic. A4. After step A3, the thermoplastic polyurethane film is subjected to microporous treatment to form an array of micropores / microslits that span the film thickness. A5. A low surface energy coating containing hydrophobic groups is applied to the hydrophobic surface. The coating amount is 0.6-1.2 g / m², and the coating amount is determined by the dry weight method. The micropores / microslits remain interconnected after coating.

3. The directional moisture-wicking, breathable, and quick-drying fabric as described in claim 2, characterized in that, The microporous treatment is a needle roller microporous treatment. The needle roller has a regular array of microneedles, which allows the thermoplastic polyurethane film to pass through the hot pressing zone between the needle roller and the support roller under the film surface temperature of 80–100°C and the linear pressure of 60–100 N / mm. This forms a discrete through-hole / micro-slit array with a through-hole diameter of 240–500 μm, a hole spacing of 0.8–1.2 mm, and a low porosity, and the array remains through-hole after subsequent coating.

4. The directional moisture-wicking, breathable, and quick-drying fabric as described in claim 2, characterized in that, The mass ratio of the thermoplastic polyurethane resin to the polyethylene glycol-polytetrahydrofuran diol block copolymer is 92-95:5-8.

5. The directional moisture-wicking, breathable, and quick-drying fabric as described in claim 2, characterized in that, The preparation method of the polyethylene glycol-polytetrahydrofuran diol block copolymer includes the following steps: B1. Raw material pretreatment: Polyethylene glycol with a molecular weight of 400-600 and polytetrahydrofuran diol with a molecular weight of 650-1000 are mixed at a molar ratio of 1:1.0-2.0 and dried separately at a temperature of 80-110℃ under reduced pressure for 1-2 hours to obtain dehydrated polyethylene glycol and polytetrahydrofuran diol. B2. Prepolymerization reaction: Under an inert atmosphere, the polytetrahydrofuran diol obtained in step B1 is reacted with hexamethylene diisocyanate at a molar ratio of NCO groups to OH groups of 2.05-2.

20. Dibutyltin dilaurate catalyst is added at an amount of 50-200 ppm, and the reaction is carried out at a temperature of 70-85℃ for 0.5-2 h to obtain NCO-terminated prepolymer. B3. Hydroxyl end-capping and block formation: At a temperature of 70-90℃, the polyethylene glycol obtained in step B1 is reacted at a molar ratio of OH groups to NCO groups of 1.02-1.10, and then added to the prepolymer obtained in step B2 and reacted for 1-3 hours to obtain polyethylene glycol-polytetrahydrofuran hydroxyl end-capped block diols linked by urethane bonds. B4. Deviation and purification: The reaction product obtained in step B3 is subjected to volatile removal at 80–100℃ and absolute pressure ≤1kPa and then subjected to hot filtration to obtain a polyethylene glycol-polytetrahydrofuran diol block copolymer with a hydroxyl value of 56–112 mgKOH / g and a corresponding number average molecular weight of 1000–2000.

6. The directional moisture-wicking, breathable, and quick-drying fabric as described in claim 2, characterized in that, The coating process for the low surface energy coating includes: C1. Dissolve the methyl methacrylate-butyl acrylate copolymer in toluene or butanone solvent to prepare a coating solution with a solid content of 8-15%; C2. Apply the coating to the hydrophobic surface of the thermoplastic polyurethane film using a doctor blade coating method. The doctor blade tilt angle is 30-45° and the coating speed is 5-15m / min. C3. The coating amount is controlled at 0.6-1.2 g / m², and the coating amount is determined by the dry weight method. Precise control is achieved by adjusting the doctor blade gap and the coating solution concentration. C4. Curing at 150-165℃ for 2-5 minutes forms a uniform low surface energy coating.

7. The directional moisture-wicking, breathable, and quick-drying fabric as described in claim 1, characterized in that, The outer composite knitted fabric is a warp-knitted or weft-knitted fabric woven from polyester or polyamide fibers; the middle layer hydrophilic nonwoven fabric is a spunlace or needle-punched nonwoven fabric made from a mixture of polyvinyl alcohol fibers and polyester fibers in a mass ratio of 2:8 to 5:5; the inner layer hydrophilically treated knitted fabric is a plain knitted or rib knitted fabric woven from polyester or polyamide fibers, treated with polyethylene glycol monomethyl ether or hydroxyethyl cellulose hydrophilic finishing agent, with an areal density of 100-200 g / m².

8. A method for preparing a directional moisture-wicking, breathable, and quick-drying fabric as described in any one of claims 1 to 7, characterized in that, The following steps are involved: S1. Preparation of outer composite: The hydrophilic surface of the thermoplastic polyurethane film is bonded to the knitted fabric, with the thermoplastic polyurethane film located on the outside of the knitted fabric. The bonding is done by dot-shaped or strip-shaped hot pressing, with the bonding area accounting for 20-40% of the total area and the bonding dot spacing being 5-10 mm. The bonding is carried out at a temperature of 120-140℃ and a pressure of 0.2-0.5 MPa for 1-3 min to form the outer composite. S2. Intermediate layer preparation: Select hydrophilic nonwoven fabric with a surface density of 40-80g / m² as the intermediate layer; S3. Inner layer preparation: Select a hydrophilic knitted fabric as the inner layer; S4. Three-layer integral composite: The knitted fabric surface of the outer composite, the hydrophilic nonwoven fabric of the middle layer, and the knitted fabric of the inner layer are stacked in sequence, with the outer composite on the outermost side and the thermoplastic polyurethane film facing outward. The three-layer integral composite fabric is formed by hot pressing with a copolyester hot melt adhesive dotted network at a temperature of 140-150℃ and a pressure of 0.1-0.3MPa for 2-5 minutes.

9. The method for preparing a directional moisture-wicking, breathable, and quick-drying fabric as described in claim 8, characterized in that, In step S4, the diameter of the copolyester hot melt adhesive dots is 0.3-0.8 mm, the area coverage is 15-25%, and the melting temperature of the hot melt adhesive is 130-150℃.

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