Skin-friendly sweat-permeable fabric and preparation method thereof

Abstract

The invention relates to a skin-friendly sweat-permeable fabric and a preparation method thereof, and belongs to the technical field of fabrics. The fabric is composed of closely woven base cloth and a modified polyurethane coating on the surface. The modified polyurethane is formed by copolymerization of diisocyanate, dihydric alcohol, a hydrophilic chain extender and a special modified alcohol monomer, the monomer is prepared by hydrosilylation of a linear end hydrogen-containing polysiloxane oligomer and monoalkenyl alcohol, and the structure of the monomer is that two ends are alcoholic hydroxyl groups, and the middle part is connected with a short siloxane chain through a long-chain alkyl group. After the structure is embedded into a polyurethane main chain as a key unit, microphase separation is induced to be generated, a nanoscale hydrophobic microgap network is formed in the coating, efficient physical moisture permeability is achieved, and water pressure resistance is not affected; a stable and discontinuous low-surface-energy micro-area is formed on the surface of the coating, so that the fabric is dry and smooth in touch.

Description

Technical Field

[0001] This invention belongs to the field of fabric technology, specifically relating to a skin-friendly and breathable fabric and its preparation method. Background Technology

[0002] With the upgrading of consumption, the market's demand for clothing comfort is increasing, especially in the fields of high-end sportswear, intimate apparel, and luxury home textiles, where "skin-friendly feel" has become a core selling point. Ideal skin-friendly fabrics need to meet two major requirements simultaneously: first, instant dryness and a silky touch to eliminate roughness and stickiness when in contact with the skin; second, long-lasting dynamic heat and moisture management capabilities to ensure that the skin remains dry and comfortable even in scenarios with high heat and moisture generation, such as strenuous exercise.

[0003] To impart skin-friendly properties to ordinary fabrics, coating finishing technology is one of the most effective methods currently available. Among them, polyurethane (PU) is widely used as a matrix material for skin-friendly coatings due to its excellent film-forming properties, flexibility, and moderate moisture permeability. Its moisture permeability mechanism mainly relies on two technical pathways: one is to construct a microporous structure, utilizing the principle that the pore size is between that of water vapor and liquid water molecules to achieve physical moisture permeability; the other is to introduce hydrophilic segments, relying on the chemical pathway of "adsorption-diffusion-desorption" to transfer water molecules.

[0004] However, traditional polyurethane coatings have obvious drawbacks: First, their moisture permeability is highly dependent on the difference in ambient humidity. Under extreme conditions of high temperature and high humidity (such as high-intensity exercise), the moisture driving force is insufficient, which leads to the inability of sweat to be discharged in time, resulting in an unpleasant stuffy feeling. Second, the coating itself will significantly increase the stiffness of the fabric, resulting in a stiff feel. Moreover, when sweating, the hydrophilic components are prone to producing an uncomfortable sticky feeling, which seriously damages the comfort against the skin.

[0005] To overcome these challenges, existing technologies have mainly attempted the following three solutions, but all have limitations:

[0006] Hydrophilic modification: Introducing hydrophilic components such as polyethylene glycol through blending or copolymerization can improve the "chemical moisture permeability". However, excessive introduction will seriously sacrifice the water pressure resistance of the coating and may cause the coating to swell when exposed to water, causing the moisture permeability channels to fail.

[0007] Pore ​​creation using fillers: This method constructs "physically permeable" micropores by adding inorganic fillers such as silica. However, it faces technical bottlenecks such as uneven filler dispersion and easy agglomeration, leading to unstable performance improvements. More seriously, the addition of rigid fillers drastically accelerates coating hardening, contradicting the initial goal of achieving a flexible coating.

[0008] Organosilicon modification: Utilizing the low surface energy of organosilicon to impart a smooth feel. However, existing technologies mostly employ physical blending of macromolecular silicone oils, which carries the risk of silicone oil migration, precipitation, and affecting coating uniformity and adhesion. Furthermore, this simple "slippery feel" is fundamentally different from the skin-friendly experience provided by the complex microstructure of human skin—a close fit, dryness, and a pressure-free sensation. Summary of the Invention

[0009] In order to solve the technical problems mentioned in the background art, the purpose of this invention is to provide a skin-friendly and breathable fabric and its preparation method.

[0010] The objective of this invention can be achieved through the following technical solutions:

[0011] A skin-friendly and breathable fabric includes a densely woven base fabric and a top coating, wherein the top coating is formed by curing a modified polyurethane slurry. Specifically, the slurry consists of: 100 parts of modified waterborne polyurethane dispersion, 0.5-0.8 parts of wetting and leveling agent, 0.2-0.3 parts of defoamer, and a certain amount of thickener.

[0012] The preparation method of the modified waterborne polyurethane dispersion is as follows:

[0013] Step A1: Premix the linear end hydrogen-containing polysiloxane oligomer, monoalkenol and toluene, then add Karstedt catalyst to control the Pt content to 10-15 ppm, heat to 70-90℃ under nitrogen protection and stir for 5.5-7 h, after the reaction is completed, reduce the pressure and rotary evaporate to recover the toluene to obtain the modified alcohol monomer.

[0014] Furthermore, the molar ratio of the linear end-hydrogen-containing polysiloxane oligomer to the monoalkenyl alcohol is 1:2.02-2.05;

[0015] Preferably, the linear end hydrogen-containing polysiloxane oligomer is one of octamethyltetrasiloxane and dodecyl dihydrohexasiloxane.

[0016] Preferably, the monoenol is one of undecenol and octadecenol.

[0017] Step A2: Premix polycarbonate diol, modified alcohol monomer and acetone, add isophorone diisocyanate and dibutyltin dilaurate under dry nitrogen protection and mix well, heat to 70-80℃ and stir for 2.2-2.8h to obtain prepolymer solution;

[0018] Furthermore, the -NCO / -OH molar ratio of isophorone diisocyanate to polycarbonate diol and modified alcohol monomer is 1:0.65-0.72, and the amount of dibutyltin dilaurate is 0.025-0.03wt%.

[0019] Furthermore, the amount of modified alcohol monomer used is 15-22 wt% of polycarbonate diol.

[0020] Step A3: Control the temperature of the prepolymer solution in a water bath at 40-50℃, slowly add the acetone solution of dimethylolbutyric acid and stir for 3-4 hours. Then neutralize and add deionized water for shear emulsification. Recover the acetone by rotary evaporation under reduced pressure and adjust the solid content to 32-36wt% to obtain the modified waterborne polyurethane dispersion.

[0021] Furthermore, the -NCO / -OH molar ratio of the prepolymer and dimethylolbutyric acid is 1:1.

[0022] The preparation method of skin-friendly and sweat-wicking fabric is as follows:

[0023] Step S1: Premix the modified waterborne polyurethane dispersion, wetting and leveling agent and defoamer, add thickener to adjust viscosity, and obtain modified polyurethane slurry after vacuum degassing;

[0024] Step S2: Apply the modified polyurethane slurry to the surface of the densely woven base fabric, and then pre-bake, calender, final bake, wash and dry in sequence to obtain a skin-friendly and breathable fabric.

[0025] The beneficial effects of this invention are:

[0026] This invention, through ingenious molecular design, successfully prepared a functional coating with a biomimetic microstructure, fundamentally and synergistically resolving the inherent contradiction between moisture permeability and skin-friendliness in polyurethane coatings. Its core innovation lies in the synthesis and introduction of a modified alcohol monomer with a "long-chain alkyl-short siloxane-long-chain alkyl-diol" symmetrical structure. This monomer, acting as a key chain extender or part of the soft segment, directly participates in the copolymerization reaction of polyurethane. Its unique molecular configuration plays the role of a "multifunctional structural unit" in the polyurethane macromolecular backbone, thereby inducing a series of synergistic and beneficial effects.

[0027] Regarding moisture permeability, when this modified structural unit is embedded in the polyurethane backbone, the short siloxane segments in the middle of the molecule exhibit significant differences in polarity and compatibility with other parts of the polyurethane backbone (such as the soft segments of polycarbonate and the hard segments of urethane). This thermodynamic instability drives strong microphase separation. Simultaneously, the long-chain alkyl groups connecting the siloxane to the two hydroxyl groups at both ends, due to their inherent flexibility and large spatial volume, produce significant "spaced" and "cohesive" effects between the polyurethane segments. The synergistic effect of these two factors does not result in simple macroscopic phase separation, but rather constructs a large number of interconnected, nanoscale hydrophobic micro-networks within the polyurethane bulk. These micro-networks constitute highly efficient physical moisture permeability channels. Water vapor molecules can pass through these hydrophobic channels at extremely high speeds, while liquid water molecule clusters are effectively blocked due to surface tension. Crucially, because the entire channel is composed of hydrophobic siloxanes and alkyl chains, it fundamentally avoids the failure mode of traditional hydrophilic coatings that swell upon contact with water, leading to closure of the moisture permeability channels. This allows it to maintain stable and efficient moisture permeability even in extreme environments with high temperature and humidity. The significantly increased moisture permeability and significantly reduced dynamic moisture permeability resistance shown in the test data directly demonstrate the superior and stable performance of this hydrophobic nanochannel in moisture removal.

[0028] This molecular structure also plays a crucial role in skin-friendliness. During the coating film formation and curing process, short siloxane segments located on the macromolecular backbone spontaneously migrate and accumulate at the interface between the coating and air due to their extremely low surface energy. However, unlike physically blended silicone oils, these siloxane segments are firmly anchored to the polyurethane backbone and cannot migrate or dissipate freely, thus forming a large number of stable, nanoscale, and discontinuous low surface energy micro-regions on the coating surface. This microstructure highly mimics the discontinuous sweat glands and skin grooves on the human skin surface in a biomimetic sense. When the skin comes into contact with the coating, it actually comes into contact with these dispersed "low-friction islands" rather than a continuous polymer "ocean," thereby achieving a significant reduction in the coefficient of friction physically, resulting in a lasting, non-sticky, dry, and silky feel. Meanwhile, the long-chain alkyl groups embedded in the main chain, with their excellent flexibility, act as "internal plasticizers" and "flexible hinges" together with the siloxane segments. They effectively reduce the motion resistance of the entire macromolecular chain, giving the coating extreme flexibility and high elasticity on a macroscopic scale, completely avoiding the hardening problems caused by adding rigid fillers or excessive crosslinking. The low bending stiffness in the KES test and the extremely high softness score in the subjective evaluation jointly confirm the superiority of this main chain flexible design.

[0029] In summary, this invention unifies the construction of breathable channels and the realization of a skin-friendly feel within a single, precisely designed "multifunctional structural unit" through a novel molecular architecture. By introducing specific biomimetic structures into the polyurethane backbone, it induces the formation of a stable hydrophobic nano-breathable network and a low-friction surface microstructure, successfully integrating "breathable" waterproof capabilities with a "skin-like" soft touch. This provides a novel and efficient solution to address the technical bottlenecks of high-end skin-friendly breathable fabrics. Detailed Implementation

[0030] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0031] Example 1, the preparation of skin-friendly and sweat-wicking fabric, mainly involves the following three aspects of the process flow:

[0032] I. Preparation of Modified Waterborne Polyurethane Dispersions

[0033] Step A1: Linear end-hydrogen-containing polysiloxane oligomers and mono-enols were used as reaction raw materials, selected from octamethyltetrasiloxane and undecenol, respectively. The two were fed in a molar ratio of 1:2.02 and 0.8 times the amount of toluene was added for premixing. 5000 ppm of Karstedt catalyst was added to the premix, and the Pt content in the reaction system was controlled to be 10 ppm. Nitrogen gas was introduced for protection, and the temperature was raised to 70°C and stirred for 7 hours. After the reaction was completed, the toluene was recovered by rotary evaporation under reduced pressure to obtain the modified alcohol monomer.

[0034] Step A2: Using isophorone diisocyanate, polycarbonate diol (molecular weight 2000), and modified alcohol monomer as reaction raw materials, polycarbonate diol and 15 wt% of its modified alcohol monomer and 1.2 times the mass of the raw materials in acetone are premixed and protected with dry nitrogen gas. Isophorone diisocyanate is added to control the reaction, and the -NCO / -OH molar ratio of isophorone diisocyanate to polycarbonate diol and modified alcohol monomer is 1:0.65. At the same time, 0.025 wt% of dibutyltin dilaurate is added and mixed. The mixture is heated to 70℃ and stirred for 2.8 h. The -NCO content is monitored by di-n-butylamine titration and is close to the theoretical value to obtain the prepolymer solution.

[0035] Step A3: The prepolymer solution was heated to 40°C in a water bath. An acetone solution of dimethylolbutyric acid was slowly added, and the -NCO / -OH molar ratio of the prepolymer solution and dimethylolbutyric acid was controlled to be 1:1. After stirring for 4 hours, the viscosity of the reaction solution approached stability. AMP-95 was added for neutralization. Then, 4 times the mass of deionized water was added to the reaction solution and sheared at 5000 rpm to form a stable emulsion. The acetone was then recovered by rotary evaporation under reduced pressure and controlled at 40°C, and the solid content was adjusted to 32 wt% to obtain the modified waterborne polyurethane dispersion.

[0036] II. Preparation of Modified Polyurethane Slurry

[0037] The following components are prepared by weight: 100 parts of modified waterborne polyurethane dispersion (prepared in this embodiment); 0.5 parts of wetting and leveling agent (BYK-346); 0.2 parts of defoamer (TEGO Airex 902W); and a certain amount of thickener (RM-2020).

[0038] The modified waterborne polyurethane dispersion, wetting and leveling agent and defoamer were premixed, and a thickener was added to adjust the viscosity to 3500±100mPa·s. After vacuum degassing, the modified polyurethane slurry was obtained.

[0039] III. Fabric Preparation

[0040] Using 40D nylon ultrafine denier densely woven base fabric as the substrate, the modified polyurethane slurry prepared above was applied at a ratio of 21 g / m². 2 The coating is applied to the surface of the densely woven base fabric, then pre-dried at 80℃ for 20 minutes to form a preliminary film. After calendering, it is finally dried at 110℃ for 5 minutes to form the final product. After washing and drying, a surface coating is formed on the surface of the densely woven base fabric, thus obtaining a skin-friendly and sweat-wicking fabric.

[0041] Example 2, the preparation of skin-friendly and sweat-wicking fabric, mainly involves the following three aspects of the process flow:

[0042] I. Preparation of Modified Waterborne Polyurethane Dispersions

[0043] Step A1: Linear end-hydrogen-containing polysiloxane oligomers and mono-enols were used as reaction raw materials, selected from octamethyltetrasiloxane and undecenol, respectively. The two were fed in a molar ratio of 1:2.03 and 0.8 times the amount of toluene was added for premixing. 5000 ppm of Karstedt catalyst was added to the premix, and the Pt content in the reaction system was controlled to be 12 ppm. Nitrogen gas was introduced for protection, and the temperature was raised to 75°C and stirred for 6.7 h. After the reaction was completed, the toluene was recovered by rotary evaporation under reduced pressure to obtain the modified alcohol monomer.

[0044] Step A2: Using isophorone diisocyanate, polycarbonate diol (molecular weight 2000), and modified alcohol monomer as reaction raw materials, polycarbonate diol and 17 wt% of its modified alcohol monomer and 1.2 times the mass of the raw materials in acetone are premixed and protected with dry nitrogen gas. Isophorone diisocyanate is added to control the reaction, and the -NCO / -OH molar ratio of isophorone diisocyanate to polycarbonate diol and modified alcohol monomer is 1:0.67. At the same time, 0.027 wt% of dibutyltin dilaurate is added and mixed. The mixture is heated to 70°C and stirred for 2.6 h. The -NCO content is monitored by di-n-butylamine titration and is close to the theoretical value to obtain the prepolymer solution.

[0045] Step A3: The prepolymer solution was heated to 45°C in a water bath. An acetone solution of dimethylolbutyric acid was slowly added, and the -NCO / -OH molar ratio of the prepolymer solution and dimethylolbutyric acid was controlled to be 1:1. After stirring for 3.7 h, the viscosity of the reaction solution approached stability. AMP-95 was added for neutralization. Then, 4 times the mass of deionized water was added to the reaction solution and sheared at 5000 rpm to form a stable emulsion. The acetone was then recovered by rotary evaporation under reduced pressure and controlled at 40°C, and the solid content was adjusted to 32 wt% to obtain the modified waterborne polyurethane dispersion.

[0046] II. Preparation of Modified Polyurethane Slurry

[0047] The following components are prepared by weight: 100 parts of modified waterborne polyurethane dispersion (prepared in this embodiment); 0.6 parts of wetting and leveling agent (BYK-346); 0.2 parts of defoamer (TEGO Airex 902W); and a certain amount of thickener (RM-2020).

[0048] The modified waterborne polyurethane dispersion, wetting and leveling agent and defoamer were premixed, and a thickener was added to adjust the viscosity to 3500±100mPa·s. After vacuum degassing, the modified polyurethane slurry was obtained.

[0049] III. Fabric Preparation

[0050] Using 40D nylon ultrafine denier densely woven base fabric as the substrate, the modified polyurethane slurry prepared above was applied at a ratio of 21 g / m². 2 The coating is applied to the surface of the densely woven base fabric, then pre-dried at 80℃ for 20 minutes to form a preliminary film. After calendering, it is finally dried at 110℃ for 5 minutes to form the final product. After washing and drying, a surface coating is formed on the surface of the densely woven base fabric, thus obtaining a skin-friendly and sweat-wicking fabric.

[0051] Example 3, the preparation of skin-friendly and sweat-wicking fabric, mainly involves the following three aspects of the process flow:

[0052] I. Preparation of Modified Waterborne Polyurethane Dispersions

[0053] Step A1: Linear end-hydrogen-containing polysiloxane oligomers and mono-enols were used as reaction raw materials, selected from dodecyl dihydrohexasiloxane and octadecenol, respectively. The two were fed in a molar ratio of 1:2.05 and 1.1 times the amount of toluene was added for premixing. 5000 ppm of Karstedt catalyst was added to the premix, and the Pt content in the reaction system was controlled to be 15 ppm. Nitrogen gas was introduced for protection, and the temperature was raised to 90°C and stirred for 5.5 h. After the reaction was completed, the toluene was recovered by rotary evaporation under reduced pressure to obtain the modified alcohol monomer.

[0054] Step A2: Using isophorone diisocyanate, polycarbonate diol (molecular weight 2000), and modified alcohol monomer as reaction raw materials, polycarbonate diol and 22 wt% of its modified alcohol monomer and 1.5 times the mass of the raw materials in acetone are premixed and protected with dry nitrogen gas. Isophorone diisocyanate is added to control the reaction, and the -NCO / -OH molar ratio of isophorone diisocyanate to polycarbonate diol and modified alcohol monomer is 1:0.72. At the same time, 0.03 wt% of dibutyltin dilaurate is added and mixed. The mixture is heated to 80℃ and stirred for 2.2 h. The -NCO content is monitored by di-n-butylamine titration and is close to the theoretical value to obtain the prepolymer solution.

[0055] Step A3: The prepolymer solution was heated to 50°C in a water bath. An acetone solution of dimethylolbutyric acid was slowly added, and the -NCO / -OH molar ratio of the prepolymer solution and dimethylolbutyric acid was controlled to be 1:1. After stirring for 3 hours, the viscosity of the reaction solution approached stability. AMP-95 was added for neutralization. Then, 4 times the mass of deionized water was added to the reaction solution and sheared at 5000 rpm to form a stable emulsion. The acetone was then recovered by rotary evaporation under reduced pressure and controlled at 40°C, and the solid content was adjusted to 36 wt% to obtain the modified waterborne polyurethane dispersion.

[0056] II. Preparation of Modified Polyurethane Slurry

[0057] The following components are prepared by weight: 100 parts of modified waterborne polyurethane dispersion (prepared in this embodiment); 0.8 parts of wetting and leveling agent (BYK-346); 0.3 parts of defoamer (TEGO Airex 902W); and a certain amount of thickener (RM-2020).

[0058] The modified waterborne polyurethane dispersion, wetting and leveling agent and defoamer were premixed, and a thickener was added to adjust the viscosity to 3500±100mPa·s. After vacuum degassing, the modified polyurethane slurry was obtained.

[0059] III. Fabric Preparation

[0060] Using 40D nylon ultrafine denier densely woven base fabric as the substrate, the modified polyurethane slurry prepared above was applied at a ratio of 18 g / m². 2The coating is applied to the surface of the densely woven base fabric, then pre-dried at 80℃ for 20 minutes to form a preliminary film. After calendering, it is finally dried at 110℃ for 5 minutes to form the final product. After washing and drying, a surface coating is formed on the surface of the densely woven base fabric, thus obtaining a skin-friendly and sweat-wicking fabric.

[0061] Example 4, the preparation of skin-friendly and sweat-wicking fabric, mainly involves the following three aspects of the process flow:

[0062] I. Preparation of Modified Waterborne Polyurethane Dispersions

[0063] Step A1: Linear end-hydrogen-containing polysiloxane oligomers and mono-enols were used as reaction raw materials, selected from dodecyl dihydrohexasiloxane and octadecenol, respectively. The two were fed in a molar ratio of 1:2.04 and 1.1 times the amount of toluene was added for premixing. 5000 ppm of Karstedt catalyst was added to the premix, and the Pt content in the reaction system was controlled to be 14 ppm. Nitrogen gas was introduced for protection, and the temperature was raised to 90°C and stirred for 5.8 h. After the reaction was completed, the toluene was recovered by rotary evaporation under reduced pressure to obtain the modified alcohol monomer.

[0064] Step A2: Using isophorone diisocyanate, polycarbonate diol (molecular weight 2000), and modified alcohol monomer as reaction raw materials, polycarbonate diol and 20 wt% of its modified alcohol monomer and 1.4 times the mass of the raw materials in acetone are premixed and protected with dry nitrogen gas. Isophorone diisocyanate is added to control the -NCO / -OH molar ratio of isophorone diisocyanate to polycarbonate diol and modified alcohol monomer at 1:0.7. At the same time, 0.03 wt% of dibutyltin dilaurate is added and mixed. The mixture is heated to 80℃ and stirred for 2.6 h. The -NCO content is monitored by di-n-butylamine titration and is close to the theoretical value to obtain the prepolymer solution.

[0065] Step A3: The prepolymer solution was heated to 50°C in a water bath. An acetone solution of dimethylolbutyric acid was slowly added, and the -NCO / -OH molar ratio of the prepolymer solution and dimethylolbutyric acid was controlled to be 1:1. After stirring for 3.2 hours, the viscosity of the reaction solution approached stability. AMP-95 was added for neutralization. Then, 4 times the mass of deionized water was added and sheared at 5000 rpm to form a stable emulsion. The acetone was then recovered by rotary evaporation under reduced pressure and controlled at 40°C, and the solid content was adjusted to 35 wt% to obtain the modified waterborne polyurethane dispersion.

[0066] II. Preparation of Modified Polyurethane Slurry

[0067] The following components are prepared by weight: 100 parts of modified waterborne polyurethane dispersion (prepared in this embodiment); 0.57 parts of wetting and leveling agent (BYK-346); 0.3 parts of defoamer (TEGO Airex 902W); and a certain amount of thickener (RM-2020).

[0068] The modified waterborne polyurethane dispersion, wetting and leveling agent and defoamer were premixed, and a thickener was added to adjust the viscosity to 3500±100mPa·s. After vacuum degassing, the modified polyurethane slurry was obtained.

[0069] III. Fabric Preparation

[0070] Using 40D nylon ultrafine denier densely woven base fabric as the substrate, the modified polyurethane slurry prepared above was applied at a concentration of 18-21 g / m³. 2 The coating is applied to the surface of the densely woven base fabric, then pre-dried at 80℃ for 20 minutes to form a preliminary film. After calendering, it is finally dried at 110℃ for 5 minutes to form the final product. After washing and drying, a surface coating is formed on the surface of the densely woven base fabric, thus obtaining a skin-friendly and sweat-wicking fabric.

[0071] Comparative Example 1 follows the same process as Example 2, but without adding modified alcohol monomers during the preparation of the prepolymer liquid. Instead, DMS-C21 type methanol (hydroxyl)-terminated polydimethylsiloxane is used to supplement the diol content. The rest of the process is the same.

[0072] Comparative Example 2 uses commercially available high-end skin-friendly polyurethane coating paste for fabrics, specifically Impranil® DL1016, and prepares the fabric by coating with the same dry film thickness as in Example 2.

[0073] The fabric prepared as described above was tested for moisture permeability according to GB / T 12704-2009 standard; moisture resistance (Ret) was tested according to ISO 11092-2021 standard; and hydrostatic pressure resistance was tested according to AATCC 127-2018 standard. Specific test results are shown in Table 1.

[0074] <![CDATA[Water vapor permeability (g / m 2 ·24 h)]]> <![CDATA[Wet resistance Ret (m 2 ·Pa / W)]]> <![CDATA[Hydrostatic pressure resistance (mmH2O)]]> Example 1 7590 5.0 6400 Example 2 7730 4.7 6100 Example 3 8120 4.1 5500 Example 4 8250 3.9 5300 Comparative Example 1 5950 6.4 4700 Comparative Example 2 5220 7.1 6800

[0075] Referring to the KES fabric hand feel and style testing system, the bending stiffness of the fabric was tested using the KES-FB2-A bending tester, and the coefficient of friction of the fabric was tested using the KES-FB4-A surface performance tester; the specific test results are shown in Table 2.

[0076] <![CDATA[Flexural rigidity (gf·cm 2 / cm)]]> Coefficient of friction (MIU) Example 1 0.076 0.109 Example 2 0.082 0.102 Example 3 0.105 0.117 Example 4 0.112 0.125 Comparative Example 1 0.087 0.094 Comparative Example 2 0.152 0.144

[0077] Twenty industry technicians conducted a blind evaluation of the above fabrics, evaluating factors including smoothness, softness, skin feel, and dampness / stickiness. A 5-point scale was used, with 1 being the worst and 5 being the best. The highest and lowest scores were removed, and the average score was calculated. The specific test results are shown in Table 3.

[0078] Smoothness Softness Skin-friendly damp and sticky feeling Example 1 4.5 4.7 4.5 4.1 Example 2 4.8 4.4 4.7 4.4 Example 3 4.5 4.3 4.2 4.6 Example 4 4.1 4.1 4.0 4.8 Comparative Example 1 4.2 4.5 3.9 2.2 Comparative Example 2 3.6 3.3 2.5 2.8

[0079] Based on the above test results, in the sweat-wicking and waterproof test, the fabric in this example achieved a moisture permeability of 7000 g / m².2 • After 24 hours, the moisture resistance was significantly lower than that of the comparative example, demonstrating excellent moisture permeability. It did not feel stuffy even under strenuous exercise. The hydrostatic pressure also reached over 5000 mmH2O, indicating good waterproof performance. While maintaining high perspiration permeability, there was almost no significant loss in waterproof performance. In the subjective and objective evaluation of skin-friendliness, the bending stiffness and coefficient of friction of the fabric in the example were both within a relatively low range, and it received a high score in the blind evaluation, providing a special and tangible skin-friendly experience.

[0080] In the description of this specification, the references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0081] The above description is merely an example and illustration of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described, or use similar methods to replace them, as long as they do not deviate from the invention or exceed the scope defined in the claims, all of which should fall within the protection scope of the present invention.

Claims

1. A skin-friendly and breathable fabric, comprising a densely woven base fabric and a surface coating, characterized in that, The topcoat is cured from a modified polyurethane slurry. Specifically, the slurry consists of: 100 parts of modified waterborne polyurethane dispersion, 0.5-0.8 parts of wetting and leveling agent, 0.2-0.3 parts of defoamer, and a certain amount of thickener. The preparation method of the modified waterborne polyurethane dispersion is as follows: Step A1: Premix the linear end hydrogen-containing polysiloxane oligomer, monoalkenol and toluene, then add Karstedt catalyst to control the Pt content to 10-15 ppm, and heat to 70-90℃ under nitrogen protection and stir for 5.5-7 h to prepare the modified alcohol monomer. Step A2: Premix polycarbonate diol, modified alcohol monomer and acetone, add isophorone diisocyanate and dibutyltin dilaurate under dry nitrogen protection and mix well, heat to 70-80℃ and stir to react for 2.2-2.8h to prepare prepolymer solution; Step A3: Control the temperature of the prepolymer solution in a water bath at 40-50℃, slowly add the acetone solution of dimethylolbutyric acid and stir for 3-4 hours. Then neutralize and add deionized water for shear emulsification. Recover the acetone by rotary evaporation under reduced pressure and adjust the solid content to 32-36wt% to prepare a modified waterborne polyurethane dispersion.

2. The skin-friendly and breathable fabric according to claim 1, characterized in that, The molar ratio of linear end-hydrogen-containing polysiloxane oligomers to monoalkenyl alcohols is 1:2.02-2.

05.

3. The skin-friendly and breathable fabric according to claim 2, characterized in that, The linear end hydrogen-containing polysiloxane oligomer is one of octamethyltetrasiloxane and dodecyl dihydrohexasiloxane.

4. The skin-friendly and breathable fabric according to claim 3, characterized in that, Monoenols are one of undecenol and octadecenol.

5. The skin-friendly and breathable fabric according to claim 4, characterized in that, The -NCO / -OH molar ratio of isophorone diisocyanate to polycarbonate diol and modified alcohol monomer is 1:0.65-0.72, and the amount of dibutyltin dilaurate is 0.025-0.03wt%.

6. The skin-friendly and breathable fabric according to claim 5, characterized in that, The amount of modified alcohol monomer used is 15-22 wt% of polycarbonate diol.

7. The skin-friendly and breathable fabric according to claim 6, characterized in that, The molar ratio of -NCO / -OH in the prepolymer solution and dimethylolbutyric acid is 1:

1.

8. A method for preparing a skin-friendly and breathable fabric according to any one of claims 1-7, characterized in that, Specifically: Step S1: Premix the modified waterborne polyurethane dispersion, wetting and leveling agent and defoamer, add thickener to adjust viscosity, and obtain modified polyurethane slurry after vacuum degassing; Step S2: Apply the modified polyurethane slurry to the surface of the densely woven base fabric, and then pre-bake, calender, final bake, wash and dry in sequence to obtain a skin-friendly and breathable fabric.