Easy-care waterproof cotton and linen composite fabric and preparation method thereof

Abstract

The invention discloses an easy-care waterproof cotton and linen composite fabric and a preparation method thereof.The easy-care waterproof cotton and linen composite fabric comprises an outer layer, a middle layer and an inner layer which are sequentially arranged from outside to inside, the outer layer is a high-density woven fabric, and blended yarns of the outer layer comprise, by mass, 40-60% of linen fibers and cotton fibers, 20-40% of superfine polyester fibers, 20-40% of superfine polyester fibers, 20-40% of superfine polyester fibers, 20-40% of superfine polyester fibers and 20-40% of superfine polyester fibers. The polytetrafluoroethylene microfiber accounts for 10-30 wt%; the middle layer is elastic moisture-conducting screen cloth, and the elastic moisture-conducting screen cloth is of a net-shaped structure made of spandex core-spun yarn; the inner layer is a cotton woven fabric subjected to crease-resistant finishing; the outer layer is responsible for core protection, the middle layer plays a role in moisture conduction and connection, the inner layer ensures skin-friendly and comfortable effects, the dotted composite mode ensures the firm structure, original pores of all layers of materials are reserved to the maximum extent, the whole fabric keeps excellent air permeability, and stiffness, hardening and stuffiness caused by a coating process and a thin film composite process are avoided.

Description

Technical Field

[0001] This application relates to clothing fabrics, and more particularly to an easy-care waterproof cotton-linen composite fabric and its preparation method. Background Technology

[0002] Cotton and linen fabrics, as an important category of natural textile fabrics, have long been favored by consumers and widely used in clothing, home decoration and other fields due to their advantages such as being made from natural plants (cotton, flax), having a soft and comfortable feel, excellent breathability, good moisture absorption and perspiration wicking properties, and having unique natural textures.

[0003] However, cotton and linen fabrics themselves have significant performance defects: Firstly, the waterproof performance is poor. The porous structure of natural fibers makes the fabric easy to absorb water. When it comes into contact with water, it will not only penetrate quickly, but also increase in weight due to water absorption, affecting the user experience. Especially in outdoor scenarios (such as outdoor leisure and short trips), once it encounters rain or dew, clothing and household items are easily soaked, making it difficult to meet users' needs for waterproof function. Secondly, it is difficult to care for. Cotton and linen fabrics are prone to wrinkles and deformation after washing, and after repeated washing, the fibers are prone to wear and tear and the texture is reduced. Frequent ironing and other care operations are required, which does not meet the modern consumer's demand for "easy-care" fabrics. Summary of the Invention

[0004] To address the issues of non-waterproof and difficult-to-care-for cotton-linen composite fabrics by leveraging the soft and skin-friendly advantages of cotton-linen fabrics, an easy-care waterproof cotton-linen composite fabric and its preparation method are provided.

[0005] The first inventive objective of this invention is achieved through the following technical solution: An easy-care waterproof cotton-linen composite fabric includes an outer layer, a middle layer, and an inner layer arranged sequentially from the outside to the inside. The outer layer, middle layer, and inner layer are composited in a dot-matrix manner. The outer layer is a high-density woven fabric. In the blended yarn of the outer layer, by weight percentage, linen and cotton fibers account for 40-60 wt%, ultrafine polyester fibers account for 20-40 wt%, and polytetrafluoroethylene microfibers account for 10-30 wt%. The middle layer is an elastic moisture-wicking mesh fabric, which is a mesh structure made of spandex core-spun yarn; The inner layer is a cotton woven fabric that has undergone anti-wrinkle treatment.

[0006] By adopting the above technical solution, the outer layer of this application adopts a woven high-density structure, which physically reduces the porosity between yarns and increases the hydrostatic pressure required for water penetration; the ultrafine polyester provides the skeleton of the outer layer, increasing the yarn strength and wrinkle resistance, and its high shrinkage characteristics help to further tighten the fabric structure and reduce porosity during finishing; the polytetrafluoroethylene microfiber has low surface energy, and after being interwoven with other fibers, it is evenly distributed in the outer layer, forming a lasting "micro-fleece" effect on the outer layer surface, which greatly enhances water repellency, making it difficult for water droplets to penetrate; thus, the core waterproof function is achieved by this outer layer; The middle layer is an elastic moisture-wicking mesh fabric, which provides slight elasticity, increases the fabric's wearing comfort and shape recovery, and reduces wrinkles. It also utilizes the hydrophobicity of the spandex core and the hydrophilicity of the covering cotton to create a capillary effect, quickly absorbing sweat from the inner layer and guiding it to the outer layer for dissipation, keeping the wearer dry. This serves to wick away moisture and maintain a connection, and it does not absorb water itself, so it does not add weight. The inner layer uses cotton woven fabric, retaining the maximum softness, comfort, and natural texture of the fabric that comes into contact with the skin. At the same time, due to its wrinkle-resistant finish, it greatly reduces the difficulty of care. Therefore, the easy-care waterproof cotton-linen composite fabric of this application has an outer layer responsible for core protection, a middle layer that plays a role in moisture wicking and connection, and an inner layer that ensures skin-friendly comfort. The dot-matrix composite method ensures structural strength while preserving the original pores of each layer of material to the greatest extent, so that the fabric as a whole maintains excellent breathability and avoids the stiffness, hardening and stuffiness caused by coating process and film composite process.

[0007] Optionally, the outer fabric is treated with a waterproof finishing liquid through padding and baking, wherein the composition of the waterproof finishing liquid is as follows by mass percentage: Epoxy-modified nano-silica dispersion 5-10 wt%, Octadecyltriethoxysilane 1.5–3.5 wt%, 8-15 wt% aqueous polyurethane dispersion Catalyst 0.5–1.5 wt%, The remainder is deionized water.

[0008] By adopting the above technical solution, cotton and linen fabrics are immersed in a waterproof finishing liquid. The finishing liquid is made to penetrate into the fiber gaps and surface by the pressure of the rollers. Components such as nano-silica particles, silane molecules, and polyurethane are initially and uniformly attached to the fiber surface through van der Waals forces and other forces. During the baking process, octadecyltriethoxysilane hydrolyzes to form activated silanol groups, which react with hydroxyl groups on the surface of nano-silica and cellulose fibers, thus permanently chemically grafting hydrophobic long-chain alkyl groups onto the fibers and nanoparticles. Then, the waterborne polyurethane is dehydrated at high temperature to form a film, creating a soft and breathable three-dimensional mesh film that wraps and firmly fixes the nano-silica particles that have been grafted with hydrophobic molecules to the fiber surface, further enhancing the stability of the finishing effect. The polyurethane itself also contributes hydrophobicity and elasticity. Through the above process, a micro-nano composite rough structure is finally formed on the fiber surface. Nano-silica particles and their aggregates constitute microscopic protrusions and roughness. Chemically grafted long-chain alkyl groups are uniformly covered on each protrusion surface, providing extremely low surface energy and significantly improving the water contact angle of the fiber surface. This endows the outer fabric with a long-lasting and environmentally friendly superhydrophobic function. The extremely small amount used and the nano-sized particles ensure that the finished fabric remains soft to the touch, without any stickiness or stiffness, and its breathability is not affected. This completely overcomes the shortcomings of traditional waterproofing agents, where the feel (the effect is not long-lasting and sticky after treatment with nano wax crystal emulsion) and effectiveness cannot be achieved at the same time.

[0009] Optionally, after the outer fabric is impregnated with the waterproof finishing liquid, it is first pre-dried at 80-100℃ for 3-5 minutes, and then baked at 120-140℃ for 2-3 minutes.

[0010] By adopting the above technical solution and directly baking, the excessively high temperature will cause more moisture on the fabric surface to move rapidly from unsaturated areas to saturated areas and from high-temperature areas to low-temperature areas. When the moisture moves, it will carry its dissolved or suspended finishing agent components, such as nano-silica particles, silane, polyurethane, etc., and migrate together, which will eventually lead to uneven distribution of finishing agents on the fiber surface, such as excessive accumulation at yarn intersections and fabric folds, while too little accumulation in flat areas. Areas where the finishing agent is concentrated will feel stiff, have color differences, and appear frosty white, indicating that the waterproofing may be too strong but not breathable; areas with too little finishing agent will have poor waterproofing and become weak points for water seepage. In this application, the pre-drying process is not simply drying out moisture, but a "controllable and rapid fixation process." It uses gentle heat input to evaporate moisture and, before entering the high-temperature baking stage, pre-fixes waterproof finishing liquid components such as nano-silica, silane, and polyurethane onto the fiber surface in a situ and uniform manner to the maximum extent possible. This completely eliminates the "migratory" phenomenon caused by violent moisture evaporation, ensuring that the final hydrophobic layer is uniform and consistent, and avoiding problems such as uneven waterproofing, stiff and rough fabric feel, and color difference.

[0011] Optionally, the anti-wrinkle finishing of the inner layer includes padding in an anti-wrinkle finishing solution and baking; the anti-wrinkle finishing solution comprises, by mass percentage: 4.0 to 6.0 wt% of 1,2,3,4-butanetetracarboxylic acid; Polymaleic acid 1.0–2.0 wt%; Epoxy-modified amino silicone oil microemulsion 2.0–4.0 wt%; Sodium hypophosphite 2.0–3.0 wt%; Penetrant 0.1–0.3 wt%; The remainder is deionized water.

[0012] By adopting the above technical solution, the inner layer is impregnated in an anti-wrinkle finishing solution, which fully penetrates the amorphous region of each fiber. Then, under the baking environment, sodium hypophosphite is activated. Under the action of sodium hypophosphite, the carboxyl groups in 1,2,3,4-butanetetracarboxylic acid and polymaleic acid first dehydrate to form highly reactive anhydrides. These anhydride intermediates rapidly undergo esterification with the hydroxyl groups on the adjacent cellulose macromolecular chains to form strong covalent ester bonds. 1,2,3,4-Butanetetracarboxylic acid has four carboxyl groups. As a "cross-linking bridge", it uses its multiple carboxyl groups as anchor points to pull the originally loose and easily slippery cellulose macromolecular chains closer together and firmly connect them to form a three-dimensional cross-linking network, which restricts the movement of cellulose and thus gives the fabric excellent wrinkle recovery ability. Polymaleic acid, as a synergistic crosslinking agent, has a moderate molecular weight and can effectively penetrate into the amorphous region of the fiber. It works synergistically with 1,2,3,4-butanetetracarboxylic acid to enhance the anti-wrinkle effect. Furthermore, the ester bonds on the polymaleic acid molecular chain itself have flexibility and can act as an "internal plasticizer" to partially offset the increase in fiber rigidity caused by crosslinking and contribute softness from the inside. Meanwhile, the epoxy groups in the epoxy-modified amino silicone oil undergo ring-opening reactions. The silanol active sites after ring opening can undergo etherification or esterification reactions with the hydroxyl groups of cellulose fibers and the carboxyl groups in the formed ester crosslinking network to form CO-Si or C(=O)-O-Si covalent bonds. The organosilicon chains are permanently grafted onto the fibers and crosslinking network through strong covalent bonds. These flexible siloxane long chains play a role in lubrication and isolation between fibers, greatly reducing the friction between fibers, thereby achieving a lasting and extremely soft and smooth feel. This ultimately forms a molecular-level composite network that combines rigidity and flexibility within and on the surface of the fiber. “Gang”: Derived from the covalent cross-linked network formed by 1,2,3,4-butanetetracarboxylic acid / polymaleic acid and cellulose, it provides a framework for wrinkle resistance and shape retention; "Softness": This comes from the flexible long chains of organosilicon grafted onto the backbone through covalent bonds, which provide permanent lubrication and isolation between fibers. The outermost flexible organosilicon chain is in direct contact with the skin. It has extremely low surface energy and a smooth feel, thus giving the inner layer an excellent skin-friendly experience. Thus, the anti-wrinkle finishing of this application simultaneously achieves anti-wrinkle and softness, giving the inner layer lasting anti-wrinkle properties and an excellent soft touch.

[0013] Optionally, the anti-wrinkle finishing process of the inner layer involves: after padding in an anti-wrinkle finishing solution, pre-drying at 80-90℃ for 3-5 minutes, and then baking at 150-160℃ for 90-150 seconds.

[0014] By adopting the above technical solution, the migration and initial concentration of the anti-wrinkle finishing liquid after padding are avoided, ensuring that the cross-linking reaction and silicone oil grafting reaction are fully completed. At the same time, fiber strength damage, yellowing and hardening of the hand feel caused by excessive temperature or time are avoided.

[0015] Optionally, the fineness of the ultrafine polyester is between 0.5D and 1.5D.

[0016] By adopting the above technical solution, high-shrinkage polyester can generate further shrinkage during the finishing and baking process, actively and permanently tightening the fabric structure, physically reducing the porosity between yarns, thereby significantly improving the fabric's ability to resist water pressure penetration, and together with the waterproof finishing agent, it forms a solid waterproof defense.

[0017] Optionally, the dot-like bonding method is environmentally friendly water-based polyurethane dot adhesive bonding; the density of the dot-like bonding dots is 5-25 dots / cm². 2 .

[0018] By adopting the above technical solution, a firm bond is achieved only at discrete points, while the vast majority of the area remains suspended, thus ensuring that the overall breathability and softness of the composite fabric are almost unaffected. This avoids the problem of stiff and non-breathable fabrics caused by full-area adhesive coating in traditional composite processes.

[0019] The second objective of this invention is achieved through the following technical solution: The above-mentioned method for caring for easy-care waterproof cotton-linen composite fabric includes the following steps: S1 Raw material preparation: Prepare the outer layer blended yarn and weave it into a high-density outer layer fabric; prepare the middle layer elastic moisture-wicking mesh fabric; prepare the inner layer fabric and perform anti-wrinkle finishing. S2 outer layer finishing: The outer layer fabric is treated with a durable waterproof finish, including padding with a waterproof finishing agent, drying and high-temperature baking; S3 layered composite: The outer, middle and inner layers, after being prepared, are stacked in sequence. S4 dot-matrix lamination: Using ultrasonic lamination equipment or dispensing lamination equipment, the three-layered materials are bonded together in a dot-matrix manner to form a composite fabric. S5 Curing and Shaping: The composite fabric is cured in a constant temperature environment, and then shaped and inspected.

[0020] By adopting the above technical solution, this method can stably and efficiently prepare composite fabrics that combine excellent waterproofness, breathability, softness and skin-friendliness, and durability and easy care, thus achieving reproducibility of product performance and large-scale production.

[0021] In summary, this application has at least the following beneficial effects: The easy-care waterproof cotton-linen composite fabric of this application has an outer layer responsible for core protection, a middle layer that serves to wick away moisture and connect the layers, and an inner layer that ensures skin-friendly comfort. The dot-matrix composite method ensures structural strength while maximizing the preservation of the original pores of each layer of material, so that the fabric as a whole maintains excellent breathability and avoids the stiffness, hardening, and stuffiness caused by coating and film composite processes. Detailed Implementation

[0022] raw material The polyether polyol, with a number average molecular weight Mn = 2000 ± 100, is Clariant ViscoPlus 3000.

[0023] Allyl glycidyl ether is a commercially available product with a purity of ≥98% and an epoxy value of 7.2 eq / kg.

[0024] Allyl polyether, with a number-average molecular weight Mn = 400 ± 20, is a product of BASF. A400E.

[0025] Polymaleic acid liquid, solid content ≥48%, polymaleic acid number average molecular weight Mn=350±150Da, BASF PM15.

[0026] Fatty alcohol polyoxyethylene ether AEO-7, is a product of Sasol. A7.

[0027] Hydrogen-containing silicone oil for Evonik HYDROSIL2770.

[0028] Paraffin microcrystalline wax, melting point 60±1℃, Honeywell A- 617.

[0029] Polyethylene wax, molecular weight Mn = 3000±200, is a Clariant product. PE520.

[0030] 2D resin, 45% solids content, free formaldehyde <0.1%, is from Anggao. RCT.

[0031] Dimeric acyl diisocyanate, specifically the commercially available DD1410 product, with a purity ≥98%.

[0032] Dimethylolpropionic acid is a commercially available product with a purity of ≥99%.

[0033] Octadecyltriethoxysilane is a commercially available product with a purity of ≥99.5%.

[0034] Chloroplatinic acid is a commercially available product of Sigma-Aldrich.

[0035] 1,2,3,4-Butanetetracarboxylic acid is a commercially available product with a purity of ≥99%.

[0036] OP-10 is a commercially available product with an HLB value of 13.5.

[0037] Oleamide is a commercially available product with an iodine value of 88 gI2 / 100g and a purity of ≥90%.

[0038] p-Toluenesulfonic acid is a commercially available product with a purity of ≥98.0%.

[0039] Triethylamine is a commercially available product with a purity of ≥99.0%.

[0040] Isopropanol is a commercially available product with a purity of ≥98.5%.

[0041] Sodium hypophosphite is a commercially available product with a purity of ≥99.0%.

[0042] Decyl glucoside is a commercially available product with a purity of ≥98.0%.

[0043] Citric acid, a commercially available product, with a purity of ≥99.5%.

[0044] Magnesium chloride, a commercially available product, has a hexahydrate purity of ≥99.0%.

[0045] Nano silica powder, a commercially available product, with a particle size of 30nm; KH560, a commercially available product.

[0046] Ethanol is a commercially available product with a purity of ≥99.7%.

[0047] Glacial acetic acid, a commercially available product, with a purity of ≥99.5%.

[0048] Hemp fiber, linear density 2.85 dtex, length 80 mm; Cotton fiber, linear density 1.8 dtex, micronaire value 4.2, length 28 mm. Ultrafine polyester fiber, boiling water shrinkage rate 18%, breaking strength 5.0 cN / dtex; length 40 mm; Polytetrafluoroethylene microfibers, fineness 1.0 Dtex, length 28 mm Spandex core-spun yarn, spandex content 20wt%, spandex 44dtex, outer cotton yarn 16 count, twist 800T / m Pure cotton woven fabric, weight 120g / m² 240 count, warp and weft density 120 x 80 threads / inch Environmentally friendly water-based polyurethane dispensing adhesive, solid content 35%, viscosity 5000 cP (25℃), curing temperature 110℃.

[0049] Preparation Example 1 The preparation process of the epoxy-modified nano-silica dispersion is as follows: A suspension was prepared by mixing 30nm nano-silica powder with deionized silica at a mass ratio of 15:85 and dispersing it with ultrasonic assistance. KH560, ethanol, and deionized water were mixed in a mass ratio of 1.5:2:6.5, the pH was adjusted to 4.5 with glacial acetic acid, and the mixture was stirred and hydrolyzed for 30 minutes to obtain the hydrolysate. The hydrolysate was added dropwise to the suspension at a mass ratio of nano-silica powder to KH560 = 1:0.9. The reaction temperature was controlled at 55℃ and the reaction was carried out for 5 hours. After the reaction was completed, the mixture was cooled to room temperature to obtain a dispersion. The dispersion was centrifuged and washed to remove byproducts and unreacted silanes. Finally, it was redispersed with deionized water to a solid content of 20wt% to obtain an epoxy-modified nano-silica dispersion.

[0050] Preparation Example 2 The aqueous polyurethane dispersion is prepared by the following method: 10 kg of polyether polyol and 3.97 kg of dimerized diisocyanate were added to the reactor and reacted at 80 °C for 2.5 h to obtain the terminal-NCO prepolymer.

[0051] Cool the system to 65°C. Add 0.7 kg of dimethylolpropionic acid and react for 1.5 h. Then add 0.53 kg of triethylamine and neutralize for 30 min. Under high-speed shear stirring, 40 kg of deionized water was added to the system in the reactor for emulsification; Finally, small molecules were removed by vacuum distillation to obtain an aqueous polyurethane dispersion.

[0052] The solid content of the obtained aqueous polyurethane dispersion was determined to be 28.5 wt%.

[0053] Preparation Example 3 A waterproof finishing liquid, the raw materials of which are as follows by weight percentage: The composition consists of 8 wt% epoxy-modified nano-silica dispersion, 3 wt% octadecyltriethoxysilane, 12 wt% aqueous polyurethane dispersion, 1.1 wt% catalyst, and the balance being deionized water.

[0054] The epoxy-modified nano-silica dispersion was prepared in Preparation Example 1.

[0055] The aqueous polyurethane dispersion was prepared in Preparation Example 1.

[0056] The catalyst is p-toluenesulfonic acid.

[0057] The specific preparation method is as follows: Weigh out 8 kg of epoxy-modified nano silica dispersion, 3 kg of octadecyltriethoxysilane (3 wt%), 12 kg of aqueous polyurethane dispersion, 1.1 kg of catalyst, and 75.9 kg of deionized water.

[0058] Add 8 kg of epoxy-modified nano silica dispersion to 20 kg of deionized water and dilute with stirring at 200 rpm; add 3 kg of octadecyltriethoxysilane dropwise with stirring, and complete the addition in 20 min; then increase the speed to 600 rpm and stir for 40 min; while maintaining stirring at 600 rpm, add 12 kg of aqueous polyurethane dispersion and continue stirring for 30 min. Keep the mixing tank running, add 1.1 kg of catalyst and the remaining deionized water, and stir for 15 min; After standing and maturing for 12 hours, the solution was filtered through a 100-mesh filter to obtain the waterproof finishing liquid.

[0059] Preparation Example 4 A waterproof finishing liquid, which differs from Preparation Example 3 in that the raw materials are as follows by mass percentage: The composition consists of 5 wt% epoxy-modified nano-silica dispersion, 1.52 wt% octadecyltriethoxysilane, 8 wt% aqueous polyurethane dispersion, 0.5 wt% catalyst, and the balance being deionized water.

[0060] Preparation Example 5 A waterproof finishing liquid, which differs from Preparation Example 3 in that the raw materials are as follows by mass percentage: The composition consists of 10 wt% epoxy-modified nano-silica dispersion, 3.5 wt% octadecyltriethoxysilane, 15 wt% aqueous polyurethane dispersion, 1.5 wt% catalyst, and the remainder is deionized water.

[0061] Preparation Example 6 The preparation process of epoxy-modified amino silicone oil microemulsion is as follows: Add 10 kg of hydrogen-containing silicone oil, 1.37 kg of allyl glycidyl ether and 1.6 kg of allyl polyether to a dry reaction vessel, stir evenly, and then heat to 80°C. 90.8 g of 0.5 wt% isopropanol solution of chloroplatinic acid was added dropwise, and the reaction was kept at the temperature for 5 h to obtain epoxy-modified silicone oil product; The epoxy-modified silicone oil product was cooled to 45°C, and 2.594 kg of nonylphenol polyoxyethylene ether-10 emulsifier was added. The mixture was stirred to ensure that it was fully dissolved in the silicone oil. Under high-speed shearing at 1000 rpm, 36.3 kg of deionized water at 45°C was slowly added to carry out phase inversion emulsification. The system was continuously sheared at 1000 rpm for 30 minutes, and the system changed from water-in-oil to oil-in-water to obtain a crude emulsion. The crude emulsion was homogenized three times under 50 MPa pressure using a high-pressure homogenizer. The pH of the emulsion was adjusted to a weakly acidic range of 5.5 with glacial acetic acid, and then filtered through a 200-mesh sieve to obtain an epoxy-modified amino silicone oil microemulsion.

[0062] Preparation Example 7 An anti-wrinkle finishing liquid, the raw materials of which are, by mass percentage: 5 wt% 1,2,3,4-butanetetracarboxylic acid, 1.5 wt% polymaleic acid (calculated by mass of polymaleic acid), 3 wt% epoxy-modified amino silicone oil microemulsion, 2.5 wt% sodium hypophosphite, 0.2 wt% penetrant, and the balance being deionized water.

[0063] The epoxy-modified amino silicone oil microemulsion was prepared in Preparation Example 6.

[0064] The penetrant is decyl glucoside.

[0065] The specific preparation method is as follows: In a stirred reactor, first add 61.46 kg of deionized water and stir at 400 rpm. Then add 5.0 kg of weighed 1,2,3,4-butanetetracarboxylic acid until the 1,2,3,4-butanetetracarboxylic acid is completely dissolved. Add 1.5 kg of polymaleic acid liquid while stirring continuously, and stir for 30 minutes. Reduce the stirring speed to 200 rpm and slowly add 3.0 kg of epoxy-modified amino silicone oil microemulsion over a period of 20 min. After the addition is complete, increase the speed to 400 rpm and continue stirring until the system is homogeneous, free of floating oil and stratification. While maintaining a stirring speed of 400 rpm, add 2.5 kg of sodium hypophosphite and stir for 15 min to ensure that the sodium hypophosphite is completely dissolved and dispersed. Then add 0.2 kg of penetrant and stir for another 15 min. Add the remaining deionized water to bring the liquid to 100% of the total mass, and stir for 20 minutes to mix thoroughly; Let it stand at room temperature for 12 hours. Stir it again before use and filter it through a 100-mesh filter to obtain the anti-wrinkle finishing solution.

[0066] Preparation Example 8 An anti-wrinkle finishing liquid, which differs from Preparation Example 7 in that the raw materials, by mass percentage, are 4 wt% 1,2,3,4-butanetetracarboxylic acid, 1 wt% polymaleic acid, 2 wt% epoxy-modified amino silicone oil microemulsion, 2 wt% sodium hypophosphite, 0.1 wt% penetrant, and the balance being deionized water.

[0067] Preparation Example 9 An anti-wrinkle finishing liquid, which differs from Preparation Example 4 in that the raw materials, by mass percentage, are 6 wt% 1,2,3,4-butanetetracarboxylic acid, 2 wt% polymaleic acid, 4 wt% epoxy-modified amino silicone oil microemulsion, 3 wt% sodium hypophosphite, 0.3 wt% penetrant, and the balance being deionized water.

[0068] Preparation Example 10 A waterproof finishing liquid, which is a nano-wax crystal emulsion.

[0069] The preparation process is as follows: Add 12.5 kg of paraffin microcrystalline wax and 6.5 kg of polyethylene wax to the reactor, heat to 87.5℃, and stir at 300 rpm for 15 minutes until the wax is completely melted and a homogeneous oil phase is formed. Add 75.75 kg of deionized water, 2.25 kg of OP-10 emulsifier, and 3.0 kg of oleamide to another container, heat to 87.5°C, and stir at 400 rpm for 20 minutes until the emulsifier and softener are completely dissolved to form a transparent aqueous phase. The aqueous phase was transferred to a high-speed shear disperser and the rotation speed was set to 9000 rpm. Under the shearing at 9000 rpm, the oil phase was slowly added dropwise to the aqueous phase at a drop rate of 0.7 kg / min. After the dropwise addition was completed, the high-speed shearing at 9000 rpm was maintained for 30 min until the emulsion particle size distribution was uniform and D50 ≤ 200 nm. Stop heating and shearing, and allow the emulsion to cool naturally to 25°C. Stir at a low speed of 200 rpm during the cooling process to prevent separation. After cooling, the pH value of the emulsion is tested. If necessary, it is adjusted with citric acid to make the pH = 6.5. The emulsion is then filtered through a 200-mesh sieve to obtain a waterproof finishing solution.

[0070] Preparation Example 11 An anti-wrinkle finishing liquid, belonging to the traditional "anti-wrinkle-hardening" type finishing agent, is prepared as follows: Add 50 kg of deionized water to the reactor, heat to 50°C, add 15.6 kg of 2D resin, and stir at 400 rpm for 20 minutes until completely dissolved. Dissolve 2.8 kg of magnesium chloride in deionized water to prepare a 30 wt% magnesium chloride solution; A 30 wt% magnesium chloride solution was slowly added dropwise to the resin solution at a rate of 0.5 kg / min. After the addition was complete, the mixture was stirred at 50°C and 400 rpm for 30 min to obtain the resin-catalyst system. Mix 0.35 kg of fatty alcohol polyoxyethylene ether AEO-7 and 10 kg of deionized water, and stir at 40°C and 600 rpm for 15 min to obtain the additive solution. Add the additive solution to the resin-catalyst system, keep it at 50℃ and 400rpm and stir for 20min, then add the remaining 30.15kg of deionized water and continue stirring for 15min to obtain the initial product; The initial product was cooled to 25°C and allowed to stand for 12 hours to mature. It was then filtered through a 200-mesh filter to obtain the anti-wrinkle finishing liquid.

[0071] Example 1 An easy-care waterproof cotton-linen composite fabric includes an outer layer, a middle layer, and an inner layer arranged sequentially from the outside to the inside, and the outer layer, middle layer, and inner layer are composited in a dot-matrix manner.

[0072] The outer layer is a high-density woven fabric. The blended yarn of the outer layer contains, by weight percentage, 15 wt% hemp fiber, 35 wt% cotton fiber, 25 wt% microfiber of superfine polyester fiber, and 25 wt% polytetrafluoroethylene microfiber.

[0073] The outer layer is further treated by padding, pre-drying, and baking with a waterproof finishing liquid prepared in Example 3.

[0074] The middle layer is an elastic moisture-wicking mesh fabric, which is a mesh structure made of spandex core-spun yarn.

[0075] The inner layer is a cotton woven fabric, which is prepared by padding, pre-drying and baking with an anti-wrinkle finishing liquid prepared in Preparation Example 7.

[0076] The preparation method of easy-care waterproof cotton-linen composite fabric is as follows: Outer layer preparation: Hemp fiber (15wt%), cotton fiber (35wt%), ultrafine high-shrinkage polyester fiber (fineness 1.0D, 25wt%), and polytetrafluoroethylene microfiber (25wt%) are blended into yarn and produced by high-density weaving process to a weight of 180g / m². 2 The outer fabric; Intermediate layer preparation: A mesh elastic moisture-wicking fabric with a pore size of 0.5mm is woven from spandex core-spun yarn; Inner layer treatment: Pure cotton woven fabric (weight 120g / m²) 2 In the preparation of the anti-wrinkle finishing solution of Example 7, a two-dip and two-ply method was adopted, the roll-off rate was controlled at 75%, and the mixture was pre-dried at 85°C for 4 min and then baked at 155°C for 120 s to obtain the inner layer fabric. Lamination: The outer fabric, middle fabric, and inner fabric are layered and aligned in that order, and environmentally friendly water-based polyurethane adhesive is applied at 15 dots / cm. 2The layers are dotted with a density of 0.5 mm and an adhesive dot diameter of 0.5 mm, and then bonded by hot pressing at 110℃ for 30 seconds to obtain a composite fabric. Post-processing: The composite fabric is cured in a constant temperature environment of 40℃ for 24 hours; after stretching and setting (temperature 150℃, fabric speed 20m / min) and quality inspection, the finished product is obtained.

[0077] Comparative Example 1 A linen composite fabric differs from Example 1 in that the outer layer is prepared differently, as detailed below: Hemp fiber (30wt%) and cotton fiber (70wt%) are blended into yarn and then produced using a high-density weaving process to achieve a weight of 180g / m². 2 The outer fabric.

[0078] Comparative Example 2 A linen composite fabric differs from Example 1 in that the outer layer is prepared differently, as detailed below: Hemp fiber (20wt%), cotton fiber (47wt%), and ultrafine high-shrinkage polyester fiber (1.0D fineness, 33wt%) are blended into yarn and then produced using a high-density weaving process to achieve a weight of 180g / m². 2 The outer fabric.

[0079] Comparative Example 3 A linen composite fabric differs from Example 1 in that the outer layer is prepared differently, as detailed below: Hemp fiber (20wt%), cotton fiber (47wt%), and polytetrafluoroethylene microfiber (fineness 1.0D, 33wt%) are blended into yarn and then woven using a high-density weaving process to produce a yarn with a weight of 180g / m². 2 The outer fabric.

[0080] Comparative Example 4 A linen composite fabric differs from Example 1 in that the preparation of the intermediate layer is different; the intermediate layer is made by weaving pure cotton yarn into a mesh with a pore size of 0.5 mm.

[0081] Example 2 An easy-care waterproof cotton-linen composite fabric includes an outer layer, a middle layer, and an inner layer arranged sequentially from the outside to the inside, and the outer layer, middle layer, and inner layer are composited in a dot-matrix manner.

[0082] The outer layer is a high-density woven fabric. The blended yarn of the outer layer contains, by weight percentage, 15 wt% hemp fiber, 35 wt% cotton fiber, 25 wt% microfiber of superfine polyester fiber, and 25 wt% polytetrafluoroethylene microfiber.

[0083] The outer layer is further treated by padding, pre-drying, and baking with a waterproof finishing liquid prepared in Example 3.

[0084] The middle layer is an elastic moisture-wicking mesh fabric, which is a mesh structure made of spandex core-spun yarn.

[0085] The inner layer is a cotton woven fabric, which is prepared by padding, pre-drying and baking with an anti-wrinkle finishing liquid prepared in Preparation Example 7.

[0086] The preparation method of easy-care waterproof cotton-linen composite fabric is as follows: Outer layer preparation: Hemp fiber (15wt%), cotton fiber (35wt%), ultrafine high-shrinkage polyester fiber (1.0D fineness, 25wt%), and polytetrafluoroethylene microfiber (25wt%) are blended into yarn and then produced using a high-density weaving process to achieve a weight of 180g / m². 2 The blended fabric was dipped and rolled in the waterproof finishing liquid of Preparation Example 3, with the roll-off rate controlled at 80%, pre-dried at 90°C for 4 min, and then baked at 130°C for 3 min to obtain the outer fabric. Intermediate layer preparation: A mesh elastic moisture-wicking fabric with a pore size of 0.5mm is woven from spandex core-spun yarn (20wt% spandex content); Inner layer treatment: Pure cotton woven fabric (weight 120g / m²) 2 In the preparation of the anti-wrinkle finishing solution of Example 7, a two-dip and two-ply method was adopted, the roll-off rate was controlled at 75%, and the mixture was pre-dried at 85°C for 4 min and then baked at 155°C for 120 s to obtain the inner layer fabric. Lamination: The outer fabric, middle fabric, and inner fabric are layered and aligned in that order, and environmentally friendly water-based polyurethane adhesive is applied at 15 dots / cm. 2 The layers are dotted with a density of 0.5 mm and an adhesive dot diameter of 0.5 mm, and then bonded by hot pressing at 110℃ for 30 seconds to obtain a composite fabric. Post-processing: The composite fabric is cured in a constant temperature environment of 40℃ for 24 hours; after stretching and setting (temperature 150℃, fabric speed 20m / min) and quality inspection, the finished product is obtained.

[0087] Comparative Example 5 An easy-care waterproof cotton-linen composite fabric, which differs from Example 2 in that the waterproof finishing liquid used in the preparation of the outer layer is the same as that prepared in Preparation Example 10.

[0088] Example 3 An easy-care waterproof cotton-linen composite fabric differs from Example 2 in that the outer layer preparation process is as follows: Hemp fiber (15wt%), cotton fiber (35wt%), ultrafine high-shrinkage polyester fiber (1.0D fineness, 25wt%), and polytetrafluoroethylene microfiber (25wt%) are blended into yarn and then produced using a high-density weaving process to achieve a weight of 180g / m². 2The blended fabric was prepared by dipping and padding in the waterproof finishing solution of Preparation Example 3, controlling the padding rate to 80%, and baking at 130°C for 3 minutes to obtain the outer fabric.

[0089] Example 4 An easy-care waterproof cotton-linen composite fabric, which differs from Example 2 in that the anti-wrinkle finishing liquid used for the inner layer treatment was prepared in Preparation Example 10.

[0090] Example 5 An easy-care waterproof cotton-linen composite fabric differs from Example 2 in that its inner layer treatment process is as follows: Pure cotton woven fabric (weight 120g / m²) 2 In the preparation of the anti-wrinkle finishing solution of Example 7, a two-dip and two-ply method was used to control the roll-off rate to 75%, and then it was baked at 155°C for 120s to obtain the inner layer fabric.

[0091] Example 6 A new type of easy-care waterproof cotton-linen composite fabric differs from Example 2 in that the composite process employs a full-coverage adhesive coating process, as detailed below: The same environmentally friendly waterborne polyurethane polyurethane dispensing agent as in Example 2 was used, with deionized water added to adjust the viscosity to 300 cP. Apply adhesive evenly to both sides of the intermediate layer mesh fabric, with a coating amount of 30±2g / m. 2 ; The outer layer fabric, middle layer fabric, and inner layer fabric are stacked in that order and then hot-pressed and cured at 110°C for 30 seconds to obtain a composite fabric; Example 7 An easy-care waterproof cotton-linen composite fabric differs from Example 2 in that the fineness of the ultrafine polyester fibers used in the preparation of the outer layer is 0.5D.

[0092] Example 8 An easy-care waterproof cotton-linen composite fabric, which differs from Example 2 in that the fineness of the ultrafine polyester fiber used in the preparation of the outer layer is 1.5D.

[0093] Example 9 An easy-care waterproof cotton-linen composite fabric differs from Example 2 in that the fineness of the ultrafine polyester fibers used in the preparation of the outer layer is 2.5D.

[0094] Example 10 An easy-care waterproof cotton-linen composite fabric, which differs from Example 2 in that the waterproof finishing liquid used in the preparation of the outer layer is the same as that prepared in Example 4.

[0095] Example 11 An easy-care waterproof cotton-linen composite fabric, which differs from Example 2 in that the waterproof finishing liquid used in the preparation of the outer layer is the same as that prepared in Example 5.

[0096] Example 12 An easy-care waterproof cotton-linen composite fabric, which differs from Example 2 in that the anti-wrinkle finishing liquid used in the inner layer treatment is the same as that prepared in Example 8.

[0097] Example 13 An easy-care waterproof cotton-linen composite fabric, which differs from Example 2 in that the anti-wrinkle finishing liquid used in the inner layer treatment is the same as that prepared in Example 9.

[0098] Example 14 An easy-care waterproof cotton-linen composite fabric differs from Example 2 in that the outer layer preparation process is as follows: Hemp fiber (12wt%), cotton fiber (28wt%), ultrafine high-shrinkage polyester fiber (1.0D fineness, 40wt%), and polytetrafluoroethylene microfiber (30wt%) are blended into yarn and then produced by high-density weaving process to a weight of 180g / m². 2 Blended fabrics; The blended fabric was dipped and rolled in the waterproof finishing solution of Preparation Example 3 in a single dip-and-roll manner, with the roll-off rate controlled at 80%. It was then pre-dried at 90°C for 4 minutes and then baked at 130°C for 3 minutes to obtain the outer fabric.

[0099] Example 15 An easy-care waterproof cotton-linen composite fabric differs from Example 2 in that the outer layer preparation process is as follows: Hemp fiber (18wt%), cotton fiber (42wt%), ultrafine high-shrinkage polyester fiber (1.0D fineness, 20wt%), and polytetrafluoroethylene microfiber (10wt%) are blended into yarn and then produced by high-density weaving process to a weight of 180g / m². 2 The blended fabric was prepared by dipping and padding in the waterproof finishing solution of Preparation Example 3, controlling the padding rate to 80%, pre-drying at 90°C for 4 min, and then baking at 130°C for 3 min to obtain the outer fabric.

[0100] Examples 1-14 and Comparative Examples 1-5 were tested, and the test items are as follows.

[0101] 1. Testing the outer waterproofing performance Hydrostatic pressure test according to AATCC127 and wettability test according to AATCC22.

[0102] 2. Outer waterproofing durability test After the composite fabric is washed 30 times according to ISO 6330, the above-mentioned outer layer hydrostatic pressure test is repeated.

[0103] 3. Inner layer skin-friendliness test According to GB / T3819 "Determination of Friction Properties of Textile Fabrics", the coefficient of friction was tested. The silicone-based synthetic skin on the bottom surface of the slider in the standard test component simulates human skin. The smaller the coefficient of friction, the smoother and more skin-friendly the inner surface is.

[0104] 4. Overall wrinkle resistance The wrinkle recovery angle was tested according to ISO 2313.

[0105] 5. Overall breathability Air permeability was tested according to ISO 9237.

[0106] 6. Overall softness The feel evaluation (subjective touch) is graded as very soft, soft, average, and stiff, with further details recorded for stiff and special feel.

[0107] The test results are shown in the table below.

[0108] Table 1. Test Results of Outer Layer Waterproofing and Waterproofing Durability Table 2. Results of Inner Layer Skin-Friendliness Test, Overall Anti-Wrinkle Test, and Overall Breathability Test Inner layer dynamic friction coefficient Wrinkle recovery angle (°) Air permeability (mm / s) Example 1 0.15 265 470 Example 2 0.15 275 472 Example 3 0.15 268 465 Example 4 0.35 247 462 Example 5 0.2 271 467 Example 6 0.15 267 443 Example 7 0.15 270 468 Example 8 0.15 276 470 Example 9 0.15 278 466 Example 10 0.15 276 472 Example 11 0.15 271 472 Example 12 0.15 270 470 Example 13 0.14 279 474 Example 14 0.15 270 479 Example 15 0.15 272 466 Comparative Example 1 0.15 160 510 Comparative Example 2 0.15 220 495 Comparative Example 3 0.15 210 505 Comparative Example 4 0.15 275 340 Comparative Example 5 0.15 252 452 Table 3. Overall Softness Test Results Feel Evaluation Example 1 soft Example 2 Very soft Example 3 The outer layer has localized, punctate, or blocky hardening. Example 4 hardened inner layer Example 5 Localized hardening of the inner layer Example 6 generally Example 7 Very soft Example 8 soft Example 9 generally Example 10 Very soft Example 11 Very soft Example 12 soft Example 13 Very soft Example 14 soft Example 15 soft Comparative Example 1 generally Comparative Example 2 generally Comparative Example 3 generally Comparative Example 4 soft Comparative Example 5 The outer layer is hard and feels sticky. Combine Table 1, Table 2, and Table 3.

[0109] The test results show: The hydrostatic pressure of the outer layer of Example 1 is greater than that of Comparative Example 4. The hydrostatic pressure of the outer layer of Comparative Example 4 is significantly greater than that of Comparative Examples 1 to 3. The water repellency rating of Example 1 is equal to that of Comparative Example 4. The water repellency rating of Example 1 is greater than that of Comparative Examples 1 to 4. Therefore, the waterproof performance of Example 1 is significantly better than that of Comparative Examples 1 to 3, and also better than that of Comparative Example 4. After washing 30 times, the hydrostatic pressure of Example 1 was greater than that of Comparative Example 4. After washing 30 times, the hydrostatic pressure of Comparative Example 4 was significantly greater than that of Comparative Examples 1-3. Therefore, the outer waterproof durability of Example 1 was significantly better than that of Comparative Examples 1-4. Comparative Example 1 and Comparative Examples 1-4: In Example 1, the outer layer is made of cotton fiber, linen fiber, microfiber, and a blend of cotton linen and microfiber; the middle layer is an elastic moisture-wicking mesh fabric; and the inner layer 2 is a wrinkle-resistant cotton woven fabric. The outer layer of Comparative Example 1 is a blend of cotton and linen fibers, and its outer layer has no waterproof properties. The outer layer of Comparative Example 2 was obtained by blending cotton fiber, linen fiber and ultrafine polyester fiber; Comparative Example 3 has an outer layer made of a blend of cotton fiber, linen fiber and polytetrafluoroethylene microfiber; The cotton woven mesh fabric of Comparative Example 4 was used as the intermediate layer.

[0110] Therefore, it can be verified that the outer layer of the composite fabric in Example 1 adopts a woven high-density structure, which physically reduces the porosity between yarns and increases the hydrostatic pressure required for water penetration; the ultrafine polyester provides the skeleton of the outer layer, increasing yarn strength and wrinkle resistance, and its high shrinkage characteristics help to further tighten the fabric structure and reduce porosity during finishing; the PTFE microfibers have low surface energy, and after being interwoven with other fibers, they are evenly distributed in the outer layer, forming a lasting "micro-fleece" effect on the outer layer surface, which greatly enhances water repellency, making it difficult for water droplets to penetrate; thus, the outer layer achieves... The core function is waterproofing; the middle layer is an elastic moisture-wicking mesh fabric, which provides slight elasticity, increases the fabric's wearing comfort and shape recovery, and reduces wrinkles; and utilizes the hydrophobicity of the spandex core and the hydrophilicity of the covering cotton to create a capillary effect, quickly absorbing sweat from the inner layer and guiding it to the outer layer for dissipation, keeping the wearer dry, thus playing a role in moisture wicking and bonding, and it does not absorb water itself, so it will not add weight; the inner layer uses cotton woven fabric, retaining the maximum softness, comfort and natural texture of the surface against the skin, while the wrinkle-resistant finish greatly reduces the difficulty of care; Therefore, the easy-care waterproof cotton-linen composite fabric of this application has an outer layer responsible for core protection, a middle layer that plays a role in moisture wicking and connection, and an inner layer that ensures skin-friendly comfort. The dot-matrix composite method ensures structural strength while preserving the original pores of each layer of material to the greatest extent, so that the fabric as a whole maintains excellent breathability.

[0111] Comparing Example 1, Example 2 and Comparative Example 5, it can be seen that... Example 2 is a further improvement on Example 1. Before the outer layer, intermediate layer and inner layer are laminated, the outer layer is first impregnated, pre-dried and baked with the waterproof finishing liquid represented by Preparation Example 3 of this application. Comparative Example 5 is based on Example 1. Before the outer layer, intermediate layer and inner layer are laminated, the outer layer is first impregnated, pre-dried and baked with a waterproof finishing liquid of the nano-wax crystal emulsion type.

[0112] In the test results, The hydrostatic pressure of the outer layer of Example 2 after 30 washes is greater than that of Comparative Example 5 and significantly greater than that of Example 1. Therefore, the waterproofness and waterproof durability of the composite fabric of Example 2 are significantly improved compared with Example 1. At the same time, the air permeability and wrinkle recovery angle of Example 2 are still similar to those of Example 1. The overall softness test results of Example 2 remain soft, and the outer layer does not harden.

[0113] The hydrostatic pressure of the outer layer of Comparative Example 5 and the hydrostatic pressure after 30 washes were greater than those of Example 1. However, the hydrostatic pressure of the outer layer of Comparative Example 5 after 30 washes was significantly lower than the initial hydrostatic pressure. The air permeability of Comparative Example 5 was significantly lower than that of Example 1. The wrinkle recovery angle of Comparative Example 5 was significantly lower than that of Example 1. In the overall softness test results of Comparative Example 5, the outer layer was hard and had a sticky feel.

[0114] Furthermore, considering Examples 10-11, which are significantly better than Example 1, the overall softness test results of Examples 10-11 still show that the outer layer remains soft without any hardening. This indicates that when the waterproof finishing liquid of this application is used to impart better waterproof performance to the outer fabric, it ensures that the finished fabric remains soft to the touch, without any stickiness or stiffness, and its breathability is not affected. This overcomes the shortcomings of traditional nano-wax crystal emulsion finishing liquids, which have a short-lasting effect and become sticky.

[0115] Comparing Examples 2 and 3, it can be seen that the hydrostatic pressure of the outer layer in Example 3 and the hydrostatic pressure after 30 washes are slightly lower than those in Example 2. The wrinkle recovery angle and air permeability of Example 3 are slightly lower than those in Example 2. In the softness test of Example 3, some points and blocks of the outer layer are hardened in the hand feel evaluation. In addition, during the production process, it can be found that the outer layer also has local color difference or frosty white.

[0116] The reason is due to: In Example 3, the effective components of the outer waterproof finishing liquid underwent a "migratory" phenomenon during the preparation process. In Example 3, the outer fabric was directly baked after impregnation. The excessively high temperature caused a large amount of moisture on the fabric surface to rapidly migrate from unsaturated areas to saturated areas and from high-temperature areas to low-temperature areas. When the moisture migrated, it carried along dissolved or suspended finishing agent components (such as nano-silica particles, silanes, polyurethanes, etc.). This ultimately leads to uneven distribution of the finishing agent on the fiber surface, such as excessive accumulation at yarn intersections and fabric folds, while insufficient accumulation in smooth areas; areas with concentrated finishing agent feel stiff, have color differences and a frosty white appearance, and may be too waterproof but not breathable; areas with insufficient finishing agent have poor waterproofing and become weak points for water seepage.

[0117] In Example 2, a pre-drying process with a transition temperature is added between padding and baking. This is not simply drying out moisture, but a "controllable rapid fixation process". It uses gentle heat input to evaporate moisture and pre-fix the waterproof finishing liquid components on the fiber surface in situ and evenly to the maximum extent before entering the high-temperature baking stage. This completely eliminates the "migratory" phenomenon caused by violent evaporation of moisture, ensuring that the final hydrophobic layer is uniform and consistent, and avoiding problems such as uneven waterproofing, stiff and rough fabric feel, and color difference.

[0118] Comparing Examples 1, 2, and 4, it can be seen that the wrinkle recovery angle of Examples 2 and 4 is larger than that of Example 1, and the wrinkle resistance of Examples 2 and 4 is enhanced compared with that of Example 1. On the other hand, the inner layer dynamic friction coefficient of Example 4 is significantly larger than that of Example 2, and in the overall softness test, Example 4 is generally stiff, especially the inner side is significantly stiff.

[0119] Furthermore, considering Examples 12-13, the results of Examples 12-13 are significantly greater than those of Example 1. At the same time, the coefficient of dynamic friction of the inner layer of Examples 12-13 is less than that of Example 4. The overall softness test results of Examples 12-13 remain soft, without any hardening.

[0120] Therefore, the anti-wrinkle finishing liquid of this application performs anti-wrinkle finishing on the inner layer, which can simultaneously achieve anti-wrinkle and softness, giving the inner layer a lasting anti-wrinkle effect and excellent soft touch.

[0121] Comparing Examples 2 and 5, it can be seen that the coefficient of dynamic friction of the inner layer in Example 5 is greater than that in Example 2, the wrinkle recovery angle of Example 5 is smaller than that in Example 2, and the overall softness test of Example 5 is not as good as that of Example 2. This is because in Example 5, the inner layer was directly baked after padding in the anti-wrinkle treatment, causing migration and initial concentration of the anti-wrinkle finishing solution, resulting in insufficient cross-linking and silicone oil grafting reactions. Furthermore, the rapid temperature change led to fiber strength damage, thus reducing the performance of Example 5. Therefore, in the anti-wrinkle finishing process of the inner layer of this application, it is better to perform a pre-baking treatment at a transition temperature after padding in the anti-wrinkle finishing solution, followed by baking.

[0122] Comparing Examples 2 and 6, it can be seen that the difference lies in the composite process. Example 2 uses dot-coating composite, while Example 6 uses surface coating composite. In the test results, the air permeability of Example 2 is greater than that of Example 6, and the overall softness evaluation of Example 2 is better than that of Example 6 in terms of hand feel. Therefore, this application uses dot-coating for composite, which achieves a firm bond only at discrete points, leaving most of the area suspended. This ensures that the overall air permeability and softness of the composite fabric are hardly damaged, avoiding the problem of stiff and non-breathable fabric caused by full-area coating in traditional composite processes.

[0123] Comparing Examples 2 and 7-9, the fineness of the ultrafine polyester fiber used in Example 7 was 0.5D, the fineness of the ultrafine polyester fiber used in Example 2 was 1D, the fineness of the ultrafine polyester fiber used in Example 8 was 1.5D, and the fineness of the ultrafine polyester fiber used in Example 9 was 2.5D.

[0124] The test results show that the hydrostatic pressure of the outer layer, from high to low, is as follows: Example 2, Example 8, Example 7, and Example 9. After washing 30 times, the hydrostatic pressure, from high to low, is as follows: Example 2, Example 8, Example 7, and Example 9. Therefore, the fineness of the ultrafine polyester in this application is preferably between 0.5D and 1.5D.

[0125] In addition, during the research and development process of this application, there are other superior fiber ratios for the outer layer, such as in Examples 14 and 15. The hydrostatic pressure, hydrostatic pressure after 30 washes, and air permeability of the outer layer are significantly improved compared with the comparative examples 1 to 3 of the prior art. Moreover, the surface does not harden or become sticky. Therefore, the fiber ratio of the outer layer in the composite fabric of this application is controlled at 40-60 wt% for hemp and cotton fibers, 20-40 wt% for ultrafine polyester fibers, and 10-30 wt% for polytetrafluoroethylene microfibers. In this way, the outer layer fabric can still maintain excellent waterproofness, durable waterproofness, and breathability.

[0126] This specific embodiment is merely an explanation of the present invention and is not intended to limit the present invention. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but as long as they are within the scope of protection claimed by the present invention, they are protected by patent law.

Claims

1. An easy-care waterproof cotton-linen composite fabric, characterized in that, It includes an outer layer, a middle layer, and an inner layer arranged sequentially from the outside to the inside, and the outer, middle, and inner layers are composited in a point-like composite manner. The outer layer is a high-density woven fabric. In the blended yarn of the outer layer, by weight percentage, hemp fiber and cotton fiber account for 40-60 wt%, ultrafine polyester fiber accounts for 20-40 wt%, and polytetrafluoroethylene microfiber accounts for 10-30 wt%. The middle layer is an elastic moisture-wicking mesh fabric, which is a mesh structure made of spandex core-spun yarn; The inner layer is a cotton woven fabric that has undergone anti-wrinkle treatment.

2. The easy-care waterproof cotton-linen composite fabric according to claim 1, characterized in that, The outer fabric is treated by padding and baking with a waterproof finishing liquid, the composition of which is as follows by mass percentage: Epoxy-modified nano-silica dispersion 5~10wt%, Octadecyltriethoxysilane 1.5~3.5 wt%, 8-15 wt% aqueous polyurethane dispersion Catalyst 0.5~1.5wt%, The remainder is deionized water.

3. The easy-care waterproof cotton-linen composite fabric according to claim 2, characterized in that, After the outer fabric is impregnated with a waterproof finishing liquid, it is first pre-dried at 80~100℃ for 3~5 minutes, and then baked at 120~140℃ for 2~3 minutes.

4. The easy-care waterproof cotton-linen composite fabric according to claim 1, characterized in that, The anti-wrinkle finishing of the inner layer includes padding in an anti-wrinkle finishing solution and baking; the anti-wrinkle finishing solution comprises, by mass percentage: 1,2,3,4-butanetetracarboxylic acid 4.0~6.0wt%; Polymaleic acid 1.0~2.0 wt%; Epoxy-modified amino silicone oil microemulsion 2.0~4.0 wt% Sodium hypophosphite 2.0~3.0 wt%; Penetrant 0.1~0.3wt%; The remainder is deionized water.

5. The easy-care waterproof cotton-linen composite fabric according to claim 4, characterized in that, The anti-wrinkle finishing process of the inner layer is as follows: after padding in the anti-wrinkle finishing solution, it is first pre-dried at 80~90℃ for 3~5 minutes, and then baked at 150~160℃ for 90~150 seconds.

6. The easy-care waterproof cotton-linen composite fabric according to claim 1, characterized in that, The fineness of the ultrafine polyester is between 0.5D and 1.5D.

7. The easy-care waterproof cotton-linen composite fabric according to claim 1, characterized in that, The dot-like bonding method is environmentally friendly water-based polyurethane dot adhesive bonding; the density of the dot-like bonding dots is 5~25 dots / cm. 2 .

8. The method for manufacturing the easy-care waterproof cotton-linen composite fabric according to any one of claims 1 to 7, characterized in that, Includes the following steps: S1 Raw material preparation: Prepare the outer layer blended yarn and weave it into a high-density outer layer fabric; Prepare the middle layer of elastic moisture-wicking mesh fabric; Prepare the inner layer fabric and perform anti-wrinkle finishing; S2 outer layer finishing: The outer layer fabric is treated with a durable waterproof finish, including padding with a waterproof finishing agent, drying and high-temperature baking; S3 layered composite: The outer, middle and inner layers, after being prepared, are stacked in sequence. S4 dot-matrix lamination: Using ultrasonic lamination equipment or dispensing lamination equipment, the three-layered materials are bonded together in a dot-matrix manner to form a composite fabric. S5 Curing and Shaping: The composite fabric is cured in a constant temperature environment, and then shaped and inspected.

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