A lightweight functional composite fabric and its manufacturing process

Abstract

The present invention provides a lightweight functional composite fabric and its manufacturing process, belonging to the technical field of textiles. First, the present invention weaves a fabric with nylon yarn, then performs dyeing treatment and water-repellent finishing, then composites with a polyurethane film, and finally composites a warp-knitted nylon mesh fabric or a printed fabric with a texture imitating knitting warp on the surface of the film to obtain a lightweight functional composite fabric. By optimizing conditions such as water-repellent finishing and polyurethane film, the obtained fabric has the characteristics of high tear strength, good abrasion resistance, waterproof and moisture-permeable, and excellent washability, can meet the fabric requirements of outdoor sportswear, and has a good market prospect.

Description

Technical Field

[0001] The present invention belongs to the technical field of textiles, and in particular relates to a lightweight functional composite fabric and a manufacturing process thereof. Background Art

[0002] For those who like to play outdoors, jackets are a very familiar item. Their excellent performance and fashionable and varied styles make them a must-have for almost every outdoor enthusiast. In recent years, as the relationship between outdoor sports and fashion trends has become closer, more and more people have begun to fall in love with this comfortable and simple style, which can help them switch between various scenes such as outdoor and urban scenes more easily. Whether it is hiking in the suburbs or high-altitude mountainous areas, all levels of wind and rain may be encountered, and jackets can instantly and once meet the needs of windproof and breathable. The fabric used for jackets is generally made of a composite film on the surface of ordinary fabrics. For example, patent CN114714677A discloses a process for making composite outdoor fabrics, which includes laminating and curing the outdoor fabric with a composite film to obtain a composite outdoor fabric; the resulting fabric has high performance such as water resistance, high peel strength, anti-pilling, high strength and wear resistance, waterproof and breathable, aging resistance, and good resistance to yarn cracking.

[0003] In spring and summer, jackets must meet the requirements of waterproof and breathable performance while also being lightweight. Lightweight equipment can reduce the load on the body. More and more outdoor enthusiasts choose to carry lightweight outdoor equipment when challenging long-distance hiking routes.

[0004] The national standard for outdoor jackets, GB / T32614-2016, "Outdoor Sportswear," requires that washed garments exhibit the following appearance requirements: no flaking, debonding, or blistering on bonded areas; no damage, peeling, rusting, deformation, or noticeable discoloration on other areas after washing; and no unraveling at seams. While there's no perfect definition for a spring / summer jacket, common features must be comfort, breathability, windproof, rainproof, and moisture-permeable. Achieving lightweighting requires adjusting the material to ensure that the required functionality is maintained despite the weight reduction. Current research on outdoor fabrics is focused on developing a fabric that can function as a lightweight outdoor garment while also meeting the requirements of outdoor fabrics.

[0005] Patent CN111074642A discloses a manufacturing process for lightweight, high-performance outdoor equipment fabrics, including: organizing yarns into multi-line grid fabrics in a predetermined weaving method, then dyeing the above fabrics at a temperature of 50-110°C, using a water-spraying auxiliary agent to spray the dyed fabrics with water, and finally coating them. The resulting fabrics have high tear strength and good aging resistance.

[0006] Patent CN115821583A discloses a method for preparing lightweight polyester fabric for outdoor sportswear. The method comprises wetting and modifying the polyester fabric, then immersing it in a UV-resistant finishing solution for padding; drying the padded polyester fabric, then calendering it in a water-sprayed resin solution. The UV-resistant finishing solution is prepared by: dispersing sodium alginate, carboxymethyl chitosan, and a UV absorber in water, homogenizing the mixture to form a UV absorber coating solution; adding the mixture dropwise to a calcium chloride solution to form a UV absorber coating solution; and adding the padding resin dispersion to the mixture to obtain the UV-resistant finishing solution. The resulting polyester fabric exhibits excellent UV resistance, high UV resistance, and long durability, while maintaining considerable air permeability, moisture permeability, and water repellency.

[0007] However, current jacket fabrics suffer from poor bonding between finishing solutions and fabric fibers. This weakens the fabric's performance after repeated washing, especially for nylon fabrics widely used in outdoor sportswear. Furthermore, lightweight fabrics lack the strength to meet the demands of outdoor sports. Therefore, there is a need for a lightweight composite fabric with excellent properties, including weft-direction elasticity, high tear strength, abrasion resistance, and water pressure resistance. Summary of the Invention

[0008] The present invention aims to address the deficiencies of the prior art and provide a lightweight functional composite fabric and a manufacturing process thereof. The composite fabric has weft-wise mechanical elasticity, and the finished fabric has high tear strength, good abrasion resistance, waterproof and breathable properties, and excellent washability.

[0009] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0010] On the one hand, a lightweight functional composite fabric includes a nylon fabric, a polyurethane film and a base fabric; wherein the material of the polyurethane film includes polyurethane, light calcium carbonate and sodium palmitate / sodium carbenoxolate modified hydrotalcite.

[0011] Furthermore, the weight of the lightweight functional composite fabric is 55-85g / m 2 .

[0012] Furthermore, the warp yarn of the nylon fabric is 12-20D nylon DTY, the yarn F number is 6F; the weft yarn is 12-20D nylon mechanical stretch DTY, the yarn F number is 10F, the fabric density is: warp yarn density 180-240 strands / inch, weft yarn density 160-190 strands / inch, and the fabric is plaid style.

[0013] Nylon has good mechanical properties, high mechanical strength, good toughness and wear resistance, and good self-lubricating properties. The present invention selects nylon yarns of different specifications to make the resulting fabric have permanent comfortable elasticity and durability, and is more conducive to the subsequent processes.

[0014] Furthermore, in the polyurethane film, the polyurethane is at least one of polyether-type polyurethane and polyester-type polyurethane.

[0015] Furthermore, in the polyurethane film, the sodium palmitate / glycyrrhetate-modified hydrotalcite is prepared by the following method: Disperse sodium palmitate and glycyrrhetate in 10 - 20 times by mass of water, add hydrotalcite, heat up to 70 - 80 °C, adjust the pH to 5.5 - 6, stir and react for 1 - 2 h, filter by suction, wash with water, and dry to obtain the sodium palmitate / glycyrrhetate-modified hydrotalcite.

[0016] Preferably, the hydrotalcite in the sodium palmitate / glycyrrhetate-modified hydrotalcite is selected from at least one of aluminum-magnesium-barium hydrotalcite and aluminum-magnesium hydrotalcite.

[0017] Preferably, the mass ratio of sodium palmitate to glycyrrhetate is 5 - 7:1; the total mass ratio of sodium palmitate and glycyrrhetate to hydrotalcite is 8 - 10:10.

[0018] The surface and interlayer structure of hydrotalcite contain a large number of hydroxyl groups, making it have a certain hydrophilicity, and hydrotalcite is bound together by hydrogen bonding between adjacent ones during the drying process, resulting in the easy agglomeration of hydrotalcite and the reduction of product performance. In the present invention, sodium palmitate and glycyrrhetate are used to modify hydrotalcite. The carboxyl groups generated by sodium palmitate and glycyrrhetate in water react with the hydroxyl groups on the surface of hydrotalcite, preventing the adjacent hydrotalcite from binding together by hydrogen bonding during the drying process, enhancing the steric hindrance between particles, preventing the performance decline caused by the agglomeration of hydrotalcite, and controlling the mass of sodium palmitate and glycyrrhetate. This can not only further improve the dispersion uniformity, replace the hydrophilic hydroxyl groups, introduce hydrophobic ester groups and long-chain alkanes, make hydrotalcite have higher hydrophobicity, improve the waterproof property of the film, but also help to enhance the strength, wear resistance and water-washing resistance.

[0019] Furthermore, the polyurethane film contains, by mass percentage: 84 - 92% of polyurethane, 4 - 10% of light calcium carbonate, and 2 - 6% of sodium palmitate / glycyrrhetate-modified hydrotalcite. Preferably, the polyurethane film contains, by mass percentage: 88 - 90% of polyurethane, 6 - 8% of light calcium carbonate, and 3 - 4% of sodium palmitate / glycyrrhetate-modified hydrotalcite.

[0020] Furthermore, the polyurethane film is prepared by the following method: Mix polyurethane, light calcium carbonate, and sodium palmitate / glycyrrhetate-modified hydrotalcite, add them to an organic solvent, stir at 20 - 35 °C for 0.5 - 1 h, scrape and coat on a release paper to form a film, and then wind and store for later use. The grammage of the polyurethane film is 12 - 15 g / m 2 .

[0021] Preferably, the organic solvent is at least one of N,N-dimethylformamide, toluene, methyl ethyl ketone, ethyl acetate, and dimethyl carbonate, and the amount of the organic solvent used is 3-4 times the total amount of the polyurethane film material.

[0022] The polyurethane film of the present invention is composed of polyurethane, light calcium carbonate, and sodium palmitate / glycyrrhizinate modified hydrotalcite. The hard segment part of the polyurethane is composed of hydrophobic groups, which can block the passage of water droplets and play a waterproof role; the soft segment part is composed of hydrophilic groups, which can absorb the moisture emitted by the human body and quickly transfer the water vapor from the inside to the outside through "adsorption-diffusion-desorption". The cooperation of polyurethane with light calcium carbonate and modified hydrotalcite makes the obtained film have high density, good moisture permeability, and has the characteristics of waterproof, moisture-permeable, windproof, high tear resistance, excellent wear resistance and water resistance.

[0023] On the other hand, a preparation method of a lightweight functional composite fabric includes the following steps:

[0024] (1) Weave the warp polyamide DTY and the weft polyamide mechanical stretch DTY into a fabric;

[0025] (2) Dye the fabric with acid dyes;

[0026] (3) Perform water-repellent finishing on the fabric using a water-repellent finishing agent;

[0027] (4) Compound the polyurethane film with PUR moisture-curing hot melt adhesive;

[0028] (5) Compound the warp-knitted polyamide mesh fabric or imitate the warp-knitted texture printing with PUR moisture-curing hot melt adhesive.

[0029] Furthermore, in the step (1), the polyamide yarn is made into a fabric through warping, sizing, weaving, and desizing. The specific steps include: The polyamide yarn is warped into a full shaft by a warping machine at a speed of 450-500 m / min; the yarn is sized by a sizing machine at a speed of 100-150 m / min; using a water-jet loom, at a rotational speed of 500 rpm, through the forward and backward movement of the reed and the up and down movement of the heddle frame, the warp and weft yarns are interwoven to form a gray cloth with a checkered texture; the gray cloth is desized without tension at a speed of 10-25 m / min and at 90-95 °C to wash the sizing and impurities on the fiber surface clean to obtain the fabric. Select a non-tension desizing machine for operation. This desizing method can remove impurities on the fiber surface more thoroughly, cause less damage to the fiber, and at the same time enable the weft polyamide mechanical stretch yarn to better naturally shrink and obtain a better mechanical elastic effect.

[0030] Preferably, the desizing auxiliaries used in the desizing process include: 8 - 12 g / L of NaOH, 2 - 4 g / L of degreasing agent, 3 - 6 g / L of scouring agent, and 0.5 - 1 g / L of carbonate. The scouring agent is secondary alkyl sulfonate. In the present invention, the compounding of NaOH, degreasing agent, scouring agent, and carbonate is used as the desizing auxiliary to improve the desizing effect, thereby improving the dyeing efficiency, facilitating the subsequent lamination of the fabric with the polyurethane film, and thus improving the performance of the fabric.

[0031] Further, the dyeing step is as follows: Dissolve the auxiliary in water, then add acid dyes and mix well to obtain the dyeing agent. Put the desized grey fabric into the dyeing agent, keep it warm at 50 - 55 °C for 30 - 40 min, then heat it up to 70 - 75 °C at a rate of 0.5 - 1 °C / min, and then heat it up to 100 - 105 °C at a rate of 1 - 1.5 °C / min and keep it warm for 20 - 30 min, and then cool it down to below 50 °C at a rate of 1.5 - 2 °C / min to complete dyeing, and feed it into the stenter at a speed of 40 - 50 m / min and dry it at 180 - 190 °C.

[0032] Preferably, the auxiliary is at least one of amine compounds, phosphates, and surfactants. The amine compound is at least one of tetraethylammonium hydroxide and tetrabutylammonium hydroxide; the phosphate is sodium phosphate or potassium phosphate; the surfactant is at least one of sodium dodecyl sulfate, dodecyl ethoxysulfobetaine, dodecyl hydroxypropyl sulfobetaine, dodecyl sulfopropyl betaine, tetradecanamide propyl hydroxypropyl sulfobetaine, and lecithin.

[0033] Further, the water - repellent finishing step is as follows: Pad the fabric with a water - repellent finishing agent, with a pressure of 2 - 3 kg / cm 2 , after non - contact pre - drying, then enter the oven of the orbital stenter at 180 - 195 °C and 40 - 50 m / min for heat setting for 1 - 5 min.

[0034] Preferably, the water - repellent finishing agent contains: 50 - 70 g / L of fluorine - free water - repellent agent, 8 - 15 g / L of cross - linker, 0.5 - 2 g / L of penetrant, 2 - 5 g / L of sodium tartrate, and 0.5 - 2 g / L of benzyltrimethylammonium hydroxide. The fluorine - free water - repellent agent is selected from acrylic copolymers, ZJ - XR88 fluorine - free water - repellent agent, The crosslinking agent is selected from at least one of N-methylol melamine, isocyanate, isomeric alcohol polyoxyethylene ether sulfated castor oil, alkyl sulfonate, alkyl benzene sulfonate, alkyl sulfate sodium, secondary alkyl sulfonate, secondary alkyl sulfate sodium, alkyl naphthalene sulfonate, alkyl succinate sulfonate, sodium sulfamate, fatty alcohol polyoxyethylene ether, alkylphenol polyoxyethylene ether, and phosphate ester compounds; the penetrant is at least one of AEP, OEP-70, JFC-1, JFC-2, JFC-E, JFC-M, OP-4, polyoxyethylene alkylamine, and sorbitan ester. In the water repellent finishing agent of the present invention, sodium tartrate and benzyltrimethylammonium hydroxide are added, which helps the water repellent finishing agent to quickly spread into a film on the fiber surface, bind more firmly to the fabric, and improve the waterproof performance and washability of the fabric.

[0035] Further, the steps for the composite polyurethane film are as follows: The PUR moisture-curing hot melt adhesive is dot-coated on the fabric, and the amount of glue applied is 6-7 g / m 2 , and it is compounded with the polyurethane film at 80-90 °C.

[0036] Further, the steps for the composite warp-knitted nylon mesh fabric are as follows: The PUR moisture-curing hot melt adhesive is dot-coated on the fabric, and the amount of glue applied is 6-7 g / m2, and it is compounded with a 10D warp-knitted nylon mesh fabric at 80-90 °C.

[0037] Further, the steps for the imitation knitted warp-knit texture printing are as follows: First, a printing roller with the texture of an imitation knitted warp-knit base fabric is prepared on the surface of a metal roller by laser plate-making technology. The laser plate-making technology has good microscopic morphology reproducibility, high-definition patterns, and the width, depth, and distribution of microscopic pits can be precisely controlled. Then, the mixed printing material is applied to the surface of the polyurethane film through a gravure roller. The printing material is prepared by dissolving a polyurethane hydrophilic moisture-permeable resin, black ink, and fumed silica with a mass ratio of 100:15:3 in an organic solvent, and the viscosity of the printing material is 800-1000 CPS. The organic solvent is any one of N,N-dimethylformamide, toluene, methyl ethyl ketone, ethyl acetate, and dimethyl carbonate.

[0038] Compared with the prior art, the present invention has the following beneficial effects:

[0039] (1) In the present invention, the warp yarn is made of nylon DTY yarn, and the weft yarn is made of nylon mechanical stretch DTY yarn to form a fabric, and then it is compounded with a polyurethane film to obtain a lightweight functional composite fabric. The finished composite fabric has good elastic elongation effect in the weft direction, and has the characteristics of high tear strength, good abrasion resistance, waterproof and moisture-permeable, and excellent washability, which can meet the fabric requirements of outdoor sports clothing and has a good market prospect.

[0040] (2) The present invention prepares a polyurethane film using polyurethane, light calcium carbonate, and sodium palmitate / carbenoxolone modified hydrotalcite as raw materials. By controlling the ratio of the three to cooperate with each other, the resulting film has high density, good moisture permeability, and waterproof, moisture-permeable, and windproof properties. The sodium palmitate / carbenoxolone modified hydrotalcite has good dispersibility and hydrophobicity, which can further improve the waterproof and moisture-permeable properties and help enhance the strength, abrasion resistance, and washability of the fabric.

[0041] (3) The water-repellent finishing agent of the present invention contains a fluorine-free waterproof agent, a cross-linking agent, a penetrant, sodium tartrate, and benzyltrimethylammonium hydroxide. Among them, sodium tartrate and benzyltrimethylammonium hydroxide cooperate with other components, which helps the water-repellent finishing agent to quickly spread and form a film on the fiber surface, making the combination with the fabric more firm, and improving the waterproof performance and washability of the fabric. Description of the Drawings

[0042] Figure 1 is the fabric structure diagram of the greige cloth in Example 1;

[0043] Figure 2 is the FTIR diagram of sodium palmitate / carbenoxolone modified hydrotalcite in Example 1; Curve a in the figure represents unmodified hydrotalcite, and curve b represents sodium palmitate / carbenoxolone modified hydrotalcite;

[0044] Figure 3 is the fabric structure diagram of the greige cloth in Example 2;

[0045] Figure 4 is the schematic diagram of the imitation knitted warp-knitted texture in Example 3. Detailed Embodiments

[0046] The following non-limiting examples can enable those of ordinary skill in the art to more comprehensively understand the present invention, but do not limit the present invention in any way. The following content is only an exemplary illustration of the scope claimed by the present invention. Those skilled in the art can make various changes and modifications to the invention according to the disclosed content, and it should also fall within the scope claimed by the present invention.

[0047] The present invention will be further described below by way of specific examples. All chemical reagents used in the examples of the present invention are obtained through conventional commercial channels unless otherwise specified.

[0048] Example 1

[0049] [[ID=�5]]A method for preparing a lightweight functional composite fabric, comprising the following steps:

[0050] (1) Weaving a fabric from nylon yarn:

[0051] The nylon yarn is warped into a beam through a warping machine at a speed of 450 m / min, and then sized on a slasher at a speed of 100 m / min. Then, using a water jet loom, at a rotational speed of 500 rpm, through the forward and backward movement of the reed and the up and down movement of the heddle frame, the warp and weft yarns are interwoven to form a grey cloth with a check pattern (as Figure 1 shown). The warp yarn is 12D / 7F nylon DTY, and the weft yarn is 15D / 10F nylon DTY mechanical stretch yarn. The density of the grey cloth is: warp density 220 picks per inch, weft 178 picks per inch, and the weight of the grey cloth is 26 g / m 2 . The grey cloth is desized without tension at a speed of 10 m / min and 90 °C to clean the sizing agent and impurities on the fiber surface to obtain the fabric. The desizing auxiliaries include: 8 g / L of NaOH, 914 g / L of degreasing agent CL-9, 6 g / L of sodium dodecyl sulfate, and 0.5 g / L of sodium carbonate.

[0052] (2) Dissolve the auxiliary agent sodium dodecyl sulfate in water to form a 3% solution, add acid dyes according to the color required by the customer and mix well to obtain the dyeing agent. Put the desized grey cloth into the dyeing agent, keep it warm at 50 °C for 30 min, then heat it up to 70 °C at a rate of 0.5 °C / min, then heat it up to 100 °C at a rate of 1 °C / min and keep it warm for 20 min, and then cool it down to below 50 °C at a rate of 1.5 °C / min. Finally, feed it into the stenter at 40 m / min and dry it at 180 °C.

[0053] (3) Pad the fabric with a water repellent finishing agent, the pressure is 2 kg / cm 2 , pre-dry it without contact at 70 °C, and then enter the oven of the orbital stenter for heat setting at 190 °C and 40 m / min for 1.5 min. The water repellent finishing agent contains 50 g / L of ZJ-XR88 fluorine-free water repellent, 8 g / L of N-methylol melamine, 0.5 g / L of JFC-1 penetrant, 2 g / L of sodium tartrate, and 2 g / L of benzyl trimethyl ammonium hydroxide.

[0054] (4) Dot-apply the hot melt adhesive TL-5404D on the fabric, select a diamond-shaped compound roller, the amount of glue applied is 6 g / m 2 , and compound it with a polyurethane film at 85 °C.

[0055] The polyurethane film is prepared by the following method: Dissolve 5 parts by weight of sodium palmitate and 1 part by weight of sodium glycyrrhizinate in 100 parts by weight of water, add 7.5 parts of aluminum-magnesium hydrotalcite, heat up to 70 °C, adjust the pH to 5.5, stir and react for 1 h, filter by suction, wash with water, and dry to obtain sodium palmitate / sodium glycyrrhizinate modified hydrotalcite. Then, 30 parts of UE90AE10FR polyurethane, light calcium carbonate, and sodium palmitate / sodium glycyrrhizinate modified hydrotalcite are mixed in a ratio of 88:8:4, added to 70 parts of N,N-dimethylformamide, stirred at 30 °C for 1 h, and coated and baked into a film. The gram weight of the single film is 12 g / m 2 。

[0056] (5) Composite warp-knitted nylon mesh fabric: Dot-apply hot melt adhesive TL-5404D on the fabric, with a dotting amount of 7 g / m 2 , and composite it with 7D warp-knitted nylon mesh fabric at 85 °C. The gram weight of the fabric is 65 g / m 2 。

[0057] In this application, the sodium palmitate / sodium glycyrrhizinate modified hydrotalcite was tested by infrared spectroscopy, and the measured FTIR graph is as shown in Figure 2 。It can be seen from Figure 2 that curve a represents the unmodified hydrotalcite, curve b represents the modified hydrotalcite. Curves a and b show stretching and bending vibration peaks of the interlayer hydroxyl groups of the hydrotalcite near 3460 cm -1 , 1645 cm -1 . Curve b shows symmetric and asymmetric stretching vibration absorption peaks of saturated alkanes near 2937 cm -1 , 2860 cm -1 , and an asymmetric stretching vibration peak of the -COO- bond near 1543 cm -1 . The above results indicate that the modification of hydrotalcite with sodium palmitate and sodium glycyrrhizinate was successful.

[0058] Example 2

[0059] A preparation method of a lightweight functional composite fabric, comprising the following steps:

[0060] (1) Weaving nylon yarn into fabric:

[0061] Weave the nylon yarn into a full shaft through a warping machine at a speed of 500 m / min, and then size the yarn through a sizing machine at a speed of 150 m / min. Then, use a water jet loom, at a rotational speed of 500 rpm, through the forward and backward movement of the reed and the up and down movement of the heddle frame, the warp and weft yarns are interwoven to form a grey fabric with a lattice structure (as shown in Figure 3 ). The warp yarn is 20D / 7F nylon DTY, and the weft yarn is 20D / 10F nylon DTY mechanical elastic yarn. The density of the grey fabric is: warp density 180 roots per inch, weft density 165 roots per inch, and the gram weight of the grey fabric is 34 g / m2 The grey fabric is desized at a speed of 20 m / min and a temperature of 95 °C without tension to clean the sizing agent and impurities on the fiber surface, obtaining a pre-treated fabric with weft direction shrinkage. The desizing auxiliaries include: 10 g / L of NaOH, 913 g / L of degreasing agent CL-9, 5 g / L of sodium dodecyl sulfonate, and 1 g / L of sodium carbonate.

[0062] (2) Dissolve dodecyl sulfopropyl betaine in water to form a 3% solution, add acid dyes according to customer needs and mix evenly to obtain a dyeing agent. Put the desized grey fabric into the dyeing agent, keep it warm at 55 °C for 40 min, then heat it up to 75 °C at a rate of 0.5 °C / min, and then heat it up to 105 °C at a rate of 1 °C / min and keep it warm for 30 min, and then cool it down to below 50 °C at a rate of 2 °C / min. Finally, feed it into the stenter at 40 m / min and dry it at 185 °C.

[0063] (3) Pad the fabric with a water-repellent finishing agent under a pressure of 3 kg / cm 2 , pre-dry it without contact, heat-set it at a temperature of 190 °C and a speed of 40 m / min for 1.5 min. The water-repellent finishing agent contains 60 g / L of fluorine-free water-repellent agent, 12 g / L of alkylbenzene sulfonate, 1.5 g / L of AEP penetrant, 3.5 g / L of sodium tartrate, and 1.5 g / L of benzyltrimethylammonium hydroxide.

[0064] (4) Dot-apply hot melt adhesive TL-5404D on the fabric with a dotting amount of 7 g / m 2 , and laminate it with a polyurethane film at 90 °C.

[0065] The polyurethane film is prepared by the following method: Disperse 6 parts by weight of sodium palmitate and 1 part by weight of sodium glycyrrhizinate in 100 parts by weight of water, add 8 parts of aluminum-magnesium hydrotalcite, heat up to 75 °C, adjust the pH to 6, stir and react for 2 h, filter by suction, wash with water, and dry to obtain sodium palmitate / sodium glycyrrhizinate modified hydrotalcite. Then mix 30 parts of UE90AE10FR polyurethane, light calcium carbonate, and sodium palmitate / sodium glycyrrhizinate modified hydrotalcite in a ratio of 90:6:4, add them to 70 parts of N,N-dimethylformamide, stir at 30 °C for 1 h, scrape and bake to form a film with a gram weight of 13.6 g / m 2 .

[0066] (5) Composite warp-knitted nylon mesh fabric: Dot-apply hot melt adhesive TL-5404D on the fabric with a dotting amount of 7 g / m 2 , and laminate it with 20D warp-knitted nylon mesh fabric at 85 °C, with a gram weight of 80 g / m 2 .

[0067] Example 3

[0068] Preparation method of lightweight functional composite fabric, comprising the following steps:

[0069] (1) Weaving nylon yarn into fabric:

[0070] The nylon yarn is warped into a full shaft by a warping machine at a speed of 500 m / min, and then sized on the sizing machine at a speed of 150 m / min. Then, using a water jet loom, at a rotational speed of 500 rpm, through the forward and backward movement of the reed and the up and down movement of the heddle frame, the warp and weft yarns are interwoven to form a grey fabric with a lattice structure. The warp yarn is 20D / 7F nylon DTY, and the weft yarn is 20D / 10F nylon DTY mechanical stretch yarn. The density of the grey fabric is: warp density 180 roots per inch, weft density 165 roots per inch, and the gram weight of the grey fabric is 34 g / m 2 . The grey fabric is desized without tension at a speed of 20 m / min and at 95 °C to clean the sizing agent and impurities on the fiber surface, obtaining a mechanical stretch fabric with weft shrinkage. The desizing auxiliary agent contains: 12 g / L of NaOH, 12 g / L of deoiling agent CL-9, 3 g / L of sodium dodecyl sulfonate, and 1 g / L of sodium carbonate.

[0071] (2) Dissolve tetraethylammonium hydroxide in water to form a 3% solution, add acid dyes according to customer needs and mix evenly to obtain a dyeing agent. Put the desized grey fabric into the dyeing agent, keep it warm at 55 °C for 40 min, then heat it up to 75 °C at a rate of 0.5 °C / min, then heat it up to 105 °C at a rate of 1 °C / min and keep it warm for 30 min, then cool it down to below 50 °C at a rate of 2 °C / min, and finally send it into a stenter at 40 m / min and dry it at 185 °C.

[0072] (3) Pad the fabric with a water repellent finishing agent, with a pressure of 3 kg / cm 2 , pre-dry, heat-set at 190 °C and 40 m / min for 1.5 min. The water repellent finishing agent contains 70 g / L of R-ACE fluorine-free water repellent, 15 g / L of alkyl succinate sulfonate, 2 g / L of OEP-70 penetrant, 5 g / L of sodium tartrate, and 0.5 g / L of benzyltrimethylammonium hydroxide.

[0073] (4) Dot-apply hot melt adhesive TL-5404D on the fabric, with a dotting amount of 7 g / m 2 , and compound it with a polyurethane warp-knitted bottom cloth texture printing film at 90 °C.

[0074] Disperse 7 parts by weight of sodium palmitate and 1 part by weight of carbenoxolone sodium in 100 parts by weight of water, add 8 parts of aluminum-magnesium hydrotalcite, heat up to 80 °C, adjust the pH to 6, stir and react for 2 h, filter by suction, wash with water, and dry to obtain sodium palmitate / carbenoxolone sodium modified hydrotalcite. Then mix 30 parts of UE90AE10FR polyurethane, light calcium carbonate, and sodium palmitate / carbenoxolone sodium modified hydrotalcite in a ratio of 90:7:3, add them to 70 parts of N,N-dimethylformamide, stir at 30 °C for 1 h, scrape and bake to form a film, and the gram weight after single-film operation printing is 14.8 g / m 2 , and the gram weight of the fabric composite printing film is 56 g / m 2 .

[0075] (5) First, use laser plate-making technology to obtain a printing roller with the texture of a simulated knitted warp-knitted base fabric on the surface of a metal roller (the texture is as Figure 4 shown). The laser plate-making technology has good microscopic morphology reproducibility, high-definition patterns, and the width, depth, and distribution of microscopic pits can be precisely controlled. Then, apply the mixed printing material to the surface of the polyurethane film through a gravure roller. The printing material is prepared by dissolving polyurethane hydrophilic moisture-permeable resin, black ink, and fumed silica in methyl ethyl ketone organic solvent in a mass ratio of 100:15:3, and the viscosity of the printing material is 955 CPS.

[0076] Comparative Example 1

[0077] The difference from Example 2 is that the material of the polyurethane film only contains polyurethane.

[0078] Comparative Example 2

[0079] The difference from Example 2 is that sodium palmitate / carbenoxolone sodium modified hydrotalcite is not added to the polyurethane film.

[0080] Comparative Example 3

[0081] The difference from Example 2 is that the sodium palmitate / carbenoxolone sodium modified hydrotalcite in the polyurethane film is replaced by unmodified hydrotalcite, and the dosage is the same as that of the sodium palmitate / carbenoxolone sodium modified hydrotalcite.

[0082] Comparative Example 4

[0083] The difference from Example 2 is that during the modification process of hydrotalcite, an equal amount of sodium palmitate is used to replace carbenoxolone sodium.

[0084] Comparative Example 5

[0085] The difference from Example 2 is that during the modification process of hydrotalcite, an equal amount of carbenoxolone sodium is used to replace sodium palmitate.

[0086] Comparative Example 6

[0087] The difference from Example 2 lies in that sodium oleate-modified hydrotalcite is used instead of sodium palmitate / sodium glycyrrhetate-modified hydrotalcite, that is, during the modification process of hydrotalcite, an equal amount of sodium oleate is used to replace sodium palmitate and sodium glycyrrhetate.

[0088] Comparative Example 7

[0089] The difference from Example 2 lies in that the water-repellent finishing agent does not contain sodium tartrate.

[0090] Comparative Example 8

[0091] The difference from Example 2 lies in that the water-repellent finishing agent does not contain benzyltrimethylammonium hydroxide.

[0092] Comparative Example 9

[0093] The difference from Example 2 lies in that the desizing assistant does not contain sodium carbonate.

[0094] Test Example 1

[0095] Taking the fabrics obtained in Examples 1-3 and Comparative Examples 1-9 as samples, their tear strength (referring to GB / T3917.2-2009), hydrostatic pressure (referring to GB / T4744-2013, 60 cm / min, hydrostatic pressure with a net lining test), abrasion resistance (referring to ISO12947-2016), moisture permeability (referring to GB / T12704.2-2009 evaporation method), and surface moisture resistance (referring to GB / T4745-2012) were tested.

[0096] The measured results are shown in Table 1 below.

[0097] Table 1

[0098]

[0099] The results show that the tear strength of the lightweight functional composite fabric obtained in the examples of the present invention reaches more than 10 N, the hydrostatic pressure reaches ≥10000 mmH2O, the surface moisture resistance reaches above grade 4, the abrasion resistance is ≥30000 revolutions, and the moisture permeability reaches 8000 g / m 2 .d or more. It can be seen that the fabric obtained in the present invention has a high tear strength, excellent waterproof moisture permeability and wear resistance. The composition of the polyurethane film in Comparative Examples 1-6 is different from that in the examples, and the performance of the obtained fabric is lower than that in the examples. It can be seen that the modified hydrotalcite has a significant impact on the tear strength, waterproof moisture permeability and wear resistance of the fabric. The hydrostatic pressure of the fabrics obtained in Comparative Examples 7-9 is lower than that in the examples. It can be seen that the desizing treatment and water-repellent finishing will affect the waterproof performance of the fabric.

[0100] Test Example 2

[0101] Taking the fabrics obtained in Examples 1-3 and Comparative Examples 1-9 as samples, refer to GB / T8629-2017 to test their washing resistance. Continuously wash them 10 times using the 4N program of an A-type washing machine, and use Program A for the drying process to hang dry.

[0102] The results are shown in Table 2 below.

[0103] Table 2

[0104]

[0105] The results show that the fabrics obtained in the examples of the present invention have excellent washing resistance, and can still maintain high tear strength, hydrostatic pressure, abrasion resistance and surface moisture resistance after 10 washes. The tear strength, hydrostatic pressure, abrasion resistance and surface moisture resistance of the fabrics obtained in Comparative Examples 1-9 decreased after washing, indicating that the modified hydrotalcite, desizing treatment and water repellent finishing will affect the washing resistance of the fabrics.

[0106] The above description of the embodiments is for the convenience of those of ordinary skill in the art to understand and use the invention. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative labor. Therefore, the present invention is not limited to the above embodiments, and the improvements and modifications made by those skilled in the art without departing from the scope of the present invention should be within the protection scope of the present invention.

Claims

1. A lightweight functional composite fabric, characterized in that, It includes a nylon fabric, a polyurethane film and a base fabric; wherein, the material of the polyurethane film contains polyurethane, light calcium carbonate and sodium palmitate / carbenoxolone modified hydrotalcite; the warp of the nylon fabric is 12 - 20D nylon DTY with a yarn count F number of 6F; the weft is 12 - 20D nylon mechanical stretch DTY with a yarn count F number of 10F. The sodium palmitate / carbenoxolone modified hydrotalcite is prepared by the following method: disperse sodium palmitate and carbenoxolone in water, add hydrotalcite, adjust the pH to 5.5 - 6, stir and react, filter by suction, wash with water, and dry to obtain sodium palmitate / carbenoxolone modified hydrotalcite; the mass ratio of sodium palmitate to carbenoxolone is 5 - 7:1; the total mass ratio of sodium palmitate and carbenoxolone to hydrotalcite is 8 - 10:10; the polyurethane film contains, by mass percentage: 84 - 92% of polyurethane, 4 - 10% of light calcium carbonate, and 2 - 6% of sodium palmitate / carbenoxolone modified hydrotalcite.

2. The lightweight functional composite fabric according to claim 1, wherein The fabric density is: warp density 180 - 240 threads per inch, weft density 160 - 190 threads per inch.

3. The lightweight functional composite fabric according to any one of claims 1-2, characterized in that, The polyurethane film is prepared by the following method: mix polyurethane, light calcium carbonate, and sodium palmitate / carbenoxolone modified hydrotalcite, add them to an organic solvent, stir at 20 - 35°C for 0.5 - 1 h, scrape and coat on a release paper to form a film, and then wind it up for standby.

4. The preparation method of the lightweight functional composite fabric according to any one of claims 1-2, characterized in that, It includes the following steps: (1) Weave the warp nylon DTY and the weft nylon mechanical stretch DTY into a fabric; (2) Dye the fabric with acid dyes; (3) Carry out water - repellent finishing on the fabric with a water - repellent finishing agent; (4) Composite the PUR moisture - curing hot - melt adhesive with the polyurethane film; (5) Composite the PUR moisture - curing hot - melt adhesive with a warp - knitted nylon mesh fabric or imitate the texture of knitted warp - knitted printing.

5. The preparation method according to claim 4, characterized in that, During the process of weaving the nylon yarn into a fabric, it includes tension - free desizing. The desizing aids used in the desizing process include: 8 - 12 g / L of NaOH, 2 - 4 g / L of degreasing agent, 3 - 6 g / L of scouring agent, and 0.5 - 1 g / L of carbonate.

6. The preparation method according to claim 4, characterized in that, The water - repellent finishing agent contains: 50 - 70 g / L of fluorine - free waterproof agent, 8 - 15 g / L of cross - linker, 0.5 - 2 g / L of penetrant, 2 - 5 g / L of sodium tartrate, and 0.5 - 2 g / L of benzyltrimethylammonium hydroxide.

7. The preparation method according to claim 4, characterized in that, The steps for the composite polyurethane film are as follows: Dot-apply PUR moisture-curing hot melt adhesive on the fabric, with the amount of adhesive applied being 6 - 7 g / m 2 , and laminate it with the polyurethane film at 80 - 90 °C.

Images