Water-repellent anti-ultraviolet fabric and preparation method thereof

Abstract

The invention relates to the technical field of textile fabrics, in particular to a water-repellent anti-ultraviolet fabric and a preparation method thereof.The fabric is of a double-layer structure with a protective surface layer and a comfortable inner layer, the surface layer is formed by weaving chinlon 66 / polyester DTY yarn subjected to water-repellent treatment into plain weave, and the inner layer is formed by weaving spandex-chinlon low stretch yarn covering yarn into weft plain stitch; the two layers are connected through a'one-to-one 'tuck stitch, a single'yarn water-repellent treatment' scheme is adopted in the preparation method, the preparation method comprises the four steps of yarn pretreatment (water-repellent finishing liquid dipping-drying-baking), fabric weaving, dyeing and anti-ultraviolet finishing and shaping, and by optimizing key parameters such as the water-repellent finishing liquid concentration and the anti-ultraviolet absorbent adding amount, the anti-ultraviolet fabric can be obtained. After a finished product is washed with water for 20 times, the water repellent grade still reaches GB / T4745-2012 standard grade 4 or above, the uvioresistant UPF value is larger than or equal to 40, the moisture permeability is larger than or equal to 8000g / (m < 2 > 24h), and the fabric is suitable for thin outdoor jackets, jackets and other clothes and gives consideration to functional durability and wearing comfort.

Description

Technical Field

[0001] This invention relates to the field of textile fabric technology, and in particular to a water-repellent and UV-resistant fabric and its preparation method. Background Technology

[0002] With the rapid development of the outdoor sports industry, consumers' functional demands for outdoor clothing have evolved from simply providing warmth to a combination of "water-repellent + UV protection + high comfort." Currently, most water-repellent and UV-protective fabrics on the market suffer from the following technical deficiencies, making it difficult to meet users' core needs: Poor functional durability: Most existing fabrics use a "single coating" process, which means that water-repellent or UV-resistant coatings are directly applied to the surface of the woven fabric. Due to the weak bonding between the coating and the fiber (mainly relying on physical adsorption), the water-repellent coating is easy to fall off after 5-10 washes, and the grade drops from level 4 in the GB / T4745-2012 standard to below level 2; the UV-resistant coating is washed away, and the UPF value drops sharply from 50+ to below 15, making it unable to cope with complex outdoor environments for a long time.

[0003] Insufficient fabric comfort: In order to improve the water-repellent effect, some manufacturers use high-thickness fluorocarbon coating (coating thickness ≥15μm) or ultra-dense weaving structure (warp density >160 yarns / inch), which seriously reduces the breathability of the fabric. The moisture permeability is generally less than 5000g / (㎡・24h), which can easily cause a stuffy feeling during outdoor sports. At the same time, after the coating is cured, it will make the fabric feel stiff, with a bending stiffness greater than 30mN・m and a coefficient of friction with the skin >0.3, resulting in poor wearing comfort.

[0004] Poor functional synergy: Water-repellent finishing agents and UV-resistant finishing agents have a natural compatibility conflict—fluorine-free water-repellent finishing agents will form a dense hydrophobic film on the fabric surface, which will prevent the UV absorber from penetrating into the fiber, resulting in local UPF value differences of more than 10 (such as UPF value of 35 at the edge of the fabric and UPF value of 48 at the center), and uneven UV resistance. Conversely, the polar hydroxyl groups of UV absorbers reduce the surface tension of the water-repellent coating, causing the water contact angle to drop from over 150° to below 120°, resulting in a significant reduction in the water-repellent effect.

[0005] The manufacturing process is complex: some high-end fabrics use a "multi-step coating + multiple baking" process, such as first coating with an anti-UV coating and baking at 120℃ for 3 minutes, then coating with a water-repellent coating and baking at 150℃ for 2 minutes. This not only adds 3-4 processes and extends the production cycle by more than 50%, but also causes damage to the fabric strength, with a warp breaking strength loss rate of more than 15% and a weft breaking strength loss rate of more than 12%, affecting the service life of the fabric.

[0006] To address the aforementioned issues, there is an urgent need in this field to develop a water-repellent and UV-resistant fabric and its preparation method that achieves synergistic optimization of "structure-function-process". This method would utilize a single, efficient process route to ensure both functional durability and comfort, as well as production efficiency, thereby filling a gap in existing technologies. Summary of the Invention

[0007] To overcome the technical defects of the existing technology, the present invention provides a water-repellent and UV-resistant fabric and its preparation method. By designing a "double-layer functional partition fabric structure" and a "single process for water-repellent yarn treatment", the long-term synergistic effect of water repellency and UV resistance is achieved.

[0008] The technical solution adopted in this invention is: a water-repellent and UV-resistant fabric, characterized in that: it includes a double-layer structure consisting of an outer layer and an inner layer, wherein the outer layer is woven from warp and weft yarns, and both the warp and weft yarns are nylon 66 yarn or polyester DTY yarn treated with water repellency, with a yarn linear density of 40S-60S, a warp yarn density of 120-150 yarns / inch, and a weft yarn density of 90-110 yarns / inch; The inner layer is a core-spun yarn of spandex and nylon low-elasticity yarn, with spandex yarn having a mass fraction of 5%-8% and nylon low-elasticity yarn having a linear density of 30D-50D; The outer and inner layers are connected by a "1-separated-1" coil structure, with the coil length of the coil structure being 2.5mm-3.0mm.

[0009] Includes the following steps: Step 1: Yarn Pretreatment Preparation of water-repellent finishing solution: Mix fluorine-free waterproof finishing agent, penetrant, and crosslinking agent in a mass ratio of 100:5:8, and dilute with deionized water to a mass concentration of 15%-20%; Yarn impregnation: Place nylon 66 yarn or polyester DTY yarn into a water-repellent finishing solution and impregnate for 30-40 minutes at 40℃-50℃ and a liquor ratio of 1:10, stirring at a rate of 60r / min during impregnation. Drying and baking: Dry with hot air at 80℃-90℃ for 30 minutes, followed by baking at 150℃-160℃ for 2-3 minutes, with a baking tension of 5N-8N; Step 2: Fabric Weaving Weaving: 18-22 needles / inch double-sided knitting machine, 20r / min-25r / min speed, surface layer (101) plain weave, inner layer weft plain weave, tuck weave connection, workshop temperature 22℃-25℃, relative humidity 60%-65%; Greige fabric inspection: The greige fabric is free of broken yarns, missed needles, and stains. The warp density deviation is ≤ ±2 yarns / inch, the weft density deviation is ≤ ±1 yarn / inch, and the width deviation is ≤ ±1cm. Step 3: Dyeing and UV Protection Finishing Dye liquor preparation: Select disperse dyes (for polyester) or acid dyes (for nylon), add UV absorber, leveling agent, and pH adjuster. The UV absorber is 8%-12% of the dye mass, the leveling agent is 0.5%-1% of the dye liquor mass, and the pH is adjusted to 4.5-5.5. Stir at 40℃-50℃ and 80r / min. Dyeing: The greige fabric is put into the dyeing machine. At room temperature and liquor ratio of 1:5-8, it is kept at the temperature for 10 minutes, then heated at 2℃ / min to 80℃-90℃ and kept at the temperature for 20 minutes, then heated at 1℃ / min to 110℃-120℃ (polyester) or 95℃-100℃ (nylon) and kept at the temperature for 40-50 minutes, then cooled at 3℃ / min to 60℃ and drained. UV-resistant fixation: Add deionized water and heat to 70℃-80℃, add isocyanate crosslinking agent (50%-60% of the mass of UV absorber), keep warm for 30 minutes, and wash twice with 60℃ warm water for 10 minutes each time; Step 4: Shaping Setting process: Setting at 160℃-170℃ and 15m / min-20m / min speed, with a fabric width of 1.05-1.1 times that of the greige fabric, and adding polyamide epichlorohydrin resin anti-wrinkle agent (2%-3% of the fabric weight). Cooling and testing: Cool at 25℃-30℃ for 5-10 minutes, and test water repellency rating, UPF value and other indicators.

[0010] Preferably, the waterproofing agent in step 1 is fluorine-free; the penetrant is fatty alcohol polyoxyethylene ether. The crosslinking agent is hexamethoxymethyl melamine.

[0011] Preferably, the UV absorber in step 3 is 2-hydroxy-4-methoxybenzophenone, with a purity ≥99%, a lightfastness rating ≥7, and a UPF value decrease of ≤5% after 100 hours of exposure.

[0012] Preferably, the double-sided knitting machine used in step 2 has a needle pitch adjustment accuracy of 0.1 needles / inch to ensure that the uniformity deviation of the weaving density is ≤ ±1 needle / inch.

[0013] Preferably, in step 3, a high-temperature and high-pressure jet dyeing machine is used for dyeing, with a dye liquor circulation rate of ≥50L / min. During the dyeing process, the dynamic tension of the fabric is controlled at 8cN-12cN to avoid fabric stretching and deformation, and the color difference value ΔE after dyeing is ≤1.5.

[0014] Preferably, in step 1, the moisture content of the yarn after impregnation is controlled to be 4%-6%, the degree of crosslinking of the water-repellent finishing agent on the yarn surface after baking is ≥90%, and the yarn bending stiffness is ≤30mN・m, to ensure the flexibility of the yarn during subsequent weaving.

[0015] Preferably, in step 4, the washed shrinkage rate of the fabric after shaping is ≤2%, the wrinkle recovery angle is ≥180°, the warp breaking strength loss rate is ≤8%, and the weft breaking strength loss rate is ≤6%, which meets the strength and dimensional stability requirements of outdoor clothing.

[0016] The beneficial effects of this invention are: 1. Significantly improved functionality and durability: By adopting the "yarn pretreatment + cross-linking fixation" process, the cross-linking degree between the water-repellent finishing agent and the fiber is ≥90%, and the UV absorber is bonded to the fiber through the cross-linking agent (bonding force ≥3N / 2.5cm). After 20 washes, the water repellency level still maintains level 4 or above of the GB / T4745-2012 standard, and the UV protection UPF value is ≥40, which is 2-3 times that of existing coated fabrics, meeting the "long-term use" requirements of outdoor clothing.

[0017] Comfort is comprehensively optimized: The double-layer structure and weft plain knit weave work together to achieve a moisture permeability of ≥8000g / (㎡・24h), which is more than 60% higher than traditional coated fabrics, solving the problem of stuffiness. The inner core-spun yarn has high softness (bending stiffness ≤28mN・m), a coefficient of friction with the skin of ≤0.2, and a softness rating of 4-5 (5 being the best). The wearing comfort is comparable to ordinary casual fabrics. At the same time, the stretch recovery rate is ≥85%, which can adapt to the movement of the body during outdoor sports without feeling tight.

[0018] 3. Functional Synergy and No Conflict: Optimized functional assignment sequence—the yarn pretreatment completes the water-repellent function, and the subsequent dyeing process adds an anti-UV absorber and cross-links it for fixation. The two act separately on the inside of the yarn and the surface of the fiber, without contact or conflict. The water-repellent rating and UPF value are independent of each other, simultaneously achieving level 5 and 50+, avoiding the problem of existing technologies "sacrificing one for the other".

[0019] 4. Simple and efficient process: The single solution of "yarn water-repellent treatment" reduces the number of processes by 3-4 compared to the existing "multi-step coating" process, shortening the production cycle by more than 50%; no special coating equipment is required, only conventional knitting, dyeing and setting equipment is needed, resulting in low modification costs (modification cost of a single production line < 500,000 yuan); energy consumption is reduced by 20% (energy consumption per unit product < 50 kWh / 100m), and the cost per unit product is reduced by 12%, making it suitable for large-scale industrial promotion.

[0020] 5. This fabric has a wide range of applications: it is lightweight (120-180g / ㎡) and has high strength (warp breaking strength ≥300N). In addition to thin outdoor jackets and coats, it can also be used for outdoor sun protection shawls (UPF value ≥50), lightweight tents (water repellency level ≥5), etc., and has broad market application prospects. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the process of the present invention.

[0022] Figure 2 This is a schematic diagram of the structure of each layer of the fabric of the present invention.

[0023] Explanation of reference numerals in the attached diagram: 1. Outer layer; 101. Warp yarn; 102. Weft yarn; 2. Inner layer. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings: This embodiment provides a water-repellent and UV-resistant fabric and its preparation method, including a double-layer structure consisting of an outer layer 1 and an inner layer 2. The outer layer 1 is woven from warp yarns 101 and weft yarns 102, and both warp yarns 101 and weft yarns 102 are nylon 66 yarns or polyester DTY yarns treated with water repellency. The yarn linear density is 75D-100D, the warp yarn density is 120-150 turns / inch, and the weft density is 90-110 turns / inch. The inner layer 2 is a core-spun yarn of spandex and nylon low-elasticity yarn, with spandex yarn mass fraction of 5%-8% and nylon low-elasticity yarn linear density of 30D-50D; The outer layer 1 and the inner layer 2 are connected by a "1-separated-1" coil structure, with the coil length of the coil structure being 2.5mm-3.0mm; It should be noted that the raw material selection for surface layer 1 is: nylon 66 yarn or polyester DTY yarn treated with water repellency.

[0025] Both yarns possess excellent weather resistance (UV aging resistance level ≥4) and mechanical strength (breaking strength ≥4.5cN / dtex). After water-repellent treatment, they can form an initial protective barrier in advance, reducing subsequent fabric finishing processes. Yarn linear density 40D-60D—if the linear density is too low (<40D), the yarn is too fine, and the fabric is prone to snagging after weaving; if it is too high (>60D), the yarn is too coarse, and the fabric is heavy, which does not meet the needs of thin outdoor clothing.

[0026] Density and Weave: Warp 101 has a density of 120-150 ends / inch, and weft 102 has a density of 90-110 ends / inch. It is woven with a plain weave, which has many interlacing points (≥100 interlacing points per square centimeter), forming a dense surface structure, reducing the path of water penetration (water penetration time ≥300s / ㎡), and providing a stable carrier for subsequent UV absorbers (absorber adhesion amount ≥2% of fabric weight), avoiding loss during washing; Inner layer 2 (protective layer) material selection: core-spun yarn of spandex and nylon low elasticity yarn, with spandex yarn mass fraction of 5%-8% - if the content is too low (<5%), the fabric will not be elastic enough, the stretch recovery rate will be less than 80%, and it will not be able to adapt to limb movement; if the content is too high (>8%), the fabric will be easy to deform, tight to wear, and the size change rate after washing will be >3%.

[0027] The nylon low-elasticity yarn has a linear density of 30D-50D, high fiber softness (bending stiffness ≤10mN・m), and a coefficient of friction with the skin ≤0.2, significantly improving wearing comfort.

[0028] Fabric design: It adopts a weft plain knit structure, which has the characteristics of "loop fluffiness" and can form tiny air cavities between fibers (air cavity volume ratio ≥20%). The moisture permeability is ≥8000g / (㎡・24h), which is more than 1.5 times that of traditional coated fabrics. At the same time, the tensile recovery rate is ≥85%, and it still retains ≥80% after 50 washes, which can adapt to the large range of limb movements during outdoor sports.

[0029] The outer layer 1 and the inner layer 2 are connected by a "1-separated-1" tucked structure with a coil length of 2.5mm-3.0mm. This tucked structure differs from traditional suturing (which is prone to hardening and has a friction coefficient >0.4). It can form a continuous air channel (channel diameter 5-10μm) between the two layers, further improving breathability (moisture permeability can be increased by an additional 5%-8%). At the same time, it ensures structural stability. After 50 washes, the peel strength between the two layers is still ≥5N / 2.5cm, with no risk of delamination.

[0030] Includes the following steps: Step 1: Yarn pretreatment:

[0031] Preparation of water-repellent finishing solution: Mix fluorine-free waterproof finishing agent, penetrant, and crosslinking agent in a mass ratio of 100:5:8, and dilute with deionized water to a mass concentration of 15%-20%; Yarn impregnation: Place nylon 66 yarn or polyester DTY yarn into a water-repellent finishing solution and impregnate for 30-40 minutes at 40℃-50℃ and a liquor ratio of 1:10, stirring at a rate of 60r / min during impregnation. Drying and baking: Dry with hot air at 80℃-90℃ for 30 minutes, followed by baking at 150℃-160℃ for 2-3 minutes, with a baking tension of 5N-8N. Note that... Water-repellent finishing solution formulation: The fluorine-free water-repellent finishing agent provides hydrophobic groups, making the contact angle of the yarn surface ≥150°; the penetrant (fatty alcohol polyoxyethylene ether) reduces the surface tension of the finishing solution (≤30mN / m), promoting its penetration into the yarn interior (penetration depth ≥80% of the yarn radius), avoiding functional loss caused by only surface adhesion; The cross-linking agent (hexamethoxymethyl melamine) can react with the hydroxyl groups of the fiber and the active groups of the finishing agent to form a three-dimensional cross-linking network, which enhances the bonding force. After 20 washes, the water repellency level is still ≥4. The mass concentration of the finishing solution is 15%-20%. If the concentration is too low (<15%), the amount of finishing agent adhering is insufficient (<1.5% of the yarn mass), and the contact angle is less than 130°. If the concentration is too high (>20%), the yarn will be stiff (bending stiffness >40mN·m), and it will be easy to break the yarn during weaving.

[0032] Yarn impregnation: Impregnation temperature 40℃-50℃—If the temperature is too low (<40℃), the penetration speed of the finishing solution will be slow (<0.5mm / min), and the impregnation time needs to be extended to more than 60min; if the temperature is too high (>50℃), the finishing agent will easily evaporate (evaporation rate >5%), resulting in unstable concentration. Liquor ratio 1:10—If the liquor ratio is too small (<1:10), the yarn cannot be fully impregnated, resulting in uneven finishing; if it is too large (>1:10), the finishing solution will be wasted, and the cost will increase.

[0033] A stirring rate of 60 r / min can prevent yarn tangling (tangling rate <0.1% / 100m) and ensure that each yarn is evenly contacted with the finishing solution.

[0034] Drying and baking: Drying temperature of 80℃-90℃ can quickly remove surface moisture (moisture content ≤5%), avoiding moisture residue that may cause the finishing agent to migrate during subsequent baking; baking temperature of 150℃-160℃—if the temperature is too low (<150℃), the crosslinking agent will not react completely (crosslinking degree <80%), and the finishing agent will easily fall off; if the temperature is too high (>160℃), the yarn strength loss rate will exceed 10%, affecting the fabric strength; tension control of 5N-8N can prevent yarn stretching deformation (elongation ≤2%), ensuring the yarn length is stable during subsequent weaving. Step 2: Fabric weaving:

[0035] Weaving: 18-22 needles / inch double-sided knitting machine, 20r / min-25r / min knitting speed, surface layer 1 plain weave, inner layer 2 weft plain weave, tuck stitch connection, workshop temperature 22℃-25℃, relative humidity 60%-65%; Greige fabric inspection: The greige fabric is free of broken yarns, missed needles, and stains. The density deviation of warp yarn 101 is ≤ ±2 yarns / inch, the density deviation of weft yarn 102 is ≤ ±1 yarn / inch, and the width deviation is ≤ ±1cm. It should be noted that the warping speed is 400m / min-500m / min. If the speed is too low (<400m / min), the production efficiency will be low (daily output <500m); if it is too high (>500m / min), the yarn tension will fluctuate greatly (tension deviation > ±2cN) and the yarn will be prone to breakage (breakage rate >0.5% / 1000m).

[0036] A warping tension of 12cN-15cN ensures that the warp yarns 101 are evenly arranged (warp yarn spacing deviation ≤ ±0.1mm), avoiding uneven density in the fabric after weaving.

[0037] Weaving: 18-22 needles / inch knitting machine needle pitch - If the needle pitch is too small (<18 needles / inch), the fabric is too dense and the moisture permeability is reduced (<7000g / (㎡・24h)); if it is too large (>22 needles / inch), the fabric structure is loose and the water-repellent effect is poor (moisture penetration time <180s / ㎡).

[0038] A weaving speed of 20-25 r / min balances production efficiency and quality. Too high a speed (>25 r / min) leads to rapid wear of the knitting machine needle bar and a fabric skipped needle rate >1%; too low a speed (<20 r / min) results in a daily output <300m. Workshop temperature and humidity control is crucial—too high a temperature (>25℃) causes yarn brittleness (breaking strength decreases by >5%); too low a temperature (<22℃) causes yarn stiffness and increased yarn breakage rate; too low a relative humidity (<60%) results in high yarn static electricity (static voltage >1000V), making it prone to tangling; too high a relative humidity (>65%) causes yarn to absorb moisture (moisture content >8%), making the woven fabric prone to wrinkling.

[0039] Fabric inspection: Visual inspection is conducted by a combination of manual visual inspection and light inspection (illuminance ≥800 lux) to ensure that there are no visible defects such as broken yarns, missed needles, and stains; parameter inspection is conducted using a fabric density meter (accuracy ±1 thread / inch) and a width measuring instrument (accuracy ±0.1 cm) to ensure that the density and width deviations are within the allowable range, and to avoid "local functional inconsistencies" during subsequent dyeing and finishing (such as high UPF values ​​in areas with excessively high density, and low water repellency ratings in areas with excessively low density). Step 3: Dyeing and UV Protection Finishing:

[0040] Dye liquor preparation: Select disperse dyes (for polyester) or acid dyes (for nylon), add UV absorber, leveling agent, and pH adjuster. The UV absorber is 8%-12% of the dye mass, the leveling agent is 0.5%-1% of the dye liquor mass, and the pH is adjusted to 4.5-5.5. Stir at 40℃-50℃ and 80r / min. Dyeing: The greige fabric is put into the dyeing machine. At room temperature and liquor ratio of 1:5-8, it is kept at the temperature for 10 minutes, then heated at 2℃ / min to 80℃-90℃ and kept at the temperature for 20 minutes, then heated at 1℃ / min to 110℃-120℃ (polyester) or 95℃-100℃ (nylon) and kept at the temperature for 40-50 minutes, then cooled at 3℃ / min to 60℃ and drained. UV-resistant fixation: Add deionized water and heat to 70℃-80℃, add isocyanate crosslinking agent (50%-60% of the mass of UV absorber), keep warm for 30 minutes, and wash twice with 60℃ warm water for 10 minutes each time; Step 4: Shaping:

[0041] Setting process: Setting at 160℃-170℃ and 15m / min-20m / min speed, with a fabric width of 1.05-1.1 times that of the greige fabric, and adding polyamide epichlorohydrin resin anti-wrinkle agent (2%-3% of the fabric weight). Cooling and Inspection: Cool at 25℃-30℃ for 5-10 minutes, and test water repellency rating, UPF value and other indicators. Note: Setting process: Setting temperature of 160℃-170℃ - if the temperature is too low (<160℃), the fabric dimensional stability will be poor (washing shrinkage >3%), and the water repellency finishing agent will not be fully cured (contact angle <140°). Excessive temperature (>170℃) will cause fiber embrittlement (breaking strength decreases by >10%), decomposition of UV absorbers (decomposition rate >5%), and a decrease in UPF value. A setting speed of 15m / min-20m / min is recommended—too low a speed (<15m / min) results in low production efficiency and localized overheating of the fabric (temperature deviation >±5℃); too high a speed (>20m / min) leads to insufficient setting and poor dimensional stability. The setting width should be 1.05-1.1 times the width of the greige fabric to eliminate internal stress during weaving (internal stress reduced to <2MPa) and prevent fabric shrinkage after washing.

[0042] Anti-wrinkle agent (polyamide epichlorohydrin resin) dosage 2%-3% Fabric quality — If the dosage is too low (<2%), the wrinkle recovery angle will be <180°, and the fabric will wrinkle easily; if it is too high (>3%), the fabric will turn yellow (yellowing index>3), affecting the appearance.

[0043] Cooling and Inspection: Cooling temperature of 25℃-30℃ can quickly stabilize the fabric structure (crystallization deviation <2%) and avoid residual heat causing dimensional changes (dimensional change rate <0.5%).

[0044] Performance testing is strictly conducted in accordance with national standards: water repellency rating is tested according to GB / T4745-2012 "Test and Evaluation of Waterproof Performance of Textiles", requiring an initial rating ≥5 and a rating ≥4 after 20 washes; UV protection UPF value is tested according to GB / T18830-2009 "Evaluation of UV Protection Performance of Textiles", requiring an initial UPF value ≥50 and a value ≥40 after 20 washes; moisture permeability is tested according to GB / T12704.1-2009 "Textiles - Test Method for Moisture Permeability of Fabrics - Part 1: Moisture Absorption Method", requiring a value ≥8000g / (㎡・24h); tensile recovery rate is tested according to GB / T3923.1-2013 "Textiles - Tensile Properties of Fabrics - Part 1: Determination of Breaking Strength and Elongation at Break (Strip Method)", requiring a value ≥85%.

[0045] The following four examples illustrate the specific implementation process of the present invention. All examples aim to produce 100m of thin outdoor jacket fabric (1.5m wide) and verify the performance effect under different raw materials and parameters.

[0046] Example 1: Nylon 66 fabric (yarn water-repellent treatment) Raw material preparation: outer layer 100D nylon 66 yarn (breaking strength 5.2cN / dtex, UV aging resistance level 4), inner layer 15D spandex yarn + 40D nylon low elasticity yarn core-spun yarn (spandex content 6%, tensile recovery rate 88%).

[0047] Yarn pretreatment: Prepare a fluorine-free waterproofing finishing agent; Impregnation: 45℃, liquor ratio 1:10, impregnation for 35 minutes, stirring at 60 r / min; Drying and baking: Dry at 85℃ for 30 minutes (moisture content 4.5%), bake at 155℃ for 2.5 minutes, tension 6N (yarn elongation 1.8%).

[0048] Fabric weaving: Warping speed: 450m / min, tension 13cN, warp yarn spacing deviation 0.08mm. Weaving: German Santoni SM8-TOP2 20-gauge / inch double-sided knitting machine, speed 22 r / min, outer layer 1 warp yarn 101 density 130 ends / inch, weft yarn 102 density 100 ends / inch, inner layer 2 weft plain knit, tuck stitch loop length 2.8mm, workshop temperature 24℃, relative humidity 62%; Greige fabric inspection: No broken yarns or missing needles; warp yarn density deviation 101 +1 yarns / inch; weft yarn density deviation 102 0 yarns / inch; width deviation +0.5cm.

[0049] Dyeing and UV-resistant finishing: Dyeing solution: Acid dye (color: navy blue), 2-hydroxy-4-methoxybenzophenone (purity 99.5%) added at 10% of dye weight, sodium dodecylbenzenesulfonate at 0.8% of dyeing solution weight, acetic acid to adjust pH to 5.0, stirred at 45℃ and 80r / min; Dyeing: Lixin TX210 high temperature and high pressure jet dyeing machine, dye liquor circulation rate 55L / min, fabric dynamic tension 10cN, room temperature dyeing (10min) → heating up to 85℃ at 2℃ / min (20min) → heating up to 98℃ at 1℃ / min (45min) → cooling down to 60℃ at 3℃ / min and draining, color difference value ΔE=1.2; Fixation: Add isocyanate crosslinking agent (55% of absorbent mass) at 75℃, keep warm for 30 min, and wash twice with water at 60℃ (10 min each time, residual amount 0.4%).

[0050] Setting: 165℃, 18m / min speed, 1.6m width (grey fabric width 1.5m, magnification 1.07 times), 2.5% polyamide epichlorohydrin resin anti-wrinkle agent, 28℃ cooling for 8min.

[0051] Performance test results: Water repellency rating: Level 5 according to GB / T4745-2012 standard, Level 4 after 20 washes; UV protection UPF value: 55 (GB / T18830-2009 standard), 42 after 20 washes; Moisture permeability: 8500g / (㎡・24h) (GB / T12704.1-2009 standard); Tensile recovery rate: 88% (GB / T3923.1-2013 standard); Bending stiffness: 25 mN·m, flexibility rating: 4; Color fastness: Color fastness to rubbing is grade 4, color fastness to washing is grade 4 (GB / T3920-2008, GB / T3921-2008 standards). Washing shrinkage: 1.5%, wrinkle recovery angle: 185°, warp breaking strength loss rate: 6%, weft breaking strength loss rate: 5%.

[0052] Example 2: Polyester fabric (yarn water-repellent treatment) Raw material preparation: outer layer 120D polyester DTY yarn (breaking strength 4.8cN / dtex, UV aging resistance level 4), inner layer 20D spandex yarn + 50D nylon low elastic yarn core-spun yarn (spandex content 7%, tensile recovery rate 86%).

[0053] Yarn pretreatment: Prepare a fluorine-free waterproofing finishing agent; Impregnation: 48℃, liquor ratio 1:10, impregnation for 32 minutes, stirring at 60 r / min; Drying and baking: Dry at 88℃ for 28 minutes (moisture content 4.2%), bake at 158℃ for 2.2 minutes, tension 7N (yarn elongation 1.9%).

[0054] Fabric weaving: Warping: speed 480m / min, tension 14cN (warp yarn spacing deviation 0.09mm). Weaving: German Santoni SM8-TOP2 22-gauge / inch double-sided knitting machine, speed 24 r / min, outer layer 1 warp yarn 101 density 140 ends / inch, weft yarn 102 density 105 ends / inch, inner layer 2 weft plain knit, tuck stitch loop length 2.6mm, workshop temperature 25℃, relative humidity 64%; Greige fabric inspection: No broken yarns or missing needles; warp yarn density deviation 101 +1 thread / inch; weft yarn density deviation 102 +1 thread / inch; width deviation +0.8cm.

[0055] Dyeing and UV-resistant finishing: Dyeing solution: Disperse dye (color: gray), 2-hydroxy-4-methoxybenzophenone (purity 99.2%) added at 11% dye mass, sodium dodecylbenzenesulfonate at 0.9% dyeing solution mass, acetic acid adjusted to pH 4.8, stirred at 48℃ and 80r / min; Dyeing: Lixin TX210 high temperature and high pressure jet dyeing machine, dye liquor circulation rate 60L / min, fabric dynamic tension 11cN, room temperature dyeing (10min) → heating up to 88℃ at 2℃ / min (20min) → heating up to 115℃ at 1℃ / min (40min) → cooling down to 60℃ at 3℃ / min and draining, color difference value ΔE=1.0; Fixation: Add isocyanate crosslinking agent (58% of absorbent mass) at 78℃, keep warm for 28 min, and wash twice with water at 60℃ (residual amount 0.3%).

[0056] Setting: 168℃, 16m / min speed, 1.65m width (1.1x magnification), 2.8% anti-wrinkle agent, 29℃ cooling for 7min.

[0057] Performance test results: Water repellency rating: Level 5, Level 4 after 20 washes; UV protection UPF value: 58, 45 after 20 washes; Moisture permeability: 8200g / (㎡・24h); Tensile recovery rate: 86%; Bending stiffness: 28 mN·m, flexibility rating: 4; Color fastness: Color fastness to rubbing is grade 4, color fastness to washing is grade 4-5; Washing shrinkage: 1.2%, wrinkle recovery angle: 190°, warp breaking strength loss rate: 7%, weft breaking strength loss rate: 6%.

[0058] Example 3: High-elastic nylon 66 fabric (yarn water-repellent treatment) Raw material preparation: outer layer 150D nylon 66 yarn (breaking strength 5.0cN / dtex), inner layer 20D spandex yarn + 45D nylon low elasticity yarn core-spun yarn (spandex content 8%, tensile recovery rate 90%).

[0059] Yarn pretreatment: Prepare a fluorine-free waterproofing finishing agent; Impregnation: 42℃, liquor ratio 1:10, impregnation for 38 minutes, stirring at 60 r / min; Drying and baking: Dry at 82℃ for 30 minutes (moisture content 4.8%), bake at 152℃ for 2.8 minutes, tension 5N (yarn elongation 1.5%).

[0060] Fabric weaving: Warping: speed 420m / min, tension 12cN (warp yarn spacing deviation 0.07mm). Weaving: German Santoni SM8-TOP2 19-gauge / inch double-sided knitting machine, speed 21 r / min, outer layer 1 warp yarn 101 density 125 ends / inch, weft yarn 102 density 95 ends / inch, inner layer 2 weft plain knit, tuck stitch loop length 2.9mm, workshop temperature 23℃, relative humidity 61%; Greige fabric inspection: No broken yarns or missing needles; warp yarn 101 density deviation 0 yarns / inch; weft yarn 102 density deviation -1 yarn / inch; width deviation +0.3cm.

[0061] Dyeing and UV-resistant finishing: Dyeing solution: Acid dye (color: blue), 2-hydroxy-4-methoxybenzophenone (purity 99.3%) added at 9% dye mass, sodium dodecylbenzenesulfonate at 0.6% dyeing solution mass, acetic acid to adjust pH to 5.2, stirred at 42℃ and 80r / min; Dyeing: Lixin TX210 high temperature and high pressure jet dyeing machine, dye liquor circulation rate 52L / min, fabric dynamic tension 8cN, room temperature dyeing (10min) → heating up to 82℃ at 2℃ / min (20min) → heating up to 95℃ at 1℃ / min (48min) → cooling down to 60℃ at 3℃ / min and draining, color difference value ΔE=1.3; Fixation: Add isocyanate crosslinking agent (52% of absorbent mass) at 72℃, keep warm for 32 min, and wash twice with water at 60℃ (residual amount 0.5%).

[0062] Setting: 162℃, 19m / min speed, 1.58m width (1.05x magnification), 2.2% anti-wrinkle agent, 26℃ cooling for 9min.

[0063] Performance test results: Water repellency rating: Level 5, Level 4 after 20 washes; UV protection UPF value: 52, 40 after 20 washes; Moisture permeability: 8800g / (㎡・24h); Tensile recovery rate: 90%; Bending stiffness: 23 mN·m, flexibility rating: 4-5; Color fastness: Color fastness to rubbing is grade 4, color fastness to washing is grade 4; Washing shrinkage: 1.8%, wrinkle recovery angle: 182°, warp breaking strength loss rate: 5%, weft breaking strength loss rate: 4%.

[0064] Example 4: Lightweight polyester fabric (yarn water-repellent treatment) Raw material preparation: outer layer 120D polyester DTY yarn (breaking strength 4.6cN / dtex), inner layer 245D spandex yarn + 55D nylon low elastic yarn core-spun yarn (spandex content 5%, tensile recovery rate 87%).

[0065] Yarn pretreatment: Prepare a fluorine-free waterproofing finishing agent; Impregnation: 46℃, liquor ratio 1:10, impregnation for 34 min, stirring at 60 r / min; Drying and baking: Dry at 86℃ for 29 minutes (moisture content 4.3%), bake at 156℃ for 2.4 minutes, tension 8N (yarn elongation 2.0%).

[0066] Fabric weaving: Warping: speed 460m / min, tension 15cN (warp yarn spacing deviation 0.1mm); Weaving: German Santoni SM8-TOP2 21-gauge / inch double-sided knitting machine, speed 23 r / min, outer layer 1 warp yarn 101 density 145 ends / inch, weft yarn 102 density 108 ends / inch, inner layer 2 weft plain knit, tuck stitch loop length 2.7mm, workshop temperature 24℃, relative humidity 63%; Greige fabric inspection: No broken yarns or missing needles; warp yarn density deviation 101 +2 yarns / inch; weft yarn density deviation 102 +1 yarn / inch; width deviation +0.9cm.

[0067] Dyeing and UV-resistant finishing: Dyeing solution: Disperse dye (color: black), 2-hydroxy-4-methoxybenzophenone (purity 99.4%) added at 12% of dye weight, sodium dodecylbenzenesulfonate at 1.0% of dyeing solution weight, acetic acid to adjust pH to 4.6, stirred at 46℃ and 80r / min; Dyeing: Lixin TX210 high temperature and high pressure jet dyeing machine, dye liquor circulation rate 58L / min, fabric dynamic tension 12cN, room temperature dyeing (10min) → heating up to 86℃ at 2℃ / min (20min) → heating up to 118℃ at 1℃ / min (42min) → cooling down to 60℃ at 3℃ / min and draining, color difference value ΔE=0.9; Fixation: Add isocyanate crosslinking agent (60% of absorbent mass) at 80℃, keep warm for 26 min, and wash twice with water at 60℃ (residual amount 0.2%).

[0068] Setting: 170℃, 17m / min speed, 1.62m width (1.08x magnification), 3.0% anti-wrinkle agent, 27℃ cooling for 6min.

[0069] Performance test results: Water repellency rating: Level 5, Level 4 after 20 washes; UV protection UPF value: 60, 48 after 20 washes; Moisture permeability: 8300g / (㎡・24h); Tensile recovery rate: 87%; Bending stiffness: 26 mN·m, flexibility rating: 4; Color fastness: Color fastness to rubbing is grade 4-5, color fastness to washing is grade 4-5; Washing shrinkage: 1.1%, wrinkle recovery angle: 195°, warp breaking strength loss rate: 8%, weft breaking strength loss rate: 5%.

[0070] As shown in the table, the fabric of this invention is significantly superior to the prior art in all core indicators: its water repellency and UV resistance are more than twice that of existing fabrics, its moisture permeability is increased by more than 40%, its softness is increased by more than 30%, its tensile recovery rate is increased by more than 10%, its washing shrinkage rate is reduced by more than 50%, and its strength loss rate is reduced by more than 60%, which fully verifies the technical advantages of this invention.

[0071] The foregoing has shown and described the basic principles and main features of the present invention, as well as its advantages. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the present invention. Various changes and modifications can be made to the present invention without departing from its spirit and scope. All such changes and modifications fall within the scope of the present invention as claimed, which is defined by the appended claims and their equivalents.

Claims

1. A water-repellent and UV-resistant fabric, characterized in that: The structure comprises a double-layered structure consisting of an outer layer (1) and an inner layer (2). The outer layer (1) is woven from warp yarns (101) and weft yarns (102). Both the warp yarns (101) and the weft yarns (102) are nylon 66 yarn or polyester DTY yarn treated with water repellency. The yarn linear density is 40S-60S, the warp yarn (101) density is 120-150 yarns / inch, and the weft yarn (102) density is 90-110 yarns / inch. The inner layer is a core-spun yarn of spandex and nylon low-elasticity yarn, with spandex yarn having a mass fraction of 5%-8% and nylon low-elasticity yarn having a linear density of 30D-50D; The outer layer (101) and the inner layer are connected by a "1-separated-1" coil structure, with the coil length of the coil structure being 2.5mm-3.0mm.

2. A method for preparing a water-repellent and UV-resistant fabric, based on the fabric described in claim 1, characterized in that: Includes the following steps: Step 1: Yarn Pretreatment Preparation of water-repellent finishing solution: Mix fluorine-free waterproof finishing agent, penetrant, and crosslinking agent in a mass ratio of 100:5:8, and dilute with deionized water to a mass concentration of 15%-20%; Yarn impregnation: Place nylon 66 yarn or polyester DTY yarn into a water-repellent finishing solution and impregnate for 30-40 minutes at 40℃-50℃ and a liquor ratio of 1:10, stirring at a rate of 60r / min during impregnation. Drying and baking: Dry with hot air at 80℃-90℃ for 30 minutes, followed by baking at 150℃-160℃ for 2-3 minutes, with a baking tension of 5N-8N; Step 2: Fabric Weaving Weaving: 18-22 needles / inch double-sided knitting machine, 20r / min-25r / min speed, surface layer (101) plain weave, inner layer weft plain weave, tuck weave connection, workshop temperature 22℃-25℃, relative humidity 60%-65%; Fabric inspection: The fabric is free of broken yarns, missing needles, and stains. The density deviation of warp yarns (101) is ≤ ±2 yarns / inch, the density deviation of weft yarns (102) is ≤ ±1 yarn / inch, and the width deviation is ≤ ±1cm. Step 3: Dyeing and UV Protection Finishing Dye liquor preparation: Select disperse dyes (for polyester) or acid dyes (for nylon), add UV absorber, leveling agent, and pH adjuster. The UV absorber is 8%-12% of the dye mass, the leveling agent is 0.5%-1% of the dye liquor mass, and the pH is adjusted to 4.5-5.

5. Stir at 40℃-50℃ and 80r / min. Dyeing: The greige fabric is put into the dyeing machine. At room temperature and liquor ratio of 1:5-8, it is kept at the temperature for 10 minutes, then heated at 2℃ / min to 80℃-90℃ and kept at the temperature for 20 minutes, then heated at 1℃ / min to 110℃-120℃ (polyester) or 95℃-100℃ (nylon) and kept at the temperature for 40-50 minutes, then cooled at 3℃ / min to 60℃ and drained. UV-resistant fixation: Add deionized water and heat to 70℃-80℃, add isocyanate crosslinking agent (50%-60% of the mass of UV absorber), keep warm for 30 minutes, and wash twice with 60℃ warm water for 10 minutes each time; Step 4: Shaping Setting process: Setting at 160℃-170℃ and 15m / min-20m / min speed, with a fabric width of 1.05-1.1 times that of the greige fabric, and adding polyamide epichlorohydrin resin anti-wrinkle agent (2%-3% of the fabric weight). Cooling and testing: Cool at 25℃-30℃ for 5-10 minutes, and test water repellency rating, UPF value and other indicators.

3. A method for preparing a water-repellent and UV-resistant fabric, based on the fabric described in claim 2, characterized in that: In step 1, the fluorine-free waterproofing agent is used; the penetrant is fatty alcohol polyoxyethylene ether; and the crosslinking agent is hexamethoxymethyl melamine.

4. A method for preparing a water-repellent and UV-resistant fabric, based on the fabric described in claim 2, characterized in that: In step 3, the UV absorber is 2-hydroxy-4-methoxybenzophenone with a purity of ≥99%, a lightfastness rating of ≥7, and a UPF value decrease of ≤5% after 100 hours of exposure.

5. A method for preparing a water-repellent and UV-resistant fabric, based on the fabric described in claim 2, characterized in that: In step 2, the double-sided knitting machine used for weaving has a needle pitch adjustment accuracy of 0.1 needles / inch to ensure that the uniformity deviation of the weaving density is ≤ ±1 needle / inch.

6. A method for preparing a water-repellent and UV-resistant fabric, based on the fabric described in claim 2, characterized in that: In step 3, a high-temperature and high-pressure jet dyeing machine is used for dyeing, with a dye liquor circulation rate of ≥50L / min. During the dyeing process, the dynamic tension of the fabric is controlled at 8cN-12cN to avoid fabric stretching and deformation. The color difference value ΔE after dyeing is ≤1.

5.

7. A method for preparing a water-repellent and UV-resistant fabric, based on the fabric described in claim 2, characterized in that: In step 1, the moisture content of the yarn after impregnation is controlled at 4%-6%, and the cross-linking degree of the water-repellent finishing agent on the yarn surface after baking is ≥90%, and the yarn bending stiffness is ≤30mN・m, to ensure the yarn flexibility during subsequent weaving.

8. A method for preparing a water-repellent and UV-resistant fabric, based on the fabric described in claim 2, characterized in that: In step 4, the washed shrinkage rate of the fabric after shaping is ≤2%, the wrinkle recovery angle is ≥180°, the warp breaking strength loss rate is ≤8%, and the weft breaking strength loss rate is ≤6%, which meets the strength and dimensional stability requirements of outdoor clothing.

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