Flame-retardant antibacterial water-repellent elastic fabric and preparation method thereof

Abstract

The invention relates to a flame-retardant antibacterial water-repellent elastic fabric and a preparation method thereof. Yarns adopted by the fabric comprise spandex fiber yarns, combed cotton yarns and spandex elastic fiber yarns. A double-sided circular knitting machine is adopted to weave grey cloth, and the obtained grey cloth is at least subjected to water-repellent finishing to obtain the fabric, the combed cotton yarn is used for being woven into the outer layer of the gray fabric, the spandex fiber yarn is used for being woven into the inner layer of the gray fabric, and the spandex elastic fiber yarn is used for being woven into the middle connecting layer of the gray fabric. The spandex fiber yarn, the combed cotton yarn and the spandex elastic fiber yarn are woven to form a unique organization structure, so that the fabric has the advantages of the three materials; the gray fabric obtained by weaving is subjected to water-repellent finishing, so that the lasting flame-retardant antibacterial and water-repellent functional fabric is obtained, and the fabric can be used for light sports or casual coats.

Description

Technical Field

[0001] This invention relates to the field of fabric technology, and in particular to a flame-retardant, antibacterial, water-repellent elastic fabric and its preparation method. Background Technology

[0002] With increasing emphasis on health, outdoor light exercise is becoming increasingly popular. Choosing appropriate sportswear for outdoor light exercise can enhance the user experience.

[0003] For example, Chinese invention patent application CN119162817A discloses a quick-drying, UV-resistant sportswear fabric, comprising nylon fibers, polyester fibers, and spandex fibers. The sportswear fabric is woven from nylon, polyester, and spandex fibers and treated with a UV-resistant agent, which includes ethanol, water, an inorganic UV-blocking agent, isoamyl 4-methoxycinnamate, and cocoyl diethanolamide. Its specific formula includes the following raw materials: 20-30 parts ethanol, 60-70 parts water, 3-8 parts inorganic UV-blocking agent, 2-3 parts isoamyl 4-methoxycinnamate, and 1-2 parts cocoyl diethanolamide. This UV-resistant treatment not only imparts UV protection to the fabric but also reduces the moisture absorption of the fibers, improving waterproofing. This allows the fabric to be breathable and wick away moisture during wear, preventing stuffiness and providing quick-drying benefits, thus protecting skin health and ensuring comfortable wear. While the fabrics described above possess UV resistance, water resistance, and quick-drying breathability, they lack antibacterial and flame-retardant properties.

[0004] Therefore, there is considerable room for improvement in the existing technology. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a flame-retardant, antibacterial, water-repellent elastic fabric and its preparation method. The fabric has a smooth, lightweight, and elastic surface, and can prevent rain during sports activities. In the event of a sudden fire and personal danger, the inner layer of nylon fibers has excellent flame-retardant properties, which can effectively protect personal safety.

[0006] To achieve the above objectives, this invention proposes a flame-retardant, antibacterial, and water-repellent elastic fabric. The fabric uses yarns including methylene fiber yarn, combed cotton yarn, and spandex elastic fiber yarn. It is woven into a greige fabric using a double-sided circular knitting machine, and the resulting greige fabric undergoes at least a water-repellent finishing process to obtain the fabric. The combed cotton yarn is used to weave the outer layer of the greige fabric, the methylene fiber yarn is used to weave the inner layer of the greige fabric, and the spandex elastic fiber yarn is used to weave the middle connecting layer of the greige fabric.

[0007] According to the above scheme, the combed cotton yarn is 40-60 count compact spun or compact Siro spun cotton yarn, the polyvinyl chloride fiber yarn is 40-60 count ring-spun colored yarn, and the spandex elastic fiber yarn has a specification of 20-40D.

[0008] According to the above scheme, the needle arrangement of the double-sided circular knitting machine is as follows: the upper cylinder needles are arranged alternately with size 2 and size 1 needles; the lower cylinder needles are arranged alternately with size 1 and size 2 needles; the greige fabric is woven using the following method: First row: The upper needle plate uses needles 1 and 2 to form circles, and the lower needle cylinder uses needles 1 and 2 to weave floats; the yarn in the first row is the combed cotton yarn, and the outer layer of the greige fabric is woven repeatedly to obtain the outer layer of the greige fabric; Second path: the lower needle cylinder uses needles 1 and 2 to form loops, and the upper needle plate uses needles 1 and 2 to knit floats; the second path yarn uses the aforementioned methylene fiber yarn, and the inner layer of the fabric is woven repeatedly. Third path: the upper needle #2 gathers the loop, the upper needle #1 floats the yarn, the lower needle #2 gathers the loop, and the lower needle #1 floats the yarn; the third path yarn uses the spandex elastic fiber yarn, and the process is repeated to weave the middle connecting layer of the fabric. Fourth row: The upper needle plate uses needles 1 and 2 to form loops, and the lower needle cylinder uses needles 1 and 2 to weave floats; the fourth row yarn is made of the combed cotton yarn, and the outer layer of the greige fabric is woven repeatedly. Fifth row: The lower needle cylinder uses needles 1 and 2 to form loops, and the upper needle plate uses needles 1 and 2 to knit floats; the fifth row yarn uses the metal fiber yarn, and is repeatedly woven to obtain the inner layer of the fabric. Sixth row: upper needle #1 gathers the yarn, upper needle #2 floats the yarn, lower needle #1 gathers the yarn, upper needle #2 floats the yarn; the sixth row yarn uses the spandex elastic fiber yarn, and is woven repeatedly to obtain the middle connecting layer of the greige fabric.

[0009] According to the above scheme, the fabric weight is 200-280 g / m². 2 By setting the fabric weight, the fabric can be made suitable for use as a light sports or casual jacket.

[0010] According to the above scheme, the features include the following steps: weaving - opening and rolling - fabric preparation - pre-shaping - double-sided singeing - pre-treatment - enzyme washing - dyeing - opening and water squeezing - loose drying - mid-term inspection - water-repellent finishing and shaping - softening and shaping treatment - post-inspection.

[0011] According to the above scheme, the process of the pre-form is as follows: pre-form temperature 195℃, machine speed 20m / min.

[0012] According to the above scheme, the pretreatment process is as follows: add 1-2 g / L of penetrant, 1-2 g / L of refining agent, 1.5-2.5 g / L of caustic soda flakes, and 4-6 g / L of hydrogen peroxide, and treat at 90-100℃ for 30-40 min. After treatment, the core absorption height of the fabric is greater than 15 cm / 30 min.

[0013] According to the above scheme, the enzyme washing process is as follows: the greige fabric is placed in the enzyme washing solution at a bath ratio of 1:10-15 and treated at a temperature of 40-60℃ for 40-80 minutes; the pH value of the enzyme washing solution is 4.5-6.5, and the dosage is: 1-2g / L neutral enzyme, 0.5-1.0g / L sodium acetate and 0.5-1.0g / L acetic acid, and the solvent is water.

[0014] According to the above scheme, the dyeing process includes the following steps: (1) Place the greige fabric in a dyeing agent for dyeing. The dyeing agent includes reactive dye, 80 g / L sodium sulfate, and 15 g / L soda ash. First, add sodium sulfate and reactive dye, then raise the temperature to 60°C at 1-1.5°C / min, then add soda ash and dye for 20 min. (2) Soap washing treatment: Add soap detergent for washing, wash at 98℃ for 10 minutes, wash twice with soap detergent, then maintain at 80℃ for 10 minutes, then add glacial acetic acid, cool down to 40℃ and maintain for 10 minutes.

[0015] According to the above scheme, the water-repellent finishing process is as follows: the finishing agent is used for finishing on a finishing machine, the finishing temperature is 155-175℃, and the machine speed is 16-20m / min; the finishing agent contains 50-100g / L water-repellent agent, 80-150g / L ice-feeling silicone oil and 1-2g / L penetrant, and the solvent is water.

[0016] Compared with the prior art, the present invention has the following beneficial effects: This invention uses combed cotton yarn to weave the outer layer of a fabric, methylene fiber yarn to weave the inner layer, and spandex elastic fiber yarn to weave the middle connecting layer. The resulting fabric undergoes at least a water-repellent finish to obtain the fabric described above. By weaving these three materials—methylene fiber yarn, combed cotton yarn, and spandex elastic fiber yarn—into a unique structure, the fabric combines the advantages of all three materials. The water-repellent finish on the woven fabric results in a durable, flame-retardant, antibacterial, and water-repellent fabric suitable for light sportswear or casual outerwear. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the weaving of the fabric described in Embodiment 1 of the present invention.

[0018] In the diagram: 1. Needle No. 1; 2. Needle No. 2. Detailed Implementation

[0019] The present invention will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are only for explaining the present invention and are not intended to limit the present invention.

[0020] In current technologies, outdoor light sportswear generally focuses on quick-drying breathability and UV protection, but lacks consideration for flame retardancy and antibacterial properties. Traditional sports fabrics mostly use single-layer or double-layer structures, making it difficult to simultaneously meet the requirements of water-repellent treatment and elastic support. Taking nylon, polyester, and spandex composite fabrics as an example, they achieve waterproofing and quick-drying through UV-resistant treatment, but the fibers themselves do not possess flame-retardant properties, and the antibacterial function relies entirely on post-treatment processes, resulting in insufficient functional durability.

[0021] To address these issues, researchers first analyzed the actual conditions of fabrics in outdoor sports scenarios, including the risk of open flames and bacterial growth from sweat. Traditional flame-retardant finishing processes can damage the fiber structure and affect elasticity recovery; while single antibacterial coatings are prone to failure after repeated washing. Research on inherently flame-retardant fibers revealed that nylon fibers form a dense carbon layer during combustion, which can block oxygen supply and achieve self-extinguishing; its smooth surface also inhibits bacterial adhesion. Further considering comfort requirements, the outer layer uses high-count combed cotton to form a smooth base, while the middle layer connects the inner and outer layers with elastic fibers, maintaining overall tensile strength while preventing the elastic fibers from directly contacting the skin and causing allergies.

[0022] This invention proposes a fabric structure woven from a combination of polyvinyl chloride fiber yarn, combed cotton yarn, and spandex elastic fiber yarn. The combed cotton yarn is positioned as the outer layer, the polyvinyl chloride fiber yarn as the inner layer, and the spandex elastic fiber yarn as the intermediate connecting layer using a double-sided circular knitting machine. The final product is obtained after water-repellent finishing.

[0023] Among them, polyacrylonitrile fiber yarn refers to inherently flame-retardant yarn made from pre-oxidized polyacrylonitrile fibers, specifically produced using ring spinning technology to create 40-60 count yarn. During pyrolysis, it generates a dense carbon layer that blocks the combustion chain reaction. Combed cotton yarn refers to high-quality cotton yarn after short fibers have been removed by a combing machine. Specifically, it can be produced using compact spinning or compact Siro spinning processes to create 40-60 count yarn, forming a smooth surface for even adhesion of water-repellent agents. Spandex elastic fiber yarn refers to elastic yarn containing polyurethane segments, specifically produced using 20-40D core-spun yarn, forming an elastic connecting layer through tuck knitting. Double-sided circular knitting refers to circular weft knitting equipment that uses upper and lower needle plates working in tandem, achieving precise positioning of a three-layer structure through a six-way cyclic knitting program.

[0024] Specifically, the outer layer of combed cotton yarn is spun with a high count to form a dense fabric structure, providing a smooth base for the water-repellent finishing and preventing the penetration of auxiliaries that could cause functional loss in the inner layer. The inner layer of polyvinyl chloride (PVC) fibers utilizes their inherent flame-retardant properties to achieve permanent fire resistance, and their dense surface physically blocks bacterial growth. The intermediate connecting layer uses spandex elastic fibers interwoven in a loop pattern to form an elastic support network in the longitudinal direction and maintain dimensional stability of the fabric in the transverse direction. The six-way weaving program of the double-sided circular knitting machine alternately completes the outer layer weaving, inner layer weaving, and elastic layer connection, creating a gradient functional distribution in the thickness direction of the three-layer structure. The water-repellent finishing only applies to the outer layer cotton yarn, ensuring waterproof performance without affecting the breathability of the inner layer.

[0025] Existing technologies rely on finishing processes to achieve waterproofing using nylon / polyester / spandex composite structures. This invention, however, utilizes the inherent properties of methylene fiber to achieve permanent flame retardancy. The combed cotton outer layer combines with a water-repellent agent to form a stable waterproof layer, while the spandex middle layer maintains elasticity while preventing direct skin contact. Existing technologies rely on chemical coatings for antibacterial function; this invention utilizes the surface properties of methylene fiber to achieve physical antibacterial properties, avoiding skin irritation from chemical additives.

[0026] Through the above technical solution, this invention achieves inherent flame retardancy and physical antibacterial functions without chemical treatment while maintaining the fabric's elasticity and water-repellent properties. The outer layer's water-repellent treatment and the inner layer's flame-retardant and antibacterial functions do not interfere with each other, and the middle elastic layer effectively balances the fabric's tensile recovery rate and dimensional stability, solving the technical defects of traditional sports fabrics, such as limited functionality and poor durability.

[0027] The present invention further proposes that the combed cotton yarn is 40-60 count compact spun or compact Siro spun cotton yarn, the polyvinyl chloride fiber yarn is 40-60 count ring-spun colored yarn, and the spandex elastic fiber yarn has a specification of 20 to 40D.

[0028] Compact spun or compact Siro spun cotton yarn refers to cotton yarn produced through compact spinning or compact Siro spinning processes. This can be achieved using high-count spinning technology, resulting in a smooth yarn surface and a compact structure, reducing fuzz. Ring-spun colored yarn refers to methylene fiber yarn pre-dyed using a ring spinning process. This can be achieved by adding color masterbatch or dyeing agents during the spinning stage, avoiding the impact of subsequent dyeing processes on the fiber's flame-retardant properties. Spandex elastic fiber yarn with a specification of 20 to 40D refers to a yarn fineness within the range of 20 to 40 denier. This can be achieved using a fine denier spandex twisting process, reducing yarn thickness while maintaining elasticity.

[0029] Specifically, the outer layer uses high-count compact spun or compact Siro-spun cotton yarn. The high-density arrangement of the yarns creates a smooth fabric surface, which facilitates the uniform adhesion of water-repellent finishing agents. The middle connecting layer uses fine denier spandex yarn, which forms an elastic mesh structure through a loop-knitting method, maintaining the fabric's elasticity while avoiding excessive stretching that could lead to structural deformation. The inner layer uses methylene fiber treated with ring-spun colored yarn, completing the coloring process during the spinning stage. This preserves the fiber's inherent flame-retardant properties while avoiding the damage to flame-retardant performance caused by subsequent high-temperature dyeing. The counts and specifications of the three types of yarns are matched. For example, when the combed cotton yarn uses a 40-count compact Siro-spun process, the methylene yarn is correspondingly selected using a 40-count ring-spun process, and the spandex is selected as a 30D specification. This count matching achieves a tightly composite multi-layer structure.

[0030] This invention further proposes a needle arrangement method for a double-sided circular knitting machine: the upper cylinder needles are arranged alternately with size 2 and size 1 needles, and the lower cylinder needles are arranged alternately with size 1 and size 2 needles. The greige fabric adopts a six-way knitting method. The first and fourth ways use combed cotton yarn to form loops on the upper cylinder and floats on the lower cylinder to form the outer layer; the second and fifth ways use polyvinyl chloride fiber yarn to form loops on the lower cylinder and floats on the upper cylinder to form the inner layer; the third and sixth ways use spandex elastic fiber yarn to alternately loop and floats on the upper and lower cylinders to form the intermediate connecting layer.

[0031] Alternating needle arrangement refers to the use of different needle sizes in the upper and lower needle cylinders, creating a staggered structure and enhancing the fabric's density. Looping refers to the formation of loops at the needle hook, constituting the main structure of the fabric. Float yarn refers to yarn that does not form loops between needles, but only extends laterally, reducing interlayer friction. Tucked loops refer to the continuous formation of multiple loops on the same needle, creating elastic nodes.

[0032] Specifically, the outer layer uses combed cotton yarn looped on the upper needle cylinder to form a smooth covering layer, ensuring both breathability and water repellency. The inner layer uses polyvinyl chloride fiber yarn looped on the lower needle cylinder to form a flame-retardant and antibacterial layer, with floats reducing friction with other layers. The middle connecting layer uses alternating loops and floats of spandex elastic fibers to form an elastic support structure. The third and sixth rows use different looping needle sizes, allowing the elastic fibers to form interlacing connection points in the middle layer, enhancing the interlayer bonding force. The six-row cyclic knitting ensures that each layer is formed independently, while the looping design in the middle layer maintains elasticity and structural stability.

[0033] The present invention further proposes that the weight of flame-retardant, antibacterial, water-repellent elastic fabric be controlled at 200-280 g / m².

[0034] Fabric weight per unit area refers to the weight of the fabric. This can be achieved by adjusting the yarn count, weaving density, or finishing process parameters. For example, by changing the needle arrangement or yarn combination ratio on a double-sided circular knitting machine, the fabric can be made lighter while maintaining structural stability. This parameter range, by balancing the protective layer thickness and yarn usage, ensures that the fabric maintains its lightweight properties while possessing flame-retardant, antibacterial, and water-repellent functions.

[0035] Specifically, when a three-layer composite structure is formed by polyvinyl chloride (PVC) fiber yarn, combed cotton yarn, and spandex elastic fiber yarn, a weight of less than 200 g / m² may result in insufficient density of the outer combed cotton yarn, affecting water repellency and abrasion resistance, while the flame-retardant effect of the inner PDC fiber may be weakened due to excessively thin yarn. Conversely, a weight of more than 280 g / m² will cause the spandex elastic fiber in the middle connecting layer to have reduced resilience due to excessively dense yarn, while also increasing the overall thickness of the fabric, leading to decreased breathability. By limiting the weight within this range, the synergistic effect of the multi-layer functional structure can be satisfied, while avoiding a feeling of restriction during movement due to excessive weight.

[0036] This invention further proposes a method for preparing flame-retardant, antibacterial, and water-repellent elastic fabric, comprising the following steps: weaving - opening and rolling - fabric preparation - pre-shaping - double-sided singeing - pretreatment - enzyme washing - dyeing - opening and water squeezing - loose drying - intermediate inspection - water-repellent finishing and shaping - softening and shaping treatment - post-inspection.

[0037] The process includes several key steps: **Pre-setting:** First, high-temperature treatment to achieve dimensional stability in the fabric. This can be achieved using equipment running at 195℃ and a speed of 20m / min. This step eliminates internal stress generated during weaving, preventing fabric deformation during subsequent processing. Second, double-sided singeing: This involves flame treatment of both sides of the fabric, typically using a gas-fired singeing machine. This removes surface fuzz from the yarns, improving the fabric's smoothness. Third, enzyme washing: This process uses biological enzymes to decompose fiber impurities. This can be achieved using neutral enzymes at 40-60℃ for 40-80 minutes. This gently removes surface impurities without damaging the flame-retardant fiber structure. Fourth, water-repellent finishing: This process imparts water-repellent properties to the fabric. This can be achieved using a finishing solution containing water-repellent agents and ice-sensitive silicone oil at 155-175℃. This step creates a hydrophobic layer on the fabric surface while maintaining the elasticity of the fibers.

[0038] Specifically, the multi-layered woven fabric is unrolled and pre-shaped to fix its form, then singed on both sides to eliminate surface fuzz. The pretreatment process uses penetrants and refining agents to remove impurities, and enzyme washing further cleans the fiber surface. The dyeing process employs staged temperature increases and electrolyte-assisted dyeing to ensure the dyeing depth of the cotton layer. The water-repellent finishing and setting process forms a stable waterproof layer within a controlled temperature range, while the softening finishing treatment uses silicone oil to improve the fabric's feel. All processes are controlled collaboratively with parameters to achieve a balance between antibacterial, water-repellent, and elastic functions while preserving the flame retardancy of the polyvinyl chloride fibers.

[0039] Compared to existing technologies, current manufacturing processes for UV-resistant sportswear fabrics do not include flame-retardant fiber treatment, enzyme washing, and phased water-repellent finishing steps, resulting in products lacking flame-retardant and antibacterial properties. This invention, by adding a layer of methylene fiber weave, using enzyme washing to protect the flame-retardant structure, and employing a low-temperature water-repellent setting process, achieves, for the first time, an integration of flame-retardant and antibacterial properties while maintaining elasticity and waterproofing.

[0040] Through the above technical solution, this invention resolves the technical contradiction that existing sports fabrics cannot simultaneously possess flame retardancy, antibacterial properties, water repellency, and elasticity. Specifically, the multi-layered weaving structure allows the flame-retardant fibers and antibacterial cotton layer to be independently distributed, avoiding functional interference; the enzyme washing process cleans the fabric while preventing strong alkalis from damaging the polymethyl methacrylate fibers; and the staged water-repellent finishing forms a stable waterproof layer under low-temperature conditions, preventing high-temperature deterioration of elastic fibers. The resulting fabric can simultaneously address the risks of fire, bacterial growth, liquid penetration, and the demands of motion deformation in outdoor sports scenarios.

[0041] The present invention further proposes that the temperature be set at 195 degrees Celsius and the machine speed be controlled at 20 meters per minute in the predetermined process.

[0042] The pre-setting temperature refers to the process of rearranging the fiber molecular chains of the fabric and eliminating internal stress through high-temperature treatment. This can be achieved using a hot air circulating stenter, where the temperature is controlled at 195 degrees Celsius to bring the fibers above their glass transition temperature, promoting molecular chain movement and fixing the interwoven structure. The machine speed refers to the speed at which the fabric travels within the stenter, which can be achieved using a variable frequency speed-regulating motor in conjunction with a guide roller system. By setting the machine speed to 20 meters per minute, sufficient time is ensured for the fabric to remain in the high-temperature zone to stabilize the fiber morphology.

[0043] Specifically, under high temperature, the crystalline regions inside the fiber partially melt, while the molecular chain segments in the amorphous regions rearrange. The stress generated during weaving is released, and the yarn interlacing points are fixed, thus preventing dimensional changes caused by heat shrinkage or mechanical stretching during subsequent processing. The coordinated control of machine speed and temperature ensures uniform heating of the fabric, avoiding localized overheating that could lead to fiber damage or structural loosening due to insufficient setting. The improved surface smoothness of the fabric treated with this process provides a foundation for the uniform application of auxiliaries during water-repellent finishing.

[0044] The present invention further proposes a pretreatment process of adding 1-2 g / L of penetrant, 1-2 g / L of refining agent, 1.5-2.5 g / L of caustic soda flakes, and 4-6 g / L of hydrogen peroxide, and treating at 90-100℃ for 30-40 min, so that the core absorption height of the fabric is greater than 15 cm / 30 min.

[0045] Among them, penetrants are compounds that can reduce the surface tension of liquids to promote the penetration of the treatment solution into the fibers. Specifically, nonionic surfactants can be used, which accelerate solution penetration by disrupting the hydrophobic barrier on the fiber surface. Refining agents are chemical auxiliaries used to remove impurities and natural waxes from the fiber surface. Specifically, anionic composite surfactants can be used, which remove hydrophobic substances from the fiber surface through emulsification. Caustic soda refers to solid sodium hydroxide tablets, specifically industrial-grade sodium hydroxide flakes, which induce swelling of cellulose fibers by adjusting the pH of the treatment solution. Hydrogen peroxide refers to an aqueous solution of hydrogen peroxide, specifically a 30% hydrogen peroxide solution, which decomposes at high temperatures to generate reactive oxygen free radicals to oxidize and decompose fiber impurities. Core height refers to the height of liquid rising vertically along the fabric per unit time, specifically measured using the GB / T 21655.1 standard test method, and its value reflects the strength of the capillary effect of the fabric.

[0046] Specifically, the penetrant and refining agent work synergistically in the solution. The penetrant reduces the surface tension of the liquid, allowing the treatment solution to quickly wet the fibers, while the refining agent emulsifies and removes hydrophobic substances from the fiber surface. The dissolved caustic soda creates a strongly alkaline environment, promoting the breakage of hydrogen bonds between cellulose molecular chains, causing the fibers to swell and increase internal porosity. Hydrogen peroxide decomposes at high temperatures, generating hydroxyl radicals that oxidize and decompose fiber biomass, while avoiding damage to the fibers from a strong acid environment. The treatment temperature is controlled within the 90-100℃ range to ensure effective decomposition of hydrogen peroxide while preventing excessive fiber hydrolysis. The treatment time is maintained at 30-40 minutes to ensure sufficient fiber swelling and impurity removal. A final wicking height exceeding 15cm / 30min indicates the formation of a uniform capillary structure in the fabric.

[0047] The present invention further proposes an enzyme washing process in which the greige fabric is placed in an enzyme washing solution at a bath ratio of 1:10-15 and treated at a temperature of 40-60 degrees Celsius for 40-80 minutes; the pH value of the enzyme washing solution is 4.5-6.5, and the dosage is 1-2 grams per liter of neutral enzyme, 0.5-1.0 grams per liter of sodium acetate and 0.5-1.0 grams per liter of acetic acid, with water as the solvent.

[0048] The liquor ratio refers to the volume ratio of the greige fabric to the enzyme washing solution, which can be achieved using a ratio of 1:10 to 1:15. This ratio ensures sufficient contact between the greige fabric and the enzyme washing solution, avoiding uneven treatment due to an insufficient liquor ratio or resource waste due to an excessively large ratio. The neutral enzyme refers to a biological enzyme with catalytic activity within a neutral pH range. Specifically, a neutral protease that hydrolyzes protein impurities can be used to decompose organic residues on the surface of the greige fabric through enzymatic hydrolysis. Sodium acetate and acetic acid are components of the buffer system, and a mixed solution of the two can be used to maintain the pH of the enzyme washing solution stable within the range of 4.5-6.5, preventing pH fluctuations from affecting enzyme activity or damaging the fibers. The treatment temperature of 40-60 degrees Celsius refers to the ambient temperature of the enzyme washing reaction. This temperature can be controlled using a constant temperature water bath to ensure the catalytic efficiency of the neutral enzyme while preventing high temperatures from damaging the structure of the spandex elastic fibers.

[0049] Specifically, during the enzymatic washing process, the fabric and the enzymatic washing solution are in full contact at a specific bath ratio. The neutral enzyme catalyzes the decomposition of proteinaceous impurities on the fabric surface within a pH range maintained by the buffer system. The temperature is controlled within the range of 40-60 degrees Celsius to activate enzyme activity while avoiding thermal damage to the elastic fibers. The treatment time of 40-80 minutes ensures the enzymatic reaction is fully completed, while preventing fiber swelling or degradation of mechanical properties due to prolonged soaking. The buffer system formed by sodium acetate and acetic acid stabilizes the reaction conditions, reducing the interference of pH fluctuations on enzyme activity, thereby achieving efficient removal of impurities under mild conditions.

[0050] The present invention further proposes a dyeing process including the following steps: placing the greige fabric in a dyeing agent for dyeing, the dyeing agent including reactive dyes, sodium sulfate, and soda ash; first adding sodium sulfate and reactive dyeing agent, then gradually increasing the temperature to a set temperature, adding soda ash and dyeing; subsequently performing a soaping treatment, including high-temperature washing, a holding stage and glacial acetic acid cooling treatment.

[0051] Among them, reactive dyes refer to dyes containing reactive groups that can form covalent bonds with fibers. Specifically, dyes containing vinyl sulfone or triazine groups can be used, which improve color fastness through chemical bonding. Sodium sulfate refers to a sodium sulfate salt-based dyeing accelerator, specifically industrial-grade anhydrous sodium sulfate, which promotes dye adsorption by increasing the ionic strength of the dye liquor. Soda ash refers to a sodium carbonate alkalinity regulator, specifically food-grade sodium carbonate powder, which optimizes the fixing reaction by controlling the pH value through staged addition. Soaping agents refer to surfactant complexes, specifically polyoxyethylene ether compounds, which remove unfixed dyes by reducing interfacial tension. Glacial acetic acid is a weak acid neutralizing agent, specifically a 99% acetic acid solution, which balances the surface charge state of the fibers by adjusting the pH value.

[0052] Specifically, when reactive dyes and sodium sulfate work synergistically in the dyeing agent, the ionic strength effect of sodium sulfate promotes the migration of dye molecules to the fiber surface. The phased addition of soda ash avoids excessively strong alkalinity that could cause fiber swelling and deformation. A gradient heating strategy controls the dye penetration rate, ensuring simultaneous coloring of the fiber interior and surface, reducing fiber shrinkage caused by sudden temperature changes. After the dyeing stage, two high-temperature soaping washes thoroughly remove free dye particles from the fiber gaps, preventing residues from reacting with auxiliaries during subsequent water-repellent finishing. The 80℃ maintenance stage enhances the soaping agent's ability to remove deep-seated impurities through thermodynamic action, while the glacial acetic acid treatment stage reduces thermal stress deformation of the spandex elastic layer through a step-down temperature decrease, maintaining the fabric's elasticity recovery rate.

[0053] This invention further proposes a water-repellent finishing process using a finishing agent on a finishing machine, with the finishing temperature controlled in the range of 155-175 degrees Celsius and the machine speed controlled in the range of 16-20 meters per minute; the finishing agent contains 50-100 grams of water-repellent agent per liter, 80-150 grams of ice-feeling silicone oil per liter and 1-2 grams of penetrant per liter, with water as the solvent.

[0054] Among them, the water-repellent agent refers to an organic fluorine compound that forms a hydrophobic layer on the fiber surface through chemical bonding. Specifically, it can be achieved using perfluoroalkyl acrylate copolymers. Its concentration range ensures the formation of a continuous film on the fiber surface while avoiding clogging the fabric pores. The cooling silicone oil refers to a finishing agent containing amino-modified siloxanes, specifically polyether-modified silicone oil. Its addition amount ensures a cool touch without affecting the fabric's breathability. The penetrant refers to a nonionic surfactant that reduces the surface tension of liquids. Specifically, it can be achieved using fatty alcohol polyoxyethylene ethers. Its concentration range promotes the uniform penetration of the auxiliaries into the multi-layered fabric structure. The setting temperature range is selected based on the thermal stability threshold of the polyvinyl chloride fiber, activating the cross-linking reaction of the auxiliaries while preventing fiber thermal degradation. The machine speed range is matched with the temperature parameters to ensure that the auxiliaries fully diffuse and cure within the fabric.

[0055] Specifically, a temperature range of 155-175 degrees Celsius allows the water-repellent auxiliaries to form a stable cross-linked network on the surface of the polypropylene fibers. This temperature is below the decomposition temperature of polypropylene fibers, thus avoiding damage to their flame-retardant properties. A machine speed setting of 16-20 meters per minute controls the fabric's residence time on the hot rollers to within 20-30 seconds, ensuring that the auxiliaries fully penetrate into the gaps between the spandex fibers in the intermediate connecting layer. The water-repellent auxiliaries form a low surface energy layer through the directional alignment of fluorocarbon chains, while the ice-feel silicone oil forms a microsphere structure on the fiber surface to enhance the smooth feel. The penetrant reduces the surface tension of the solution, allowing the auxiliaries to penetrate into the inner layers along the yarn capillary channels. The water-based solvent system avoids the damage to the elasticity of spandex caused by organic solvents, while simultaneously promoting the gradient distribution of the auxiliaries in the multilayer structure.

[0056] Example 1: A flame-retardant, antibacterial, and water-repellent elastic fabric, wherein the yarn used in the fabric includes polyvinyl chloride fiber yarn, combed cotton yarn, and spandex elastic fiber yarn; the fabric is woven into a greige fabric using a double-sided circular knitting machine, and the greige fabric is subjected to at least a water-repellent finishing process to obtain the fabric. The combed cotton yarn is used to weave the outer layer of the fabric, the polyvinyl chloride fiber yarn is used to weave the inner layer of the fabric, and the spandex elastic fiber yarn is used to weave the middle connecting layer of the fabric. The combed cotton yarn is 40-count compact spun or compact Siro spun cotton yarn, the polyvinyl chloride fiber yarn is 40-count ring-spun colored yarn, and the spandex elastic fiber yarn has a specification of 20D.

[0057] Furthermore, the double-sided circular knitting machine has a needle pitch of 28G and a cylinder diameter of 34 inches. The needle arrangement is as follows: the upper cylinder contains needles of sizes 2 and 1, arranged alternately; the lower cylinder contains needles of sizes 1 and 2, arranged alternately. Figure 1 As shown, the greige fabric is woven using the following method: First row: The upper needle plate uses needles 1 and 2 to form circles, and the lower needle cylinder uses needles 1 and 2 to weave floats; the yarn in the first row is the combed cotton yarn, and the outer layer of the greige fabric is woven repeatedly to obtain the outer layer of the greige fabric; Second path: the lower needle cylinder uses needles 1 and 2 to form loops, and the upper needle plate uses needles 1 and 2 to knit floats; the second path yarn uses the aforementioned methylene fiber yarn, and the inner layer of the fabric is woven repeatedly. Third path: the upper needle #2 gathers the loop, the upper needle #1 floats the yarn, the lower needle #2 gathers the loop, and the lower needle #1 floats the yarn; the third path yarn uses the spandex elastic fiber yarn, and the process is repeated to weave the middle connecting layer of the fabric. Fourth row: The upper needle plate uses needles 1 and 2 to form loops, and the lower needle cylinder uses needles 1 and 2 to weave floats; the yarn in the fourth row is made of the combed cotton yarn, and the outer layer of the greige fabric is woven repeatedly. Fifth row: The lower needle cylinder uses needles 1 and 2 to form loops, and the upper needle plate uses needles 1 and 2 to knit floats; the fifth row yarn uses the metal fiber yarn, and is repeatedly woven to obtain the inner layer of the fabric. Sixth row: upper needle #1 gathers the yarn, upper needle #2 floats the yarn, lower needle #1 gathers the yarn, upper needle #2 floats the yarn; the sixth row yarn uses the spandex elastic fiber yarn, and is woven repeatedly to obtain the middle connecting layer of the greige fabric.

[0058] Furthermore, the fabric has a weight of 200g / m². 2 The weight deviation is within 2%, and the dimensional change after washing is controlled within -3.5%.

[0059] The present invention also provides a method for preparing the above-mentioned flame-retardant, antibacterial, water-repellent elastic fabric, comprising the following steps: S1, weaving; S2, Opening and rolling; S3, Prepare the fabric; S4, Pre-formed; The process for the pre-formed part is as follows: pre-formed temperature 195℃, machine speed 20m / min.

[0060] S5, Double-sided singeing; S6. Pretreatment; The pretreatment process is as follows: add 1g / L of penetrant, 1g / L of refining agent, 1.5g / L of caustic soda flakes and 4g / L of hydrogen peroxide, and treat at 90℃ for 30min. After treatment, the core absorption height of the fabric is greater than 15cm / 30min.

[0061] S7. Enzyme washing; The enzyme washing process is as follows: the greige fabric is placed in the enzyme washing solution at a bath ratio of 1:10 and treated at a temperature of 40℃ for 40 minutes; the pH value of the enzyme washing solution is 4.5, and the dosage is: 1g / L neutral enzyme, 0.5g / L sodium acetate and 0.5g / L acetic acid, and the solvent is water.

[0062] S8. Dyeing; The dyeing process includes the following steps: (1) Place the greige fabric in a dyeing agent for dyeing. The dyeing agent includes reactive dye, 80 g / L sodium sulfate, and 15 g / L soda ash. First, add sodium sulfate and reactive dye, then raise the temperature to 60°C at 1°C / min, then add soda ash and dye for 20 min. (2) Soap washing treatment: Add soap detergent for washing, wash at 98℃ for 10 minutes, wash twice with soap detergent, then maintain at 80℃ for 10 minutes, then add glacial acetic acid, cool down to 40℃ and maintain for 10 minutes.

[0063] S9, open-width water-pressing; S10, loose drying; S11, China Inspection and Quarantine; S12, Water-repellent finishing and setting; The water-repellent finishing and setting process is as follows: the water is set on a setting machine using a setting agent, the setting temperature is 155℃, and the machine speed is 16m / min; the setting agent contains 50g / L water-repellent agent (polydimethylsiloxane), 80g / L ice-feeling silicone oil and 1g / L penetrant, and the solvent is water.

[0064] S13, Softening and shaping treatment; S14, Post-inspection.

[0065] Example 2: A flame-retardant, antibacterial, and water-repellent elastic fabric, wherein the yarn used in the fabric includes polyvinyl chloride fiber yarn, combed cotton yarn, and spandex elastic fiber yarn; the fabric is woven into a greige fabric using a double-sided circular knitting machine, and the greige fabric is subjected to at least a water-repellent finishing process to obtain the fabric. The combed cotton yarn is used to weave the outer layer of the fabric, the polyvinyl chloride fiber yarn is used to weave the inner layer of the fabric, and the spandex elastic fiber yarn is used to weave the middle connecting layer of the fabric. The combed cotton yarn is 50-count compact spun or compact Siro spun cotton yarn, the polyvinyl chloride fiber yarn is 50-count ring-spun colored yarn, and the spandex elastic fiber yarn has a specification of 30D.

[0066] Furthermore, the needle pitch of the double-sided circular knitting machine is 28G, the cylinder diameter is 34 inches, and the needle arrangement of the double-sided circular knitting machine is that the upper cylinder needles are arranged alternately with size 2 and size 1 needles; the lower cylinder needles are arranged alternately with size 1 and size 2 needles; the weaving method used for the greige fabric is the same as in Example 1.

[0067] Furthermore, the fabric has a weight of 250 g / m². 2 The weight deviation is within 2%, and the dimensional change after washing is controlled within -3.5%.

[0068] The present invention also provides a method for preparing the above-mentioned flame-retardant, antibacterial, water-repellent elastic fabric, comprising the following steps: S1, weaving; S2, Opening and rolling; S3, Prepare the fabric; S4, Pre-formed; The process for the pre-formed part is as follows: pre-formed temperature 195℃, machine speed 20m / min.

[0069] S5, Double-sided singeing; S6. Pretreatment; The pretreatment process is as follows: add 1.5g / L of penetrant, 1.5g / L of refining agent, 2g / L of caustic soda flakes, and 5g / L of hydrogen peroxide, and treat at 95℃ for 35min. After treatment, the core absorption height of the fabric is greater than 15cm / 30min.

[0070] S7. Enzyme washing; The enzyme washing process is as follows: the greige fabric is placed in the enzyme washing solution at a bath ratio of 1:12 and treated at a temperature of 50℃ for 60 minutes; the pH value of the enzyme washing solution is 5, and the dosage is: 1.5g / L neutral enzyme, 0.8g / L sodium acetate and 0.8g / L acetic acid, and the solvent is water.

[0071] S8. Dyeing; The dyeing process includes the following steps: (1) Place the greige fabric in a dyeing agent for dyeing. The dyeing agent includes reactive dye, 80 g / L sodium sulfate, and 15 g / L soda ash. First, add sodium sulfate and reactive dye, then raise the temperature to 60°C at 1.5°C / min, then add soda ash and dye for 20 min. (2) Soap washing treatment: Add soap detergent for washing, wash at 98℃ for 10 minutes, wash twice with soap detergent, then maintain at 80℃ for 10 minutes, then add glacial acetic acid, cool down to 40℃ and maintain for 10 minutes.

[0072] S9, open-width water-pressing; S10, loose drying; S11, China Inspection and Quarantine; S12, Water-repellent finishing and setting; The water-repellent finishing and setting process is as follows: the water is set on a setting machine using a setting agent, the setting temperature is 165℃, and the machine speed is 18m / min; the setting agent contains 80g / L water-repellent agent (polydimethylsiloxane), 120g / L ice-feeling silicone oil, and 1.5g / L penetrant, and the solvent is water.

[0073] S13, Softening and shaping treatment; S14, Post-inspection.

[0074] Example 3: A flame-retardant, antibacterial, and water-repellent elastic fabric, wherein the yarn used in the fabric includes methylene fiber yarn, combed cotton yarn, and spandex elastic fiber yarn; the fabric is woven into a greige fabric using a double-sided circular knitting machine, and the greige fabric is subjected to at least a water-repellent finishing process to obtain the fabric. The combed cotton yarn is used to weave the outer layer of the fabric, the polyvinyl chloride fiber yarn is used to weave the inner layer of the fabric, and the spandex elastic fiber yarn is used to weave the middle connecting layer of the fabric. The combed cotton yarn is 60-count compact spun or compact Siro spun cotton yarn, the polyvinyl chloride fiber yarn is 60-count ring-spun colored yarn, and the spandex elastic fiber yarn has a specification of 40D.

[0075] Furthermore, the needle pitch of the double-sided circular knitting machine is 28G, the cylinder diameter is 34 inches, and the needle arrangement of the double-sided circular knitting machine is that the upper cylinder needles are arranged alternately with size 2 and size 1 needles; the lower cylinder needles are arranged alternately with size 1 and size 2 needles; the weaving method used for the greige fabric is the same as in Example 1.

[0076] Furthermore, the fabric has a weight of 280 g / m². 2 The weight deviation is within 2%, and the dimensional change after washing is controlled within -3.5%.

[0077] The present invention also provides a method for preparing the above-mentioned flame-retardant, antibacterial, water-repellent elastic fabric, comprising the following steps: S1, weaving; S2, Opening and rolling; S3, Prepare the fabric; S4, Pre-formed; The process for the pre-formed part is as follows: pre-formed temperature 195℃, machine speed 20m / min.

[0078] S5, Double-sided singeing; S6. Pretreatment; The pretreatment process is as follows: add 2g / L of penetrant, 2g / L of refining agent, 2.5g / L of caustic soda flakes and 6g / L of hydrogen peroxide, and treat at 100℃ for 40min. After treatment, the core absorption height of the fabric is greater than 15cm / 30min.

[0079] S7. Enzyme washing; The enzyme washing process is as follows: the greige fabric is placed in the enzyme washing solution at a bath ratio of 1:15 and treated at a temperature of 60℃ for 80 minutes; the pH value of the enzyme washing solution is 6.5, and the dosage is: 2g / L neutral enzyme, 1.0g / L sodium acetate and 1.0g / L acetic acid, and the solvent is water.

[0080] S8. Dyeing; The dyeing process includes the following steps: (1) Place the greige fabric in a dyeing agent for dyeing. The dyeing agent includes reactive dye, 80 g / L sodium sulfate, and 15 g / L soda ash. First, add sodium sulfate and reactive dye, then raise the temperature to 60°C at 1.5°C / min, then add soda ash and dye for 20 min. (2) Soap washing treatment: Add soap detergent for washing, wash at 98℃ for 10 minutes, wash twice with soap detergent, then maintain at 80℃ for 10 minutes, then add glacial acetic acid, cool down to 40℃ and maintain for 10 minutes.

[0081] S9, open-width water-pressing; S10, loose drying; S11, China Inspection and Quarantine; S12, Water-repellent finishing and setting; The water-repellent finishing and setting process is as follows: the water is set on a setting machine using a setting agent, the setting temperature is 175℃, and the machine speed is 20m / min; the setting agent contains 100g / L water-repellent agent (polydimethylsiloxane), 150g / L ice-feeling silicone oil and 2g / L penetrant, and the solvent is water.

[0082] S13, Softening and shaping treatment; S14, Post-inspection.

[0083] The fabrics obtained in Examples 1-3 were all subjected to the following functional tests: (1) Antibacterial test: The test method is in accordance with FZ / T73023-2006; The test results of Examples 1-3 were all: after 50 washes with water, the antibacterial rate was >90%, reaching the national AAA-level antibacterial standard; (2) Water Repellency (Spray Test): The test method is in accordance with AATCC TM22-2017e; The test results for Examples 1-3 were all 90% or higher; (3) Flame retardant performance (combustion performance) test: The test method refers to condition A of GB / T 5455-2014; The test results for Examples 1-3 were as follows: before washing / after 50 washes, afterflame time ≤ 2s; smoldering time ≤ 2s; damage length ≤ 50mm; dripping: none; melting: none.

[0084] The fabrics prepared in Examples 1-3 were subjected to routine physicochemical tests, and the results are shown in Table 1 below: Table 1. Test Results of Physicochemical Indicators Index item Reference standard Index requirement Example 1 test result Example 2 test result Example 3 test result Textile fastness to sunlight color GB / T8427 ≥4.0 grade 4 grade 4 grade 4 grade Textile fastness to perspiration color GB / T3922 ≥4.0 grade (color change); ≥3.0 grade (color staining) 4.0 grade (color change); 3-4 grade (color staining) 4.0 grade (color change); 3-4 grade (color staining) 4.0 grade (color change); 3-4 grade (color staining) Textile fastness to water color GB / T5713 ≥3-4.0 grade (color change); ≥3-4.0 grade (color staining) 4-5 grade (color change); 4-5 grade (color staining) 4-5 grade (color change); 4-5 grade (color staining) 4-5 grade (color change); 4-5 grade (color staining) Textile fastness to rubbing color GB / T3920 4.0 grade (dry rubbing); ≥3.0 grade (wet rubbing, dark color 2.0) 4-5 grade (dry rubbing); 3-4 grade (wet rubbing) 4-5 grade (dry rubbing); 3-4 grade (wet rubbing) 4-5 grade (dry rubbing); 3-4 grade (wet rubbing) Textile fastness to washing color GB / T3921A1 ≥4.0 grade 4-5 4-5 4-5 Dimensional stability GB / T8629-5A Straight: + / - 3%; cross: + / - 5% Straight: -0.7%; cross: -0.2% Straight: -0.5%; cross: -0.3% Straight: -0.8%; cross: -0.2% Pilling GB / T4802.1 3.0 3-4 grade 3-4 grade 3-4 grade Bursting strength ISO13938-1 ≥55 PSI 80 PSI 82 PSI 86 PSI Formaldehyde content GB / T2912.1 ≤75 PPM 20 PPM 18 PPM 21 PPM Textile PH value GB / T7573 4.5-6.5 6.2 6.0 5.9 Elasticity test ISO20932-1 Cross straight: 85%, after 1 minute, after 30 minutes 89% 92% 90% As can be seen from the above, the fabric obtained by the present invention has excellent flame retardancy, antibacterial properties, water repellency, excellent elasticity, good shape retention, washability, and durability.

[0085] The above description is only a preferred embodiment of the present invention. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the claims of this patent application are included in the scope of this patent application.

Claims

1. A flame-retardant, antibacterial, water-repellent elastic fabric, characterized in that, The yarns used in the fabric include polyvinyl chloride fiber yarn, combed cotton yarn and spandex elastic fiber yarn; the fabric is woven into a greige fabric using a double-sided circular knitting machine, and the greige fabric is subjected to at least a water-repellent finishing process to obtain the fabric. The combed cotton yarn is used to weave the outer layer of the fabric, the polyvinyl chloride fiber yarn is used to weave the inner layer of the fabric, and the spandex elastic fiber yarn is used to weave the middle connecting layer of the fabric.

2. The flame-retardant, antibacterial, and water-repellent elastic fabric according to claim 1, characterized in that, The combed cotton yarn is 40-60 count compact spun or compact Siro spun cotton yarn, the polyvinyl chloride fiber yarn is 40-60 count ring-spun colored yarn, and the spandex elastic fiber yarn has a specification of 20-40D.

3. The flame-retardant, antibacterial, and water-repellent elastic fabric according to claim 1, characterized in that, The double-sided circular knitting machine uses a needle arrangement where the upper cylinder needles are arranged alternately with size 2 and size 1 needles; the lower cylinder needles are arranged alternately with size 1 and size 2 needles; the greige fabric is woven using the following method: First row: The upper needle plate uses needles 1 and 2 to form circles, and the lower needle cylinder uses needles 1 and 2 to weave floats; the yarn in the first row is the combed cotton yarn, and the outer layer of the greige fabric is woven repeatedly to obtain the outer layer of the greige fabric; Second path: the lower needle cylinder uses needles 1 and 2 to form loops, and the upper needle plate uses needles 1 and 2 to knit floats; the second path yarn uses the aforementioned methylene fiber yarn, and the inner layer of the fabric is woven repeatedly. Third path: the upper needle #2 gathers the loop, the upper needle #1 floats the yarn, the lower needle #2 gathers the loop, and the lower needle #1 floats the yarn; the third path yarn uses the spandex elastic fiber yarn, and the process is repeated to weave the middle connecting layer of the fabric. Fourth row: The upper needle plate uses needles 1 and 2 to form loops, and the lower needle cylinder uses needles 1 and 2 to weave floats; the yarn in the fourth row is made of the combed cotton yarn, and the outer layer of the greige fabric is woven repeatedly. Fifth row: The lower needle cylinder uses needles 1 and 2 to form loops, and the upper needle plate uses needles 1 and 2 to knit floats; the fifth row yarn uses the metal fiber yarn, and is repeatedly woven to obtain the inner layer of the fabric. Sixth row: upper needle #1 gathers the yarn, upper needle #2 floats the yarn, lower needle #1 gathers the yarn, upper needle #2 floats the yarn; the sixth row yarn uses the spandex elastic fiber yarn, and is woven repeatedly to obtain the middle connecting layer of the greige fabric.

4. The flame-retardant, antibacterial, and water-repellent elastic fabric according to claim 1, characterized in that, The fabric has a weight of 200-280 g / m². 2 .

5. A method for preparing a flame-retardant, antibacterial, and water-repellent elastic fabric as described in any one of claims 1-4, characterized in that, The process includes the following steps: weaving, opening and rolling, fabric preparation, pre-sing, double-sided singeing, pre-treatment, enzyme washing, dyeing, opening and water squeezing, loose drying, mid-term inspection, water-repellent finishing and shaping, softening and shaping treatment, and final inspection.

6. The method for preparing the flame-retardant, antibacterial, and water-repellent elastic fabric according to claim 5, characterized in that, The process for the pre-formed model is as follows: pre-formed temperature 195℃, machine speed 20m / min.

7. The method for preparing the flame-retardant, antibacterial, water-repellent elastic fabric according to claim 5, characterized in that, The pretreatment process is as follows: add 1-2 g / L of penetrant, 1-2 g / L of refining agent, 1.5-2.5 g / L of caustic soda flakes, and 4-6 g / L of hydrogen peroxide, and treat at 90-100℃ for 30-40 minutes. After treatment, the core absorption height of the fabric is greater than 15 cm / 30 minutes.

8. The method for preparing the flame-retardant, antibacterial, water-repellent elastic fabric according to claim 5, characterized in that, The enzyme washing process is as follows: the greige fabric is placed in the enzyme washing solution at a bath ratio of 1:10-15 and treated at a temperature of 40-60℃ for 40-80 minutes; the pH value of the enzyme washing solution is 4.5-6.5, and the dosage is: 1-2g / L neutral enzyme, 0.5-1.0g / L sodium acetate and 0.5-1.0g / L acetic acid, and the solvent is water.

9. The method for preparing the flame-retardant, antibacterial, and water-repellent elastic fabric according to claim 5, characterized in that, The dyeing process includes the following steps: (1) Place the greige fabric in a dyeing agent for dyeing. The dyeing agent includes reactive dye, 80 g / L sodium sulfate, and 15 g / L soda ash. First, add sodium sulfate and reactive dye, then raise the temperature to 60°C at 1-1.5°C / min, then add soda ash and dye for 20 min. (2) Soap washing treatment: Add soap detergent for washing, wash at 98℃ for 10 minutes, wash twice with soap detergent, then maintain at 80℃ for 10 minutes, then add glacial acetic acid, cool down to 40℃ and maintain for 10 minutes.

10. The method for preparing the flame-retardant, antibacterial, and water-repellent elastic fabric according to claim 5, characterized in that, The water-repellent finishing process is as follows: the finishing agent is used for finishing on a finishing machine, the finishing temperature is 155-175℃, and the machine speed is 16-20m / min; the finishing agent contains 50-100g / L water-repellent agent, 80-150g / L ice-feeling silicone oil and 1-2g / L penetrant, and the solvent is water.

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