A high-elasticity antibacterial modified woven fabric and its preparation method

Abstract

This invention relates to the field of fabric preparation technology, and discloses a high-elasticity antibacterial modified woven fabric and its preparation method. The preparation method includes: first, mixing epoxy-functionalized graphene, epoxy-modified PBT masterbatch, and polytetrahydrofuran ether diol, followed by melt spinning, stretching, and heat setting to obtain elastic fibers; then, subjecting cotton fibers to carboxylation pretreatment and chitosan quaternary ammonium salt solution antibacterial treatment to obtain antibacterial cotton fibers; subsequently, using the elastic fibers as warp and the antibacterial cotton fibers as weft to weave a grey fabric, followed by relaxation heat setting and stretching finishing to obtain the finished product. This invention effectively solves problems such as poor compatibility between elastic fibers and natural fibers, easy shedding of antibacterial agents, and insufficient functional synergy. The finished product possesses high elasticity and resilience, durable antibacterial properties, a soft touch, and stable structural strength, making it widely applicable and meeting the needs of various fields for high-performance fabrics.

Description

Technical Field

[0001] This invention relates to the field of fabric preparation technology, specifically to a high-elasticity antibacterial modified woven fabric and its preparation method. Background Technology

[0002] Woven fabrics, with their advantages of structural stability, high strength, and good abrasion resistance, are widely used in clothing, home furnishings, medical care, and many other fields. With the upgrading of consumer demand, people have placed higher requirements on the functionality of woven fabrics, making modified woven fabrics with both high elasticity and antibacterial properties a market hotspot. Currently, the industry typically achieves high elasticity by blending elastic fibers such as spandex into the fabric, or by coating the fabric surface with antibacterial agents through finishing processes. However, these traditional methods have significant limitations: elastic fibers have poor compatibility with natural fibers like cotton, and fiber slippage and breakage are prone to occur during weaving, resulting in poor uniformity of fabric elasticity, and significant elasticity loss after long-term use or repeated washing; furthermore, the surface-coated antibacterial agents have weak bonding with the fibers, are easily detached, and are difficult to maintain a long-lasting antibacterial effect, failing to meet the durability requirements of daily use.

[0003] In terms of antibacterial modification technology, existing solutions still face the challenge of balancing antibacterial agent selection with fabric performance. Some antibacterial fabrics use inorganic antibacterial agents such as silver ions and zinc ions, which, while showing significant antibacterial effects, are costly, prone to causing color differences in the fabric, and may pose environmental risks due to heavy metal residues. Other antibacterial fabrics use traditional quaternary ammonium salt organic antibacterial agents, which, while safer, have a narrower antibacterial spectrum and insufficient adsorption capacity to fibers, resulting in a significant decrease in antibacterial rate after multiple washes. Simultaneously, traditional antibacterial treatment processes damage the surface structure of natural fibers, leading to a stiffer fabric feel and reduced breathability. Cotton fibers, in particular, suffer significant losses in tensile strength after treatment with strong acid or alkali modifiers, severely impacting the fabric's durability and lifespan.

[0004] Furthermore, existing manufacturing processes for high-elasticity antibacterial woven fabrics generally suffer from single functionality and poor synergy: prioritizing elasticity often sacrifices antibacterial durability, while emphasizing antibacterial effects neglects fabric softness and elasticity. For example, some solutions blend antibacterial components with elastic fibers through melt spinning, but the antibacterial components are unevenly dispersed within the fibers, affecting both the spinning quality of the elastic fibers and limiting the antibacterial effect to the fiber surface. When using stepwise modification processes, the parameters for elasticity modification and antibacterial modification are difficult to match, easily leading to fabric structural deformation and functional interference. Moreover, traditional processes involve complex production flows and high energy consumption, making them unsuitable for the low-carbon development needs of the modern textile industry. Summary of the Invention

[0005] In view of this, the purpose of this invention is to provide a high-elasticity antibacterial modified woven fabric and its preparation method, which effectively solves the problems of poor compatibility between elastic fibers and natural fibers, easy shedding of antibacterial agents affecting fabric performance, and insufficient process functionality and synergy in existing solutions, thereby achieving a unity of high elasticity, long-lasting antibacterial properties and good performance.

[0006] The objective of this invention can be achieved through the following technical solutions: In a first aspect, the present invention provides a method for preparing a highly elastic antibacterial modified woven fabric, comprising the following preparation steps: S1: Epoxy-functionalized graphene, epoxy-modified PBT masterbatch and polytetrahydrofuran ether diol are mixed, melt-spun, stretched, heat-set and wound to obtain elastic fibers. S2: Cotton fibers are subjected to carboxylation pretreatment and chitosan quaternary ammonium salt solution antibacterial treatment in sequence to obtain antibacterial cotton fibers; S3: Using elastic fibers as warp and antibacterial cotton fibers as weft, weave the fabric to obtain a grey fabric; S4: The greige fabric is subjected to relaxation heat setting and stretching treatment in sequence to obtain a high-elasticity antibacterial modified woven fabric.

[0007] Furthermore, the preparation method of the epoxy-functionalized graphene is as follows: Graphene oxide powder was dispersed in deionized water, epichlorohydrin and tetrabutylammonium bromide were added, and the mixture was heated to 75℃-85℃ and reacted for 4-6 hours. After filtration, washing and drying, epoxy functionalized graphene was obtained. The raw materials in the epoxy functionalized graphene were, by weight, 5-8 parts of graphene oxide powder, 80-100 parts of deionized water, 10-12 parts of epichlorohydrin, and 2-3 parts of tetrabutylammonium bromide.

[0008] Furthermore, the preparation method of the epoxy-modified PBT masterbatch is as follows: Polybutylene terephthalate, glycidyl methacrylate, and dicumyl peroxide were melt-blended in a twin-screw extruder and reactively extruded to obtain epoxy-modified PBT masterbatch.

[0009] Furthermore, the raw materials in the epoxy functionalized graphene are, by weight, 80-90 parts of polybutylene terephthalate, 2-3 parts of glycidyl methacrylate, and 0.5-1 parts of dicumyl peroxide.

[0010] Furthermore, the temperatures of each section of the twin-screw extruder are as follows: feeding section 180℃-190℃, melting section 230℃-240℃, reaction section 245℃-255℃, and die head section 240℃-250℃, and the screw speed is 150r / min-200r / min. Furthermore, the method for preparing the chitosan quaternary ammonium salt solution is as follows: Chitosan was dissolved in an aqueous acetic acid solution by stirring to obtain a chitosan acetic acid solution. Then, 2,3-epoxypropyltrimethylammonium chloride, polyetheramine D230, and amino silicone oil emulsion were added. The temperature was raised to 65℃-75℃ and maintained for 4-6 hours. After the reaction was completed, the solution was cooled to room temperature and the pH was adjusted to 6.5-7.0 to obtain a chitosan quaternary ammonium salt solution. The raw materials, by weight, were: 3-5 parts chitosan, 80-100 parts aqueous acetic acid solution, 8-12 parts 2,3-epoxypropyltrimethylammonium chloride, 2-4 parts polyetheramine D230, and 1-3 parts amino silicone oil emulsion.

[0011] Furthermore, the acetic acid aqueous solution has a mass fraction of 1%-2%.

[0012] Further, in step S1, the raw materials are as follows by weight: 3-5 parts of epoxy functionalized graphene, 70-80 parts of epoxy-modified PBT masterbatch, and 10-18 parts of polytetrahydrofuran ether diol; the melt spinning temperature is 250℃-270℃, and the spinning speed is 800m / min-1000m / min. Furthermore, the stretching is a two-stage stretching process. The first stage has a stretching ratio of 1.8-2.2 times and a stretching temperature of 80℃-90℃, while the second stage has a stretching ratio of 1.5-1.8 times and a stretching temperature of 100℃-110℃. Furthermore, the heat setting temperature is 120℃-140℃, and the time is 30s-45s.

[0013] Further, in step S2, the carboxylation pretreatment is as follows: cotton fibers are added to deionized water, maleic anhydride and potassium persulfate are added, and the mixture is stirred at 80℃-95℃ for 60min-90min to obtain carboxylated pretreated cotton fibers; the raw materials in the carboxylated pretreated cotton fibers are in the following weight parts: cotton fibers 1-1.5 parts, maleic anhydride 5-8 parts, potassium persulfate 0.5-1 parts and deionized water 80-90 parts; The antibacterial treatment is as follows: carboxylated pretreated cotton fibers are immersed in a chitosan quaternary ammonium salt solution and stirred at 50℃-65℃ for 40min-60min. After cooling, the fibers are removed and vacuum dried to obtain antibacterial cotton fibers. The mass ratio of carboxylated pretreated cotton fibers to chitosan quaternary ammonium salt solution is 1:12-18.

[0014] Furthermore, in step S3, the weaving is done using an air-jet loom with the following weaving parameters: warp density 350-400 warp threads / 10cm, weft density 300-350 warp threads / 10cm.

[0015] Furthermore, in step S4, the process conditions for relaxation heat setting are: temperature 110℃-130℃, time 20min-30min, and overfeed rate 3%-5%; the stretching finishing adopts a hot air tenter machine, and the process conditions are: stretching temperature 140℃-160℃, stretching speed 15m / min-20m / min, warp stretching rate 1%-2%, weft stretching rate 3%-5%, and fabric moisture regain controlled at 7%-9%.

[0016] On the other hand, the present invention provides a high-elasticity antibacterial modified woven fabric prepared by the above-mentioned method of preparing high-elasticity antibacterial modified woven fabric.

[0017] The beneficial effects of this invention are: 1. This invention effectively solves the problem of poor compatibility between elastic fibers and natural fibers in traditional elastic fabrics. Through innovative elastic fiber preparation formula and process, a stable bond is formed between different components, which significantly improves the elasticity uniformity and structural stability of the fabric, avoids fiber slippage and breakage during weaving, and ensures that the fabric can maintain good elasticity after long-term use or multiple washes, thus achieving a balance between high elasticity and durability.

[0018] 2. This invention constructs a safe and durable antibacterial system. Through a two-step process of carboxylation pretreatment of cotton fibers and antibacterial treatment with chitosan quaternary ammonium salt solution, the binding force between antibacterial components and fibers is enhanced. This avoids the risk of heavy metal residues from inorganic antibacterial agents and overcomes the shortcomings of traditional organic antibacterial agents, such as narrow antibacterial spectrum and easy shedding. While giving the fabric a strong antibacterial effect, it does not damage the surface structure of natural fibers, thus ensuring the basic performance and safety of the fabric.

[0019] 3. This invention achieves synergistic optimization of multiple fabric properties. By rationally designing warp and weft yarn selection, weaving parameters, and finishing processes, it balances high elasticity, antibacterial properties, soft touch, and structural strength, solving the problems of single functionality and poor synergy in traditional processes. The entire preparation process does not use harmful modifiers, has highly adaptable process parameters, and controllable energy consumption. It meets the production needs of modern textile industry and can widely satisfy the requirements of high-performance fabrics in various fields such as clothing, home furnishings, and medical applications. Detailed Implementation

[0020] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] The amino silicone oil emulsion in the following examples is model 028, purchased from Wesley Chemical Technology (Dongguan) Co., Ltd.

[0022] The graphene oxide powder in the following examples is industrial-grade graphene oxide powder, purchased from Suzhou CarbonFeng Graphene Technology Co., Ltd.

[0023] In the examples below, the polybutylene terephthalate (PET) grade is 3316 EF2001, purchased from Suzhou Xinleda Plastics Co., Ltd.

[0024] Chitosan in the following examples was purchased from Shandong Xinxiong Biotechnology Co., Ltd.

[0025] In the examples below, polyetheramine D230 was purchased from Jinan Shuangying Chemical Co., Ltd.

[0026] In the examples below, polytetrahydrofuran ether diol was purchased from Shandong Deyitai New Materials Co., Ltd.

[0027] Example 1 A method for preparing a high-elasticity antibacterial modified woven fabric includes the following preparation steps: The preparation method of epoxy-functionalized graphene is as follows: Take 5 parts of industrial-grade graphene oxide powder, 80 parts of deionized water, 10 parts of epichlorohydrin and 2 parts of tetrabutylammonium bromide. Disperse the industrial-grade graphene oxide powder in deionized water, add epichlorohydrin and tetrabutylammonium bromide, heat to 75℃ and keep the temperature for 4 hours. After the reaction is completed, filter, wash with anhydrous ethanol, and dry at -0.08MPa vacuum and 50℃ for 8 hours to obtain epoxy-functionalized graphene. The preparation method of epoxy-modified PBT masterbatch is as follows: Take 80 parts of polybutylene terephthalate, 2 parts of glycidyl methacrylate and 0.5 parts of dicumyl peroxide. Put polybutylene terephthalate, glycidyl methacrylate and dicumyl peroxide into a twin-screw extruder. Set the temperature of each section to 180°C, 230°C, 245°C, and 240°C, and the screw speed to 150 r / min. After melt blending and reactive extrusion, epoxy-modified PBT masterbatch is obtained. The preparation method of chitosan quaternary ammonium salt solution is as follows: Take 3 parts of chitosan, 80 parts of 1% acetic acid aqueous solution, 8 parts of 2,3-epoxypropyltrimethylammonium chloride, 2 parts of polyetheramine D230 and 1 part of amino silicone oil emulsion. Add chitosan to 1% acetic acid aqueous solution and stir until completely dissolved to obtain chitosan acetic acid solution. Add 2,3-epoxypropyltrimethylammonium chloride, polyetheramine D230 and amino silicone oil emulsion to it, heat to 65℃ and keep it at the temperature for 4 hours. After the reaction is completed, cool it naturally to room temperature, and adjust the pH value of the system to 6.5 with 1% sodium bicarbonate aqueous solution to obtain chitosan quaternary ammonium salt solution. S1: Preparation of elastic fibers Take 3 parts of epoxy-functionalized graphene, 70 parts of epoxy-modified PBT masterbatch, and 10 parts of polytetrahydrofuran ether glycol. Mix the epoxy-functionalized graphene, epoxy-modified PBT masterbatch, and polytetrahydrofuran ether glycol thoroughly and evenly. Melt spin at 250℃ with a spinning speed of 800m / min. Then, perform two stretching treatments in sequence. The first stretching ratio is 1.8 times and the stretching temperature is 80℃. The second stretching ratio is 1.5 times and the stretching temperature is 100℃. Finally, heat set at 120℃ for 30s. After heat setting, wind and take-up the yarn to obtain elastic fiber. S2: Preparation of antibacterial cotton fibers Take 1 part cotton fiber, 5 parts maleic anhydride, 0.5 parts potassium persulfate, and 80 parts deionized water. Add the cotton fiber to the deionized water, then add maleic anhydride and potassium persulfate. Stir at 80°C for 60 min to obtain carboxylated pretreated cotton fiber. Then, immerse the carboxylated pretreated cotton fiber in a chitosan quaternary ammonium salt solution at a mass ratio of 1:12. Stir at 50°C for 40 min, cool, and then remove. Dry at 60°C and 0.06 MPa vacuum for 2 h to obtain antibacterial cotton fiber. S3: Woven fabric Elastic fibers are used as warp threads and antibacterial cotton fibers are used as weft threads. The fabric is woven using an air-jet loom with a warp density of 350 threads / 10cm and a weft density of 300 threads / 10cm. After weaving, the greige fabric is obtained. S4: Post-processing The greige fabric is first subjected to relaxation heat setting at 110℃ for 20 minutes with an overfeed rate of 3%. Then, a hot air tenter is used for stretching and finishing, with the process conditions set as follows: stretching temperature 140℃, stretching speed 15m / min, warp stretching rate 1%, and weft stretching rate 3%. After finishing, the fabric moisture regain rate is controlled at 7%, and finally, a high-elasticity antibacterial modified woven fabric is obtained.

[0028] Example 2 A method for preparing a high-elasticity antibacterial modified woven fabric includes the following preparation steps: The preparation method of epoxy-functionalized graphene is as follows: Take 6.5 parts of industrial-grade graphene oxide powder, 90 parts of deionized water, 11 parts of epichlorohydrin and 2.5 parts of tetrabutylammonium bromide. Disperse the industrial-grade graphene oxide powder in deionized water, add epichlorohydrin and tetrabutylammonium bromide, heat to 80℃ and keep the temperature for 5 hours. After the reaction is completed, wash with anhydrous ethanol and dry at -0.09MPa vacuum and 60℃ for 7 hours to obtain epoxy-functionalized graphene. The preparation method of epoxy-modified PBT masterbatch is as follows: 85 parts of polybutylene terephthalate, 2.5 parts of glycidyl methacrylate and 0.8 parts of dicumyl peroxide are fed into a twin-screw extruder. The temperature of each section is set at 185°C for the feeding section, 235°C for the melting section, 250°C for the reaction section and 245°C for the die head section, and the screw speed is 175 r / min. After melt blending and reactive extrusion, epoxy-modified PBT masterbatch is obtained. Preparation of chitosan quaternary ammonium salt solution: Take 4 parts chitosan, 90 parts of 1.5% acetic acid aqueous solution, 10 parts 2,3-epoxypropyltrimethylammonium chloride, 3 parts polyetheramine D230 and 2 parts amino silicone oil emulsion. Add chitosan to 1.5% acetic acid aqueous solution and stir until completely dissolved to obtain chitosan acetic acid solution. Add 2,3-epoxypropyltrimethylammonium chloride, polyetheramine D230 and amino silicone oil emulsion to it, heat to 70℃ and keep the temperature for 5 hours. After the reaction is completed, cool naturally to room temperature, and adjust the pH of the system to 6.8 with 1.5% sodium bicarbonate aqueous solution to obtain chitosan quaternary ammonium salt solution. S1: Preparation of elastic fibers Four parts of epoxy-functionalized graphene, 75 parts of epoxy-modified PBT masterbatch, and 14 parts of polytetrahydrofuran ether glycol were taken and thoroughly mixed. The mixture was melt-spun at 260℃ with a spinning speed of 900 m / min. Then, two stretching treatments were performed in sequence: the first stretching ratio was 2.0 times and the stretching temperature was 85℃, and the second stretching ratio was 1.65 times and the stretching temperature was 105℃. Finally, the mixture was heat-set at 130℃ for 38 seconds. After heat setting, the fibers were wound up to obtain elastic fibers. S2: Preparation of antibacterial cotton fibers Take 1.2 parts of cotton fiber, 7 parts of maleic anhydride, 0.8 parts of potassium persulfate, and 85 parts of deionized water. Add the cotton fiber to the deionized water, then add maleic anhydride and potassium persulfate. Stir at 87°C for 75 min to obtain carboxylated pretreated cotton fiber. Then, immerse the carboxylated pretreated cotton fiber in a chitosan quaternary ammonium salt solution at a mass ratio of 1:15. Stir at 58°C for 50 min, cool, remove, and dry at 68°C and 0.07 MPa vacuum for 2.5 h to obtain antibacterial cotton fiber. S3: Woven fabric Elastic fibers are used as warp threads and antibacterial cotton fibers are used as weft threads. The fabric is woven using an air-jet loom with a warp density of 375 threads / 10cm and a weft density of 325 threads / 10cm. After weaving, the greige fabric is obtained. S4: Post-processing The greige fabric is first subjected to relaxation heat setting at 120℃ for 25 minutes with an overfeed rate of 4%. Then, a hot air tenter is used for stretching and finishing, with the process conditions set as follows: stretching temperature 150℃, stretching speed 18m / min, warp stretching rate 1.5%, and weft stretching rate 4%. After finishing, the fabric moisture regain rate is controlled at 8%, resulting in a high-elasticity antibacterial modified woven fabric.

[0029] Example 3 A method for preparing a high-elasticity antibacterial modified woven fabric includes the following preparation steps: Preparation of epoxy-functionalized graphene: Take 8 parts of industrial-grade graphene oxide powder, 100 parts of deionized water, 12 parts of epichlorohydrin and 3 parts of tetrabutylammonium bromide. Disperse the industrial-grade graphene oxide powder in deionized water, add epichlorohydrin and tetrabutylammonium bromide, heat to 85℃ and keep the temperature for 6 hours. After the reaction is completed, wash with anhydrous ethanol and dry at -0.10MPa vacuum and 70℃ for 8 hours to obtain epoxy-functionalized graphene. Preparation of epoxy-modified PBT masterbatch: Take 90 parts of polybutylene terephthalate, 3 parts of glycidyl methacrylate and 1 part of dicumyl peroxide. Put the polybutylene terephthalate, glycidyl methacrylate and dicumyl peroxide into a twin-screw extruder. Set the temperature of each section to 190°C, 240°C, 255°C, and 250°C, and the screw speed to 200 r / min. After melt blending and reactive extrusion, epoxy-modified PBT masterbatch is obtained. Preparation of chitosan quaternary ammonium salt solution: Take 5 parts chitosan, 100 parts of 2% acetic acid aqueous solution, 12 parts 2,3-epoxypropyltrimethylammonium chloride, 4 parts polyetheramine D230 and 3 parts amino silicone oil emulsion. Add chitosan to 2% acetic acid aqueous solution and stir until completely dissolved to obtain chitosan acetic acid solution. Add 2,3-epoxypropyltrimethylammonium chloride, polyetheramine D230 and amino silicone oil emulsion to it, heat to 75℃ and keep the temperature for 6 hours. After the reaction is completed, cool naturally to room temperature, and adjust the pH of the system to 7.0 with 2% sodium bicarbonate aqueous solution to obtain chitosan quaternary ammonium salt solution. S1: Preparation of elastic fibers Take 5 parts of epoxy-functionalized graphene, 80 parts of epoxy-modified PBT masterbatch, and 18 parts of polytetrahydrofuran ether glycol. Mix the epoxy-functionalized graphene, epoxy-modified PBT masterbatch, and polytetrahydrofuran ether glycol thoroughly and evenly. Melt spin at 270℃ with a spinning speed of 1000 m / min. Then, perform two stretching treatments in sequence. The first stretching ratio is 2.2 times and the stretching temperature is 90℃. The second stretching ratio is 1.8 times and the stretching temperature is 110℃. Finally, heat set at 140℃ for 45s. After heat setting, wind and take-up the yarn to obtain elastic fiber. S2: Preparation of antibacterial cotton fibers Take 1.5 parts of cotton fiber, 8 parts of maleic anhydride, 1 part of potassium persulfate, and 90 parts of deionized water. Add the cotton fiber to the deionized water, then add maleic anhydride and potassium persulfate. Stir at 95°C for 90 min to obtain carboxylated pretreated cotton fiber. Then, immerse the carboxylated pretreated cotton fiber in a chitosan quaternary ammonium salt solution at a mass ratio of 1:18. Stir at 65°C for 60 min, cool, and then remove. Dry at 75°C and 0.08 MPa vacuum for 3 h to obtain antibacterial cotton fiber. S3: Woven fabric Elastic fibers are used as warp threads and antibacterial cotton fibers are used as weft threads. The fabric is woven on an air-jet loom with a warp density of 400 threads / 10cm and a weft density of 350 threads / 10cm. After weaving, the greige fabric is obtained. S4: Post-processing The greige fabric is first subjected to relaxation heat setting at 130℃ for 30 minutes with an overfeed rate of 5%. Then, a hot air tenter is used for stretching and finishing, with the process conditions set as follows: stretching temperature 160℃, stretching speed 20m / min, warp stretching rate 2%, and weft stretching rate 5%. After finishing, the fabric moisture regain rate is controlled at 9%, resulting in a high-elasticity antibacterial modified woven fabric.

[0030] Comparative Example 1 Compared with Example 1, this comparative example replaces "epoxy functionalized graphene" with an equal mass of "industrial-grade graphene oxide powder". All other steps and parameters are the same, and will not be repeated in this comparative example. The final result is a high-elasticity antibacterial modified woven fabric.

[0031] Comparative Example 2 Compared with Example 1, this comparative example replaces "epoxy-modified PBT masterbatch" with an equal mass of "PBT masterbatch". All other steps and parameters are the same, and will not be repeated in this comparative example. The final result is a high-elasticity antibacterial modified woven fabric.

[0032] The preparation method of PBT masterbatch is as follows: Polybutylene terephthalate is fed into a twin-screw extruder, and the temperature of each section is set at 180°C for the feeding section, 230°C for the melting section, 245°C for the reaction section, and 240°C for the die head section, and the screw speed is 150 r / min. After melt blending and reactive extrusion, PBT masterbatch is obtained.

[0033] Comparative Example 3 Compared with Example 1, this comparative example replaces "amino silicone oil emulsion" with an equal mass of "deionized water". All other steps and parameters are the same, and will not be repeated here. The final result is a high-elasticity antibacterial modified woven fabric.

[0034] Comparative Example 4 Compared with Example 1, this comparative example replaces "antibacterial cotton fiber" with an equal mass of "cotton fiber". All other steps and parameters are the same, and will not be repeated in this comparative example. The final result is a high-elasticity antibacterial modified woven fabric.

[0035] Comparative Example 5 Compared with Example 1, this comparative example replaces "antibacterial cotton fiber" with an equal mass of "carboxylated pretreated cotton fiber". All other steps and parameters are the same, and will not be repeated in this comparative example. The final result is a high-elasticity antibacterial modified woven fabric.

[0036] The performance of the high-elasticity antibacterial modified woven fabrics prepared in Examples 1-3 and Comparative Examples 1-5 was tested, and the results are recorded in Table 1.

[0037] 1. Elongation at break test: Referring to GB / T 3923.1-2013, fabric samples prepared in Examples 1-3 and Comparative Examples 1-5 were cut into strips of 20cm × 5cm and equilibrated for 24 hours in a standard environment of constant temperature 23℃ and relative humidity 65%. An electronic fabric tensile testing machine was used, with a clamping distance of 10cm and a tensile speed of 100mm / min. Tensile tests were performed on the warp and weft directions of the samples, and the actual elongation at break was recorded. The elongation at break was calculated using the formula: Where L0 is the initial clamping length of the sample (cm) and L1 is the total length of the sample when it breaks (cm).

[0038] 2. Elastic recovery rate test: Referring to GB / T 29865-2013, the constant elongation method is used. A 20cm × 5cm strip sample after equilibrium is taken and stretched to a constant elongation of 20% on an electronic fabric tensile testing machine. This state is maintained for 30 seconds, then unloaded. After resting for 60 seconds, the length of the recovered sample is measured. The elastic recovery rate is calculated using the formula: Where R is the elastic recovery rate (%), L0 is the initial length of the sample (cm), L2 is the length at constant elongation (cm), and L1 is the length after recovery (cm). The warp and weft indices were tested respectively.

[0039] 3. Antibacterial and bacteriostatic rate test: The antibacterial performance was tested according to GB / T 20944.2-2007, using Staphylococcus aureus (ATCC 6538) as the test strain. Fabrics prepared in Examples 1-3 and Comparative Examples 1-5 were cut into 4cm × 4cm samples, sterilized, and then completely immersed in 50mL of a solution containing 1×10⁻⁶ micrograms of water. 6 The sample group was obtained by culturing Staphylococcus aureus bacterial suspension at 37℃ and 90% relative humidity for 24 h in a cfu / mL solution. A control group was also established, consisting of bacterial suspension not in contact with the sample. After culturing, the viable bacterial count (cfu / mL) of both the control group (C0) and the sample group (C1) was measured, and the inhibition rate was calculated using the formula: , where I represents the antibacterial rate (%).

[0040] 4. Bending stiffness test: Referring to GB / T 18318.1-2009, the fabrics prepared in Examples 1-3 and Comparative Examples 1-5 were cut into 20cm × 2cm samples and equilibrated for 24 hours under standard conditions (23℃, 65%RH). The samples were placed along their length on an inclined plane tester with an inclination angle of 15°, and the bending length L (cm) of the sample during free fall was recorded. The bending stiffness was calculated using the formula: Where B is the bending stiffness (mN·m), m is the mass per unit length of the sample (g / m), and g is the acceleration due to gravity (9.8 m / s²). 2 ), d is the sample thickness (m), and the warp and weft directions are tested separately. The smaller the bending stiffness, the better the fabric's softness.

[0041] 5. Breaking strength test: Referring to GB / T 3923.1-2013, 20cm×5cm strips from the same batch as those used in the breaking elongation test were used. Under the same standard environment and electronic fabric strength tester parameters (clamping distance 10cm, tensile speed 100mm / min), the warp and weft samples were stretched. The maximum tensile force at the point of breakage was recorded as the breaking strength (N). Five parallel tests were performed and the average value was taken.

[0042] Table 1. Experimental test data of high-elasticity antibacterial modified woven fabric The high-elasticity antibacterial modified woven fabrics prepared in Examples 1-3 have excellent comprehensive performance. They not only have good elasticity and can quickly recover their original shape after stretching, but also have significant antibacterial effects and strong inhibitory effects on common pathogens. At the same time, the fabric is soft and comfortable to the touch, and has sufficient structural strength to meet the wear resistance and tensile strength requirements of daily use. All performance indicators are coordinated with each other, showing balanced and excellent performance characteristics.

[0043] A comparison of Example 1 and Comparative Example 1 shows that the fabric prepared using epoxy functionalized graphene is superior to the fabric prepared using unmodified graphene oxide powder in terms of elasticity and mechanical strength. This is because the modification treatment of graphene oxide powder improves the compatibility and dispersion uniformity between its components, resulting in a more regular internal structure of the elastic fibers. This enhances the overall elasticity and structural stability of the fabric, allowing it to better recover its shape after being stretched, and also improves its resistance to breakage.

[0044] A comparison of Example 1 and Comparative Example 2 shows that the fabric prepared using epoxy-modified PBT masterbatch exhibits significantly better elasticity and mechanical properties than the fabric prepared using ordinary PBT masterbatch. Epoxy modification enhances the chemical activity of the PBT masterbatch, enabling it to interact more effectively with epoxy-functionalized graphene, polytetrahydrofuran ether glycol, and other raw materials, forming a more structurally stable blend system. This blend system can better exert a synergistic effect during melt spinning, improving the elasticity and strength of the elastic fibers, thereby resulting in a fabric with superior elastic recovery and tear resistance.

[0045] A comparison of Example 1 and Comparative Example 3 shows that the fabric prepared with the addition of amino silicone oil emulsion is superior to the fabric prepared without this component in terms of softness. Amino silicone oil emulsion can form a lubricating film on the fiber surface, reducing the coefficient of friction between fibers and making the fabric feel softer and smoother. Furthermore, it has a synergistic effect with components such as chitosan quaternary ammonium salt, optimizing fabric softness without significantly negatively impacting the fabric's antibacterial properties and mechanical strength. Without this component, inter-fiber friction increases, fabric softness decreases, and the overall feel of the fabric deteriorates.

[0046] A comparison of Example 1 and Comparative Example 4 shows that the fabric prepared from cotton fibers pretreated with carboxylation and treated with chitosan quaternary ammonium salt solution exhibits superior antibacterial properties and overall mechanical properties compared to the fabric prepared from untreated cotton fibers. Carboxylation pretreatment improves the surface structure of cotton fibers and enhances their binding ability with antibacterial agents, while chitosan quaternary ammonium salt solution treatment imparts strong antibacterial properties to the cotton fibers. These two treatments also improve the compatibility of the interweaving of cotton fibers with elastic fibers, resulting in a tighter fabric structure. This ensures excellent antibacterial effects while maintaining good elasticity and tensile strength. Untreated cotton fibers cannot provide antibacterial effects and are difficult to form a stable interweaving structure with elastic fibers, leading to poor fabric performance.

[0047] A comparison of Example 1 and Comparative Example 5 shows that the fabric prepared from cotton fibers that underwent carboxylation pretreatment but not chitosan quaternary ammonium salt solution antibacterial treatment exhibits significantly lower antibacterial properties than the fabric prepared through both treatments. Carboxylation pretreatment primarily aims to improve the surface activity of cotton fibers, creating conditions for subsequent antibacterial agent adhesion, but it does not inherently possess a significant antibacterial effect. Only by combining carboxylation pretreatment with chitosan quaternary ammonium salt solution antibacterial treatment can the cotton fibers truly acquire long-lasting and effective antibacterial capabilities. Furthermore, the synergistic effect of the two treatments allows the fabric to maintain good elasticity and mechanical properties while remaining antibacterial. Carboxylation pretreatment alone cannot achieve the required antibacterial function, and the overall performance is also affected to some extent.

[0048] The above description is merely an example and illustration of the concept of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described or use similar methods to replace them, as long as they do not deviate from the concept of the invention or exceed the scope defined in the claims, they should all fall within the protection scope of the present invention.

Claims

1. A method for preparing a high-elasticity antibacterial modified woven fabric, characterized in that, Includes the following steps: S1: Epoxy-functionalized graphene, epoxy-modified PBT masterbatch and polytetrahydrofuran ether diol are mixed and then melt-spun, stretched, heat-set and wound to obtain elastic fibers. S2: Cotton fibers are subjected to carboxylation pretreatment and chitosan quaternary ammonium salt solution antibacterial treatment in sequence to obtain antibacterial cotton fibers; S3: Elastic fibers are used as warp and antibacterial cotton fibers are used as weft to weave fabric and obtain greige fabric; S4: The greige fabric is subjected to relaxation heat setting and stretching treatment in sequence to obtain a high-elasticity antibacterial modified woven fabric. The preparation method of the epoxy functionalized graphene is as follows: Graphene oxide powder was dispersed in deionized water, epichlorohydrin and tetrabutylammonium bromide were added, and the mixture was heated to 75℃-85℃ and reacted for 4-6 hours. After filtration, washing and drying, epoxy functionalized graphene was obtained. The raw materials in the epoxy functionalized graphene were as follows by weight: 5-8 parts graphene oxide powder, 80-100 parts deionized water, 10-12 parts epichlorohydrin, and 2-3 parts tetrabutylammonium bromide. The preparation method of the epoxy-modified PBT masterbatch is as follows: Polybutylene terephthalate, glycidyl methacrylate, and dicumyl peroxide are melt-blended in a twin-screw extruder and reactively extruded to obtain epoxy-modified PBT masterbatch. The raw materials in the epoxy-modified PBT masterbatch are, by weight, 80-90 parts of polybutylene terephthalate, 2-3 parts of glycidyl methacrylate, and 0.5-1 parts of dicumyl peroxide.

2. The method for preparing the high-elasticity antibacterial modified woven fabric according to claim 1, characterized in that, The preparation method of the chitosan quaternary ammonium salt solution is as follows: Chitosan was dissolved in an aqueous acetic acid solution by stirring to obtain a chitosan acetic acid solution. Then, 2,3-epoxypropyltrimethylammonium chloride, polyetheramine D230, and amino silicone oil emulsion were added. The temperature was raised to 65℃-75℃ and the reaction was maintained for 4-6 hours. After the reaction was completed, the solution was cooled to room temperature and the pH was adjusted to 6.5-7.0 to obtain a chitosan quaternary ammonium salt solution. The raw materials, by weight, were: 3-5 parts chitosan, 80-100 parts aqueous acetic acid solution, 8-12 parts 2,3-epoxypropyltrimethylammonium chloride, 2-4 parts polyetheramine D230, and 1-3 parts amino silicone oil emulsion.

3. The method for preparing the high-elasticity antibacterial modified woven fabric according to claim 1, characterized in that, In step S1, the raw materials are as follows by weight: 3-5 parts of epoxy functionalized graphene, 70-80 parts of epoxy-modified PBT masterbatch, and 10-18 parts of polytetrahydrofuran ether diol; the melt spinning temperature is 250℃-270℃, and the spinning speed is 800m / min-1000m / min; the heat setting temperature is 120℃-140℃, and the time is 30s-45s.

4. The method for preparing the high-elasticity antibacterial modified woven fabric according to claim 1, characterized in that, In step S2, the carboxylation pretreatment is as follows: cotton fibers are added to deionized water, maleic anhydride and potassium persulfate are added, and the mixture is stirred at 80℃-95℃ for 60min-90min to obtain carboxylated pretreated cotton fibers; the raw materials in the carboxylated pretreated cotton fibers are in the following proportions by weight: 1-1.5 parts cotton fibers, 5-8 parts maleic anhydride, 0.5-1 parts potassium persulfate and 80-90 parts deionized water; The antibacterial treatment is as follows: carboxylated pretreated cotton fibers are immersed in a chitosan quaternary ammonium salt solution and stirred at 50℃-65℃ for 40min-60min. After cooling, the fibers are removed and vacuum dried to obtain antibacterial cotton fibers. The mass ratio of carboxylated pretreated cotton fibers to chitosan quaternary ammonium salt solution is 1:12-18.

5. The method for preparing the high-elasticity antibacterial modified woven fabric according to claim 1, characterized in that, In step S3, the weaving is done using an air-jet loom with the following weaving parameters: warp density 350-400 warp threads / 10cm, weft density 300-350 warp threads / 10cm.

6. The method for preparing the high-elasticity antibacterial modified woven fabric according to claim 1, characterized in that, In step S4, the process conditions for relaxation heat setting are: temperature 110℃-130℃, time 20min-30min, and overfeed rate 3%-5%. The stretching and finishing process uses a hot air tenter machine with the following process conditions: stretching temperature 140℃-160℃, stretching speed 15m / min-20m / min, warp stretching rate 1%-2%, weft stretching rate 3%-5%, and fabric moisture regain rate controlled at 7%-9%.

7. A high-elasticity antibacterial modified woven fabric prepared by the method of any one of claims 1-6.

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