Moisture-absorption quick-dry antibacterial composite fabric containing bamboo fibers and preparation process thereof

Abstract

The invention provides a moisture-absorbing, quick-drying and antibacterial composite fabric containing bamboo fibers and a preparation process thereof, and belongs to the technical field of fabrics. Comprising an inner-layer fabric, a core-layer fabric and an outer-layer fabric. The preparation method comprises the following steps: mixing methacrylic acid 2-morpholinyl ethyl ester with bromododecane, carrying out nucleophilic substitution reaction to generate an antibacterial modifier, dissolving the antibacterial modifier in an ethanol solution, soaking the plasma activated polypropylene fiber fabric, and drying to obtain the antibacterial polypropylene fiber fabric. The preparation method comprises the following steps: preparing an antibacterial modifier, initiating a free radical polymerization reaction between the antibacterial modifier and the polypropylene fiber fabric by utilizing potassium persulfate, so that the antibacterial modifier is connected to the surface of the polypropylene fiber fabric, and meanwhile, forming a three-dimensional network through cross-linking of a cross-linking agent N, N '-methylene bisacrylamide, so that the polypropylene fiber has a long-acting antibacterial effect; furthermore, the prepared inner-layer fabric is helpful for inhibiting bacteria from being bred by sweat and reducing peculiar smell.

Description

Technical Field

[0001] The present invention relates to the technical field of fabrics, and in particular to a moisture-absorbing, quick-drying, antibacterial composite fabric containing bamboo fiber and a preparation process thereof. Background Art

[0002] Composite fabric is a multi-layer composite material made by bonding and pasting multiple layers of textile materials, functional materials, etc. Conventional fabrics usually do not have antibacterial properties, and their surfaces easily adsorb bacteria, causing fabric pollution and fiber damage. Bamboo fiber contains active ingredients such as bamboo quinone, which has certain antibacterial effects and also has good moisture absorption and moisture dissipation effects. Blending it with conventional fibers can make the fabric have certain antibacterial and moisture absorption and moisture conduction properties.

[0003] Cotton fabric is a commonly used skin-friendly inner fabric. It has good hydrophilicity and can quickly absorb sweat produced by the human body. However, cotton fibers swell after being wetted, and have poor water evaporation and moisture dissipation capabilities, which prevents moisture from quickly diffusing to the outer surface of the fabric, hindering the quick-drying effect of the fabric and causing the fabric to stick to the skin. Polypropylene fiber has almost zero hygroscopicity, but has extremely strong water conductivity. It can replace cotton fabric as a raw material for preparing close-fitting fabrics for sportswear. It can quickly drain sweat and does not stick to the skin. However, polypropylene fiber fabrics do not have antibacterial function. Contamination by human sweat, sebum secretions and dandruff can cause problems such as mildew growth and odor, greatly affecting the comfort of wearing.

[0004] Polyester fiber can be used in sportswear as the outer wear-resistant material due to its high strength, good elasticity and wear resistance. However, due to the lack of hydrophilic groups, its moisture absorption performance is poor, so sweat cannot be absorbed in time, which easily creates a stuffy feeling and is not conducive to the moisture absorption, perspiration and quick drying of sportswear.

[0005] Therefore, it is necessary to propose a moisture-absorbing, quick-drying, antibacterial composite fabric containing bamboo fiber and a preparation process thereof to improve the wearing comfort of sportswear. Summary of the Invention

[0006] In view of the shortcomings of the prior art, the object of the present invention is to provide a moisture-absorbing, quick-drying, antibacterial composite fabric containing bamboo fiber and a preparation process thereof.

[0007] A moisture-absorbing, quick-drying, antibacterial composite fabric containing bamboo fiber, comprising an inner layer fabric, a core layer fabric, and an outer layer fabric; Among them, the core layer fabric is a blend of pretreated bamboo fiber and polypropylene fiber, and the outer layer fabric is a blend of pretreated bamboo fiber and reinforced hydrophilic modified polyester fiber.

[0008] A preparation process of a moisture-absorbing, quick-drying, antibacterial composite fabric containing bamboo fiber, characterized by comprising the following steps: S1: Preparation of inner fabric An antibacterial modifier is prepared by mixing 2-morpholinoethyl methacrylate and dodecane bromide, which is then dissolved in an ethanol solution and impregnated into pretreated polypropylene fiber fabric. Potassium persulfate and N,N'-methylenebisacrylamide are then added for reaction to obtain an inner layer fabric. S2: Reinforced hydrophilic modified polyester fiber Tetramethylammonium chloride and citric acid are mixed to prepare a transparent homogeneous liquid, which is then immersed in the pretreated polyester fiber for treatment, and then strengthened with a polyacrylic acid solution to obtain a strengthened hydrophilic modified polyester fiber; S3: Preparation of outer fabric and core fabric The bamboo fibers are pretreated, and then the pretreated bamboo fibers are blended with the aforementioned reinforced hydrophilic modified polyester fibers to obtain an outer layer fabric, and the pretreated bamboo fibers are blended with polypropylene fibers to obtain a core layer fabric; S4: Bonding The inner layer fabric, the core layer fabric and the outer layer fabric are bonded together to obtain a moisture-absorbing, quick-drying and antibacterial composite fabric.

[0009] Furthermore, S1 specifically includes the following steps: S1.1: Soak the polypropylene fiber fabric in a 5% sodium hydroxide solution at 50-60°C for 20-30 minutes, then wash with deionized water until neutral and dry, then treat with a plasma treatment apparatus for 2-3 minutes for surface activation to obtain a pretreated polypropylene fiber fabric. S1.2: Add 2-morpholinoethyl methacrylate to anhydrous ethanol in a mass ratio of 1:(4-6), stir thoroughly, add hydroquinone, and heat at 50-60°C for 10-20 minutes. Then, add dodecane bromide dropwise, heat at 80-90°C with stirring for 6-8 hours, and precipitate the unreacted product with acetone by rotary evaporation, filter, and vacuum dry to obtain an antibacterial modifier. S1.3: Add the above antibacterial modifier to 25% ethanol solution at a solid-liquid ratio of 1g:(20-30)mL, stir thoroughly to dissolve, then add the above pretreated polypropylene fiber fabric at a bath ratio of 1:(20-25), after fully immersing, add potassium persulfate and N,N'-methylenebisacrylamide, and heat and stir at 60-80℃ under nitrogen protection for 2-4h. Take out, squeeze out excess liquid and vacuum dry to obtain the inner layer fabric.

[0010] Furthermore, S2 specifically includes the following steps: S2.1: Immerse the polyester fiber in an aqueous solution containing 1% sodium hydroxide and 0.5% sodium lauryl sulfate at 70-80°C for 20-30 minutes, then wash with deionized water until neutral and dry to obtain a pretreated polyester fiber; S2.2: Mix tetramethylammonium chloride and citric acid in a molar ratio of 1:(1-2) and stir at 70-80°C for 40-50 min to obtain a transparent homogeneous liquid; S2.3: Immerse the pretreated polyester fiber in the transparent homogeneous liquid at a bath ratio of 1:(20-30) and stir at 70-80°C for 90-120 minutes. After removal, soak in -10°C ice ethanol for 3-5 minutes, and then ultrasonically clean with ethanol and deionized water for 10-20 minutes to obtain a hydrophilically modified polyester fiber. S2.4: Immerse the above hydrophilic modified polyester fiber in a 0.5% polyacrylic acid solution, heat it at 40-50°C for 30-40 minutes, take it out, and then heat cure it at 110-120°C for 10-20 minutes to obtain a reinforced hydrophilic modified polyester fiber.

[0011] Furthermore, S3 specifically includes the following steps: S3.1: Soaking bamboo fibers in an aqueous solution containing cellulase and xylanase at a bath ratio of 1:(20-30) at 40-50°C for 2-3 hours, removing the fibers and then immersing them in a 5% glycerol solution at 50-60°C for 20-30 minutes to obtain pretreated bamboo fibers; S3.2: Blending the pretreated bamboo fiber with the reinforced hydrophilic modified polyester fiber obtained in step S2.4 at a mass ratio of 1:(2-3) to obtain an outer layer fabric; S3.3: Blending the pretreated bamboo fiber and polypropylene fiber in a mass ratio of 1:(2-3) to obtain a core layer fabric.

[0012] Furthermore, the amount of hydroquinone added is 0.2-0.3% of the mass of 2-morpholinylethyl methacrylate.

[0013] Furthermore, the molar ratio of dodecane bromide to 2-morpholinoethyl methacrylate is 1:1.

[0014] Furthermore, the amount of potassium persulfate added is 0.3-0.5 wt %.

[0015] Furthermore, the added amount of N,N'-methylenebisacrylamide is 0.06-0.08 wt%.

[0016] Furthermore, the amount of cellulase added is 2-3% of the mass of the bamboo fiber, and the amount of xylanase added is 1-2% of the mass of the bamboo fiber.

[0017] Compared with the prior art, the present invention has at least the following beneficial effects: 1. In the present invention, the surface oil and oligomers of the polypropylene fiber fabric are first removed by alkaline hydrolysis, and the specific surface area is increased by slight etching. Then, active groups are generated on the surface by plasma treatment. Then, 2-morpholinoethyl methacrylate and dodecane bromide are mixed to undergo a nucleophilic substitution reaction to generate an antibacterial modifier. After the antibacterial modifier is dissolved in an ethanol solution, the plasma-activated polypropylene fiber fabric is immersed, and potassium persulfate is used to initiate a free radical polymerization reaction between the antibacterial modifier and the polypropylene fiber fabric, thereby connecting the antibacterial modifier to the surface of the polypropylene fiber fabric. At the same time, a three-dimensional network is formed by cross-linking with a crosslinking agent, N,N'-methylenebisacrylamide, so that the polypropylene fiber has a long-lasting antibacterial effect, which helps the composite fabric inhibit the growth of bacteria in sweat and reduce odor.

[0018] 2. In the present invention, tetramethylammonium chloride is mixed with citric acid, and tetramethylammonium chloride acts as a hydrogen bond acceptor and combines with the carboxyl group of citric acid through hydrogen bonds to form a stable solvent system. The pretreated polyester fiber is then immersed in the solvent system, so that the carboxylic acid groups in the solvent system are adsorbed to the surface of the polyester fiber through hydrogen bonds and van der Waals forces to form a hydrophilic layer, thereby effectively improving the hydrophilicity of the polyester fiber and facilitating the improvement of the moisture absorption and quick-drying effect of the composite fabric. The polyester fiber is then immersed in a polyacrylic acid solution, so that the polyacrylic acid combines with the polyester fiber through hydrogen bonds to form a cross-linked network, thereby helping to improve the washability of the composite fabric.

[0019] 3. In the present invention, pretreated bamboo fiber and polypropylene fiber are blended into a core layer fabric, which is then bonded to the outer layer fabric and the inner layer fabric. Since the hydrophilicity of the core layer fabric is between that of the inner layer fabric and the outer layer fabric, the core layer fabric first absorbs moisture through hydrogen bonding and then transfers it to the outer layer with the help of the pores between the fibers. The highly hydrophilic porous structure of the outer layer fabric quickly absorbs and spreads moisture, accelerates evaporation, and prevents reverse infiltration of moisture, thereby further improving the moisture absorption and quick-drying performance of the composite fabric and keeping the inner layer relatively dry. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings, which are incorporated herein and constitute a part of the specification, illustrate embodiments of the present disclosure and, together with the description, further serve to explain the principles of the present disclosure and to enable one skilled in the relevant art to make and use the present disclosure.

[0021] Figure 1 This is a flow chart of the preparation process of the moisture-absorbing, quick-drying, antibacterial composite fabric containing bamboo fiber used in an embodiment of the present invention. DETAILED DESCRIPTION

[0022] The moisture-absorbing, quick-drying, antibacterial composite fabric containing bamboo fiber and its preparation process provided by the present invention are described in detail below with reference to the accompanying drawings and specific embodiments.

[0023] Example 1 A preparation process of a moisture-absorbing, quick-drying, antibacterial composite fabric containing bamboo fiber, such as Figure 1 As shown, the following steps are included: S1: Preparation of inner fabric S1.1: Soak the polypropylene fiber fabric in a 5% sodium hydroxide solution at 50°C for 20 minutes, then wash with deionized water until neutral and dry. Activate the surface of the fabric by treating it with a plasma treatment apparatus for 2 minutes to obtain a pretreated polypropylene fiber fabric. S1.2: 2-Morpholinylethyl methacrylate was added to anhydrous ethanol in a mass ratio of 1:4, and the mixture was thoroughly stirred. Hydroquinone was then added and heated at 50°C for 10 min. Dodecane bromide was then added dropwise, and the mixture was heated at 80°C with stirring for 6 h. Unreacted products were precipitated with acetone, filtered, and vacuum dried to obtain an antibacterial modifier, wherein the amount of hydroquinone added was 0.2% of the mass of 2-morpholinylethyl methacrylate, and the molar ratio of dodecane bromide to 2-morpholinylethyl methacrylate was 1:1. S1.3: Add the above antibacterial modifier to a 25% ethanol solution at a solid-liquid ratio of 1 g:20 mL, stir thoroughly to dissolve, then add the above pretreated polypropylene fiber fabric at a bath ratio of 1:20. After fully immersing, add potassium persulfate and N,N'-methylenebisacrylamide. Heat and stir under nitrogen at 60°C for 2 h. Remove, squeeze out excess liquid, and vacuum dry to obtain the inner layer fabric. The amount of potassium persulfate added is 0.3 wt% and the amount of N,N'-methylenebisacrylamide added is 0.06 wt%. S2: Reinforced hydrophilic modified polyester fiber S2.1: Immerse the polyester fiber in an aqueous solution containing 1% sodium hydroxide and 0.5% sodium lauryl sulfate at 70°C for 20 minutes, then wash with deionized water until neutral and dry to obtain a pretreated polyester fiber; S2.2: Mix tetramethylammonium chloride and citric acid in a 1:1 molar ratio and stir at 70°C for 40 min to obtain a transparent homogeneous liquid. S2.3: Immerse the pretreated polyester fiber in the transparent homogeneous liquid at a bath ratio of 1:20 and stir at 70°C for 90 minutes. After removal, soak in -10°C ice ethanol for 3 minutes, and then ultrasonically clean in ethanol and deionized water for 10 minutes, thereby obtaining a hydrophilically modified polyester fiber. S2.4: Immerse the hydrophilically modified polyester fiber in a 0.5% polyacrylic acid solution, heat treat at 40°C for 30 minutes, remove, and then heat cure at 110°C for 10 minutes to obtain a reinforced hydrophilically modified polyester fiber; S3: Preparation of outer fabric and core fabric S3.1: Soak bamboo fibers in an aqueous solution containing cellulase and xylanase at a bath ratio of 1:20 at 40°C for 2 hours. Remove the fibers and then soak them in a 5% glycerol solution at 50°C for 20 minutes to obtain pretreated bamboo fibers, wherein the amount of cellulase added is 2% of the weight of the bamboo fibers, and the amount of xylanase added is 1% of the weight of the bamboo fibers. S3.2: Blending the pretreated bamboo fiber with the reinforced hydrophilic modified polyester fiber obtained in step S2.4 at a mass ratio of 1:2 to obtain an outer layer fabric; S3.3: Blending the pretreated bamboo fiber with polypropylene fiber in a mass ratio of 1:2 to obtain a core layer fabric; S4: Bonding The inner layer fabric, the core layer fabric and the outer layer fabric are bonded together to obtain a moisture-absorbing, quick-drying and antibacterial composite fabric.

[0024] Example 2 A preparation process of a moisture-absorbing, quick-drying, antibacterial composite fabric containing bamboo fiber, such as Figure 1 As shown, the following steps are included: S1: Preparation of inner fabric S1.1: Soak the polypropylene fiber fabric in a 5% sodium hydroxide solution at 55°C for 25 minutes, then wash with deionized water until neutral and dry. Activate the surface of the fabric by treating it with a plasma treatment apparatus for 2.5 minutes to obtain a pretreated polypropylene fiber fabric. S1.2: 2-Morpholinylethyl methacrylate was added to anhydrous ethanol in a mass ratio of 1:5, and the mixture was thoroughly stirred. Hydroquinone was then added and heated at 55°C for 15 minutes. Dodecane bromide was then added dropwise, and the mixture was heated at 85°C with stirring for 7 hours. Unreacted products were precipitated with acetone, filtered, and vacuum dried to obtain an antibacterial modifier, wherein the amount of hydroquinone added was 0.25% of the mass of 2-morpholinylethyl methacrylate, and the molar ratio of dodecane bromide to 2-morpholinylethyl methacrylate was 1:1. S1.3: Add the above antibacterial modifier to a 25% ethanol solution at a solid-liquid ratio of 1 g:25 mL, stir thoroughly to dissolve, then add the above pretreated polypropylene fiber fabric at a bath ratio of 1:22. After fully immersing, add potassium persulfate and N,N'-methylenebisacrylamide. Heat and stir under nitrogen at 70°C for 3 h. Remove, squeeze out excess liquid, and vacuum dry to obtain the inner layer fabric. The amount of potassium persulfate added is 0.4 wt% and the amount of N,N'-methylenebisacrylamide added is 0.07 wt%. S2: Reinforced hydrophilic modified polyester fiber S2.1: Immerse the polyester fiber in an aqueous solution containing 1% sodium hydroxide and 0.5% sodium lauryl sulfate at 75°C for 25 minutes, then wash with deionized water until neutral and dry to obtain a pretreated polyester fiber; S2.2: Mix tetramethylammonium chloride and citric acid in a molar ratio of 1:1.5 and stir at 75°C for 45 min to obtain a transparent homogeneous liquid. S2.3: Immerse the pretreated polyester fiber in the transparent homogeneous liquid at a bath ratio of 1:25 and stir at 75°C for 105 minutes. Remove the pretreated polyester fiber and soak it in ice-cold ethanol at -10°C for 4 minutes. Then, ultrasonically clean it in ethanol and then in deionized water for 15 minutes to obtain a hydrophilically modified polyester fiber. S2.4: Immerse the hydrophilically modified polyester fiber in a 0.5% polyacrylic acid solution, heat treat at 45°C for 35 minutes, remove, and then heat cure at 115°C for 15 minutes to obtain a reinforced hydrophilically modified polyester fiber; S3: Preparation of outer fabric and core fabric S3.1: Soaking bamboo fibers in an aqueous solution containing cellulase and xylanase at a bath ratio of 1:25 at 45°C for 2.5 hours, removing the fibers, and then immersing them in a 5% glycerol solution at 55°C for 25 minutes to obtain pretreated bamboo fibers, wherein the amount of cellulase added is 2.5% of the weight of the bamboo fibers, and the amount of xylanase added is 1.5% of the weight of the bamboo fibers; S3.2: Blending the pretreated bamboo fiber with the reinforced hydrophilic modified polyester fiber obtained in step S2.4 at a mass ratio of 1:2.5 to obtain an outer layer fabric; S3.3: Blending the pretreated bamboo fiber with polypropylene fiber in a mass ratio of 1:2.5 to obtain a core layer fabric; S4: Bonding The inner layer fabric, the core layer fabric and the outer layer fabric are bonded together to obtain a moisture-absorbing, quick-drying and antibacterial composite fabric.

[0025] Example 3 A preparation process of a moisture-absorbing, quick-drying, antibacterial composite fabric containing bamboo fiber, such as Figure 1 As shown, the following steps are included: S1: Preparation of inner fabric S1.1: Soak the polypropylene fiber fabric in a 5% sodium hydroxide solution at 60°C for 30 minutes, then wash with deionized water until neutral and dry. Activate the surface of the fabric by treating it with a plasma treatment apparatus for 3 minutes to obtain a pretreated polypropylene fiber fabric. S1.2: 2-Morpholinylethyl methacrylate was added to anhydrous ethanol in a mass ratio of 1:6, and the mixture was thoroughly stirred. Hydroquinone was then added and heated at 60°C for 20 min. Dodecane bromide was then added dropwise, and the mixture was heated at 90°C with stirring for 8 h. Unreacted products were precipitated with acetone, filtered, and vacuum dried to obtain an antibacterial modifier, wherein the amount of hydroquinone added was 0.3% of the mass of 2-morpholinylethyl methacrylate, and the molar ratio of dodecane bromide to 2-morpholinylethyl methacrylate was 1:1. S1.3: Add the above antibacterial modifier to a 25% ethanol solution at a solid-liquid ratio of 1 g:30 mL, stir thoroughly to dissolve, then add the above pretreated polypropylene fiber fabric at a bath ratio of 1:25. After fully immersing, add potassium persulfate and N,N'-methylenebisacrylamide. Heat and stir under nitrogen at 80°C for 4 h. Remove, squeeze out excess liquid, and vacuum dry to obtain the inner layer fabric. The amount of potassium persulfate added is 0.5 wt%, and the amount of N,N'-methylenebisacrylamide added is 0.08 wt%. S2: Reinforced hydrophilic modified polyester fiber S2.1: Immerse the polyester fiber in an aqueous solution containing 1% sodium hydroxide and 0.5% sodium lauryl sulfate at 80°C for 30 minutes, then wash with deionized water until neutral and dry to obtain a pretreated polyester fiber; S2.2: Mix tetramethylammonium chloride and citric acid in a molar ratio of 1:2 and stir at 80°C for 50 min to obtain a transparent homogeneous liquid. S2.3: Immerse the pretreated polyester fiber in the transparent homogeneous liquid at a bath ratio of 1:30 and stir at 80°C for 120 minutes. Remove the pretreated polyester fiber and soak it in -10°C ice ethanol for 5 minutes. Then, ultrasonically clean it in ethanol and then in deionized water for 20 minutes to obtain a hydrophilically modified polyester fiber. S2.4: Immerse the hydrophilically modified polyester fiber in a 0.5% polyacrylic acid solution, heat treat at 50°C for 40 minutes, remove, and then heat cure at 120°C for 20 minutes to obtain a reinforced hydrophilically modified polyester fiber; S3: Preparation of outer fabric and core fabric S3.1: Soak bamboo fibers in an aqueous solution containing cellulase and xylanase at a bath ratio of 1:30 at 50°C for 3 hours. Remove the fibers and then soak them in a 5% glycerol solution at 60°C for 30 minutes to obtain pretreated bamboo fibers, wherein the amount of cellulase added is 3% of the weight of the bamboo fibers and the amount of xylanase added is 2% of the weight of the bamboo fibers. S3.2: Blending the pretreated bamboo fiber and the reinforced hydrophilic modified polyester fiber obtained in step S2.4 at a mass ratio of 1:3 to obtain an outer layer fabric; S3.3: Blending the pretreated bamboo fiber and polypropylene fiber in a mass ratio of 1:3 to obtain a core layer fabric; S4: Bonding The inner layer fabric, the core layer fabric and the outer layer fabric are bonded together to obtain a moisture-absorbing, quick-drying and antibacterial composite fabric.

[0026] Comparative Example 1 The difference between Comparative Example 1 and Example 1 is that step S1 is removed, and the inner layer fabric in step S4 is replaced with polypropylene fiber fabric.

[0027] Comparative Example 2 The difference between Comparative Example 2 and Example 1 is that steps S2.2-2.3 are removed, and the hydrophilic modified polyester fiber in step S2.4 is replaced by an equal amount of pretreated polyester fiber.

[0028] Comparative Example 3 The difference between Comparative Example 3 and Example 1 is that step S3.3 is removed, and the core layer fabric in step S4 is removed.

[0029] Comparative Example 4 The difference between Comparative Example 4 and Example 1 is that step S2.4 is removed, and the reinforced hydrophilic modified polyester fiber in step S3.2 is replaced by an equal amount of hydrophilic modified polyester fiber.

[0030] Test Case Test 1: Referring to GB / T20944.3-2008, the initial antibacterial rate and the antibacterial rate after 50 washes of the inner layer fabrics prepared in Examples 1-3 and the polypropylene fiber fabric used in Comparative Example 1 were tested. The test bacteria were Staphylococcus aureus. The test was repeated three times and the average value was taken. The results are shown in Table 1.

[0031] Table 1: Test results of the initial antibacterial rate of the inner fabric and the antibacterial rate after 50 washes As shown in Table 1 above, the initial antibacterial rates of the inner fabrics prepared in Examples 1-3 were all 99.99%, and after 50 washes, the antibacterial rates were all above 98.5%. However, the polypropylene fiber fabric without antibacterial modification used in Comparative Example 1 had no antibacterial effect. This shows that the surface oil and oligomers of the polypropylene fiber fabric were first removed by alkaline hydrolysis, and the specific surface area was increased by slight etching. Then, active groups were generated on the surface by plasma treatment, and then 2-morpholinoethyl methacrylate was mixed with dodecane bromide. A nucleophilic substitution reaction is carried out to generate an antibacterial modifier. After the antibacterial modifier is dissolved in an ethanol solution, the plasma-activated polypropylene fiber fabric is soaked therein, and potassium persulfate is used to initiate a free radical polymerization reaction between the antibacterial modifier and the polypropylene fiber fabric. The antibacterial modifier is connected to the surface of the polypropylene fiber fabric. At the same time, the antibacterial modifier is cross-linked with the cross-linking agent N,N'-methylenebisacrylamide to form a three-dimensional network, which gives the polypropylene fiber fabric a long-lasting antibacterial effect, thereby helping the inner layer fabric to inhibit the growth of bacteria in sweat and reduce odor.

[0032] Test 2: The water diffusion time, water absorption rate, water evaporation rate and water vapor permeability of the composite fabrics prepared in Examples 1-3 and Comparative Examples 2-3 were tested with reference to GB / T 21655.1-2008. The results are shown in Table 2.

[0033] Table 2: Test results of moisture absorption and quick-drying performance of composite fabrics As shown in Table 2 above, in Comparative Example 2, after the polyester fiber is not subjected to hydrophilic modification, the obtained composite fabric has a water diffusion time higher than that of Example 1, while the water absorption rate, water evaporation rate and moisture permeability are all lower than those of Example 1. Since the water diffusion time index mainly assesses the absorption rate of the fabric for liquid water, and the water absorption rate index mainly assesses the saturated absorption degree of the fabric for liquid water, the two comprehensively reflect the fabric's ability to absorb sweat when the human body sweats. Therefore, the sweat absorption capacity of the composite fabric prepared in Example 1 is significantly higher than that of Comparative Example 2. It can be seen that when tetramethylammonium chloride is mixed with citric acid, tetramethylammonium chloride acts as a hydrogen bond acceptor and combines with the carboxyl group of citric acid through hydrogen bonds to form a stable solvent system, and then the pretreated polyester fiber is soaked, so that the carboxylic acid group in the solvent system is adsorbed to the surface of the polyester fiber through hydrogen bonds and van der Waals forces to form a hydrophilic layer, thereby effectively improving the hydrophilicity of the polyester fiber, which is beneficial to improving the moisture absorption and quick-drying effect of the composite fabric. In Comparative Example 3, after the core layer fabric is removed, the water drip diffusion time of the composite fabric composed only of the inner layer fabric and the outer layer fabric is also higher than that of Example 1, and the water absorption rate, water evaporation rate and moisture permeability are also lower than those of Example 1. That is to say, the moisture absorption and quick-drying performance of the composite fabric prepared in Example 1 is better than that of Comparative Example 3. It can be seen that by blending the pretreated bamboo fiber and the polypropylene fiber to make the core layer fabric, and bonding it to the outer layer fabric and the inner layer fabric, since the hydrophilicity of the core layer fabric is between the inner layer fabric and the outer layer fabric, the core layer fabric first absorbs moisture through hydrogen bonding, and then transfers it to the outer layer with the help of the pores between the fibers. The highly hydrophilic porous structure of the outer layer fabric quickly absorbs moisture and spreads it, accelerating evaporation, thereby further improving the moisture absorption and quick-drying performance of the composite fabric.

[0034] In addition, the moisture permeability simulates the ability of moisture emitted by the skin to be conducted outward through the fabric. The higher the moisture permeability, the better the wearing comfort of the fabric. This shows that the composite fabrics prepared in Examples 1-3 are more comfortable than those in Comparative Examples 2-3.

[0035] Test 3: Referring to the test method of Test 2, the composite fabrics prepared in Examples 1-3 and Comparative Example 4 were tested for water diffusion time, water absorption rate, water evaporation rate and water vapor permeability after washing 50 times. The results are shown in Table 3.

[0036] Table 3: Test results of moisture absorption and quick-drying performance of composite fabrics after 50 washes As shown in Table 3, in Comparative Example 4, in which the hydrophilic modified polyester fiber was not reinforced, the water diffusion time of the composite fabric obtained after washing 50 times was significantly increased, while the water absorption rate, water evaporation rate and moisture permeability were significantly reduced. This shows that immersing the hydrophilic modified polyester fiber in the polyacrylic acid solution allows the polyacrylic acid to combine with the polyester fiber through hydrogen bonds to form a cross-linked network, which helps to improve the wash resistance of the composite fabric.

[0037] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical principles disclosed herein are intended to be covered by the claims of the present invention.

Claims

1. A moisture-absorbing, quick-drying, antibacterial composite fabric containing bamboo fiber, characterized in that: Including inner fabric, core fabric and outer fabric; Among them, the core layer fabric is a blend of pretreated bamboo fiber and polypropylene fiber, and the outer layer fabric is a blend of pretreated bamboo fiber and reinforced hydrophilic modified polyester fiber.

2. A process for preparing the moisture-absorbing, quick-drying, antibacterial composite fabric containing bamboo fiber according to claim 1, characterized in that: The steps include: S1: Preparation of inner fabric An antibacterial modifier is prepared by mixing 2-morpholinoethyl methacrylate and dodecane bromide, which is then dissolved in an ethanol solution and impregnated into pretreated polypropylene fiber fabric. Potassium persulfate and N,N'-methylenebisacrylamide are then added for reaction to obtain an inner layer fabric. S2: Reinforced hydrophilic modified polyester fiber Tetramethylammonium chloride and citric acid are mixed to prepare a transparent homogeneous liquid, which is then immersed in the pretreated polyester fiber for treatment, and then strengthened with a polyacrylic acid solution to obtain a strengthened hydrophilic modified polyester fiber; S3: Preparation of outer fabric and core fabric The bamboo fibers are pretreated, and then the pretreated bamboo fibers are blended with the aforementioned reinforced hydrophilic modified polyester fibers to obtain an outer layer fabric, and the pretreated bamboo fibers are blended with polypropylene fibers to obtain a core layer fabric; S4: Bonding The inner layer fabric, the core layer fabric and the outer layer fabric are bonded together to obtain a moisture-absorbing, quick-drying and antibacterial composite fabric.

3. The preparation process of the moisture-absorbing, quick-drying, antibacterial composite fabric containing bamboo fiber according to claim 2, characterized in that: S1 specifically includes the following steps: S1.1: Soak the polypropylene fiber fabric in a 5% sodium hydroxide solution at 50-60°C for 20-30 minutes, then wash with deionized water until neutral and dry, then treat with a plasma treatment apparatus for 2-3 minutes for surface activation to obtain a pretreated polypropylene fiber fabric. S1.2: Add 2-morpholinoethyl methacrylate to anhydrous ethanol in a mass ratio of 1:(4-6), stir thoroughly, add hydroquinone, and heat at 50-60°C for 10-20 minutes. Then, add dodecane bromide dropwise, heat at 80-90°C with stirring for 6-8 hours, and precipitate the unreacted product with acetone by rotary evaporation, filter, and vacuum dry to obtain an antibacterial modifier. S1.3: Add the above antibacterial modifier to 25% ethanol solution at a solid-liquid ratio of 1g:(20-30)mL, stir thoroughly to dissolve, then add the above pretreated polypropylene fiber fabric at a bath ratio of 1:(20-25), after fully immersing, add potassium persulfate and N,N'-methylenebisacrylamide, and heat and stir at 60-80℃ under nitrogen protection for 2-4h. Take out, squeeze out excess liquid and vacuum dry to obtain the inner layer fabric.

4. The preparation process of the moisture-absorbing, quick-drying, antibacterial composite fabric containing bamboo fiber according to claim 3, characterized in that: S2 specifically includes the following steps: S2.1: Immerse the polyester fiber in an aqueous solution containing 1% sodium hydroxide and 0.5% sodium lauryl sulfate at 70-80°C for 20-30 minutes, then wash with deionized water until neutral and dry to obtain a pretreated polyester fiber; S2.2: Mix tetramethylammonium chloride and citric acid in a molar ratio of 1:(1-2) and stir at 70-80°C for 40-50 min to obtain a transparent homogeneous liquid; S2.3: Immerse the pretreated polyester fiber in the transparent homogeneous liquid at a bath ratio of 1:(20-30) and stir at 70-80°C for 90-120 minutes. After removal, soak in -10°C ice ethanol for 3-5 minutes, and then ultrasonically clean with ethanol and deionized water for 10-20 minutes to obtain a hydrophilically modified polyester fiber. S2.4: Immerse the above hydrophilic modified polyester fiber in a 0.5% polyacrylic acid solution, heat it at 40-50°C for 30-40 minutes, take it out, and then heat cure it at 110-120°C for 10-20 minutes to obtain a reinforced hydrophilic modified polyester fiber.

5. The preparation process of the moisture-absorbing, quick-drying, antibacterial composite fabric containing bamboo fiber according to claim 4, characterized in that: S3 specifically includes the following steps: S3.1: Soaking bamboo fibers in an aqueous solution containing cellulase and xylanase at a bath ratio of 1:(20-30) at 40-50°C for 2-3 hours, removing the fibers and then immersing them in a 5% glycerol solution at 50-60°C for 20-30 minutes to obtain pretreated bamboo fibers; S3.2: Blending the pretreated bamboo fiber with the reinforced hydrophilic modified polyester fiber obtained in step S2.4 at a mass ratio of 1:(2-3) to obtain an outer layer fabric; S3.3: Blending the pretreated bamboo fiber and polypropylene fiber in a mass ratio of 1:(2-3) to obtain a core layer fabric.

6. The preparation process of the moisture-absorbing, quick-drying, antibacterial composite fabric containing bamboo fiber according to claim 3, characterized in that: The amount of hydroquinone added is 0.2-0.3% of the mass of 2-morpholinylethyl methacrylate.

7. The process for preparing the moisture-absorbing, quick-drying, antibacterial composite fabric containing bamboo fiber according to claim 3, characterized in that: The molar ratio of dodecane bromide to 2-morpholinoethyl methacrylate is 1:

1.

8. The process for preparing the moisture-absorbing, quick-drying, antibacterial composite fabric containing bamboo fiber according to claim 3, characterized in that: The amount of potassium persulfate added is 0.3-0.5wt%.

9. The process for preparing the moisture-absorbing, quick-drying, antibacterial composite fabric containing bamboo fiber according to claim 3, characterized in that: The addition amount of N,N'-methylenebisacrylamide is 0.06-0.08wt%.

10. The process for preparing a moisture-absorbing, quick-drying, antibacterial composite fabric containing bamboo fiber according to claim 5, characterized in that: The amount of cellulase added is 2-3% of the mass of the bamboo fiber, and the amount of xylanase added is 1-2% of the mass of the bamboo fiber.

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