Breathable antibacterial fabric and preparation method thereof

Abstract

The invention relates to the technical field of clothing fabrics, in particular to a breathable antibacterial fabric and a preparation method thereof. The breathable antibacterial fabric is prepared by the following steps: spinning modified polyester fibers and ramie fibers into yarns, weaving into gray fabric, desizing and refining, padding with clear water, sizing and drying to obtain a fabric layer, finally putting the fabric layer into an antibacterial solution, fully oscillating and padding, carrying out antibacterial finishing to obtain an antibacterial layer, and drying to obtain the breathable antibacterial fabric. The breathable antibacterial fabric prepared by the invention has the advantages of excellent long-term antibacterial performance, breathability and hygroscopicity, better hydrophobic effect, bacterial adhesion prevention and the like.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of clothing fabric, in particular to a breathable antibacterial fabric and a preparation method thereof. BACKGROUND

[0002] With the improvement of people's living standards, people's requirements for clothing fabric are getting higher and higher. Polyester fabric is widely used in underwear, wedding dresses, evening dresses, sportswear and other clothing due to its excellent elasticity, wrinkle resistance, shape retention and wear resistance. However, the rigid benzene ring contained in the polyester molecule makes the molecular chain easy to keep linear, resulting in hard hand feeling and poor touch feeling of the polyester fabric. In view of this problem, the invention with publication number CN103556494B discloses a durable easy-care fine denier hollow polyester silk-like woven fabric product, which adds a polyester-polyether-silicone ternary copolymer hydrophilic soft finishing agent in the post-treatment liquid. The polysiloxane segment in the soft finishing agent gives the knitted fabric good softness. Therefore, using a soft finishing agent to soften the polyester has gradually become a commonly used method. In summer, the weather is hot, and the comfortable microclimate environment between the skin and the clothes is destroyed when people exercise, which makes them sweat a lot. The sweat sticks to the skin surface, causing a sticky feeling. The discharged sweat provides a favorable environment for the proliferation of bacteria at a suitable temperature, resulting in a large number of bacteria and a peculiar smell. However, the hygroscopicity of polyester is poor, and there is no other polar group in its molecule except the hydroxyl group at both ends, so it is difficult to absorb sweat. In addition, the air permeability of polyester is also poor, which makes it difficult for the sweat remaining on the skin surface to evaporate into the air quickly, resulting in a poor wearing experience of the clothes. SUMMARY

[0003] In order to solve the problem of poor moisture absorption and sweat release performance and poor antibacterial performance of the current polyester fabric due to poor hygroscopicity and air permeability, the present application provides a breathable antibacterial fabric and a preparation method thereof. By modifying the polyester fiber (introducing hydrophilic urethane groups) and the synergistic effect of ramie fiber, a three-level moisture transfer mechanism of "moisture absorption-humidity transfer-sweat release" is formed. Combined with modified terpineol (inhibiting bacterial adhesion) and carbon nanotube composite long-acting antibacterial agent, the unification of air permeability, antibacterial property and comfort is realized. The breathable antibacterial fabric prepared by the present application has excellent long-lasting antibacterial performance, air permeability, hygroscopicity, and good hydrophobic effect, bacterial adhesion prevention and other advantages.

[0004] In the first aspect, the present application provides a preparation method of a breathable antibacterial fabric, which adopts the following technical scheme: A preparation method of a breathable antibacterial fabric, comprising the following steps: S1, according to the mass fraction, 75-85 parts of modified polyester fiber and 15-25 parts of ramie fiber are respectively spun into yarn by a spinning machine, and then sent to a weaving machine for weaving to form a gray fabric; S2, using a high-pressure jet overflow machine to treat the gray fabric for desizing and refining; S3, the treated gray fabric is first immersed in clean water, then subjected to setting and drying treatment to obtain a fabric layer; S4, the fabric layer is placed in an antibacterial liquid and subjected to sufficient oscillation and immersion to perform antibacterial finishing to obtain an antibacterial layer, and after drying, a breathable antibacterial fabric is obtained, wherein the antibacterial liquid comprises the following components by weight: hydrophobic antibacterial agent 10-12 parts, carbon nanotube composite long-acting antibacterial agent 3-5 parts, silane coupling agent 4-6 parts, ethanol 10-12 parts, and deionized water 75-80 parts.

[0005] By adopting the above technical scheme, the modified polyester fiber and ramie fiber: the modified polyester fiber improves the hydrophilicity and moisture absorption of the polyester fiber by introducing hydrophilic urethane groups. Ramie fiber provides good air permeability due to its unique groove-shaped cavity and pore structure. The combination of the two provides the effect of moisture absorption and sweat wicking. The groove-shaped cavity structure of ramie fiber and the moisture absorption of modified polyester synergistically form a'moisture absorption-humidity conduction-sweat wicking' three-level humidity conduction mechanism, significantly improving air permeability. The composition of the antibacterial liquid: hydrophobic antibacterial agent (modified terpineol): has antibacterial, anti-inflammatory, antioxidant and other properties, and is environmentally friendly and less likely to cause skin allergies. Its three-dimensional structure affects the bacterial sensing system and reduces bacterial adhesion. Carbon nanotube composite long-acting antibacterial agent: by introducing carboxyl and hydroxyl groups and chemical grafting with L-cysteine, eugenol and cardanol, the antibacterial performance is enhanced. At the same time, the stable composite structure is formed by the coordination bond with silver ions, providing long-lasting antibacterial effect. Silane coupling agent: used to improve the bonding force between the antibacterial agent and the fiber, ensuring that the antibacterial agent can be firmly attached to the fabric. Ethanol and deionized water: as a solvent and diluent, help the antibacterial agent to be evenly distributed on the fabric. Step S1: forming a gray fabric through spinning and weaving provides a basis for subsequent processing. Step S2: high-pressure jet overflow machine is used to treat the gray fabric for desizing and refining to remove impurities and improve fabric quality. Step S3: water immersion and setting and drying treatment ensure the flatness and stability of the fabric layer. Step S4: antibacterial liquid treatment gives the fabric antibacterial properties, and drying ensures the firm attachment of the antibacterial agent. Each component and step cooperates to jointly affect the final performance of the fabric. Modified polyester fiber and ramie fiber provide basic moisture absorption and sweat wicking performance; hydrophobic antibacterial agent and carbon nanotube composite long-acting antibacterial agent provide antibacterial effect through chemical grafting and coordination bond formation; silane coupling agent ensures the close combination of the antibacterial agent and the fiber; ethanol and deionized water help the antibacterial agent to be evenly distributed. These components and steps jointly act on the fabric preparation process to ensure that the final product has excellent antibacterial properties, air permeability, moisture absorption and comfort.

[0006] Preferably, in step S1, the preparation method of the modified polyester fiber comprises the following steps: S21, 10 parts of polyester fiber was placed in 130 parts of 10% sodium hydroxide solution according to mass fraction, and treated in 90-95℃ water bath for 40-50 min, then filtered, washed to neutral, and dried; S22, 8 parts of the alkali-treated polyester fiber and 200 parts of 1,4-dioxane were mixed according to mass fraction, then 25 parts of isophorone diisocyanate and 0.2-0.3 parts of tin 2-ethylhexanoate were added, stirred uniformly, the temperature was raised to 71-75℃, and reacted for 3.5-4 h. After the reaction was completed, the solvent was removed by distillation under reduced pressure to obtain modified polyester fiber.

[0007] By adopting the above technical scheme, in step S21, the polyester fiber is treated with alkali, and the polyester fiber is treated with a sodium hydroxide (NaOH) solution. The strong alkalinity of NaOH can partially hydrolyze the ester bond (-COO-) on the surface of the polyester (polyester fiber) to generate active groups such as carboxyl (-COOH) and hydroxyl (-OH), thereby significantly improving the hydrophilicity and chemical reactivity of the fiber surface. Under high-temperature (90-95°C) conditions, the alkali treatment can partially etch the surface of the fiber to form micropores or rough structures, thereby increasing the contact area for subsequent grafting reactions. The original polyester fiber has poor moisture absorption due to the small number of polar groups and high crystallinity in the molecular chain. The alkali treatment introduces polar groups and roughens the surface, thereby providing reaction sites for subsequent isocyanate grafting and laying the foundation for hydrophilic modification. In step S22, isocyanate grafting modification is performed. 1,4-dioxane is a polar aprotic solvent that can dissolve isocyanate monomers (IPDI) and promote the reaction of the isocyanate monomers with the hydroxyl groups / carboxyl groups on the surface of the polyester. 2-ethylhexanoic acid tin is used as a Lewis acid catalyst to accelerate the addition reaction of the isocyanate group (-NCO) and the hydroxyl group (-OH) to generate a urethane bond (-NHCOO-). The two isocyanate groups of IPDI react with the hydroxyl groups on the surface of the polyester and the polyethylene glycol segments (such as the subsequent introduction of polyethylene glycol methacrylate) to form a cross-linked network: polyester-OH + OCN-R-NCO → polyester-OOCNH-R-NHCOO- (grafting). The grafted polyethylene glycol segments impart hydrophilicity to the fiber, and the long-chain structure of IPDI can improve the flexibility of the fiber. The prepared modified polyester fiber has the following effects: hydrophilicity and moisture conductivity: the grafted urethane and polyethylene glycol segments significantly increase the polar groups on the surface of the fiber, making the moisture absorption of the modified polyester close to that of cotton fiber. Synergistic effect with ramie fiber: the porous structure (porosity of about 30%) of the ramie fiber provides a channel for sweat evaporation, and the modified polyester quickly adsorbs sweat to the surface of the ramie fiber through capillary effect, forming a “sorption-transportation-removal” synergistic moisture transport mechanism. The increased negative charge on the surface of the modified fiber inhibits the adhesion of negatively charged bacteria (such as Staphylococcus aureus) through electrostatic repulsion. The rough surface of the modified fiber can increase the loading capacity of the antibacterial agent (such as modified terpineol), thereby prolonging the release time. The balance between the hydrophilicity of the fiber and the hydrophobicity of the antibacterial agent can achieve a dual mechanism of “surface anti-adhesion + internal sterilization”.

[0008] Preferably, in step S2, the temperature of the desizing and refining treatment is 110-120°C, and the time is 30-35 min.

[0009] Preferably, in step S4, the hydrophobic antibacterial agent is modified terpilenol, and the preparation method thereof comprises the following steps: adding 50 parts of tetrahydrofuran, 6.3 parts of acrylic anhydride and 0.002 parts of 4-dimethylaminopyridine into a reactor, stirring at 73℃ to obtain a mixed solution, adding 15.4 parts of terpilenol into the mixed solution, continuously reacting to obtain an intermediate solution, adding 0.1 parts of sodium persulfate and 5.3 parts of polyethylene glycol methacrylate into the intermediate solution, and polymerizing at 73℃ for 6 hours, cooling, filtering, washing the solid with ethanol for three times, drying, and obtaining modified terpilenol.

[0010] By adopting the technical scheme, the modified terpilenol is introduced into polyacrylate copolymer and polyethylene glycol methacrylate. These components significantly improve the thermal stability and biocompatibility of the modified terpilenol. These characteristics enable the modified terpilenol to stably play an anti-adhesion and antibacterial role in the process of high-temperature drying, baking and ironing. At the same time, the spatial structure of the modified terpilenol affects the sensing system of bacteria, so that the bacteria actively do not adhere to the surface of the fabric, thereby endowing the fabric with excellent antibacterial adhesion effect. As a hydrophobic antibacterial agent, the spatial structure of the modified terpilenol and the introduced polyacrylate copolymer and other components jointly improve the antibacterial performance of the fabric. At the same time, the modified terpilenol cooperates with other components (such as carbon nanotube composite long-acting antibacterial agent and silane coupling agent) in the antibacterial solution, further enhancing the antibacterial effect and hydrophobic effect of the fabric. The thermal stability and acid stability of the modified terpilenol ensure that the antibacterial fabric can stably play an antibacterial role in the subsequent processing process. At the same time, the biocompatibility of the modified terpilenol enhances its destructiveness to bacteria, further improving the antibacterial effect of the antibacterial layer. The structure of the modified terpilenol affects the sensing system of bacteria, so that the bacteria actively do not adhere to the surface of the fabric, thereby endowing the fabric with excellent antibacterial adhesion effect. This anti-adhesion effect cooperates with other components in the antibacterial solution, further improving the antibacterial effect and hydrophobic effect of the fabric. In summary, the role of the modified terpilenol in the preparation of the breathable antibacterial fabric mainly lies in improving the antibacterial performance, stability and anti-adhesion effect of the fabric. At the same time, it cooperates with other components in the antibacterial solution, further enhancing the overall antibacterial effect and hydrophobic effect of the fabric.

[0011] Preferably, in step S4, the preparation method of the carbon nanotube composite long-acting antibacterial agent comprises the following steps: S41, according to the mass fraction, 7 parts of carbon nanotube is soaked in 200 parts of 85% mass concentration sulfuric acid solution, heated to 80℃ and stirred for 60-70 minutes, then filtered, washed with deionized water for 3 times, and dried at 80℃ under vacuum to constant weight to obtain pretreated carbon nanotubes; S42, the pretreated carbon nanotubes and anhydrous ethanol are mixed according to the mass fraction, L-cysteine is added and ultrasonic treated for 15-20 minutes, a natural antibacterial agent and a photoinitiator 1173 are mixed and then irradiated under 365nm ultraviolet light for 8-10h, silver nitrate is added and heated to 35℃ and stirred for 50-60 minutes, the solid is taken out by centrifugation, washed, vacuum dried at 50℃ until constant weight, and a carbon nanotube composite long-acting antibacterial agent is obtained.

[0012] By adopting the technical scheme, S41: the carbon nanotubes are soaked in a sulfuric acid solution for pretreatment, and carboxyl and hydroxyl groups are introduced by heating and stirring. S42: the pretreated carbon nanotubes are mixed with L-cysteine, a natural antibacterial agent and a photoinitiator, reacted under ultraviolet irradiation, and stirred and dried after adding silver nitrate, to obtain a carbon nanotube composite long-acting antibacterial agent. The carbon nanotube composite long-acting antibacterial agent is combined with L-cysteine and a natural antibacterial agent by introducing carboxyl and hydroxyl groups, which significantly improves the antibacterial performance of the antibacterial fabric. At the same time, the antibacterial effect is further enhanced by the introduction of silver ions. The carbon nanotubes and silver ions in the carbon nanotube composite long-acting antibacterial agent form a stable composite structure, so that the fabric has stable antibacterial performance and improves the antibacterial persistence of the antibacterial fabric. The carbon nanotube composite long-acting antibacterial agent and the modified terpineol synergize to improve the antibacterial effect of the fabric. The antibacterial property and anti-adhesion property of the modified terpineol combined with the persistent antibacterial performance of the carbon nanotube composite long-acting antibacterial agent enable the fabric to maintain excellent antibacterial effect under various conditions. The spatial structure of the modified terpineol affects the perception system of bacteria, so that the bacteria actively do not adhere to the surface of the fabric, and the antibacterial effect of the carbon nanotube composite long-acting antibacterial agent synergizes to further improve the hydrophobic effect of the antibacterial fabric. In summary, the role of the carbon nanotube composite long-acting antibacterial agent in the preparation of the breathable antibacterial fabric mainly lies in improving the antibacterial performance and stability of the fabric. At the same time, it synergizes with the modified terpineol to further enhance the overall antibacterial effect and hydrophobic effect of the fabric.

[0013] Preferably, in step S42, the mass fraction ratio of the pretreated carbon nanotubes, anhydrous ethanol, L-cysteine, a natural antibacterial agent, a photoinitiator 1173 and silver nitrate is 20:70:4.5-5:8-9:0.35-0.38:2.5-3.

[0014] Preferably, in step S42, the natural antibacterial agent is composed of cardanol and eugenol in a mass fraction ratio of 3:2.

[0015] Preferably, in step S4, the silane coupling agent is composed of vinyltrimethoxysilane and N-β-(aminoethyl)-γ-aminopropylmethyldimethoxysilane in a mass fraction ratio of 4:3.

[0016] By adopting the above technical scheme, the methoxy group (-OCH3) of vinyl trimethoxysilane (VTMS) is hydrolyzed to form a silanol group (-Si-OH), which forms a covalent bond with the hydroxyl group (-OH) or amino group (-NH2) on the surface of the fiber (such as polyester and ramie), thereby enhancing the interfacial bonding force between the antibacterial agent and the fiber. The vinyl group (-CH=CH2) imparts a certain hydrophobicity to the surface of the fiber, which synergizes with the hydrophobic antibacterial effect of modified terpineol to improve the hydrophobicity of the fabric. The amino group (-NH2) in the N-β-(aminoethyl)-γ-aminopropyl methyl dimethoxysilane (AEAPMDS) molecule can form a hydrogen bond or a coordination bond with the carboxyl group (-COOH), the hydroxyl group (-OH) or the silver ion (Ag + ) in the antibacterial agent (such as modified terpineol, carbon nanotube composite long-acting antibacterial agent), thereby enhancing the anchoring effect of the antibacterial agent on the fiber. The amino group and the hydrolysis product (silanol group) of the silane coupling agent form a cross-linked network, thereby improving the mechanical stability and washability of the antibacterial layer. The synergistic effect of the two: the silanol group of VTMS is combined with the surface of the fiber, and the amino group of AEAPMDS is combined with the active groups of the antibacterial agent, thereby forming a three-dimensional cross-linked structure of "fiber-silane-antibacterial agent", which significantly improves the adhesion of the antibacterial agent on the fiber. The optimized mass ratio of 4:3: VTMS (4 parts) provides more binding sites with the fiber, ensuring that the antibacterial agent uniformly covers the surface of the fiber; AEAPMDS (3 parts) prevents the antibacterial agent from falling off during washing or rubbing through the strong interaction between the amino group and the antibacterial agent, thereby prolonging the antibacterial durability. The vinyl group of VTMS imparts hydrophobicity to the surface of the fiber, reduces moisture retention, and inhibits bacterial growth; the amino group of AEAPMDS destroys the bacterial cell membrane through electrostatic interaction, which is complementary to the antibacterial mechanism of modified terpineol, thereby forming a multiple antibacterial barrier. The cross-linked network of VTMS and AEAPMDS remains stable during high-temperature drying or ironing, thereby avoiding the failure of the antibacterial agent due to thermal decomposition; the amino group of EAPMDS is coordinated with the silver ion (from the carbon nanotube composite long-acting antibacterial agent) to form a stable complex, thereby reducing the loss of silver ions and ensuring the long-term effectiveness of the antibacterial performance. The synergistic effect of the silane coupling agent enables the antibacterial agent (modified terpineol, carbon nanotube composite long-acting antibacterial agent) to be uniformly and stably fixed on the surface of the fiber, which can still maintain antibacterial activity even after multiple washes. The hydrophobicity of VTMS and the antibacterial active groups of AEAPMDS not only reduce bacterial adhesion but also kill bacteria through chemical action, thereby achieving the dual effect of "preventing bacteria + killing bacteria". The cross-linked structure of the silane coupling agent protects the antibacterial agent from stable performance in subsequent high-temperature treatment (such as drying and ironing) or in a sweat (weakly acidic) environment. In summary, vinyl trimethoxysilane and N-β-(aminoethyl)-γ-aminopropyl methyl dimethoxysilane are compounded at a ratio of 4:3, which significantly improves the adhesion, washability and thermal stability of the antibacterial agent on the fiber through chemical bond synergy, functional complementarity and structural optimization, while enhancing the hydrophobicity and antibacterial performance of the fabric.

[0017] In a second aspect, the present application provides a breathable antibacterial fabric, which employs the following technical solution: As a general technical concept, the present application also provides the above-mentioned breathable antibacterial fabric, which is prepared by the above-mentioned preparation method of the breathable antibacterial fabric.

[0018] In summary, the present application has the following beneficial technical effects: 1. Long-acting antibacterial performance: The modified terpineol interferes with the bacterial sensing system through the steric structure, inhibits bacterial adhesion, and the grafted polyacrylate copolymer enhances the thermal stability, ensuring that the antibacterial effect can still be stable after high-temperature treatment (such as drying and ironing). Carbon nanotube composite long-acting antibacterial agent: Carbon nanotube composite silver ion (Ag + ) forms a stable structure through coordination bond, silver ion continuously releases, destroys bacterial cell membrane and inhibits its metabolism; the phenolic hydroxyl groups of eugenol and cardanol further synergistically kill bacteria, realizing the dual mechanism of "physical anti-adhesion + chemical sterilization". The silane coupling agent (VTMS+AEAPMDS) firmly anchors the antibacterial agent on the fiber surface through the crosslinking network, which can still maintain antibacterial activity even after multiple washes. The stability of the silver ion and carbon nanotube composite structure significantly prolongs the persistence of the antibacterial effect.

[0019] 2. Excellent moisture absorption and perspiration and breathability: The modified polyester fiber introduces hydrophilic urethane groups, significantly improving the moisture absorption of polyester, which can quickly absorb sweat to the fiber surface. The groove-like cavity and porous structure of ramie form a "capillary channel" to quickly guide and evaporate the sweat absorbed on the surface of polyester, avoiding sweat retention and keeping the skin dry. The combination of the hydrophobicity of modified terpineol and the moisture absorption and breathability of ramie not only reduces the environment for bacterial growth, but also realizes efficient perspiration.

[0020] 3. Comfort and environmental protection: Terpineol, eugenol, and cardanol are all plant-derived, environmentally friendly and non-toxic, reducing the risk of skin allergies. The introduction of methacrylic acid polyethylene glycol ester enhances the biocompatibility of modified terpineol, reducing the stimulation to normal human cells. The natural properties of ramie fiber give the fabric a soft touch, combined with the moisture absorption of modified polyester, improving the comfort of wearing.

[0021] 4. Hydrophobic and anti-pollution performance: The hydrophobic groups of modified terpineol effectively prevent stains and water penetration. DETAILED DESCRIPTION

[0022] The embodiments of the present application will be described in detail below with reference to the examples, but those skilled in the art will understand that the following examples are only for illustration of the present application and should not be regarded as limiting the scope of the present application. If no specific conditions are specified in the examples, the conventional conditions or the conditions recommended by the manufacturer are used. If no manufacturer of the reagents or instruments used is specified, it is a conventional product that can be purchased on the market.

[0023] In the following examples and preparation examples, 1 part represents 100 g.

[0024] Preparation of modified polyester fiber in preparation example 1 The preparation method of the modified polyester fiber comprises the following steps: S21, according to the mass fraction, 10 parts of polyester fiber is placed in 130 parts of sodium hydroxide solution with a mass concentration of 10%, treated in a 93℃ water bath for 45 min, then filtered, washed to neutral, and dried; S22, according to the mass fraction, 8 parts of alkali treated polyester fiber and 200 parts of 1,4-dioxane are mixed, then 25 parts of isophorone diisocyanate and 0.25 parts of tin 2-ethylhexanoate are added, stirred uniformly, the temperature is raised to 73℃, and reacted for 3.7h. After the reaction is completed, the solvent is removed by reduced pressure distillation to obtain the modified polyester fiber.

[0025] Preparation of modified terpineol in preparation example 2 The preparation method of the modified terpineol is as follows: according to the mass fraction, 50 parts of tetrahydrofuran, 6.3 parts of acrylic anhydride and 0.002 parts of 4-dimethylaminopyridine are added to a reactor, stirred at 73℃ to obtain a mixed solution, 15.4 parts of terpineol is added to the mixed solution, and the reaction is continued to obtain an intermediate solution, 0.1 parts of sodium persulfate and 5.3 parts of polyethylene glycol methacrylate are added to the intermediate solution, and the polymerization reaction is carried out at 73℃ for 6h, then the mixture is cooled, filtered, the solid is retained, washed with ethanol for three times, and dried to obtain the modified terpineol.

[0026] Preparation of carbon nanotube composite long-acting antibacterial agent in preparation example 3 The preparation method of the carbon nanotube composite long-acting antibacterial agent comprises the following steps: S41, according to the mass fraction, 7 parts of carbon nanotube is soaked in 200 parts of sulfuric acid solution with a mass concentration of 85%, heated to 80℃ and stirred for 65 min, then filtered, washed with deionized water for three times, and dried at 80℃ under vacuum to constant weight to obtain pretreated carbon nanotube; S42, according to the mass fraction, 20 parts of pretreated carbon nanotube and 70 parts of anhydrous ethanol are mixed, then 4.8 parts of L-cysteine is ultrasonically treated for 18 min, 8.5 parts of natural antibacterial agent and 0.37 parts of photoinitiator 1173 are mixed, then the mixture is irradiated under 365nm ultraviolet light for 9h, then 2.8 parts of silver nitrate is added, heated to 35℃ and stirred for 55 min, then centrifuged to obtain the solid, washed, and dried at 50℃ under vacuum to constant weight to obtain the carbon nanotube composite long-acting antibacterial agent, wherein the natural antibacterial agent is composed of cardanol and eugenol in a mass fraction ratio of 3:2.

[0027] Example 1 A preparation method of a breathable antibacterial fabric comprises the following steps: S1, 75 parts of modified polyester fiber and 25 parts of ramie fiber are respectively spun into yarns by a spinning machine, and then are sent into a weaving machine to be woven to form a gray cloth according to mass fractions; S2, the gray cloth is subjected to desizing and refining treatment by a high-pressure jet overflow machine, the temperature of the desizing and refining treatment is 110 DEG C, and the time is 35 min; S3, the treated gray cloth is first immersed in clean water, and then is subjected to setting and drying treatment to obtain a fabric layer; S4, the fabric layer is fully oscillated and immersed in an antibacterial liquid to be subjected to antibacterial finishing, an antibacterial layer is obtained, and after drying, a breathable antibacterial fabric is obtained, wherein the antibacterial liquid comprises the following substances in parts by weight: 10 parts of modified pinol, 3 parts of carbon nanotube composite long-acting antibacterial agent, 4 parts of silane coupling agent, 10 parts of ethanol, and 75 parts of deionized water, the silane coupling agent is composed of vinyltrimethoxysilane and N-beta-(aminoethyl)-gamma-aminopropyl methyl dimethoxysilane in a mass fraction ratio of 4:3.

[0028] Example 2 A preparation method of a breathable antibacterial fabric comprises the following steps: S1, 85 parts of modified polyester fiber and 15 parts of ramie fiber are respectively spun into yarns by a spinning machine, and then are sent into a weaving machine to be woven to form a gray cloth according to mass fractions; S2, the gray cloth is subjected to desizing and refining treatment by a high-pressure jet overflow machine, the temperature of the desizing and refining treatment is 120 DEG C, and the time is 30 min; S3, the treated gray cloth is first immersed in clean water, and then is subjected to setting and drying treatment to obtain a fabric layer; S4, the fabric layer is fully oscillated and immersed in an antibacterial liquid to be subjected to antibacterial finishing, an antibacterial layer is obtained, and after drying, a breathable antibacterial fabric is obtained, wherein the antibacterial liquid comprises the following substances in parts by weight: 12 parts of modified pinol, 5 parts of carbon nanotube composite long-acting antibacterial agent, 6 parts of silane coupling agent, 12 parts of ethanol, and 80 parts of deionized water, the silane coupling agent is composed of vinyltrimethoxysilane and N-beta-(aminoethyl)-gamma-aminopropyl methyl dimethoxysilane in a mass fraction ratio of 4:3.

[0029] Example 3 A preparation method of a breathable antibacterial fabric comprises the following steps: S1, 80 parts of modified polyester fiber and 20 parts of ramie fiber are respectively spun into yarns by a spinning machine, and then are sent into a weaving machine to be woven to form a gray cloth according to mass fractions; S2, the gray cloth is subjected to desizing and refining treatment by a high-pressure jet overflow machine, the temperature of the desizing and refining treatment is 115 DEG C, and the time is 33 min; S3, the treated gray cloth is first immersed in clean water, and then is subjected to setting and drying treatment to obtain a fabric layer; S4, the fabric layer is placed in an antibacterial liquid for sufficient oscillation and immersion, and is subjected to antibacterial finishing to obtain an antibacterial layer, and after drying, a breathable antibacterial fabric is obtained, wherein the antibacterial liquid comprises the following components in parts by weight: modified terpineol 11 parts, carbon nanotube composite long-acting antibacterial agent 4 parts, silane coupling agent 5 parts, ethanol 11 parts, and deionized water 78 parts, and the silane coupling agent is composed of vinyltrimethoxysilane and N-β-(aminoethyl)-γ-aminopropyl methyl dimethoxysilane in a mass ratio of 4:3.

[0030] Comparative Example 1 The same as Example 3, except that equal mass parts of unmodified polyester fiber are used instead of modified polyester fiber.

[0031] Comparative Example 2 The same as Example 3, except that in step S4, equal mass parts of unmodified terpineol are used instead of modified terpineol.

[0032] Comparative Example 3 The same as Example 3, except that in step S4, modified terpineol is 15 parts and carbon nanotube composite long-acting antibacterial agent is 0 part.

[0033] Comparative Example 4 The same as Example 3, except that in step S4, modified terpineol is 0 part and carbon nanotube composite long-acting antibacterial agent is 15 parts.

[0034] Comparative Example 5 The same as Example 3, except that in step S4, the silane coupling agent is vinyltrimethoxysilane.

[0035] Comparative Example 6 The same as Example 3, except that in step S4, the silane coupling agent is ethyl N-β-(aminoethyl)-γ-aminopropyl methyl dimethoxysilane.

[0036] Performance Test The breathable antibacterial fabrics prepared in Examples 1-3 and Comparative Examples 1-6 are sampled and tested as follows, each group of test samples is tested 3 times, and the average value is taken; the results are shown in Table 1.

[0037] Moisture absorption: the water absorption rate of the test sample is tested according to the national standard GB / T 21655.1-2008 "Evaluation of Moisture Absorption and Quick Drying of Textiles Part 1: Single Combination Test Method"; Air permeability: The air permeability of the sample was tested according to the national standard GB / T 5453-997 "Determination of air permeability of textile fabrics", the pressure was 100 Pa, the temperature was 20°C, and the relative humidity was 65%; Antibacterial property: The antibacterial property of the sample was tested according to the national standard GB / T 20944.3-2008 "Evaluation of antibacterial property of textiles Part 3: Oscillation method", and Staphylococcus aureus ATCC6538 was selected as the test strain; Bacterial adhesion resistance: The bacterial adhesion on the surface of the cotton fabric before and after finishing was observed by scanning electron microscopy, and the bacterial adhesion resistance of the anti-adhesion fabric was tested by using Staphylococcus aureus, and the anti-adhesion rate was calculated according to the following formula: Anti-adhesion rate = (A-B) / A x 100%, wherein A and B represent the total number of bacteria adhered to the untreated fabric and the treated fabric, respectively; Hydrophobicity detection: The water contact angle was tested at room temperature by randomly selecting 5 positions on the surface of the fabric, and the volume of each droplet was 3 μL.

[0038] Table 1 Test results Item Anti-sticking rate / % Antibacterial rate / % Air permeability rate / mm / s Water absorption rate / % Water contact angle / ° Example 1 99.99 99.99 935.2 267.2 120 Example 2 99.99 99.99 938.7 269.3 123 Example 3 99.99 99.99 945.6 273.6 126 Comparative Example 1 99.23 99.01 865.2 145.6 125 Comparative Example 2 99.56 99.42 923.6 267.8 98 Comparative Example 3 98.71 98.23 928.7 269.3 115 Comparative Example 4 73.35 99.67 932.5 268.3 90 Comparative Example 5 98.62 98.83 924.7 265.7 116 Comparative Example 6 99.14 99.35 931.5 267.2 119 From the data in Table 1, it can be seen that: 1) The air-permeable antibacterial fabric prepared in Examples 1-3 has excellent long-lasting antibacterial property, air permeability, moisture absorption, and better hydrophobic effect, bacterial adhesion resistance, etc.

[0039] 2) The performance comparison analysis of the air-permeable antibacterial fabric prepared in Example 3 and Comparative Example 1 shows that the modified polyester fiber prepared in the present application contains a large number of hydrophilic urethane groups, which changes the problem of few polar groups in the polyester molecule and effectively improves the hydrophilicity of the polyester fiber. After the human body excretes sweat, the polyester fiber will adsorb the sweat on its surface, and the ramie fiber structure has a groove-like cavity with many pore walls, so the air permeability is good. The sweat adsorbed on the surface of the polyester fiber can be discharged through the pores of the ramie fiber, thereby evaporating the sweat, so that the fabric has the effect of moisture absorption and sweat release, thereby keeping the skin surface dry and improving the comfort of the fabric.

[0040] 3) The performance comparison analysis of the air-permeable antibacterial fabric prepared in Example 3 and Comparative Example 2 shows that the modified terpineol prepared in the present application improves its thermal stability and biocompatibility by introducing polyacrylate copolymer and methacrylic acid polyethylene glycol ester, etc. At the same time, the stereo structure of the modified terpineol affects the perception system of bacteria, so that the bacteria do not adhere to the surface of the fabric, thereby giving the fabric excellent antibacterial adhesion resistance. As a hydrophobic antibacterial agent, the stereo structure of the modified terpineol and the introduced polyacrylate copolymer and other components work together to improve the antibacterial property and hydrophobic effect of the fabric.

[0041] 4) The performance comparison analysis of the breathable antibacterial fabric prepared by combining Example 3 and Comparative Example 3-Comparative Example 4 shows that the modified terpineol and the carbon nanotube composite long-acting antibacterial agent jointly act to improve the antibacterial performance, bacterial adhesion resistance and hydrophobicity of the breathable antibacterial fabric.

[0042] 5) The performance comparison analysis of the breathable antibacterial fabric prepared by combining Example 3 and Comparative Example 5-Comparative Example 6 shows that the silane coupling agent is composed of vinyl trimethoxysilane and N-β-(aminoethyl)-γ-aminopropyl methyl dimethoxysilane in a mass ratio of 4:3, and the use of the synergistic effect between them further improves the comprehensive performance of the breathable antibacterial fabric.

[0043] The above examples are only used to explain the technical solutions of the present application and not to limit them. Although the above examples have been specifically described, relevant technicians should understand that the specific embodiments of the present application can still be modified or replaced by equivalents without departing from the spirit and scope of the present application. Any modification and equivalent replacement should be covered in the protection scope of the present application.

Claims

1. A method for preparing a breathable antibacterial fabric, characterized in that: The following steps are involved: S1, according to the weight ratio, 75-85 parts of modified polyester fiber and 15-25 parts of ramie fiber are spun into yarn using a spinning machine, and then fed into a weaving machine for weaving to form a grey fabric; S2, using a high-pressure jet overflow machine to desize and refine the grey cloth; S3, first padding the treated grey cloth with clean water, then shaping and drying it to obtain a fabric layer; S4. Place the fabric layer in the antibacterial liquid and fully shake and pad it to perform antibacterial finishing to obtain an antibacterial layer. After drying, a breathable antibacterial fabric is obtained, wherein the antibacterial liquid comprises the following substances in parts by weight: 10-12 parts of a hydrophobic antibacterial agent, 3-5 parts of a carbon nanotube composite long-acting antibacterial agent, 4-6 parts of a silane coupling agent, 10-12 parts of ethanol, and 75-80 parts of deionized water.

2. The method for preparing a breathable antibacterial fabric according to claim 1, characterized in that: In step S1, the method for preparing the modified polyester fiber comprises the following steps: S21, placing 10 parts by mass of polyester fiber in 130 parts by mass of a 10% sodium hydroxide solution in a water bath at 90-95°C for 40-50 minutes, then filtering, washing until neutral, and drying; S22, mix 8 parts of alkali-treated polyester fiber and 200 parts of 1,4-dioxane in parts by mass, then add 25 parts of isophorone diisocyanate and 0.2-0.3 parts of tin 2-ethylhexanoate, stir evenly, increase the temperature to 71-75°C, react for 3.5-4 hours, and after completion of the reaction, remove the solvent by distillation under reduced pressure to obtain modified polyester fiber.

3. The method for preparing a breathable antibacterial fabric according to claim 1, characterized in that: In step S2, the desizing and refining treatment is performed at a temperature of 110-120°C and for a time of 30-35 minutes.

4. The method for preparing a breathable antibacterial fabric according to claim 1, characterized in that: In step S4, the hydrophobic antibacterial agent is modified terpineol, and its preparation method is as follows: 50 parts of tetrahydrofuran, 6.3 parts of acrylic anhydride and 0.002 parts of 4-dimethylaminopyridine are added to the reactor in parts by mass, and stirred at a constant temperature of 73°C to obtain a mixed solution, 15.4 parts of terpineol are added to the mixed solution, and the reaction is continued to obtain an intermediate solution, 0.1 parts of sodium persulfate and 5.3 parts of polyethylene glycol methacrylate are added to the intermediate solution, and the polymerization reaction is carried out at 73°C for 6 hours, cooled, filtered, and the solid matter is retained. It is washed three times with ethanol and dried to obtain modified terpineol.

5. The method for preparing a breathable antibacterial fabric according to claim 1, characterized in that: In step S4, the method for preparing the carbon nanotube composite long-acting antibacterial agent comprises the following steps: S41, soaking 7 parts by mass of carbon nanotubes in 200 parts by mass of 85% sulfuric acid solution, heating to 80° C. and stirring for 60-70 minutes, filtering, washing with deionized water three times, and vacuum drying at 80° C. to constant weight to obtain pretreated carbon nanotubes; S42, after mixing the pretreated carbon nanotubes and anhydrous ethanol according to their mass fractions, add L-cysteine ​​and ultrasonically treat for 15-20 minutes, add the natural antibacterial agent and photoinitiator 1173 and mix, react under 365nm ultraviolet wavelength for 8-10 hours, then add silver nitrate, heat to 35°C and stir for 50-60 minutes, centrifuge to obtain the solid, wash, and vacuum dry at 50°C to constant weight to obtain a carbon nanotube composite long-acting antibacterial agent.

6. The method for preparing a breathable antibacterial fabric according to claim 5, characterized in that: In step S42, the mass ratio of the pretreated carbon nanotubes, anhydrous ethanol, L-cysteine, natural antibacterial agent, photoinitiator 1173 and silver nitrate is 20:70:4.5-5:8-9:0.35-0.38:2.5-3.

7. The method for preparing a breathable antibacterial fabric according to claim 5, characterized in that: In step S42, the natural antibacterial agent is composed of cardanol and eugenol in a mass ratio of 3:

2.

8. The method for preparing a breathable antibacterial fabric according to claim 1, characterized in that: In step S4, the silane coupling agent is composed of vinyltrimethoxysilane and N-β-(aminoethyl)-γ-aminopropylmethyldimethoxysilane in a mass ratio of 4:

3.

9. A breathable antibacterial fabric, characterized in that: The breathable antibacterial fabric is prepared by the preparation method of the breathable antibacterial fabric according to any one of claims 1 to 8.