Antibacterial deodorant fabric and preparation method thereof

Abstract

The application relates to the technical field of textile printing and dyeing, and particularly discloses an antibacterial and deodorizing fabric and a preparation method thereof. The antibacterial and deodorizing fabric provided by the application comprises first yarn loaded with coffee peel biochar and second yarn loaded with nonanoic acid-gamma-cyclodextrin inclusion compound. The functional components loaded in the first yarn and the second yarn of the antibacterial and deodorizing fabric are optimized, the coffee peel biochar is loaded in the first yarn and matched with the slow-release system of the nonanoic acid-gamma-cyclodextrin inclusion compound in the second yarn, and the antibacterial and deodorizing effects of the fabric are significantly improved through the synergistic cooperation.

Description

Technical Field

[0001] This invention relates to the field of textile printing and dyeing technology, and in particular to an antibacterial and deodorizing fabric and its preparation method. Background Technology

[0002] With the improvement of living standards, consumers' demand for antibacterial and deodorizing textiles has expanded from single medical protective equipment to everyday clothing, sports equipment, and home textiles. Currently, most mainstream antibacterial and deodorizing fabrics on the market rely on nano-silver-based inorganic antibacterial agents or single herbal extracts for their functionality. However, these technologies have gradually revealed limitations in practical applications: on the one hand, nano-silver materials are expensive and pose a risk of leaching and potential environmental impact during long-term use; on the other hand, traditional plant extracts are limited by thermal stability and wash fastness, and their functional durability often fails to meet the requirements of modern textiles. Furthermore, existing deodorizing technologies mostly focus on physical adsorption (such as activated carbon), lacking the ability to specifically chemically decompose or transform odor molecules such as ammonia and hydrogen sulfide, making them prone to adsorption saturation and secondary release.

[0003] To address the aforementioned issues, the industry has begun exploring the use of non-precious metal ions, natural polyphenol complexes, and porous mineral materials to construct novel functional systems. These materials are not only inexpensive and widely available, but also possess the potential for synergistic effects through multiple mechanisms. However, existing technologies often focus only on replacing single functional additives, neglecting the compatibility between functional components within the fabric. Therefore, there is an urgent need to provide a fabric that can simultaneously provide long-lasting antibacterial and highly effective deodorization to meet the market demand for high-performance, eco-friendly knitwear. Summary of the Invention

[0004] In view of this, the present invention provides an antibacterial and deodorizing fabric and a method for preparing the same.

[0005] To achieve the above-mentioned objectives, the present invention adopts the following technical solution: The present invention provides an antibacterial and deodorizing fabric, comprising a first yarn loaded with coffee fruit peel biochar and a second yarn loaded with nonanoic acid-γ-cyclodextrin inclusion complex.

[0006] The antibacterial and deodorizing fabric provided by this invention contains coffee fruit peel biochar that has undergone carbonization treatment. This biochar has a rich porous structure and a large specific surface area, which can capture odor molecules such as ammonia, hydrogen sulfide and volatile organic acids through physical adsorption. At the same time, the oxygen-containing functional groups such as phenolic hydroxyl groups and quinone groups retained in the coffee fruit peel biochar can disrupt the integrity of bacterial cell membranes, thereby improving the bactericidal and deodorizing properties of the first yarn.

[0007] The second yarn in the antibacterial and deodorizing fabric provided by this invention has the following advantages: on the one hand, nonanoic acid can neutralize alkaline odor through saponification; on the other hand, nonanoic acid can penetrate the phospholipid bilayer of bacterial cell membranes to change membrane permeability, thereby synergistically enhancing the antibacterial effect. The hydrophobic cavity of γ-cyclodextrin encapsulates nonanoic acid, which not only masks the irritating odor of nonanoic acid itself, but also achieves continuous deodorization and antibacterial effects of the fabric through the slow release of nonanoic acid.

[0008] In this invention, the coffee fruit biochar loaded on the first yarn preferentially adsorbs and retains odor molecules, creating a low-load environment for the slow-release sterilization of the nonanoic acid-γ-cyclodextrin inclusion complex in the second yarn; while the continuous release of nonanoic acid inhibits microbial metabolic odor production, reducing the adsorption pressure on the coffee fruit biochar. This invention achieves a synergistic effect by rationally designing the functional division of the first and second yarns, achieving excellent antibacterial and deodorizing capabilities without the need for antibacterial agents such as nano-silver and quaternary ammonium salts.

[0009] Preferably, the method for preparing the coffee fruit peel biochar includes the following steps: The coffee fruit peel is carbonized at 450~550℃ to obtain the coffee fruit peel biochar.

[0010] More preferably, the carbonization treatment time is 3 to 6 hours.

[0011] More preferably, the carbonization process is carried out in an inert atmosphere, preferably nitrogen.

[0012] Preferably, the particle size of the coffee fruit biochar is 20-50 nm.

[0013] Preferably, the method for preparing the first yarn includes the following steps: Coffee fruit biochar was dispersed in an aqueous solution of polyvinylpyrrolidone and the pH was adjusted to 4.5-5.5 to obtain a coffee fruit biochar dispersion. At 40~50℃, polyester filaments were impregnated in the coffee fruit peel biochar dispersion and dried to obtain the first yarn.

[0014] In the method for preparing the first yarn provided by this invention, polyvinylpyrrolidone and a weak acid environment work synergistically to enable coffee fruit peel biochar to be uniformly dispersed in the polyvinylpyrrolidone aqueous solution, ensuring the uniformity of subsequent loading; at the same time, the weak acid environment also helps to promote the adsorption and loading of coffee fruit peel biochar onto the surface of polyester filament, ensuring the loading amount; the method for preparing the first yarn provided by this invention does not require toxic solvents and is environmentally friendly and safe.

[0015] More preferably, the mass concentration of coffee fruit peel biochar in the coffee fruit peel biochar dispersion is 3% to 8%.

[0016] More preferably, the mass concentration of polyvinylpyrrolidone in the aqueous solution is 0.3% to 0.5%.

[0017] More preferably, the ratio of the polyester filament to the coffee fruit biochar dispersion is 1g:(20~40)mL.

[0018] Further preferably, after adjusting the pH to 4.5-5.5, a wetting agent is also added.

[0019] For example, the wetting agent is fatty alcohol polyoxyethylene ether, and the ratio of the wetting agent to the coffee fruit peel biochar dispersion is (0.5~1) g:1 L.

[0020] More preferably, the soaking time is 3 to 5 hours.

[0021] Preferably, the method for preparing the second yarn includes the following steps: Add γ-cyclodextrin to an aqueous ethanol solution, then add nonanoic acid, and keep warm at 40~60℃ to obtain a dispersion of nonanoic acid-γ-cyclodextrin inclusion complex. A crosslinking agent and sodium hypophosphite are added to the nonanoic acid-γ-cyclodextrin inclusion complex dispersion, followed by the addition of polyester filament. The mixture is then impregnated at 40-50°C, followed by heat treatment at 110-140°C and drying to obtain the second yarn.

[0022] The second yarn preparation method provided by this invention uses an ethanol-water solution as a medium to construct a nonanoic acid-γ-cyclodextrin inclusion complex in situ under mild conditions of 40-60°C, avoiding a complex pre-inclusion process. Subsequently, a crosslinking system of a crosslinking agent and sodium hypophosphite is introduced, and after impregnation and adsorption at 40-50°C, heat treatment is performed at 110-140°C to anchor the nonanoic acid-γ-cyclodextrin inclusion complex onto the yarn surface. The overall process is water-based and environmentally friendly, with mild temperature and no need for post-treatment with organic solvents, and features simple process and industrial feasibility.

[0023] More preferably, the ratio of the amount of γ-cyclodextrin to the aqueous ethanol solution is (10~15) g: 1000 mL.

[0024] More preferably, the mass concentration of the ethanol aqueous solution is 10% to 30%.

[0025] More preferably, the molar ratio of the γ-cyclodextrin to nonanoic acid is 1:(1~1.5).

[0026] More preferably, the heat preservation time is 2 to 4 hours.

[0027] More preferably, the polyester filament further includes the following pretreatment step: Untreated polyester filament and surfactant are added to an alkaline solution, soaked at 95-100°C, washed with water until neutral, and dried to obtain the polyester filament.

[0028] More preferably, the soaking time is 30-60 minutes.

[0029] More preferably, the alkaline solution is a sodium hydroxide solution.

[0030] More preferably, the ratio of the polyester filament to the alkaline solution is 1g:(20~40)mL, and the concentration of the alkaline solution is 10~12g / L.

[0031] More preferably, the ratio of the polyester filament to the surfactant is 1g:(0.2~0.5)mL.

[0032] More preferably, the surfactant is octadecyl dimethyl benzyl ammonium chloride.

[0033] More preferably, the ratio of the polyester filament to the nonanoic acid-γ-cyclodextrin inclusion complex dispersion is 1 g: (30~40) mL.

[0034] More preferably, the crosslinking agent is citric acid.

[0035] More preferably, the amount of crosslinking agent added is 3% to 8% of the mass of the polyester filament.

[0036] More preferably, the amount of sodium hypophosphite added is 1% to 3% of the mass of the polyester filament.

[0037] More preferably, the immersion time is 40-60 minutes.

[0038] More preferably, the heat treatment time is 5 to 8 minutes.

[0039] Preferably, the mass ratio of the first yarn to the second yarn is (30-40):(60-70).

[0040] Preferably, the first yarn has a specification of 30 to 220 dtex.

[0041] Preferably, the second yarn has a specification of 30 to 220 dtex.

[0042] More preferably, the first yarn has a specification of 56 dtex, 83 dtex, 111 dtex or 167 dtex.

[0043] More preferably, the second yarn has a specification of 56 dtex, 83 dtex, 111 dtex or 167 dtex.

[0044] This invention provides a method for preparing the above-mentioned antibacterial and deodorizing fabric, comprising the following steps: Using the first yarn and the second yarn as weaving yarns, an antibacterial and deodorizing fabric is obtained by weaving with a double rib weave.

[0045] The antibacterial and deodorizing fabric provided by this invention significantly improves antibacterial and deodorizing performance through the directional design of functional components in the yarn of the antibacterial and deodorizing fabric; moreover, its preparation method is simple and easy to industrialize. Detailed Implementation

[0046] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0047] In the embodiments and comparative examples of this invention, the polyester filament was purchased from Jiangsu Shenghong Technology Co., Ltd.

[0048] Example 1 This embodiment provides an antibacterial and deodorizing fabric, including a first yarn with a specification of 111 dtex and a second yarn with a specification of 111 dtex; The mass ratio of the first yarn to the second yarn is 30:70; The method for preparing the first yarn includes the following steps: S1. After washing and drying the coffee fruit peel, place it in a tube furnace and carbonize it at 500°C for 4 hours under a nitrogen atmosphere. After cooling, grind it to a particle size of 20~50nm to obtain coffee fruit peel biochar. S2. Prepare a 0.4% (w / w) aqueous solution of PVP-K30, disperse coffee fruit biochar in it, adjust the pH to 5 with acetic acid, and then add fatty alcohol polyoxyethylene ether AEO-7 at a ratio of 1g:1L to obtain a coffee fruit biochar dispersion; the mass concentration of coffee fruit biochar in the dispersion is 5%. S3. Add polyester filament to coffee fruit peel biochar dispersion at a ratio of 1g:30mL, soak at 45℃ for 4h, wash, dry, and obtain the first yarn. The method for preparing the second yarn includes the following steps: Step 1: Based on the ratio of γ-cyclodextrin to ethanol aqueous solution of 10g:1000mL, add γ-cyclodextrin to ethanol aqueous solution with a mass concentration of 10%, add nonanoic acid based on the molar ratio of γ-cyclodextrin to nonanoic acid of 1:1, keep warm at 50℃ for 4h to obtain nonanoic acid-γ-cyclodextrin inclusion complex dispersion. Step 2: Based on the ratio of polyester filament to sodium hydroxide solution of 1g:40mL and the ratio of polyester filament to octadecyl dimethyl benzyl ammonium chloride of 1g:0.5mL, add polyester filament and octadecyl dimethyl benzyl ammonium chloride to a 12g / L sodium hydroxide solution, soak at 100℃ for 60min, wash with water until neutral, and dry to obtain pretreated polyester filament; Step 3: Based on the following dosage ratios of pretreated polyester filament and nonanoic acid-γ-cyclodextrin inclusion complex dispersion (1g:40mL), the amount of citric acid added is 5% of the mass of the pretreated polyester filament, and the amount of sodium hypophosphite added is 3% of the mass of the pretreated polyester filament, citric acid and sodium hypophosphite are added to the nonanoic acid-γ-cyclodextrin inclusion complex dispersion, followed by the addition of the pretreated polyester filament. The mixture is then impregnated at 50°C for 60 minutes, followed by heat treatment at 120°C for 8 minutes, washed, and dried to obtain the second yarn. This embodiment provides a method for preparing the above-mentioned antibacterial and deodorizing fabric, including the following steps: Using the first and second yarns as weaving yarns, an interwoven fabric structure is formed by using an interwoven weave method to obtain an antibacterial and deodorizing fabric.

[0049] Example 2 This embodiment provides an antibacterial and deodorizing fabric, including a first yarn with a specification of 111 dtex and a second yarn with a specification of 111 dtex; The mass ratio of the first yarn to the second yarn is 40:60; The method for preparing the first yarn includes the following steps: S1. After washing and drying the coffee fruit peel, place it in a tube furnace and carbonize it at 550°C for 3 hours under a nitrogen atmosphere. After cooling, grind it to a particle size of 20~50nm to obtain coffee fruit peel biochar. S2. Prepare a 0.5% (w / w) aqueous solution of PVP-K30, disperse coffee fruit biochar in it, adjust the pH to 5.5 with acetic acid, and then add fatty alcohol polyoxyethylene ether AEO-7 at a ratio of 0.8 g:1 L to obtain a coffee fruit biochar dispersion; the mass concentration of coffee fruit biochar in the dispersion is 8%. S3. Add polyester filament to coffee fruit peel biochar dispersion at a ratio of 1g:40mL, soak at 50℃ for 3h, wash, dry, and obtain the first yarn. The method for preparing the second yarn includes the following steps: Step 1: Based on a ratio of 15g to 1000mL of γ-cyclodextrin to ethanol aqueous solution, add γ-cyclodextrin to 20% ethanol aqueous solution and add nonanoic acid based on a molar ratio of 1:1 of γ-cyclodextrin to nonanoic acid. Keep warm at 60℃ for 3h to obtain a nonanoic acid-γ-cyclodextrin inclusion complex dispersion. Step 2: Based on the ratio of polyester filament to sodium hydroxide solution of 1g:30mL and the ratio of polyester filament to octadecyl dimethyl benzyl ammonium chloride of 1g:0.4mL, add polyester filament and octadecyl dimethyl benzyl ammonium chloride to a 12g / L sodium hydroxide solution, soak at 100℃ for 50min, wash with water until neutral, and dry to obtain pretreated polyester filament; Step 3: Based on the following dosage ratios: 1g:30mL for pretreated polyester filament and nonanoic acid-γ-cyclodextrin inclusion complex dispersion, 8% of the mass of pretreated polyester filament and 2% of the mass of pretreated polyester filament, add citric acid and sodium hypophosphite to the nonanoic acid-γ-cyclodextrin inclusion complex dispersion, then add the pretreated polyester filament, impregnate at 40℃ for 50min, then heat treat at 130℃ for 6min, wash, and dry to obtain the second yarn; This embodiment provides a method for preparing the above-mentioned antibacterial and deodorizing fabric, including the following steps: Using the first and second yarns as weaving yarns, an interwoven fabric structure is formed by using an interwoven weave method to obtain an antibacterial and deodorizing fabric.

[0050] Example 3 This embodiment provides an antibacterial and deodorizing fabric, including a first yarn with a specification of 111 dtex and a second yarn with a specification of 111 dtex; The mass ratio of the first yarn to the second yarn is 30:70; The method for preparing the first yarn includes the following steps: S1. After washing and drying the coffee fruit peel, place it in a tube furnace and carbonize it at 500°C for 3 hours under a nitrogen atmosphere. After cooling, grind it to a particle size of 20~50nm to obtain coffee fruit peel biochar. S2. Prepare a 0.3% (w / w) aqueous solution of PVP-K30, disperse coffee fruit biochar in it, adjust the pH to 5.5 with acetic acid, and then add fatty alcohol polyoxyethylene ether AEO-7 at a ratio of 0.8 g:1 L to obtain a coffee fruit biochar dispersion; the mass concentration of coffee fruit biochar in the dispersion is 4%. S3. Add polyester filament to coffee fruit peel biochar dispersion at a ratio of 1g:35mL, soak at 50℃ for 3h, wash, dry, and obtain the first yarn. The method for preparing the second yarn includes the following steps: Step 1: Based on a ratio of 10g to 1000mL of γ-cyclodextrin to ethanol aqueous solution, add γ-cyclodextrin to 20% ethanol aqueous solution and add nonanoic acid based on a molar ratio of 1:1.2 of γ-cyclodextrin to nonanoic acid. Keep warm at 55℃ for 3h to obtain a dispersion of nonanoic acid-γ-cyclodextrin inclusion complex. Step 2: Based on the ratio of polyester filament to sodium hydroxide solution of 1g:35mL and the ratio of polyester filament to octadecyl dimethyl benzyl ammonium chloride of 1g:0.4mL, add polyester filament and octadecyl dimethyl benzyl ammonium chloride to a 12g / L sodium hydroxide solution, soak at 100℃ for 50min, wash with water until neutral, and dry to obtain pretreated polyester filament; Step 3: Based on the following dosage ratios: 1g:30mL for pretreated polyester filament and nonanoic acid-γ-cyclodextrin inclusion complex dispersion, 6% of the mass of pretreated polyester filament and 2% of the mass of pretreated polyester filament, add citric acid and sodium hypophosphite to the nonanoic acid-γ-cyclodextrin inclusion complex dispersion, then add the pretreated polyester filament, impregnate at 40℃ for 50min, then heat treat at 120℃ for 6min, wash, and dry to obtain the second yarn; This embodiment provides a method for preparing the above-mentioned antibacterial and deodorizing fabric, including the following steps: Using the first and second yarns as weaving yarns, an interwoven fabric structure is formed by using an interwoven weave method to obtain an antibacterial and deodorizing fabric.

[0051] Comparative Example 1 This comparative example provides an antibacterial and deodorizing fabric, which differs from Example 1 in that nonanoic acid is replaced with an equal amount of acetic acid; The remaining preparation steps are the same as in Example 1.

[0052] Comparative Example 2 This comparative example provides an antibacterial and deodorizing fabric, which differs from Example 1 in that coffee fruit peel biochar is replaced with an equal amount of coconut shell activated carbon; the coconut shell activated carbon was purchased from Xinsen Charcoal Industry SAC-02X. The remaining preparation steps are the same as in Example 1.

[0053] The antibacterial and deodorizing fabrics provided in the embodiments and comparative examples of the present invention were tested, and the specific test indicators and test methods are as follows: 1. Antibacterial performance test: According to the testing standard FZ / T 73023-2006, the antibacterial and deodorizing fabrics prepared in this embodiment and the comparative example were subjected to antibacterial tests after being washed 10, 30 and 50 times. 2. Deodorization performance test: The deodorization performance of the antibacterial and deodorizing fabrics prepared in this example and the comparative example was tested according to the test method of ISO 17299-1-2014 "Determination of deodorization properties of textiles - Part 1". The specific test results are shown in Table 1: Table 1 As shown in Table 1, after 50 washes, the antibacterial and deodorizing fabric provided in this embodiment of the invention exhibits an antibacterial rate greater than 94% against Staphylococcus aureus, Candida albicans, and Escherichia coli, and a deodorization rate greater than 80%. In Comparative Example 1, because nonanoic acid was replaced with an equal amount of acetic acid, the acetic acid had poor compatibility with the hydrophobic cavities of γ-cyclodextrin, making it difficult to stably load and slowly release on the fiber surface, thus significantly reducing the antibacterial and deodorizing rates. In Comparative Example 2, because coffee fruit peel biochar was replaced with an equal amount of coconut shell activated carbon, the coconut shell activated carbon relied solely on physical adsorption, significantly reducing the antibacterial and deodorizing rates.

[0054] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions or improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An antibacterial and deodorizing fabric, characterized in that, It includes a first yarn loaded with coffee pericarp biochar and a second yarn loaded with nonanoic acid-γ-cyclodextrin inclusion complex.

2. The antibacterial and deodorizing fabric as described in claim 1, characterized in that, The method for preparing coffee fruit peel biochar includes the following steps: The coffee fruit peel is carbonized at 450~550℃ to obtain the coffee fruit peel biochar.

3. The antibacterial and deodorizing fabric as described in claim 2, characterized in that, The carbonization process takes 3-6 hours. The particle size of the coffee fruit biochar is 20-50 nm.

4. The antibacterial and deodorizing fabric as described in claim 1, characterized in that, The method for preparing the first yarn includes the following steps: Coffee fruit biochar was dispersed in an aqueous solution of polyvinylpyrrolidone and the pH was adjusted to 4.5-5.5 to obtain a coffee fruit biochar dispersion. At 40~50℃, polyester filaments were impregnated in the coffee fruit peel biochar dispersion and dried to obtain the first yarn.

5. The antibacterial and deodorizing fabric as described in claim 4, characterized in that, The mass concentration of coffee fruit peel biochar in the coffee fruit peel biochar dispersion is 3%~8%; The polyvinylpyrrolidone aqueous solution contains polyvinylpyrrolidone at a mass concentration of 0.3% to 0.5%. The ratio of the polyester filament to the coffee fruit biochar dispersion is 1g:(20~40)mL; The soaking time is 3 to 5 hours.

6. The antibacterial and deodorizing fabric as described in claim 1, characterized in that, The method for preparing the second yarn includes the following steps: Add γ-cyclodextrin to an aqueous ethanol solution, then add nonanoic acid, and keep warm at 40~60℃ to obtain a dispersion of nonanoic acid-γ-cyclodextrin inclusion complex. A crosslinking agent and sodium hypophosphite are added to the nonanoic acid-γ-cyclodextrin inclusion complex dispersion, followed by the addition of polyester filament. The mixture is then impregnated at 40-50°C, followed by heat treatment at 110-140°C and drying to obtain the second yarn.

7. The antibacterial and deodorizing fabric as described in claim 6, characterized in that, The ratio of γ-cyclodextrin to ethanol aqueous solution is (10~15) g:1000 mL, and the mass concentration of ethanol aqueous solution is 10%~30%. The molar ratio of γ-cyclodextrin to nonanoic acid is 1:(1~1.5). The heat preservation time is 2-4 hours.

8. The antibacterial and deodorizing fabric as described in claim 6, characterized in that, The ratio of the amount of the polyester filament to the nonanoic acid-γ-cyclodextrin inclusion complex dispersion is 1 g: (30~40) mL; The crosslinking agent is citric acid.

9. The antibacterial and deodorizing fabric as described in claim 6, characterized in that, The amount of crosslinking agent added is 3% to 8% of the mass of the polyester filament; The amount of sodium hypophosphite added is 1% to 3% of the mass of the polyester filament; The immersion time is 40-60 minutes; The heat treatment time is 5-8 minutes; The mass ratio of the first yarn to the second yarn is (30-40):(60-70).

10. A method for preparing the antibacterial and deodorizing fabric according to any one of claims 1 to 9, characterized in that, Includes the following steps: Using the first yarn and the second yarn as weaving yarns, an antibacterial and deodorizing fabric is obtained by weaving with a double rib weave.

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