Antibacterial deodorizing fabric and preparation method thereof

Abstract

The invention relates to the technical field of functional fabrics, and discloses an antibacterial and deodorant fabric and a preparation method thereof.The preparation method specifically comprises the steps that based on the esterification reaction and click reaction mechanism, sulfydryl functionalized vanillin is prepared from vanillin, acryloyl chloride and octa-sulfydryl POSS as raw materials; the preparation method comprises the following steps: carrying out a Schiff base reaction on an amino group in aminated silica gel and an aldehyde group in sulfydryl functionalized vanillin, and loading silver ions by virtue of a strong coordination effect of the sulfydryl group and the silver ions and a porous structure of silica gel, so as to prepare silver-loaded silica gel; silver-loaded silica gel is placed in deionized water, and antibacterial dispersion liquid is prepared; the cotton fabric is sequentially soaked in the antibacterial dispersion liquid and the chitosan solution, and the antibacterial deodorization fabric is prepared. The antibacterial and deodorizing fabric prepared by the preparation method disclosed by the invention has excellent antibacterial performance and deodorizing effect, and the antibacterial and deodorizing fabric prepared by adding the catechol type silver-loaded silica gel has excellent long-acting antibacterial performance.

Description

Technical Field

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

[0002] With the development of society and the economy and the improvement of people's living standards, textiles have rapidly evolved from their single function of providing warmth and covering the body to a focus on comfort, health, and multifunctionality. In fields such as clothing, home textiles, and medical supplies that come into close contact with the human body, the hygiene performance of textiles is receiving increasing attention from consumers. Textiles, especially natural fiber fabrics such as cotton, are highly favored for their excellent moisture absorption and breathability. However, these characteristics also make them ideal breeding grounds for microorganisms. Human sweat, sebum, and shed skin cells provide a suitable growth environment for pathogenic bacteria such as Escherichia coli and Staphylococcus aureus. The volatile organic compounds produced by these bacteria's metabolism can create unpleasant odors and may also cause skin itching, inflammation, and other discomforts, especially during exercise or in hot and humid environments. In home textiles and medical fabrics, cross-contamination of microorganisms can also pose potential public health risks. Therefore, developing antibacterial and deodorizing fabrics that combine highly effective antibacterial and deodorizing functions while retaining the original comfort properties of the fabric has become a research hotspot and market demand trend in the textile industry.

[0003] Currently, the main technologies for preparing antibacterial and deodorizing fabrics include fiber blending spinning, coating finishing, and impregnation modification. Fiber blending spinning requires blending antibacterial agents with fiber raw materials before spinning, resulting in uniform distribution of functional components, but the process is complex and costly. Coating finishing achieves modification by coating functional films, which is simple to operate but easily leads to decreased fabric breathability and a stiff feel. After long-term use, the coating is prone to peeling off, causing rapid functional degradation. In contrast, impregnation modification has become the most widely used finishing technology due to its simple process, low cost, minimal damage to the original properties of the substrate, and ability to achieve deep integration of functional components with the fabric. Its core is to immerse the fabric in a functional dispersion solution, allowing the functional components to be fixed on the fiber surface and inside through physical adsorption or chemical action.

[0004] Traditional antibacterial agents mainly include three categories: organic antibacterial agents, inorganic antibacterial agents, and natural antibacterial agents. Among them, organic antibacterial agents, such as quaternary ammonium salts and phenolic compounds, have the advantages of rapid antibacterial action and broad bactericidal spectrum, but they also have drawbacks such as high toxicity, easy volatility, poor heat resistance, and easy bacterial resistance with long-term use. Natural antibacterial agents, such as plant extracts and chitosan, have the advantages of good biocompatibility and environmental friendliness, but their antibacterial activity is weak and their stability is poor, making it difficult to meet the requirements of long-term antibacterial effect. Among inorganic antibacterial agents, silver ions have become one of the most widely used antibacterial agents due to their outstanding advantages such as broad-spectrum antibacterial activity, high antibacterial efficiency, low tendency to induce drug resistance, and good safety. Summary of the Invention

[0005] Based on molecular design mechanisms, this invention designs and synthesizes a novel thiol-functionalized vanillin. This thiol-functionalized vanillin is introduced into silica gel and further coordinates with silver ions. The silica gel is then placed in deionized water to obtain an antibacterial dispersion. Finally, cotton fabric is sequentially immersed in the antibacterial dispersion and chitosan solution to obtain an antibacterial and deodorizing fabric with excellent antibacterial properties and deodorizing effects.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A method for preparing an antibacterial and deodorizing fabric includes the following steps:

[0008] Step 1: Synthesize mercapto-functionalized vanillin;

[0009] Step 2: Preparation of silver-loaded silica gel: Silver ions are loaded by the Schiff base reaction between the amino groups in the amino-modified silica gel and the aldehyde groups in the mercapto-functionalized vanillin, and by the strong coordination between the mercapto groups and silver ions and the porous structure of the silica gel.

[0010] Step 3: Place the silica gel in deionized water to prepare an antibacterial dispersion; immerse cotton fabric in the antibacterial dispersion and chitosan solution in sequence to prepare an antibacterial and deodorizing fabric.

[0011] Preferably, the silver-loaded silica gel is a catechol-type silver-loaded silica gel, which is prepared by: reacting the amino groups in the aminated silica gel with the aldehyde groups in the mercapto-functionalized vanillin and 3,4-dihydroxybenzaldehyde through a Schiff base reaction, and loading silver ions through the strong coordination between the mercapto groups and silver ions and the porous structure of the silica gel, thereby preparing the catechol-type silver-loaded silica gel.

[0012] Preferably, the method for preparing the thiol-functionalized vanillin is as follows:

[0013] Under the action of an acid-binding agent, alkenylated vanillin is prepared by reacting the hydroxyl group in 1 molar equivalent of vanillin with the acyl chloride group in 1 molar equivalent of acryloyl chloride.

[0014] Based on the thiol-alkene click reaction mechanism, 1 molar equivalent of alkenyl vanillin reacts with 1 molar equivalent of octamercaptoPOSS under photoinitiator and ultraviolet light irradiation to prepare thiol-functionalized vanillin.

[0015] Preferably, the acid-binding agent is one of triethylamine and pyridine.

[0016] Preferably, the photoinitiator is one of benzoin dimethyl ether, benzoin isopropyl ether, and benzoin ethyl ether.

[0017] Preferably, the chitosan solution is prepared by adding chitosan to an acetic acid solution and mechanically stirring for 25-35 minutes to obtain the chitosan solution.

[0018] Preferably, the fabric has an antibacterial rate of greater than 99% and an ammonia removal rate of greater than 80% when unwashed.

[0019] Preferably, the average diameter of the silicone is 5 μm.

[0020] Preferably, the solid content of the antibacterial dispersion is 20-40%.

[0021] Preferably, the chitosan solution has a mass fraction of 1-3%.

[0022] The beneficial effects of this invention are as follows:

[0023] Under the action of pyridine, vanillin is prepared by reacting the hydroxyl group in vanillin with the acyl chloride group in acryloyl chloride; under the initiator of benzoin dimethyl ether and irradiation of ultraviolet light, thiol-functionalized vanillin is prepared by a "thiol-alkene" click chemical reaction between the alkenyl functional group in the alkenyl vanillin and the thiol group in octamercapto-POSS.

[0024] Aminated silica gel was prepared by modifying silica gel with 3-aminopropyltriethoxysilane; silver-loaded silica gel was prepared by Schiff base reaction between the amino groups in the aminated silica gel and the aldehyde groups in the mercapto-functionalized vanillin, and by loading silver ions through the strong coordination between the mercapto groups and silver ions and the porous structure of silica gel.

[0025] The catechol-type silver-loaded silica gel is prepared by reacting the amino groups in the amino-functionalized vanillin and the aldehyde groups in the thiol-functionalized vanillin and 3,4-dihydroxybenzaldehyde with the aldehyde groups, and by loading silver ions through the strong coordination between the thiol groups and silver ions and the porous structure of the silica gel.

[0026] First, place catechol-type silver-loaded silica gel or silver-loaded silica gel in deionized water to prepare an antibacterial dispersion. Then, add chitosan to acetic acid solution and mechanically stir for 25-35 minutes to prepare a chitosan solution. Finally, soak cotton fabric in the antibacterial dispersion and chitosan solution in turn to prepare an antibacterial and deodorizing fabric.

[0027] Experimental results demonstrate that the antibacterial and deodorizing fabric prepared by this invention possesses excellent antibacterial properties and deodorizing effects; the antibacterial and deodorizing fabric prepared by adding catechol-type silver-loaded silica gel possesses excellent long-lasting antibacterial properties. Detailed Implementation

[0028] Example 1:

[0029] The preparation of thiol-functionalized vanillin includes the following steps:

[0030] Step S1: Preparation of alkenyl vanillin. The preparation mechanism is as follows: alkenyl vanillin is prepared by reacting the hydroxyl group in vanillin with the acyl chloride group in acryloyl chloride. The specific experimental steps are as follows: 7.61g of vanillin is added to 70mL of dichloromethane and stirred until dissolved. 4g of pyridine is added, and 20mL of dichloromethane solution containing 4.53g of acryloyl chloride is added dropwise over 30min. After the addition is complete, the temperature is raised to 40℃ and the reaction is carried out for 5h. After the reaction is complete, the solvent is removed by rotary evaporation, washed, recrystallized, and vacuum dried at 50℃ for 10h to obtain alkenyl vanillin.

[0031] Step S2: Preparation of thiol-functionalized vanillin. The preparation mechanism is as follows: thiol-functionalized vanillin is prepared by a click reaction between the alkenyl functional group in alkenylized vanillin and the thiol group in octamercapto-POSS. The specific experimental steps are as follows: 250 mL of anhydrous methanol and 10 mL of 3-mercaptopropyltrimethoxysilane are added to a 500 mL three-necked flask and stirred magnetically until homogeneous. 20 mL of 37% concentrated hydrochloric acid is added dropwise. After the addition is complete, the system temperature is raised to 90 °C and the reaction is carried out for 24 h. After the reaction is completed, the reaction solution is cooled to room temperature and placed in a refrigerator overnight. The supernatant is removed, the crude product is washed, recrystallized, and dried in a vacuum drying oven at 60 °C to constant weight to prepare octamercapto-POSS.

[0032] 10.2 g of octamercaptoPOSS and 2.1 g of alkenyl vanillin were added to 100 mL of toluene and mechanically stirred until homogeneous. 0.1 g of benzoin dimethyl ether was added, and the mixture was stirred and reacted under ultraviolet light (365 nm) for 1 h. After the reaction was completed, the solvent was removed by rotary evaporation, and the mixture was washed and dried under vacuum at 60 °C for 3 h to prepare thiol-functionalized vanillin.

[0033] The chemical structural formula of mercapto-functionalized vanillin is:

[0034] .

[0035] Example 2:

[0036] (1) Preparation of silver-loaded silicone, including the following steps:

[0037] Step SS1: Add 5g of silica gel (average diameter 5μm) to the reactor, add 5% hydrochloric acid solution (30mL) while stirring, raise the temperature to 90℃, activate for 4h, then wash with distilled water and filter until the filtrate is neutral (pH=7), dry in an oven at 80℃ to constant weight to prepare activated silica gel.

[0038] 1.4 mL of 3-aminopropyltriethoxysilane was added to 12.6 mL of hydrochloric acid solution at pH 3.5 to hydrolyze the 3-aminopropyltriethoxysilane in hydrochloric acid. Then, 1 g of activated silica gel was added, and the mixture was reacted in a constant temperature water bath at 80 °C for 2 h. After the reaction was completed, the mixture was washed, filtered, and dried in a vacuum drying oven at 80 °C for 5 h to prepare aminated silica gel.

[0039] Step SS2: Under nitrogen protection, 3g of amino-modified silica gel was added to 150mL of toluene and ultrasonically dispersed for 30min. Then, 24g of mercapto-functionalized vanillin was added and mechanically stirred until homogeneous. The system temperature was raised to 60℃ and reacted for 7h. After the reaction was completed, toluene was removed by rotary evaporation, washed, and dried in an oven at 60℃ for 12h to prepare mercapto-modified catechol-type silica gel.

[0040] Step SS3: Place 2g of mercapto-catechin silica gel in 20mL of deionized water, disperse it evenly by ultrasonication, add 10mL of 1mol / L AgNO3 solution, stir and react for 3h. After the reaction is complete, filter, wash, and vacuum dry at 50℃ for 8h to prepare silver-loaded silica gel.

[0041] (2) Preparation of catechol-type silver-loaded silica gel, including the following steps:

[0042] Step SS1: Add 5g of silica gel (average diameter 5μm) to the reactor, add 5% hydrochloric acid solution (30mL) while stirring, raise the temperature to 90℃, activate for 4h, then wash with distilled water and filter until the filtrate is neutral (pH=7), dry in an oven at 80℃ to constant weight to prepare activated silica gel.

[0043] 1.4 mL of 3-aminopropyltriethoxysilane was added to 12.6 mL of hydrochloric acid solution at pH 3.5 to hydrolyze the 3-aminopropyltriethoxysilane in hydrochloric acid. Then, 1 g of activated silica gel was added, and the mixture was reacted in a constant temperature water bath at 80 °C for 2 h. After the reaction was completed, the mixture was washed, filtered, and dried in a vacuum drying oven at 80 °C for 5 h to prepare aminated silica gel.

[0044] Step SS2: Under nitrogen protection, 3g of amino-modified silica gel was added to 150mL of toluene and ultrasonically dispersed for 30min. Then, 24g of mercapto-functionalized vanillin and 1.3g of 3,4-dihydroxybenzaldehyde were added and mechanically stirred until homogeneous. The system temperature was raised to 60℃ and the reaction was carried out for 7h. After the reaction was completed, toluene was removed by rotary evaporation, washed, and dried in an oven at 60℃ for 12h to prepare mercapto-modified catechol-type silica gel.

[0045] Step SS3: Place 2g of mercapto-catenin-type silica gel in 20mL of deionized water, disperse it evenly by ultrasonication, add 10mL of 1mol / L AgNO3 solution, stir and react for 3h. After the reaction is completed, filter, wash, and vacuum dry at 50℃ for 8h to prepare catechol-type silver-loaded silica gel.

[0046] Example 3:

[0047] The preparation of antibacterial and deodorizing fabric I includes the following steps:

[0048] Step 1: Add 30g of catechol-type silver-loaded silica gel to 100mL of deionized water, and ultrasonically disperse until uniform to prepare an antibacterial dispersion;

[0049] Add 2g of chitosan to 100mL of 0.2% acetic acid solution and stir mechanically for 30min to prepare chitosan solution;

[0050] Step 2: Cut the 10×10cm 2 The cotton fabric (plain weave, with warp and weft yarns of 15 tex, warp and weft densities of 520 threads / 10cm and 280 threads / 10cm respectively, and a weight of 110 g / m²) is described. 2 The cotton fabric was soaked in an antibacterial dispersion for 5 minutes, then removed and air-dried. The dried cotton fabric was then soaked in a chitosan solution for 5 minutes, then removed and air-dried to obtain antibacterial and deodorizing fabric I.

[0051] Example 4:

[0052] The preparation of antibacterial and deodorizing fabric II includes the following steps:

[0053] Step 1: Add 30g of silver-loaded silica gel to 100mL of deionized water and ultrasonically disperse until uniformly dispersed to prepare an antibacterial dispersion;

[0054] Add 2g of chitosan to 100mL of 0.2% acetic acid solution and stir mechanically for 30min to prepare chitosan solution;

[0055] Step 2: Cut the 10×10cm 2 The cotton fabric (plain weave, with warp and weft yarns of 15 tex, warp and weft densities of 520 threads / 10cm and 280 threads / 10cm respectively, and a weight of 110 g / m²) is described. 2 The cotton fabric was soaked in an antibacterial dispersion for 5 minutes, then removed and air-dried. The dried cotton fabric was then soaked in a chitosan solution for 5 minutes, then removed and air-dried to obtain antibacterial and deodorizing fabric II.

[0056] Example 5:

[0057] The preparation of antibacterial and deodorizing fabric III includes the following steps:

[0058] Step 1: Add 35g of catechol-type silver-loaded silica gel to 100mL of deionized water, and ultrasonically disperse evenly to prepare an antibacterial dispersion;

[0059] Add 2g of chitosan to 100mL of 0.2% acetic acid solution and stir mechanically for 30min to prepare chitosan solution;

[0060] Step 2: Cut the 10×10cm 2 The cotton fabric (plain weave, with warp and weft yarns of 15 tex, warp and weft densities of 520 threads / 10cm and 280 threads / 10cm respectively, and a weight of 110 g / m²) is described. 2 The cotton fabric was soaked in an antibacterial dispersion for 5 minutes, then removed and air-dried. The dried cotton fabric was then soaked in a chitosan solution for 5 minutes, then removed and air-dried to obtain antibacterial and deodorizing fabric III.

[0061] Example 6:

[0062] The preparation of antibacterial and deodorizing fabric IV includes the following steps:

[0063] Step 1: Add 35g of silver-loaded silica gel to 100mL of deionized water and ultrasonically disperse until uniformly dispersed to prepare an antibacterial dispersion;

[0064] Add 2g of chitosan to 100mL of 0.2% acetic acid solution and stir mechanically for 30min to prepare chitosan solution;

[0065] Step 2: Cut the 10×10cm 2 The cotton fabric (plain weave, with warp and weft yarns of 15 tex, warp and weft densities of 520 threads / 10cm and 280 threads / 10cm respectively, and a weight of 110 g / m²) is described. 2 The cotton fabric was soaked in an antibacterial dispersion for 5 minutes, then removed and air-dried. The dried cotton fabric was then soaked in a chitosan solution for 5 minutes, then removed and air-dried to obtain antibacterial and deodorizing fabric IV.

[0066] Example 7:

[0067] The preparation of antibacterial and deodorizing fabric V includes the following steps:

[0068] Step 1: Add 40g of catechol-type silver-loaded silica gel to 100mL of deionized water, and ultrasonically disperse until uniform to prepare an antibacterial dispersion;

[0069] Add 2g of chitosan to 100mL of 0.2% acetic acid solution and stir mechanically for 30min to prepare chitosan solution;

[0070] Step 2: Cut the 10×10cm 2 The cotton fabric (plain weave, with warp and weft yarns of 15 tex, warp and weft densities of 520 threads / 10cm and 280 threads / 10cm respectively, and a weight of 110 g / m²) is described. 2 The cotton fabric was soaked in an antibacterial dispersion for 5 minutes, then removed and air-dried. The dried cotton fabric was then soaked in a chitosan solution for 5 minutes, then removed and air-dried to obtain antibacterial and deodorizing fabric V.

[0071] Example 8:

[0072] The preparation of antibacterial and deodorizing fabric VI includes the following steps:

[0073] Step 1: Add 40g of silver-loaded silica gel to 100mL of deionized water and ultrasonically disperse until uniformly dispersed to prepare an antibacterial dispersion;

[0074] Add 2g of chitosan to 100mL of 0.2% acetic acid solution and stir mechanically for 30min to prepare chitosan solution;

[0075] Step 2: Cut the 10×10cm 2 The cotton fabric (plain weave, with warp and weft yarns of 15 tex, warp and weft densities of 520 threads / 10cm and 280 threads / 10cm respectively, and a weight of 110 g / m²) is described. 2 The cotton fabric was soaked in an antibacterial dispersion for 5 minutes, then removed and air-dried. The dried cotton fabric was then soaked in a chitosan solution for 5 minutes, then removed and air-dried to obtain antibacterial and deodorizing fabric VI.

[0076] Example 8:

[0077] The preparation of antibacterial and deodorizing fabric VII includes the following steps:

[0078] Step 1: Add 45g of catechol-type silver-loaded silica gel to 100mL of deionized water, and ultrasonically disperse until uniform to prepare an antibacterial dispersion;

[0079] Add 2g of chitosan to 100mL of 0.2% acetic acid solution and stir mechanically for 30min to prepare chitosan solution;

[0080] Step 2: Cut the 10×10cm 2The cotton fabric (plain weave, with warp and weft yarns of 15 tex, warp and weft densities of 520 threads / 10cm and 280 threads / 10cm respectively, and a weight of 110 g / m²) is described. 2 The cotton fabric was soaked in an antibacterial dispersion for 5 minutes, then removed and air-dried. The dried cotton fabric was then soaked in a chitosan solution for 5 minutes, then removed and air-dried to obtain antibacterial and deodorizing fabric VII.

[0081] Example 9:

[0082] The preparation of antibacterial and deodorizing fabric VIII includes the following steps:

[0083] Step 1: Add 45g of silver-loaded silica gel to 100mL of deionized water and ultrasonically disperse until uniformly dispersed to prepare an antibacterial dispersion;

[0084] Add 2g of chitosan to 100mL of 0.2% acetic acid solution and stir mechanically for 30min to prepare chitosan solution;

[0085] Step 2: Cut the 10×10cm 2 The cotton fabric (plain weave, with warp and weft yarns of 15 tex, warp and weft densities of 520 threads / 10cm and 280 threads / 10cm respectively, and a weight of 110 g / m²) is described. 2 The cotton fabric was soaked in an antibacterial dispersion for 5 minutes, then removed and air-dried. The dried cotton fabric was then soaked in a chitosan solution for 5 minutes, then removed and air-dried to obtain antibacterial and deodorizing fabric VIII.

[0086] Example 10:

[0087] The preparation of antibacterial and deodorizing fabric IX includes the following steps:

[0088] Step 1: Add 50g of catechol-type silver-loaded silica gel to 100mL of deionized water and ultrasonically disperse until uniformly dispersed to prepare an antibacterial dispersion;

[0089] Add 2g of chitosan to 100mL of 0.2% acetic acid solution and stir mechanically for 30min to prepare chitosan solution;

[0090] Step 2: Cut the 10×10cm 2 The cotton fabric (plain weave, with warp and weft yarns of 15 tex, warp and weft densities of 520 threads / 10cm and 280 threads / 10cm respectively, and a weight of 110 g / m²) is described. 2 The cotton fabric was soaked in an antibacterial dispersion for 5 minutes, then removed and air-dried. The dried cotton fabric was then soaked in a chitosan solution for 5 minutes, then removed and air-dried to obtain antibacterial and deodorizing fabric IX.

[0091] Example 11:

[0092] The preparation of antibacterial and deodorizing fabric X includes the following steps:

[0093] Step 1: Add 50g of silver-loaded silica gel to 100mL of deionized water and ultrasonically disperse until uniformly dispersed to prepare an antibacterial dispersion;

[0094] Add 2g of chitosan to 100mL of 0.2% acetic acid solution and stir mechanically for 30min to prepare chitosan solution;

[0095] Step 2: Cut the 10×10cm 2 The cotton fabric (plain weave, with warp and weft yarns of 15 tex, warp and weft densities of 520 threads / 10cm and 280 threads / 10cm respectively, and a weight of 110 g / m²) is described. 2 The cotton fabric was soaked in an antibacterial dispersion for 5 minutes, then removed and air-dried. The dried cotton fabric was then soaked in a chitosan solution for 5 minutes, then removed and air-dried to obtain antibacterial and deodorizing fabric X.

[0096] Performance testing:

[0097] I. Antibacterial Performance Test: The antibacterial rate of unwashed fabric and fabric after 50 washes was tested according to GB / T 20944.3-2008 "Evaluation of Antibacterial Properties of Textiles - Part 3: Shaking Method". The washing method was the same as that of a household twin-tub washing machine. The test bacteria was Escherichia coli (ATCC). 8739) and Staphylococcus aureus (ATCC6538), the fabric is the antibacterial and deodorizing fabric I, antibacterial and deodorizing fabric II, antibacterial and deodorizing fabric III, antibacterial and deodorizing fabric IV, antibacterial and deodorizing fabric V, antibacterial and deodorizing fabric VI, antibacterial and deodorizing fabric VII, antibacterial and deodorizing fabric VIII, antibacterial and deodorizing fabric IX and antibacterial and deodorizing fabric X prepared in this invention; the control sample is a cotton fabric (plain weave fabric, the warp and weft yarn fineness of the cotton fabric is 15tex, the warp density and weft density are 520 threads / 10cm and 280 threads / 10cm respectively, and the weight is 110g / m) without any antibacterial and deodorizing components. 2 );

[0098] The test results are shown in Table 1 below;

[0099] Table 1. Test results of antibacterial and deodorizing fabrics

[0100]

[0101] The experimental results in Table 1 show that:

[0102] Antibacterial and deodorizing fabrics I, II, III, IV, V, VI, VII, VIII, IX, and X all exhibit an inhibition rate of over 99% against Escherichia coli and Staphylococcus aureus when unwashed, demonstrating excellent antibacterial properties.

[0103] After 50 washes, the antibacterial and deodorizing fabrics I, III, V, VII, and IX showed a smaller decrease in their antibacterial rates against Escherichia coli and Staphylococcus aureus, demonstrating excellent long-lasting antibacterial properties. However, the antibacterial and deodorizing fabrics II, IV, VI, VIII, and X showed a larger decrease in their antibacterial rates against Escherichia coli and Staphylococcus aureus. This indicates that the silver-loaded silica gel prepared without 3,4-dihydroxybenzaldehyde had poor adhesion to cotton fabrics and chitosan, resulting in weak interfacial bonding between the silica gel and these materials. The loaded silver ions were easily lost with the coating peeling off, leading to a decrease in the antibacterial rate against Escherichia coli and Staphylococcus aureus after 50 washes.

[0104] II. Deodorization Effect Test: According to GB / T 33610.2-2017 "Determination of Deodorization Performance of Textiles - Part 2: Detection Tube Method", the reduction rate of odor component concentration of antibacterial and deodorizing fabrics (antibacterial and deodorizing fabric I, antibacterial and deodorizing fabric II, antibacterial and deodorizing fabric III, antibacterial and deodorizing fabric IV, antibacterial and deodorizing fabric V, antibacterial and deodorizing fabric VI, antibacterial and deodorizing fabric VII, antibacterial and deodorizing fabric VIII, antibacterial and deodorizing fabric IX and antibacterial and deodorizing fabric X) was tested. The odor component was ammonia. The dimensions of antibacterial and deodorizing fabrics I, II, III, IV, V, VI, VII, VIII, IX and X were 10cm × 10cm.

[0105] The test results are shown in Table 2 below;

[0106] Table 2. Test results of the deodorizing effect of antibacterial and deodorizing fabrics

[0107]

[0108] The experimental results in Table 2 show that:

[0109] The ammonia removal rates of Antibacterial and Odor-Eliminating Fabric I, Antibacterial and Odor-Eliminating Fabric II, Antibacterial and Odor-Eliminating Fabric III, Antibacterial and Odor-Eliminating Fabric IV, Antibacterial and Odor-Eliminating Fabric V, Antibacterial and Odor-Eliminating Fabric VI, Antibacterial and Odor-Eliminating Fabric VII, Antibacterial and Odor-Eliminating Fabric VIII, Antibacterial and Odor-Eliminating Fabric IX, and Antibacterial and Odor-Eliminating Fabric X are 84.93%, 80.06%, 86.75%, 82.80%, 87.19%, 83.47%, 88.54%, 84.72%, 90.28%, and 87.05% respectively, all of which meet the requirements for the deodorizing performance of textiles (it can be judged as qualified by the instrument method that the ammonia removal rate for judging the deodorizing effect of textiles needs to reach more than 80%).

Claims

1. A method for preparing an antibacterial and deodorizing fabric, characterized in that, Includes the following steps: Step 1: Synthesize thiol-functionalized vanillin. The chemical structural formula of this thiol-functionalized vanillin is as follows: ； Step 2: Preparation of silver-loaded silica gel: Silver ions are loaded by the Schiff base reaction between the amino groups in the amino-modified silica gel and the aldehyde groups in the mercapto-functionalized vanillin, and by the strong coordination between the mercapto groups and silver ions and the porous structure of the silica gel. Step 3: Place the silica gel in deionized water to prepare an antibacterial dispersion; immerse cotton fabric in the antibacterial dispersion and chitosan solution in sequence to prepare an antibacterial and deodorizing fabric.

2. The method for preparing an antibacterial and deodorizing fabric according to claim 1, characterized in that, The silver-loaded silica gel is a catechol-type silver-loaded silica gel, which is prepared by: reacting the amino groups in the aminated silica gel with the aldehyde groups in the mercapto-functionalized vanillin and 3,4-dihydroxybenzaldehyde through a Schiff base reaction, and loading silver ions through the strong coordination between the mercapto groups and silver ions and the porous structure of the silica gel, thus preparing the catechol-type silver-loaded silica gel.

3. The method for preparing an antibacterial and deodorizing fabric according to claim 1, characterized in that, The method for preparing the thiol-functionalized vanillin is as follows: Under the action of an acid-binding agent, alkenylated vanillin is prepared by reacting the hydroxyl group in 1 molar equivalent of vanillin with the acyl chloride group in 1 molar equivalent of acryloyl chloride. Based on the thiol-alkene click reaction mechanism, 1 molar equivalent of alkenyl vanillin reacts with 1 molar equivalent of octamercaptoPOSS under photoinitiator and ultraviolet light irradiation to prepare thiol-functionalized vanillin.

4. The method for preparing an antibacterial and deodorizing fabric according to claim 3, characterized in that, The acid-binding agent is one of triethylamine and pyridine.

5. The method for preparing an antibacterial and deodorizing fabric according to claim 3, characterized in that, The photoinitiator is one of benzoin dimethyl ether, benzoin isopropyl ether, and benzoin ethyl ether.

6. The method for preparing an antibacterial and deodorizing fabric according to claim 1, characterized in that, The chitosan solution is prepared by adding chitosan to an acetic acid solution and mechanically stirring for 25-35 minutes to obtain the chitosan solution.

7. An antibacterial and deodorizing fabric prepared by the method according to any one of claims 1-6, characterized in that, The fabric has an antibacterial rate of over 99% and an ammonia removal rate of over 80% when unwashed.

8. The antibacterial and deodorizing fabric according to claim 7, characterized in that, The average diameter of the silicone is 5 μm.

9. The antibacterial and deodorizing fabric according to claim 7, characterized in that, The solid content of the antibacterial dispersion is 20-40%.

10. The antibacterial and deodorizing fabric according to claim 7, characterized in that, The chitosan solution has a mass fraction of 1-3%.

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