Intrinsic antibacterial non-woven fabric and preparation method thereof

Abstract

The invention relates to the technical field of antibacterial non-woven fabrics, and discloses an intrinsic antibacterial non-woven fabric and a preparation method thereof.The intrinsic antibacterial non-woven fabric is prepared by adopting a dip-coating method and by soaking a non-woven fabric in antibacterial slurry, taking out the non-woven fabric for drip drying and then drying the non-woven fabric to constant weight; wherein the antibacterial slurry is prepared by compounding antibacterial polyol with a synergistic antibacterial effect, nano titanium dioxide modified by a coupling functional phenolic hydroxyl Schiff base type antibacterial monomer and a branched antibacterial monomer. According to the intrinsic antibacterial non-woven fabric, the technical problems that in the prior art, an antibacterial agent is large in toxicity, prone to loss and insufficient in antibacterial spectrum coverage range are solved, and the intrinsic antibacterial non-woven fabric can also be applied to the field of filtering materials, the field of medical treatment and public health and the field of textile materials and has the beneficial technical effects of inhibiting bacterial growth and guaranteeing sanitation and safety.

Description

Technical Field

[0001] The invention relates to the technical field of antibacterial nonwoven fabrics, in particular to an intrinsic antibacterial nonwoven fabric and a preparation method thereof. Background Art

[0002] Nonwoven fabric is a kind of nonwoven fabric composed of directional or random fibers. Since its production process does not use weaving technology, there is no warp and weft. Nonwoven fabric is widely used in filtering water, air, etc. due to its excellent filtering performance. However, nonwoven fabric is easily contaminated by bacteria during use, which affects its use effect and hygienic safety. Therefore, how to improve the antibacterial properties of nonwoven fabric has become an important research topic.

[0003] Antibacterial materials refer to materials that can inhibit the growth of bacteria, fungi or other microorganisms, and are widely used in the fields of medical treatment, food, and home appliances. The existing technology mainly achieves the antibacterial effect of non-woven fabrics by coating antibacterial agents on non-woven fabrics. Commonly used antibacterial agents include silver ions, copper ions, quaternary ammonium salts, etc. These antibacterial agents can effectively inhibit the growth of bacteria, but there are also some problems. First, most of the existing antibacterial agents are toxic and may have adverse effects on the human body and the environment; secondly, the existing antibacterial agents are easily lost during use, thereby affecting the durability of their antibacterial effects; finally, the existing antibacterial agents have limitations in the antibacterial spectrum and may not work on certain types of bacteria. Therefore, how to develop an environmentally friendly, efficient, and broad-spectrum antibacterial non-woven fabric has become an important challenge facing current technology. Summary of the invention

[0004] The present invention adopts a dipping process to immerse the non-woven fabric in an independently developed antibacterial slurry to prepare an intrinsically antibacterial non-woven fabric, which solves the technical problems in the prior art that the antibacterial agent is highly toxic, easy to lose, and has insufficient antibacterial spectrum coverage. It can also be used in the fields of filtration materials, medical and health care, and textile materials, and has the beneficial technical effect of inhibiting bacterial growth and ensuring sanitary safety.

[0005] An intrinsic antibacterial non-woven fabric, which is prepared by a dip coating method, wherein a non-woven fabric having a thickness of 0.2-0.5 mm is immersed in an antibacterial slurry for 1-5 minutes, taken out and dripped dry, and dried to a constant weight;

[0006] The formula of the antibacterial slurry is: 5-15 parts by weight of dodecanol, 5-15 parts by weight of hexadecanol, 5-15 parts by weight of octadecyl alcohol, 0.5-1.5 parts by weight of stearic acid, 0.5-1.5 parts by weight of potassium sorbate, 15-45 parts by weight of hydrophilic nano titanium dioxide powder, 10-30 parts by weight of coupled functionalized phenolic hydroxyl Schiff base antibacterial monomer, 5-20 parts by weight of branched antibacterial monomer and 5-15 parts by weight of deionized water;

[0007] The coupled functionalized phenolic hydroxyl Schiff base antibacterial monomer is a coupled functionalized monophenolic hydroxyl Schiff base antibacterial monomer or a coupled functionalized polyphenolic hydroxyl Schiff base antibacterial monomer.

[0008] Preferably, the preparation method of the coupled functionalized monophenolic hydroxyl Schiff base antibacterial monomer is: using the Schiff base reaction mechanism, through the -NH 2 The functional group undergoes a condensation reaction with the aldehyde functional group of vanillin to prepare a coupled functionalized monophenolic hydroxyl Schiff base type antibacterial monomer.

[0009] Preferably, the preparation method of the coupled functionalized polyphenol hydroxyl Schiff base type antibacterial monomer is: utilizing the nucleophilic substitution reaction mechanism, under the promotion of an activator, an organic base is used to catalyze the acylation reaction between the carboxyl functional group of gallic acid and the -NH- functional group of the coupled functionalized monophenol hydroxyl Schiff base type antibacterial monomer, so as to prepare the coupled functionalized polyphenol hydroxyl Schiff base type antibacterial monomer.

[0010] Preferably, the activator is one of N,N'-dicyclohexylcarbodiimide (DCC), 1-hydroxybenzotriazole (HOBT), N-hydroxy-7-azabenzotriazole (HOAT), and 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (EDC);

[0011] Preferably, the organic base is one of pyridine, triethylamine, tributylamine and imidazole.

[0012] Preferably, the preparation method of the branched antibacterial monomer is: using the Schiff base reaction mechanism, through the -NH 2 The functional group undergoes a condensation reaction with the aldehyde functional group of vanillin to prepare a branched antibacterial monomer.

[0013] A method for preparing an intrinsic antibacterial nonwoven fabric comprises the following steps:

[0014] Step 1: according to the formula of the antibacterial slurry, dodecanol, hexadecanol, stearic acid, potassium sorbate and deionized water are mixed evenly, and the oil bath is heated to 110-130° C. and stirred for reaction to prepare an antibacterial polyol;

[0015] Step 2: Based on the coupling reaction of silanol functional groups and hydroxyl functional groups, the hydrophilic nano-titanium dioxide powder is surface-modified by using a coupling functionalized phenolic hydroxyl Schiff base antibacterial monomer to prepare surface-modified nano-titanium dioxide;

[0016] Step 3: Based on the hydrogen bonding effect, the antibacterial polyol, the surface-modified nano-titanium dioxide and the branched antibacterial monomer are mixed to prepare an antibacterial slurry;

[0017] Step 4: Immerse the non-woven fabric in the antibacterial slurry, take it out and drip it dry, and then dry it to prepare the intrinsic antibacterial non-woven fabric.

[0018] Compared with the existing technology, the beneficial effects of this technical solution are as follows:

[0019] The present invention prepares an antibacterial slurry through the synergistic antibacterial effect of antibacterial polyol, nano titanium dioxide modified by coupling functionalized phenolic hydroxyl Schiff base antibacterial monomer and branched antibacterial monomer, and adopts a dip coating process to immerse the non-woven fabric in the antibacterial slurry, thereby preparing an intrinsic antibacterial non-woven fabric that does not contain toxic metal ions and has excellent antibacterial performance, the heavy metal content of which is less than 50ppm, and has broad-spectrum antibacterial properties, especially the killing rate of Escherichia coli and Staphylococcus aureus is ≥99%. DETAILED DESCRIPTION

[0020] Embodiment 1:

[0021] An intrinsic antibacterial non-woven fabric, wherein the intrinsic antibacterial non-woven fabric is prepared by a dip coating method, wherein a non-woven fabric having a thickness of 0.40 mm is immersed in an antibacterial slurry for 2 minutes, taken out and dripped dry, and then dried at a constant temperature of 40° C. to a constant weight;

[0022] Among them, the non-woven fabric was purchased from Dongguan Deli Non-woven Technology Co., Ltd., and its model is LEADER 130G;

[0023] The formula of the antibacterial slurry is: 10 parts by weight of dodecanol, 10 parts by weight of hexadecanol, 10 parts by weight of octadecyl alcohol, 1 part by weight of stearic acid, 1 part by weight of potassium sorbate, 28 parts by weight of hydrophilic nano titanium dioxide powder, 20 parts by weight of coupled functionalized phenolic hydroxyl Schiff base antibacterial monomer, 10 parts by weight of branched antibacterial monomer and 10 parts by weight of deionized water;

[0024] Among them, hydrophilic nano titanium dioxide powder was purchased from Ningbo Jiwei Nano New Material Technology Co., Ltd., and its average particle size was 20 nm;

[0025] The coupled functionalized phenolic hydroxyl Schiff base antibacterial monomer is a coupled functionalized monophenolic hydroxyl Schiff base antibacterial monomer or a coupled functionalized polyphenolic hydroxyl Schiff base antibacterial monomer;

[0026] The chemical structure and preparation method of the coupled functionalized monophenolic hydroxyl Schiff base antibacterial monomer are recorded in Experimental Example 1; the chemical structure and preparation method of the coupled functionalized polyphenolic hydroxyl Schiff base antibacterial monomer are recorded in Experimental Example 2; the chemical structure and preparation method of the branched antibacterial monomer are recorded in Experimental Example 3.

[0027] Embodiment 2:

[0028] The method for preparing an intrinsic antibacterial nonwoven fabric in Example 2 comprises the following preparation steps:

[0029] Step 1, preparing antibacterial polyol: adding dodecanol, hexadecanol, octadecyl alcohol, stearic acid, potassium sorbate and deionized water into a three-necked flask, heating to 120° C. in an oil bath, stirring for reaction for 3 h, and cooling to room temperature to obtain antibacterial polyol;

[0030] Step 2, preparing surface-modified nano-titanium dioxide: based on the coupling reaction of silanol functional groups and hydroxyl functional groups, the surface of the hydrophilic nano-titanium dioxide powder is modified by using a coupled functionalized phenolic hydroxyl Schiff base antibacterial monomer. The specific steps are: adding the hydrophilic nano-titanium dioxide powder and a mixed solvent (anhydrous ethanol / deionized water, V / V, 7:3, the amount of the solvent is 10 times the total weight of the hydrophilic nano-titanium dioxide powder) into a three-necked flask, ultrasonically mixing for 30 minutes, stirring at room temperature for 2 hours (stirring speed: 600 rpm), then adding the coupled functionalized phenolic hydroxyl Schiff base antibacterial monomer and 2 drops of glacial acetic acid to the flask in sequence, heating to 60°C, using a high-speed stirrer to stir the reaction at 800 rpm for 2 hours, filtering, repeatedly washing with anhydrous ethanol, and vacuum drying at 80°C for 4 hours to obtain surface-modified nano-titanium dioxide;

[0031] Step 3, preparing antibacterial slurry: according to the formula of the antibacterial slurry, based on the hydrogen bonding effect, the antibacterial polyol, the surface-modified nano-titanium dioxide and the branched antibacterial monomer are mixed, and the specific steps are: the antibacterial polyol prepared in step 1, the surface-modified nano-titanium dioxide prepared in step 2 and the branched antibacterial monomer are added into a three-necked flask, the temperature is raised to 60° C., the reaction is stirred for 12 hours, and the antibacterial slurry is obtained after being cooled to room temperature;

[0032] Step 4, soaking the non-woven fabric in the antibacterial slurry for 2 minutes, taking it out and dripping it dry, and drying it at a constant temperature of 40° C. to a constant weight, to obtain an intrinsic antibacterial non-woven fabric;

[0033] When the coupled functionalized phenolic hydroxyl Schiff base antibacterial monomer is a coupled functionalized monophenolic hydroxyl Schiff base antibacterial monomer, the prepared antibacterial slurry is recorded as antibacterial slurry Ⅰ, and the product prepared from the antibacterial slurry Ⅰ is recorded as intrinsic antibacterial non-woven fabric Ⅰ;

[0034] When the coupled functionalized phenolic hydroxyl Schiff base type antibacterial monomer is a coupled functionalized polyphenolic hydroxyl Schiff base type antibacterial monomer, the prepared antibacterial slurry is recorded as antibacterial slurry II, and the product prepared from antibacterial slurry II is recorded as intrinsic antibacterial non-woven fabric II.

[0035] Embodiment three:

[0036] An antibacterial slurry III is prepared, and the difference between the preparation method and the antibacterial slurry I is that the formula of the antibacterial slurry is: 5 parts by weight of dodecanol, 5 parts by weight of hexadecanol, 5 parts by weight of octadecyl alcohol, 1 part by weight of stearic acid, 1 part by weight of potassium sorbate, 23 parts by weight of hydrophilic nano titanium dioxide powder, 30 parts by weight of coupled functionalized monophenolic hydroxy Schiff base antibacterial monomer, 20 parts by weight of branched antibacterial monomer and 10 parts by weight of deionized water;

[0037] The intrinsic antibacterial non-woven fabric III is prepared by the same preparation method as that of the intrinsic antibacterial non-woven fabric I.

[0038] Embodiment 4:

[0039] An antibacterial slurry IV is prepared, and the difference between the preparation method and the antibacterial slurry I is that the formula of the antibacterial slurry is: 15 parts by weight of dodecanol, 15 parts by weight of hexadecanol, 15 parts by weight of octadecyl alcohol, 1 part by weight of stearic acid, 1 part by weight of potassium sorbate, 28 parts by weight of hydrophilic nano titanium dioxide powder, 10 parts by weight of coupled functionalized monophenolic hydroxyl Schiff base antibacterial monomer, 5 parts by weight of branched antibacterial monomer and 10 parts by weight of deionized water;

[0040] The intrinsic antibacterial nonwoven fabric IV is prepared by the same preparation method as that of the intrinsic antibacterial nonwoven fabric I.

[0041] Comparative Example:

[0042] A conventional antibacterial slurry is prepared, and the difference between the preparation method thereof and the antibacterial slurry I is that the conventional antibacterial slurry does not contain 20 parts by weight of coupled functionalized phenolic hydroxyl Schiff base antibacterial monomer and 10 parts by weight of branched antibacterial monomer;

[0043] The conventional antibacterial nonwoven fabric is prepared, and the difference between the preparation method of the conventional antibacterial nonwoven fabric and the preparation method of the intrinsic antibacterial nonwoven fabric I is that the surface of the hydrophilic nano-titanium dioxide powder is not modified by using a coupled functionalized phenolic hydroxyl Schiff base antibacterial monomer.

[0044] Performance Testing:

[0045] The performance test of the antibacterial slurry was carried out, and the results are shown in Table 1;

[0046] Table 1 Performance test results of antibacterial slurry

[0047]

[0048]

[0049] In addition, referring to AATCC 100-2012 "Evaluation Methods for Antimicrobial Textiles", the antimicrobial performance of the intrinsic antimicrobial non-woven fabric was evaluated. The specific test steps were as follows: a sample with a diameter of 6 mm was placed in a well plate, and 0.1 mL of a 2×10 8 CFU / mL of bacterial solution (phosphate buffered saline as buffer) was placed in an MJ-250I mold incubator for 30 min, then 0.9 mL of phosphate buffered saline was dripped into the well plate to which the bacterial solution had been added before, and after shaking, 0.1 mL of phosphate buffered saline was taken from the well plate and dripped into a centrifuge tube (volume 1.5 mL) containing 0.9 mL of phosphate buffered saline, and then 1×10 6 times, take 10 μL from each dilution gradient solution and drop it on the culture medium plate, culture for 24 hours, record the number of bacterial colonies and calculate the antibacterial rate of the sample. The specific method is as follows:

[0050] Bacterial inhibition rate (%) = (average colony count of the original bacterial solution - average colony count of the sample treated with antibacterial treatment and the original bacterial solution at the corresponding gradient) / average colony count of the original bacterial solution × 100%;

[0051] The tensile properties of the intrinsic antibacterial nonwoven fabric were tested using a CTM2050 microcomputer-controlled electronic universal testing machine. The sample size was 150 mm × 25 mm (length × width) and the tensile rate was 5 mm / min.

[0052] Table 2 Performance test results of intrinsic antibacterial nonwoven fabrics

[0053]

[0054] The bacterial liquid was ATCC6538 Staphylococcus aureus and ATCC25922 Escherichia coli purchased from Shanghai Luwei Technology Co., Ltd.

[0055] According to the performance test results, the following conclusions were obtained:

[0056] Conclusion 1: The intrinsic antibacterial non-woven fabric products prepared by the present invention have achieved significant improvement in antibacterial performance (inhibition of Escherichia coli and Staphylococcus aureus), and the heavy metal content is <50ppm, which is in line with the environmental protection trend;

[0057] Conclusion 2: The hydrophilic nano-titanium dioxide powder was surface modified by coupling functionalized polyphenol hydroxyl Schiff base antibacterial monomer to prepare the intrinsic antibacterial non-woven fabric II with the best antibacterial performance.

[0058] Experimental Example 1:

[0059] Preparation of coupled functionalized monophenolic hydroxyl Schiff base antibacterial monomers: Using the Schiff base reaction mechanism, the -NH 2 The functional group undergoes a condensation reaction with the aldehyde functional group of vanillin to generate a coupled functionalized monophenolic hydroxyl Schiff base antibacterial monomer, the chemical structure of which is:

[0060]

[0061] The specific experimental steps for preparing the coupled functionalized monophenolic hydroxyl Schiff base antibacterial monomer are as follows: 3.0 g of vanillin and 50 mL of anhydrous ethanol are added to a three-necked flask, stirred at room temperature until completely dissolved, then 4.3 mL of N-aminoethyl-3-aminopropylmethyldimethoxysilane is slowly added dropwise to the three-necked flask, stirred and mixed at room temperature for 10 min, and then 2 drops of glacial acetic acid are added dropwise, the temperature is raised to 85° C. and refluxed for 3 h, cooled to room temperature, washed with anhydrous ethanol, rotary evaporated, and vacuum dried to obtain a coupled functionalized monophenolic hydroxyl Schiff base antibacterial monomer;

[0062] The nuclear magnetic resonance hydrogen spectrum of the coupled functionalized monophenolic hydroxyl Schiff base antibacterial monomer is characterized as follows: 1 HNMR (DMSO-d 6 , 400MHz) δ: 0.11 (s, 3H), 0.84-0.88 (t, 2H), 1.47-1.54 (m, 2H), 2.60-2.65 (m, 2H), 2.90-2.95 (m, 2H), 3.1 0-3.16 (m, 1H), 3.46 (s, 6H), 3.65-3.69 (t, 2H), 3.87 (s, 3H), 6.98-7.34 (m, 3H), 8.37 (s, 1H), 8.75 (s, 1H).

[0063] Experimental Example 2:

[0064] Preparation of coupled functionalized polyphenol hydroxy Schiff base antibacterial monomer: Using the nucleophilic substitution reaction mechanism, under the promotion of the activator, the carboxyl functional group of gallic acid and the -NH- functional group of the coupled functionalized monophenol hydroxy Schiff base antibacterial monomer are catalyzed by an organic base to undergo an acylation reaction to generate a coupled functionalized polyphenol hydroxy Schiff base antibacterial monomer, the chemical structure of which is:

[0065]

[0066] Wherein, the activator is one of N,N'-dicyclohexylcarbodiimide (DCC), 1-hydroxybenzotriazole (HOBT), N-hydroxy-7-azabenzotriazole (HOAT), and 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (EDC);

[0067] In this experimental example, 1-hydroxybenzotriazole was selected;

[0068] The organic base is one of pyridine, triethylamine, tributylamine and imidazole;

[0069] In this experimental example, triethylamine was selected;

[0070] The specific experimental steps for preparing the coupled functionalized polyphenol hydroxyl Schiff base type antibacterial monomer are as follows: under the protection of nitrogen, 3.4 g of coupled functionalized monophenol hydroxyl Schiff base type antibacterial monomer, 1.7 g of gallic acid, 0.8 g of triethylamine, and 50 mL of anhydrous dichloromethane are added to a three-necked flask with a water separator, and stirred at room temperature for 30 minutes. Then, 10 mL of 1-hydroxybenzotriazole solution (prepared with 1.2 g of 1-hydroxybenzotriazole and 10 mL of anhydrous dichloromethane) is added to the three-necked flask, and the reaction is stirred at room temperature for 20 hours. The solution is washed with dichloromethane, rotary evaporated, and vacuum dried to obtain a coupled functionalized polyphenol hydroxyl Schiff base type antibacterial monomer.

[0071] The nuclear magnetic resonance hydrogen spectrum of the coupled functionalized polyphenol hydroxyl Schiff base antibacterial monomer is characterized as follows: 1 HNMR (DMSO-d 6 , 400MHz) δ: 0.10 (s, 3H), 0.90-0.94 (t, 2H), 1.64-1.71 (m, 2H), 3.25-3.28 (t, 2H), 3.46 (s, 6H), 3.7 7-3.85(m, 4H), 3.94(s, 3H), 6.83-7.30(m, 5H), 8.25(s, 1H), 8.38(s, 1H), 8.76(s, 1H), 8.86(s, 2H).

[0072] Experimental Example 3:

[0073] Preparation of branched antibacterial monomers: Using the Schiff base reaction mechanism, the -NH 2 The functional group undergoes a condensation reaction with the aldehyde functional group of vanillin to generate a branched antibacterial monomer, the chemical structure of which is:

[0074]

[0075] The specific experimental steps for preparing the branched antibacterial monomer are as follows: 1.2 g of melamine and 20 mL of anhydrous methanol are added to a three-necked flask, stirred at room temperature until completely dissolved, then 30 mL of vanillin solution (prepared from 4.6 g of vanillin and 30 mL of anhydrous methanol) is slowly added dropwise to the three-necked flask, stirred and mixed at room temperature for 10 min, and then 2 drops of glacial acetic acid are added dropwise, the temperature is raised to 70° C. and refluxed for 5 h, cooled to room temperature, washed with anhydrous methanol, rotary evaporated, and vacuum dried to obtain a branched antibacterial monomer;

[0076] The nuclear magnetic resonance hydrogen spectrum of the branched antibacterial monomer is characterized as follows: 1 H NMR (DMSO-d 6 , 400MHz) δ: 3.87 (s, 9H), 6.95-7.37 (m, 9H), 8.81 (s, 3H), 9.19 (s, 3H).

Claims

1. An intrinsic antibacterial nonwoven fabric, characterized in that: The intrinsic antibacterial non-woven fabric is prepared by a dip coating method, wherein a non-woven fabric having a thickness of 0.2-0.5 mm is immersed in an antibacterial slurry for 1-5 minutes, taken out and dripped dry, and dried to a constant weight; The formula of the antibacterial slurry is: 5-15 parts by weight of dodecanol, 5-15 parts by weight of hexadecanol, 5-15 parts by weight of octadecyl alcohol, 0.5-1.5 parts by weight of stearic acid, 0.5-1.5 parts by weight of potassium sorbate, 15-45 parts by weight of hydrophilic nano titanium dioxide powder, 10-30 parts by weight of coupled functionalized phenolic hydroxyl Schiff base antibacterial monomer, 5-20 parts by weight of branched antibacterial monomer and 5-15 parts by weight of deionized water; The coupled functionalized phenolic hydroxyl Schiff base antibacterial monomer is a coupled functionalized monophenolic hydroxyl Schiff base antibacterial monomer or a coupled functionalized polyphenolic hydroxyl Schiff base antibacterial monomer.

2. The intrinsic antibacterial nonwoven fabric according to claim 1, characterized in that: The chemical structural formula of the coupled functionalized monophenolic hydroxyl Schiff base antibacterial monomer is:

3. The intrinsic antibacterial nonwoven fabric according to claim 2, characterized in that: The preparation method of the coupled functionalized monophenolic hydroxyl Schiff base type antibacterial monomer comprises: utilizing the Schiff base reaction mechanism, and preparing the coupled functionalized monophenolic hydroxyl Schiff base type antibacterial monomer through a condensation reaction between the -NH2 functional group of N-aminoethyl-3-aminopropylmethyldimethoxysilane and the aldehyde functional group of vanillin.

4. The intrinsic antibacterial nonwoven fabric according to claim 1, characterized in that: The chemical structural formula of the coupled functionalized polyphenol hydroxyl Schiff base antibacterial monomer is:

5. The intrinsic antibacterial nonwoven fabric according to claim 4, characterized in that: The preparation method of the coupled functionalized polyphenol hydroxyl Schiff base type antibacterial monomer comprises: utilizing a nucleophilic substitution reaction mechanism, under the promotion of an activator, catalyzing an acylation reaction between the carboxyl functional group of gallic acid and the -NH- functional group of the coupled functionalized monophenol hydroxyl Schiff base type antibacterial monomer by an organic base, and preparing the coupled functionalized polyphenol hydroxyl Schiff base type antibacterial monomer.

6. The intrinsic antibacterial nonwoven fabric according to claim 5, characterized in that: The activator is one of N,N'-dicyclohexylcarbodiimide, 1-hydroxybenzotriazole, N-hydroxy-7-azabenzotriazole, and 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride; The organic base is one of pyridine, triethylamine, tributylamine and imidazole.

7. The intrinsic antibacterial nonwoven fabric according to claim 1, characterized in that: The chemical structural formula of the branched antibacterial monomer is:

8. The intrinsic antibacterial nonwoven fabric according to claim 7, characterized in that: The preparation method of the branched antibacterial monomer comprises: utilizing the Schiff base reaction mechanism to prepare the branched antibacterial monomer through a condensation reaction between the -NH2 functional group of melamine and the aldehyde functional group of vanillin.

9. The method for preparing an intrinsic antibacterial nonwoven fabric according to any one of claims 1 to 8, characterized in that: The following steps are involved: Step 1: uniformly mix dodecanol, hexadecanol, octadecyl alcohol, stearic acid, potassium sorbate and deionized water, heat the oil bath to 110-130° C., stir and react to prepare an antibacterial polyol; Step 2: Based on the coupling reaction of silanol functional groups and hydroxyl functional groups, the hydrophilic nano-titanium dioxide powder is surface-modified by using a coupling functionalized phenolic hydroxyl Schiff base antibacterial monomer to prepare surface-modified nano-titanium dioxide; Step 3: According to the formula of the antibacterial slurry, based on the hydrogen bonding effect, the antibacterial polyol, the surface-modified nano-titanium dioxide and the branched antibacterial monomer are mixed to prepare the antibacterial slurry; Step 4: Immerse the non-woven fabric in the antibacterial slurry, take it out and drip it dry, and then dry it to constant weight to prepare an intrinsic antibacterial non-woven fabric.

10. An intrinsic antibacterial nonwoven fabric according to any one of claims 1 to 8, characterized in that: The application of intrinsic antibacterial non-woven fabrics in the filtration industry, medical and health fields, and textile materials fields plays a role in inhibiting bacterial growth and ensuring hygiene and safety.

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