Antibacterial and antiviral composition, finishing agent, fabric, and preparation method of the composition

Abstract

The present invention discloses an antibacterial and antiviral composition, a finishing agent, a fabric, and a preparation method of the composition. The antibacterial and antiviral composition is obtained by reacting modified natural nano-minerals with natural plant extracts. The modified natural nano-minerals are first treated by pre-supporting a quaternary ammonium salt / ethanol solution and then modified by a betaine sulfonamide / ethanol solution. The natural plant extracts are obtained by extracting natural plants through a complex enzyme. The antibacterial and antiviral finishing agent comprises the following components by weight: 20-50 parts of the antibacterial and antiviral composition, 0.1-1 parts of a dispersant, 0.1-1 parts of a wetting agent, 0.1-0.5 parts of a thickener, and 40-80 parts of water. The antibacterial and antiviral fabric is obtained by padding and finishing the fabric with a cationic polymer, an antibacterial and antiviral finishing agent, and a cationic polymer in sequence. The present invention arranges the modified plant extract onto the fabric through a layer-by-layer assembly technology. The natural antibacterial and antiviral ingredients are released long-lastingly and slowly on the fabric, and are resistant to multiple washings, creating a durable, efficient, and safe home environment.

Description

Technical Field

[0001] The present invention relates to an antibacterial and antiviral agent and a preparation method thereof, and in particular to an antibacterial and antiviral composition, a finishing agent, a fabric and a preparation method of the composition. Background Art

[0002] An increasing number of products are being equipped with antibacterial and antiviral properties to protect people's health and safety. Since bacteria and viruses can enter indoor spaces through dust, air, and droplets, and the porous structure of textiles easily serves as a breeding ground for microorganisms, imparting antibacterial and antiviral properties to fabrics has become a research hotspot in recent years. Traditional organic and inorganic antibacterial materials have their own advantages and disadvantages, and performance evaluation of antiviral materials is still scarce, limiting the range of options available. With increasing awareness of health and safety, in addition to the material's inherent performance, its safety and environmental performance are also receiving significant attention.

[0003] Extracts from the flowers, leaves, stems, roots, wood, bark, seeds, or fruits of natural plants contain a variety of active ingredients, including terpenes, polyphenols, flavonoids, fatty acids, and alkaloids, with significant antiviral, antibacterial, and antimicrobial effects. CN111411510 discloses an antibacterial, anti-mite, and antiviral finishing agent containing a plant extract. However, the presence of inorganic metal components reduces the safety of the material itself. CN114150501 discloses an antibacterial and antiviral finishing agent, its preparation method, and its use. By mixing a traditional Chinese medicine extract with other components and applying it directly to fabric, the durability of the finishing agent is significantly reduced. Summary of the Invention

[0004] Purpose of the invention: The present invention aims to provide a green, safe, long-lasting and efficient antibacterial and antiviral composition containing natural plants, and the present invention also provides a preparation method of the antibacterial and antiviral composition. In addition, the present invention also provides an antibacterial and antiviral finishing agent and antibacterial and antiviral fabric made from the antibacterial and antiviral composition.

[0005] Technical solution: The antibacterial and antiviral composition of the present invention is obtained by reacting modified natural nano-minerals with natural plant extracts. The modified natural nano-minerals are prepared by pre-treating the natural nano-minerals with a quaternary ammonium salt / ethanol solution (i.e., a mixed solution of a quaternary ammonium salt and ethanol) and then modifying them with an ammonium sulfobetaine / ethanol solution (i.e., a mixed solution of sulfobetaine and ethanol). The natural plant extracts are obtained by extracting natural plants with a complex enzyme.

[0006] Furthermore, the natural plants are at least three of Radix Isatidis, Baical Scutellariae, Houttuynia Cordata, Taraxacum Herba, Sarcandra, Gardenia, Coptis Rhizome, Phellodendron Amurense, Honeysuckle, Forsythia suspensa, Lonicera japonica, Patchouli, Menthol, Licorice, Perilla Leaf, Folium Isatidis and Stephania japonica.

[0007] Furthermore, the natural nano mineral is one of montmorillonite, halloysite, medical stone, attapulgite or sepiolite.

[0008] The preparation method of the above-mentioned antibacterial and antiviral composition comprises the following steps:

[0009] (1) After the fresh natural plant is cleaned, crushed and dried, it is added to a buffer solution, and then a complex enzyme is added to perform enzymolysis. After the enzymolysis is completed, the complex enzyme is inactivated by heating to obtain an enzymatic solution; then, an ethanol aqueous solution is added to the enzymatic solution, and the solution is subjected to a water bath and sequential extraction under different pH conditions. After the extraction is completed, the solution is filtered, neutralized, concentrated, spray-dried and sieved to obtain a powdered natural plant extract;

[0010] (2) adding the natural nano-mineral into a quaternary ammonium salt / ethanol solution, subjecting the mixture to reflux reaction, filtering, washing, and drying to obtain a pre-supported product;

[0011] (3) adding the pre-supported material to an ammonium sulfobetaine / ethanol solution, reflux reaction, filtering, washing, and drying to obtain a modified material;

[0012] (4) adding the modified substance to an aqueous solution of a natural plant extract, mixing and reacting, filtering, washing, and drying to obtain an antibacterial and antiviral composition.

[0013] Furthermore, in step (1), the buffer solution is an acetic acid-sodium acetate buffer solution with a pH of 4-5, and the volume ratio of the mass of the natural plant to the buffer solution is 1 g:10-20 ml; the complex enzyme is composed of cellulase and pectinase, the mass ratio of cellulase and pectinase is 1:1, the mass of the complex enzyme is 0.5-1% of the mass of the natural plant, and the enzymatic hydrolysis conditions are: temperature 40-50°C, time 2-4h; the ethanol aqueous solution is a 50% ethanol aqueous solution, and the ethanol aqueous solution supplements the volume of the enzymatic hydrolysis solution to 30-50 times the mass of the natural plant; the extraction temperature is 35-55°C, the extraction pH is 5-6, 6.5-7.5 and 8-9 respectively, and the extraction time is 1-2h.

[0014] Furthermore, in step (2), the mass ratio of the natural nano-mineral to the quaternary ammonium salt / ethanol solution is 1:20-40, the mass percentage of the quaternary ammonium salt to the ethanol in the quaternary ammonium salt / ethanol solution is 30-60%, the quaternary ammonium salt is a linear alkyl trimethyl ammonium chloride, the carbon chain length of the linear alkyl is 8-12, and the conditions for the reflux reaction are: temperature 80-120°C, time 2-4h; in step (3), the mass ratio of the pre-support to the ammonium sulfonate betaine / ethanol solution is 1:20-40, the ammonium sulfonate betaine / ethanol solution is 30-60%, the quaternary ammonium salt is a linear alkyl trimethyl ammonium chloride, the carbon chain length of the linear alkyl is 8-12, and the conditions for the reflux reaction are: temperature 80-120°C, time 2-4h; The mass percentage of betaine to ethanol is 30-60%, the ammonium sulfonate betaine is one of ammonium sulfonate betaine-1, ammonium sulfonate betaine-2, ammonium sulfonate betaine-3 and ammonium sulfonate betaine-4, and the reflux reaction conditions are: temperature 80-120° C., and time 2-4 hours; in step (4), the mass ratio of the modified substance to the aqueous solution of the natural plant extract is 1:10-20, the mass percentage of the natural plant extract to water is 10-30%, and the mixing reaction conditions are: temperature 30-50° C., and time 20-24 hours.

[0015] The antibacterial and antiviral finishing agent of the present invention comprises the following components by weight: 20-50 parts of the above antibacterial and antiviral composition, 0.1-1 part of a dispersant, 0.1-1 part of a wetting agent, 0.1-0.5 part of a thickener and 40-80 parts of water.

[0016] Furthermore, the dispersant is one of polyester hyperdispersant, polyether hyperdispersant or polyolefin hyperdispersant; the wetting agent is one of fatty alcohol polyoxyethylene ether, polyoxyethylene sorbitan fatty acid ester or polycarboxylate; and the thickener is one of xanthan gum, carrageenan or guar gum.

[0017] Furthermore, the preparation method of the antibacterial and antiviral finishing agent is as follows: the antibacterial and antiviral composition, a dispersant, a wetting agent, a thickener and water are mixed, stirred and dispersed for 2-4 hours to obtain the finished agent.

[0018] The antibacterial and antiviral fabric of the present invention is obtained by padding and finishing the cationic polymer, the antibacterial and antiviral finishing agent, and the cationic polymer in sequence.

[0019] Furthermore, the fabric is a natural fiber, a regenerated cellulose fiber or a blended fabric of natural fiber and regenerated cellulose fiber; the cationic polymer is one of polyhexamethylene biguanide hydrochloride, polyaminopropyl biguanide hydrochloride, polymalonic acid guanidine hydrochloride, polyquaternium-6, polyquaternium-33, polyquaternium-37 or cationic polyacrylamide.

[0020] Furthermore, the preparation method of the above-mentioned antibacterial and antiviral fabric is: 5-15g / L cationic polymer is impregnated and finished on the fabric and then dried at 150-180°C, 30-60g / L antibacterial and antiviral finishing agent is impregnated and finished on the fabric and then dried at 120-150°C, and 5-15g / L cationic polymer is impregnated and finished on the fabric and then dried at 120-150°C.

[0021] Principle of the Invention: Traditional solvent thermal extraction methods for extracting active ingredients from natural plants typically require high temperatures and long extraction times due to cellulose in the cell wall, requiring large amounts of solvent and resulting in low extraction yields for active ingredients such as flavonoids and alkaloids. Pre-extraction pretreatment with a complex enzyme modifies the permeability of the plant cell wall, easing extraction conditions while improving the extraction yield of the target ingredients. The natural plants used in this invention, such as alicyclic organic acids such as chlorogenic acid and quinic acid from honeysuckle, glycyrrhizic acid and glycyrrhetinic acid from licorice, flavonoids such as forsythiaside and astragalin from forsythia, and isoflurane from sarcandra; and alkaloids such as galactopyrin and epigalactopyrin from isatis root, have all been shown to be effective antibacterial and antiviral active ingredients. These active ingredients exhibit varying extraction rates under different conditions. To fully and effectively extract these active ingredients in one go, the present invention first employs a suitable complex enzyme to degrade the plant cell surface structure and break down the cell barrier. Low-temperature extraction with ethanol at varying pH levels is then performed, preserving the antibacterial and antiviral properties of the active ingredients while simultaneously improving extraction yield and reducing energy consumption.

[0022] The natural nano-minerals in the present invention are a type of silicate with a layered structure. The surface of this type of silicate exhibits a negative surface potential within a wide pH range, and the layers have cation exchange capacity. The interlayer density of the natural nano-mineral is reduced by pre-supporting with straight-chain alkyl trimethyl ammonium chloride, and then ammonium sulfonate betaine is used to replace the straight-chain alkyl trimethyl ammonium chloride and enter the interlayer. The sulfonic acid groups in the molecular structure of ammonium sulfonate betaine react with active groups such as hydroxyl and carboxyl groups in natural plant extracts, thereby increasing the adsorption capacity of active molecules. More importantly, the NC=O group in the molecular structure can increase the adsorption capacity of plant active molecules. After modification, ammonium sulfonate betaine can effectively enhance the interaction between natural nano-minerals and natural plant extracts, thereby increasing the loading capacity and adsorption capacity of plant active molecules.

[0023] The surface of natural and regenerated cellulose fabrics has abundant hydroxyl groups and is electronegative. In order to apply the natural antibacterial and antiviral composition, which also has a negative charge, to the fabric, the present invention first applies a cationic polymer to the fabric to make it electropositive, then adsorbs the natural antibacterial and antiviral composition to the fabric through electrostatic force, and finally applies the cationic polymer again to the fabric. By assembling the fabric layer by layer, the antibacterial and antiviral composition is firmly attached to the fabric. At the same time, the wrapping of the cationic polymer further slows down the release of the plant extract from the natural nano-minerals, thereby improving the antibacterial and antiviral washability of the fabric after treatment.

[0024] Beneficial effects: Compared with the prior art, the present invention has the following significant advantages:

[0025] (1) The present invention utilizes the biological activity of the complex enzyme to sequentially perform low-temperature extraction of plant active ingredients in weak acid, neutral, and weak base systems. The extraction process is green, environmentally friendly, and energy-efficient. The extracted active ingredients are rich in variety and high in content without destroying the molecular structure of the active ingredients, thereby retaining the antibacterial and antiviral effects of the plant extracts to the greatest extent.

[0026] (2) The present invention uses modified natural nano-minerals to modify plant extracts, and the plant extracts can be efficiently and firmly loaded in the natural nano-minerals, ensuring that they are not easily deteriorated or lost during processing and use;

[0027] (3) The present invention adopts the layer-by-layer main coating technology to arrange the modified plant extract ingredients on the fabric. The natural antibacterial and antiviral ingredients are released on the fabric in a long-lasting and slow manner, and are resistant to multiple washings, creating a durable, efficient and safe home environment. DETAILED DESCRIPTION

[0028] The technical solution of the present invention will be further described below in conjunction with embodiments.

[0029] Example 1: The antibacterial and antiviral composition of the present invention is prepared by the following method:

[0030] (1) After removing impurities and crushing and drying, 5 g of Scutellaria baicalensis, Houttuynia cordata, Coral recutita, Honeysuckle and Forsythia suspensa was taken and added to 100 mL of acetic acid-sodium acetate buffer with a pH of 4, and then 0.025 g of cellulase and 0.025 g of pectinase were added. The mixture was enzymatically hydrolyzed at 40°C for 4 h. After the enzymatic hydrolysis, the mixture was heated to 80°C to inactivate the complex enzyme. The volume of the enzymatic hydrolysis solution was supplemented to 150 mL with 50% ethanol aqueous solution, and the pH was adjusted with sodium hydroxide. The system was extracted at pH 6, 7.5 and 9 in a water bath at 55°C for 1 h respectively. After the extraction was completed, the mixture was filtered, neutralized, concentrated, spray-dried and sieved to obtain a powdered natural plant extract component.

[0031] (2) 10 g of sepiolite and 400 g of 30% (w / w) dodecyltrimethylammonium chloride / ethanol solution were refluxed at 120° C. for 2 h, filtered, washed, and dried to obtain a pre-supported product;

[0032] (3) 10 g of the pre-supported product and 400 g of ammonium sulfobetaine-1 / ethanol solution [30% (W / W)] were refluxed at 120°C for 2 h, filtered, washed, and dried to obtain a modified product;

[0033] (4) 5 g of the modified product and 100 g of a 10% (W / W) aqueous solution of a natural plant extract were reacted at 50° C. for 20 h, and then filtered, washed, and dried to obtain an antibacterial and antiviral composition.

[0034] The antibacterial and antiviral finishing agent of the present invention is prepared by the following method:

[0035] Take 50g of the antibacterial and antiviral composition, 1g of a polyester hyperdispersant, 1g of a fatty alcohol polyoxyethylene ether, 0.5g of xanthan gum and 80g of water, mix and stir and disperse for 4h to obtain an antibacterial and antiviral finishing agent.

[0036] The antibacterial and antiviral fabric of the present invention is prepared by the following method:

[0037] The cotton fabric was padded and finished with 15 g / L polyaminopropyl biguanide hydrochloride and dried at 180°C; the above fabric was padded and finished with 60 g / L antibacterial and antiviral finishing agent and dried at 150°C; the above fabric was padded and finished with 15 g / L polyaminopropyl biguanide hydrochloride and dried at 150°C to obtain the antibacterial and antiviral cotton fabric.

[0038] Example 2: The antibacterial and antiviral composition of the present invention is prepared by the following method:

[0039] (1) After removing impurities and crushing, drying, taking 5 g of honeysuckle, forsythia, liquorice and Stephania japonica, adding 5 g to 50 mL of acetic acid-sodium acetate buffer with a pH of 5, adding 0.0125 g of cellulase and 0.0125 g of pectinase, and enzymolysis at 50 ° C for 2 h. After the enzymolysis is completed, heating to 100 ° C to inactivate the complex enzyme; the volume of the enzymolysis solution is supplemented to 250 mL with 50% ethanol aqueous solution, and the pH is adjusted with sodium hydroxide, and the system is extracted at pH 5.5, 7 and 8.5 in a water bath at 35 ° C for 2 h; after the extraction is completed, filtering, neutralizing, concentrating, spray drying and sieving to obtain powdered natural plant extract components;

[0040] (2) 10 g of attapulgite and 200 g of a 60% (W / W) decanyltrimethylammonium chloride / ethanol solution were refluxed at 80° C. for 4 h, filtered, washed, and dried to obtain a pre-supported product;

[0041] (3) 10 g of the pre-supported product and 200 g of ammonium sulfobetaine-2 / ethanol solution [60% (W / W)] were refluxed at 80°C for 4 h, filtered, washed, and dried to obtain the modified product;

[0042] (4) 5 g of the modified product and 50 g of a 30% (W / W) aqueous solution of a natural plant extract were reacted at 40° C. for 22 h, and then filtered, washed, and dried to obtain an antibacterial and antiviral composition.

[0043] The antibacterial and antiviral finishing agent of the present invention is prepared by the following method: taking 20g of the antibacterial and antiviral composition, 0.1g of a polyether-type hyperdispersant, 0.1g of polyoxyethylene sorbitan fatty acid ester, 0.1g of carrageenan and 40g of water, mixing and stirring and dispersing for 2h to obtain the antibacterial and antiviral finishing agent.

[0044] The antibacterial and antiviral fabric of the present invention is prepared by the following method: padding and finishing a Tencel fabric with 5 g / L of polyquaternium-6, and drying at 150° C.; padding and finishing the fabric with 30 g / L of an antibacterial and antiviral finishing agent, and drying at 120° C.; padding and finishing the fabric with 5 g / L of polyquaternium-6, and drying at 120° C. to obtain the antibacterial and antiviral Tencel fabric.

[0045] Example 3: The antibacterial and antiviral composition of the present invention is prepared by the following method:

[0046] (1) Radix Isatidis, Herba Taraxaci, Herba Gardeniae, Folium Isatidis, Rhizoma Coptidis and Mentha were ground and dried, 5 g of which was added to 75 mL of acetic acid-sodium acetate buffer with a pH of 4.5, and then 0.02 g of cellulase and 0.02 g of pectinase were added. The mixture was enzymolyzed at 45°C for 3 h. After the enzymolysis was completed, the mixture was heated to 90°C to inactivate the complex enzyme. The volume of the enzymolysis solution was supplemented to 200 mL with 50% ethanol aqueous solution, and the pH was adjusted with sodium hydroxide. The system was extracted at pH 5, 6.5 and 8 in a water bath at 45°C for 1.5 h. After the extraction was completed, the mixture was filtered, neutralized, concentrated, spray-dried and sieved to obtain a powdered natural plant extract.

[0047] (2) 10 g of halloysite and 300 g of 40% (W / W) n-octyltrimethylammonium chloride / ethanol solution were refluxed at 100° C. for 3 h, filtered, washed, and dried to obtain a pre-supported product;

[0048] (3) 10 g of the pre-supported product and 300 g of ammonium sulfobetaine-4 / ethanol solution [40% (W / W)] were refluxed at 100°C for 3 h, filtered, washed, and dried to obtain the modified product;

[0049] (4) 5 g of the modified product and 70 g of a 20% (W / W) aqueous solution of a natural plant extract were reacted at 30° C. for 24 h, and then filtered, washed, and dried to obtain an antibacterial and antiviral composition.

[0050] The antibacterial and antiviral finishing agent of the present invention is prepared by the following method: 35g of the antibacterial and antiviral composition, 0.5g of a polyolefin hyperdispersant, 0.5g of a polycarboxylate, 0.25g of guar gum and 60g of water are mixed, stirred and dispersed for 3h to obtain the antibacterial and antiviral finishing agent.

[0051] The antibacterial and antiviral fabric of the present invention is prepared by the following method: padding and finishing Tencel cotton fabric with 10 g / L cationic polyacrylamide, and drying at 160° C.; padding and finishing the above fabric with 45 g / L antibacterial and antiviral finishing agent, and drying at 130° C.; padding and finishing the above fabric with 10 g / L cationic polyacrylamide, and drying at 130° C. to obtain the antibacterial and antiviral Tencel cotton fabric.

[0052] Comparative Example 1

[0053] Compared with Example 1, no composite enzyme hydrolysis was performed before extraction, and the extraction temperature was increased to 85°C.

[0054] Comparative Example 2

[0055] Compared with Example 1, the pH value was maintained at 6 during the extraction of natural plant ingredients.

[0056] Comparative Example 3

[0057] Compared with Example 1, the natural plant extract was not modified by the modified sepiolite and was directly applied to the fabric.

[0058] Comparative Example 4

[0059] Compared with Example 1, the sepiolite was not pre-supported by the dodecyltrimethylammonium chloride / ethanol solution.

[0060] Comparative Example 5

[0061] Compared with Example 1, the presupport is modified by using dodecyl dimethyl betaine.

[0062] Comparative Example 6

[0063] Compared with Example 1, the presupport is modified by using dodecyl sulfobetaine.

[0064] Comparative Example 7

[0065] Compared with Example 1, the antibacterial and antiviral finishing agent is directly applied to the pure cotton fabric.

[0066] Comparative Example 8

[0067] Compared with Example 1, the antibacterial and antiviral finishing was not followed by further cationic polymer finishing.

[0068] The test method for antibacterial properties of fabrics refers to GB / T 20944.2-2013 "Evaluation of Antimicrobial Properties of Textiles - Part 2: Absorption Method"; the test method for antiviral properties of fabrics refers to ISO 18184-2019 "Determination of Antiviral Activity of Textiles".

[0069] Table 1 Test results of antibacterial and antiviral properties of fabrics before washing and after 20 washes

[0070]

[0071] It can be seen from Table 1 that the fabrics obtained in Examples 1 to 3 have good antibacterial and antiviral properties before and after washing. In Comparative Example 1, the natural plant ingredients were not hydrolyzed by a composite enzyme before extraction. Although the extraction temperature was increased, a large number of active ingredients were hindered by the cellulose in the plant cell wall. The content of the extracted natural plant ingredients was low and the types were small. In addition, the high-temperature energy consumption would affect the molecular structure of the active substances, resulting in the general antibacterial and antiviral properties of the fabric after finishing. In Comparative Example 2, the pH was kept fixed during the extraction of the natural plant ingredients. Although the permeability of the plant cells was changed by enzymatic hydrolysis, the active substances had different leaching rates at different pH values, resulting in the content and types of the extracted natural plant ingredients being insufficient. The antibacterial and antiviral properties of the fabric after finishing were general. In Comparative Example 3, the natural plant extract ingredients were directly applied to the fabric. Because the natural plant extract ingredients would be continuously lost during multiple washing processes, although the antibacterial and antiviral effects were very good before washing, the performance decreased significantly after washing. In Comparative Example 4, the sepiolite was not pre-supported with dodecyltrimethylammonium chloride. Due to the high interlayer charge density, ammonium sulfobetaine-1 was unable to penetrate the sepiolite interlayers, resulting in minimal natural plant extract content on the finished fabric. Pre-wash antibacterial and antiviral performance were moderate, and wash durability was poor. In Comparative Example 5, the pre-support was modified with dodecyldimethylbetaine. Only the carboxyl groups in dodecyldimethylbetaine reacted with the active groups in the natural plant extracts, and the adsorption capacity of the carboxyl groups was not as high as that of the sulfonic acid groups. Therefore, the amount of natural plant extracts that penetrated the sepiolite interlayers was low, and the absence of NC=O groups led to poor adsorption. The antibacterial and antiviral properties of the finished fabric were moderate before washing, but significantly decreased after washing. In Comparative Example 6, the pre-support was modified with dodecylsulfobetaine. Dodecylsulfobetaine contained sulfonic acid groups but no NC=O groups. Although the natural plant extract content between the sepiolite interlayers was sufficient, adsorption was poor. Although the antibacterial and antiviral effects of the finished fabric before washing are good, the performance after washing is not ideal. Comparative Example 6 has better overall effects than Comparative Example 5, which also shows that the adsorption capacity of sulfonic acid groups is higher than that of carboxyl groups. Comparative Example 7 directly applies the antibacterial and antiviral finishing agent to the pure cotton fabric. Due to the electrostatic repulsion between the antibacterial and antiviral composition and the fabric, it is not resistant to washing, and the antibacterial and antiviral effects of the fabric before and after washing are not ideal. In Comparative Example 8, the antibacterial and antiviral composition finished on the fabric is not further wrapped with a cationic polymer, which cannot further prevent the loss of plant extracts from natural nano-minerals during the washing process. Although the antibacterial and antiviral effects of the fabric before washing are good, the performance decreases after washing.

Claims

1. An antibacterial and antiviral composition, characterized in that: The invention is obtained by reacting modified natural nano-minerals with natural plant extracts. The modified natural nano-minerals are prepared by pre-supporting the natural nano-minerals with a quaternary ammonium salt / ethanol solution and then modifying them with an ammonium sulfobetaine / ethanol solution. The natural plant extracts are obtained by extracting natural plants with a composite enzyme. The composite enzyme consists of cellulase and pectinase, the mass ratio of cellulase to pectinase is 1:1, the mass of the composite enzyme is 0.5-1% of the mass of the natural plant, and the enzymatic hydrolysis conditions are: temperature 40-50°C, time 2-4h; extraction pH values ​​are 5-6, 6.5-7.5 and 8-9, respectively, the extraction temperature is 35-55°C, and the extraction time is 1-2h. The quaternary ammonium salt is linear alkyl trimethyl ammonium chloride, the carbon chain length of the linear alkyl group is 8-12, and the ammonium sulfobetaine is one of ammonium sulfobetaine-1, ammonium sulfobetaine-2, ammonium sulfobetaine-3 and ammonium sulfobetaine-4.

2. The antibacterial and antiviral composition according to claim 1, characterized in that The natural plants are at least three of Radix Isatidis, Baical Skullcap, Houttuynia Cordata, Taraxacum Officinale, Sarcandra Glabra, Gardenia Jasminoides, Coptis Chinensis, Phellodendron Amurense, Honeysuckle, Forsythia suspensa, Lonicera japonica, Patchouli, Mint, Licorice, Perilla Leaf, Folium Isatidis and Stephania japonica.

3. The antibacterial and antiviral composition according to claim 1, characterized in that The natural nano mineral is one of montmorillonite, halloysite, medical stone, attapulgite or sepiolite.

4. A method for preparing the antibacterial and antiviral composition according to claim 1, characterized in that: The following steps are involved: (1) After the fresh natural plant is cleaned, crushed and dried, it is added to a buffer solution, and then a complex enzyme is added to perform enzymolysis. After the enzymolysis is completed, the complex enzyme is inactivated by heating to obtain an enzymatic solution; then, an ethanol aqueous solution is added to the enzymatic solution, and the solution is subjected to a water bath and sequential extraction under different pH conditions. After the extraction is completed, the solution is filtered, neutralized, concentrated, spray-dried and sieved to obtain a powdered natural plant extract; (2) Adding natural nano-minerals to a quaternary ammonium salt / ethanol solution, reflux reaction, filtering, washing, and drying to obtain a pre-supported material; (3) Add the pre-supported material to ammonium sulfobetaine / ethanol solution, reflux reaction, filter, wash and dry to obtain the modified material; (4) The modified product is added to an aqueous solution of a natural plant extract, mixed and reacted, filtered, washed, and dried to obtain a natural antibacterial and antiviral composition.

5. An antibacterial and antiviral finishing agent, characterized in that: The composition comprises the following components in parts by weight: 20-50 parts of the antibacterial and antiviral composition according to any one of claims 1 to 3, 0.1-1 part of a dispersant, 0.1-1 part of a wetting agent, 0.1-0.5 part of a thickener and 40-80 parts of water.

6. The antibacterial and antiviral finishing agent according to claim 5, characterized in that: The dispersant is one of polyester hyperdispersant, polyether hyperdispersant or polyolefin hyperdispersant; the wetting agent is one of fatty alcohol polyoxyethylene ether, polyoxyethylene sorbitan fatty acid ester or polycarboxylate; and the thickener is one of xanthan gum, carrageenan or guar gum. 7.An antibacterial and antiviral fabric, characterized in that: The fabric is subjected to padding finishing in sequence with a cationic polymer, the antibacterial and antiviral finishing agent according to any one of claims 5 to 6, and a cationic polymer to obtain an antibacterial and antiviral fabric.

8. The antibacterial and antiviral fabric according to claim 7, characterized in that: The fabric is a natural fiber, a regenerated cellulose fiber or a blend of natural fiber and regenerated cellulose fiber; the cationic polymer is one of polyhexamethylene biguanide hydrochloride, polyaminopropyl biguanide hydrochloride, polymalonic acid guanidine hydrochloride, polyquaternium-6, polyquaternium-33, polyquaternium-37 or cationic polyacrylamide.

Images