A nonwoven material with excellent moisture absorption and air permeability and preparation method thereof

Abstract

The present application belongs to the technical field of nonwoven materials and specifically discloses a nonwoven material with excellent moisture absorption and breathability and a preparation method thereof. The nonwoven material with excellent moisture absorption and breathability comprises two layers of PP spunbond nonwoven material, an adhesive bonded between the two layers of PP spunbond nonwoven material, and an antibacterial layer coated on the side of the two layers of PP spunbond nonwoven material away from the adhesive; the raw material components of the antibacterial layer, in parts by weight, include the following raw materials: 10-30 parts of Sophora flavescens extract, 25-45 parts of chitosan, 5-10 parts of nano-titanium dioxide, 80-120 parts of anhydrous ethanol, 90-110 parts of malic acid, 12-18 parts of diatomaceous earth, and 3-5 parts of a film-forming aid. The nonwoven material prepared in this application has good strength, toughness, and high breathability, and also has excellent antibacterial and antibacterial durability.

Description

Technical Field

[0001] The present application relates to the technical field of nonwoven materials, and in particular to a nonwoven material with excellent moisture absorption and breathability and a preparation method thereof. Background Art

[0002] Nonwoven materials, also known as non-woven fabrics, non-woven fabrics or non-woven fabrics, are sheets, webs or mats made of directional or randomly arranged fibers combined with each other through friction, cohesion or bonding or a combination of the above methods. The fibers used can be natural fibers or chemical fibers, or fibrous materials formed by short fibers or filaments.

[0003] Nonwoven materials, due to their unique structure, versatile processing, and properties unmatched by other textiles, have been applied across various sectors of the national economy. Polypropylene nonwoven fabric, a type of nonwoven fabric made from PP through processes such as melt drawing, web laying, hot rolling, and bonding, offers advantages such as good breathability, low cost, and strong mechanical properties. It is used in clothing, home decoration, and medical applications. However, because polypropylene itself lacks antibacterial properties, it is easily infected by bacteria and fungi when used in sanitary materials such as masks and surgical gowns, leading to infection and disease transmission, thus limiting its application. Summary of the Invention

[0004] In order to improve the problem that polypropylene does not have antibacterial properties, the present application provides a non-woven material with excellent moisture absorption and breathability and a preparation method thereof.

[0005] The present application provides a nonwoven material with excellent moisture absorption and breathability, which adopts the following technical solutions:

[0006] A nonwoven material with excellent moisture absorption and breathability comprises two layers of PP spunbond nonwoven material, an adhesive being bonded between the two layers, and an antibacterial layer being coated on the sides of the two layers away from the adhesive. The antibacterial layer comprises the following raw materials, in parts by weight: 10-30 parts of Sophora flavescens extract, 25-45 parts of chitosan, 5-10 parts of nano-titanium dioxide, 80-120 parts of anhydrous ethanol, 90-110 parts of malic acid, 12-18 parts of diatomaceous earth, and 3-5 parts of a film-forming aid.

[0007] By adopting the above technical solution, the PP spunbond nonwoven material has excellent mechanical properties, high tensile strength, elongation at break and tear strength, and high air permeability. The two layers of PP spunbond nonwoven material are connected by an adhesive, which further enhances the mechanical properties of the nonwoven material. One side of the two layers of PP spunbond nonwoven material is coated with an antibacterial layer. The antibacterial layer gives the nonwoven material antibacterial properties. When it is used in sanitary materials such as masks and surgical gowns, the chance of infection by bacteria and fungi is reduced, thereby reducing the chance of infection and disease transmission, further expanding the application of polypropylene materials.

[0008] The main chemical components of Sophora flavescens extract are alkaloids and flavonoids. The extract has antibacterial effects and has a strong antibacterial effect on Staphylococcus aureus. Chitosan has strong antibacterial, bactericidal and deodorizing effects, which can quickly eliminate bacteria or pathogens and reduce the chance of infection. Sophora flavescens extract and chitosan are combined to improve the antibacterial properties of the antibacterial layer, and chitosan can promote the Sophora flavescens extract to exert its maximum antibacterial effect, further enhancing the antibacterial durability of the Sophora flavescens extract. The Sophora flavescens extract and chitosan work together to have a synergistic effect and jointly improve the antibacterial durability of the antibacterial layer.

[0009] Nano-titanium dioxide has excellent antibacterial and self-cleaning functions, and has the characteristics of strong antibacterial ability, broad antibacterial spectrum, long antibacterial effect, non-toxicity and safety. Diatomaceous earth has good antibacterial and antifungal properties, and has extremely strong antibacterial and bactericidal effects on Escherichia coli. Diatomaceous earth itself is a porous inorganic mineral that can adsorb nano-titanium dioxide, increase the specific surface area of ​​diatomaceous earth, reduce the probability of agglomeration of nano-titanium dioxide, and further enhance the antibacterial properties of non-woven materials. Chitosan further coats the diatomaceous earth loaded with nano-titanium dioxide, which helps to enhance the antibacterial properties and helps to further improve the bonding performance of the antibacterial layer with the PP spunbond non-woven material layer, thereby improving the washability of the PP spunbond non-woven material layer and increasing the antibacterial durability.

[0010] Preferably, the method for preparing the Sophora flavescens extract comprises the following steps:

[0011] (1) Slice and crush the root of Sophora flavescens, add anhydrous ethanol and soak for 12-14 hours, then add ethanol to a mass concentration of 60-80%, heat and extract at 50-60°C for 3-8 hours, and filter to obtain a filtrate;

[0012] (2) adding bamboo vinegar and betaine to the filtrate obtained in step (1), stirring at 30-45° C. for 2-4 hours to obtain a Sophora flavescens extract.

[0013] By adopting the above technical solution, the Sophora flavescens roots are first crushed to facilitate the subsequent extraction of the extract, and then soaked in anhydrous ethanol to activate the active substances in the Sophora flavescens roots, which is conducive to the subsequent heating extraction of the extract. Bamboo vinegar itself has a bactericidal and antibacterial effect. The addition of bamboo vinegar can promote the activity of the Sophora flavescens filtrate, increase the effective extraction rate of the Sophora flavescens extract, and thus improve the antibacterial property of the Sophora flavescens extract. The mixture of bamboo vinegar and Sophora flavescens filtrate has a synergistic effect and can improve the antibacterial effect of the Sophora flavescens filtrate. Betaine has a bactericidal and anti-inflammatory effect on the one hand, and can regulate the acid-base balance of the Sophora flavescens extract on the other hand, thereby improving the antibacterial property of the Sophora flavescens extract. In addition, betaine has a strong oxidizing effect, which can improve the stability of the Sophora flavescens extract, avoid oxidation of the Sophora flavescens extract, and help maintain the durability of the antibacterial property of the Sophora flavescens extract.

[0014] Preferably, the mass ratio of the Sophora flavescens root, bamboo vinegar and betaine is 1:10-18:0.5-0.9.

[0015] By adopting the above technical solution, the mass ratio of the sophora flavescens root, bamboo vinegar and betaine is controlled within a certain range, which helps to improve the antibacterial properties and antibacterial durability of the sophora flavescens extract. The sophora flavescens root, bamboo vinegar and betaine work together to have a synergistic effect and jointly improve the antibacterial effect of the sophora flavescens extract. At the same time, betaine can regulate the acid-base balance and strong oxidizing properties of the sophora flavescens extract, and can prolong the antibacterial durability of the sophora flavescens extract.

[0016] Preferably, the diatomaceous earth is pretreated by the following method:

[0017] (1) calcining diatomaceous earth at a temperature of 800-1000° C. for 2-3 hours, then adding sodium hydroxide and soaking for 1-2 hours to obtain pretreated diatomaceous earth;

[0018] (2) dispersing carbon nanotubes in ethanol, and then adding the carbon nanotubes to the diatomaceous earth obtained in step (1), ultrasonicating for 12-14 hours, and setting aside; (3) adding cellulose acetate to the diatomaceous earth treated in step (2), continuing stirring for 12-14 hours, and drying to obtain modified fly ash.

[0019] By adopting the above technical solution, diatomaceous earth is first calcined at a high temperature to remove organic impurities in the diatomaceous earth, thereby increasing the microporous permeability of the diatomaceous earth, thereby increasing the specific surface area of ​​the diatomaceous earth, enhancing the subsequent adsorption performance of the diatomaceous earth, and facilitating the subsequent combination with nano-titanium dioxide. Then, sodium hydroxide is added for soaking to further remove organic matter in the diatomaceous earth, increase the pore size ratio of the diatomaceous earth, improve the activity of the diatomaceous earth, and further improve the adsorption performance of the diatomaceous earth.

[0020] Carbon nanotubes have good mechanical properties, tensile strength and flexibility. Carbon nanotubes are loaded in the pores of diatomaceous earth, which increases the mechanical properties of diatomaceous earth. At the same time, the curled one-dimensional tubular molecules formed by carbon nanotubes help to load nano-titanium dioxide, thereby improving the mechanical properties, antibacterial properties and antibacterial durability of non-woven materials. At the same time, carbon nanotubes have good antibacterial properties, and together with nano-titanium dioxide and chitosan, they jointly improve the antibacterial properties of non-woven materials.

[0021] The addition of acetate fiber further improves the structural properties of diatomaceous earth. Acetate fiber, carbon nanotubes and diatomaceous earth are used together to form a three-dimensional network structure. Acetate fiber and carbon nanotubes are entangled with each other and loaded on the surface or voids of diatomaceous earth, thereby increasing the specific surface area of ​​diatomaceous earth, facilitating the subsequent loading of nano-titanium dioxide, further increasing the stability of the diatomaceous earth structure, and improving the antibacterial and antibacterial durability of diatomaceous earth. In addition, acetate fiber has good tensile properties and toughness, thereby improving the mechanical properties of diatomaceous earth, which helps to subsequently improve the mechanical properties of non-woven materials.

[0022] Preferably, the mass ratio of the diatomaceous earth, carbon nanotubes and acetate fiber is 1:0.3-0.6:0.1-0.3.

[0023] By adopting the above technical solution, the mass ratio of diatomaceous earth, carbon nanotubes and acetate fiber is controlled to obtain diatomaceous earth with better mechanical properties and antibacterial properties, which is conducive to the subsequent application of diatomaceous earth. The combination of diatomaceous earth, carbon nanotubes and acetate fiber has a synergistic effect, which jointly improves the antibacterial property and antibacterial durability of diatomaceous earth. Acetate fiber and carbon nanotubes are entangled with each other and jointly loaded on the surface or in the gaps of diatomaceous earth, which improves the porosity of diatomaceous earth and the adsorption of diatomaceous earth, which helps the subsequent combination of diatomaceous earth and other components to jointly improve the antibacterial property and antibacterial durability of non-woven materials.

[0024] Preferably, the adhesive is water-based polyurethane.

[0025] By adopting the above technical solution, water-based polyurethane uses water as solvent, is pollution-free, safe and reliable, has excellent mechanical properties and good compatibility, and is conducive to the bonding between PP spunbond non-woven material layers. At the same time, it has the characteristics of high temperature resistance, soft texture, high bonding strength, rapid curing after subsequent coating, transparency, extremely low odor, waterproof and high temperature resistance after complete curing.

[0026] Preferably, the two PP spunbond nonwoven material layers are both prepared by a conventional spunbond method.

[0027] By adopting the above technical scheme, the conventional spunbond method is used to prepare the PP spunbond non-woven material layer, which mainly includes using the chemical fiber spinning method to spin, draw, and stack the polypropylene raw materials into a net, and finally reinforced by acupuncture, hot rolling or self-bonding to form a non-woven material. The non-woven material has the advantages of high strength, small difference in longitudinal and transverse strength, acid and alkali resistance, non-toxicity, harmless to human physiology, and excellent air permeability.

[0028] Preferably, the film-forming aid is one or more of ethylene glycol, propylene glycol and hexylene glycol.

[0029] By adopting the above technical solution, the film-forming aid can promote the plastic flow and elastic deformation of each raw material component in the antibacterial layer, improve the cohesion performance, and be a substance that can form a film within a wider construction temperature range, which is helpful for the preparation of the antibacterial layer.

[0030] In a second aspect, the present application also provides a method for preparing a non-woven material with excellent moisture absorption and breathability, comprising the following steps: (1) first dissolving chitosan in malic acid, then adding Sophora flavescens extract, and stirring for 2-5 hours to obtain a mixture one; (2) uniformly mixing nano-titanium dioxide, anhydrous ethanol, diatomaceous earth and a film-forming aid to obtain a mixture two; (3) adding the mixture one obtained in step (1) to the mixture two obtained in step (2), and continuing stirring at a stirring temperature of 80-90°C for 2-5 hours to obtain a non-woven material with excellent moisture absorption and breathability.

[0031] By adopting the above technical solution and the above step-by-step preparation method, the raw materials can be mixed evenly, the operation is simple, the processing is easy, the antibacterial property and antibacterial durability of the non-woven material are improved, and subsequent industrial production is facilitated.

[0032] Preferably, in step (1), the stirring temperature is 50-60°C.

[0033] By adopting the above technical solution, the heating temperature in step (1) is controlled to be 50-60°C, which helps to uniformly mix the components. In step (2), the mixing temperature of the composition is further increased, thereby improving the dissolution efficiency of the composition and helping to uniformly mix.

[0034] In summary, this application has the following beneficial effects:

[0035] 1. The PP spunbond nonwoven material in this application has excellent mechanical properties, high tensile strength, elongation at break and tear strength, and high air permeability. The two layers of PP spunbond nonwoven material are connected by an adhesive, which further enhances the mechanical properties of the nonwoven material. One side of the two layers of PP spunbond nonwoven material is coated with an antibacterial layer. The antibacterial layer gives the nonwoven material antibacterial properties. When it is used in sanitary materials such as masks and surgical gowns, the chance of infection by bacteria and fungi is reduced, thereby reducing the chance of infection and disease transmission, further expanding the application of polypropylene materials.

[0036] 2. The main chemical components of the Sophora flavescens extract in this application are alkaloids and flavonoids, etc. The extract has antibacterial effects and has a strong antibacterial effect on Staphylococcus aureus. Chitosan has strong antibacterial, bactericidal and deodorizing effects, which can quickly eliminate bacteria or pathogens and reduce the chance of infection. The Sophora flavescens extract is combined with chitosan to improve the antibacterial properties of the antibacterial layer, and chitosan can promote the Sophora flavescens extract to exert its maximum antibacterial effect, further enhancing the antibacterial durability of the Sophora flavescens extract. The Sophora flavescens extract and chitosan cooperate with each other to have a synergistic effect and jointly improve the antibacterial durability of the antibacterial layer.

[0037] 3. The nano-titanium dioxide in this application has excellent antibacterial and self-cleaning functions, and has the characteristics of strong antibacterial ability, broad antibacterial spectrum, long antibacterial effect, non-toxicity and safety. Diatomaceous earth has good antibacterial and antifungal properties, and has extremely strong antibacterial and bactericidal effects on Escherichia coli. Diatomaceous earth itself is a porous inorganic mineral that can adsorb nano-titanium dioxide, increase the specific surface area of ​​diatomaceous earth, reduce the probability of agglomeration of nano-titanium dioxide, and further enhance the antibacterial properties of non-woven materials. Chitosan further coats the diatomaceous earth loaded with nano-titanium dioxide, which helps to enhance the antibacterial properties and helps to further improve the bonding performance of the antibacterial layer with the PP spunbond non-woven material layer, thereby improving the washability of the PP spunbond non-woven material layer and increasing the antibacterial durability. DETAILED DESCRIPTION

[0038] The present application is further described in detail below with reference to the embodiments.

[0039] The raw materials used in the examples and comparative examples can all be obtained commercially, wherein the adhesive is water-based polyurethane, the two layers of PP spunbond nonwoven material are both prepared by a conventional spunbond method, and the film-forming aid is ethylene glycol.

[0040] Preparation Example of Sophora flavescens Extract

[0041] Preparation Example 1-1

[0042] The preparation method of Sophora flavescens extract comprises the following steps:

[0043] (1) 1 kg of Sophora flavescens root was sliced ​​and crushed, added to 2 L of anhydrous ethanol and soaked for 13 h, then added to 5 L of 60-80% ethanol, heated and extracted at 55°C for 6 h, and filtered to obtain a filtrate;

[0044] (2) Bamboo vinegar and betaine are then added to the filtrate obtained in step (1), and the mixture is stirred at 35° C. for 3 h to obtain a Sophora flavescens extract, wherein the mass ratio of Sophora flavescens root, bamboo vinegar and betaine is 1:14:0.7.

[0045] Preparation Example 1-2

[0046] The difference from Preparation Example 1-1 is that in step (1), no anhydrous ethanol is used for soaking.

[0047] Preparation Examples 1-3

[0048] The difference from Preparation Example 1-1 is that, in step (2), bamboo vinegar is not added.

[0049] Preparation Examples 1-4

[0050] The difference from Preparation Example 1-1 is that in step (2), betaine is not added.

[0051] Preparation Examples 1-5

[0052] The difference from Preparation Example 1-1 is that the mass ratio of Sophora flavescens root, bamboo vinegar and betaine is 1:10:0.5.

[0053] Preparation Examples 1-6

[0054] The difference from Preparation Example 1-1 is that the mass ratio of Sophora flavescens root, bamboo vinegar and betaine is 1:18:0.9.

[0055] Preparation Examples 1-7

[0056] The difference from Preparation Example 1-1 is that the mass ratio of Sophora flavescens root, bamboo vinegar and betaine is 1:20:0.2.

[0057] Preparation Examples 1-8

[0058] The difference from Preparation Example 1-1 is that the mass ratio of Sophora flavescens root, bamboo vinegar and betaine is 1:8:1.2.

[0059] Pretreatment methods of diatomaceous earth

[0060] Preparation Example 2-1

[0061] Diatomaceous earth is pretreated by the following methods:

[0062] (1) 1.2 kg of diatomaceous earth was calcined at 900° C. for 3 h, and then 2.5 L of sodium hydroxide was added and soaked for 2 h to obtain pretreated diatomaceous earth;

[0063] (2) dispersing the carbon nanotubes in 1.5 L of ethanol, then adding the carbon nanotubes to the diatomaceous earth obtained in step (1), ultrasonicating for 13 h, and setting aside;

[0064] (3) Adding the diatomaceous earth treated in step (2) to cellulose acetate, stirring was continued for 14 hours, and drying was performed to obtain modified fly ash, wherein the mass ratio of diatomaceous earth, carbon nanotubes and cellulose acetate was 1:0.45:0.2.

[0065] Preparation Example 2-2

[0066] The difference from Preparation Example 2-1 is that in step (1), no calcination is performed.

[0067] Preparation Example 2-3

[0068] The difference from Preparation Example 2-1 is that in step (2), no carbon nanotubes are added.

[0069] Preparation Example 2-4

[0070] The difference from Preparation Example 2-1 is that in step (3), no acetate fiber is added.

[0071] Preparation Example 2-5

[0072] The difference from Preparation Example 2-1 is that the mass ratio of diatomaceous earth, carbon nanotubes and acetate fiber is 1:0.3:0.1.

[0073] Preparation Example 2-6

[0074] The difference from Preparation Example 2-1 is that the mass ratio of diatomaceous earth, carbon nanotubes and acetate fiber is 1:0.6:0.3.

[0075] Preparation Example 2-7

[0076] The difference from Preparation Example 2-1 is that the mass ratio of diatomaceous earth, carbon nanotubes and acetate fiber is 1:0.9:0.5.

[0077] Preparation Example 2-8

[0078] The difference from Preparation Example 2-1 is that the mass ratio of diatomaceous earth, carbon nanotubes and acetate fiber is 1:0.1:0.05.

[0079] Example

[0080] Example 1

[0081] A non-woven material with excellent moisture absorption and breathability comprises two layers of PP spunbond non-woven material, an adhesive is bonded between the two layers of PP spunbond non-woven material, and an antibacterial layer is coated on the sides of the two PP spunbond non-woven material layers away from the adhesive; the raw material components of the antibacterial layer include the following raw materials, by weight: 20 kg of Sophora flavescens extract, 30 kg of chitosan, 8 kg of nano-titanium dioxide, 100 kg of anhydrous ethanol, 100 kg of malic acid, 16 kg of diatomaceous earth, and 4 kg of a film-forming aid.

[0082] The preparation method of the above-mentioned non-woven material comprises the following steps: (1) first dissolving chitosan in malic acid, then adding Sophora flavescens extract, and stirring for 4 hours to obtain a mixture one; (2) uniformly mixing nano titanium dioxide, anhydrous ethanol, diatomaceous earth and a film-forming aid to obtain a mixture two; (3) adding the mixture one obtained in step (1) to the mixture two obtained in step (2), and continuing stirring at a stirring temperature of 85° C. for 3 hours to obtain a non-woven material with excellent moisture absorption and breathability; in step (1), the stirring temperature is 55° C.

[0083] The Sophora flavescens extract was prepared according to Preparation Example 1-1; and the diatomaceous earth was prepared according to Preparation Example 2-1.

[0084] Example 2

[0085] A nonwoven material with excellent moisture absorption and air permeability is disclosed, which differs from Example 1 in that the Sophora flavescens extract is prepared using Preparation Example 1-2.

[0086] Example 3

[0087] A nonwoven material with excellent moisture absorption and air permeability is disclosed, which differs from Example 1 in that the Sophora flavescens extract is prepared using Preparation Examples 1-3.

[0088] Example 4

[0089] A nonwoven material with excellent moisture absorption and air permeability is disclosed, which differs from Example 1 in that the Sophora flavescens extract is prepared using Preparation Examples 1-4.

[0090] Example 5

[0091] A nonwoven material with excellent moisture absorption and air permeability is disclosed, which differs from Example 1 in that the Sophora flavescens extract is prepared using Preparation Examples 1-5.

[0092] Example 6

[0093] A nonwoven material with excellent moisture absorption and air permeability is disclosed, which differs from Example 1 in that the Sophora flavescens extract is prepared using Preparation Examples 1-6.

[0094] Example 7

[0095] A nonwoven material with excellent moisture absorption and air permeability is disclosed, which differs from Example 1 in that the Sophora flavescens extract is prepared using Preparation Examples 1-7.

[0096] Example 8

[0097] A nonwoven material with excellent moisture absorption and air permeability is disclosed, which differs from Example 1 in that the Sophora flavescens extract is prepared using Preparation Examples 1-8.

[0098] Example 9

[0099] A nonwoven material with excellent moisture absorption and air permeability, which differs from Example 1 in that the diatomaceous earth is prepared using Preparation Example 2-2.

[0100] Example 10

[0101] A nonwoven material with excellent moisture absorption and air permeability, which differs from Example 1 in that the diatomaceous earth is prepared using Preparation Example 2-3.

[0102] Example 11

[0103] A nonwoven material with excellent moisture absorption and air permeability is disclosed, which differs from Example 1 in that the diatomaceous earth is prepared using Preparation Examples 2-4.

[0104] Example 12

[0105] A nonwoven material with excellent moisture absorption and air permeability is disclosed, which differs from Example 1 in that the diatomaceous earth is prepared using Preparation Examples 2-5.

[0106] Example 13

[0107] A nonwoven material with excellent moisture absorption and air permeability is disclosed, which differs from Example 1 in that the diatomaceous earth is prepared using Preparation Examples 2-6.

[0108] Example 14

[0109] A nonwoven material with excellent moisture absorption and air permeability is disclosed, which differs from Example 1 in that the diatomaceous earth is prepared using Preparation Examples 2-7.

[0110] Example 15

[0111] A nonwoven material with excellent moisture absorption and air permeability is disclosed, which differs from Example 1 in that the diatomaceous earth is prepared using Preparation Examples 2-8.

[0112] Example 16

[0113] A nonwoven material with excellent moisture absorption and breathability, which differs from Example 1 in that it comprises two layers of PP spunbond nonwoven material, an adhesive is bonded between the two layers of PP spunbond nonwoven material, and both layers of PP spunbond nonwoven material are coated with an antibacterial layer on a side away from the adhesive; the raw material components of the antibacterial layer include the following raw materials, by weight: 10 kg of Sophora flavescens extract, 25 kg of chitosan, 5 kg of nano-titanium dioxide, 80 kg of anhydrous ethanol, 90 kg of malic acid, 12 kg of diatomaceous earth, and 3 kg of a film-forming aid.

[0114] Example 17

[0115] A nonwoven material with excellent moisture absorption and breathability, which differs from Example 1 in that it comprises two layers of PP spunbond nonwoven material, an adhesive is bonded between the two layers of PP spunbond nonwoven material, and both layers of PP spunbond nonwoven material are coated with an antibacterial layer on a side away from the adhesive; the raw material components of the antibacterial layer include the following raw materials, by weight: 30 kg of Sophora flavescens extract, 45 kg of chitosan, 10 kg of nano-titanium dioxide, 120 kg of anhydrous ethanol, 110 kg of malic acid, 18 kg of diatomaceous earth, and 5 kg of a film-forming aid.

[0116] Comparative Example

[0117] Comparative Example 1

[0118] A nonwoven material with excellent moisture absorption and breathability, which differs from Example 1 in that it comprises two layers of PP spunbond nonwoven material, an adhesive is bonded between the two layers of PP spunbond nonwoven material, and both layers of PP spunbond nonwoven material are coated with an antibacterial layer on a side away from the adhesive; the raw material components of the antibacterial layer include the following raw materials, by weight: 40 kg of Sophora flavescens extract, 20 kg of chitosan, 3 kg of nano-titanium dioxide, 60 kg of anhydrous ethanol, 130 kg of malic acid, 8 kg of diatomaceous earth, and 1 kg of a film-forming aid.

[0119] Comparative Example 2

[0120] A nonwoven material with excellent moisture absorption and breathability, which differs from Example 1 in that it comprises two layers of PP spunbond nonwoven material, an adhesive is bonded between the two layers of PP spunbond nonwoven material, and both layers of PP spunbond nonwoven material are coated with an antibacterial layer on a side away from the adhesive; the raw material components of the antibacterial layer include the following raw materials, by weight: 5 kg of Sophora flavescens extract, 55 kg of chitosan, 15 kg of nano-titanium dioxide, 140 kg of anhydrous ethanol, 70 kg of malic acid, 28 kg of diatomaceous earth, and 8 kg of a film-forming aid.

[0121] Comparative Example 3

[0122] A nonwoven material with excellent moisture absorption and air permeability, which differs from Example 1 in that no Sophora flavescens extract is added.

[0123] Comparative Example 4

[0124] A nonwoven material with excellent moisture absorption and air permeability, which differs from Example 1 in that chitosan is not added.

[0125] Comparative Example 5

[0126] A nonwoven material with excellent moisture absorption and air permeability, which differs from Example 1 in that nano titanium dioxide is not added.

[0127] Comparative Example 6

[0128] A nonwoven material with excellent moisture absorption and air permeability, which is different from Example 1 in that the diatomaceous earth is purchased from Shijiazhuang Tianxu Environmental Protection Technology Co., Ltd.

[0129] Performance testing

[0130] The nonwoven materials prepared in Examples 1-17 and Comparative Examples 1-6 were tested for their antibacterial and mildew resistance properties according to the standard WST 650-2019 antibacterial and antibacterial effect evaluation method, with a test concentration of 1%. The results are shown in Table 1

[0131] Table 1 Test data of embodiments and comparative examples

[0132]

[0133]

[0134] As can be seen from Table 1, the non-woven materials prepared in Examples 1, 5-6, 12-13 and 16-17 of the present application have good mechanical properties, air permeability, antibacterial properties and antibacterial persistence. The initial antibacterial rate against Escherichia coli and Staphylococcus aureus reached 99.99%, and the initial antibacterial rate against Chaetomium globosum and Aspergillus flavus reached 99.99%. After washing 60 times, the initial antibacterial rate against Escherichia coli and Staphylococcus aureus reached 98.25%, and the initial antibacterial rate against Chaetomium globosum and Aspergillus flavus reached 98.36%, indicating that the prepared mixed non-woven material has excellent antibacterial properties and antibacterial persistence. When it is used in sanitary materials such as masks and surgical gowns, the chance of infection by bacteria and fungi is reduced, further expanding the application of polypropylene materials.

[0135] In the preparation method of Sophora flavescens extract, the roots of Sophora flavescens are not soaked in anhydrous ethanol, and the roots of Sophora flavescens are directly heated to extract the filtrate. As can be seen from Table 1, the initial inhibition rate against Escherichia coli and Staphylococcus aureus reaches 96.81%, and the initial inhibition rate against Chaetomium globosum and Aspergillus flavus reaches 96.84%. After washing with water 60 times, the initial inhibition rate against Escherichia coli and Staphylococcus aureus reaches 93.15%, and the initial inhibition rate against Chaetomium globosum and Aspergillus flavus reaches 93.21%. This shows that soaking the roots of Sophora flavescens in anhydrous ethanol first activates the active substances in the roots of Sophora flavescens, which is helpful for the subsequent heating extraction of the extract, thereby improving the antibacterial and antibacterial persistence of the Sophora flavescens extract.

[0136] Example 3: In the preparation method of the Sophora flavescens extract, no bamboo vinegar is added. As shown in Table 1, the initial antibacterial rates against Escherichia coli and Staphylococcus aureus reach 90.28%, and the initial antibacterial rates against Chaetomium globosum and Aspergillus flavus reach 90.15%. After washing with water 60 times, the initial antibacterial rates against Escherichia coli and Staphylococcus aureus reach 84.21%, and the initial antibacterial rates against Chaetomium globosum and Aspergillus flavus reach 84.24%. This indicates that bamboo vinegar can promote the activity of the Sophora flavescens filtrate, increase the effective extraction rate of the Sophora flavescens extract, and further improve the antibacterial properties and antibacterial durability of the Sophora flavescens extract.

[0137] In Example 4, betaine is not added in the preparation method of the Sophora flavescens extract. As can be seen from Table 1, the initial inhibition rate against Escherichia coli and Staphylococcus aureus reaches 88.92%, and the initial inhibition rate against Chaetomium globosum and Aspergillus flavus reaches 88.87%. After washing with water 60 times, the initial inhibition rate against Escherichia coli and Staphylococcus aureus reaches 82.21%, and the initial inhibition rate against Chaetomium globosum and Aspergillus flavus reaches 82.23%, indicating that betaine has bactericidal and anti-inflammatory effects, and betaine has a strong oxidizing effect, which can improve the stability of the Sophora flavescens extract, avoid the oxidation of the Sophora flavescens extract, and help maintain the durability of the antibacterial properties of the Sophora flavescens extract, thereby improving the antibacterial properties and antibacterial durability of the Sophora flavescens extract.

[0138] In Examples 7-8, the mass ratio of the root of Sophora flavescens, bamboo vinegar, and betaine was changed. As shown in Table 1, compared with Examples 1 and 3-6, the initial inhibition rates against Escherichia coli, Staphylococcus aureus, Chaetomium globosum, and Aspergillus flavus were higher than those in Examples 3-4, but lower than those in Examples 1 and 5-6. After washing with water 60 times, the initial inhibition rates against Escherichia coli, Staphylococcus aureus, Chaetomium globosum, and Aspergillus flavus were higher than those in Examples 3-4, but lower than those in Examples 1 and 5-6. This indicates that the combination of the root of Sophora flavescens, bamboo vinegar, and betaine has a synergistic effect, which jointly improves the antibacterial effect of the Sophora flavescens extract. At the same time, betaine can regulate the acid-base balance and strong oxidizing property of the Sophora flavescens extract, and can prolong the antibacterial durability of the Sophora flavescens extract.

[0139] In the pretreatment process of Example 9, calcination is not performed. As can be seen from Table 1, the initial inhibition rate against Escherichia coli and Staphylococcus aureus reaches 94.98%, and the initial inhibition rate against Chaetomium globosum and Aspergillus flavus reaches 94.89%. After washing 60 times, the initial inhibition rate against Escherichia coli and Staphylococcus aureus reaches 90.22%, and the initial inhibition rate against Chaetomium globosum and Aspergillus flavus reaches 90.45%, indicating that calcination removes organic impurities in the diatomaceous earth, increases the microporous permeability of the diatomaceous earth, enhances the subsequent adsorption performance of the diatomaceous earth, and facilitates the subsequent combination with nano-titanium dioxide.

[0140] Example 10 No carbon nanotubes were added during the pretreatment of diatomaceous earth. As can be seen from Table 1, the initial inhibition rate against Escherichia coli and Staphylococcus aureus reached 85.86%, and the initial inhibition rate against Chaetomium globosum and Aspergillus flavus reached 85.72%. After washing with water 60 times, the initial inhibition rate against Escherichia coli and Staphylococcus aureus reached 80.17%, and the initial inhibition rate against Chaetomium globosum and Aspergillus flavus reached 80.82%, indicating that the carbon nanotubes are loaded in the pores of the diatomaceous earth. The carbon nanotubes have good antibacterial properties, and together with nano-titanium dioxide and chitosan, the antibacterial properties of the non-woven material are improved.

[0141] In Example 11, no acetate fiber was added during the pretreatment of diatomaceous earth. As can be seen from Table 1, the initial inhibition rate against Escherichia coli and Staphylococcus aureus reached 87.76%, and the initial inhibition rate against Chaetomium globosum and Aspergillus flavus reached 87.56%. After washing 60 times, the initial inhibition rate against Escherichia coli and Staphylococcus aureus reached 81.85%, and the initial inhibition rate against Chaetomium globosum and Aspergillus flavus reached 80.82%, indicating that acetate fiber has antibacterial properties, can increase the antibacterial properties of non-woven materials, and can improve the structural characteristics of diatomaceous earth, which will help the subsequent loading of other components.

[0142] In Examples 14-15, the mass ratio of diatomaceous earth, carbon nanotubes and cellulose acetate was changed. As can be seen from Table 1, compared with Examples 1 and 12-13, the initial inhibition rates of Escherichia coli, Staphylococcus aureus, Chaetomium globosum and Aspergillus flavus were higher than those in Examples 10-11, but lower than those in Examples 1 and 12-13. After washing with water 60 times, the initial inhibition rates of Escherichia coli, Staphylococcus aureus, Chaetomium globosum and Aspergillus flavus were higher than those in Examples 10-11, but lower than those in Examples 1 and 12-13, indicating that the combination of cellulose acetate, carbon nanotubes and diatomaceous earth can form a three-dimensional network structure, have a synergistic effect, and jointly improve the antibacterial and antibacterial durability of diatomaceous earth.

[0143] Comparative Examples 1-2 change the amount of raw materials used in the non-woven material. As can be seen from Table 1, compared with Example 1, the initial antibacterial rates against Escherichia coli, Staphylococcus aureus, Chaetomium globosum and Aspergillus flavus are greatly reduced. At the same time, after washing 60 times, the initial antibacterial rates against Escherichia coli, Staphylococcus aureus, Chaetomium globosum and Aspergillus flavus also decrease significantly, indicating that the raw material components are formulated according to a certain content ratio so that the product has good antibacterial properties, and the change in the amount of each raw material affects the antibacterial properties and antibacterial durability of the non-woven material.

[0144] In Comparative Example 3, no Sophora flavescens extract was added, in Comparative Example 4, no chitosan was added, and in Comparative Example 5, no nano-titanium dioxide was added. As can be seen from Table 1, the initial inhibition rate against Escherichia coli and Staphylococcus aureus reached about 75%, and the initial inhibition rate against Chaetomium globosum and Aspergillus flavus reached about 72%. After washing with water 60 times, the initial inhibition rate against Escherichia coli and Staphylococcus aureus reached about 58%, and the initial inhibition rate against Chaetomium globosum and Aspergillus flavus reached about 60%, indicating that not adding a single Sophora flavescens extract, chitosan, or nano-titanium dioxide has a huge impact on the antibacterial properties of the non-woven material, and greatly reduces the antibacterial durability of the material. Compared with other embodiments, it can be seen that the components cooperate with each other and have a synergistic effect to jointly improve the antibacterial properties and antibacterial durability of the non-woven material.

[0145] The diatomaceous earth in Comparative Example 6 is commercially available. As can be seen from Table 1, the initial antibacterial rate against Escherichia coli and Staphylococcus aureus reaches 88.15%, and the initial antibacterial rate against Chaetomium globosum and Aspergillus flavus reaches 88.22%. After washing 60 times, the initial antibacterial rate against Escherichia coli and Staphylococcus aureus reaches 79.64%, and the initial antibacterial rate against Chaetomium globosum and Aspergillus flavus reaches 79.68%, indicating that the diatomaceous earth prepared in this application has good adsorption properties and can be combined with components such as nano-titanium dioxide and chitosan to jointly improve the antibacterial and antibacterial durability of the non-woven material.

[0146] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but as long as they are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. A moisture-absorbing and breathable nonwoven material, characterized in that: The invention comprises two layers of PP spunbond nonwoven material, wherein an adhesive is bonded between the two layers of PP spunbond nonwoven material, and an antibacterial layer is coated on the side of the two layers of PP spunbond nonwoven material away from the adhesive; the raw material components of the antibacterial layer include the following raw materials, in parts by weight: 10-30 parts of Sophora flavescens extract, 25-45 parts of chitosan, 5-10 parts of nano-titanium dioxide, 80-120 parts of anhydrous ethanol, 90-110 parts of malic acid, 12-18 parts of modified diatomaceous earth, and 3-5 parts of a film-forming aid; The preparation method of the Sophora flavescens extract comprises the following steps: (1) Slice and crush the root of Sophora flavescens, add anhydrous ethanol and soak for 12-14 hours, then add ethanol to a mass concentration of 60-80%, heat and extract at 50-60°C for 3-8 hours, filter and obtain a filtrate; (2) adding bamboo vinegar and betaine to the filtrate obtained in step (1), stirring at 30-45° C. for 2-4 hours to obtain a Sophora flavescens extract; The mass ratio of the sophora flavescens root, bamboo vinegar and betaine is 1:10-18:0.5-0.9; The modified diatomaceous earth is pretreated by the following method: (1) calcining diatomaceous earth at a temperature of 800-1000°C for 2-3 hours, then adding sodium hydroxide and soaking for 1-2 hours to obtain pretreated diatomaceous earth; (2) Dispersing the carbon nanotubes in ethanol, then adding them to the diatomaceous earth obtained in step (1), ultrasonicating for 12-14 hours, and setting aside; (3) Adding the diatomaceous earth treated in step (2) to cellulose acetate, stirring for 12-14 hours, and drying to obtain modified diatomaceous earth; The mass ratio of the diatomaceous earth, carbon nanotubes and acetate fiber is 1:0.3-0.6:0.1-0.

3.

2. The moisture-absorbing and breathable nonwoven material according to claim 1, characterized in that: The adhesive is water-based polyurethane.

3. The moisture-absorbing and breathable nonwoven material according to claim 1, characterized in that: The two PP spunbond nonwoven material layers are both prepared by a spunbond method.

4. The moisture-absorbing and breathable nonwoven material according to claim 1, characterized in that: The film-forming aid is one or more of ethylene glycol, propylene glycol and hexylene glycol.

5. The method for preparing a moisture-absorbing and breathable nonwoven material according to any one of claims 1 to 4, characterized in that: The method comprises the following steps: (1) first dissolving chitosan in malic acid, then adding Sophora flavescens extract, and stirring for 2-5 hours to obtain a mixture 1; (2) uniformly mixing nano titanium dioxide, anhydrous ethanol, modified diatomaceous earth and a film-forming aid to obtain a mixture 2; (3) adding the mixture 1 obtained in step (1) to the mixture 2 obtained in step (2), and continuing stirring at a stirring temperature of 80-90° C. for 2-5 hours to obtain an antibacterial layer.

6. The method for preparing a moisture-absorbing and breathable nonwoven material according to claim 5, wherein: In the step (1), the temperature during stirring is 50-60°C.

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