A high-strength breathable and waterproof non-woven fabric coating

Abstract

The invention relates to the field of coatings, and discloses a high-strength, breathable and waterproof non-woven fabric coating. The coating is formed by applying a composite modified coating on a non-woven fabric base layer and drying the coating. The composite modified coating comprises: waterborne polyurethane, a modified additive, a leveling agent, a defoamer, a thickener, a film-forming aid and deionized water. The modified additive is prepared by grafting modified mesoporous titanium dioxide and modified graphene oxide with isocyanate propyl triethoxysilane. The modified mesoporous titanium dioxide is formed by aldehyde-modifying mesoporous titanium dioxide with 3-aminopropyl triethoxysilane and glutaraldehyde and then grafting pentaethylenehexamine. The modified graphene oxide is formed by modifying graphene oxide with zinc acetate dihydrate. The composite modified coating is prepared by adding the modified additive and compounding the composite modified coating with a non-woven fabric base material. The prepared non-woven fabric coating has good hydrophobicity, high tensile strength and elongation at break, and excellent antibacterial performance.

Description

Technical Field

[0001] The invention belongs to the technical field of coatings, and in particular relates to a high-strength, breathable and waterproof non-woven fabric coating. Background Art

[0002] Non-woven fabric, also known as non-woven fabric, is a fabric that does not require spinning and weaving. It is made by directional or random arrangement of textile staple fibers or filaments to form a fiber mesh structure, and then reinforced by mechanical, thermal bonding or chemical methods. It is a new generation of environmentally friendly material with the advantages of breathability, flexibility, light weight, easy decomposition, rich colors, low price, and recyclability. It is widely used in smart wearables, artificial intelligence, aerospace and other fields.

[0003] During use, most existing non-woven fabrics have disadvantages such as low mechanical strength, which greatly limits their use. Various functional materials are usually introduced into non-woven fabrics to prepare functional non-woven fabrics. However, due to the uneven dispersion of various functional materials, they are easy to stack, resulting in poor corresponding functionality. In addition, the non-woven fabric itself is not water-resistant, easy to absorb moisture or is not waterproof, and cannot provide water-resistant protection for the items contained therein. As people's health awareness increases and they pay more attention to the quality of life, how to prepare non-woven fabric materials with excellent antibacterial and antimicrobial properties has received more and more attention. Summary of the invention

[0004] In order to solve the deficiencies mentioned in the above-mentioned background technology, the purpose of the present invention is to provide a high-strength, breathable and waterproof non-woven fabric coating. A modified additive component is added to the water-based polyurethane to prepare a composite modified coating and the composite coating is composited with a non-woven fabric substrate. The prepared non-woven fabric coating has good hydrophobicity, high tensile strength and elongation at break, and excellent antibacterial properties.

[0005] The purpose of the present invention can be achieved through the following technical solutions: A high-strength, breathable and waterproof non-woven fabric coating, the coating is formed by applying a composite modified coating on a non-woven fabric base and drying it, the composite modified coating comprises the following components by weight: 40-60 parts of waterborne polyurethane, 5-15 parts of modified additives, 0.2-0.6 parts of leveling agent, 1-2 parts of defoaming agent, 1-2 parts of thickener, 0.5-1.5 parts of film-forming aid, and 5-10 parts of deionized water; The modified additive is prepared by using isocyanate propyl triethoxysilane as a bridging agent to graft modified mesoporous titanium dioxide and modified graphene oxide respectively, wherein the modified mesoporous titanium dioxide is prepared by using 3-aminopropyl triethoxysilane and glutaraldehyde to formaldehyde-modify the mesoporous titanium dioxide and then further grafting pentaethylenehexamine, and the modified graphene oxide is prepared by using zinc acetate dihydrate to modify the graphene oxide.

[0006] Preferably, the non-woven fabric base layer is one of polypropylene non-woven fabric or polyester non-woven fabric.

[0007] Preferably, the preparation method of the modified additive comprises the following steps: (1) ultrasonically dispersing mesoporous titanium dioxide in toluene, adding 3-aminopropyltriethoxysilane, and reflux reacting at 100-115°C for 20-24 hours. After the reaction is completed, filtering, washing, and drying are performed to prepare amino-modified mesoporous titanium dioxide; (2) ultrasonically dispersing amino-modified mesoporous titanium dioxide in deionized water, then adding glutaraldehyde and continuing ultrasonication for 0.5 to 1 hour to prepare aldehyde-modified mesoporous titanium dioxide; (3) taking aldehyde-modified mesoporous titanium dioxide and pentaethylenehexamine into a reactor, adding ethanol solvent to disperse them evenly by ultrasonication, and then stirring and reacting them at 80-95°C for 2-3 hours. After the reaction is completed, filtering, washing and drying are performed to prepare modified mesoporous titanium dioxide; (4) dispersing graphene oxide in anhydrous ethanol by ultrasonic method to obtain graphene oxide dispersion, dissolving zinc acetate dihydrate in anhydrous ethanol, stirring at 75-85°C for 10-20 min, cooling to 35-45°C to obtain a mixed solution, dissolving lithium hydroxide monohydrate in anhydrous ethanol and adding the mixture to the mixed solution, then adding the graphene oxide dispersion and stirring for 45-60 min, adding n-hexane, standing at 0-4°C overnight, and finally centrifuging, washing, and drying to obtain modified graphene oxide; (5) The modified graphene oxide was ultrasonically dispersed in anhydrous ethanol, and isocyanatepropyltriethoxysilane and dibutyltin dilaurate were added. The mixture was stirred and reacted at 40-50°C for 3-5 hours to obtain a suspension. The modified mesoporous titanium dioxide was ultrasonically dispersed in a mixed solution of anhydrous ethanol and deionized water, and then added to the suspension and ultrasonically dispersed evenly. Sodium hydroxide solution was added dropwise to adjust the pH value of the system to 9-11. The mixture was stirred and reacted at 60-85°C for 10-15 hours. After the reaction was completed, the modified additive was prepared by filtering, washing and drying.

[0008] Preferably, in step (3), the mass ratio of the formaldehyde-modified mesoporous titanium dioxide to pentaethylenehexamine is 1:1-2.

[0009] Preferably, in step (4), the mass ratio of graphene oxide to zinc acetate dihydrate is 1:0.5-1.

[0010] Preferably, in step (5), the mass ratio of modified graphene oxide, isocyanatepropyltriethoxysilane and modified mesoporous titanium dioxide is 1-2:3-6:1-3.

[0011] Preferably, the method for preparing mesoporous titanium dioxide in step (1) comprises the following steps: dissolving hexadecyltrimethylammonium bromide in deionized water, adding tetrabutyl titanate and stirring for 2-3 hours, then adding deionized water and anhydrous ethanol, placing under reflux reaction at 80-90°C for 2-4 hours, cooling to room temperature, filtering, washing and drying, placing the obtained product in a mixed solution of concentrated hydrochloric acid and ethanol, stirring and mixing for 42-48 hours, and finally filtering, washing and drying to prepare mesoporous titanium dioxide.

[0012] Preferably, the preparation method of the composite modified coating comprises the following steps: pouring parts by weight of a modifying additive and deionized water into a mixer, stirring and mixing them evenly to obtain a premix, then adding parts by weight of an aqueous polyurethane, a leveling agent, a defoaming agent, and a thickener to the premix and stirring them evenly, and finally adding parts by weight of a film-forming aid and continuing to stir and mix to prepare a composite modified coating.

[0013] Preferably, the leveling agent is sodium polyacrylate; the defoaming agent is one of fatty alcohol polyoxyethylene ether or alkylphenol polyoxyethylene ether; the thickener is polyacrylamide; and the film-forming aid is an alcohol ester compound.

[0014] Beneficial effects of the present invention: The present invention adopts a sol-gel method to prepare mesoporous titanium dioxide, and then uses 3-aminopropyltriethoxysilane to perform amino modification on the mesoporous titanium dioxide, and further uses the aldehyde group at one end of glutaraldehyde to react with the amino mesoporous titanium dioxide to obtain aldehyde-modified mesoporous titanium dioxide, and then the aldehyde-modified mesoporous titanium dioxide and the amino group in the structure of pentaethylenehexamine undergo Schiff base reaction to obtain modified mesoporous titanium dioxide, wherein the synthesized mesoporous titanium dioxide has the advantages of being porous and having a large specific surface area, and has good air permeability and moisture permeability. The Schiff base, as an antibacterial functional group, has special biological activities such as antibacterial, bactericidal, and antiviral. The mesoporous titanium dioxide is chemically modified by the Schiff base reaction between the amino mesoporous titanium dioxide and glutaraldehyde and the aldehyde-modified mesoporous titanium dioxide and pentaethylenehexamine, thereby enhancing the antibacterial effect of the mesoporous titanium dioxide. At the same time, the present invention uses graphene oxide as zinc The invention relates to a storage place for zinc ions. The large sheet structure of graphene oxide is helpful for the dispersion of zinc ions, so that zinc ions are enriched on the graphene oxide sheets, thereby improving the antibacterial activity. Then, isocyanatepropyl triethoxysilane is used as a bridging agent, and the isocyanate group at one end of isocyanatepropyl triethoxysilane is reacted with the amino group in the modified mesoporous titanium dioxide structure by chemical reaction. The silanol groups at the other end of isocyanatepropyl triethoxysilane undergo dehydration condensation reaction to form oligomer siloxane, which is then dehydrated and condensed with the hydroxyl groups in the modified graphene oxide structure to form covalent bonds, so as to prepare a modified additive. Among them, graphene oxide has excellent mechanical properties. The modified mesoporous titanium dioxide is bonded to the graphene oxide sheets through strong chemical bonds, which is beneficial to improving the dispersion uniformity of graphene oxide and giving full play to its mechanical properties. In addition, the introduction of multiple silicon-oxygen bonds is beneficial to improving the waterproofness and heat resistance of the material. The present invention adds a modified additive component to waterborne polyurethane to prepare a composite modified coating and composites it with a non-woven fabric substrate. The composite modified coating forms a film on the surface of the non-woven fabric substrate, and there is a strong hydrogen bond interaction between the modified additive and the surface of the non-woven fabric substrate, which is beneficial to improving the firmness of the combination of the composite modified coating and the non-woven fabric substrate. DETAILED DESCRIPTION

[0015] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0016] Example 1 A method for preparing mesoporous titanium dioxide comprises the following steps: Take 4.7g of hexadecyltrimethylammonium bromide and dissolve it in 48mL of deionized water, add 36g of tetrabutyl titanate and stir for 2h, then add 9mL of deionized water and 36mL of anhydrous ethanol, reflux at 85°C for 4h, cool to room temperature, filter, wash and dry, place the obtained product in a mixed solution of 3mL of concentrated hydrochloric acid and 30mL of ethanol, stir and mix for 48h, finally filter, wash and dry to prepare mesoporous titanium dioxide.

[0017] Example 2 A method for preparing a modified additive comprises the following steps: (1) 2 g of the mesoporous titanium dioxide prepared in Example 1 was ultrasonically dispersed in 100 mL of toluene, 5 g of 3-aminopropyltriethoxysilane was added, and the mixture was refluxed at 110° C. for 24 h. After the reaction was completed, the mixture was filtered, washed, and dried to prepare amino-modified mesoporous titanium dioxide; (2) 2.5 g of amino-modified mesoporous titanium dioxide was ultrasonically dispersed in 100 mL of deionized water, and then 5 mL of glutaraldehyde was added and ultrasonicated for 0.5 h to prepare aldehyde-modified mesoporous titanium dioxide; (3) 2.5 g of aldehyde-modified mesoporous titanium dioxide and 3.2 g of pentaethylenehexamine were placed in a reactor, 120 mL of ethanol solvent was added for ultrasonic dispersion, and then stirred at 90 °C for 3 h. After the reaction was completed, the modified mesoporous titanium dioxide was prepared by filtering, washing and drying; (4) 1 g of graphene oxide was ultrasonically dispersed in 100 mL of anhydrous ethanol to obtain a graphene oxide dispersion, 0.81 g of zinc acetate dihydrate was dissolved in 70 mL of anhydrous ethanol, stirred at 80 ° C for 20 min, cooled to 40 ° C to obtain a mixed solution, 0.28 g of lithium hydroxide monohydrate was dissolved in 40 mL of anhydrous ethanol and added to the mixed solution, and then the graphene oxide dispersion was added and stirred for 55 min, and then 20 mL of n-hexane was added, and the mixture was allowed to stand at 4 ° C overnight. Finally, the mixture was centrifuged, washed, and dried to obtain modified graphene oxide. (5) Take 1 g of modified graphene oxide and ultrasonically disperse it in 100 mL of anhydrous ethanol, add 3.5 g of isocyanatepropyltriethoxysilane and 0.002 g of dibutyltin dilaurate, and stir the mixture at 45 °C for 5 h to obtain a suspension. Take 2 g of modified mesoporous titanium dioxide and ultrasonically disperse it in a mixed solution of 135 mL of anhydrous ethanol and 65 mL of deionized water, then add it to the suspension and ultrasonically disperse it evenly. Add sodium hydroxide solution to adjust the pH value of the system to 10, and stir the mixture at 80 °C for 12 h. After the reaction is completed, filter, wash and dry to prepare the modified additive.

[0018] Example 3 A composite modified coating includes the following components in parts by weight: 41 parts of waterborne polyurethane, 6 parts of the modified additive prepared in Example 2, 0.2 parts of leveling agent sodium polyacrylate, 1 part of defoaming agent fatty alcohol polyoxyethylene ether, 1 part of thickener polyacrylamide, 0.7 parts of film-forming aid TEXANOL, and 5 parts of deionized water.

[0019] The preparation method of the above-mentioned composite modified coating comprises the following steps: taking parts by weight of a modifying additive and deionized water into a mixer, stirring and mixing them evenly to obtain a premix, then adding parts by weight of an aqueous polyurethane, a leveling agent, a defoaming agent, and a thickener to the premix and stirring them evenly, and finally adding parts by weight of a film-forming aid and continuing to stir and mix to prepare a composite modified coating.

[0020] A high-strength, breathable and waterproof non-woven fabric coating is formed by coating a composite modified coating on a polypropylene non-woven fabric base and then drying it.

[0021] Example 4 A composite modified coating includes the following components in parts by weight: 47 parts of waterborne polyurethane, 8 parts of the modified additive prepared in Example 2, 0.4 parts of leveling agent sodium polyacrylate, 1.5 parts of defoaming agent fatty alcohol polyoxyethylene ether, 1.4 parts of thickener polyacrylamide, 1 part of film-forming aid TEXANOL, and 7 parts of deionized water.

[0022] The preparation method of the above-mentioned composite modified coating is the same as that of Example 3.

[0023] A high-strength, breathable and waterproof non-woven fabric coating is formed by coating a composite modified coating on a polypropylene non-woven fabric base and then drying it.

[0024] Example 5 A composite modified coating includes the following components in parts by weight: 58 parts of waterborne polyurethane, 12 parts of the modified additive prepared in Example 2, 0.5 parts of leveling agent sodium polyacrylate, 1.7 parts of defoaming agent fatty alcohol polyoxyethylene ether, 1.8 parts of thickener polyacrylamide, 1.2 parts of film-forming aid TEXANOL, and 10 parts of deionized water.

[0025] The preparation method of the above-mentioned composite modified coating is the same as that of Example 3.

[0026] A high-strength, breathable and waterproof non-woven fabric coating is formed by coating a composite modified coating on a polypropylene non-woven fabric base and then drying it.

[0027] Comparative Example 1 A method for preparing a modified additive comprises the following steps: (1) 2 g of the mesoporous titanium dioxide prepared in Example 1 was ultrasonically dispersed in 100 mL of toluene, 5 g of 3-aminopropyltriethoxysilane was added, and the mixture was refluxed at 110° C. for 24 h. After the reaction was completed, the mixture was filtered, washed, and dried to prepare amino-modified mesoporous titanium dioxide; (2) 1 g of graphene oxide was ultrasonically dispersed in 100 mL of anhydrous ethanol to obtain a graphene oxide dispersion, 0.81 g of zinc acetate dihydrate was dissolved in 70 mL of anhydrous ethanol, stirred at 80 ° C for 20 min, cooled to 40 ° C to obtain a mixed solution, 0.28 g of lithium hydroxide monohydrate was dissolved in 40 mL of anhydrous ethanol and added to the mixed solution, and then the graphene oxide dispersion was added and stirred for 55 min, and then 20 mL of n-hexane was added, and the mixture was allowed to stand at 4 ° C overnight. Finally, the mixture was centrifuged, washed, and dried to obtain modified graphene oxide. (3) Take 1 g of modified graphene oxide and ultrasonically disperse it in 100 mL of anhydrous ethanol, add 3.5 g of isocyanatepropyltriethoxysilane and 0.002 g of dibutyltin dilaurate, and stir the mixture at 45 °C for 5 h to obtain a suspension. Take 2 g of amino-modified mesoporous titanium dioxide and ultrasonically disperse it in a mixed solution of 135 mL of anhydrous ethanol and 65 mL of deionized water, then add it to the suspension and ultrasonically disperse it evenly. Add sodium hydroxide solution to adjust the pH value of the system to 10, and stir the mixture at 80 °C for 12 h. After the reaction is completed, filter, wash and dry to prepare a modified additive.

[0028] Comparative Example 2 A method for preparing a modified additive comprises the following steps: (1) 2 g of the mesoporous titanium dioxide prepared in Example 1 was ultrasonically dispersed in 100 mL of toluene, 5 g of 3-aminopropyltriethoxysilane was added, and the mixture was refluxed at 110° C. for 24 h. After the reaction was completed, the mixture was filtered, washed, and dried to prepare amino-modified mesoporous titanium dioxide; (2) 2.5 g of amino-modified mesoporous titanium dioxide was ultrasonically dispersed in 100 mL of deionized water, and then 5 mL of glutaraldehyde was added and ultrasonicated for 0.5 h to prepare aldehyde-modified mesoporous titanium dioxide; (3) 2.5 g of aldehyde-modified mesoporous titanium dioxide and 3.2 g of pentaethylenehexamine were placed in a reactor, 120 mL of ethanol solvent was added for ultrasonic dispersion, and then stirred at 90 °C for 3 h. After the reaction was completed, the modified mesoporous titanium dioxide was prepared by filtering, washing and drying; (4) Take 1 g of graphene oxide and ultrasonically disperse it in 100 mL of anhydrous ethanol, add 3.5 g of isocyanatepropyltriethoxysilane and 0.002 g of dibutyltin dilaurate, and stir the mixture at 45 °C for 5 h to obtain a suspension. Take 2 g of modified mesoporous titanium dioxide and ultrasonically disperse it in a mixed solution of 135 mL of anhydrous ethanol and 65 mL of deionized water, then add it to the suspension and ultrasonically disperse it evenly. Add sodium hydroxide solution to adjust the pH value of the system to 10, and stir the mixture at 80 °C for 12 h. After the reaction is completed, filter, wash and dry to prepare a modified additive.

[0029] Comparative Example 3 A composite modified coating includes the following components in parts by weight: 58 parts of waterborne polyurethane, 12 parts of the modified additive prepared in Comparative Example 1, 0.5 parts of leveling agent sodium polyacrylate, 1.7 parts of defoaming agent fatty alcohol polyoxyethylene ether, 1.8 parts of thickener polyacrylamide, 1.2 parts of film-forming aid TEXANOL, and 10 parts of deionized water.

[0030] The preparation method of the above-mentioned composite modified coating is the same as that of Example 3.

[0031] A high-strength, breathable and waterproof non-woven fabric coating is formed by coating a composite modified coating on a polypropylene non-woven fabric base and then drying it.

[0032] Comparative Example 4 A composite modified coating includes the following components in parts by weight: 58 parts of waterborne polyurethane, 12 parts of the modified additive prepared in Comparative Example 2, 0.5 parts of leveling agent sodium polyacrylate, 1.7 parts of defoaming agent fatty alcohol polyoxyethylene ether, 1.8 parts of thickener polyacrylamide, 1.2 parts of film-forming aid TEXANOL, and 10 parts of deionized water.

[0033] The preparation method of the above-mentioned composite modified coating is the same as that of Example 3.

[0034] A high-strength, breathable and waterproof non-woven fabric coating is formed by coating a composite modified coating on a polypropylene non-woven fabric base and then drying it.

[0035] Comparative Example 5 A composite modified coating includes the following components in parts by weight: 58 parts of waterborne polyurethane, 8 parts of mesoporous titanium dioxide prepared in Example 1, 4 parts of graphene oxide, 0.5 parts of leveling agent sodium polyacrylate, 1.7 parts of defoaming agent fatty alcohol polyoxyethylene ether, 1.8 parts of thickener polyacrylamide, 1.2 parts of film-forming aid TEXANOL, and 10 parts of deionized water.

[0036] The preparation method of the above-mentioned composite modified coating is the same as that of Example 3.

[0037] A high-strength, breathable and waterproof non-woven fabric coating is formed by coating a composite modified coating on a polypropylene non-woven fabric base and then drying it.

[0038] Performance Testing The non-woven fabric coatings prepared in Examples 3-5 and Comparative Examples 3-5 were subjected to performance tests: the water contact angle on the surface of the sample was tested using a JGW-360 fully automatic optical contact angle meter to perform a water resistance test; the tensile strength and elongation at break were tested using an electronic tensile testing machine in accordance with GB / T 24218.3-2010; the antibacterial performance was tested in accordance with GB / T 20944.3-2008, and the antibacterial rate was calculated according to the formula: Antibacterial rate = (AB) / A × 100%, where: A represents the number of colonies of the blank control sample after culturing for 24 hours; B represents the number of colonies of the sample after culturing for 24 hours, and the colonies were cultured in a DH3600 constant temperature incubator, and the data results are shown in Table 1.

[0039] Table 1 Test results of sample performance

[0040] It can be seen from the data in Table 1 that the water contact angles of the non-woven fabric coatings prepared in Examples 3-5 of the present invention are all greater than 90°, and they have hydrophobic surfaces, high tensile strength and elongation at break, and excellent antibacterial properties. Among them, the modified additive component in Comparative Example 3 is prepared by grafting modified graphene oxide and amino-modified mesoporous titanium dioxide with isocyanatepropyltriethoxysilane, and the modified additive component in Comparative Example 4 does not modify the graphene oxide. The antibacterial rates of Escherichia coli and Staphylococcus aureus measured in Comparative Examples 3-4 are lower than those in Examples 3-5, indicating that the generation of Schiff base and the enrichment of zinc ions can improve the antibacterial effect of the material to a certain extent. In Comparative Example 5, mesoporous titanium dioxide and graphene oxide are simply mixed, and the measured water contact angle, tensile strength, elongation at break, antibacterial rate of Escherichia coli and antibacterial rate of Staphylococcus aureus are significantly lower than those in Examples 3-5. The reason is that the mechanical properties are reduced due to the agglomeration phenomenon of mesoporous titanium dioxide and graphene oxide, and the hydrophobic properties are reduced due to the lack of introduction of silicon-oxygen bonds.

[0041] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0042] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. A high-strength, breathable and waterproof non-woven fabric coating, characterized in that: The coating is formed by applying a composite modified coating on a non-woven fabric base and drying it, wherein the composite modified coating comprises the following components by weight: 40-60 parts of waterborne polyurethane, 5-15 parts of modified additives, 0.2-0.6 parts of leveling agent, 1-2 parts of defoaming agent, 1-2 parts of thickener, 0.5-1.5 parts of film-forming aid, and 5-10 parts of deionized water; The modified additive is prepared by using isocyanate propyl triethoxysilane as a bridging agent to graft modified mesoporous titanium dioxide and modified graphene oxide respectively, wherein the modified mesoporous titanium dioxide is prepared by using 3-aminopropyl triethoxysilane and glutaraldehyde to formaldehyde-modify the mesoporous titanium dioxide and then further grafting pentaethylenehexamine, and the modified graphene oxide is prepared by using zinc acetate dihydrate to modify the graphene oxide.

2. The high-strength breathable and waterproof non-woven fabric coating according to claim 1, characterized in that: The non-woven fabric base layer is one of polypropylene non-woven fabric or polyester non-woven fabric.

3. The high-strength, breathable and waterproof non-woven fabric coating according to claim 1, characterized in that: The preparation method of the modified additive comprises the following steps: (1) ultrasonically dispersing mesoporous titanium dioxide in toluene, adding 3-aminopropyltriethoxysilane, and reflux reacting at 100-115°C for 20-24 hours. After the reaction is completed, filtering, washing, and drying are performed to prepare amino-modified mesoporous titanium dioxide; (2) ultrasonically dispersing amino-modified mesoporous titanium dioxide in deionized water, then adding glutaraldehyde and continuing ultrasonication for 0.5 to 1 hour to prepare aldehyde-modified mesoporous titanium dioxide; (3) taking aldehyde-modified mesoporous titanium dioxide and pentaethylenehexamine into a reactor, adding ethanol solvent to disperse them evenly by ultrasonication, and then stirring and reacting them at 80-95°C for 2-3 hours. After the reaction is completed, filtering, washing and drying are performed to prepare modified mesoporous titanium dioxide; (4) dispersing graphene oxide in anhydrous ethanol by ultrasonic method to obtain graphene oxide dispersion, dissolving zinc acetate dihydrate in anhydrous ethanol, stirring at 75-85°C for 10-20 min, cooling to 35-45°C to obtain a mixed solution, dissolving lithium hydroxide monohydrate in anhydrous ethanol and adding the mixture to the mixed solution, then adding the graphene oxide dispersion and stirring for 45-60 min, adding n-hexane, standing at 0-4°C overnight, and finally centrifuging, washing, and drying to obtain modified graphene oxide; (5) The modified graphene oxide was ultrasonically dispersed in anhydrous ethanol, and isocyanatepropyltriethoxysilane and dibutyltin dilaurate were added. The mixture was stirred and reacted at 40-50°C for 3-5 hours to obtain a suspension. The modified mesoporous titanium dioxide was ultrasonically dispersed in a mixed solution of anhydrous ethanol and deionized water, and then added to the suspension and ultrasonically dispersed evenly. Sodium hydroxide solution was added dropwise to adjust the pH value of the system to 9-11. The mixture was stirred and reacted at 60-85°C for 10-15 hours. After the reaction was completed, the modified additive was prepared by filtering, washing and drying.

4. The high-strength breathable and waterproof non-woven fabric coating according to claim 3, characterized in that: In the step (3), the mass ratio of the formaldehyde-modified mesoporous titanium dioxide to pentaethylenehexamine is 1:1-2.

5. The high-strength breathable and waterproof non-woven fabric coating according to claim 3, characterized in that: In the step (4), the mass ratio of graphene oxide to zinc acetate dihydrate is 1:0.5-1.

6. The high-strength breathable and waterproof nonwoven fabric coating according to claim 3, characterized in that: In the step (5), the mass ratio of modified graphene oxide, isocyanatepropyltriethoxysilane and modified mesoporous titanium dioxide is 1-2:3-6:1-3.

7. The high-strength, breathable and waterproof nonwoven fabric coating according to claim 3, characterized in that: The method for preparing mesoporous titanium dioxide in step (1) comprises the following steps: dissolving hexadecyltrimethylammonium bromide in deionized water, adding tetrabutyl titanate and stirring for 2-3 hours, then adding deionized water and anhydrous ethanol, placing the mixture under reflux at 80-90° C. for 2-4 hours, cooling to room temperature, filtering, washing and drying the mixture, placing the obtained product in a mixed solution of concentrated hydrochloric acid and ethanol, stirring and mixing for 42-48 hours, and finally filtering, washing and drying the mixture to obtain mesoporous titanium dioxide.

8. The high-strength breathable and waterproof nonwoven fabric coating according to claim 1, characterized in that: The preparation method of the composite modified coating comprises the following steps: taking parts by weight of a modifying additive and deionized water into a mixer, stirring and mixing them evenly to obtain a premix, then adding parts by weight of an aqueous polyurethane, a leveling agent, a defoaming agent, and a thickener to the premix and stirring them evenly, and finally adding parts by weight of a film-forming aid and continuing to stir and mix them evenly to prepare the composite modified coating.

9. The high-strength, breathable and waterproof nonwoven fabric coating according to claim 1, characterized in that: The leveling agent is sodium polyacrylate; the defoaming agent is one of fatty alcohol polyoxyethylene ether or alkylphenol polyoxyethylene ether; the thickener is polyacrylamide; and the film-forming aid is an alcohol ester compound.

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