Waterproof breathable polyurethane fabric and preparation method thereof

Abstract

The invention belongs to the technical field of polyurethane fabrics, and provides a waterproof breathable polyurethane fabric and a preparation method thereof.The waterproof breathable polyurethane fabric comprises a base cloth and a polyurethane coating arranged on the surface of the base cloth; the preparation raw materials of the polyurethane coating comprise the following components in parts by weight: 60-85 parts of polyurethane, 2-6 parts of modified graphene oxide, 3-8 parts of modified titanium dioxide, 20-30 parts of absolute ethyl alcohol, 2-4 parts of a catalyst, 1-3 parts of a plasticizer and 0.01-0.05 part of a defoaming agent. The preparation method comprises the following steps: step 1, weighing polyurethane, modified graphene oxide, modified titanium dioxide, absolute ethyl alcohol, a catalyst, a plasticizer and a defoaming agent in parts by weight, mixing, heating and preserving heat to obtain a polyurethane coating; 2, the surface of base cloth is coated with the polyurethane coating, the base cloth coated with the polyurethane coating is pressed and then dried, and the waterproof and breathable polyurethane fabric is obtained.

Description

Technical Field

[0001] The present invention belongs to the technical field of polyurethane fabrics, and particularly relates to a waterproof and breathable polyurethane fabric and a preparation method thereof. Background Art

[0002] With the continuous improvement of people's living quality and the continuous progress of the textile industry, some basic functions of traditional textiles can no longer meet people's needs, and various functional textiles have received extensive attention. Waterproof fabrics are common functional fabrics, which have the functions of preventing rainwater and discharging sweat gas in the body, and are deeply welcomed by consumers.

[0003] There are many studies on waterproof, moisture-permeable and breathable fabrics in the prior art. Currently, there are three solutions: high-density fabrics treated with water-repellent treatment, laminated fabrics and coated fabrics. Among these three methods, coated fabrics are widely used because of their low cost and simple production process. Coated fabrics are usually composed of high-molecular waterproof and breathable materials plus fabrics. Although PTFE fabrics have good waterproof and moisture-permeable properties, they generally have poor handfeel, poor washing fastness and wind resistance. In particular, they are not easily degraded naturally, have a high combustion temperature, and thus will cause damage to the environment. At the same time, coating processes and composite processes are the most common in the field of waterproof fabric preparation. Among them, the coating process is to coat waterproof coatings on the fabric surface to make the fabric have waterproof performance, but the coating treatment of the fabric will correspondingly affect its air permeability, moisture permeability and wearing comfort.

[0004] Polyurethane has unique flexibility, wear resistance, antibacterial properties and good texture, and is widely used in the preparation of medium and high-end fabrics. Polyurethane fabrics have the advantages of soft handfeel, high strength, waterproof and breathable, etc. Therefore, how to further improve the air permeability and mechanical properties of polyurethane fabrics has a positive impact on the improvement of the comprehensive performance of waterproof fabrics. Summary of the Invention

[0005] The purpose of the present invention is to provide a waterproof and breathable polyurethane fabric and a preparation method thereof. The preparation method of the polyurethane fabric of the present invention is simple and has low economic cost; at the same time, the polyurethane fabric has excellent waterproof and breathable properties and antibacterial properties, a long service life, high flexibility and comfort of the polyurethane fabric, and meets the needs of the high-end market.

[0006] The purpose of the present invention can be achieved by the following technical solutions:

[0007] The first aspect of the present invention provides a waterproof and breathable polyurethane fabric, which includes a base fabric and a polyurethane coating provided on the surface of the base fabric;

[0008] The preparation raw materials of the polyurethane coating include the following components in parts by weight:

[0009] 60 - 85 parts of polyurethane, 2 - 6 parts of modified graphene oxide, 3 - 8 parts of modified titanium dioxide, 20 - 30 parts of absolute ethanol, 2 - 4 parts of catalyst, 1 - 3 parts of plasticizer, 0.01 - 0.05 parts of defoamer.

[0010] As a preferred embodiment of the present invention, the modified graphene oxide is prepared by the following steps:

[0011] Add graphene oxide into deionized water, ultrasonically disperse until uniform, add 1 - ethyl-(3 - dimethylaminopropyl)carbodiimide hydrochloride and N - hydroxysuccinimide, stir for 0.5 - 1 h, add 1.0 - 1.5 g of chitosan, raise the temperature to 55 - 60 °C, continue to stir for 5 - 6 h, let it stand for layer separation, centrifuge and filter, and obtain modified graphene oxide after drying. Through the above technical solution, the amino group on chitosan undergoes a dehydration condensation reaction with the carboxyl group on graphene oxide to coat on the surface of graphene oxide, improving the dispersion performance of graphene oxide, enhancing the antibacterial property of graphene oxide at the same time, thereby promoting the fabric to have excellent antibacterial property and prolonging the service life of the fabric.

[0012] As a preferred embodiment of the present invention, the dosage ratio of graphene oxide, deionized water, 1 - ethyl-(3 - dimethylaminopropyl)carbodiimide hydrochloride, N - hydroxysuccinimide and chitosan is 1.0 - 1.5 g : 100 mL : 0.35 - 0.42 g : 0.30 - 0.35 g : 1.0 - 1.5 g.

[0013] As a preferred embodiment of the present invention, the modified titanium dioxide is prepared by the following steps:

[0014] Add silane coupling agent KH - 550 and nano - titanium dioxide into absolute ethanol and deionized water, ultrasonically disperse until uniform, adjust the pH value to 4.0 - 4.5, stir and react for 6 - 8 h, centrifuge and wash, and vacuum dry to obtain modified titanium dioxide. Through the above technical solution, the surface chemical modification of nano - titanium dioxide with silane coupling agent KH - 550 can effectively extend the stability of the nano - titanium dioxide particle distribution and reduce the agglomeration phenomenon of nano - titanium dioxide, improve the dispersion performance of nano - titanium dioxide, and thus improve the interaction with the composite material.

[0015] As a preferred embodiment of the present invention, the dosage ratio of silane coupling agent KH - 550, nano - titanium dioxide, absolute ethanol and deionized water is 5 - 6 mL : 2.5 - 3.0 g : 40 mL : 10 mL.

[0016] As a preferred embodiment of the present invention, the catalyst is at least one of dibutyltin dilaurate, stannous octoate, dimethyltin dinovate.

[0017] As a preferred embodiment of the present invention, the plasticizer is at least one of chlorinated paraffin, chlorinated palm oil, and diisononyl phthalate.

[0018] As a preferred embodiment of the present invention, the defoamer is at least one of polyoxyethylene polyoxypropylene pentaerythritol ether and polyoxyethylene polyoxypropylene alkanolamine ether.

[0019] As a preferred embodiment of the present invention, the thickness of the polyurethane coating is 30 - 80 μm.

[0020] The second aspect of the present invention provides a method for preparing a waterproof and breathable polyurethane fabric, comprising the following steps:

[0021] Step 1: Weigh by weight parts, mix polyurethane, modified graphene oxide, modified titanium dioxide, absolute ethanol, catalyst, plasticizer, and defoamer, heat up to 100 - 120 °C, and keep warm for 30 - 60 min to obtain a polyurethane coating.

[0022] Step 2: Coat the polyurethane coating on the surface of the base fabric, perform pressing treatment on the base fabric coated with the polyurethane coating, and then dry at 80 - 85 °C for 30 - 50 min to obtain a waterproof and breathable polyurethane fabric.

[0023] Advantages of the present invention:

[0024] A waterproof and breathable polyurethane fabric provided by the present invention is formed by coating a polyurethane coating on the surface of a base fabric. The obtained polyurethane fabric has excellent waterproof, moisture-proof, breathable, and mechanical properties, and also has certain antibacterial properties.

[0025] The polyurethane coating provided in the present invention is obtained by mixing polyurethane, modified graphene oxide, modified titanium dioxide, absolute ethanol, catalyst, plasticizer, and defoamer. It has high air permeability and moisture permeability, facilitating the discharge of moisture and heat generated by the human body after exercise, keeping the human body in a relatively comfortable state at all times, improving the comfort performance of the polyurethane fabric, and further expanding the application of the polyurethane fabric in the clothing field. Modified titanium dioxide in the raw materials is evenly dispersed in the composite material, effectively enhancing the air permeability and waterproof performance of the composite material. Due to the incompatibility between titanium dioxide and polyurethane at the interface, phase separation occurs, and the pores formed by the phase separation can provide more channels for the transmission of water vapor and other gases, thus greatly improving the air permeability of the composite material. The addition of modified graphene oxide in the raw materials can effectively improve the tensile strength, elongation at break, and thermal stability of the composite material. In addition, modified graphene oxide also has excellent antibacterial properties, thus endowing the polyurethane fabric with certain antibacterial properties and extending its service life.

[0026] A preparation method of a waterproof and breathable polyurethane fabric provided in the present invention obtains a polyurethane fabric with high mechanical properties, excellent waterproof, moisture-proof and breathable properties, and certain antibacterial properties by adjusting the composition design of the polyurethane coating and the preparation process conditions. Detailed implementation manners

[0027] Next, the technical solutions of the present invention will be clearly and completely described in conjunction with the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention. Obviously, the following description is only some examples or embodiments of the present application. For those of ordinary skill in the art, without creative efforts, the present application can also be applied to other similar scenarios. In addition, it can also be understood that although the efforts made in this development process may be complex and lengthy, for those of ordinary skill in the art related to the content disclosed in the present application, some designs, manufacturing or production changes based on the technical content disclosed in the present application are only conventional technical means and should not be understood as the content disclosed in the present application being insufficient.

[0028] However, there will be cases where unnecessary detailed descriptions are omitted. For example, there are cases where the detailed descriptions of well-known matters are omitted and the repeated descriptions of actually identical structures are omitted. This is to avoid the following description from becoming unnecessarily lengthy and to facilitate the understanding of those skilled in the art. In addition, the following description is provided for those skilled in the art to fully understand the present application and is not intended to limit the subject matter recited in the claims.

[0029] Example 1

[0030] This example provides a waterproof and breathable polyurethane fabric and its preparation method:

[0031] A waterproof and breathable polyurethane fabric includes a base fabric and a polyurethane coating (with a thickness of 40 μm) provided on the surface of the base fabric;

[0032] The preparation raw materials of the polyurethane coating include the following components in parts by weight:

[0033] 60 parts of polyurethane, 2 parts of modified graphene oxide, 3 parts of modified titanium dioxide, 20 parts of anhydrous ethanol, 2 parts of dibutyltin dilaurate, 1 part of chlorinated paraffin, 0.01 part of polyoxyethylene polyoxypropylene pentaerythritol ether.

[0034] The preparation steps of the modified graphene oxide are as follows:

[0035] Add 1.0 g of graphene oxide to 100 mL of deionized water, ultrasonically disperse it until uniform, add 0.35 g of 1-ethyl-(3-dimethylaminopropyl)carbodiimide hydrochloride and 0.30 g of N-hydroxysuccinimide, stir for 0.5 h, add 1.0 g of chitosan, heat up to 60 °C, continue stirring for 6 h, let it stand for layering, centrifuge and filter, and obtain modified graphene oxide after drying.

[0036] The preparation steps of the modified titanium dioxide are as follows:

[0037] Add 5 mL of silane coupling agent KH-550 and 2.5 g of nano-titanium dioxide to 40 mL of absolute ethanol and 10 mL of deionized water, ultrasonically disperse it until uniform, adjust the pH value to 4.0, stir and react for 6 h, centrifuge and wash, and dry in a vacuum oven at 80 °C for 10 h to obtain modified titanium dioxide.

[0038] Among them, the preparation method of the waterproof and breathable polyurethane fabric includes the following steps:

[0039] Step 1: Weigh by weight parts, mix polyurethane, modified graphene oxide, modified titanium dioxide, absolute ethanol, catalyst, plasticizer and defoamer, heat up to 100 °C, and keep warm for 60 min to obtain polyurethane coating;

[0040] Step 2: Coat the polyurethane coating on the surface of the base fabric, press the base fabric coated with the polyurethane coating, and then dry it at 85 °C for 50 min to obtain the waterproof and breathable polyurethane fabric.

[0041] Example 2

[0042] Compared with Example 1, the difference is only that the preparation steps of the modified graphene oxide are different:

[0043] Add 1.5 g of graphene oxide to 100 mL of deionized water, ultrasonically disperse it until uniform, add 0.42 g of 1-ethyl-(3-dimethylaminopropyl)carbodiimide hydrochloride and 0.35 g of N-hydroxysuccinimide, stir for 0.5 h, add 1.5 g of chitosan, heat up to 60 °C, continue stirring for 6 h, let it stand for layering, centrifuge and filter, and obtain modified graphene oxide after drying.

[0044] Example 3

[0045] Compared with Example 1, the difference is only that the preparation steps of the modified titanium dioxide are different:

[0046] Add 6 mL of silane coupling agent KH-550 and 3.0 g of nano-titanium dioxide to 40 mL of absolute ethanol and 10 mL of deionized water, ultrasonically disperse it until uniform, adjust the pH value to 4.0, stir and react for 6 h, centrifuge and wash, and dry in a vacuum oven at 80 °C for 10 h to obtain modified titanium dioxide.

[0047] Example 4

[0048] Compared with Example 1, the difference is only that the dosage of modified graphene oxide in the raw materials of the polyurethane coating is different:

[0049] The raw materials for preparing the polyurethane coating include the following components in parts by weight:

[0050] 60 parts of polyurethane, 4 parts of modified graphene oxide, 3 parts of modified titanium dioxide, 20 parts of absolute ethanol, 2 parts of dibutyltin dilaurate, 1 part of chlorinated paraffin, 0.01 part of polyoxyethylene polyoxypropylene pentaerythritol ether.

[0051] Example 5

[0052] Compared with Example 1, the difference is only that the dosage of modified titanium dioxide in the raw materials of the polyurethane coating is different:

[0053] The raw materials for preparing the polyurethane coating include the following components in parts by weight:

[0054] 60 parts of polyurethane, 2 parts of modified graphene oxide, 5 parts of modified titanium dioxide, 20 parts of absolute ethanol, 2 parts of dibutyltin dilaurate, 1 part of chlorinated paraffin, 0.01 part of polyoxyethylene polyoxypropylene pentaerythritol ether.

[0055] Example 6

[0056] Compared with Example 1, the difference is only that the dosage of the raw materials of the polyurethane coating is different:

[0057] The raw materials for preparing the polyurethane coating include the following components in parts by weight:

[0058] 70 parts of polyurethane, 4 parts of modified graphene oxide, 6 parts of modified titanium dioxide, 25 parts of absolute ethanol, 3 parts of dibutyltin dilaurate, 1.5 parts of chlorinated paraffin, 0.02 part of polyoxyethylene polyoxypropylene pentaerythritol ether.

[0059] Example 7

[0060] Compared with Example 1, the difference is only that the dosage of the raw materials of the polyurethane coating is different:

[0061] The raw materials for preparing the polyurethane coating include the following components in parts by weight:

[0062] 85 parts of polyurethane, 6 parts of modified graphene oxide, 8 parts of modified titanium dioxide, 30 parts of absolute ethanol, 4 parts of dibutyltin dilaurate, 3 parts of chlorinated paraffin, 0.05 part of polyoxyethylene polyoxypropylene pentaerythritol ether.

[0063] Example 8

[0064] Compared with Example 1, the difference is only that the preparation steps of the waterproof and breathable polyurethane fabric are different:

[0065] A method for preparing a waterproof and breathable polyurethane fabric, comprising the following steps:

[0066] Step 1: Weigh by weight parts, mix polyurethane, modified graphene oxide, modified titanium dioxide, anhydrous ethanol, catalyst, plasticizer and defoamer, heat up to 120 °C, and keep warm for 35 min to obtain a polyurethane coating;

[0067] Step 2: Coat the polyurethane coating on the surface of the base fabric, press the base fabric coated with the polyurethane coating, and then dry it at 80 °C for 50 min to obtain the waterproof and breathable polyurethane fabric.

[0068] Comparative Example 1

[0069] Compared with Example 1, the difference is only that modified graphene oxide and modified titanium dioxide are not added to the raw materials of the polyurethane coating:

[0070] A waterproof and breathable polyurethane fabric, comprising a base fabric and a polyurethane coating (with a thickness of 40 μm) provided on the surface of the base fabric;

[0071] The preparation raw materials of the polyurethane coating include the following components in parts by weight:

[0072] 60 parts of polyurethane, 20 parts of anhydrous ethanol, 2 parts of dibutyltin dilaurate, 1 part of chlorinated paraffin, 0.01 part of polyoxyethylene polyoxypropylene pentaerythritol ether.

[0073] Among them, the method for preparing the waterproof and breathable polyurethane fabric includes the following steps:

[0074] Step 1: Weigh by weight parts, mix polyurethane, anhydrous ethanol, catalyst, plasticizer and defoamer, heat up to 100 °C, and keep warm for 60 min to obtain a polyurethane coating;

[0075] Step 2: Coat the polyurethane coating on the surface of the base fabric, press the base fabric coated with the polyurethane coating, and then dry it at 85 °C for 50 min to obtain the waterproof and breathable polyurethane fabric.

[0076] Comparative Example 2

[0077] Compared with Example 1, the difference is only that modified graphene oxide is not added to the raw materials of the polyurethane coating:

[0078] A waterproof and breathable polyurethane fabric, comprising a base fabric and a polyurethane coating (with a thickness of 40 μm) provided on the surface of the base fabric;

[0079] The preparation raw materials of the polyurethane coating include the following components in parts by weight:

[0080] 60 parts of polyurethane, 3 parts of modified titanium dioxide, 20 parts of absolute ethanol, 2 parts of dibutyltin dilaurate, 1 part of chlorinated paraffin, 0.01 part of polyoxyethylene polyoxypropylene pentaerythritol ether.

[0081] Among them, the preparation method of the waterproof and breathable polyurethane fabric includes the following steps:

[0082] Step 1: Weigh according to parts by weight, mix polyurethane, modified titanium dioxide, absolute ethanol, catalyst, plasticizer and defoamer, heat up to 100 °C, and keep warm for 60 min to obtain polyurethane coating;

[0083] Step 2: Coat the polyurethane coating on the surface of the base fabric, press the base fabric coated with the polyurethane coating, and then dry it at 85 °C for 50 min to obtain the waterproof and breathable polyurethane fabric.

[0084] Comparative Example 3

[0085] Compared with Example 1, the difference is only that modified titanium dioxide is not added to the raw materials of the polyurethane coating:

[0086] A waterproof and breathable polyurethane fabric, including a base fabric and a polyurethane coating (with a thickness of 40 μm) provided on the surface of the base fabric;

[0087] The preparation raw materials of the polyurethane coating include the following components in parts by weight:

[0088] 60 parts of polyurethane, 2 parts of modified graphene oxide, 20 parts of absolute ethanol, 2 parts of dibutyltin dilaurate, 1 part of chlorinated paraffin, 0.01 part of polyoxyethylene polyoxypropylene pentaerythritol ether.

[0089] Among them, the preparation method of the waterproof and breathable polyurethane fabric includes the following steps:

[0090] Step 1: Weigh according to parts by weight, mix polyurethane, modified graphene oxide, absolute ethanol, catalyst, plasticizer and defoamer, heat up to 100 °C, and keep warm for 60 min to obtain polyurethane coating;

[0091] Step 2: Coat the polyurethane coating on the surface of the base fabric, press the base fabric coated with the polyurethane coating, and then dry it at 85 °C for 50 min to obtain the waterproof and breathable polyurethane fabric.

[0092] Comparative Example 4

[0093] Compared with Example 1, the difference is only that the dosage of modified graphene oxide in the raw materials of the polyurethane coating is different:

[0094] The preparation raw materials of the polyurethane coating include the following components in parts by weight:

[0095] 60 parts of polyurethane, 1 part of modified graphene oxide, 3 parts of modified titanium dioxide, 20 parts of absolute ethanol, 2 parts of dibutyltin dilaurate, 1 part of chlorinated paraffin, 0.01 part of polyoxyethylene polyoxypropylene pentaerythritol ether.

[0096] Comparative Example 5

[0097] Compared with Example 1, the only difference is the different dosage of modified titanium dioxide in the raw materials of the polyurethane coating:

[0098] The raw materials for preparing the polyurethane coating include the following components in parts by weight:

[0099] 60 parts of polyurethane, 2 parts of modified graphene oxide, 1.5 parts of modified titanium dioxide, 20 parts of absolute ethanol, 2 parts of dibutyltin dilaurate, 1 part of chlorinated paraffin, 0.01 part of polyoxyethylene polyoxypropylene pentaerythritol ether.

[0100] Comparative Example 6

[0101] Compared with Example 1, the only difference is the different dosage of the components in the raw materials of the polyurethane coating:

[0102] The raw materials for preparing the polyurethane coating include the following components in parts by weight:

[0103] 50 parts of polyurethane, 2 parts of modified graphene oxide, 3 parts of modified titanium dioxide, 10 parts of absolute ethanol, 2 parts of dibutyltin dilaurate, 1 part of chlorinated paraffin, 0.01 part of polyoxyethylene polyoxypropylene pentaerythritol ether.

[0104] Comparative Example 7

[0105] Compared with Example 1, the only difference is the different preparation steps of the waterproof and breathable polyurethane fabric:

[0106] Among them, the preparation method of the waterproof and breathable polyurethane fabric includes the following steps:

[0107] Step 1: Weigh according to parts by weight, mix polyurethane, modified graphene oxide, modified titanium dioxide, absolute ethanol, catalyst, plasticizer and defoamer, heat up to 85 °C, and keep warm for 60 min to obtain polyurethane coating;

[0108] Step 2: Coat the polyurethane coating on the surface of the base fabric, press the base fabric coated with the polyurethane coating, and then dry it at 85 °C for 50 min to obtain the waterproof and breathable polyurethane fabric.

[0109] The following performance tests were carried out on Examples 1 - 8 and Comparative Examples 1 - 7:

[0110] 1. Contact angle test: According to DB44T 1872-2016 "Determination of Wettability of Textile Surfaces - Contact Angle Method", a 5 μL deionized water droplet was dropped on the surface of the specimen and left to stand for 30 s. The contact angle was calculated using the five-point fitting method. Five different positions of each specimen were tested, and the results were averaged.

[0111] 2. Hydrostatic pressure resistance test: Using the direct pressure increase method, the fabric was placed on the test holder and the pressure was continuously increased at a rate of 6 kPa / min. When 3 water seepage points appeared on the fabric surface, the pressure value was recorded.

[0112] 3. Air permeability test: According to the national standard GB / T 5433-2008, the air permeability of the sample was tested using a YG461G fully automatic fabric air permeability tester. Among them, the specific experimental parameters were set as follows: the ambient temperature was 25 °C, the relative humidity was 60%, the pressure difference was 100 Pa, and the air permeability area was 20 cm 2 , and the diameter of the air jet nozzle was 0.8 mm; the fabric samples were tested at 10 different positions respectively, and the average value was taken as the final air permeability data.

[0113] 4. Tensile property test: The antibacterial test was carried out in accordance with GB / T 3923.2-2013 Textiles - Tensile properties of fabrics - Part 2: Determination of breaking force (grab method).

[0114] 5. Antibacterial property test: The antibacterial property test was carried out in accordance with GB / T 20944.3-2008 Textiles - Evaluation of antibacterial properties - Part 3: Oscillation method.

[0115] The above test results are shown in Table 1:

[0116] Table 1

[0117]

[0118]

[0119] As can be seen from Table 1, compared with the polyurethane fabrics prepared in Comparative Examples 1-7, the polyurethane fabrics prepared in Examples 1-8 have more excellent mechanical properties, waterproof and breathable properties, and antibacterial properties. Thus, it can be seen that a waterproof and breathable polyurethane fabric and its preparation method provided in the present invention can prepare a polyurethane fabric with high mechanical properties, excellent waterproof, moisture-proof and breathable properties, and certain antibacterial properties. At the same time, the preparation method is simple, the raw materials are easy to obtain, and it is suitable for large-scale production.

[0120] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device. It should be understood that in various embodiments of the present application, the magnitude of the serial numbers of the various processes does not mean the order of execution, and some or all of the steps may be executed in parallel or sequentially. The order of execution of the various processes should be determined by their functions and internal logics, and should not constitute any limitation to the implementation process of the embodiments of the present application regulations.

[0121] Unless otherwise specifically stated, various raw materials, reagents, instruments, equipment, etc. used in this application can be obtained through market purchases or can be prepared by existing methods.

[0122] Unless otherwise specifically stated, all embodiments and optional embodiments of the present application can be combined with each other to form new technical solutions, and all technical features and optional technical features of the present application can be combined with each other to form new technical solutions.

[0123] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A waterproof and breathable polyurethane fabric, characterized in that: It includes a base fabric and a polyurethane coating arranged on the surface of the base fabric; The raw materials for preparing the polyurethane coating include the following components in parts by weight: 60-85 parts of polyurethane, 2-6 parts of modified graphene oxide, 3-8 parts of modified titanium dioxide, 20-30 parts of anhydrous ethanol, 2-4 parts of catalyst, 1-3 parts of plasticizer, and 0.01-0.05 parts of defoaming agent.

2. The waterproof and breathable polyurethane fabric according to claim 1, characterized in that: The modified graphene oxide is prepared by the following steps: Add graphene oxide to deionized water, disperse it evenly with ultrasound, add 1-ethyl-(3-dimethylaminopropyl)carbodiimide hydrochloride and N-hydroxysuccinimide, stir for 0.5-1h, add 1.0-1.5g chitosan, heat to 55-60°C, continue stirring for 5-6h, stand for stratification, centrifuge and filter, and dry to obtain modified graphene oxide.

3. The waterproof and breathable polyurethane fabric according to claim 2, characterized in that: The usage ratio of graphene oxide, deionized water, 1-ethyl-(3-dimethylaminopropyl)carbodiimide hydrochloride, N-hydroxysuccinimide and chitosan is 1.0-1.5 g:100 mL:0.35-0.42 g:0.30-0.35 g:1.0-1.5 g.

4. The waterproof and breathable polyurethane fabric according to claim 1, characterized in that: The modified titanium dioxide is prepared by the following steps: The silane coupling agent KH-550 and nano titanium dioxide are added to anhydrous ethanol and deionized water, ultrasonically dispersed until uniform, the pH value is adjusted to 4.0-4.5, stirred for reaction for 6-8 hours, centrifuged for washing, and vacuum dried to obtain modified titanium dioxide.

5. The waterproof and breathable polyurethane fabric according to claim 4, characterized in that: The dosage ratio of silane coupling agent KH-550, nano titanium dioxide, anhydrous ethanol and deionized water is 5-6 mL: 2.5-3.0 g: 40 mL: 10 mL.

6. The waterproof and breathable polyurethane fabric according to claim 1, characterized in that: The catalyst is at least one of dibutyltin dilaurate, stannous octoate, and dimethyltin diceneodecanoate.

7. The waterproof and breathable polyurethane fabric according to claim 1, characterized in that: The plasticizer is at least one of chlorinated paraffin, chlorinated palm oil, and diisononyl phthalate.

8. The waterproof and breathable polyurethane fabric according to claim 1, characterized in that: The defoaming agent is at least one of polyoxyethylene polyoxypropylene pentaerythritol ether and polyoxyethylene polyoxypropanolamine ether.

9. The waterproof and breathable polyurethane fabric according to claim 1, characterized in that: The thickness of the polyurethane coating is 30-80 μm.

10. The method for preparing a waterproof and breathable polyurethane fabric according to claim 1, characterized in that: The following steps are involved: Step 1, weighing polyurethane, modified graphene oxide, modified titanium dioxide, anhydrous ethanol, a catalyst, a plasticizer and a defoamer according to weight, heating to 100-120° C., and keeping the temperature for 30-60 minutes to obtain a polyurethane coating; Step 2: coating the polyurethane coating on the surface of the base fabric, pressing the base fabric coated with the polyurethane coating, and then drying it at 80-85° C. for 30-50 minutes to obtain a waterproof and breathable polyurethane fabric.

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