Production process of durable waterproof fabric

Abstract

This application relates to the field of waterproof fabric, specifically disclosing a production process for durable waterproof fabric, including the following steps: preparing a chitosan solution, brushing the chitosan solution onto one side of a polyester base fabric and drying it, then placing a TPU waterproof film on the side of the polyester base fabric brushed with the chitosan solution, pressing the TPU waterproof film onto the polyester base fabric at a pressing temperature of 80-90℃, and then cooling to room temperature to obtain the waterproof fabric. At the pressing temperature of 80-90℃, chitosan can form hydrogen bonds with the ester groups on the polyester base fabric, and simultaneously form intermolecular forces with the polar groups on the surface of the TPU waterproof film, enhancing the interfacial bonding force between the polyester base fabric and the TPU waterproof film, inhibiting film peeling. Furthermore, chitosan's weak absorption of ultraviolet light can delay film aging, and its inherent antibacterial properties can inhibit mold growth on the waterproof fabric, thus extending its service life and comprehensively improving its durability.

Description

Technical Field

[0001] This application relates to the field of waterproof fabrics, and more specifically, it relates to a manufacturing process for a durable waterproof fabric. Background Technology

[0002] Waterproof fabric, as a functional material that can block liquid water, has been deeply integrated into diverse fields such as construction, transportation, agriculture, industry, and outdoor consumption.

[0003] In related technologies, waterproof fabrics are mostly made using a simple lamination process. However, when waterproof fabrics are used, they are exposed to sun and rain for a long time, and the membrane layer is prone to peeling off, which shortens the overall service life and needs to be improved. Summary of the Invention

[0004] To address the issue of waterproof fabrics experiencing membrane peeling and shortened lifespan due to prolonged exposure to sunlight and rain, this application provides a manufacturing process for durable waterproof fabrics.

[0005] The manufacturing process for a durable waterproof fabric provided in this application adopts the following technical solution:

[0006] A manufacturing process for a durable waterproof fabric includes the following steps: chitosan and a 1wt% dilute acetic acid solution are stirred at 40-50℃ for 20-30 minutes to obtain a 2wt% chitosan solution; the chitosan solution is brushed onto one side of a polyester base fabric; the fabric is dried at 50-60℃ for 10-15 minutes; a pre-made TPU waterproof film is placed on the side of the polyester base fabric brushed with the chitosan solution; the TPU waterproof film is pressed onto the polyester base fabric at a pressing temperature of 80-90℃; and then cooled to room temperature to obtain the waterproof fabric.

[0007] By adopting the above technical solution, the chitosan molecular chain contains a large number of amino and hydroxyl groups. At a pressing temperature of 80-90℃, it can form hydrogen bonds with the ester groups on the polyester base fabric and form intermolecular forces with the polar groups on the surface of the TPU waterproof film. This enhances the interfacial bonding force between the polyester base fabric and the TPU waterproof film, inhibiting film peeling. On the other hand, chitosan's weak absorption of ultraviolet rays can reduce the direct exposure of ultraviolet rays to the TPU waterproof film, delaying film aging. Its inherent antibacterial properties can also inhibit the mildew growth of the waterproof fabric, which is beneficial to extending the service life of the waterproof fabric and comprehensively improving its durability.

[0008] Preferably, the TPU waterproof film contains 2-hydroxy-4-octoxybenzophenone.

[0009] By adopting the above technical solution, the phenolic hydroxyl group in the 2-hydroxy-4-octoxybenzophenone molecule can absorb medium-wave ultraviolet rays, while chitosan has a weak absorption capacity for long-wave ultraviolet rays. The two form a complementary absorption system in the wavelength range, which can more comprehensively reduce the damage of ultraviolet rays to TPU waterproof film and further delay film aging. At the same time, the phenolic hydroxyl group of 2-hydroxy-4-octoxybenzophenone can form hydrogen bonds with the amino group of chitosan, enhancing the adhesion of 2-hydroxy-4-octoxybenzophenone on TPU waterproof film, reducing the volatilization and loss of 2-hydroxy-4-octoxybenzophenone, and improving the durability of the waterproof fabric's anti-ultraviolet effect.

[0010] Preferably, before brushing the chitosan solution onto the surface of the polyester base fabric, a crosslinking agent is added to the chitosan solution, stirred and mixed, and then allowed to stand for 5-6 minutes. The mass ratio of the crosslinking agent to chitosan is 1:50.

[0011] By adopting the above technical solution, the crosslinking agent can cause chitosan to undergo a crosslinking reaction with the phenolic hydroxyl groups of 2-hydroxy-4-octyloxybenzophenone in the TPU waterproof film, forming covalent bonds, improving interfacial bonding, and further inhibiting film peeling.

[0012] Preferably, after adding a cross-linking agent to the chitosan solution, stirring and mixing, and letting it stand for 5-6 minutes, the pH is adjusted to 5 with NaOH solution.

[0013] By adopting the above technical solution, 2-hydroxy-4-octyloxybenzophenone is more stable in a weakly acidic environment, and chitosan has a more moderate viscosity at this pH value, resulting in a more uniform film formation after brushing, which can better adhere to the surface of polyester base fabric and reduce interfacial bubbles.

[0014] Preferably, before placing the TPU waterproof film, the polyester base fabric coated with chitosan solution and dried is preheated at 50-60℃ for 5-8 minutes. Then, the pre-made TPU waterproof film is placed on the side of the polyester base fabric coated with chitosan solution. The TPU waterproof film and the polyester base fabric are then placed into a hot press laminating machine. The gradient pressure mode of the hot press laminating machine is started, and the first stage pressure is set to 0.2MPa and the time is 5s, the second stage pressure is set to 0.4MPa and the time is 10s, and the third stage pressure is set to 0.2MPa and the time is 5s. The TPU waterproof film is then pressed onto the polyester base fabric at a pressing temperature of 80-90℃.

[0015] By adopting the above technical solution, preheating can open the active sites of chitosan molecular chains, making it easier for chitosan to combine with the phenolic hydroxyl groups on 2-hydroxy-4-octyloxybenzophenone in the TPU waterproof film. Gradient pressure first removes interfacial air through low pressure, then promotes interfacial cross-linking with high pressure, and finally fixes the shape with low pressure. This reduces the damage to the base fabric fibers caused by direct high-pressure pressing, making the interfacial bonding denser and helping to inhibit film peeling.

[0016] Preferably, after pressing, the product is cured at 40°C for 24 hours and then cooled to room temperature.

[0017] By adopting the above technical solution, constant temperature curing can make the cross-linking reaction between chitosan and 2-hydroxy-4-octyloxybenzophenone in the TPU waterproof film more complete, further improve the interfacial bonding force, and reduce the interfacial stress caused by sudden temperature changes, thus avoiding cracking due to stress release during later use.

[0018] In summary, this application has the following beneficial effects:

[0019] 1. Since this application uses a chitosan solution brushed onto a polyester base fabric and then hot-pressed with a TPU waterproof film, the chitosan can form hydrogen bonds with the ester groups on the polyester base fabric at a pressing temperature of 80-90℃, and at the same time form intermolecular forces with the polar groups on the surface of the TPU waterproof film, thereby improving the interfacial bonding force between the polyester base fabric and the TPU waterproof film and inhibiting film peeling. On the other hand, the weak absorption capacity of chitosan to ultraviolet rays can delay the aging of the film, and its inherent antibacterial properties can also inhibit the mildew of the waterproof fabric, which is conducive to extending the service life of the waterproof fabric and comprehensively improving the durability of the waterproof fabric.

[0020] 2. In this application, 2-hydroxy-4-octoxybenzophenone is preferably used. The 2-hydroxy-4-octoxybenzophenone and chitosan form a band-complementary absorption system, which can more comprehensively reduce the damage of ultraviolet rays to the TPU waterproof film and further delay the aging of the film. At the same time, the phenolic hydroxyl groups of 2-hydroxy-4-octoxybenzophenone can form hydrogen bonds with the amino groups of chitosan, reducing the volatilization and loss of 2-hydroxy-4-octoxybenzophenone and improving the durability of the waterproof fabric's anti-ultraviolet effect.

[0021] 3. The process of this application opens the active sites of chitosan molecular chains by preheating, making it easier for chitosan to combine with the phenolic hydroxyl groups on 2-hydroxy-4-octyloxybenzophenone in the TPU waterproof film. Gradient pressure first removes interfacial air through low pressure, then promotes interfacial cross-linking with high pressure, and finally fixes with low pressure. This reduces the damage to the base fabric fibers caused by direct high-pressure pressing, making the interfacial bonding denser and helping to inhibit film peeling. Detailed Implementation

[0022] The present application will be further described in detail below with reference to the embodiments.

[0023] information Chitosan Deacetylation degree ≥85%, molecular weight: 100-300kDa Crosslinking agent glutaraldehyde antioxidants Antioxidant 1010 and Antioxidant 168 in a 1:1 ratio Leveling agent polydimethylsiloxane

[0024] It should be noted that wt% refers to weight percentage.

[0025] Unless otherwise specified, all raw materials used in the following embodiments are commercially available.

[0026] Example 1

[0027] This application discloses a manufacturing process for a durable waterproof fabric, including the following steps:

[0028] Chitosan and 1 wt% dilute acetic acid solution were stirred at 40°C for 30 min to obtain a 2 wt% chitosan solution. The chitosan solution was brushed onto one side of the polyester base fabric and dried at 50°C for 15 min. Then, the pre-made TPU waterproof film was placed on the side of the polyester base fabric brushed with chitosan solution. The TPU waterproof film was pressed onto the polyester base fabric at a pressing temperature of 80°C and then cooled to room temperature to obtain the waterproof fabric.

[0029] In this embodiment, the polyester base fabric has a thickness of 0.3 mm, and the TPU waterproof film comprises 97.7 wt% TPU, 2 wt% antioxidant, and 0.3 wt% leveling agent, with a thickness of 0.12 mm.

[0030] Example 2

[0031] Chitosan and 1wt% dilute acetic acid solution were stirred at 50℃ for 20 minutes to obtain a 2wt% chitosan solution. The chitosan solution was brushed onto one side of the polyester base fabric and dried at 60℃ for 10 minutes. Then, the pre-made TPU waterproof film was placed on the side of the polyester base fabric brushed with chitosan solution. The TPU waterproof film was pressed onto the polyester base fabric at a pressing temperature of 90℃ and then cooled to room temperature to obtain the waterproof fabric.

[0032] In this embodiment, the polyester base fabric has a thickness of 0.3 mm, and the TPU waterproof film comprises 97.7 wt% TPU, 2 wt% antioxidant, and 0.3 wt% leveling agent, with a thickness of 0.12 mm.

[0033] Example 3

[0034] Chitosan and 1 wt% dilute acetic acid solution were stirred at 45°C for 25 min to obtain a 2 wt% chitosan solution. The chitosan solution was brushed onto one side of the polyester base fabric and dried at 55°C for 13 min. Then, the pre-made TPU waterproof film was placed on the side of the polyester base fabric brushed with chitosan solution. The TPU waterproof film was pressed onto the polyester base fabric at a pressing temperature of 85°C and then cooled to room temperature to obtain the waterproof fabric.

[0035] In this embodiment, the polyester base fabric has a thickness of 0.3 mm, and the TPU waterproof film comprises 97.7 wt% TPU, 2 wt% antioxidant, and 0.3 wt% leveling agent, with a thickness of 0.12 mm.

[0036] Example 4

[0037] The difference from Example 1 is that the TPU waterproof film comprises 96.2 wt% TPU, 1.5 wt% 2-hydroxy-4-octyloxybenzophenone, 2 wt% antioxidant, and 0.3 wt% leveling agent.

[0038] Example 5

[0039] The difference from Example 4 is that the production process of the waterproof fabric includes the following steps:

[0040] Chitosan and 1 wt% dilute acetic acid solution were stirred at 40℃ for 30 min to obtain a 2 wt% chitosan solution. A crosslinking agent was added to the chitosan solution and stirred until well mixed. The mixture was then allowed to stand for 5 min. The mass ratio of crosslinking agent to chitosan was 1:50. The pH was then adjusted to 5 with 0.1 mol / L NaOH solution. The chitosan solution was brushed onto one side of the polyester base fabric and dried at 50℃ for 15 min. The pre-made TPU waterproof film was then placed on the side of the polyester base fabric brushed with chitosan solution. The TPU waterproof film was then pressed onto the polyester base fabric at a pressing temperature of 80℃. The mixture was then cooled to room temperature to obtain the waterproof fabric.

[0041] Example 6

[0042] The difference from Example 5 is that the production process of the waterproof fabric includes the following steps:

[0043] Chitosan and 1 wt% dilute acetic acid solution were stirred at 40℃ for 30 min to obtain a 2 wt% chitosan solution. Crosslinking agent was added to the chitosan solution and stirred until well mixed. The solution was then allowed to stand for 5 min. The mass ratio of crosslinking agent to chitosan was 1:50. The pH was then adjusted to 5 with 0.1 mol / L NaOH solution.

[0044] A chitosan solution is brushed onto one side of a polyester base fabric and dried at 50°C for 15 minutes. The dried polyester base fabric is then preheated at 50°C for 8 minutes. A pre-made TPU waterproof film is then placed on the side of the polyester base fabric brushed with chitosan solution. The TPU waterproof film, along with the polyester base fabric, is then placed into a hot press laminating machine. The gradient pressure mode of the hot press laminating machine is activated, with the first stage pressure set to 0.2 MPa and the time to 5 seconds, the second stage pressure set to 0.4 MPa and the time to 10 seconds, and the third stage pressure set to 0.2 MPa and the time to 5 seconds. The TPU waterproof film is then pressed onto the polyester base fabric at a pressing temperature of 80°C. The fabric is then cooled to room temperature to obtain the waterproof fabric.

[0045] Example 7

[0046] The difference from Example 6 is that the production process of the waterproof fabric includes the following steps:

[0047] Chitosan and 1 wt% dilute acetic acid solution were stirred at 40℃ for 30 min to obtain a 2 wt% chitosan solution. Crosslinking agent was added to the chitosan solution and stirred until well mixed. The solution was then allowed to stand for 5 min. The mass ratio of crosslinking agent to chitosan was 1:50. The pH was then adjusted to 5 with 0.1 mol / L NaOH solution.

[0048] A chitosan solution was brushed onto one side of a polyester base fabric and dried at 50°C for 15 minutes. The dried polyester base fabric was then preheated at 50°C for 8 minutes. A pre-made TPU waterproof film was then placed on the side of the polyester base fabric brushed with chitosan solution. The TPU waterproof film and the polyester base fabric were then placed into a hot press laminating machine. The gradient pressure mode of the hot press laminating machine was started. The first stage pressure was set to 0.2 MPa and the time to 5 seconds, the second stage pressure was set to 0.4 MPa and the time to 10 seconds, and the third stage pressure was set to 0.2 MPa and the time to 5 seconds. The TPU waterproof film was then pressed onto the polyester base fabric at a pressing temperature of 80°C. After pressing, the fabric was cured at 40°C for 24 hours and then cooled to room temperature to obtain the waterproof fabric.

[0049] Example 8

[0050] This application discloses a manufacturing process for a durable waterproof fabric, including the following steps:

[0051] Chitosan and 1 wt% dilute acetic acid solution were stirred at 50°C for 20 min to obtain a 2 wt% chitosan solution. A cross-linking agent was added to the chitosan solution and stirred until well mixed. The solution was then allowed to stand for 6 min. The mass ratio of cross-linking agent to chitosan was 1:50. The pH was then adjusted to 5 with 0.1 mol / L NaOH solution.

[0052] A chitosan solution was brushed onto one side of a polyester base fabric and dried at 60°C for 10 minutes. The dried polyester base fabric was then preheated at 60°C for 5 minutes. A pre-made TPU waterproof film was then placed on the side of the polyester base fabric brushed with chitosan solution. The TPU waterproof film and the polyester base fabric were then placed into a hot press laminating machine. The gradient pressure mode of the hot press laminating machine was started. The first stage pressure was set to 0.2 MPa and the time to 5 seconds, the second stage pressure was set to 0.4 MPa and the time to 10 seconds, and the third stage pressure was set to 0.2 MPa and the time to 5 seconds. The TPU waterproof film was then pressed onto the polyester base fabric at a pressing temperature of 90°C. After pressing, the fabric was cured at 40°C for 24 hours and then cooled to room temperature to obtain the waterproof fabric.

[0053] In this embodiment, the polyester base fabric has a thickness of 0.3 mm, and the TPU waterproof film comprises 96.2 wt% TPU, 1.5 wt% 2-hydroxy-4-octyloxybenzophenone, 2 wt% antioxidant, and 0.3 wt% leveling agent. The thickness of the TPU waterproof film is 0.12 mm.

[0054] Example 9

[0055] This application discloses a manufacturing process for a durable waterproof fabric, including the following steps:

[0056] Chitosan and 1 wt% dilute acetic acid solution were stirred at 45℃ for 25 min to obtain a 2 wt% chitosan solution. Crosslinking agent was added to the chitosan solution and stirred until well mixed. The solution was then allowed to stand for 6 min. The mass ratio of crosslinking agent to chitosan was 1:50. The pH was then adjusted to 5 with 0.1 mol / L NaOH solution.

[0057] A chitosan solution was brushed onto one side of a polyester base fabric and dried at 55°C for 13 minutes. The dried polyester base fabric was then preheated at 55°C for 7 minutes. A pre-made TPU waterproof film was then placed on the side of the polyester base fabric brushed with chitosan solution. The TPU waterproof film and the polyester base fabric were then placed into a hot press laminating machine. The gradient pressure mode of the hot press laminating machine was started. The first stage pressure was set to 0.2 MPa and the time to 5 seconds, the second stage pressure was set to 0.4 MPa and the time to 10 seconds, and the third stage pressure was set to 0.2 MPa and the time to 5 seconds. The TPU waterproof film was then pressed onto the polyester base fabric at a pressing temperature of 85°C. After pressing, the fabric was cured at 40°C for 24 hours and then cooled to room temperature to obtain the waterproof fabric.

[0058] In this embodiment, the polyester base fabric has a thickness of 0.3 mm, and the TPU waterproof film comprises 96.2 wt% TPU, 1.5 wt% 2-hydroxy-4-octyloxybenzophenone, 2 wt% antioxidant, and 0.3 wt% leveling agent. The thickness of the TPU waterproof film is 0.12 mm.

[0059] Example 10

[0060] The difference from Example 4 is that 2-hydroxy-4-octoxybenzophenone is replaced with 4-methylbenzophenone.

[0061] Comparative Example 1

[0062] The difference from Example 1 is that a waterproof fabric produced by laminating a TPU waterproof film onto a polyester base fabric was used as a blank control group. The thickness of the polyester base fabric was 0.3 mm, and the components of the TPU waterproof film included 97.7 wt% TPU, 2 wt% antioxidant, and 0.3 wt% leveling agent. The thickness of the TPU waterproof film was 0.12 mm.

[0063] Performance testing

[0064] (1) Interface peel strength test: 100mm×25mm samples were cut from the waterproof fabrics prepared in Examples 1-10 and Comparative Example 1. At least 5 parallel samples were prepared for each example or comparative example. The TPU waterproof film and the polyester base fabric were peeled apart by 20mm at one end and fixed on the upper and lower clamps of the tensile testing machine. The tensile speed was set to 100mm / min. The machine was started to peel at 180°. The average force value during the peeling process was recorded. The test results are shown in Table 1 below.

[0065] (2) UV protection effect test: Examples 1, 4, 10 and Comparative Example 1 were tested according to the standard GB / T 18830-2009 "Evaluation of UV protection performance of textiles". The test was conducted at 23℃ and 50%RH. The light source was a xenon arc lamp and the scanning band was 290-400nm. The UPF value was calculated and the test results are shown in Table 1 below.

[0066] (3) Durability test of UV resistance: The exposure test of Examples 4 and 10 was carried out in accordance with the standard GB / T 16422.3-2014 "Exposure test method for laboratory light sources of plastics - Part 3: Fluorescent ultraviolet lamps". The test cycle was as follows: the UVA-340 lamp tube was irradiated at 60°C for 8 hours, followed by condensation at 50°C for 4 hours. After the samples were aged for a total of 200 hours, they were taken out and tested according to the above UV resistance test conditions. The UPF value was calculated and the test results are shown in Table 1 below.

[0067] Table 1 Performance Test Results

[0068] Interface peel strength / N UV protection effect (UPF value) Duration of UV protection effect (UPF value after aging) UPF value decrease rate Example 1 11.3 15 - - Example 2 11.5 - - - Example 3 11.4 - - - Example 4 12.0 50 45 10% Example 5 13.0 - - - Example 6 13.8 - - - Example 7 14.5 - - - Example 8 14.8 - - Example 9 14.6 - - - Example 10 11.4 40 30 25% Comparative Example 1 7.5 10 - -

[0069] (The "-" in the table indicates that no experiment was conducted and no data was available.)

[0070] In conclusion, the following conclusions can be drawn:

[0071] 1. As can be seen from Example 1 and Comparative Example 1, and Table 1, brushing chitosan solution onto polyester base fabric and then hot-pressing a TPU waterproof film can improve the durability of the waterproof fabric. The reason may be that: at a pressing temperature of 80-90℃, chitosan can form hydrogen bonds with the ester groups on the polyester base fabric, and at the same time form intermolecular forces with the polar groups on the surface of the TPU waterproof film, thereby enhancing the interfacial bonding force between the polyester base fabric and the TPU waterproof film and inhibiting film peeling. On the other hand, the weak absorption capacity of chitosan to ultraviolet light can delay film aging, which is beneficial to extending the service life of the waterproof fabric and comprehensively improving the durability of the waterproof fabric.

[0072] 2. As can be seen from Examples 1, 4, and 10, and Table 1, the addition of 2-hydroxy-4-octoxybenzophenone to the TPU waterproof film can improve the UV resistance and durability of the waterproof fabric. The reason may be that the 2-hydroxy-4-octoxybenzophenone molecule contains phenolic hydroxyl groups, which can absorb medium-wave ultraviolet rays, while chitosan has a weak absorption capacity for long-wave ultraviolet rays. The two form a complementary absorption system, which can more comprehensively reduce the damage of ultraviolet rays to the TPU waterproof film and further delay the aging of the film. At the same time, the phenolic hydroxyl groups of 2-hydroxy-4-octoxybenzophenone can form hydrogen bonds with the amino groups of chitosan, enhancing the adhesion of 2-hydroxy-4-octoxybenzophenone on the TPU waterproof film, reducing the volatilization and loss of 2-hydroxy-4-octoxybenzophenone, and improving the durability of the UV resistance of the waterproof fabric.

[0073] 3. Based on Examples 1, 4, and 5 and Table 1, it can be seen that adding a crosslinking agent to the chitosan solution can improve the interfacial bonding between the TPU waterproof film and the polyester base fabric on the waterproof cloth. The reason may be that the crosslinking agent can cause the chitosan to undergo a crosslinking reaction with the phenolic hydroxyl groups of 2-hydroxy-4-octyloxybenzophenone in the TPU waterproof film, forming covalent bonds and improving the interfacial bonding.

[0074] 3. As can be seen from Examples 1, 4, and 6 and Table 1, the preheating and gradient hot pressing process can improve the interfacial bonding between the TPU waterproof film and the polyester base fabric on the waterproof fabric. The reason may be that preheating can open the active sites of chitosan molecular chains, making it easier for chitosan to combine with the phenolic hydroxyl groups on 2-hydroxy-4-octyloxybenzophenone in the TPU waterproof film. Gradient pressure first removes interfacial air through low pressure, then promotes interfacial cross-linking with high pressure, and finally sets the shape with low pressure. This reduces the damage to the base fabric fibers caused by direct high-pressure pressing, making the interfacial bonding denser and helping to inhibit film peeling.

[0075] 4. As can be seen from Examples 1, 6, and 7 and Table 1, the preheating and gradient hot pressing process combined with constant temperature curing can further improve the interfacial bonding between the TPU waterproof film and the polyester base fabric on the waterproof cloth. The reason may be that constant temperature curing allows the cross-linking reaction between chitosan and 2-hydroxy-4-octyloxybenzophenone in the TPU waterproof film to be more complete, further improving the interfacial bonding and reducing the interfacial stress caused by sudden temperature changes, thus avoiding cracking due to stress release during later use.

[0076] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A manufacturing process for a durable waterproof fabric, characterized in that, Includes the following steps: Chitosan and 1wt% dilute acetic acid solution are stirred at 40-50℃ for 20-30 minutes to obtain a 2wt% chitosan solution. The chitosan solution is brushed onto one side of a polyester base fabric and dried at 50-60℃ for 10-15 minutes. Then, a pre-made TPU waterproof film is placed on the side of the polyester base fabric brushed with chitosan solution. The TPU waterproof film is pressed onto the polyester base fabric at a pressing temperature of 80-90℃. After cooling to room temperature, the waterproof fabric is obtained.

2. The manufacturing process of the durable waterproof fabric according to claim 1, characterized in that: The TPU waterproof film contains 2-hydroxy-4-octoxybenzophenone.

3. The manufacturing process of the durable waterproof fabric according to claim 2, characterized in that: Before brushing the chitosan solution onto the surface of the polyester base fabric, add a crosslinking agent to the chitosan solution, stir and mix well, and let it stand for 5-6 minutes. The mass ratio of crosslinking agent to chitosan is 1:

50.

4. The manufacturing process of the durable waterproof fabric according to claim 3, characterized in that: Add a cross-linking agent to the chitosan solution, stir to mix well, and let stand for 5-6 minutes. Then adjust the pH to 5 with NaOH solution.

5. The manufacturing process of the durable waterproof fabric according to claim 4, characterized in that: Before placing the TPU waterproof film, preheat the dried polyester base fabric coated with chitosan solution at 50-60℃ for 5-8 minutes. Then, place the pre-made TPU waterproof film on the side of the polyester base fabric coated with chitosan solution. Place the TPU waterproof film and the polyester base fabric together into a hot press laminating machine. Start the gradient pressure mode of the hot press laminating machine, set the first stage pressure to 0.2MPa and the time to 5s, the second stage pressure to 0.4MPa and the time to 10s, and the third stage pressure to 0.2MPa and the time to 5s. Press the TPU waterproof film onto the polyester base fabric at a pressing temperature of 80-90℃.

6. The manufacturing process of the durable waterproof fabric according to claim 5, characterized in that: After pressing, it is cured at 40℃ for 24 hours, and then cooled to room temperature.