Production process of stain-resistant and waterproof fabric

Abstract

This application relates to the field of fabric production, specifically disclosing a production process for a stain-resistant and waterproof fabric, including the following steps: S1, twisting polyester fibers into warp and weft yarns, with the warp yarn diameter being 40-50 μm and the weft yarn diameter being 25-35 μm, and interweaving the warp and weft yarns to form a base fabric; S2, pressing a pre-made waterproof film onto the base fabric to obtain the waterproof fabric. This application uses warp and weft yarns of different diameters, and through the subtle height difference formed by the interweaving of the warp and weft yarns, micron-level raised textures are formed. After the waterproof film is subsequently pressed, the surface of the waterproof fabric retains the microstructure of the raised texture. When stains adhere to the waterproof fabric, the actual contact area between the stain and the fabric is the tip of the raised point, reducing the adhesion of the stain. Combined with the waterproof effect of the waterproof film, stains on the surface of the waterproof fabric are easily carried away by water flow or wiping force, reducing stain residue on the surface of the waterproof fabric and improving the stain-resistant effect of the waterproof fabric.

Description

Technical Field

[0001] This application relates to the field of fabric production, and more specifically, it relates to a production process for a stain-resistant and waterproof fabric. Background Technology

[0002] Waterproof fabric, as a functional material with liquid barrier properties, is widely used in building waterproofing, outdoor equipment, transportation, and industrial protection. However, with the expansion of application scenarios, the surface of waterproof fabric easily absorbs stains such as oil, dust, and microorganisms during actual use. These stains adhere to the surface of the waterproof fabric, not only clogging the fabric pores and affecting breathability (in the case of breathable waterproof fabric), but also forming hard lumps after drying. These lumps can wear down the waterproof coating during subsequent rolling or unrolling, affecting the waterproof effect of the fabric. Therefore, it is urgent to develop a new waterproof fabric production process that can significantly improve the stain resistance of waterproof fabric while ensuring its waterproof performance. Summary of the Invention

[0003] To improve the anti-fouling ability of waterproof fabric, this application provides a manufacturing process for anti-fouling waterproof fabric.

[0004] The production process for a stain-resistant and waterproof fabric provided in this application adopts the following technical solution:

[0005] A manufacturing process for a stain-resistant and waterproof fabric includes the following steps:

[0006] S1. Polyester fibers are twisted into warp and weft yarns, wherein the warp yarn diameter is 40-50μm and the weft yarn diameter is 25-35μm, and the warp and weft yarns are interwoven to form a base fabric;

[0007] S2. Press the pre-made waterproof film onto the base fabric to obtain the waterproof fabric.

[0008] By adopting the above technical solution, the subtle height difference formed by the interlacing of warp and weft yarns creates a micron-level raised texture. After the waterproof film is subsequently pressed, the surface of the waterproof fabric retains the microstructure of the raised texture. When stains adhere to the waterproof fabric, the actual contact area between the stain and the fabric is the tip of the raised point, which reduces the adhesion of the stain. Combined with the waterproof effect of the waterproof film, stains on the surface of the waterproof fabric are easily carried away by water flow or wiping force, reducing stain residue on the surface of the waterproof fabric and improving the stain-resistant effect of the waterproof fabric.

[0009] Preferably, the waterproof film contains isocyanate-terminated polydimethylsiloxane.

[0010] By adopting the above technical solution, the isocyanate-terminated polydimethylsiloxane has a low surface energy, which can increase the surface contact angle of the waterproof fabric, repel water, oil, dust and other stains, reduce stain adhesion, and make residual stains easy to wipe and rinse. Combined with the base fabric, it forms a synergy of "physical microstructure (protruding texture) + chemical low surface energy", which further improves the anti-fouling effect of the waterproof fabric.

[0011] Preferably, in step S1, the polyester fiber is immersed in a 5% NaOH aqueous solution and stirred at 70-80°C for 30-50 minutes. Then it is rinsed with deionized water until neutral (pH=7), then soaked in a 1% hydrochloric acid solution for 8-10 minutes, then rinsed with deionized water until neutral (pH=7), then dried at 50-60°C, and then twisted into warp and weft yarns.

[0012] By adopting the above technical solution, carboxyl groups are introduced on the surface of polyester fibers. The carboxyl groups can react with the isocyanate groups on the isocyanate-terminated polydimethylsiloxane in the waterproof film to build a stable siloxane chain layer between the waterproof film and the base fabric. This makes the waterproof film less likely to fall off the base fabric after multiple washes, thus improving the durability of the waterproof performance of the waterproof fabric.

[0013] Preferably, the waterproof film contains dibutyltin dilaurate.

[0014] By adopting the above technical solution, dibutyltin dilaurate can catalyze the reaction between the carboxyl groups on the surface of polyester fibers and the isocyanate-terminated polydimethylsiloxane groups in the waterproof film, thereby shortening production time and improving the production efficiency of waterproof fabric.

[0015] Preferably, in step S2, the pre-made waterproof film is pressed onto the base fabric at a pressing temperature of 70-80°C to obtain the waterproof fabric.

[0016] By adopting the above technical solution, high temperature can improve the catalytic efficiency of dibutyltin dilaurate, promote the reaction between the carboxyl groups on the surface of polyester fibers and the isocyanate-terminated polydimethylsiloxane in the waterproof film, further improve the production efficiency of waterproof cloth, and appropriate heating helps to volatilize residual solvents or low-boiling-point components, reducing bubble defects after pressing.

[0017] Preferably, the waterproof film contains polyolefin elastomer powder.

[0018] By adopting the above technical solutions, polyolefin elastomer powder has excellent elasticity and low-temperature toughness, which can reduce the brittleness of the waterproof film, thereby reducing the cracking of the waterproof fabric under folding, stretching or low-temperature conditions, and helping to extend the service life of the waterproof fabric. When pressing at 70-80℃, the polyolefin elastomer powder partially softens because the pressing temperature is close to its softening point, filling the tiny gaps between the waterproof film and the base fabric, enhancing the interfacial bonding force, reducing the risk of delamination. The polyolefin elastomer powder can also alleviate stress concentration at high temperatures, reducing the occurrence of cracks in the waterproof film after pressing.

[0019] Preferably, the waterproof film contains titanium dioxide powder.

[0020] By adopting the above technical solution, when the waterproof fabric is used for outdoor activities, the titanium dioxide powder generates hydroxyl radicals under ultraviolet light, which catalyzes the decomposition of organic stains such as oil on the waterproof film, achieving self-cleaning and enabling the waterproof fabric to meet the anti-fouling needs of different scenarios.

[0021] In summary, this application has the following beneficial effects:

[0022] 1. Because this application uses warp and weft yarns of different diameters, the slight height difference formed by the interlacing of the warp and weft yarns creates a micron-level raised texture. After the waterproof film is subsequently pressed, the surface of the waterproof fabric retains the microstructure of the raised texture. When stains adhere to the waterproof fabric, the actual contact area between the stain and the fabric is the tip of the raised point, which reduces the adhesion of the stain. Combined with the waterproof effect of the waterproof film, the stains on the surface of the waterproof fabric are easily carried away by water flow or wiping force, reducing stain residue on the surface of the waterproof fabric and improving the stain-resistant effect of the waterproof fabric.

[0023] 2. In this application, isocyanate-terminated polydimethylsiloxane is preferably used to increase the contact angle of the waterproof fabric surface, reduce stain adhesion, and make residual stains easy to wipe and rinse. Combined with the base fabric, it forms a synergy of "physical microstructure (protruding texture) + chemical low surface energy", which further improves the anti-fouling effect of the waterproof fabric.

[0024] 3. In this application, polyolefin elastomer powder is preferably used, which can reduce the brittleness of the waterproof film, thereby reducing the possibility of cracking of the waterproof fabric under folding, stretching or low temperature environment, which is conducive to extending the service life of the waterproof fabric. When pressing at 70-80℃, the polyolefin elastomer powder partially softens, fills the tiny gaps between the waterproof film and the base fabric, enhances the interfacial bonding force, and reduces the risk of delamination. The polyolefin elastomer powder can also alleviate stress concentration at high temperature, reducing the occurrence of cracks in the waterproof film after pressing. Detailed Implementation

[0025] The present application will be further described in detail below with reference to the embodiments.

[0026] information Polyolefin elastomer powder Particle size: 5-20μm Titanium dioxide powder Crystal form: anatase; Grain size: ≤2μm antioxidants Antioxidant 1010 and Antioxidant 168 in a 1:1 ratio Leveling agent Polyether modified silicone oil TPU Model: 1154D50

[0027] It should be noted that wt% refers to weight percentage.

[0028] Unless otherwise specified, all raw materials used in the following embodiments are commercially available.

[0029] Example

[0030] Example 1

[0031] This application discloses a manufacturing process for a stain-resistant and waterproof fabric, including the following steps:

[0032] S1. Polyester fibers are twisted into warp and weft yarns, with a warp yarn diameter of 40μm and a weft yarn diameter of 25μm. The warp and weft yarns are interwoven to form a base fabric with a warp and weft density of 20 yarns / cm.

[0033] S2. Press the pre-made waterproof film onto the base fabric at room temperature. The thickness of the waterproof film is 0.12mm, thus obtaining the waterproof fabric.

[0034] In this embodiment, the waterproof film comprises 97.7 wt% TPU, 2 wt% antioxidant, and 0.3 wt% leveling agent.

[0035] Example 2

[0036] S1. Polyester fibers are twisted into warp and weft yarns, with a warp yarn diameter of 50μm and a weft yarn diameter of 35μm. The warp and weft yarns are interwoven to form a base fabric with a warp and weft density of 20 yarns / cm.

[0037] S2. Press the pre-made waterproof film onto the base fabric at room temperature. The thickness of the waterproof film is 0.12mm, thus obtaining the waterproof fabric.

[0038] In this embodiment, the waterproof film comprises 97.7 wt% TPU, 2 wt% antioxidant, and 0.3 wt% leveling agent.

[0039] Example 3

[0040] S1. Polyester fibers are twisted into warp and weft yarns, with a warp yarn diameter of 45μm and a weft yarn diameter of 30μm. The warp and weft yarns are interwoven to form a base fabric with a warp and weft density of 20 yarns / cm.

[0041] S2. Press the pre-made waterproof film onto the base fabric at room temperature. The thickness of the waterproof film is 0.12mm, thus obtaining the waterproof fabric.

[0042] In this embodiment, the waterproof film comprises 97.7 wt% TPU, 2 wt% antioxidant, and 0.3 wt% leveling agent.

[0043] Example 4

[0044] The difference from Example 1 is that the waterproof film comprises 94.7 wt% TPU, 3 wt% isocyanate-terminated polydimethylsiloxane, 2 wt% antioxidant, and 0.3 wt% leveling agent.

[0045] Example 5

[0046] The difference from Example 4 is that in S1, polyester fibers are immersed in a 5% NaOH aqueous solution, stirred at 70°C for 50 minutes, then rinsed with deionized water until neutral (pH=7), then soaked in a 1% hydrochloric acid solution for 8 minutes, then rinsed with deionized water until neutral (pH=7), then dried at 50°C, and then twisted into warp and weft yarns with a warp diameter of 40 μm and a weft diameter of 25 μm. The warp and weft yarns are interwoven to form the base fabric with a warp and weft density of 20 yarns / cm.

[0047] In step S2, the pre-made waterproof membrane is pressed onto the base fabric at a pressing temperature of 70°C. The thickness of the waterproof membrane is 0.12 mm, thus producing the waterproof fabric.

[0048] In this embodiment, the waterproof film comprises 94.65 wt% TPU, 3 wt% isocyanate-terminated polydimethylsiloxane, 2 wt% antioxidant, 0.3 wt% leveling agent, and 0.05 wt% dibutyltin dilaurate.

[0049] Example 6

[0050] The difference from Example 5 is that the waterproof film comprises 88.65 wt% TPU, 6 wt% polyolefin elastomer powder, 3 wt% isocyanate-terminated polydimethylsiloxane, 2 wt% antioxidant, 0.3 wt% leveling agent, and 0.05 wt% dibutyltin dilaurate.

[0051] Example 7

[0052] The difference from Example 1 is that the waterproof film comprises 95.7 wt% TPU, 2 wt% titanium dioxide powder, 2 wt% antioxidant, and 0.3 wt% leveling agent.

[0053] Example 8

[0054] This application discloses a manufacturing process for a stain-resistant and waterproof fabric, including the following steps:

[0055] S1. Immerse polyester fibers in a 5% NaOH aqueous solution and stir at 70°C for 50 min. Then rinse with deionized water until neutral (pH=7). Soak in a 1% hydrochloric acid solution for 8 min and rinse with deionized water until neutral (pH=7). Dry at 50°C. Twist the polyester fibers into warp and weft yarns with a warp diameter of 40 μm and a weft diameter of 25 μm. Interweave the warp and weft yarns to form the base fabric with a warp and weft density of 20 yarns / cm.

[0056] S2. Press the pre-made waterproof film onto the base fabric at room temperature. The pressing temperature is 70℃, and the thickness of the waterproof film is 0.12mm to obtain the waterproof fabric.

[0057] In this embodiment, the waterproof film comprises 86.65 wt% TPU, 6 wt% polyolefin elastomer powder, 3 wt% isocyanate-terminated polydimethylsiloxane, 2 wt% titanium dioxide powder, 2 wt% antioxidant, 0.3 wt% leveling agent, and 0.05 wt% dibutyltin dilaurate.

[0058] Example 9

[0059] This application discloses a manufacturing process for a stain-resistant and waterproof fabric, including the following steps:

[0060] S1. Immerse polyester fibers in a 5% NaOH aqueous solution and stir at 80°C for 30 min. Then rinse with deionized water until neutral (pH=7). Soak in a 1% hydrochloric acid solution for 10 min and rinse with deionized water until neutral (pH=7). Then dry at 60°C. Twist the polyester fibers into warp and weft yarns with a warp diameter of 50 μm and a weft diameter of 35 μm. Interweave the warp and weft yarns to form the base fabric with a warp and weft density of 20 yarns / cm.

[0061] S2. Press the pre-made waterproof film onto the base fabric at room temperature. The pressing temperature is 80℃, and the thickness of the waterproof film is 0.12mm to obtain the waterproof fabric.

[0062] In this embodiment, the waterproof film comprises 86.65 wt% TPU, 6 wt% polyolefin elastomer powder, 3 wt% isocyanate-terminated polydimethylsiloxane, 2 wt% titanium dioxide powder, 2 wt% antioxidant, 0.3 wt% leveling agent, and 0.05 wt% dibutyltin dilaurate.

[0063] Example 10

[0064] This application discloses a manufacturing process for a stain-resistant and waterproof fabric, including the following steps:

[0065] S1. Immerse polyester fibers in a 5% NaOH aqueous solution and stir at 75°C for 40 min. Then rinse with deionized water until neutral (pH=7). Soak in a 1% hydrochloric acid solution for 9 min and rinse with deionized water until neutral (pH=7). Then dry at 55°C. Twist the polyester fibers into warp and weft yarns with a warp diameter of 45 μm and a weft diameter of 30 μm. Interweave the warp and weft yarns to form the base fabric with a warp and weft density of 20 yarns / cm.

[0066] S2. Press the pre-made waterproof film onto the base fabric at room temperature. The pressing temperature is 75℃, and the thickness of the waterproof film is 0.12mm to obtain the waterproof fabric.

[0067] In this embodiment, the waterproof film comprises 86.65 wt% TPU, 6 wt% polyolefin elastomer powder, 3 wt% isocyanate-terminated polydimethylsiloxane, 2 wt% titanium dioxide powder, 2 wt% antioxidant, 0.3 wt% leveling agent, and 0.05 wt% dibutyltin dilaurate.

[0068] Example 11

[0069] The difference from Example 5 is that the isocyanate-terminated polydimethylsiloxane is replaced with polydimethylsiloxane.

[0070] Example 12

[0071] The difference from Example 1 is that the waterproof film comprises 91.7 wt% TPU, 6 wt% polyolefin elastomer powder, 2 wt% antioxidant, and 0.3 wt% leveling agent.

[0072] Comparative Example

[0073] Comparative Example 1

[0074] The difference from Example 1 is that a waterproof fabric made from a base fabric with warp and weft yarns of 25 μm diameter was used as a blank control group.

[0075] Performance testing

[0076] (1) Stain resistance test: The stain resistance of Examples 1-12 and Comparative Example 1 was tested according to the standard GB / T30159.1-2013 "Detection and evaluation of stain resistance of textiles - Part 1: Stain resistance". The liquid staining method was selected. The test samples were prepared, and the samples were placed horizontally with the waterproof film side facing up. Filter paper was placed at the bottom of the sample. Soy sauce was used as the liquid stain. Three drops of soy sauce were dropped on the waterproof film surface of the sample at different locations on each sample, with an interval of more than 50 mm between different locations. Each drop of soy sauce was 0.05 mL. After 30 seconds, the droplets were observed from a 45° direction and rated. The test results are shown in Table 1 below.

[0077] (2) Waterproof film fastness test: Cut rectangular samples with a length of 200 mm and a width of 25 mm from the waterproof fabrics prepared in Examples 1, 4-6 and 11-12 as test specimens. Three parallel test specimens are required for each example. Manually peel off 50 mm from one end of the test specimen (if it is difficult to peel off, the edge can be gently separated with a blade to avoid damaging the base fabric or waterproof film). There should be no obvious damage to the peeled part. Fix the peeled waterproof film end to the clamp on the tensile testing machine and fix the base fabric end to the lower clamp. Ensure that the peel line is consistent with the direction of the tensile force and forms a 180° angle. Start the tensile testing machine at a speed of 100 mm / min. Record the force value during the peeling process and calculate the average value of the three parallel test specimens. The test results are shown in Table 1 below.

[0078] Table 1 Performance Test Results

[0079] antifouling level Peel force / N Example 1 Level 4 10 Example 2 Level 4 / Example 3 Level 4 / Example 4 Level 5 10 Example 5 Level 5 13 Example 6 Level 5 15 Example 7 Level 5 / Example 8 Level 5 / Example 9 Level 5 / Example 10 Level 5 / Example 11 Level 5 10 Example 12 Level 4 10 Comparative Example 1 Level 3 /

[0080] In conclusion, the following conclusions can be drawn:

[0081] 1. As can be seen from Example 1 and Comparative Example 1, and Table 1, using warp and weft yarns of different diameters to weave the base fabric can improve the stain resistance of the waterproof fabric. The reason may be that the slight height difference formed by the interlacing of warp and weft yarns of different diameters creates micron-level raised textures. After the waterproof film is subsequently pressed, the surface of the waterproof fabric retains the microstructure of the raised texture. When stains adhere to the waterproof fabric, the actual contact area between the stain and the fabric is the top of the raised point, which reduces the adhesion of the stain. Combined with the waterproof effect of the waterproof film, the stains on the surface of the waterproof fabric are easily carried away by water flow or wiping force, reducing stain residue on the surface of the waterproof fabric and improving the stain resistance of the waterproof fabric.

[0082] 2. As can be seen from Examples 1 and 4 and Table 1, the addition of isocyanate-terminated polydimethylsiloxane to the waterproof film can improve the antifouling performance of the waterproof fabric. The reason may be that isocyanate-terminated polydimethylsiloxane has low surface energy, which can increase the surface contact angle of the waterproof fabric, repel water, oil, dust and other stains, reduce stain adhesion, and make residual stains easy to wipe and rinse. Combined with the base fabric, it forms a synergy of "physical microstructure (protruding texture) + chemical low surface energy", which further improves the antifouling effect of the waterproof fabric.

[0083] 3. As can be seen from Examples 1, 4-5, and 11 and Table 1, adding isocyanate-terminated polydimethylsiloxane to the waterproof film and introducing carboxyl groups on the polyester fibers can improve the bonding strength between the waterproof film and the base fabric. The reason may be that the carboxyl groups on the surface of the polyester fibers can react with the isocyanate groups on the isocyanate-terminated polydimethylsiloxane in the waterproof film to build a stable siloxane chain layer between the waterproof film and the base fabric, thereby improving the bonding strength between the waterproof film and the base fabric. This makes it less likely for the waterproof film to fall off the base fabric after multiple washes, which is beneficial to improving the durability of the waterproof performance of the waterproof fabric.

[0084] 4. As can be seen from Examples 1, 5-6, and 12 and Table 1, adding polyolefin elastomer powder to the waterproof film and bonding it with high-temperature pressing can improve the bonding strength between the waterproof film and the base fabric. The reason may be that when pressing is carried out at 70-80℃, the polyolefin elastomer powder softens partially because the pressing temperature is close to its softening point, filling the tiny gaps between the waterproof film and the base fabric, enhancing the interfacial bonding force, improving the bonding strength between the waterproof film and the base fabric, and reducing the risk of delamination.

[0085] 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 production process for a stain-resistant and waterproof fabric, characterized in that, Includes the following steps: S1. Immerse polyester fibers in a 5% NaOH aqueous solution and stir at 70-80℃ for 30-50 min. Then rinse with deionized water until neutral pH=7. Soak in 1% hydrochloric acid solution for 8-10 min, rinse with deionized water until neutral pH=7, and then dry at 50-60℃. Twist the polyester fibers into warp and weft yarns. The warp yarn diameter is 40-50μm and the weft yarn diameter is 25-35μm. The warp and weft yarns are interwoven to obtain the base fabric. S2. Press the pre-made waterproof film onto the base fabric at a pressing temperature of 70-80℃ to obtain the waterproof fabric. The waterproof film contains isocyanate-terminated polydimethylsiloxane.

2. The production process of the antifouling and waterproof fabric according to claim 1, characterized in that: The waterproof film contains dibutyltin dilaurate.

3. The production process of the antifouling and waterproof fabric according to claim 1, characterized in that: The waterproof film contains polyolefin elastomer powder.

4. The production process of the antifouling and waterproof fabric according to claim 1, characterized in that: The waterproof film contains titanium dioxide powder.