A water wash resistant abrasion resistant fabric and method of making the same

Abstract

This invention provides a water-resistant and abrasion-resistant fabric and its preparation method, relating to the field of fabric technology. The preparation method of the water-resistant and abrasion-resistant fabric of this invention includes the following steps: (1) Nylon 66 masterbatch is mixed with modified nano-carbon black, modified nano-titanium carbide, hyperbranched polyester dispersant, and antioxidant, and then extruded using a twin-screw extruder to obtain a black masterbatch; (2) The masterbatch obtained in step (1) is melt-spun, cooled, and then stretched to produce a 70 / 48F yarn; (3) The yarn obtained in step (2) is used as the outer yarn and combined with spandex core yarn through a machine-wrapping process to prepare a core-spun yarn, which is then woven to obtain a grey fabric; (4) The grey fabric obtained in step (3) is washed and shaped to obtain a water-resistant and abrasion-resistant fabric. This invention improves the abrasion resistance and waterproof rating of the fabric, maintains long-lasting waterproof performance, improves the fabric's hand feel, and enhances the fabric's wash fastness.

Description

Technical Field

[0001] This invention relates to the field of fabric technology, specifically to a water-resistant and abrasion-resistant fabric and its preparation method. Background Technology

[0002] With the rapid development of the modern textile industry and the continuous improvement of people's living standards, consumers' requirements for fabric performance are becoming increasingly diversified and stringent. Among the many performance requirements, washability and abrasion resistance are particularly crucial. Washability determines whether a fabric can maintain its original color, shape, and functional characteristics after multiple washes, directly affecting its lifespan and aesthetics. Abrasion resistance determines the fabric's resistance to damage from external forces such as friction and scratching, which is essential for applications such as outdoor clothing, sports equipment, and workwear. Therefore, developing a fabric that combines excellent washability and abrasion resistance has become a research hotspot and urgent need in the textile field.

[0003] While existing washable and abrasion-resistant fabrics possess some degree of waterproofing, they often struggle to maintain long-term waterproofing performance after prolonged use and repeated washing. On one hand, some waterproofing agents are prone to detachment during washing, leading to a gradual decrease in waterproofing effectiveness. On the other hand, uneven distribution of nanofillers within the matrix prevents the formation of a dense and stable waterproof structure, allowing moisture to easily penetrate the fabric and affecting its waterproof rating. Furthermore, to enhance abrasion resistance, a certain amount of nanofillers is typically added or special finishing treatments are applied. However, these measures often increase fabric rigidity, resulting in a poorer hand feel, becoming rough and stiff, and reducing wearing comfort. Maintaining both abrasion resistance and softness has become a significant challenge in the development of washable and abrasion-resistant fabrics. Therefore, this invention provides a washable and abrasion-resistant fabric and its preparation method. Summary of the Invention

[0004] The purpose of this invention is to provide a water-resistant and abrasion-resistant fabric and its preparation method, which improves the bonding force between modified carbon black and nylon matrix; improves the dispersibility of carbon black in nylon matrix, avoids agglomeration affecting the fabric feel, and at the same time, synergistically enhances the waterproof and abrasion-resistant properties of the fabric and maintains its long-lasting performance with titanium carbide, while also ensuring the softness of the fabric and improving the color fastness to washing.

[0005] On one hand, the present invention provides a water-resistant and abrasion-resistant fabric, the steps of which include:

[0006] (1) Nylon 66 masterbatch was mixed with modified nano carbon black, modified nano titanium carbide, hyperbranched polyester dispersant and antioxidant, and then extruded by a twin-screw extruder to obtain black masterbatch;

[0007] The modified nano-carbon black is obtained by pretreatment of nano-carbon black with a hyperbranched polyester dispersant; the modified nano-titanium carbide is prepared by surface modification of nano-titanium carbide with a titanate coupling agent.

[0008] (2) The masterbatch obtained in step (1) is melt-spun, cooled, stretched and shaped to make 70 / 48F yarn;

[0009] (3) The yarn obtained in step (2) is used as the outer yarn and the spandex core yarn to prepare core-spun yarn through machine wrapping process, and then the fabric is woven to obtain the greige fabric;

[0010] (4) The fabric obtained in step (3) is washed and shaped to obtain a washable and abrasion resistant fabric.

[0011] Furthermore, the preparation method of the modified nano carbon black includes: dispersing nano carbon black in anhydrous ethanol, adding hyperbranched polyester dispersant, stirring and reacting at 50-70℃ for 1.5-2.5 hours, and obtaining modified nano carbon black after centrifugation, washing and drying.

[0012] Further, the weight ratio of the nano-carbon black, anhydrous ethanol and hyperbranched polyester dispersant is 1:(5–20):(0.05–0.5), preferably 1:(8–12):(0.1–0.3).

[0013] In this invention, the hyperbranched polyester dispersant serves not only as a dispersant during the modification of nano-carbon black but also as a raw material in the preparation of masterbatch. During the pretreatment stage of nano-carbon black, the hyperbranched polyester dispersant, through its numerous terminal functional groups (such as hydroxyl and carboxyl groups) in its molecular structure, forms hydrogen bonds or chemical bonds with the oxygen-containing functional groups on the surface of the nano-carbon black, creating a stable organic coating layer on the carbon black particles. This coating layer effectively prevents the carbon black particles from agglomerating during pretreatment and storage through steric hindrance. Furthermore, in the subsequent melt blending stage of the masterbatch, the hyperbranched molecular chains in the coating layer can physically entangle or chemically interact with the nylon 66 matrix, thereby significantly enhancing the interfacial bonding force between the modified nano-carbon black and the matrix.

[0014] In the preparation of color masterbatch, the additional hyperbranched polyester dispersant plays a dual role: firstly, as a highly efficient processing aid, it further promotes the uniform dispersion of modified nano-carbon black and modified nano-titanium carbide in nylon melt, preventing secondary agglomeration of fillers in shear flow field; secondly, the hyperbranched polyester dispersant itself has good thermal stability (maintaining structural stability at extrusion temperatures of 240-260℃), and its three-dimensional dendritic molecular structure can form a "flexible bridging" layer between the filler and the nylon matrix, effectively buffering interfacial stress and avoiding interfacial debonding between the filler and the matrix due to the difference in thermal expansion coefficients.

[0015] Therefore, the modified nanofiller forms a highly efficient stress transfer network within the nylon matrix: when the fabric is subjected to external forces such as friction, these forces can be uniformly dissipated throughout the matrix through the bridging effect of the evenly dispersed filler and hyperbranched molecules, preventing localized stress concentration that could lead to fiber breakage. Simultaneously, the evenly dispersed filler with good interfacial bonding is less prone to migration and detachment during repeated washing, thus ensuring the long-term stability of the fabric's abrasion resistance, water resistance, and colorfastness. Furthermore, because filler agglomeration is effectively suppressed, preventing the formation of localized rigid areas, the fabric's softness is maintained, solving the technical problem of stiff hand feel in traditional high-filler composite materials.

[0016] Furthermore, the preparation method of the modified nano-titanium carbide includes: dispersing nano-titanium carbide in anhydrous ethanol, adding a titanate coupling agent, stirring and reacting at 40-60℃ for 2-4 hours, and obtaining modified nano-titanium carbide after centrifugation, washing, and drying.

[0017] Furthermore, the weight ratio of the nano-titanium carbide, anhydrous ethanol, and titanate coupling agent is 1:(8–12):(0.1–0.2).

[0018] Further, the titanate coupling agent is at least one of isopropyl tris(dioctyl pyrophosphoryloxy) titanate or isopropyl tris(dioctyl pyrophosphoryloxy) titanate.

[0019] After surface modification treatment, the surface properties of modified nano-carbon black and modified nano-titanium carbide change, significantly enhancing their bonding strength with the nylon matrix. When the fabric is subjected to external forces such as friction, the modified nanofillers, uniformly dispersed in the nylon matrix, can form an effective stress transfer network. In this network, the fillers are tightly bonded to the matrix, and stress can be evenly distributed through this network under external force, preventing localized stress concentration that could lead to fabric damage. Unmodified nanofillers, due to their weak bonding with the matrix, cannot form such an effective stress transfer network and are prone to detaching from the matrix under external force, resulting in decreased fabric abrasion resistance. Therefore, surface modification treatment enables the uniform dispersion of nanofillers and the formation of a stress transfer network, synergistically improving the fabric's abrasion resistance.

[0020] Furthermore, the weight ratio of the nylon 66 masterbatch to the composite modified nanofiller, modified nano titanium carbide, dispersant and antioxidant is (90-94):(5-8):(0.5-1):(2-4):(0.5-0.7).

[0021] Further, in step (1), the mixing conditions are 75-85℃ and 1500-2000rpm for 15-20 minutes; the extrusion temperature of the twin-screw extruder is 240-260℃.

[0022] Further, in step (2), the spinning is carried out in a nitrogen atmosphere, with a spinning temperature of 280-295℃, a spinning speed of 4000-4200m / min, a cooling air temperature of 17-19℃, a wind speed of 0.5-1.0 m / s, and a stretching ratio of 4.0-5.0 times.

[0023] Further, in step (3), the spandex core yarn is 40D spandex yarn, wherein the core yarn tension is 0.15-0.20cN / dtex and the outer yarn tension is 0.25-0.30cN / dtex.

[0024] Furthermore, in step (3), the weaving is carried out using a water jet loom, the weave structure is plain weave, and the warp and weft densities are 130-145 warp threads / inch and 100-115 weft threads / inch.

[0025] Further, in step (4), the water washing is carried out at 75-85℃ for 25-35 minutes; the shaping is carried out at 150-160℃ with a radial overfeed rate of 7-9%.

[0026] On the other hand, the present invention also provides a water-resistant and abrasion-resistant fabric, which is prepared using the aforementioned preparation method.

[0027] The beneficial effects of this invention are as follows:

[0028] 1. In this invention, the modified nano-carbon black is pretreated with a hyperbranched polyester dispersant, which improves its surface properties and allows for better bonding with the nylon matrix. The modified nano-titanium carbide is surface-modified with a titanate coupling agent, similarly enhancing its compatibility with the matrix. Both modified nanofillers coexist in the nylon matrix, forming a complex and dense microstructure on the fabric surface. This structure effectively blocks moisture penetration. Simultaneously, their synergistic effect optimizes the filler distribution within the matrix, resulting in a more uniform and durable waterproof function. Compared to adding only one filler or using unmodified fillers, this significantly improves the fabric's waterproof rating and maintains long-lasting waterproof performance.

[0029] 2. In this invention, the hyperbranched polyester dispersant improves the dispersibility of modified nano-carbon black and modified nano-titanium carbide in a nylon matrix. Good dispersibility allows the fillers to be uniformly distributed in the matrix, preventing filler agglomeration. Filler agglomeration leads to increased localized stiffness in the fabric, affecting its feel. Uniformly dispersed modified nanofillers enhance the fabric's waterproof and abrasion-resistant properties without compromising its feel. The hyperbranched polyester dispersant has a unique molecular structure; its multiple branches can adsorb onto the surface of the nanofillers, forming steric hindrance and preventing the fillers from agglomerating. It also has compatibility with the nylon matrix, promoting good bonding between the fillers and the matrix, thus improving fabric performance while maintaining its softness. Furthermore, good dispersibility and interfacial bonding effectively prevent the migration and shedding of pigments and fillers during washing, improving the fabric's wash fastness. Detailed Implementation

[0030] The technical solution of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] It should also be noted that Nylon 66, grade 3010N, was purchased from Mitsubishi Corporation of Japan.

[0032] Nano carbon black, grade MA-100, purchased from Shanghai Shengqi International Trade Co., Ltd.

[0033] The nano-titanium carbide was purchased from Suzhou Beike Nanotechnology Co., Ltd., with a particle size of 40nm.

[0034] The hyperbranched polyester dispersant, model HyPer C181, was purchased from Hubei Hyperbranched New Material Technology Co., Ltd.

[0035] The standard polyester dispersant, model SUA-300, was purchased from Shiming Technology Co., Ltd.

[0036] The antioxidants used in this invention are N,N'-bis-(3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl)hexanediamine (Irganox 1098) and tris(2,4-di-tert-butylphenyl)phosphite (Irgafos 168) in a weight ratio of 2:1.

[0037] Example 1

[0038] This embodiment provides a method for preparing a water-resistant and abrasion-resistant fabric, specifically including the following steps:

[0039] (1) Preparation of black masterbatch

[0040] By weight, 92 parts of nylon 66 masterbatch, 6.5 parts of modified nano carbon black, 1.5 parts of modified nano titanium carbide, 3 parts of hyperbranched polyester dispersant, and 0.6 parts of antioxidant were taken. The above raw materials were mixed at high speed at 80°C and 1800 rpm for 18 minutes, and then fed into a twin-screw extruder for melt extrusion at 250°C to obtain black masterbatch.

[0041] The modified nano-carbon black is prepared by dispersing 10 parts by weight of nano-carbon black in 100 parts by weight of anhydrous ethanol, adding 2 parts by weight of hyperbranched polyester dispersant, stirring and reacting at 60°C for 2 hours, and obtaining modified nano-carbon black after centrifugation, washing with anhydrous ethanol, and vacuum drying.

[0042] The modified nano-titanium carbide is prepared by dispersing 10 parts by weight of nano-titanium carbide in 100 parts by weight of anhydrous ethanol, adding 1.5 parts by weight of isopropyltris(dioctylpyrophosphoryloxy)titanate, stirring and reacting at 50°C for 3 hours, and obtaining modified nano-titanium carbide after centrifugation, washing with anhydrous ethanol, and vacuum drying.

[0043] (2) Yarn preparation

[0044] The black masterbatch obtained in step (1) was melt-spun. The spinning was controlled in a nitrogen environment with a spinning temperature of 290°C, a spinning speed of 4100 m / min, a cooling air temperature of 18°C, and a wind speed of 0.8 m / s. After cooling and solidification, it was stretched 4.5 times and then shaped by hot rollers at a sizing temperature of 190°C to eliminate the internal stress generated by molecular chain orientation. The yarn thermal shrinkage rate was controlled at 7%, and finally a yarn with a specification of 70D / 48F was produced.

[0045] (3) Weaving of core-spun yarn and grey fabric

[0046] The yarn obtained in step (2) is used as the outer yarn and is combined with 40D spandex core yarn to prepare core-spun yarn through an air-wrapping (machine-wrapping) process, wherein the core yarn tension is controlled at 0.18cN / dtex and the outer yarn tension is controlled at 0.28cN / dtex.

[0047] The obtained core-spun yarn is woven on a water jet loom with a plain weave structure and a warp and weft density of 138 warp threads / inch and 108 weft threads / inch to obtain the greige fabric.

[0048] (4) Post-processing

[0049] The fabric obtained in step (3) is washed at 80°C for 30 minutes to remove surface impurities; then it is set at 155°C with a warp overfeed rate of 8% to obtain the finished washable and abrasion-resistant fabric.

[0050] During this process, the active groups of the hyperbranched polyester dispersant interact with the ends of the nylon 66 molecular chains, anchoring the modified nano-carbon black and modified nano-titanium carbide to the fiber surface and internal pores, forming a stable filler-matrix interface bond, effectively resisting filler loss during washing. The greige fabric after the setting treatment becomes the finished washable and abrasion-resistant fabric.

[0051] Example 2

[0052] This embodiment provides a method for preparing a water-resistant and abrasion-resistant fabric, specifically including the following steps:

[0053] (1) Preparation of black masterbatch

[0054] By weight, 90 parts of nylon 66 masterbatch, 5 parts of modified nano carbon black, 0.5 parts of modified nano titanium carbide, 2 parts of hyperbranched polyester dispersant, and 0.5 parts of antioxidant were mixed at high speed for 15 minutes at 75°C and 1500 rpm, and then fed into a twin-screw extruder for melt extrusion at 240°C to granulate and obtain black masterbatch.

[0055] The modified nano-carbon black is prepared by dispersing 1 part by weight of nano-carbon black in 5 parts by weight of anhydrous ethanol, adding 0.05 parts by weight of hyperbranched polyester dispersant, stirring and reacting at 50°C for 1.5 hours, and obtaining modified nano-carbon black after centrifugation, washing with anhydrous ethanol, and vacuum drying.

[0056] The modified nano-titanium carbide is prepared by dispersing 1 part by weight of nano-titanium carbide in 8 parts by weight of anhydrous ethanol, adding 0.1 parts by weight of isopropyltris(dioctylphosphoyloxy)titanate, stirring and reacting at 40°C for 2 hours, and obtaining modified nano-titanium carbide after centrifugation, washing with anhydrous ethanol, and vacuum drying.

[0057] (2) Yarn preparation

[0058] The black masterbatch obtained in step (1) was melt-spun. The spinning was controlled in a nitrogen environment with a spinning temperature of 280°C, a spinning speed of 4000 m / min, a cooling air temperature of 17°C, and a wind speed of 0.5 m / s. After cooling and solidification, it was stretched 4.0 times and then shaped by hot rollers at a sizing temperature of 190°C to eliminate the internal stress generated by molecular chain orientation. The yarn thermal shrinkage rate was controlled at 7%, and finally a yarn with a specification of 70D / 48F was produced.

[0059] (3) Weaving of core-spun yarn and grey fabric

[0060] The yarn obtained in step (2) is used as the outer yarn and is combined with 40D spandex core yarn to prepare core-spun yarn through an air-wrapping (machine-wrapping) process, wherein the core yarn tension is controlled at 0.15cN / dtex and the outer yarn tension is controlled at 0.25cN / dtex.

[0061] The obtained core-spun yarn was woven on a water jet loom with a plain weave structure and a warp and weft density of 130 warp ends / inch and 100 weft ends / inch to obtain the greige fabric.

[0062] (4) Post-processing

[0063] The fabric obtained in step (3) is washed at 75°C for 25 minutes to remove surface impurities; then it is set at 150°C with a warp overfeed rate of 7% to obtain the finished washable and abrasion-resistant fabric.

[0064] Example 3

[0065] This embodiment provides a method for preparing a water-resistant and abrasion-resistant fabric, specifically including the following steps:

[0066] (1) Preparation of black masterbatch

[0067] By weight, 94 parts of nylon 66 masterbatch, 8 parts of modified nano carbon black, 1 part of modified nano titanium carbide, 4 parts of hyperbranched polyester dispersant, and 0.7 parts of antioxidant were mixed at high speed at 85°C and 2000 rpm for 20 minutes, and then fed into a twin-screw extruder for melt extrusion at 260°C to granulate and obtain black masterbatch.

[0068] The modified nano-carbon black is prepared by dispersing 1 part by weight of nano-carbon black in 20 parts by weight of anhydrous ethanol, adding 0.5 parts by weight of hyperbranched polyester dispersant, stirring and reacting at 70°C for 2.5 hours, and obtaining modified nano-carbon black after centrifugation, washing with anhydrous ethanol, and vacuum drying.

[0069] The modified nano-titanium carbide is prepared by dispersing 1 part by weight of nano-titanium carbide in 12 parts by weight of anhydrous ethanol, adding 0.2 parts by weight of isopropyltris(dioctylpyrophosphoryloxy)titanate, stirring and reacting at 60°C for 4 hours, and obtaining modified nano-titanium carbide after centrifugation, washing with anhydrous ethanol, and vacuum drying.

[0070] (2) Yarn preparation

[0071] The black masterbatch obtained in step (1) was melt-spun. The spinning was controlled in a nitrogen environment with a spinning temperature of 295°C, a spinning speed of 4200 m / min, a cooling air temperature of 19°C, and a wind speed of 1.0 m / s. After cooling and solidification, it was stretched 5.0 times and then shaped by hot rollers at a sizing temperature of 190°C to eliminate the internal stress generated by molecular chain orientation. The yarn heat shrinkage rate was controlled at 7%, and finally a yarn with a specification of 70D / 48F was produced.

[0072] (3) Weaving of core-spun yarn and grey fabric

[0073] The yarn obtained in step (2) is used as the outer yarn and is combined with 40D spandex core yarn to prepare core-spun yarn through an air-wrapping (machine-wrapping) process, wherein the core yarn tension is controlled at 0.20 cN / dtex and the outer yarn tension is controlled at 0.30 cN / dtex.

[0074] The obtained core-spun yarn was woven on a water jet loom with a plain weave structure and a warp and weft density of 145 warp ends / inch and 115 weft ends / inch to obtain the greige fabric.

[0075] (4) Post-processing

[0076] The fabric obtained in step (3) is washed at 85°C for 35 minutes to remove surface impurities; then it is set at 160°C with a warp overfeed rate of 9% to obtain the finished washable and abrasion-resistant fabric.

[0077] Comparative Example 1

[0078] The difference from Example 1 is that no modified nano carbon black is added in step (1). The color masterbatch is prepared only with nylon 66 masterbatch, modified nano titanium carbide, hyperbranched polyester dispersant and antioxidant. The remaining steps are the same as in Example 1.

[0079] Comparative Example 2

[0080] The difference from Example 1 is that: no modified nano-titanium carbide is added in step (1), and only nylon 66 masterbatch, modified nano-carbon black, hyperbranched polyester dispersant and antioxidant are used to prepare color masterbatch, and the remaining steps are the same as in Example 1.

[0081] Comparative Example 3

[0082] The difference from Example 1 is that in step (1), unmodified nano-carbon black is directly used to replace modified nano-carbon black, while the other steps are the same as in Example 1.

[0083] Comparative Example 4

[0084] The difference from Example 1 is that in step (1), unmodified nano-titanium carbide is directly used instead of modified nano-titanium carbide, and the remaining steps are the same as in Example 1.

[0085] Comparative Example 5

[0086] The difference from Example 1 is that no hyperbranched polyester dispersant is added in step (1), and the remaining steps are the same as in Example 1. Specifically, in the preparation of the black masterbatch, by weight, 92 parts of nylon 66 masterbatch, 6.5 parts of modified nano carbon black, 1.5 parts of modified nano titanium carbide, and 0.6 parts of antioxidant are taken. The preparation method of modified nano titanium carbide is the same as in Example 1.

[0087] Comparative Example 6

[0088] The difference from Example 1 is that: in step (1), conventional polyester dispersant is used instead of hyperbranched polyester dispersant, and conventional polyester dispersant is also used for pretreatment in the preparation of modified nano carbon black. The remaining steps are the same as in Example 1.

[0089] Experimental Example 1: The performance of the fabrics prepared in Examples 1-3 and Comparative Examples 1-6 was tested, and the results are shown in Table 1:

[0090] 1. Water wash resistance test

[0091] Referencing AATCC 135-2018, "Dimensional stability of fabrics after household washing," fabric samples (50cm x 50cm) were placed in an automatic washing machine with standard detergent. The water temperature was set to 40℃, and the washing cycle was set to gentle mode. Each wash cycle consisted of a 12-minute main wash, three rinses, and spin drying, completing one standard wash cycle. Water resistance was tested on the samples after 10, 20, and 50 washes. Water resistance was assessed according to AATCC 22-2017, "Water repellency: Spray test." The sample was fixed on the test platform, and 250mL of deionized water was sprayed at a 45° angle from a distance of 20cm. The surface wettability was rated (1-5), with 5 indicating no wettability. Three different locations were tested on each sample, and the average value was taken.

[0092] 2. Wear resistance test

[0093] The test was conducted according to ASTM D4966-12 (2016), "Standard Test Method for Abrasion Resistance of Textiles (Martindale Friction Tester Method)". Three circular specimens with a diameter of 140 mm were randomly cut from the fabric sample and conditioned for 24 hours at a standard atmospheric temperature of 20°C and a relative humidity of 65%. The specimens were installed in the specimen holder of the Martindale abrasion tester, with a friction head mass of 9 kPa, a standard wool felt fabric, and a friction frequency of 47.5 times / min. The surface damage of the specimen was observed every 5000 friction cycles, and the number of friction cycles at which obvious wear or holes appeared on the specimen surface was recorded. The minimum value was taken after each specimen was tested, and the final result was the average of the three specimens.

[0094] 3. Hand feel (softness) test

[0095] The inclined plane cantilever method was used according to ASTM D1388-18, "Standard Test Method for Fabric Stiffness". Five 200mm × 25mm specimens were cut from the fabric sample along both the warp and weft directions and conditioned for 24 hours under standard atmospheric conditions. The specimens were placed on a horizontal platform with one end aligned with the edge of the platform. The specimens were pushed at a constant speed along the platform direction, gradually extending beyond the edge until they sag under their own weight and contact the inclined plane of the platform. The extension length of the specimens was recorded. The bending stiffness (mg·cm) was calculated using the formula. The lower the bending stiffness, the softer the fabric. Five specimens were tested in each direction, and the average value was taken. The final result was the average value of the warp and weft directions.

[0096] 4. Mechanical property testing

[0097] Referring to GB / T 3923.1-2013 "Textiles - Tensile Properties of Fabrics - Part 1: Determination of Breaking Strength and Elongation at Break (Strip Method)", five 50mm wide and 300mm long strips were cut from the fabric sample along both the warp and weft directions. After acclimation to standard atmospheric conditions for 24 hours, the two ends of the strips were flattened and clamped into the pneumatic clamps of a constant rate of elongation (CRE) universal testing machine. The test was started until the strips broke. The machine parameters were set as follows: clamping distance 200mm, pretension 2N, and tensile speed 100mm / min. The instrument automatically recorded the breaking strength (N) and calculated the average value of the results for the five strips in each of the warp and weft directions as the final warp and weft breaking strength of the fabric.

[0098] The test results are shown in Table 1 below:

[0099] Table 1

[0100]

[0101] Based on the foregoing analysis, in terms of water resistance performance, Examples 1-3 maintained a water resistance rating of 4.0 or higher after 50 standard water washes, with Examples 1 and 3 reaching a rating of 4.5, significantly better than all comparative examples. Comparative Example 1 (without modified nano-carbon black) and Comparative Example 2 (without modified nano-titanium carbide) saw their water resistance ratings drop to 2.5 and 3.0 respectively after 50 water washes, indicating that the synergistic effect of the two modified nanofillers is key to maintaining long-term water resistance.

[0102] Comparative Examples 3 and 4, using unmodified nanofillers, only achieved a waterproof rating of 2.0-2.5 after 50 washes, indicating that surface modification is crucial for improving the bonding strength between the filler and the matrix and enhancing water resistance. The water resistance of Comparative Examples 5 (without dispersant) and 6 (using conventional dispersants) was also significantly lower than that of the examples, verifying the unique advantages of hyperbranched polyester dispersants in improving filler dispersion and enhancing interfacial bonding.

[0103] Analysis of abrasion resistance showed that Examples 1-3 all exceeded 100,000 abrasion cycles, with Example 3 reaching 142,000 cycles, demonstrating excellent abrasion resistance. Comparative Examples 1-6, on the other hand, had abrasion cycles between 48,000 and 61,000, only 40%-55% of the examples, indicating that the synergistic reinforcing effect of modified nano-carbon black and modified nano-titanium carbide significantly improved the abrasion resistance of the fabric.

[0104] Comparative Examples 3 and 4 showed the lowest wear resistance (42,000-45,000 cycles) when using unmodified fillers, demonstrating that surface modification allows the nanofillers to be more uniformly dispersed in the nylon matrix, forming an effective stress transfer network, thereby significantly improving wear resistance.

[0105] From the perspective of hand feel (softness), the flexural stiffness of Examples 1-3 ranged from 1760 to 1950 mg·cm, with Example 3 exhibiting the softest hand feel (1760 mg·cm). Comparative Example 5 (without dispersant) had the highest flexural stiffness (2480 mg·cm) and the stiffest hand feel, which was due to the increased fabric stiffness caused by filler agglomeration. The softness of the examples was superior to all comparative examples, indicating that uniformly dispersed modified nanofillers can enhance performance without sacrificing the fabric's hand feel.

[0106] Analysis of breaking strength showed that the warp breaking strength of Examples 1-3 was 460-502 N and the weft breaking strength was 413-445 N, both significantly better than all comparative examples. Example 3 exhibited the highest breaking strength, which is related to its higher content of modified nanofiller and higher spinning draw ratio, indicating improved fiber orientation and crystallinity, effectively enhancing the matrix strength. The breaking strength of Comparative Examples 1 and 2 was lower than that of Example 1, indicating that the two modified nanofillers have a certain synergistic reinforcing effect, and their combined use can more effectively improve the mechanical properties of the fabric. Comparative Examples 3 and 4 used unmodified nanofillers, resulting in a further decrease in breaking strength, indicating that surface modification treatment plays a role in improving the uniformity of filler dispersion in the nylon 66 matrix, enhancing the filler-matrix interface bonding force, and avoiding stress concentration points. Comparative Example 5 had the lowest breaking strength, and the breaking strength of Comparative Example 6 was also significantly lower than that of Example 1. This verifies that hyperbranched polyester dispersants, with their multi-branched structure and abundant active functional groups, can more effectively anchor nanofillers, promote their uniform dispersion, and enhance their interfacial bonding with nylon 66, thus possessing unique advantages in improving tensile strength.

[0107] Finally, it should be noted that the above embodiments are only used to illustrate the present invention and are not intended to limit the technical solutions described in the present invention; those skilled in the art should understand that modifications or equivalent substitutions can still be made to the present invention; and all technical solutions and improvements that do not depart from the spirit and scope of the present invention should be covered within the scope of the claims of the present invention.

Claims

1. A method for preparing a water-resistant and abrasion-resistant fabric, characterized in that the steps include... include: (1) Nylon 66 masterbatch was mixed with modified nano carbon black, modified nano titanium carbide, hyperbranched polyester dispersant and antioxidant, and then extruded by a twin-screw extruder to obtain black masterbatch; The modified nano-carbon black is obtained by pretreatment of nano-carbon black with a hyperbranched polyester dispersant; the modified nano-titanium carbide is prepared by surface modification of nano-titanium carbide with a titanate coupling agent. (2) The masterbatch obtained in step (1) is melt-spun, cooled, stretched and shaped to make 70 / 48F yarn; (3) The yarn obtained in step (2) is used as the outer yarn and the spandex core yarn to prepare core-spun yarn through machine wrapping process, and then the fabric is woven to obtain the greige fabric; (4) The fabric obtained in step (3) is washed and shaped to obtain a washable and abrasion resistant fabric.

2. The method for preparing a water-resistant and abrasion-resistant fabric according to claim 1, characterized in that, The method for preparing the modified nano carbon black includes: dispersing nano carbon black in anhydrous ethanol, adding hyperbranched polyester dispersant, stirring and reacting at 50-70℃ for 1.5-2.5 hours, and obtaining the modified nano carbon black after centrifugation, washing and drying.

3. The method for preparing a water-resistant and abrasion-resistant fabric according to claim 1, characterized in that, The method for preparing the modified nano-titanium carbide includes: dispersing nano-titanium carbide in anhydrous ethanol, adding a titanate coupling agent, stirring and reacting at 40-60℃ for 2-4 hours, and obtaining modified nano-titanium carbide after centrifugation, washing, and drying.

4. The method for preparing a water-resistant and abrasion-resistant fabric according to claim 1, characterized in that, In step (1), the weight ratio of the nylon 66 masterbatch to the composite modified nanofiller, modified nano titanium carbide, dispersant and antioxidant is (90-94): (5-8): (0.5-1): (2-4): (0.5-0.7).

5. The method for preparing a water-resistant and abrasion-resistant fabric according to claim 1, characterized in that, In step (1), the mixing conditions are 75-85℃ and 1500-2000rpm for 15-20 minutes; the extrusion temperature of the twin-screw extruder is 240-260℃.

6. The method for preparing a water-resistant and abrasion-resistant fabric according to claim 1, characterized in that, In step (2), the spinning is carried out in a nitrogen atmosphere, with a spinning temperature of 280-295℃, a spinning speed of 4000-4200m / min, a cooling air temperature of 17-19℃, a wind speed of 0.5-1.0 m / s, and a stretching ratio of 4.0-5.0 times.

7. The method for preparing a water-resistant and abrasion-resistant fabric according to claim 1, characterized in that, In step (3), the spandex core yarn is 40D spandex yarn, wherein the core yarn tension is 0.15-0.20cN / dtex and the outer yarn tension is 0.25-0.30cN / dtex.

8. The method for preparing a water-resistant and abrasion-resistant fabric according to claim 1, characterized in that, In step (3), the weaving is done using a water jet loom with a plain weave structure and a warp and weft density of 130-145 warp ends / inch and 100-115 weft ends / inch.

9. The method for preparing a water-resistant and abrasion-resistant fabric according to claim 1, characterized in that, In step (4), the water washing is carried out at 75-85℃ for 25-35 minutes; the shaping is carried out at 150-160℃ with a radial overfeed rate of 7-9%.

10. A water-resistant and abrasion-resistant fabric, characterized in that, It is prepared using the preparation method according to any one of claims 1-9.

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