High-strength spun yarn fabric and method of making same

Abstract

The application discloses high-strength cotton yarn fabric and a preparation method thereof, and relates to the technical field of cotton yarn fabric preparation, which comprises the following component raw materials: modified nylon 66 filaments, reinforcing fibers and spandex fibers; in the application, the reinforcing fibers are added, food-grade tea polyphenol is used as a coordination bridge, and a room-temperature one-step modification process of aluminum ions and octyltrimethoxysilane is adopted, so that high-temperature baking or toxic reagents are not needed, the process is green and environment-friendly, and the natural structure of cotton fibers is not damaged; after modification, the skin-friendly and moisture-absorbing characteristics of cotton fibers are retained, the stiffness of nylon fabric is effectively improved, the secondary combination of the tea polyphenol-aluminum coordination structure and the functional groups on the surface of nylon 66 chip reinforcing fibers is formed, the interfacial bonding force between blended fibers is improved, and fabric pilling is reduced; a synergistic effect is formed with the modified nylon 66 filaments, the overall hydrophobic uniformity and washing resistance of the fabric are improved, the swelling and shrinkage of cotton fibers in a humid and hot environment are inhibited, and the size stability of the fabric is ensured.

Description

Technical Field

[0001] This invention relates to the field of nylon fabric preparation technology, and in particular to a high-strength nylon fabric and its preparation method. Background Technology

[0002] Nylon (also known as polyamide fiber, commonly known as nylon) is a synthetic fiber fabric known for its excellent abrasion resistance and high strength. It is lightweight and elastic, but has poor heat and light resistance, wrinkles easily, and is prone to static electricity. Therefore, it is widely used in the production of down jackets, yoga pants, sportswear, socks, as well as backpacks, tents, and other clothing and outdoor products that require durability.

[0003] Traditional nylon fabrics suffer from drawbacks such as stiffness, poor skin-friendliness, and a significant decrease in strength due to hydrolysis and oxidation in humid and hot environments. Pure cotton fibers have weak hydrophobicity, and when blended with nylon fibers, the interfacial bonding is insufficient, leading to pilling and fuzzing. They are also prone to swelling and shrinkage under humid and hot conditions. High-strength fabrics without spandex additives suffer from problems such as excessively low elongation at break, resulting in brittleness, or excessively high elongation at break, leading to deformation and loosening. Ordinary modified graphite nylon fibers suffer from large fluctuations in mechanical properties and insufficient tear strength due to graphite powder agglomeration. Based on these issues, this invention provides a high-strength nylon fabric and its preparation method. Summary of the Invention

[0004] The main objective of this invention is to provide a high-strength nylon fabric with high tear strength and high strength retention rate after wet heat aging, which is applied in a high-strength nylon fabric and its preparation method.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] This invention provides a high-strength nylon fabric, which comprises the following raw materials: 60-70 parts modified nylon 66 filament, 25-35 parts reinforcing fiber and 3-5 parts spandex fiber;

[0007] The preparation of the modified nylon 66 filament includes the following steps:

[0008] S1. Place the nylon 66 chips in a vacuum drying oven and dry them. Set the temperature to 125℃ and the vacuum degree to -0.09 to -0.1MPa. Dry for 12-16 hours to obtain dried nylon 66 chips.

[0009] S2. Place nylon 66 chips, modified graphite powder, polyethylene wax and 2,6-di-tert-butyl-p-cresol into a high-speed mixer and mix. Set the speed to 1500-1800 rpm and the temperature to 80℃. Mix for 20-25 minutes to obtain the mixture.

[0010] S3. The mixture is fed into a twin-screw extruder and extruded. The temperature from the feed inlet to the die head is set to 245℃, 255℃, 260℃, 265℃, and 260℃, the screw speed is 200-220 rpm, and the feeding speed is 15-20 kg / h. After extrusion, the mixture is passed through a 25℃ water bath and pelletized to a particle size of 2-3 mm to obtain functional masterbatch. The functional masterbatch is then placed in a vacuum drying oven and dried at a temperature of 120℃ and a vacuum degree of -0.09 to -0.1 MPa for 8 hours to obtain dried functional masterbatch.

[0011] S4. The drying masterbatch is extruded through a single screw spinning machine, spun into fibers, and subjected to secondary hot stretching and setting to obtain modified nylon 66 filament.

[0012] Furthermore, the modified nylon 66 filament comprises the following raw materials: 89.2 parts of dried nylon 66 chips, 10 parts of modified graphite powder, 0.5 parts of polyethylene wax, and 0.3 parts of 2,6-di-tert-butyl-p-cresol.

[0013] Furthermore, the preparation of the modified graphite powder includes the following steps:

[0014] A1. Add deionized water to the reaction vessel and stir at 300 rpm. Add sodium dodecylbenzenesulfonate and stir. Heat the reaction vessel to 40°C and stir at 300 rpm for 15 minutes. Add graphite powder and stir at 500 rpm for 30 minutes. Use an ultrasonic disperser to disperse at 300W for 30 minutes to obtain a suspension.

[0015] A2. Add sodium percarbonate to the suspension and stir. Heat to 60℃, stir at 300 rpm for 2 hours. Allow to cool naturally to 25℃. Centrifuge at 3000 rpm for 10 minutes. Filter out the supernatant, collect the precipitate, add an equal volume of deionized water, and centrifuge again. Repeat the centrifugation, precipitate collection, and centrifugation with an equal volume of deionized water three times. Add the centrifuged precipitate to anhydrous ethanol and disperse using an ultrasonic disperser at 300-500W for 15-30 minutes. Add γ-methacryloyloxypropyltrimethoxysilane and stir. Heat to 70℃, stir at 300 rpm for 1 hour. Dry in a vacuum drying oven at 60℃ and -0.05 to -0.07 MPa for 4-6 hours. Alternatively, dry at 80℃ and -0.08 to -0.095 MPa for 6-8 hours to obtain material A. Grind material A and pass it through a 100-mesh sieve to obtain modified graphite powder.

[0016] Furthermore, the mass ratio of deionized water, sodium dodecylbenzenesulfonate, and graphite powder in A1 is 90:1.75:14.

[0017] Graphite powder with a particle size ≤100 mesh and a purity ≥99% possesses a layered crystal structure that endows the material with high strength and high wear resistance. After oxidation modification and hydrophobic coating, the oxygen-containing active groups and hydrophobic groups introduced on its surface can respectively enhance the interfacial bonding force with the nylon matrix and endow the material with hydrophobic resistance to damp heat oxidation. It is the core functional reinforcing phase for the subsequent preparation of high-strength nylon reinforced fibers.

[0018] Furthermore, the mass ratio of sodium percarbonate to suspension in A2 is 1:80;

[0019] The mass ratio of the precipitate, anhydrous ethanol, and γ-methacryloyloxypropyltrimethoxysilane is 14:50:1.25.

[0020] Sodium percarbonate is of industrial grade with an active oxygen content of ≥13%. As a mild oxidant, sodium percarbonate plays a key role in the oxidation modification stage. Under constant temperature conditions of 60℃, it can mildly oxidize the surface of graphite powder, introducing oxygen-containing active groups such as hydroxyl and carboxyl groups. These groups not only provide reaction sites for subsequent grafting of silane coupling agents, but also enhance the interfacial compatibility between graphite powder and organic matrix. At the same time, mild oxidation modification does not destroy the layered crystal structure of graphite powder, and can also inhibit the oxidative degradation of graphite powder in subsequent humid and hot environments, thus improving its stability.

[0021] Further, the preparation of the reinforcing fiber includes the following steps: adding tea polyphenols and aluminum sulfate to deionized water, adding acetic acid and stirring at 200 rpm for 5 minutes, adding cotton fibers and stirring at 300 rpm for 10 minutes, adding octyltrimethoxysilane and stirring for 20 minutes, removing the cotton fibers, washing them with deionized water, drying the washed cotton fibers with a forced air fan at 60°C for 30 minutes to obtain the reinforcing fiber.

[0022] Tea polyphenols are food-grade. The polyhydroxy functional groups in their molecular structure can form stable coordination complexes with aluminum ions. At the same time, they can tightly bind with the hydroxyl groups on the surface of cotton fibers through hydrogen bonds, building a molecular bridge connecting aluminum ions and cotton fibers. The phenolic hydroxyl groups of tea polyphenols can catalyze the hydrolysis of the silicon-oxygen bonds of octyltrimethoxysilane without the addition of additional catalysts, realizing the in-situ grafting of silane hydrophobic groups on the surface of cotton fibers. Moreover, tea polyphenols are food-grade raw materials, green and environmentally friendly, and the modification process does not require high temperature and will not damage the natural structure of cotton fibers.

[0023] Octyltrimethoxysilane is a short-chain hydrophobic silane. The silicon-oxygen bonds in its molecule can be hydrolyzed under the catalysis of the phenolic hydroxyl groups of tea polyphenols. The generated active silanol groups can combine with the tea polyphenol-aluminum coordination bridge to achieve the directional grafting of short-chain alkyl groups on the surface of cotton fibers. The grafted octyl alkyl groups can form a dense hydrophobic layer on the surface of cotton fibers, giving cotton fibers excellent hydrophobicity. This has a synergistic effect with the hydrophobic properties of modified graphite nylon 66 fibers, improving the overall hydrophobic uniformity and washability of blended fabrics. At the same time, the short-chain alkyl structure does not increase the rigidity of cotton fibers, ensuring their softness.

[0024] Furthermore, the tea polyphenols and aluminum sulfate are added to deionized water, and the mass ratio of tea polyphenols, aluminum sulfate and deionized water is 0.25:0.125:100;

[0025] The mass ratio of tea polyphenols, cotton fiber, and octyltrimethoxysilane is 0.25:10:0.175.

[0026] Furthermore, the acetic acid has a mass concentration of 5-10%, and the pH is adjusted to 4-5 by adding acetic acid.

[0027] Secondly, the present invention provides a method for preparing a high-strength nylon fabric, comprising the following steps:

[0028] Step 1. Place the modified nylon 66 filament into the opening machine and open it. Set the speed to 800 rpm and open it for 5 minutes to obtain loose modified nylon 66 filament.

[0029] Step 2. Put the reinforcing fiber and loose modified nylon 66 filament into a blender and mix them. Set the speed to 500 rpm and mix for 10 minutes to obtain mixed fibers. Put the mixed fibers into a carding machine and card them. Set the cylinder speed to 300 rpm and the doffer speed to 50 rpm to obtain a mixed fiber web.

[0030] Step 3. The mixed fiber web and spandex fiber are drawn together using a three-stage drawing process to obtain a uniform fiber sliver. The uniform fiber sliver is then placed into a roving frame, with the speed set to 200 rpm, the draft ratio to 5, the roving twist to 80 twists / m, and the winding density to 0.35 g / cm³, to obtain roving. The roving is then placed into a spinning frame, with the speed set to 12000 rpm, the total draft ratio to 30, and the spinning twist to 500 twists / m, to obtain spinning yarn. The spinning yarn is then placed into a winding machine, with the speed set to 800 m / min and the winding tension to 0.3 cN / dtex, to obtain warp and weft yarns.

[0031] Step 4. Impregnate the warp yarns with sizing agent, set the sizing temperature to 80℃, the sizing speed to 15m / min, the sizing rate to 5-6%, and the drying temperature to 90℃. Then, put the weft yarns and the impregnated warp yarns into a rapier loom to weave, thus obtaining a high-strength nylon fabric.

[0032] Warp yarns account for 51-54%; weft yarns account for 46-49%.

[0033] Furthermore, the slurry is prepared by mixing polyvinyl alcohol, acrylate slurry, and deionized water;

[0034] The mass ratio of polyvinyl alcohol, acrylate slurry and deionized water is 5:3:92.

[0035] The present invention has the following beneficial effects:

[0036] 1. In this invention, modified nylon 66 filament is added. The sodium dodecylbenzenesulfonate pre-dispersion can effectively solve the problem of graphite powder agglomeration, allowing graphite to be evenly distributed in the nylon 66 chip matrix and avoiding stress concentration. The mild oxidation modification of sodium percarbonate can introduce oxygen-containing active groups on the graphite surface, greatly enhancing the interfacial bonding force between graphite and nylon 66 chips, and efficiently transferring external forces to improve fiber breaking strength. The subsequent hydrophobic coating of silane coupling agent gives the fiber excellent hydrophobic properties, which can block water penetration, inhibit the hydrolysis of nylon 66 chips and the oxidative degradation of graphite in humid and hot environments, significantly improve the fiber's humid and hot stability and service life, and its layered crystal structure can also enhance the fiber's abrasion resistance.

[0037] 2. In this invention, reinforcing fibers are added. These fibers utilize food-grade tea polyphenols as coordination bridges and are modified in a one-step room-temperature process using aluminum ions and octyltrimethoxysilane. This process eliminates the need for high-temperature baking or toxic reagents, making it environmentally friendly and preventing damage to the natural structure of cotton fibers. After modification, the skin-friendly and moisture-wicking properties of cotton fibers are retained, effectively improving the stiffness of nylon fabrics. Furthermore, the tea polyphenol-aluminum coordination structure forms a secondary bond with the functional groups on the surface of the nylon 66 chip reinforcing fibers, enhancing the interfacial bonding between blended fibers and reducing fabric pilling. Simultaneously, the hydrophobic properties imparted by octylsilane synergistically enhance the overall hydrophobic uniformity and washability of the fabric, while also inhibiting the swelling and shrinkage of cotton fibers in humid and hot environments, ensuring the dimensional stability of the fabric.

[0038] 3. In this invention, spandex fiber is added, which can give the fabric good tensile recovery and solve the problems of poor fit and difficulty in recovery after deformation that are common in high-strength nylon fabrics. At the same time, it has excellent compatibility with modified nylon 66 filament and reinforcing fiber. In the process of improving elasticity, it will not reduce the breaking strength, hydrophobicity and abrasion resistance of the fabric. Moreover, it is easy to achieve uniform blending with other fibers in the drawing process, without affecting the stability of subsequent spinning and weaving processes. Detailed Implementation

[0039] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0040] It should be noted that all raw materials used in the following experiments are commercially available.

[0041] The preparation methods of the modified nylon 66 filament, modified graphite powder, and reinforcing fiber in the following embodiments and comparative examples of the present invention are as follows:

[0042] I. Preparation of Modified Nylon 66 Filament

[0043] S1. Place the nylon 66 chips in a vacuum drying oven and dry them. Set the temperature to 125℃ and the vacuum degree to -0.09 to -0.1MPa. Dry for 12-16 hours to obtain dried nylon 66 chips.

[0044] S2. Place 89.2g of nylon 66 chips, 10g of modified graphite powder, 0.5g of polyethylene wax and 0.3g of 2,6-di-tert-butyl-p-cresol into a high-speed mixer and mix. Set the speed to 1500-1800 rpm and the temperature to 80℃. Mix for 20-25 minutes to obtain the mixture.

[0045] S3. The mixture is fed into a twin-screw extruder and extruded. The temperature from the feed inlet to the die head is set to 245℃, 255℃, 260℃, 265℃, and 260℃, the screw speed is 200-220 rpm, and the feeding speed is 15-20 kg / h. After extrusion, the mixture is passed through a 25℃ water bath and pelletized to a particle size of 2-3 mm to obtain functional masterbatch. The functional masterbatch is then placed in a vacuum drying oven and dried at a temperature of 120℃ and a vacuum degree of -0.09 to -0.1 MPa for 8 hours to obtain dried functional masterbatch.

[0046] S4. The drying masterbatch is extruded through a single screw spinning machine, spun into fibers, and subjected to secondary hot stretching and setting to obtain modified nylon 66 filament.

[0047] II. Preparation of Modified Graphite Powder

[0048] A1. Add 90g of deionized water to the reaction vessel and stir at 300 rpm. Add 1.75g ​​of sodium dodecylbenzenesulfonate and stir. Heat the reaction vessel to 40℃ and stir at 300 rpm for 15 minutes. Add 14g of graphite powder and stir at 500 rpm for 30 minutes. Disperse using an ultrasonic disperser with a power of 300W for 30 minutes to obtain a suspension.

[0049] A2. Add 1.25g of sodium percarbonate to the suspension and stir. Heat to 60℃, stir at 300rpm for 2 hours, and allow to cool naturally to 25℃. Centrifuge at 3000rpm for 10 minutes. Filter out the supernatant, collect the precipitate, add an equal volume of deionized water, and centrifuge again. Repeat the centrifugation process, collecting the precipitate and adding an equal volume of deionized water three times. Add 50g of anhydrous ethanol to the precipitate and disperse using an ultrasonic disperser with a power set to 300-5. Disperse at 00W for 15-30 minutes, add 1.25g of γ-methacryloxypropyltrimethoxysilane and stir. Heat to 70℃, stir at 300rpm for 1 hour, and dry in a vacuum drying oven at 60℃ and -0.05 to -0.07MPa for 4-6 hours. Then dry at 80℃ and -0.08 to -0.095MPa for 6-8 hours to obtain material A. Grind material A and pass it through a 100-mesh sieve to obtain modified graphite powder.

[0050] III. Preparation of the reinforcing fibers

[0051] Add 0.25g of tea polyphenols and 0.125g of aluminum sulfate to 100g of deionized water, add acetic acid to adjust the pH to 4-5, stir at 200 rpm for 5 minutes, add 10g of cotton fiber and stir at 300 rpm for 10 minutes, add 1.75g ​​of octyltrimethoxysilane and stir for 20 minutes, remove the cotton fiber, wash it with deionized water, and dry the washed cotton fiber with a forced air dryer at 60℃ for 30 minutes to obtain reinforced fiber.

[0052] Example 1: A high-strength nylon fabric, comprising the following raw materials: 60 parts modified nylon 66 filament, 25 parts reinforcing fiber and 3 parts spandex fiber.

[0053] A method for preparing a high-strength nylon fabric includes the following steps:

[0054] Step 1. Place the modified nylon 66 filament into the opening machine and open it. Set the speed to 800 rpm and open it for 5 minutes to obtain loose modified nylon 66 filament.

[0055] Step 2. Put the reinforcing fiber and loose modified nylon 66 filament into a blender and mix them. Set the speed to 500 rpm and mix for 10 minutes to obtain mixed fibers. Put the mixed fibers into a carding machine and card them. Set the cylinder speed to 300 rpm and the doffer speed to 50 rpm to obtain a mixed fiber web.

[0056] Step 3. The mixed fiber web and spandex fiber are drawn together using a three-stage drawing process to obtain a uniform fiber sliver. The uniform fiber sliver is then placed into a roving frame, with the speed set to 200 rpm, the draft ratio to 5, the roving twist to 80 twists / m, and the winding density to 0.35 g / cm³, to obtain roving. The roving is then placed into a spinning frame, with the speed set to 12000 rpm, the total draft ratio to 30, and the spinning twist to 500 twists / m, to obtain spinning yarn. The spinning yarn is then placed into a winding machine, with the speed set to 800 m / min and the winding tension to 0.3 cN / dtex, to obtain warp and weft yarns.

[0057] Step 4. Impregnate the warp yarns with sizing agent, set the sizing temperature to 80℃, the sizing speed to 15m / min, the sizing rate to 5-6%, and the drying temperature to 90℃. Then, put the weft yarns and the impregnated warp yarns into a rapier loom to weave, thus obtaining a high-strength nylon fabric.

[0058] The slurry is prepared by mixing polyvinyl alcohol, acrylate slurry, and deionized water.

[0059] The mass ratio of polyvinyl alcohol, acrylate slurry, and deionized water is 5:3:92.

[0060] Example 2: A high-strength nylon fabric, comprising the following raw materials: 65 parts modified nylon 66 filament, 30 parts reinforcing fiber and 4 parts spandex fiber.

[0061] A method for preparing a high-strength nylon fabric includes the following steps:

[0062] Step 1. Place the modified nylon 66 filament into the opening machine and open it. Set the speed to 800 rpm and open it for 5 minutes to obtain loose modified nylon 66 filament.

[0063] Step 2. Put the reinforcing fiber and loose modified nylon 66 filament into a blender and mix them. Set the speed to 500 rpm and mix for 10 minutes to obtain mixed fibers. Put the mixed fibers into a carding machine and card them. Set the cylinder speed to 300 rpm and the doffer speed to 50 rpm to obtain a mixed fiber web.

[0064] Step 3. The mixed fiber web and spandex fiber are drawn together using a three-stage drawing process to obtain a uniform fiber sliver. The uniform fiber sliver is then placed into a roving frame, with the speed set to 200 rpm, the draft ratio to 5, the roving twist to 80 twists / m, and the winding density to 0.35 g / cm³, to obtain roving. The roving is then placed into a spinning frame, with the speed set to 12000 rpm, the total draft ratio to 30, and the spinning twist to 500 twists / m, to obtain spinning yarn. The spinning yarn is then placed into a winding machine, with the speed set to 800 m / min and the winding tension to 0.3 cN / dtex, to obtain warp and weft yarns.

[0065] Step 4. Impregnate the warp yarns with sizing agent, set the sizing temperature to 80℃, the sizing speed to 15m / min, the sizing rate to 5-6%, and the drying temperature to 90℃. Then, put the weft yarns and the impregnated warp yarns into a rapier loom to weave, thus obtaining a high-strength nylon fabric.

[0066] The slurry is prepared by mixing polyvinyl alcohol, acrylate slurry, and deionized water.

[0067] The mass ratio of polyvinyl alcohol, acrylate slurry, and deionized water is 5:3:92.

[0068] Example 3: A high-strength nylon fabric, comprising the following raw materials: 70 parts modified nylon 66 filament, 35 parts reinforcing fiber and 5 parts spandex fiber.

[0069] A method for preparing a high-strength nylon fabric includes the following steps:

[0070] Step 1. Place the modified nylon 66 filament into the opening machine and open it. Set the speed to 800 rpm and open it for 5 minutes to obtain loose modified nylon 66 filament.

[0071] Step 2. Put the reinforcing fiber and loose modified nylon 66 filament into a blender and mix them. Set the speed to 500 rpm and mix for 10 minutes to obtain mixed fibers. Put the mixed fibers into a carding machine and card them. Set the cylinder speed to 300 rpm and the doffer speed to 50 rpm to obtain a mixed fiber web.

[0072] Step 3. The mixed fiber web and spandex fiber are drawn together using a three-stage drawing process to obtain a uniform fiber sliver. The uniform fiber sliver is then placed into a roving frame, with the speed set to 200 rpm, the draft ratio to 5, the roving twist to 80 twists / m, and the winding density to 0.35 g / cm³, to obtain roving. The roving is then placed into a spinning frame, with the speed set to 12000 rpm, the total draft ratio to 30, and the spinning twist to 500 twists / m, to obtain spinning yarn. The spinning yarn is then placed into a winding machine, with the speed set to 800 m / min and the winding tension to 0.3 cN / dtex, to obtain warp and weft yarns.

[0073] Step 4. Impregnate the warp yarns with sizing agent, set the sizing temperature to 80℃, the sizing speed to 15m / min, the sizing rate to 5-6%, and the drying temperature to 90℃. Then, put the weft yarns and the impregnated warp yarns into a rapier loom to weave, thus obtaining a high-strength nylon fabric.

[0074] The slurry is prepared by mixing polyvinyl alcohol, acrylate slurry, and deionized water.

[0075] The mass ratio of polyvinyl alcohol, acrylate slurry, and deionized water is 5:3:92.

[0076] Comparative Example 1: The difference between this comparative example and Example 1 is that:

[0077] Unmodified nylon 66 chips were not used in this comparative example.

[0078] Comparative Example 2: The difference between this comparative example and Example 1 is that:

[0079] No reinforcing fibers were used in this comparative example.

[0080] Comparative Example 3 differs from Example 1 in that:

[0081] Spandex fiber was not used in this comparative example.

[0082] Performance testing: The high-strength nylon fabrics prepared in Examples 1, 2, 3, Comparative Examples 1, 2, and 3 were tested.

[0083] Performance testing: The relevant properties of the high-strength nylon fabric and its preparation method provided in Examples 1-3 and Comparative Examples 1-3 were tested respectively, and the test data are recorded in Table 1 below:

[0084]

[0085] Based on the above data, the following conclusions can be drawn:

[0086] (1) The tear strength of Examples 1-3 is far superior to that of Comparative Examples 1-3. The key point is that the examples add modified nylon 66 filaments. The modified graphite powder uniformly dispersed inside the fibers can effectively transfer tear stress and prevent the rapid propagation of cracks by means of the layered crystal structure. At the same time, the strong interfacial bonding force formed between the graphite powder and the nylon 66 chip matrix through oxidation modification and hydrophobic coating can avoid stress concentration caused by the separation of graphite particles from the matrix during tearing.

[0087] (2) The strength retention rate of Examples 1-3 after damp heat aging is much better than that of Comparative Examples 1-3. The key point is that the examples add reinforcing fibers, and the coordination bridge formed by tea polyphenols and aluminum ions in their molecular structure can form stable cross-links with the hydroxyl groups on the surface of cotton fibers and the oxygen-containing groups on the surface of modified nylon 66 filaments, thereby enhancing the interfacial bonding force between blended fibers and reducing the slippage and peeling between fibers under damp heat conditions.

[0088] (3) The breaking elongation of Examples 1-3 is far superior to that of Comparative Examples 1-3. The key point is that by adding spandex fiber, when the fabric is subjected to tensile external force, the spandex fiber will undergo elastic deformation first, absorb and disperse the external force, delay the breaking process of modified nylon 66 filament and reinforcing fiber, thereby improving the overall extensibility of the fabric.

[0089] Through the above demonstrations, the present invention is significantly superior to the control group in terms of tear strength, strength retention rate after damp heat aging, and elongation at break, thus verifying the advanced nature and rationality of the preparation process.

[0090] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0091] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A high-strength nylon fabric, characterized in that, The high-strength nylon fabric comprises the following raw materials: 60-70 parts modified nylon 66 filament, 25-35 parts reinforcing fiber, and 3-5 parts spandex fiber; The preparation of the modified nylon 66 filament includes the following steps: S1. Dry the nylon 66 chips to obtain dried nylon 66 chips; S2. Mix nylon 66 chips, modified graphite powder, polyethylene wax and 2,6-di-tert-butyl-p-cresol to obtain a mixture; S3. The mixture is fed into a twin-screw extruder and extruded to obtain functional masterbatch; the functional masterbatch is dried to obtain dried functional masterbatch; S4. The drying masterbatch is extruded through a single screw spinning machine, spun into fibers, and subjected to two-stage hot stretching and setting to obtain modified nylon 66 filament. The preparation of the modified graphite powder includes the following steps: A1. Add deionized water to the reaction vessel and stir. Add sodium dodecylbenzenesulfonate and graphite powder and stir. Disperse the mixture using an ultrasonic disperser to obtain a suspension. A2. Add sodium percarbonate to the suspension and stir. Centrifuge, filter out the supernatant, collect the precipitate, add an equal volume of deionized water and centrifuge again. Repeat centrifugation, collect the precipitate, add an equal volume of deionized water and centrifuge again. Add the centrifuged precipitate to anhydrous ethanol and disperse it using an ultrasonic disperser. Add γ-methacryloxypropyltrimethoxysilane and stir. Dry it using a vacuum drying oven to obtain material A. Grind material A to obtain modified graphite powder.

2. The high-strength nylon fabric according to claim 1, characterized in that, The modified nylon 66 filament comprises the following raw materials: 89.2 parts dried nylon 66 chips, 10 parts modified graphite powder, 0.5 parts polyethylene wax, and 0.3 parts 2,6-di-tert-butyl-p-cresol.

3. The high-strength nylon fabric according to claim 1, characterized in that, The mass ratio of deionized water, sodium dodecylbenzenesulfonate, and graphite powder in A1 is 90:1.75:

14.

4. The high-strength nylon fabric according to claim 1, characterized in that, The mass ratio of sodium percarbonate to suspension in A2 is 1:80; The mass ratio of the precipitate, anhydrous ethanol, and γ-methacryloyloxypropyltrimethoxysilane is 14:50:1.

25.

5. The high-strength nylon fabric according to claim 1, characterized in that, The preparation of the reinforcing fiber includes the following steps: Add tea polyphenols and aluminum sulfate to deionized water, add acetic acid and stir, add cotton fibers and stir, add octyltrimethoxysilane and stir, remove the cotton fibers, wash with deionized water, and dry the washed cotton fibers with a blower to obtain reinforcing fibers.

6. The high-strength nylon fabric according to claim 5, characterized in that, The tea polyphenols and aluminum sulfate are added to deionized water, and the mass ratio of tea polyphenols, aluminum sulfate and deionized water is 0.25:0.125:

100. The mass ratio of tea polyphenols, cotton fiber, and octyltrimethoxysilane is 0.25:10:0.

175.

7. The high-strength nylon fabric according to claim 5, characterized in that, The acetic acid has a mass concentration of 5-10%, and the pH is adjusted to 4-5 by adding acetic acid.

8. A method for preparing a high-strength nylon fabric according to any one of claims 1 to 7, characterized in that, Includes the following steps: Step 1. Place the modified nylon 66 filament into the opening machine to open it, and obtain loose modified nylon 66 filament; Step 2. Put the reinforcing fiber and loose modified nylon 66 filament into a blending machine to mix them and obtain mixed fibers. Put the mixed fibers into a carding machine to card them and obtain a mixed fiber web. Step 3. The mixed fiber web and spandex fiber are drawn together through a three-stage drawing process to obtain a uniform fiber sliver. The uniform fiber sliver is fed into a roving frame to obtain roving. The roving is fed into a spinning frame to obtain spinning yarn. The spinning yarn is fed into a winding machine to obtain warp and weft yarns. Step 4. Impregnate the warp yarns with sizing agent, and then place the weft yarns and the impregnated warp yarns into a rapier loom for weaving to obtain a high-strength nylon fabric.

9. The method for preparing high-strength nylon fabric according to claim 8, characterized in that, The slurry is prepared by mixing polyvinyl alcohol, acrylate slurry and deionized water; The mass ratio of polyvinyl alcohol, acrylate slurry and deionized water is 5:3:92.

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