High-strength uv-resistant tent fabric and method of making same

Abstract

The application discloses a kind of high-strength ultraviolet-resistant tent fabric and preparation method thereof, comprising the following steps: step one, after drying nylon 6 is mixed with nano reinforcing particles, then granulated by double screw extruder, obtain high concentration reinforcing masterbatch;Step two, nylon 6, high concentration reinforcing masterbatch, auxiliary agent are mixed evenly, then added into screw type melt spinning machine, after melt passes through filter screen, extruded to form melt stream by spinneret, cooled and solidified into sliver after high-speed stretching, obtain nylon filament;Step three, nylon filament is used as warp and weft, woven into grey cloth on air-jet loom, then the grey cloth is subjected to dyeing and finishing process, and the high-strength ultraviolet-resistant tent fabric is obtained. By adding specific nano reinforcing particles, setting specific spinning and weaving parameters and specifying the specification of nylon multifilament, not only the high physical strength of the fabric is realized, but also the ultraviolet resistance of the fabric is improved.

Description

Technical Field

[0001] This invention belongs to the field of fabric technology, specifically relating to a high-strength UV-resistant tent fabric and its preparation method. Background Technology

[0002] Tents, as a key piece of equipment widely used in outdoor camping, mountaineering, fieldwork, and military applications, rely heavily on the performance of their core component—the tent fabric—which directly determines the tent's protective capabilities, lifespan, and overall reliability. Typically, tent fabrics need to possess a combination of properties including lightweight, high strength, tear resistance, water resistance, windproofing, and excellent weather resistance to cope with complex and varied outdoor environments. Nylon (polyamide fiber), due to its excellent strength, abrasion resistance, and good elasticity, has become the mainstream material for manufacturing mid-to-high-end tent fabrics. The performance of the fabric depends not only on the chemical properties of the fiber itself but also on its physical structural parameters such as denier, weave density, and finishing processes.

[0003] However, existing tent fabric technologies still suffer from inherent performance contradictions and bottlenecks. On the one hand, in pursuit of lightweighting, fabrics typically use finer fibers or lower weave densities, but this often comes at the cost of sacrificing their absolute physical strength and tear resistance. On the other hand, nylon materials are inherently sensitive to ultraviolet radiation; prolonged exposure to sunlight triggers photo-oxidation and thermo-oxidative aging reactions, leading to polymer chain breakage. Macroscopically, this manifests as a sharp decline in fabric strength, brittleness, easy tearing, and severe fading, significantly limiting the lifespan of tents in high-UV environments such as high altitudes and beaches. To address this issue, existing technologies typically employ the addition of UV absorbers and antioxidants during nylon spinning or finishing processes.

[0004] Chinese patent application CN117166117A discloses a method for preparing UV-protective tent fabric, comprising the following raw materials: 40%–60% polyester fiber, 20%–30% nylon fiber, 10%–20% wool fiber, 10%–20% pure cotton fiber, 5%–10% UV protectant, and 5%–10% functional additives. By interweaving these different fiber layers (polyester, nylon, wool, and cotton) together, the fiber layers are increased. Different layers of fibers possess different UV protection properties, thus providing more comprehensive UV protection. The addition of UV protectant and functional additives enhances breathability, comfort, antibacterial properties, and durability in addition to UV protection, thereby improving the overall performance of the fabric. Chinese patent application CN109016759A discloses an antibacterial and UV-protective tent fabric. This fabric comprises a recycled polyethylene fiber outer layer, a TPU film middle layer, and a high-density recycled fiber inner layer. The fabric is immersed in a dispersion system containing nano-TiO2 and then manufactured through padding. This invention, through the rational design of the soaking tank structure, allows the dispersion system to be densely and evenly distributed on the upper and lower surfaces of the base fabric, resulting in tent fabric with uniform performance and excellent UV resistance, making it highly suitable for outdoor travel and possessing great practicality. However, the above solution, through a simple physical blending method, has some technical drawbacks: these small molecule additives do not have a strong bond with the polymer matrix. During actual use of the tent, they will gradually migrate and be lost due to factors such as rain rinsing, sun evaporation, physical friction, and repeated folding, causing the protective performance of the fabric to be greatly reduced in a short period of time, failing to achieve long-term protection. Essentially, it is a consumable and non-permanent technical solution. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the present invention aims to provide a high-strength UV-resistant tent fabric and its preparation method.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A method for preparing a high-strength UV-resistant tent fabric includes the following steps:

[0008] Step 1: After drying Nylon 6, mix it with nano-reinforcing particles, and then granulate it through a twin-screw extruder to obtain a high-concentration reinforcing masterbatch;

[0009] Step 2: Mix Nylon 6, high-concentration reinforcing masterbatch, and additives evenly, and then add them to a screw-type melt spinning machine. After the melt passes through a filter screen, it is extruded through a microporous spinneret to form multiple fine melt streams. After cooling and solidification, it is formed into multiple filaments, which are then bundled, oiled, stretched at high speed, and wound to form nylon multifilaments.

[0010] Step 3: Using nylon filaments as warp and weft yarns, weave them into a greige fabric on an air-jet loom. Then, perform dyeing and finishing processes on the greige fabric to obtain the high-strength UV-resistant tent fabric.

[0011] In this invention, the nano-reinforcing particles are first forcibly and fully dispersed with nylon under the high shear force of a twin-screw extruder to produce an easy-to-handle masterbatch. Compared with the "one-step method" of directly adding a small amount of nanoparticles to a large batch of resin, the method of this invention can effectively improve the problem of severe agglomeration of nanomaterials in polymer melts due to van der Waals forces, ensuring that the nano-reinforcing particles can be uniformly distributed in the final nylon multifilament, thereby avoiding stress concentration points and spinning defects.

[0012] Preferably, the mass ratio of nylon 6 to nano-reinforcing particles in step one is 92-95:5-8, and the temperature of the extruder is 230-250℃.

[0013] Preferably, in step two, the mass ratio of nylon 6, high-concentration reinforcing masterbatch, and additives is 88-92:8-12:0.4-0.7; the additives consist of antioxidant 455, antioxidant 168, and zinc stearate in a mass ratio of 3-5:2-3:2-3; the draw ratio of the high-speed stretching is 3-4; and the specifications of the nylon multifilament are 70D / 48f or 80D / 68f.

[0014] Preferably, the warp density of the weaving in step three is 45-55 threads / cm, and the weft density is 35-45 threads / cm.

[0015] In this invention, by setting specific spinning and weaving parameters and specifying the specifications of nylon multifilament, the fabric is guaranteed to have both high strength and excellent softness. Further limiting the high warp and weft density weaving parameters enables the yarns to be arranged to form a fabric with a dense structure and small pores, which not only achieves high physical strength of the fabric, but also improves the tear resistance of the fabric.

[0016] Preferably, the method for preparing the nano-reinforcing particles includes the following steps:

[0017] S1. Carbon nanotubes are added to nitric acid solution, impregnated, filtered, washed and dried, then added to ethanol aqueous solution, followed by γ-glycidoxypropyltrimethoxysilane, and stirred to react. After the reaction is completed, the mixture is filtered, washed and dried to obtain pretreated carbon nanotubes.

[0018] S2. Add the pretreated carbon nanotubes from step S1 to DMF, then add 12-aminododecanoic acid, and heat the reaction. After the reaction is complete, filter, wash, and dry to obtain organic carbon nanotubes.

[0019] S3. Add the organic carbon nanotubes from step S2 to DMF. Under nitrogen protection, add EDC and NHS, stir and activate, then add 5-aminobenzotriazole and carry out a constant temperature reaction. After the preset time, add 3,5-di-tert-butyl-4-hydroxybenzylamine and continue the reaction for 6-8 hours. After the reaction is completed, filter, wash and dry to obtain nano-reinforced particles.

[0020] Preferably, the mass concentration of the nitric acid solution in step S1 is 10-15%, the immersion temperature is 30-40°C, and the immersion time is 1-2 hours.

[0021] Preferably, in step S1, the ethanol aqueous solution has a mass concentration of 70-80%, the mass ratio of carbon nanotubes to γ-glycidoxypropyltrimethoxysilane is 50-60:4-7, the stirring reaction temperature is 60-70℃, and the time is 2-3h.

[0022] In this invention, carbon nanotubes are acid-treated to introduce oxygen-containing functional groups at defect sites on their surface, thereby improving their dispersibility and subsequent reaction activity; then they are reacted with γ-glycidoxypropyltrimethoxysilane to introduce more reactive epoxy groups, which is beneficial to the subsequent reaction.

[0023] Preferably, in step S2, the mass ratio of the pretreated carbon nanotubes to 12-aminododecanoic acid is 50-60:4-7, the heating reaction temperature is 60-80℃, and the time is 3-4h.

[0024] In this invention, 12-aminododecanoic acid is introduced into the carbon nanotubes by reacting the epoxy groups on the carbon nanotubes with the amino groups on the 12-aminododecanoic acid. The flexible long chains in 12-aminododecanoic acid are similar to the molecular structure of nylon, which greatly improves the physical entanglement and compatibility between the carbon nanotubes and the nylon matrix. At the same time, reactive carboxyl groups are introduced, which is beneficial to the subsequent reaction. Furthermore, the introduction of 12-aminododecanoic acid can also effectively prevent the carbon nanotubes from agglomerating again during the nylon melt processing, ensuring uniform dispersion and maximizing the reinforcing effect of the carbon nanotubes.

[0025] Preferably, in step S3, the mass ratio of the organic carbon nanotubes, EDC, NHS, 5-aminobenzotriazole, and 3,5-di-tert-butyl-4-hydroxybenzylamine is 50-60:6-8:4-6:2-3:2.5-4; the stirring activation temperature is 4-8℃, and the time is 2-3 hours; the isothermal reaction temperature is 20-30℃, and the preset time is 6-8 hours.

[0026] In this invention, the carboxyl group of 12-aminododecanoic acid on carbon nanotubes reacts with the amino groups on 5-aminobenzotriazole and 3,5-di-tert-butyl-4-hydroxybenzylamine, thereby introducing the two into the carbon nanotubes through chemical bonding. The benzotriazole ring structure in the 5-aminobenzotriazole molecule can efficiently absorb high-energy ultraviolet light and convert it into harmless heat energy; 3,5-di-tert-butyl-4-hydroxybenzylamine can efficiently capture peroxide free radicals generated by light and heat, terminating the chain reaction of degradation. The synergistic effect of the two gives the final fabric excellent UV resistance. By first introducing the sterically less hindered 5-aminobenzotriazole into the carbon nanotubes, and then adding the sterically more hindered 3,5-di-tert-butyl-4-hydroxybenzylamine for reaction, it is ensured that both additives can achieve the preset high grafting rate and controllable ratio, fundamentally avoiding the problem of poor performance uniformity caused by the uncontrollability of simultaneous reactions.

[0027] This invention also protects a high-strength UV-resistant tent fabric prepared by the method described above.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] (1) The high-strength UV-resistant tent fabric provided by the present invention effectively solves the technical bottlenecks of traditional nylon fabrics, such as difficulty in balancing mechanical properties and weather resistance, easy migration and failure of functional additives, and difficulty in dispersing nanomaterials, by introducing specially designed nano-reinforcing particles into the nylon 6 matrix and combining optimized spinning and weaving processes. This fabric not only has a breaking strength and tear resistance far exceeding those of conventional nylon, but also has excellent UV resistance and thermo-oxidative aging resistance due to the permanent immobilization of its functional groups, ensuring its structural stability and ultra-long service life in harsh outdoor environments, and achieving a significant improvement in overall performance.

[0030] (2) The high-strength UV-resistant tent fabric provided by this invention incorporates nano-reinforcing particles. These particles are introduced by first introducing 12-aminododecanoic acid onto carbon nanotubes, followed by chemical bonding of two functional substances: 5-aminobenzotriazole and 3,5-di-tert-butyl-4-hydroxybenzylamine. The 12-aminododecanoic acid acts as a flexible long-chain spacer arm, effectively preventing the re-aggregation of carbon nanotubes through steric hindrance. Furthermore, it tightly binds the carbon nanotubes to the nylon matrix through physical entanglement and hydrogen bonding with the surrounding nylon molecular chains, significantly improving the... The improved interfacial compatibility between nanoparticles and the nylon matrix allows for more uniform dispersion of nano-reinforcing particles, thereby maximizing their reinforcing potential. Compared to direct physical blending, 5-aminobenzotriazole and 3,5-di-tert-butyl-4-hydroxybenzylamine molecules are grafted onto the surface of carbon nanotubes through stable covalent bonds. The carbon nanotubes themselves are deeply entangled with the nylon matrix through long, flexible chains, reducing the problem of small molecules migrating to the fabric surface and then being lost through evaporation or rainwater rinsing during long-term use of the tent, thus improving the durability of the fabric.

[0031] (3) The high-strength UV-resistant tent fabric provided by the present invention adopts a two-step process of "preparing a high-concentration masterbatch first, and then diluting and mixing for spinning". In this process, under the high shear action of the twin-screw extruder, the nano-reinforcing particles and nylon are forcibly and fully dispersed to make an easy-to-handle masterbatch. Compared with the "one-step method" of directly adding a small amount of nano-powder to a large batch of resin, the method of the present invention can effectively improve the problem of serious agglomeration of nanomaterials in polymer melt due to van der Waals forces, and ensure that the nano-reinforcing particles can be evenly distributed in the final nylon multifilament, thereby avoiding stress concentration points and spinning defects. Detailed Implementation

[0032] The technical solution 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.

[0033] Unless otherwise specified, all chemical reagents and materials in this invention are purchased from the market or synthesized from raw materials purchased from the market.

[0034] The nylon 6 is grade Ube 1022T from Japan, and the carbon nanotubes have a diameter of 15-25 nm and a length of 3-6 μm.

[0035] Example 1

[0036] A method for preparing a high-strength UV-resistant tent fabric includes the following steps:

[0037] Step 1: After drying Nylon 6 to a moisture content of less than 0.02%, mix it with nano-reinforcing particles at a mass ratio of 93:7. Then, granulate the mixture using a twin-screw extruder. The temperatures of the twin-screw extruder from the feeding section to the die section are set to 230℃, 240℃, 250℃, 250℃, and 245℃ respectively to obtain high-concentration reinforcing masterbatch.

[0038] Step 2: Mix Nylon 6, high-concentration reinforcing masterbatch, and additives evenly. The mass ratio of Nylon 6, high-concentration reinforcing masterbatch, and additives (antioxidant 445, antioxidant 168, and zinc stearate in a mass ratio of 4:3:3) is 90:10:0.6. Then, add the mixture to a screw-type melt spinning machine. After passing through a filter screen, the melt is extruded through a microporous spinneret to form multiple fine melt streams. After cooling and solidification, the melt is formed into multiple filaments. Then, the filaments are bundled, oiled, stretched at high speed (stretch ratio of 3.5), and wound to obtain nylon multifilaments with a specification of 70D / 48f.

[0039] Step 3: Using nylon multifilaments as warp and weft yarns, weave them into a greige fabric on an air-jet loom with a warp density of 50 threads / cm and a weft density of 40 threads / cm. Then, the greige fabric undergoes dyeing and finishing processes to obtain the high-strength UV-resistant tent fabric.

[0040] The method for preparing the nano-reinforcing particles includes the following steps:

[0041] S1. Add 55g of carbon nanotubes to 1L of 15% nitric acid solution and immerse at 35℃ for 1.5h. Then filter, wash and dry. Add 1L of ethanol aqueous solution (ethanol concentration is 75%) and then add 6g of γ-glycidoxypropyltrimethoxysilane. Stir and react at 65℃ for 2.5h. After the reaction is completed, filter, wash and dry to obtain pretreated carbon nanotubes.

[0042] S2. Add 55g of pretreated carbon nanotubes from step S1 to 1L of DMF, then add 6g of 12-aminododecanoic acid, and react at 70℃ for 3.5h under a nitrogen atmosphere. After the reaction is complete, filter, wash and dry to obtain organic carbon nanotubes.

[0043] S3. Add 55g of organic carbon nanotubes from step S2 to 1L of DMF. Under nitrogen protection, add 7g of EDC and 5g of NHS. After stirring and activating at 6℃ for 2.5h, add 2.5g of 5-aminobenzotriazole and react at 25℃ for 7h. After the reaction is completed, add 3.5g of 3,5-di-tert-butyl-4-hydroxybenzylamine and continue the reaction at 25℃ for 7h. After the reaction is completed, filter, wash and dry to obtain nano-reinforced particles.

[0044] Example 2

[0045] A method for preparing a high-strength UV-resistant tent fabric includes the following steps:

[0046] Step 1: After drying Nylon 6 to a moisture content of less than 0.02%, mix it with nano-reinforcing particles at a mass ratio of 95:5. Then, granulate the mixture using a twin-screw extruder. The temperatures of the twin-screw extruder from the feeding section to the die section are set to 230℃, 240℃, 250℃, 250℃, and 245℃ respectively to obtain high-concentration reinforcing masterbatch.

[0047] Step 2: Mix Nylon 6, high-concentration reinforcing masterbatch, and additives evenly. The mass ratio of Nylon 6, high-concentration reinforcing masterbatch, and additives (antioxidant 445, antioxidant 168, and zinc stearate in a mass ratio of 5:2:3) is 92:8:0.4. Then, add the mixture to a screw-type melt spinning machine. After passing through a filter screen, the melt is extruded through a microporous spinneret to form multiple fine melt streams. After cooling and solidification, the melt is formed into multiple filaments. Then, the filaments are bundled, oiled, stretched at high speed (stretch ratio of 3.5), and wound to obtain nylon multifilaments with a specification of 70D / 48f.

[0048] Step 3: Using nylon multifilaments as warp and weft yarns, weave them into a greige fabric on an air-jet loom with a warp density of 50 threads / cm and a weft density of 40 threads / cm. Then, the greige fabric undergoes dyeing and finishing processes to obtain the high-strength UV-resistant tent fabric.

[0049] The method for preparing the nano-reinforcing particles includes the following steps:

[0050] S1. Add 50g of carbon nanotubes to 1L of 10% nitric acid solution and soak at 30℃ for 2h. Then filter, wash and dry. Then add 1L of ethanol aqueous solution (ethanol mass concentration is 70%), followed by 4g of γ-glycidoxypropyltrimethoxysilane. Stir and react at 60℃ for 3h. After the reaction is completed, filter, wash and dry to obtain pretreated carbon nanotubes.

[0051] S2. Add 50g of pretreated carbon nanotubes from step S1 to 1L of DMF, then add 4g of 12-aminododecanoic acid, and react at 60℃ for 4h under nitrogen atmosphere. After the reaction is completed, filter, wash and dry to obtain organic carbon nanotubes.

[0052] S3. Add 50g of organic carbon nanotubes from step S2 to 1L of DMF. Under nitrogen protection, add 6g of EDC and 4g of NHS. After stirring and activating at 4℃ for 3h, add 2g of 5-aminobenzotriazole and react at 20℃ for 8h. After the reaction is completed, add 2.5g of 3,5-di-tert-butyl-4-hydroxybenzylamine and continue the reaction at 20℃ for 8h. After the reaction is completed, filter, wash and dry to obtain nano-reinforced particles.

[0053] Example 3

[0054] A method for preparing a high-strength UV-resistant tent fabric includes the following steps:

[0055] Step 1: After drying Nylon 6 to a moisture content of less than 0.02%, mix it with nano-reinforcing particles at a mass ratio of 92:8. Then, granulate the mixture using a twin-screw extruder. The temperatures of the twin-screw extruder from the feeding section to the die section are set to 230℃, 240℃, 250℃, 250℃, and 245℃ respectively to obtain high-concentration reinforcing masterbatch.

[0056] Step 2: Mix Nylon 6, high-concentration reinforcing masterbatch, and additives evenly. The mass ratio of Nylon 6, high-concentration reinforcing masterbatch, and additives (antioxidant 445, antioxidant 168, and zinc stearate in a mass ratio of 5:3:2) is 88:12:0.7. Then, add the mixture to a screw-type melt spinning machine. After passing through a filter screen, the melt is extruded through a microporous spinneret to form multiple fine melt streams. After cooling and solidification, the melt is formed into multiple filaments. Then, the filaments are bundled, oiled, stretched at high speed (stretch ratio of 3.5), and wound to obtain nylon multifilaments with a specification of 70D / 48f.

[0057] Step 3: Using nylon multifilaments as warp and weft yarns, weave them into a greige fabric on an air-jet loom with a warp density of 50 threads / cm and a weft density of 40 threads / cm. Then, the greige fabric undergoes dyeing and finishing processes to obtain the high-strength UV-resistant tent fabric.

[0058] The method for preparing the nano-reinforcing particles includes the following steps:

[0059] S1. Add 60g of carbon nanotubes to 1L of 15% nitric acid solution and immerse at 40℃ for 1h. Then filter, wash and dry. Add 1L of ethanol aqueous solution (ethanol concentration of 80%) and then add 7g of γ-glycidoxypropyltrimethoxysilane. Stir and react at 70℃ for 2h. After the reaction is completed, filter, wash and dry to obtain pretreated carbon nanotubes.

[0060] S2. Add 60g of pretreated carbon nanotubes from step S1 to 1L of DMF, then add 7g of 12-aminododecanoic acid, and react at 80℃ for 3h under nitrogen atmosphere. After the reaction is completed, filter, wash and dry to obtain organic carbon nanotubes.

[0061] S3. Add 60g of organic carbon nanotubes from step S2 to 1L of DMF. Under nitrogen protection, add 8g of EDC and 6g of NHS. After stirring and activating at 8℃ for 2h, add 3g of 5-aminobenzotriazole. React at 30℃ for 6h. After the reaction is completed, add 4g of 3,5-di-tert-butyl-4-hydroxybenzylamine. Continue the reaction at 30℃ for 6h. After the reaction is completed, filter, wash and dry to obtain nano-reinforced particles.

[0062] Comparative Example 1

[0063] A method for preparing a high-strength UV-resistant tent fabric includes the following steps:

[0064] Step 1: After drying Nylon 6 to a moisture content of less than 0.02%, mix it with nano-reinforcing particles at a mass ratio of 93:7. Then, granulate the mixture using a twin-screw extruder. The temperatures of the twin-screw extruder from the feeding section to the die section are set to 230℃, 240℃, 250℃, 250℃, and 245℃ respectively to obtain high-concentration reinforcing masterbatch.

[0065] Step 2: Mix Nylon 6, high-concentration reinforcing masterbatch, and additives evenly. The mass ratio of Nylon 6, high-concentration reinforcing masterbatch, and additives (antioxidant 445, antioxidant 168, and zinc stearate in a mass ratio of 4:3:3) is 90:10:0.6. Then, add the mixture to a screw-type melt spinning machine. After passing through a filter screen, the melt is extruded through a microporous spinneret to form multiple fine melt streams. After cooling and solidification, the melt is formed into multiple filaments. Then, the filaments are bundled, oiled, stretched at high speed (stretch ratio of 3.5), and wound to obtain nylon multifilaments with a specification of 70D / 48f.

[0066] Step 3: Using nylon multifilaments as warp and weft yarns, weave them into a greige fabric on an air-jet loom with a warp density of 50 threads / cm and a weft density of 40 threads / cm. Then, the greige fabric undergoes dyeing and finishing processes to obtain the high-strength UV-resistant tent fabric.

[0067] The method for preparing the nano-reinforcing particles includes the following steps:

[0068] S1. Add 55g of carbon nanotubes to 1L of 15% nitric acid solution and immerse at 35℃ for 1.5h. Then filter, wash and dry. Add 1L of ethanol aqueous solution (ethanol concentration is 75%) and then add 6g of γ-glycidoxypropyltrimethoxysilane. Stir and react at 65℃ for 2.5h. After the reaction is completed, filter, wash and dry to obtain pretreated carbon nanotubes.

[0069] S2. Add 55g of pretreated carbon nanotubes from step S1 to 1L of DMF, then add 6g of 12-aminododecanoic acid, and react at 70℃ for 3.5h under a nitrogen atmosphere. After the reaction is complete, filter, wash and dry to obtain organic carbon nanotubes.

[0070] S3. Add 55g of organic carbon nanotubes from step S2 to 1L of DMF. Under nitrogen protection, add 7g of EDC and 5g of NHS. Stir and activate at 6℃ for 2.5h, then add 2.5g of 5-aminobenzotriazole. React at 25℃ for 7h. After the reaction is complete, filter, wash and dry to obtain nano-reinforced particles.

[0071] Compared to Example 1, 3,5-di-tert-butyl-4-hydroxybenzylamine was not introduced into the nano-reinforcing particles of this comparative example.

[0072] Comparative Example 2

[0073] A method for preparing a high-strength UV-resistant tent fabric includes the following steps:

[0074] Step 1: After drying Nylon 6 to a moisture content of less than 0.02%, mix it with nano-reinforcing particles at a mass ratio of 93:7. Then, granulate the mixture using a twin-screw extruder. The temperatures of the twin-screw extruder from the feeding section to the die section are set to 230℃, 240℃, 250℃, 250℃, and 245℃ respectively to obtain high-concentration reinforcing masterbatch.

[0075] Step 2: Mix Nylon 6, high-concentration reinforcing masterbatch, and additives evenly. The mass ratio of Nylon 6, high-concentration reinforcing masterbatch, and additives (antioxidant 445, antioxidant 168, and zinc stearate in a mass ratio of 4:3:3) is 90:10:0.6. Then, add the mixture to a screw-type melt spinning machine. After passing through a filter screen, the melt is extruded through a microporous spinneret to form multiple fine melt streams. After cooling and solidification, the melt is formed into multiple filaments. Then, the filaments are bundled, oiled, stretched at high speed (stretch ratio of 3.5), and wound to obtain nylon multifilaments with a specification of 70D / 48f.

[0076] Step 3: Using nylon multifilaments as warp and weft yarns, weave them into a greige fabric on an air-jet loom with a warp density of 50 threads / cm and a weft density of 40 threads / cm. Then, the greige fabric undergoes dyeing and finishing processes to obtain the high-strength UV-resistant tent fabric.

[0077] The method for preparing the nano-reinforcing particles includes the following steps:

[0078] S1. Add 55g of carbon nanotubes to 1L of 15% nitric acid solution and immerse at 35℃ for 1.5h. Then filter, wash and dry. Add 1L of ethanol aqueous solution (ethanol concentration is 75%) and then add 6g of γ-glycidoxypropyltrimethoxysilane. Stir and react at 65℃ for 2.5h. After the reaction is completed, filter, wash and dry to obtain pretreated carbon nanotubes.

[0079] S2. Add 55g of pretreated carbon nanotubes from step S1 to 1L of DMF, then add 6g of 12-aminododecanoic acid, and react at 70℃ for 3.5h under a nitrogen atmosphere. After the reaction is complete, filter, wash and dry to obtain organic carbon nanotubes.

[0080] S3. Add 55g of organic carbon nanotubes from step S2 to 1L of DMF. Under nitrogen protection, add 7g of EDC and 5g of NHS. Stir and activate at 6℃ for 2.5h, then add 3.5g of 3,5-di-tert-butyl-4-hydroxybenzylamine. React at 25℃ for 7h. After the reaction is complete, filter, wash and dry to obtain nano-reinforced particles.

[0081] Compared to Example 1, the nano-reinforcing particles in this comparative example did not introduce 5-aminobenzotriazole.

[0082] Comparative Example 3

[0083] A method for preparing a high-strength UV-resistant tent fabric includes the following steps:

[0084] Step 1: After drying Nylon 6 to a moisture content of less than 0.02%, mix it with nano-reinforcing particles at a mass ratio of 93:7. Then, granulate the mixture using a twin-screw extruder. The temperatures of the twin-screw extruder from the feeding section to the die section are set to 230℃, 240℃, 250℃, 250℃, and 245℃ respectively to obtain high-concentration reinforcing masterbatch.

[0085] Step 2: Mix Nylon 6, high-concentration reinforcing masterbatch, and additives evenly. The mass ratio of Nylon 6, high-concentration reinforcing masterbatch, and additives (antioxidant 445, antioxidant 168, and zinc stearate in a mass ratio of 4:3:3) is 90:10:0.6. Then, add the mixture to a screw-type melt spinning machine. After passing through a filter screen, the melt is extruded through a microporous spinneret to form multiple fine melt streams. After cooling and solidification, the melt is formed into multiple filaments. Then, the filaments are bundled, oiled, stretched at high speed (stretch ratio of 3.5), and wound to obtain nylon multifilaments with a specification of 70D / 48f.

[0086] Step 3: Using nylon multifilaments as warp and weft yarns, weave them into a greige fabric on an air-jet loom with a warp density of 50 threads / cm and a weft density of 40 threads / cm. Then, the greige fabric undergoes dyeing and finishing processes to obtain the high-strength UV-resistant tent fabric.

[0087] The method for preparing the nano-reinforcing particles includes the following steps:

[0088] S1. Add 55g of carbon nanotubes to 1L of 15% nitric acid solution and immerse at 35℃ for 1.5h. Then filter, wash and dry. Add 1L of ethanol aqueous solution (ethanol concentration is 75%) and then add 6g of γ-glycidoxypropyltrimethoxysilane. Stir and react at 65℃ for 2.5h. After the reaction is completed, filter, wash and dry to obtain pretreated carbon nanotubes.

[0089] S2. Add 55g of pretreated carbon nanotubes from step S1 to 1L of DMF, then add 6g of 12-aminododecanoic acid, and react at 70℃ for 3.5h under a nitrogen atmosphere. After the reaction is complete, filter, wash and dry to obtain organic carbon nanotubes.

[0090] S3. Mix 55g of organic carbon nanotubes from step S2 with 2.5g of 5-aminobenzotriazole and 3.5g of 3,5-di-tert-butyl-4-hydroxybenzylamine until homogeneous to obtain nano-reinforced particles.

[0091] Compared with Example 1, the nano-reinforcing particles in this comparative example were obtained by physical blending of organic carbon nanotubes with 5-aminobenzotriazole and 3,5-di-tert-butyl-4-hydroxybenzylamine.

[0092] Comparative Example 4

[0093] A method for preparing a high-strength UV-resistant tent fabric includes the following steps:

[0094] Step 1: After drying Nylon 6 to a moisture content of less than 0.02%, mix it with nano-reinforcing particles at a mass ratio of 93:7. Then, granulate the mixture using a twin-screw extruder. The temperatures of the twin-screw extruder from the feeding section to the die section are set to 230℃, 240℃, 250℃, 250℃, and 245℃ respectively to obtain high-concentration reinforcing masterbatch.

[0095] Step 2: Mix Nylon 6, high-concentration reinforcing masterbatch, and additives evenly. The mass ratio of Nylon 6, high-concentration reinforcing masterbatch, and additives (antioxidant 445, antioxidant 168, and zinc stearate in a mass ratio of 4:3:3) is 90:10:0.6. Then, add the mixture to a screw-type melt spinning machine. After passing through a filter screen, the melt is extruded through a microporous spinneret to form multiple fine melt streams. After cooling and solidification, the melt is formed into multiple filaments. Then, the filaments are bundled, oiled, stretched at high speed (stretch ratio of 3.5), and wound to obtain nylon multifilaments with a specification of 70D / 48f.

[0096] Step 3: Using nylon multifilaments as warp and weft yarns, weave them into a greige fabric on an air-jet loom with a warp density of 50 threads / cm and a weft density of 40 threads / cm. Then, the greige fabric undergoes dyeing and finishing processes to obtain the high-strength UV-resistant tent fabric.

[0097] The method for preparing the nano-reinforcing particles includes the following steps:

[0098] S1. Add 55g of carbon nanotubes to 1L of 15% nitric acid solution and immerse at 35℃ for 1.5h. Then filter, wash and dry. Add 1L of ethanol aqueous solution (ethanol concentration is 75%) and then add 6g of γ-glycidoxypropyltrimethoxysilane. Stir and react at 65℃ for 2.5h. After the reaction is completed, filter, wash and dry to obtain pretreated carbon nanotubes.

[0099] S2. Add 55g of pretreated carbon nanotubes from step S1 to 1L of DMF, then add 2.5g of 5-aminobenzotriazole and 3.5g of 3,5-di-tert-butyl-4-hydroxybenzylamine. React at 70℃ for 3.5h under a nitrogen atmosphere. After the reaction is complete, filter, wash and dry to obtain nano-reinforced particles.

[0100] Compared to Example 1, 12-aminododecanoic acid was not introduced into the nano-reinforcing particles of this comparative example.

[0101] The fabrics prepared in Examples 1-3 and Comparative Examples 1-4 were subjected to performance tests. According to GB / T3916-2013 "Determination of breaking strength and elongation at break of single yarn in packaged textiles", the breaking strength and elongation at break of each group of nylon multifilaments were tested. The UV aging resistance was tested according to GB / T 23987-2009 standard. The irradiation wavelength was 340nm, the temperature was 50℃, and the time was 240h. The breaking strength retention rate and elongation at break of the nylon multifilaments after aging were tested. The test results are shown in Table 1 below.

[0102] Table 1

[0103]

[0104] As can be seen from Table 1 above, the nylon multifilament prepared by this invention has excellent breaking properties and good UV resistance, resulting in a fabric with excellent physical strength and UV resistance.

[0105] The above description is a further detailed explanation of the present invention in conjunction with specific implementation examples. It should not be considered that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, several simple deductions or substitutions can be made without departing from the concept of the present invention, and all such deductions or substitutions should be considered to fall within the protection scope of the present invention.

[0106] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for preparing a high-strength, UV-resistant tent fabric, characterized in that, Includes the following steps: Step 1: Mix Nylon 6 with nano-reinforcing particles and granulate to obtain a high-concentration reinforcing masterbatch; Step 2: Mix Nylon 6, high-concentration reinforcing masterbatch, and additives evenly, perform melt spinning, and then bundle oiling, high-speed stretching, and winding to obtain nylon multifilament; Step 3: Use nylon multifilament as warp and weft yarns to weave into a greige fabric, and then perform dyeing and finishing processes on the greige fabric to obtain the high-strength UV-resistant tent fabric. The method for preparing the nano-reinforcing particles includes the following steps: S1. Carbon nanotubes are added to nitric acid solution, impregnated, filtered, washed and dried, then added to ethanol aqueous solution, followed by γ-glycidoxypropyltrimethoxysilane, and stirred to obtain pretreated carbon nanotubes. S2. Add the pretreated carbon nanotubes to DMF, then add 12-aminododecanoic acid, and heat to react to obtain organic carbon nanotubes. S3. Organic carbon nanotubes are added to DMF. Under nitrogen protection, EDC and NHS are added. After stirring and activation, 5-aminobenzotriazole is added and the reaction is carried out at a constant temperature. After the preset time is reached, 3,5-di-tert-butyl-4-hydroxybenzylamine is added and the reaction is continued for 6-8 hours to obtain nano-reinforced particles.

2. The preparation method according to claim 1, characterized in that, In step one, the mass ratio of nylon 6 to nano-reinforcing particles is 92-95:5-8, and the granulation temperature is 230-250℃.

3. The preparation method according to claim 1, characterized in that, In step two, the mass ratio of nylon 6, high-concentration reinforcing masterbatch, and additives is 88-92:8-12:0.4-0.7; the additives consist of antioxidant 445, antioxidant 168, and zinc stearate in a mass ratio of 3-5:2-3:2-3; the draw ratio of the high-speed stretching is 3-4; and the specifications of the nylon multifilament are 70D / 48f or 80D / 68f.

4. The preparation method according to claim 1, characterized in that, The warp density of the weaving described in step three is 45-55 threads / cm, and the weft density is 35-45 threads / cm.

5. The preparation method according to claim 1, characterized in that, In step S1, the mass concentration of the nitric acid solution is 10-15%, the immersion temperature is 30-40℃, and the immersion time is 1-2 hours.

6. The preparation method according to claim 1, characterized in that, In step S1, the ethanol aqueous solution has a mass concentration of 70-80%, the mass ratio of carbon nanotubes to γ-glycidoxypropyltrimethoxysilane is 50-60:4-7, the stirring reaction temperature is 60-70℃, and the time is 2-3h.

7. The preparation method according to claim 1, characterized in that, In step S2, the mass ratio of pretreated carbon nanotubes to 12-aminododecanoic acid is 50-60:4-7, and the heating reaction temperature is 60-80℃ for 3-4 hours.

8. The preparation method according to claim 1, characterized in that, In step S3, the mass ratio of organic carbon nanotubes, EDC, NHS, 5-aminobenzotriazole, and 3,5-di-tert-butyl-4-hydroxybenzylamine is 50-60:6-8:4-6:2-3:2.5-4; the stirring activation temperature is 4-8℃ and the time is 2-3h; the isothermal reaction temperature is 20-30℃ and the preset time is 6-8h.

9. A high-strength UV-resistant tent fabric prepared by the method according to any one of claims 1-8.

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