Coating process of low elastic filament and high elastic filament

Abstract

This application discloses a coating process for low-elasticity yarn and high-elasticity yarn, including the following steps: Nylon high-elasticity yarn is immersed in a sodium chloride solution for 30-45 minutes, then sequentially immersed in ethylene glycol and a surfactant, washed with water until neutral, and dried to obtain treated high-elasticity yarn; Polyester low-elasticity yarn is immersed in a sodium hydroxide solution for activation treatment for 25-35 minutes at a temperature of 35-45°C, then immersed in a modifier, washed with water, and dried to obtain treated low-elasticity yarn; Using high-elasticity yarn as the core yarn, the low-elasticity yarn is used to coat the core yarn to obtain a composite yarn; the modifier includes the following raw materials: vinyl acetate, modified montmorillonite, graphene-modified fiber, polyvinylpyrrolidone, ethanol, seaweed fiber, and ethylenediamine. The composite yarn prepared by this application has good mechanical properties and moisture absorption and release properties, and subsequently exhibits good breathability when applied to fabrics.

Description

Technical Field

[0001] This application relates to the field of functional fiber technology, and in particular to the coating process of low-elasticity yarns and high-elasticity yarns. Background Technology

[0002] High-elasticity yarn and low-elasticity yarn are generally made from polyester. Due to different processing during the texturing process, they produce finished products with different elasticity. High-elasticity yarn and low-elasticity yarn are commonly used in the production of various elastic pants, elastic stockings and other products, and have a wide range of applications.

[0003] High-elasticity yarn has the advantages of being easy to dye, having low static electricity, good abrasion resistance, as well as excellent softness and elastic recovery, good wrinkle resistance and dimensional stability. Fabrics made from it have a high elastic stretch rate. Low-elasticity yarn, on the other hand, has certain heat resistance and corrosion resistance, is not easily damaged during washing, and is easy to wash and quick-drying. Composite elastic yarn is prepared by combining high-elasticity and low-elasticity yarns. The prepared elastic yarn has the advantages of both high-elasticity and low-elasticity yarns. However, low-elasticity yarn has the disadvantage of poor moisture absorption. After being made into fabric, it feels stuffy and not breathable when worn, which affects the wearer's comfort. Summary of the Invention

[0004] To improve the poor moisture absorption of low-elasticity yarn, this application provides a coating process for low-elasticity yarn and high-elasticity yarn.

[0005] This application provides a coating process for low-elasticity yarns and high-elasticity yarns, using the following technical solution: The coating process between low-elasticity yarns and high-elasticity yarns includes the following steps: (1) Soak nylon high elastic yarn in sodium chloride solution for 30-45 minutes, then soak it in ethylene glycol and surfactant in sequence, wash it with water until neutral, and dry it to obtain the treated high elastic yarn; (2) The polyester low elastic yarn is immersed in sodium hydroxide solution for activation treatment. The activation treatment time is 25-35 min and the activation treatment temperature is 35-45℃. Then it is immersed in the modifier, washed with water, and dried to obtain the treated low elastic yarn. (3) Using high-elasticity yarn as the core yarn and covering the core yarn with low-elasticity yarn, a composite yarn is obtained; The modifier includes the following raw materials: vinyl acetate, modified montmorillonite, graphene-modified fiber, polyvinylpyrrolidone, ethanol, seaweed fiber, and ethylenediamine.

[0006] By adopting the above technical solution, nylon high-elastic yarn is soaked in sodium chloride solution to remove organic impurities and kill bacteria, thereby increasing the surface tension of the nylon high-elastic yarn. Then, ethylene glycol is added. Ethylene glycol has hygroscopic, lubricating and thickening properties, which increases the hygroscopicity of the nylon high-elastic yarn. The surfactant, in combination with ethylene glycol, further increases the wetting effect of the nylon high-elastic yarn, which helps to make the fabric in the later stage and increases the moisture absorption of the fabric.

[0007] Polyester low-elasticity yarn is soaked in sodium hydroxide solution. Sodium hydroxide has an abrasive effect on the outer surface of the nylon low-elasticity yarn, making the outer surface of the nylon low-elasticity yarn rough and forming a microporous structure. Then, a modifier is added to treat the polyester low-elasticity yarn to increase its moisture absorption and mechanical properties.

[0008] Modified montmorillonite in the modifier has a strong hygroscopic effect, improving the hygroscopic performance of polyester low-elasticity yarn. Graphene-modified fiber has good antibacterial and bacteriostatic properties, antistatic properties, moisture absorption and breathability, and UV protection properties. Montmorillonite has a layered structure, and graphene-modified fiber can be loaded on the surface and layered structure of montmorillonite, increasing the interlayer spacing of montmorillonite, thereby increasing the specific surface area of ​​montmorillonite and enhancing its adsorption performance. This helps montmorillonite adsorb onto the surface and microporous structure of polyester low-elasticity yarn. Algae fiber is not only soft but also has the advantages of moisture absorption, perspiration wicking, and breathability, and also has its own antibacterial and bacteriostatic effects. Algae fiber and graphene-modified fiber are intertwined and jointly loaded in the layered structure of montmorillonite, which further helps montmorillonite to be loaded onto polyester low-elasticity yarn. At the same time, montmorillonite has good dispersion properties, which further helps the components to be dispersed evenly, and helps to further exert the effect of the modifier, increasing the hygroscopic and mechanical properties of polyester low-elasticity yarn.

[0009] Preferably, the modifier comprises, by weight, the following raw materials: 20-38 parts vinyl acetate, 10-15 parts modified montmorillonite, 8-12 parts graphene-modified fiber, 3-8 parts polyvinylpyrrolidone, 30-45 parts ethanol, 5-9 parts seaweed fiber, and 12-18 parts ethylenediamine.

[0010] By adopting the above technical solution and further limiting the amount of each component, a modifier with better overall performance is obtained, which helps to obtain polyester low-elasticity yarn with better moisture absorption and mechanical properties, thereby helping to improve the moisture absorption performance of the fabric. There is a synergistic effect between modified montmorillonite, graphene modified fiber and seaweed fiber. Graphene modified fiber and seaweed fiber are intertwined and jointly loaded on the sheet structure or surface of modified montmorillonite, increasing the mechanical properties and moisture absorption of modified montmorillonite, thereby helping to improve the overall performance of polyester low-elasticity yarn.

[0011] Preferably, the preparation method of the modified montmorillonite includes the following steps: (1) Calcine montmorillonite at 350-450℃ for 10-16h, then add sulfuric acid with a concentration of 18-22wt% for 2-4h activation, wash with water and dry to obtain pretreated montmorillonite; (2) Disperse the pretreated montmorillonite obtained in step (1) in ethanol, stir for 1-2 hours, then add porous nano TiO2 and tea polyphenols, and continue stirring for 3-5 hours for later use; (3) Add sodium alginate and dispersant to the montmorillonite treated in step (2), continue stirring for 5-9 hours, and dry to obtain modified montmorillonite.

[0012] By adopting the above technical solution, montmorillonite is calcined at high temperature to remove organic impurities and increase the interlamellar spacing, which helps to increase the surface area of ​​montmorillonite. Then, sulfuric acid is added to further remove organic impurities from montmorillonite and increase its activity, which helps to load subsequent substances.

[0013] Porous nano-TiO2 has extremely high surface activity, possessing bactericidal, deodorizing, and stain-resistant properties. When loaded into the porous structure of montmorillonite, nano-TiO2 increases the surface area of ​​the montmorillonite. Simultaneously, porous nano-TiO2 exhibits excellent capillary moisture-wicking properties, enabling the timely removal of sweat and other liquids from the fabric, thus aiding in subsequent fabric drying. Tea polyphenols possess antibacterial and bactericidal effects, helping to maintain the antibacterial and bactericidal properties of polyester low-elasticity yarn. When subsequently applied to fabrics, they enhance the fabric's antibacterial performance. Furthermore, tea polyphenols improve the fabric's moisture absorption and breathability, enabling rapid sweat wicking. When tea polyphenols and porous nano-TiO2 are used in combination, they can quickly remove odors from the fabric and maintain a long-lasting deodorizing effect.

[0014] Sodium alginate has a certain viscosity and can be used as a stabilizer and thickener. The addition of sodium alginate allows more porous nano-TiO2 to be loaded in montmorillonite, increasing the viscosity of the system. This helps tea polyphenols to adhere to the surface of montmorillonite for a long time, increasing the antibacterial durability and air permeability of montmorillonite. The dispersant helps the components to be dispersed evenly, reducing the probability of porous nano-TiO2 agglomeration, and further helping to increase the moisture absorption and air permeability of montmorillonite.

[0015] Preferably, the mass ratio of montmorillonite, porous nano-TiO2 and tea polyphenols is 1:0.3-0.6:0.1-0.5.

[0016] By adopting the above technical solution and controlling the mass ratio of montmorillonite, porous nano-TiO2 and tea polyphenols within a certain range, modified montmorillonite with excellent moisture absorption and breathability is obtained. Montmorillonite, porous nano-TiO2 and tea polyphenols have a synergistic effect, which together improves the moisture absorption, breathability and antibacterial properties of montmorillonite, which helps to improve the moisture absorption and breathability of polyester low elastic yarn in the subsequent process, thereby improving the breathability of the fabric.

[0017] Preferably, the dispersant is one or more of hydroxypropyl methylcellulose, cyanoethyl cellulose, and carboxymethyl hydroxyethyl cellulose.

[0018] By adopting the above technical solutions, dispersants help to increase the dispersion performance of the system, reduce the time and energy required for the dispersion process, stabilize the structure of the system components, modify the surface properties of the system components, and help the components in the system to be dispersed uniformly.

[0019] Preferably, the method for preparing the graphene-modified fiber includes the following steps: (1) Disperse bamboo charcoal fiber in sodium hydroxide solution and stir for 1-3 hours, wash with water, then add nanocrystalline cellulose and continue stirring for 2-5 hours, then set aside. (2) Graphene is dispersed in ethanol, nano-silica and hydroxymethyl chitosan are added, and the mixture is stirred at 70-80℃ for 2-4 hours for later use. (3) Mix the bamboo charcoal fiber modified in step (1) and the modified graphene obtained in step (2), and add a coupling agent to obtain graphene modified fiber.

[0020] By adopting the above technical solution, bamboo charcoal fiber has strong adsorption capacity and moisture absorption and breathability. Bamboo charcoal fiber is soaked in sodium hydroxide, which has a certain erosion effect on the outer surface of bamboo charcoal fiber, increasing the surface roughness of bamboo charcoal fiber, thereby increasing the specific surface area of ​​bamboo charcoal fiber, which helps the loading of nanocrystalline cellulose. Nanocrystalline cellulose has biodegradability, biocompatibility and mechanical strength, thereby increasing the mechanical strength of bamboo charcoal fiber.

[0021] Graphene possesses strong antibacterial and bacteriostatic properties, mechanical strength, and moisture absorption and breathability. Nano-silica, with hydroxyl groups and adsorbed water on its surface, is characterized by small particle size, high purity, low density, large specific surface area, and good dispersion, as well as optical properties that resist ultraviolet radiation. It can improve the material's anti-aging, strength, and chemical resistance. Nano-silica loaded on the surface of graphene further enhances the mechanical properties of graphene. Hydroxymethyl chitosan has certain viscosity and antibacterial properties. The addition of hydroxymethyl chitosan allows more nano-silica to be loaded in graphene and further increases the viscosity between nano-silica and graphene, further improving the overall performance of graphene.

[0022] Preferably, the mass ratio of bamboo charcoal fiber, graphene and nano-silica is 0.5-0.9g:1mg:0.1-0.4g.

[0023] By adopting the above technical solution and controlling the mass ratio of bamboo charcoal fiber, graphene, and nano-silica particles within a certain range, graphene-modified fibers with excellent moisture absorption, breathability, and mechanical properties are obtained. Bamboo charcoal fiber, graphene, and nano-silica particles have a synergistic effect, jointly improving the mechanical properties, moisture absorption, breathability, and antibacterial properties of graphene-modified fibers. This helps to improve the overall properties of polyester low-elasticity yarn, such as moisture absorption and breathability, and thus improve the overall properties of the fabric, such as breathability.

[0024] Preferably, the coupling agent is one or a combination of several of polyethylene glycol, polyvinyl alcohol, and epichlorohydrin.

[0025] By adopting the above technical solution, the addition of coupling agent is used to improve the surface properties of the system, reduce the viscosity and dispersion of the system, and improve the processability of subsequent materials.

[0026] Preferably, the surfactant is one or more of sodium dioctyl succinate, sodium dodecylbenzene sulfonate, and stearic acid.

[0027] By adopting the above technical solution, surfactants can increase the emulsification effect of the system, which helps the components in the system to mix fully and work together.

[0028] Preferably, in step (1), the soaking temperature is 60-80℃ and the soaking time is 20-30min.

[0029] By adopting the above technical solutions and setting appropriate soaking temperatures and times, it is helpful to obtain a uniformly mixed raw material system.

[0030] In summary, this application has the following beneficial effects: 1. In this application, nylon high-elastic yarn is soaked in sodium chloride solution to remove organic impurities and kill bacteria, thereby increasing the surface tension of the nylon high-elastic yarn. Then, ethylene glycol is added. Ethylene glycol has hygroscopic, lubricating and thickening properties, which increases the hygroscopicity of the nylon high-elastic yarn. The surfactant, in combination with ethylene glycol, further increases the wetting effect of the nylon high-elastic yarn, which helps to make the fabric in the subsequent process and increases the moisture absorption of the fabric.

[0031] 2. In this application, the polyester low-elasticity yarn is soaked in sodium hydroxide solution. Sodium hydroxide has an abrasive effect on the outer surface of the nylon low-elasticity yarn, making the outer surface of the nylon low-elasticity yarn rough and forming a microporous structure. Then, a modifier is added to treat the polyester low-elasticity yarn to increase its hygroscopicity and mechanical properties.

[0032] 3. In this application, the modified montmorillonite in the modifier has a strong hygroscopic effect, which improves the hygroscopic performance of polyester low-elasticity yarn. The graphene modified fiber has good antibacterial and bacteriostatic properties, antistatic properties, moisture absorption and breathability, and UV protection properties. Montmorillonite has a layered structure, and the graphene modified fiber can be loaded on the surface and in the layered structure of montmorillonite, which can increase the interlayer spacing of montmorillonite, thereby increasing the specific surface area of ​​montmorillonite and enhancing the adsorption performance. This helps montmorillonite to be adsorbed on the surface and microporous structure of polyester low-elasticity yarn. The seaweed fiber is not only soft, but also has the advantages of moisture absorption, perspiration wicking and breathability, and also has its own antibacterial and bacteriostatic effect. The seaweed fiber and the graphene modified fiber are intertwined and jointly loaded in the layered structure of montmorillonite, which increases the hygroscopic performance and mechanical properties of polyester low-elasticity yarn. Detailed Implementation

[0033] The present application will be further described in detail below with reference to the embodiments.

[0034] The raw materials used in the examples and comparative examples are all commercially available. The dispersant is hydroxypropyl methylcellulose, the coupling agent is polyethylene glycol, and the surfactant is sodium dioctyl succinate sulfonate.

[0035] Preparation example of nano-bentonite Preparation Example 1-1 The preparation method of modified montmorillonite includes the following steps: (1) 1.2 kg of montmorillonite was calcined at 400℃ for 14 h, and then 2 L of 20 wt% sulfuric acid was added for activation for 3 h. After washing with water and drying, pretreated montmorillonite was obtained. (2) Disperse the pretreated montmorillonite obtained in step (1) in 2.2L of ethanol, stir for 2h, then add porous nano TiO2 and tea polyphenols, and continue stirring for 4h for later use; (3) Add 0.5 kg of sodium alginate and 0.1 kg of dispersant to the montmorillonite treated in step (2), continue stirring for 7 h, and dry to obtain modified montmorillonite, wherein the mass ratio of montmorillonite, porous nano TiO2 and tea polyphenols is 1:0.3:0.1.

[0036] Preparation Examples 1-2 The difference from preparation example 1-1 is that porous nano-TiO2 is not added in step (2).

[0037] Preparation Examples 1-3 The difference from preparation example 1-1 is that tea polyphenols are not added in step (2).

[0038] Preparation Examples 1-4 The difference from Preparation Example 1-1 is that sodium alginate is not added in step (2).

[0039] Preparation Examples 1-5 The difference from Preparation Example 1-1 is that the mass ratio of montmorillonite, porous nano-TiO2 and tea polyphenols is 1:0.6:0.5.

[0040] Preparation Examples 1-6 The difference from Preparation Example 1-1 is that the mass ratio of montmorillonite, porous nano-TiO2 and tea polyphenols is 1:0.8:0.9.

[0041] Preparation example of modified graphene Preparation Example 2-1 The preparation method of graphene-modified fibers includes the following steps: (1) Disperse bamboo charcoal fiber in 2L of sodium hydroxide solution with a mass concentration of 20% and stir for 3 hours. Wash with water, then add 0.3kg of nanocrystalline cellulose and continue stirring for 4 hours. Set aside for later use. (2) Disperse 1 mg of graphene in 0.5 L of ethanol, add nano-silica and 0.3 kg of hydroxymethyl chitosan, stir at 75 °C for 3 h, and set aside. (3) Mix the bamboo charcoal fiber modified in step (1) and the modified graphene obtained in step (2), and add 0.01 kg of coupling agent to obtain graphene modified fiber, wherein the mass ratio of bamboo charcoal fiber, graphene and nano silica is 0.9 g: 1 mg: 0.1 g.

[0042] Preparation Example 2-2 The difference from preparation example 2-1 is that no nano-silica is added in step (2).

[0043] Preparation Examples 2-3 The difference from preparation example 2-1 is that hydroxymethyl chitosan is not added in step (2).

[0044] Preparation Examples 2-4 The difference from preparation example 2-1 is that step (1) is not performed.

[0045] Preparation Examples 2-5 The difference from Preparation Example 2-1 is that the mass ratio of bamboo charcoal fiber, graphene and nano silica is 0.5g:1mg:0.4g.

[0046] Preparation Examples 2-6 The difference from Preparation Example 2-1 is that the mass ratio of bamboo charcoal fiber, graphene and nano silica is 0.3g:1mg:0.7g. Example

[0047] Example 1 The coating process between low-elasticity yarns and high-elasticity yarns includes the following steps: (1) Immerse 1 kg of nylon high elastic yarn in 2 L of sodium chloride solution with a mass concentration of 45% for 40 min, then immerse it in 1.5 L of ethylene glycol and 1.2 L of surfactant in sequence, wash it with water until neutral, and dry it to obtain the treated high elastic yarn. (2) 1.5 kg of polyester low elastic yarn was immersed in 2 L of sodium hydroxide solution with a mass fraction of 15% for activation treatment. The activation treatment time was 30 min and the activation treatment temperature was 40℃. Then it was immersed in the modifier, washed with water, and dried to obtain the treated low elastic yarn. (3) Using high-elasticity yarn as the core yarn and covering the core yarn with low-elasticity yarn, a composite yarn is obtained; The modifier, by weight, includes the following raw materials: 30 kg vinyl acetate, 12 kg modified montmorillonite, 10 kg graphene-modified fiber, 5 kg polyvinylpyrrolidone, 38 kg ethanol, 7 kg seaweed fiber, and 15 kg ethylenediamine. Modified montmorillonite was prepared using Preparation Example 1-1; graphene-modified fibers were prepared using Preparation Example 2-1.

[0048] Example 2 The coating process for low-elasticity and high-elasticity yarns differs from that in Example 1 in that the modified montmorillonite is prepared using Preparation Examples 1-2.

[0049] Example 3 The coating process for low-elasticity and high-elasticity yarns differs from that in Example 1 in that the modified montmorillonite is prepared using Preparation Examples 1-3.

[0050] Example 4 The coating process for low-elasticity and high-elasticity yarns differs from that in Example 1 in that the modified montmorillonite is prepared using Preparation Examples 1-4.

[0051] Example 5 The coating process for low-elasticity and high-elasticity yarns differs from that in Example 1 in that the modified montmorillonite is prepared using Preparation Examples 1-5.

[0052] Example 6 The coating process for low-elasticity and high-elasticity yarns differs from that in Example 1 in that the modified montmorillonite is prepared using Preparation Examples 1-6.

[0053] Example 7 The coating process for low-elasticity and high-elasticity fibers differs from that in Example 1 in that the graphene-modified fibers are prepared using Preparation Example 2-2.

[0054] Example 8 The coating process for low-elasticity and high-elasticity fibers differs from that in Example 1 in that the graphene-modified fibers are prepared using Preparation Examples 2-3.

[0055] Example 9 The coating process for low-elasticity and high-elasticity fibers differs from that in Example 1 in that the graphene-modified fibers are prepared using Preparation Examples 2-4.

[0056] Example 10 The coating process for low-elasticity and high-elasticity fibers differs from that in Example 1 in that the graphene-modified fibers are prepared using Preparation Examples 2-5.

[0057] Example 11 The coating process for low-elasticity and high-elasticity fibers differs from that in Example 1 in that the graphene-modified fibers are prepared using Preparation Examples 2-6.

[0058] Example 12 The coating process for low-elasticity and high-elasticity yarns differs from that in Example 1 in that the modifier, by weight, includes the following raw materials: 38 kg vinyl acetate, 15 kg modified montmorillonite, 12 kg graphene-modified fiber, 3 kg polyvinylpyrrolidone, 30 kg ethanol, 5 kg seaweed fiber, and 12 kg ethylenediamine.

[0059] Example 13 The coating process for low-elasticity and high-elasticity yarns differs from that in Example 1 in that the modifier, by weight, includes the following raw materials: 20 kg vinyl acetate, 10 kg modified montmorillonite, 8 kg graphene-modified fiber, 8 kg polyvinylpyrrolidone, 45 kg ethanol, 9 kg seaweed fiber, and 18 kg ethylenediamine.

[0060] Example 14 The coating process for low-elasticity and high-elasticity yarns differs from that in Example 1 in that the modifier, by weight, includes the following raw materials: 15 kg vinyl acetate, 8 kg modified montmorillonite, 6 kg graphene-modified fiber, 1 kg polyvinylpyrrolidone, 25 kg ethanol, 3 kg seaweed fiber, and 10 kg ethylenediamine.

[0061] Example 15 The coating process for low-elasticity and high-elasticity yarns differs from that in Example 1 in that the modifier, by weight, includes the following raw materials: 42 kg vinyl acetate, 18 kg modified montmorillonite, 15 kg graphene-modified fiber, 12 kg polyvinylpyrrolidone, 50 kg ethanol, 12 kg seaweed fiber, and 22 kg ethylenediamine.

[0062] Comparative Example Comparative Example 1 The coating process for low-elasticity and high-elasticity yarns differs from that in Example 1 in that modified montmorillonite is not added.

[0063] Comparative Example 2 The coating process for low-elasticity and high-elasticity yarns differs from that in Example 1 in that an equal amount of montmorillonite is used instead of modified montmorillonite.

[0064] Comparative Example 3 The coating process for low-elasticity and high-elasticity fibers differs from that in Example 1 in that graphene-modified fibers are not added.

[0065] Comparative Example 4 The coating process for low-elasticity and high-elasticity yarns differs from that in Example 1 in that an equal amount of graphene is used instead of graphene-modified fibers.

[0066] Comparative Example 5 The coating process for low-elasticity and high-elasticity yarns differs from that in Example 1 in that seaweed fiber is not added.

[0067] Performance testing The composite yarns prepared in Examples 1-15 and Comparative Examples 1-5 were tested for mechanical properties and moisture absorption and breathability. The tensile strength was tested according to GB / T14337-2022, and the elongation at break was tested according to GB / T9997-1988. The elongation at break of the composite yarns with an initial sample length of 30 mm and a tensile speed of 300 mm / min was measured using an automatic tensile tester. Test of moisture absorption and release rate of the sample: The sample was dried at 100℃ to constant weight and weighed W0; then placed at 25℃×55%RH for 24 hours and weighed W1; the sample was then transferred to 35℃×90%RH for 40 minutes and weighed W2; the sample was placed at 40℃×85%RH for 24 hours and weighed W3; the sample was then transferred to 25℃×55%RH for 40 minutes and weighed W4. The moisture absorption and release rate was calculated using the following formula: Moisture absorption rate (%) = [(W2-W1) / W0] × 100; Moisture release rate (%) = [(W3-W4) / W0]×100; The results are shown in Table 1.

[0068] Table 1 Test data for the examples and comparative examples As can be seen from Table 1, the composite yarns prepared in Examples 1, 5, 10 and 12-13 of this application have good mechanical properties and moisture absorption and release properties. The tensile strength reaches 89 MPa, the elongation at break reaches 450%, the moisture absorption rate reaches 5.3%, and the moisture release rate reaches 7.1%. This indicates that the composite yarns prepared by the process of this application have excellent mechanical properties and moisture absorption and release properties. When subsequently used in the preparation of fabrics, they have good breathability and contribute to wearing comfort.

[0069] Example 2 modified montmorillonite without the addition of porous nano-TiO2, Example 3 modified montmorillonite without the addition of tea polyphenols, and Example 4 modified montmorillonite without the addition of sodium alginate. Table 1 shows that the tensile strength is approximately 81 MPa, the elongation at break is approximately 438%, the moisture absorption rate is approximately 4.7%, and the moisture release rate is approximately 6.3%. This indicates that TiO2 loading in the porous structure of montmorillonite increases its mechanical properties. Simultaneously, porous nano-TiO2 has excellent capillary moisture-wicking properties, enabling timely removal of sweat and other liquids from the fabric, increasing the breathability of the low-elasticity yarn. Tea polyphenols not only have good antibacterial properties but also enhance the moisture absorption and breathability of the low-elasticity yarn, allowing for rapid perspiration wicking. The addition of sodium alginate increases the loading of porous nano-TiO2 in the montmorillonite, increasing the viscosity of the system and facilitating the long-lasting adhesion of tea polyphenols to the surface of the montmorillonite, thus increasing the antibacterial durability and breathability of the montmorillonite.

[0070] Example 6 altered the mass ratio of montmorillonite, porous nano-TiO2, and tea polyphenols. Compared to Examples 1-5, the mechanical properties and moisture absorption and release properties of the prepared composite yarn were better than those of Examples 2-3, but worse than those of Examples 1 and 5. This indicates that montmorillonite, porous nano-TiO2, and tea polyphenols have a synergistic effect, jointly improving the moisture absorption, breathability, and antibacterial properties of montmorillonite, which helps to improve the moisture absorption and breathability of polyester low-elasticity yarn, thereby improving the breathability of the fabric.

[0071] Example 7: Graphene-modified fibers without the addition of nano-silica; Example 8: Graphene-modified fibers without the addition of hydroxymethyl chitosan. As shown in Table 1, the tensile strength is approximately 78 MPa, the elongation at break is approximately 432%, the moisture absorption rate is approximately 4.5%, and the moisture release rate is approximately 6.1%. This indicates that nano-silica is loaded on the surface of graphene, thereby enhancing the mechanical properties of graphene. The addition of hydroxymethyl chitosan allows more nano-silica to be loaded in graphene and further increases the adhesion between nano-silica and graphene, further improving the overall mechanical properties, moisture absorption, and other properties of graphene.

[0072] Example 9: Graphene-modified fiber without bamboo charcoal fiber. As shown in Table 1, the tensile strength is 69 MPa, the elongation at break is 438%, the moisture absorption rate is 4.2%, and the moisture release rate is 5.1%. This indicates that bamboo charcoal fiber has strong adsorption, moisture absorption and breathability, which can enhance the mechanical properties and moisture absorption and breathability of graphene.

[0073] Example 11 altered the mass ratio of bamboo charcoal fiber, graphene, and nano-silica particles. Compared to Examples 1 and 7-10, the mechanical properties and moisture absorption and release properties of the prepared composite yarn were better than those of Examples 7-8, but worse than those of Examples 1 and 10. This indicates that bamboo charcoal fiber, graphene, and nano-silica particles have a synergistic effect, jointly improving the mechanical properties, moisture absorption and breathability, and antibacterial properties of graphene-modified fiber. This helps to subsequently improve the overall properties of polyester low-elasticity yarn, such as moisture absorption and breathability, thereby improving the overall properties of the fabric, such as breathability.

[0074] Examples 14-15 show changes in the amount of raw material components of the modifier. As shown in Table 1, compared to Example 1, the tensile strength is approximately 82 MPa, the elongation at break is approximately 432%, the moisture absorption rate is approximately 4.4%, and the moisture release rate is approximately 5.9%. The tensile strength, elongation at break, and moisture absorption and release rates all decreased significantly, indicating that the composite yarn has good mechanical strength, antibacterial properties, and breathability when the raw material components are mixed in a certain proportion. Changes in the amount of each raw material affect the comprehensive properties of the composite yarn, such as mechanical properties and moisture absorption and release.

[0075] In Comparative Example 1, no modified montmorillonite was added to the modifier. As shown in Table 1, the tensile strength was 65 MPa, the elongation at break was 320%, the moisture absorption rate was 3.5%, and the moisture release rate was 4.6%, indicating that the modified montmorillonite has a strong moisture absorption effect and improves the moisture absorption performance of polyester low-elasticity yarn. In Comparative Example 2, an equal amount of montmorillonite was used to replace the modified montmorillonite. Data testing showed that the tensile strength was 80 MPa, the elongation at break was 425%, the moisture absorption rate was 4.6%, and the moisture release rate was 6.5%, indicating that the montmorillonite prepared in this application has good moisture absorption performance, which helps to improve the moisture absorption performance of low-elasticity yarn in the future.

[0076] In Comparative Example 3, no graphene-modified fibers were added to the modifier. Table 1 shows that the tensile strength was 62 MPa, the elongation at break was 310%, the moisture absorption rate was 3.2%, and the moisture release rate was 4.3%. This indicates that the graphene-modified fibers can be loaded on the surface and layered structure of montmorillonite, increasing the specific surface area of ​​montmorillonite and thus enhancing its adsorption performance. This helps montmorillonite adsorb onto the surface and microporous structure of polyester low-elasticity yarn, which is beneficial for the subsequent improvement of the low-elasticity yarn's performance. In Comparative Example 4, an equal amount of graphene was used to replace the graphene-modified fibers. Data testing showed that the tensile strength was 83 MPa, the elongation at break was 428%, the moisture absorption rate was 4.8%, and the moisture release rate was 6.8%. This indicates that the graphene-modified fibers prepared in this application have good moisture absorption performance, which is helpful for improving the moisture absorption performance of the low-elasticity yarn.

[0077] In Comparative Example 5, without the addition of seaweed fiber, Table 1 shows that the tensile strength is 75 MPa, the elongation at break is 435%, the moisture absorption rate is 4.2%, and the moisture release rate is 5.3%. This indicates that the seaweed fiber and the graphene-modified fiber are intertwined and jointly loaded in the montmorillonite sheet structure, which helps the montmorillonite to be loaded on the polyester low-elasticity yarn, further enhancing the mechanical properties and moisture absorption and permeability of the low-elasticity yarn.

[0078] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A coating process for low-elasticity yarn and high-elasticity yarn, characterized in that, Includes the following steps: (1) Soak nylon high elastic yarn in sodium chloride solution for 30-45 minutes, then soak it in ethylene glycol and surfactant in sequence, wash it with water until neutral, and dry it to obtain the treated high elastic yarn; (2) The polyester low elastic yarn is immersed in sodium hydroxide solution for activation treatment. The activation treatment time is 25-35 min and the activation treatment temperature is 35-45℃. Then it is immersed in the modifier, washed with water, and dried to obtain the treated low elastic yarn. (3) Using high-elasticity yarn as the core yarn and covering the core yarn with low-elasticity yarn, a composite yarn is obtained; The modifier includes the following raw materials: vinyl acetate, modified montmorillonite, graphene-modified fiber, polyvinylpyrrolidone, ethanol, seaweed fiber, and ethylenediamine; The preparation method of the modified montmorillonite includes the following steps: (1) Calcine montmorillonite at 350-450℃ for 10-16h, then add sulfuric acid with a concentration of 18-22wt% for 2-4h, wash with water and dry to obtain pretreated montmorillonite; (2) Disperse the pretreated montmorillonite obtained in step (1) in ethanol, stir for 1-2 h, then add porous nano TiO2 and tea polyphenols, and continue stirring for 3-5 h, and set aside; (3) Add sodium alginate and dispersant to the montmorillonite treated in step (2), continue stirring for 5-9 hours, and dry to obtain modified montmorillonite; The method for preparing the graphene-modified fiber includes the following steps: (1) Disperse bamboo charcoal fiber in sodium hydroxide solution and stir for 1-3 hours, wash with water, then add nanocrystalline cellulose and continue stirring for 2-5 hours, then set aside. (2) Graphene is dispersed in ethanol, nano-silica and hydroxymethyl chitosan are added, and stirred at 70-80℃ for 2-4 hours for later use; (3) Mix the bamboo charcoal fiber modified in step (1) and the modified graphene obtained in step (2), add a coupling agent, and obtain graphene modified fiber.

2. The coating process of low-elasticity yarn and high-elasticity yarn according to claim 1, characterized in that, The modifier comprises, by weight, the following raw materials: 20-38 parts vinyl acetate, 10-15 parts modified montmorillonite, 8-12 parts graphene modified fiber, 3-8 parts polyvinylpyrrolidone, 30-45 parts ethanol, 5-9 parts seaweed fiber, and 12-18 parts ethylenediamine.

3. The coating process of low-elasticity yarn and high-elasticity yarn according to claim 1, characterized in that, The mass ratio of montmorillonite, porous nano-TiO2, and tea polyphenols is 1:0.3-0.6:0.1-0.

5.

4. The coating process of low-elasticity yarn and high-elasticity yarn according to claim 1, characterized in that, The dispersant is one or more of hydroxypropyl methylcellulose, cyanoethyl cellulose, and carboxymethyl hydroxyethyl cellulose.

5. The coating process of low-elasticity yarn and high-elasticity yarn according to claim 1, characterized in that, The mass ratio of bamboo charcoal fiber, graphene, and nano-silica is 0.5-0.9g: 1mg: 0.1-0.4g.

6. The coating process of low-elasticity yarn and high-elasticity yarn according to claim 1, characterized in that, The coupling agent is one or a combination of several of polyethylene glycol, polyvinyl alcohol, and epichlorohydrin.

7. The coating process of low-elasticity yarn and high-elasticity yarn according to claim 1, characterized in that, The surfactant is one or more of sodium dioctyl succinate, sodium dodecylbenzene sulfonate, and stearic acid.

8. The coating process of low-elasticity yarn and high-elasticity yarn according to claim 1, characterized in that, In step (1), the soaking temperature is 60-80℃ and the soaking time is 20-30min.

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