A method for producing a waterproof polyamide yarn

Abstract

The present application relates to the technical field of textiles, and particularly relates to a production method of waterproof nylon yarn. The production method of waterproof nylon yarn comprises the following steps: sequentially performing plasma treatment and silane coupling agent modification on nylon filaments to obtain modified nylon filaments; mixing the modified nylon filaments and polyester elastic filaments, and sequentially performing combining, twisting and network processing to obtain composite filaments; soaking the composite filaments in a fluorine-free composite waterproof finishing liquid to perform finishing to obtain waterproof filaments; and sequentially performing first solidification and second solidification on the waterproof filaments to obtain waterproof nylon yarn after post-processing. The present application constructs a complete process system comprising fiber surface synergistic modification, yarn structure optimization, multifunctional fluorine-free composite finishing and gradient solidification crosslinking, and finally obtains high-quality waterproof nylon yarn which is environmentally friendly, has excellent waterproof performance, excellent mechanical properties and soft hand feeling.

Description

Technical Field

[0001] This invention relates to the field of textile technology, and in particular to a method for producing waterproof nylon yarn. Background Technology

[0002] Nylon (polyamide fiber) is characterized by high strength, good abrasion resistance, and excellent elasticity, and is widely used in clothing, home textiles, and industrial textiles. With the increasing demand from consumers for functional textiles, the market demand for waterproof nylon yarn is growing daily.

[0003] Existing methods for producing waterproof nylon yarn mainly include surface coating and fiber blending. Surface coating typically involves coating the nylon yarn with a single waterproofing agent (such as fluorinated compounds), but this method suffers from problems such as weak bonding between the agent and fiber, a sharp decline in waterproof performance after repeated washing, and a tendency for the coating to cause a stiff feel in the yarn. Fiber blending achieves waterproofing by blending nylon fibers with fibers possessing excellent waterproof properties, but this method suffers from uneven dispersion of the waterproofing components, a loose yarn structure, and poor uniformity of waterproofing. Furthermore, some methods use a single type of waterproofing finishing agent, making it difficult to simultaneously achieve waterproof durability, abrasion resistance, and a soft hand feel, thus limiting the product's application range.

[0004] Therefore, it is of great significance to develop a production method for waterproof nylon yarn that is durable, soft to the touch, and has excellent strength. Summary of the Invention

[0005] The purpose of this invention is to address the problems existing in the prior art by providing a method for producing waterproof nylon yarn. By constructing a complete process system that includes fiber surface synergistic modification, yarn structure optimization, multifunctional fluorine-free composite finishing and gradient curing crosslinking, a high-quality waterproof nylon yarn with durable waterproof performance, excellent mechanical properties, soft hand feel and environmental friendliness is finally obtained.

[0006] To achieve the above objectives, the present invention provides a method for producing waterproof nylon yarn, comprising the following steps:

[0007] S1. The nylon filament is subjected to plasma treatment and silane coupling agent modification in sequence to obtain modified nylon filament;

[0008] S2. The modified nylon filament and polyester elastic filament are mixed and then successively combined, twisted and networked to obtain composite filament;

[0009] S3. Immerse the composite filament in a fluorine-free composite waterproof finishing solution for finishing to obtain waterproof filament;

[0010] S4. The waterproof filaments are subjected to first curing and second curing in sequence, and the waterproof nylon yarn is obtained after post-treatment.

[0011] Preferably, in S1, the process parameters for plasma treatment are as follows: the working gas is a mixture of argon and oxygen, with an oxygen volume fraction of 6-7%; the pressure is 0.07-0.08 MPa; the power is 42-48 W; and the treatment time is 9-11 s.

[0012] Preferably, in S1, the treatment solution used for silane coupling agent modification is an ethanol solution of KH-560, and the mass fraction of KH-560 in the ethanol solution is 1.9-2.1%; the temperature for silane coupling agent modification is 36-38℃, and the time is 16-19 min.

[0013] Preferably, in S2, the mass ratio of modified nylon filament to polyester elastic filament is 78-82:18-22; the twist is 395-405 twists / m, and the twisting speed is 920-980m / min.

[0014] Preferably, in S2, the network point density of the network processing is 48-55 points / m, and the network pressure is 0.45-0.55MPa.

[0015] Preferably, in S3, the fluorine-free composite waterproofing finishing liquid includes the following components:

[0016] Polyether-modified polysiloxane 9-9.5% owf, nano silica dispersion 3.8-4.2% owf, aziridine crosslinking agent 3.2-3.4% owf, xanthan gum 1.6-1.8% owf, polyether-modified silicone oil 4.5-5.5% owf, penetrant JFC 0.75-0.85 g / L.

[0017] Preferably, in S3, the pH value of the fluorine-free composite waterproof finishing liquid is 5.4-5.6.

[0018] Preferably, in S3, the bath ratio is 1:29-31, the temperature is 49-51℃, and the time is 32-34min.

[0019] Preferably, in S4, the temperature for the first curing is 112-114℃ and the time is 9-10 min.

[0020] Preferably, in S4, the second curing temperature is 136-138℃ and the time is 11-12 min.

[0021] The beneficial effects of this invention are as follows:

[0022] 1. This invention provides a method for producing waterproof nylon yarn, comprising the following steps: sequentially subjecting nylon filaments to plasma treatment and silane coupling agent modification to obtain modified nylon filaments; mixing the modified nylon filaments and polyester elastic filaments, and sequentially performing doubling, twisting, and web-forming treatments to obtain composite filaments; immersing the composite filaments in a fluorine-free composite waterproof finishing solution for finishing to obtain waterproof filaments; and sequentially subjecting the waterproof filaments to a first curing and a second curing, followed by post-treatment to obtain waterproof nylon yarn. This invention achieves a dual effect of physical etching and chemical grafting on the nylon fiber surface through continuous synergistic treatment of plasma treatment and silane coupling agent modification. Plasma treatment not only cleans the fiber surface but, more importantly, introduces a large number of active sites on its molecular chains; the subsequent silane coupling agent, through its unique bifunctional structure, forms a strong covalent bond with the active sites on the fiber surface at one end, while providing an efficient reactive interface for the subsequent waterproof layer at the other end. This lays a solid interfacial foundation for durable waterproof performance.

[0023] 2. The multi-component fluorine-free composite waterproof finishing liquid designed in this invention achieves synergistic effects through the complementary functions of its components. Polyether-modified polysiloxane and polyether-modified silicone oil together construct a low surface energy, highly flexible water-repellent main film; the introduction of nano-silica significantly enhances the surface hydrophobic effect by constructing a micro-nano composite rough structure; aziridine crosslinking agents react with the active groups on the fiber and waterproofing agent molecules to form a dense and stable three-dimensional crosslinking network, strongly "locking in" the waterproofing components; xanthan gum acts as a rheology modifier, ensuring uniform penetration and adhesion of the finishing liquid in complex yarn structures. This fluorine-free system achieves excellent waterproof performance while avoiding the potential environmental risks associated with traditional fluorine-containing finishing agents.

[0024] 3. By precisely controlling the ratio of nylon filament to polyester elastic filament, and combining a specific range of twisting processes and web treatment, a tight and stable cohesive structure is achieved in the composite filament. Optimized twisting ensures uniform stress transfer between fibers, while the web treatment significantly enhances the bundle cohesion of the filaments without sacrificing hand feel, effectively preventing structural loosening during subsequent processing and use, thus ensuring the high strength of the yarn.

[0025] 4. This invention employs a two-stage gradient temperature curing process. The first stage, with relatively low-temperature curing, allows the waterproofing agent molecular chains to migrate and align fully, achieving preliminary and gentle cross-linking and laying the foundation for a uniform film structure. The second stage, with higher-temperature curing, further promotes complete cross-linking on the framework of preliminary cross-linking, forming a strong three-dimensional network. This step-by-step curing strategy avoids the drawbacks of a stiff, brittle film caused by rapid high-temperature curing alone, ultimately enabling the yarn to maintain a soft, smooth, and comfortable feel while possessing durable waterproofing capabilities. Detailed Implementation

[0026] This invention provides a method for producing waterproof nylon yarn, comprising the following steps:

[0027] S1. The nylon filament is subjected to plasma treatment and silane coupling agent modification in sequence to obtain modified nylon filament;

[0028] S2. The modified nylon filament and polyester elastic filament are mixed and then successively combined, twisted and networked to obtain composite filament;

[0029] S3. Immerse the composite filament in a fluorine-free composite waterproof finishing solution for finishing to obtain waterproof filament;

[0030] S4. The waterproof filaments are subjected to first curing and second curing in sequence, and the waterproof nylon yarn is obtained after post-treatment.

[0031] In this invention, in S1, the process parameters for plasma treatment are as follows: the working gas is a mixture of argon and oxygen, with an oxygen volume fraction of 6-7%; the pressure is 0.07-0.08 MPa; the power is 42-48 W; and the treatment time is 9-11 s.

[0032] In this invention, in S1, the treatment solution used for silane coupling agent modification is an ethanol solution of KH-560, and the mass fraction of KH-560 in the ethanol solution of KH-560 is 1.9-2.1%; the temperature for silane coupling agent modification is 36-38℃, and the time is 16-19 min.

[0033] In this invention, after the silane coupling agent modification is completed in S1, it is dried at 89-91°C for 26-29 min.

[0034] In this invention, in S2, the mass ratio of modified nylon filament to polyester elastic filament is 78-82:18-22; the twist is 395-405 twists / m, and the twisting speed is 920-980m / min.

[0035] In this invention, in S2, the network point density of the network processing is 48-55 points / m, and the network pressure is 0.45-0.55MPa.

[0036] In this invention, in step S3, the composite filament is dried at 106-109°C for 16-17 minutes, and after drying, it is immersed in a fluorine-free composite waterproof finishing solution.

[0037] In this invention, in S3, the fluorine-free composite waterproof finishing liquid comprises the following components:

[0038] Polyether-modified polysiloxane 9-9.5% owf, nano silica dispersion 3.8-4.2% owf, aziridine crosslinking agent 3.2-3.4% owf, xanthan gum 1.6-1.8% owf, polyether-modified silicone oil 4.5-5.5% owf, penetrant JFC 0.75-0.85 g / L.

[0039] owf is a percentage based on the weight of the fiber (filament).

[0040] In this invention, the preparation method of the nano silica dispersion includes the following steps: dissolving nano silica with a particle size of 28-32 nm and a dispersant (polyethylene glycol 600) in water, and shearing at 1000-3000 rpm for 10-15 min to obtain a nano silica dispersion with a solid content of 26-27%.

[0041] In this invention, the pH value of the fluorine-free composite waterproof finishing liquid in S3 is 5.4-5.6.

[0042] In this invention, the preparation method of the fluorine-free composite waterproof finishing liquid in S3 includes the following steps: In water, penetrant JFC and xanthan gum are added sequentially, and stirred at 150-200 rpm until completely dissolved (no visible particles); then the stirring speed is increased to 800-1000 rpm, and nano-silica dispersion is slowly added, maintaining this speed and stirring for 20-25 minutes; next, polyether-modified polysiloxane, polyether-modified silicone oil, and aziridine crosslinking agent are added sequentially, and stirred at 200-300 rpm until the system is homogeneous (no layering, no precipitation); finally, the pH value is adjusted to 5.4-5.6 with a 5-10% (w / w) citric acid aqueous solution, and the volume is adjusted to the required volume with water, stirred at 200-400 rpm for 8-12 minutes to obtain the final product.

[0043] In this invention, in step S3, the bath ratio is 1:29-31, the temperature is 49-51℃, and the time is 32-34min.

[0044] In this invention, in S4, the temperature of the first curing is 112-114℃ and the time is 9-10 min.

[0045] In this invention, in S4, the second curing temperature is 136-138°C and the time is 11-12 min.

[0046] In this invention, in step S4, the post-processing includes sequential washing, drying, and winding; specifically, the cured filament is first washed with water at 20-25°C for 6.5-7.5 min, then washed with water at 67-69°C for 10.5-11.5 min, then dried at 84-86°C to a moisture content of 5.2-5.8%, and finally wound into a tube by a winding machine to obtain waterproof nylon yarn.

[0047] The present invention will be further described below with reference to embodiments. Unless otherwise defined, the technical or scientific terms used in this invention should have the ordinary meaning understood by one of ordinary skill in the art. The features mentioned above or in the specific examples mentioned in this invention can be combined arbitrarily, and these specific embodiments are only used to illustrate the invention and are not intended to limit the scope of the invention.

[0048] In the following embodiments and comparative examples of the present invention, the nylon filament is nylon 6 filament with a specification of 70D / 48F, purchased from Yiwu Huading Nylon Co., Ltd.; the polyester elastic filament is PET elastic filament with a specification of 40D / 12F, purchased from Zhejiang Guxiandao Green Fiber Co., Ltd.; the polyether-modified polysiloxane is purchased from Guangdong Demei Fine Chemical Group Co., Ltd., model DM-3311; the aziridine crosslinking agent is purchased from Dow Chemical Company, USA, model XZ-92719.01; the xanthan gum is purchased from Sinopharm Chemical Reagent Co., Ltd.; the polyether-modified silicone oil is purchased from Guangzhou Tinci Advanced Materials Co., Ltd., model Tegostar 8452; and the penetrant JFC is purchased from Jiangsu Haian Petrochemical Plant.

[0049] In the following embodiments and comparative examples of the present invention, the preparation method of the nano silica dispersion includes the following steps: dissolving nano silica with a particle size of 30 nm and polyethylene glycol 600 in water, and shearing at 2000 rpm for 13 min to obtain a nano silica dispersion with a solid content of 26.5%.

[0050] Example 1

[0051] This embodiment provides a method for producing waterproof nylon yarn, including the following steps:

[0052] The nylon filaments were subjected to plasma treatment with the following process parameters: working gas was a mixture of argon and oxygen, with an oxygen volume fraction of 6.5%; pressure was 0.075 MPa; power was 45 W; and treatment time was 10 s. Then, the filaments were immersed in a KH-560 ethanol solution (mass fraction 2.0%), treated at 37°C for 18 min, and dried at 90°C for 28 min to obtain the modified nylon filaments.

[0053] Modified nylon filament and polyester elastic filament were mixed at a mass ratio of 80:20, combined by a twinning machine, and then twisted at a twist rate of 400 twists / m and a speed of 950m / min. Finally, a network treatment was performed, with a network point density of 52 points / m and a network pressure of 0.5MPa, to obtain composite filament.

[0054] Preparation of a fluorine-free composite waterproof finishing solution (pH 5.5): The composition is as follows: 9.3% (owf) polyether-modified polysiloxane, 4% (owf) nano-silica dispersion, 3.3% (owf) aziridine crosslinking agent, 1.7% (owf) xanthan gum, 5% (owf) polyether-modified silicone oil, and 0.8 g / L penetrant JFC. The specific preparation method includes the following steps: In water, add penetrant JFC and xanthan gum sequentially, and stir at 200 rpm until completely dissolved; then increase the stirring speed to 900 rpm, slowly add the nano-silica dispersion, and continue stirring at this speed for 23 min; then add polyether-modified polysiloxane, polyether-modified silicone oil, and aziridine crosslinking agent sequentially, and adjust to 250 rpm until the system is homogeneous; finally, adjust the pH to 5.5 with an 8% (w / w) citric acid aqueous solution, dilute to the required volume with water, and stir at 300 rpm for 10 min to obtain the final product.

[0055] The composite filaments were dried at 108°C for 16.5 min, and then immersed in the above-mentioned fluorine-free composite waterproof finishing solution. The solution was then finished for 33 min at a bath ratio of 1:30 and a temperature of 50°C to obtain waterproof filaments.

[0056] The waterproof filaments were cured at 113℃ for 9.5 minutes and then at 137℃ for 11.5 minutes. The cured filaments were first washed with water at 22℃ for 7 minutes and then washed with water at 68℃ for 11 minutes. They were then dried at 85℃ until the moisture content was 5.5%. Finally, they were wound into tubes by a winding machine to obtain waterproof nylon yarn.

[0057] Example 2

[0058] This embodiment provides a method for producing waterproof nylon yarn, including the following steps:

[0059] The nylon filaments were subjected to plasma treatment with the following process parameters: working gas was a mixture of argon and oxygen, with an oxygen volume fraction of 6%; pressure was 0.07 MPa; power was 42 W; and treatment time was 11 s. Then, the filaments were immersed in a KH-560 ethanol solution (mass fraction 1.9%), treated at 36°C for 19 min, and dried at 89°C for 29 min to obtain modified nylon filaments.

[0060] Modified nylon filament and polyester elastic filament were mixed at a mass ratio of 78:22, combined by a twinning machine, and then twisted at a twist rate of 395 twists / m and a speed of 920m / min. Finally, a network treatment was performed, with a network point density of 48 points / m and a network pressure of 0.45MPa to obtain composite filament.

[0061] Prepare a fluorine-free composite waterproof finishing solution (pH 5.4): The composition is as follows: 9% (owf) polyether-modified polysiloxane, 3.8% (owf) nano silica dispersion, 3.2% (owf) aziridine crosslinking agent, 1.6% (owf) xanthan gum, 4.5% (owf) polyether-modified silicone oil, and 0.75 g / L penetrant JFC; the specific preparation method is the same as in Example 1.

[0062] The composite filaments were dried at 106°C for 17 minutes, and then immersed in the above-mentioned fluorine-free composite waterproof finishing solution. The solution was then finished for 34 minutes at a bath ratio of 1:29 and a temperature of 49°C to obtain waterproof filaments.

[0063] The waterproof filaments were cured at 112℃ for 10 minutes and then at 136℃ for 12 minutes. The cured filaments were first washed with water at 20℃ for 7.5 minutes and then washed with water at 67℃ for 11.5 minutes. They were then dried at 84℃ until the moisture content was 5.8%. Finally, they were wound into tubes by a winding machine to obtain waterproof nylon yarn.

[0064] Example 3

[0065] This embodiment provides a method for producing waterproof nylon yarn, including the following steps:

[0066] The nylon filaments were subjected to plasma treatment with the following process parameters: working gas was a mixture of argon and oxygen, with an oxygen volume fraction of 7%; pressure was 0.08 MPa; power was 48 W; and treatment time was 9 s. Then, the filaments were immersed in a KH-560 ethanol solution (mass fraction 2.1%), treated at 38℃ for 16 min, and dried at 91℃ for 26 min to obtain modified nylon filaments.

[0067] Modified nylon filament and polyester elastic filament were mixed at a mass ratio of 82:18, combined by a spinning machine, and then twisted at a twist rate of 405 twists / m and a speed of 980m / min. Finally, a network treatment was performed, with a network point density of 55 points / m and a network pressure of 0.55MPa to obtain composite filament.

[0068] Prepare a fluorine-free composite waterproof finishing solution (pH 5.6): The composition is as follows: 9.5% (owf) polyether-modified polysiloxane, 4.2% (owf) nano silica dispersion, 3.4% (owf) aziridine crosslinking agent, 1.8% (owf) xanthan gum, 5.5% (owf) polyether-modified silicone oil, and 0.85 g / L penetrant JFC; the specific preparation method is the same as in Example 1.

[0069] The composite filaments were dried at 109°C for 16 minutes, and then immersed in the above-mentioned fluorine-free composite waterproof finishing solution. The solution was then finished for 32 minutes at a bath ratio of 1:31 and a temperature of 51°C to obtain waterproof filaments.

[0070] The waterproof filaments were cured at 114℃ for 9 minutes and then at 138℃ for 11 minutes. The cured filaments were first washed with water at 25℃ for 6.5 minutes and then washed with water at 69℃ for 10.5 minutes. They were then dried at 86℃ until the moisture content was 5.2%. Finally, they were wound into tubes by a winding machine to obtain waterproof nylon yarn.

[0071] Comparative Example 1

[0072] This comparative example provides a method for producing waterproof nylon yarn, which differs from Example 1 in that the plasma treatment step is omitted.

[0073] Comparative Example 2

[0074] This comparative example provides a method for producing waterproof nylon yarn, which differs from Example 1 in that the step of silane coupling agent modification is omitted.

[0075] Comparative Example 3

[0076] This comparative example provides a method for producing waterproof nylon yarn, which differs from Example 1 in that the addition of nano-silica dispersion, aziridine crosslinking agent, xanthan gum and polyether modified silicone oil to the fluorine-free composite waterproof finishing liquid is omitted.

[0077] Comparative Example 4

[0078] This comparative example provides a method for producing waterproof nylon yarn, which differs from Example 1 in that the web processing step is omitted.

[0079] Comparative Example 5

[0080] This comparative example provides a method for producing waterproof nylon yarn, which differs from Example 1 in that the curing process is modified to: the waterproof filament is directly cured at 137°C for 21 minutes.

[0081] Experimental Example 1

[0082] The waterproof nylon yarns produced in Examples 1-3 and Comparative Examples 1-5 were subjected to performance tests, and the test results are recorded in Table 1. Waterproof performance: The knitted fabrics made from the yarns were tested according to standard AATCC 22-2014 "Water Resistance: Spray Test". The rating standards were: 100 points - completely dry surface; 90 points - slightly wet surface; 80 points - partially wet surface; 70 points and below - completely wet surface. Wash resistance: The waterproof rating was tested according to standard GB / T 8629-2017 "Home Washing and Drying Procedures for Textile Testing". A standard detergent of 5 g / L was used, and the yarns were washed at 40°C. The waterproof rating was tested after different number of washes (5, 10, and 20 times). Breaking strength and elongation: The tests were conducted according to standard GB / T... 3916-2013 "Determination of breaking strength and elongation at break of single yarn in packaged textiles" uses an electronic single yarn strength tester for testing; hand feel evaluation: 5 experienced textile professionals conduct blind evaluations and score the softness and smoothness of the woven yarn (1-10 points, with higher scores indicating better hand feel), and the average value is taken.

[0083] Table 1 Test Results

[0084]

[0085] As shown in Table 1, Examples 1-3 exhibited excellent initial water resistance (100 points) and superior washability. After 20 washes, the water resistance rating remained at 84-85 points, demonstrating the long-lasting water resistance provided by this invention. However, the initial water resistance and washability of Comparative Example 1 (without plasma treatment) and Comparative Example 2 (without silane coupling agent modification) decreased significantly. This indicates that plasma treatment and silane coupling agent modification work synergistically and are indispensable. Plasma treatment activates the fiber surface and increases reaction sites, while the silane coupling agent constructs a strong "molecular bridge" between the fiber and the subsequent waterproof layer, greatly enhancing the bonding force. Comparative Example 3 (simplified waterproof finishing liquid) performed the worst, proving that the composite waterproof finishing liquid of this invention is a synergistic solution where each component functions synergistically. Nano-silica constructs a micro-nano rough structure, polyether-modified polysiloxane and polyether-modified silicone oil provide low surface energy, aziridine crosslinking agent forms a three-dimensional crosslinking network, and xanthan gum thickens to ensure uniform adhesion. The absence of any key component would result in an incomplete and weak waterproof membrane. The wash resistance of Comparative Example 5 (single curing) was significantly worse than that of the two-stage curing example, indicating that the first curing facilitates the full migration and initial cross-linking of the finishing agent molecular chains, while the second curing achieves complete and robust cross-linking. Omitting this staged process leads to insufficient cross-linking and a decrease in the wash resistance of the waterproof membrane.

[0086] Furthermore, Examples 1-3 maintained high water resistance while also exhibiting excellent strength and elasticity, and achieved the highest hand feel score. This is attributed to the reasonable fiber ratio, optimized twisting, and network treatment (not applied to Comparative Example 4), which imparted a tight and stable yarn structure, as well as the soft touch provided by the fluorine-free finishing agent system. Comparative Example 4 (without network treatment) had a loose yarn structure, resulting in the lowest strength and compromised water resistance uniformity (decreased washability), demonstrating the importance of network treatment for stabilizing yarn structure and ensuring uniform performance. The stiff hand feel of Comparative Example 5 may be due to insufficient movement of some finishing agent molecular chains caused by single high-temperature curing, failing to form a soft network structure, further confirming the necessity of a two-stage curing process for balancing water resistance and hand feel.

[0087] Therefore, the present invention adopts the above-mentioned method for producing waterproof nylon yarn. By constructing a complete process system including fiber surface synergistic modification, yarn structure optimization, multifunctional fluorine-free composite finishing and gradient curing crosslinking, a high-quality waterproof nylon yarn with durable waterproof performance, excellent mechanical properties, soft hand feel and environmental friendliness is finally obtained.

[0088] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solutions of the present invention, and these modifications or equivalent substitutions cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A method for producing waterproof nylon yarn, characterized in that, Includes the following steps: S1. The nylon filament is subjected to plasma treatment and silane coupling agent modification in sequence to obtain modified nylon filament; S2. The modified nylon filament and polyester elastic filament are mixed and then successively combined, twisted and networked to obtain composite filament; S3. The composite filament is immersed in a fluorine-free composite waterproof finishing solution and finished to obtain waterproof filament; S3, the fluorine-free composite waterproof finishing solution includes the following components: polyether modified polysiloxane 9-9.5% owf, nano silica dispersion 3.8-4.2% owf, aziridine crosslinking agent 3.2-3.4% owf, xanthan gum 1.6-1.8% owf, polyether modified silicone oil 4.5-5.5% owf, and penetrant JFC 0.75-0.85 g / L; S4. The waterproof filaments are subjected to a first curing and a second curing in sequence, and waterproof nylon yarn is obtained after post-treatment; in S4, the temperature of the first curing is 112-114℃ and the time is 9-10min; the temperature of the second curing is 136-138℃ and the time is 11-12min.

2. The method for producing waterproof nylon yarn according to claim 1, characterized in that, In S1, the process parameters for plasma treatment are as follows: the working gas is a mixture of argon and oxygen, with an oxygen volume fraction of 6-7%; the pressure is 0.07-0.08 MPa; the power is 42-48 W; and the treatment time is 9-11 s.

3. The method for producing waterproof nylon yarn according to claim 1, characterized in that, In S1, the treatment solution used for silane coupling agent modification is an ethanol solution of KH-560, and the mass fraction of KH-560 in the ethanol solution is 1.9-2.1%; the temperature for silane coupling agent modification is 36-38℃, and the time is 16-19 min.

4. The method for producing waterproof nylon yarn according to claim 1, characterized in that, In S2, the mass ratio of modified nylon filament to polyester elastic filament is 78-82:18-22; the twist is 395-405 twists / m, and the twisting speed is 920-980m / min.

5. The method for producing waterproof nylon yarn according to claim 1, characterized in that, In S2, the network point density for network processing is 48-55 points / m, and the network pressure is 0.45-0.55 MPa.

6. The method for producing waterproof nylon yarn according to claim 5, characterized in that, In S3, the pH value of the fluorine-free composite waterproofing finishing liquid is 5.4-5.

6.

7. The method for producing waterproof nylon yarn according to claim 1, characterized in that, In S3, the bath ratio is 1:29-31, the temperature is 49-51℃, and the time is 32-34 min.

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