Lyocell environmentally friendly yarn with persistent moisture-conducting and quick-drying functions and preparation method and application thereof

Abstract

This invention belongs to the field of textile technology, specifically relating to a lyocell environmentally friendly yarn with long-lasting moisture-wicking and quick-drying functions, its preparation method, and its applications. The preparation method uses lyocell fiber as the base material, which undergoes fluorine-free water-repellent modification treatment, followed by a compact Sirospun spinning process to produce the yarn. This yarn retains the natural skin-friendly and soft texture of lyocell, while also possessing excellent properties such as long-lasting moisture-wicking and quick-drying, good fibrillation resistance, high yarn strength, good spinning properties, evenness, low hairiness, antistatic properties, environmental friendliness, and high cost-effectiveness. It is suitable for preparing high-end functional fabrics for sports and outdoor applications, solving the problems of slow moisture wicking and dissipation, easy fibrillation, poor spinnability, low production efficiency, and high losses associated with existing lyocell fibers, and enabling large-scale production.

Description

Technical Field

[0001] This invention belongs to the field of textile technology, specifically relating to a lyocell environmentally friendly yarn with long-lasting moisture-wicking and quick-drying functions, its preparation method, and its application. Background Technology

[0002] Lyocell fiber, as a new type of green and environmentally friendly fiber, combines the moisture-wicking and breathable properties of cotton with the strength advantages of polyester, and has a stable shrinkage rate, making it a raw material with great development potential in the textile industry. However, the molecular structure of lyocell fiber contains a large number of hydrophilic hydroxyl groups, which, although it has good moisture absorption, also easily traps moisture inside and on the surface of the fiber, resulting in slow moisture wicking and dissipation. When the human body sweats heavily, the fabric's thermal and moisture comfort is poor, limiting its application in moisture-wicking and quick-drying functional fabrics (such as sportswear and outdoor clothing fabrics). At the same time, lyocell fiber is prone to fibrillation during use or washing, leading to fabric pilling, deformation, fading, and lightening of the color, reducing the product quality of lyocell textiles and affecting the consumer's user experience.

[0003] To improve the moisture-wicking and quick-drying properties of lyocell fiber fabrics, existing technologies often employ blending lyocell fibers with quick-drying polyester fibers. However, due to the significant difference in moisture absorption and wicking rates between lyocell and polyester fibers, moisture retention zones easily form between the two fibers after blending, leading to uneven drying and wetting in the fabric and further affecting wearing comfort. Furthermore, the addition of polyester fibers reduces the fabric's eco-friendly attributes, failing to meet the demands of the high-end environmentally friendly functional fabric market. To address the fibrillation problem of lyocell fibers, the industry typically adds cross-linking agents during fiber production to develop cross-linked or semi-cross-linked lyocell fibers. However, the production cost of these modified fibers is high, resulting in uncompetitive pricing and severely limited application, hindering large-scale adoption.

[0004] In addition, lyocell fibers that have undergone functional modification often have increased oil content, resulting in prominent static electricity problems during spinning. The fibers are prone to entanglement in spinning equipment components such as cylinders, rollers, and leather rollers, causing defects such as interruption during spinning, uneven yarn drying, and insufficient breaking strength, which affect the stability of yarn quality and make it difficult to meet the needs of industrial production.

[0005] In summary, there is currently a lack of lyocell yarn on the market that combines long-lasting moisture wicking and quick drying, good anti-fibrillation properties, high cost-effectiveness, and ease of large-scale spinning production. Therefore, developing an environmentally friendly lyocell yarn that can solve the above-mentioned technical problems and its preparation method has become an urgent technical challenge to be solved in this field. Summary of the Invention

[0006] Based on the above technical background, the main objective of this invention is to provide a Lyocell environmentally friendly yarn with long-lasting moisture-wicking and quick-drying functions, its preparation method, and its application, so as to overcome the technical defects of existing Lyocell yarns with poor moisture-wicking and quick-drying properties and poor anti-fibrillation performance.

[0007] To achieve the aforementioned objectives, the technical solution adopted by this invention includes:

[0008] The first aspect of this invention is to provide a method for preparing lyocell environmentally friendly yarn with long-lasting moisture-wicking and quick-drying functions, the preparation method comprising the following steps: S1. Pre-treat the lyocell fiber, then perform fluorine-free water-repellent padding, drying, baking, and relaxation treatment to obtain fluorine-free water-repellent lyocell fiber; S2. The fluorine-free water-repellent Lyocell fiber is humidified and then dried with an antistatic agent solution to obtain antistatic Lyocell fiber. S3, anti-static Lyocell fiber opening and cleaning to form a uniform cotton roll; S4. Comb the cotton rolls into mixed slivers; S5. Combine the raw strips to obtain the cooked strips; S6. Twist the sliver to form roving; S7. Draft, twist and wind the roving to obtain fine yarn; S8. Wind the fine yarn to obtain a cone yarn.

[0009] The steps described above are described in detail below.

[0010] In step S1, step S1 can endow the yarn with durable moisture-wicking and quick-drying properties, water-repellent properties, and anti-fibrillation properties.

[0011] The pretreatment includes the following steps: adding lyocell fibers to water at 55-80°C, followed by adding 0.4-0.6 g / L of a composite degreasing agent at a bath ratio of 1:10-20, stirring for 2-3 minutes, letting stand for 3-5 minutes, then rinsing with overflow water 1-2 times for 1-2 minutes each time, and then centrifuging to dehydrate for 20-60 seconds.

[0012] Preferably, the pretreatment includes the following steps: adding lyocell fibers to water at 75–78°C, followed by adding 0.4–0.5 g / L of a composite degreasing agent at a bath ratio of 1:15–18, stirring for 2–2.5 min, letting stand for 3–5 min, then rinsing with overflow water 1–2 times, 1 min each time, and then centrifuging for 30–45 s. This pretreatment removes the oil carried by the fibers.

[0013] The lyocell fiber is a common type of lyocell fiber with a thickness of 1.3 dtex to 1.67 dtex × 38 mm.

[0014] Preferably, the lyocell fiber is a common type of lyocell fiber with a thickness of 1.33 dtex to 1.4 dtex × 38 mm.

[0015] The composite degreasing agent is Tech-Scour OL degreasing agent or anionic / nonionic composite detergent.

[0016] Liquor ratio is a core parameter in textile dyeing and finishing processes. It describes the proportional relationship between the fabric being dyed and the dye liquor during immersion or exhaustion dyeing, directly affecting dyeing quality, resource consumption, and environmental performance. The liquor ratio is usually expressed in the form of "1:X," and has the following two definitions: Mass ratio: The ratio of the mass (kg) of the fabric (in this invention, the fabric is lyocell fiber) to the mass (kg) of the dye liquor (in this invention, the dye liquor is a composite degreasing agent). For example, 100 kg of fabric is used with 1000 kg of dye liquor, resulting in a liquor ratio of 1:10. Since mass is independent of density, the mass ratio is more accurate.

[0017] Volume ratio: The ratio of fabric mass (kg) to dye liquor volume (L). In actual production, the density of dye liquor is often considered to be 1 (similar to water), so the two definitions can be used equivalently. For example, 100kg of fabric is used with 1000L of dye liquor, and the liquor ratio is also 1:10.

[0018] The fluorine-free water-repellent padding treatment includes the following steps: the fluorine-free waterproof finishing liquid is prepared from a dispersion of paraffin and acrylic acid copolymer. The fluorine-free waterproof finishing agent is diluted with cold water to a concentration of 50–90 g / L, and the pH value of the solution is adjusted to 4–5.5 with 50–70% acetic acid to obtain the fluorine-free waterproof finishing liquid. The pretreated lyocell fibers are placed in the fluorine-free waterproof finishing liquid and padded under conditions of 15–30℃ and a roll pressure of 0.1–0.4 MPa, with a liquid carry-over rate of 80–110%. This padding treatment ensures that the lyocell fibers fully absorb the fluorine-free waterproof finishing liquid, allowing the fluorine-free waterproof finishing agent to adhere evenly to the surface and interior of the lyocell fibers.

[0019] Preferably, the fluorine-free water-repellent padding treatment includes the following steps: the fluorine-free waterproof finishing agent is PHOBOTEX CWR-ACE, which is diluted with cold water to a concentration of 60-80 g / L, and the pH value of the solution is adjusted to 4.8-5.0 with 60% acetic acid to obtain a fluorine-free waterproof finishing solution. The pretreated lyocell fibers are placed in the fluorine-free waterproof finishing solution and padded at a temperature of 20-25°C and a roll pressure of 0.2-0.3 MPa, with a liquid retention rate of 100-110%.

[0020] The fluorine-free waterproof finishing agent used in this invention is made from a dispersion of paraffin and acrylic acid copolymer. It is green and environmentally friendly and contains no harmful substances. This invention does not require the use of expensive crosslinking agents to modify lyocell fibers. It only requires fluorine-free waterproof treatment of lyocell fibers to achieve functional upgrade of lyocell yarn. It has low production cost and high cost performance.

[0021] After being treated with fluorine-free water-repellent padding, the Lyocell fibers are dried at a temperature of 110-130℃ for 30-40 minutes to remove excess moisture from the surface of the Lyocell fibers, so that the fluorine-free water-repellent finishing agent is initially fixed on the fibers.

[0022] Preferably, the lyocell fibers after being treated with fluorine-free water-repellent impregnation are dried at a temperature of 110–120°C for 35–40 minutes.

[0023] The dried lyocell fibers are first baked at 140-145℃ for 1-3 minutes, and then the temperature is raised to 145-150℃ for 2-4 minutes. After baking, the equipment is controlled to slowly cool down to room temperature at a rate of 5-10℃ / min. Slow cooling can avoid stress concentration inside the fiber and the removal of finishing agent caused by sudden cooling.

[0024] Preferably, the dried lyocell fibers are first baked at 140-142°C for 2 minutes, then the temperature is raised to 145-148°C for 3 minutes. After baking, the equipment is controlled to slowly cool down to room temperature at a rate of 5-8°C / min.

[0025] After baking, the Lyocell fibers are relaxed for 20–36 h, preferably 24 h, so that the fluorine-free waterproofing agent forms stable hydrogen bonds with the hydroxyl groups on the surface of the Lyocell fibers, which further improves the durability of water repellency, moisture wicking and quick-drying properties and anti-fibrillation properties.

[0026] In step S2, the non-fluorine water-repellent Lyocell fiber is humidified with a fatty alcohol polyoxyethylene ether antistatic agent solution with a mass concentration of 0.5-1.0% and left to humidify for 24-48 hours. After humidification, it is dried until the moisture regain is 5-12% to obtain antistatic Lyocell fiber.

[0027] Preferably, the non-fluorine water-repellent Lyocell fiber is humidified with a 0.8% (w / w) fatty alcohol polyoxyethylene ether antistatic agent solution, left to humidify for 36 h, and then dried until the moisture regain is 8-10% to obtain antistatic Lyocell fiber.

[0028] This step involves humidifying the fluorine-free water-repellent lyocell fiber raw material with an antistatic agent solution and allowing it to remain moist for a certain period of time. After the antistatic agent has evenly penetrated the fluorine-free water-repellent lyocell fiber, the fiber is then dried.

[0029] In step S3, the antistatic lyocell fibers are opened and cleaned to initially loosen the antistatic lyocell fibers into a single fiber state, forming a uniform cotton roll. The speed of the cotton grabber is set to 700-800 r / min, and the cotton grabbing depth is 3-5 mm; the speed of the cotton opener is set to 300-460 r / min, and the dust bar spacing is 8-12 mm; the cotton roll weight of the lap forming machine is 380-420 g / m, the cotton roll length is 30-40 m, and the short fiber rate is controlled below 8%.

[0030] Preferably, the cotton opening and cleaning process includes the following steps: the cotton grabber's beater speed is set to 750 r / min, the cotton grabbing depth is 4 mm, and the descent amount is 0.5 mm per stroke; the cotton opener's beater speed is set to 400 r / min, and the dust bar spacing is 10 mm; the cotton lap weight of the lap forming machine is 400 g / m, the cotton lap length is 35 m, and the short fiber rate is controlled at 7.5%. Through the cotton opening and cleaning process, impurities and short fibers in the fibers can be removed, and the fibers can be initially loosened into a single fiber state to form a uniform cotton lap.

[0031] Opening and cleaning is the first step in cotton spinning. It involves loosening, removing impurities from, and mixing tightly compressed raw cotton bales to create uniform cotton laps (or cotton streams) for use in the carding process. The main steps include: cotton grabbing, blending, opening, multi-batch blending, and lap forming. Cotton grabbing involves frequently but lightly grabbing the arranged cotton bales to initially loosen them and achieve multi-bale blending. The purpose of opening is to forcefully loosen cotton clumps and remove impurities. Lamination aims to finely loosen the cotton, remove minor impurities, and even out the cotton flow.

[0032] In step S4, the cotton lap is carded into a mixed sliver. The carding machine is set with a cylinder speed of 300-350 r / min, a licker-in speed of 720-780 r / min, a doffer speed of 15-25 r / min, and a flats speed of 50-80 mm / min. The mixed sliver weight is 18-22 g / 5m, and the spacing is set to 5-10 filaments between the cylinder and the flats and 4-5 filaments between the cylinder and the doffer. This reduces fiber compression and friction and improves sliver uniformity.

[0033] Preferably, the cotton lap is carded into a mixed sliver. The carding machine is set with a cylinder speed of 320 r / min, a licker-in speed of 750 r / min, a doffer speed of 20 r / min, and a flats speed of 65 mm / min. The cylinder-flats spacing is 6 filaments, the cylinder-doffer spacing is 4.5 filaments, and the mixed sliver weight is 20 g / 5 m.

[0034] The cotton lap is combed into a mixed sliver using a carding machine to remove impurities from the fibers. This invention solves technical difficulties in the production process, such as static electricity, fiber entrapment, and difficulty in forming slivers, by optimizing the carding spacing, the speed of the carding rollers, the cylinder, and the doffer. It also removes filament bundles from the fibers and improves the uniformity of the yarn.

[0035] In step S5, the specific steps of the sliver consolidation are as follows: the number of slivers consolidated at the first consolidation is 6-8, the number of slivers consolidated at the second consolidation is 6-8, the number of slivers consolidated at the third consolidation is 6-8, the roller spacing is 10-12 mm in the front zone and 15-18 mm in the back zone, the total draw ratio is set to 6.3-10.0, and the mixed cooked sliver quantity is 15-19 g / 5m.

[0036] Preferably, the specific steps of the sliver consolidation are as follows: 7 slivers are combined in the first consolidation, 8 slivers in the second consolidation, and 8 slivers in the third consolidation; the roller spacing is 11 mm in the front zone and 16 mm in the back zone; the total draw ratio is set to 8; and the mixed cooked sliver quantity is 17.5 g / 5m.

[0037] This invention further improves fiber straightness through three drawing processes and a self-regulating leveling function; and improves sliver quality by optimizing roller spacing, mixing ratio, draft ratio, and spinning speed.

[0038] In step S6, the sliver is twisted and shaped, with the twist coefficient controlled at 80–100, the roller spacing at the front zone 12–15 mm and at the back zone 20–25 mm, the draw ratio 5–8 times, and the winding density 0.4–0.6 g / cm³. 3 These molding conditions prevent Lyocell fibers from slipping and tangling.

[0039] Preferably, the sliver is twisted and shaped with a twist coefficient controlled at 90, roller spacing of 13 mm in the front zone and 22 mm in the rear zone, a draw ratio of 6.5, and a winding density of 0.5 g / cm³. 3 .

[0040] After further drafting and twisting, the sliver is formed into a package that facilitates subsequent production. This invention effectively improves the uniformity of the yarn and reduces yarn hairiness by optimizing the roller spacing, spinning speed, draft ratio, and roving twist of the roving, thereby further improving the quality of the yarn.

[0041] In step S7, the roving is drafted, twisted, and wound, with the twist coefficient controlled at 300-450, the roller spacing at the front zone 10-12 mm and the middle and rear zones 18-22 mm, the total draft ratio at 16-55 times, the yarn weight at 1.5-6.9 g / 100m, and the spinning machine spindle speed at 9000-14000 r / min.

[0042] The roving is drafted, twisted, and wound with a twist coefficient controlled at 380. The roller spacing is 11 mm in the front zone and 20 mm in the middle and rear zones, with a total draft ratio of 29 times. The yarn weight is 1.85 g / 100m, and the spindle speed is 12000 r / min.

[0043] The roving is drafted, twisted, and wound to form yarn. This invention improves yarn uniformity by optimizing roller spacing, enhances yarn quality by optimizing draft distribution, and further improves yarn quality by optimizing yarn twist and using compact Siro spinning.

[0044] In step S8, the yarn is wound: the winding speed is set to 700–1200 m / min, the tension is controlled at 8–15 cN, and the yarn clearer is set with yarn defect thresholds of N: 250–350% and S: 100–200%. 2.0cm, L: 30-50% 40cm, T: -30~-40% 40cm, remove coarse and fine details and cotton knots and impurities.

[0045] Preferably, the yarn winding speed is set to 1000 m / min, the tension to 10 cN, and the yarn defect thresholds for the yarn clearer are N: 300% and S: 150%. 2.0cm, L:40% 40cm, T: -35% 40cm.

[0046] Fine yarn is wound into cones, which facilitates transportation in subsequent processes. At the same time, winding can optimize the yarn clearing curve, remove harmful defects, and ensure the quality of the finished yarn.

[0047] A second aspect of the present invention is to provide a lyocell environmentally friendly yarn with durable moisture-wicking and quick-drying functions prepared by the preparation method described in the first aspect of the present invention.

[0048] This invention uses ordinary Lyocell fiber as the base material and obtains water-repellent Lyocell fiber through fluorine-free water-repellent modification treatment. While retaining the texture and physical properties of Lyocell fiber, it endows the yarn with excellent moisture-wicking and quick-drying properties and antifibrillation, and can still maintain excellent protective performance after multiple washes. This invention comprehensively optimizes yarn count, twist, and spinning parameters through fluorine-free water-repellent modification treatment and compact Siro spinning process, thereby improving the quality of spun yarn and reducing the impact of fibrillation to a controllable range.

[0049] A third aspect of this invention is to provide an application of lyocell eco-friendly yarn with long-lasting moisture-wicking and quick-drying properties in the preparation of knitted and woven fabrics.

[0050] The Lyocell eco-friendly yarn with long-lasting moisture-wicking and quick-drying function described in this invention has a natural texture, is skin-friendly, and has high-efficiency moisture-wicking and quick-drying functions. It can be applied to clothing categories such as sports quick-drying clothing and outdoor fitness clothing. It can also be extended to textiles such as lightweight tops and base layers that require comfort and quick-drying in daily commutes, providing consumers with clothing options that combine natural texture, skin-friendly experience, and high-efficiency functions.

[0051] The beneficial effects of this invention are as follows: (1) This invention uses ordinary lyocell fiber as the base material and through fluorine-free water-repellent modification treatment, opening and cleaning cotton, combing cotton rolls into mixed raw slivers, combining raw slivers, twisting and shaping the slivers and stretching and twisting winding treatment, the resulting lyocell fiber has excellent properties such as long-lasting water repellency, high moisture wicking and quick-drying efficiency, and excellent antifibrillation. It solves the shortcomings of traditional lyocell fiber such as slow moisture wicking and dissipation, easy fibrillation, and easy pilling and deformation of fabric, and greatly improves the durability and wearing comfort of the product.

[0052] (2) The present invention uses a fluorine-free waterproof finishing agent to treat lyocell fibers with fluorine-free waterproofing. Through the stable hydrogen bond between the fluorine-free waterproof finishing agent and the hydroxyl groups of lyocell fibers, a breathable and water-repellent membrane is formed on the surface of lyocell fibers. This membrane can effectively block external moisture while retaining the moisture absorption and wicking capacity of the internal channels of lyocell fibers. This makes the lyocell yarn have both water-repellent and moisture-wicking and quick-drying properties, resulting in high comfort and solving the contradiction between moisture wicking and water repellency in textiles.

[0053] (3) After the present invention performs fluorine-free waterproofing treatment on Lyocell fiber, it further improves the bond between the fluorine-free waterproofing agent and Lyocell fiber by drying, step-by-step baking and relaxation curing, so that the fabric made from the yarn can still maintain excellent water repellency, moisture wicking and quick-drying and protective properties after multiple washes.

[0054] (4) In response to the problems of high static electricity, easy entanglement and poor spinnability of modified lyocell fibers, this invention effectively solves the problems of high static electricity, fiber fall-off, difficulty in forming slivers and many yarn defects by antistatic conditioning, opening and cleaning, fine carding, drawing, twisting and forming of slivers, compact Siro spinning and winding of fibers, and optimizing the above operating parameters. The resulting lyocell yarn has high yarn strength, uniform yarn, less hairiness, high production efficiency and low loss, and is suitable for industrial continuous production.

[0055] (5) The Lyocell yarn obtained by the present invention retains the natural skin-friendly and soft texture of Lyocell, and also gives it excellent water-repellent and moisture-wicking properties, making it suitable for the preparation of various fabrics such as knitted and woven fabrics, and is suitable for high-end textiles such as sports quick-drying clothes, outdoor fitness clothes, commuter light tops, and base shirts. Detailed Implementation

[0056] The present invention will now be described in detail, and its features and advantages will become clearer and more apparent from these descriptions.

[0057] Example The present invention is further illustrated below with specific examples. These embodiments are merely illustrative and not intended to limit the scope of the invention. All raw materials used in the embodiments of the present invention are commercially available.

[0058] Example 1 This embodiment focuses on preparing a Lyocell environmentally friendly yarn with long-lasting moisture-wicking and quick-drying properties. The specific preparation steps are as follows: S1. Fluorine-free water-repellent modification treatment of lyocell fibers: PHOBOTEX CWR-ACE is preferred as the fluorine-free water-repellent finishing agent. The agent is diluted with cold water to a concentration of 60 g / L, and the pH of the solution is adjusted to 5.0 with 60% acetic acid to obtain the fluorine-free water-repellent finishing solution. Ordinary lyocell fibers of 1.4 dtex × 38 mm are selected and placed in tap water at 78℃. Then, 0.5 g / L of the composite degreasing agent Tech-Scour OL is added at a bath ratio of 1:18. After stirring for 2.5 min, the solution is allowed to stand for 5 min, rinsed twice with overflow water (1 min each time), and centrifuged for 45 s. The pretreated fibers are then immersed in the fluorine-free water-repellent finishing solution, with the temperature controlled at 25℃, the roller pressure at 0.3 MPa, and the liquid retention rate at 110%. The impregnated fibers are then sent to a dryer and dried at 110℃ for 40 min, followed by step-by-step baking: first at 140℃ for 2 min, then at 145℃ for 3 min. The solution is cooled to room temperature at a rate of 5℃ / min and allowed to relax naturally for 24 hours to obtain fluorine-free water-repellent lyocell fiber.

[0059] S2. Fiber conditioning treatment: Humidify with 0.8% fatty alcohol polyoxyethylene ether antistatic agent solution, humidify for 36 hours, and dry until the moisture regain is 9% to obtain antistatic lyocell fiber.

[0060] S3. Opening and cleaning: This process initially loosens the antistatic lyocell fibers into single fibers, forming a uniform cotton roll. The cotton grabber's beater speed is set to 750 r / min, and the grabbing depth is 4 mm; the opening machine's beater speed is 400 r / min, and the dust bar spacing is 10 mm; the cotton roll weight is 400 g / m, the length is 35 m, and the short fiber content is controlled at 7.5%. S4. Carding: The cotton lap is carded into a blended sliver. The carding machine is set with a cylinder speed of 320 r / min, a licker-in speed of 750 r / min, a doffer speed of 20 r / min, and a flats speed of 65 mm / min. The cylinder-flats spacing is 6 filaments, the cylinder-doffer spacing is 4.5 filaments, and the blended sliver weight is 20g / 5m. S5, raw slivers: 7 slivers for the first sliver and 8 slivers for the second and third slivers; roller spacing: 11 mm in the front zone and 16 mm in the back zone; total draw ratio: 8.0; mixed cooked sliver weight: 17.5 g / 5m. S6. Roving process: twist coefficient 90, roller spacing 13 mm in the front zone and 22 mm in the back zone, draft ratio 6.5, winding density 0.5 g / cm³. 3 ; S7. Spinning process: twist coefficient 380, roller spacing 11 mm in the front zone and 20 mm in the middle and back zones, total draft ratio 29 times, yarn weight 1.85 g / 100m, spindle speed 12000 r / min. S8. Winding process: Winding speed 1000 m / min, tension 10 cN, yarn defect thresholds for the yarn clearer: N: 300%, S: 150%. 2.0cm, L:40% 40cm, T: -35% 40cm, to obtain the target yarn.

[0061] Example 2 This embodiment focuses on preparing a Lyocell environmentally friendly yarn with long-lasting moisture-wicking and quick-drying properties. The specific preparation steps are as follows: S1. Fluorine-free water-repellent modification treatment of lyocell fibers: PHOBOTEX CWR-ACE was selected as the fluorine-free water-repellent finishing agent. The agent was diluted with cold water to a concentration of 80 g / L, and the pH of the solution was adjusted to 4.8 with 60% acetic acid to obtain the fluorine-free water-repellent finishing solution. Ordinary lyocell fibers with a diameter of 1.33 dtex × 38 mm were selected and placed in tap water at 75℃. Then, 0.4 g / L of Guangmei Chemical GM-1101 anionic / nonionic composite detergent was added at a bath ratio of 1:15. After stirring for 2 minutes, the solution was allowed to stand for 3 minutes, rinsed once with overflow water (1 minute each time), and centrifuged for 30 seconds. The pretreated fibers were then immersed in the fluorine-free water-repellent finishing solution, with the temperature controlled at 20℃, the roller pressure at 0.2 MPa, and the liquid retention rate at 100%. The impregnated fibers were then sent to a dryer and dried at 120℃ for 35 minutes, followed by step-by-step baking. The first step was baking at 142℃ for 2 minutes. The temperature was then raised to 148℃ for 3 minutes, and then cooled to room temperature at a rate of 8℃ / min. The mixture was then allowed to cool and relax naturally for 24 hours to obtain fluorine-free water-repellent lyocell fiber.

[0062] S2. Fiber conditioning treatment: Humidify with 0.5% fatty alcohol polyoxyethylene ether antistatic agent solution, humidify for 24 hours, and dry to a moisture regain of 8%; to obtain antistatic lyocell fiber.

[0063] S3. Opening and cleaning: This process initially loosens the antistatic lyocell fibers into single fibers, forming a uniform cotton roll. The cotton grabber operates at a speed of 700 r / min with a grabbing depth of 3 mm; the cotton opener operates at a speed of 350 r / min with a dust bar spacing of 8 mm; the cotton roll weight is 380 g / m, the length is 30 m, and the short fiber content is controlled at 7.5%. S4. Carding: The cotton lap is carded into a mixed sliver. The carding machine is set with a cylinder speed of 300 r / min, a licker-in speed of 720 r / min, a doffer speed of 15 r / min, and a flats speed of 50 mm / min. The cylinder-flats spacing is 5 filaments, the cylinder-doffer spacing is 4 filaments, and the mixed sliver weight is 18g / 5m. S5, raw strips: 6 strips for the first and third layers; roller spacing: 10 mm in the front zone and 15 mm in the back zone; total draw ratio: 6.3; mixed cooked strip weight: 15.5 g / 5m. S6. Roving process: twist coefficient 80, roller spacing 12 mm in the front zone and 20 mm in the back zone, draft ratio 5, winding density 0.4 g / cm³. 3 ; S7. Spinning process: twist coefficient 300, roller spacing 10 mm in the front zone and 18 mm in the middle and back zones, total draft ratio 25 times, yarn weight 2.48 g / 100m, spindle speed 9000 r / min. S8. Winding process: Winding speed 1200 m / min, tension 12 cN, yarn defect thresholds for the yarn clearer: N: 300%, S: 150%. 2.0cm, L:40% 40cm, T: -35% 40cm, to obtain the target yarn.

[0064] Example 3 This embodiment focuses on preparing a Lyocell environmentally friendly yarn with long-lasting moisture-wicking and quick-drying properties. The specific preparation steps are as follows: S1. Fluorine-free water-repellent modification treatment of Lyocell fiber: The modification treatment parameters are the same as in Example 1; S2. Fiber conditioning treatment: Humidify with a 1.0% fatty alcohol polyoxyethylene ether antistatic agent solution, humidify for 48 hours, and dry to a moisture regain of 10%; to obtain antistatic lyocell fiber.

[0065] S3. Opening and cleaning: This process initially loosens the antistatic lyocell fibers into single fibers, forming a uniform cotton roll. The cotton grabber operates at 800 r / min with a grabbing depth of 5 mm; the cotton opener operates at 460 r / min with a dust bar spacing of 12 mm; the cotton roll weight is 420 g / m, the length is 40 m, and the short fiber content is controlled at 7.8%. S4. Carding: The cotton lap is carded into a blended sliver. The carding machine is set with a cylinder speed of 350 r / min, a licker-in speed of 780 r / min, a doffer speed of 25 r / min, and a flats speed of 80 mm / min. The cylinder-flats spacing is 8 filaments, the cylinder-doffer spacing is 5 filaments, and the blended sliver weight is 22 g / 5m. S5, raw slivers: 8 slivers for the first sliver and 8 slivers for the second and third slivers; roller spacing: 12 mm in the front zone and 18 mm in the back zone; total draw ratio: 8.4; mixed cooked sliver weight: 19 g / 5m. S6. Roving process: twist coefficient 100, roller spacing 15 mm in the front zone and 25 mm in the back zone, draft ratio 5, winding density 0.6 g / cm³. 3 ; S7. Spinning process: twist coefficient 450, roller spacing 12 mm in the front zone and 22 mm in the middle and back zones, total draft ratio 25 times, yarn weight 3.0 g / 100m, spindle speed 14000 r / min; S8. Winding process: Winding speed 1200 m / min, tension 15 cN, yarn defect thresholds for the yarn clearer: N: 300%, S: 150%. 2.0cm, L:40% 40cm, T: -35% 40cm, to obtain the target yarn.

[0066] Comparative Example Comparative Example 1 (without fluoride-free water-repellent modification treatment) This comparative example focuses on the preparation of a Lyocell yarn. The specific preparation steps are as follows: S1. Fiber Pretreatment and Conditioning: Select ordinary lyocell fibers with a diameter of 1.5 dtex × 38 mm, place them in tap water at 78℃, add 0.5 g / L Guangmei Chemical GM-1101 anionic / nonionic composite detergent, with a liquor ratio of 1:18, stir for 2.5 min, let stand for 4 min, rinse twice with overflow water (1 min each time), centrifuge for 45 s to remove water; humidify with 0.8% fatty alcohol polyoxyethylene ether antistatic agent solution, humidify for 36 h, and dry until the moisture regain is 9%; S2, Opening and cleaning cotton: Parameters are the same as in Example 1; S3, Carding into slivers: Parameters are the same as in Example 1; S4. Strip forming and rolling: Parameters are the same as in Example 1; S5. Roving process: Parameters are the same as in Example 1; S6. Spinning process: Parameters are the same as in Example 1; S7. Winding process: The parameters are the same as in Example 1, and the comparison yarn 1 is obtained.

[0067] Comparative Example 2 (using conventional ring spinning process, non-compact Siro spinning) This comparative example focuses on the preparation of a Lyocell yarn. The specific preparation steps are as follows: S1. Fluorine-free water-repellent modification treatment of Lyocell fiber: The parameters are completely consistent with those in Example 1, and water-repellent Lyocell fiber is obtained. S2. Fiber conditioning treatment: The parameters are the same as in Example 1 (humidify with 0.8% fatty alcohol polyoxyethylene ether antistatic agent solution, humidify for 36 h, and dry to a moisture regain of 9%). S3, opening and cleaning cotton: parameters are the same as in Example 1; S4. Carding into slivers: Parameters are the same as in Example 1; S5. Strip forming and rolling: Parameters are the same as in Example 1; S6. Roving process: Parameters are the same as in Example 1; S7. Spinning process: The conventional ring spinning process is adopted, with a twist coefficient of 380, roller spacing of 11 mm in the front zone and 20 mm in the middle and back zones, a total draft ratio of 29 times, a yarn weight of 1.8 g / 100m, and a spindle speed of 12000 r / min. S8. Winding process: The parameters are the same as in Example 1, and the comparison yarn 2 is obtained.

[0068] Experimental Example Experiment Example 1 Performance Test The yarns prepared in Examples 1-3 and Comparative Examples 1-2, and the knitted Roman fabrics woven from them, were subjected to performance tests. The test standards and results are shown in Table 1 below: Table 1 Test Standards and Test Results

[0069] As shown in Table 1, the yarns and fabrics prepared in Examples 1-3 are generally superior to Comparative Examples 1 and 2 in terms of breaking strength, evenness, anti-pilling properties, moisture absorption and quick-drying properties, breathability, and color fastness. These results fully demonstrate the significant advantages of the preparation process combining fluorine-free water-repellent modification treatment with compact Sirospinning, resulting in yarns with excellent yarn quality. Fabrics made from these yarns exhibit superior properties such as moisture wicking and quick-drying, anti-fiberization, good breathability, and high color fastness.

[0070] Compared with Example 1, Comparative Example 1 did not undergo fluorine-free water-repellent modification treatment, and its fabric exhibited inferior anti-pilling, anti-washing color fastness, and moisture-wicking and quick-drying properties. These results indicate that fluorine-free water-repellent modification treatment is crucial for achieving durable moisture-wicking, quick-drying, and anti-fiberization properties in Lyocell fabrics.

[0071] Compared with Example 1, Comparative Example 2 did not use the compact Sirospinning process, but used the conventional ring spinning process. Its yarn breaking strength, yarn evenness, and fabric anti-pilling properties were all inferior to those of Example 1. The above results show that the compact Sirospinning process can effectively improve the yarn quality of modified Lyocell fiber and optimize fabric performance.

[0072] The present invention has been described in detail above with reference to specific embodiments and exemplary examples; however, these descriptions should not be construed as limiting the present invention. Those skilled in the art will understand that various equivalent substitutions, modifications, or improvements can be made to the technical solutions and embodiments of the present invention without departing from the spirit and scope of the invention, and all such modifications and improvements fall within the scope of the present invention. The scope of protection of the present invention is defined by the appended claims.

Claims

1. A method for preparing lyocell environmentally friendly yarn with long-lasting moisture-wicking and quick-drying functions, characterized in that, The preparation method includes the following steps: S1. Pre-treat the lyocell fiber, then perform fluorine-free water-repellent padding, drying, baking, and relaxation treatment to obtain fluorine-free water-repellent lyocell fiber; S2. The fluorine-free water-repellent Lyocell fiber is humidified and soaked with an antistatic agent solution, and then dried to obtain antistatic Lyocell fiber. S3, anti-static Lyocell fiber opening and cleaning to form a uniform cotton roll; S4. Comb the cotton rolls into mixed slivers; S5. Combine the raw strips to obtain the cooked strips; S6. Twist the sliver to form roving; S7. Draft, twist and wind the roving to obtain fine yarn; S8. Wind the fine yarn to obtain a cone yarn.

2. The preparation method according to claim 1, characterized in that, In step S1, The pretreatment includes the following steps: adding Lyocell fiber to water at 55-80°C, then adding 0.4-0.6 g / L of a composite degreasing agent at a bath ratio of 1:10-20, stirring for 2-3 minutes, letting stand for 3-5 minutes, then rinsing with overflow water 1-2 times, each time for 1-2 minutes, and then centrifuging to dehydrate for 20-60 seconds; The fluorine-free water-repellent padding treatment includes the following steps: diluting the fluorine-free water-repellent finishing agent with cold water to a concentration of 50-90 g / L, and adjusting the pH of the solution to 4-5.5 with 50-70% acetic acid to obtain a fluorine-free water-repellent finishing solution; placing the pretreated lyocell fibers in the fluorine-free water-repellent finishing solution and performing padding treatment at a temperature of 15-30℃ and a roll pressure of 0.1-0.4 MPa, with a liquid retention rate of 80-110%. The fluorine-free water-repellent lyocell fibers were dried at 110–130°C for 30–40 min. Then, the dried lyocell fibers were baked at 140–145°C for 1–3 min, and then the temperature was raised to 145–150°C for 2–4 min. After baking, the temperature was slowly lowered to room temperature at a rate of 5–10°C / min, and finally relaxed for 20–36 h.

3. The preparation method according to claim 1, characterized in that, In step S2, Fluorine-free water-repellent Lyocell fibers were humidified with a fatty alcohol polyoxyethylene ether antistatic agent solution with a mass concentration of 0.5-1.0% and left to humidify for 24-48 hours. After humidification, the fibers were dried until the moisture regain was 5-12% to obtain antistatic Lyocell fibers.

4. The preparation method according to claim 1, characterized in that, In step S3, To combat static electricity in lyocell fiber opening and cleaning, the cotton grabber's beater speed should be set to 700–800 r / min, with a grabbing depth of 3–5 mm; the cotton opener's beater speed should be set to 300–460 r / min, with a dust bar spacing of 8–12 mm; the lap forming machine should have a lap weight of 380–420 g / m, a lap length of 30–40 m, and a short fiber content controlled below 8%.

5. The preparation method according to claim 1, characterized in that, In step S4, The cotton lap is carded into a blended sliver. The carding machine is set with a cylinder speed of 300-350 r / min, a licker-in speed of 720-780 r / min, a doffer speed of 15-25 r / min, and a flats speed of 50-80 mm / min. The blended sliver is weighed at 18-22 g / 5m, and the spacing between the cylinder and flats is 5-10 filaments and between the cylinder and doffer is 4-5 filaments.

6. The preparation method according to claim 1, characterized in that, In step S5, The specific steps for combining raw slivers are as follows: 6-8 slivers are combined for the first combining, 6-8 slivers for the second combining, and 6-8 slivers for the third combining. The roller spacing is 10-12 mm in the front zone and 15-18 mm in the back zone. The total draw ratio is set to 6.3-10.

0. The quantitative amount of the mixed cooked slivers is 15-19 g / 5m.

7. The preparation method according to claim 1, characterized in that, In step S6, The sliver is twisted and shaped, with the twist coefficient controlled at 80–100, the roller spacing at the front zone 12–15 mm and at the back zone 20–25 mm, the draw ratio 5–8 times, and the winding density 0.4–0.6 g / cm³. 3 .

8. The preparation method according to claim 1, characterized in that, In step S7, The roving is drafted, twisted, and wound, with the twist coefficient controlled at 300–450. The roller spacing is 10–12 mm in the front zone and 18–22 mm in the middle and rear zones. The total draft ratio is 16–55 times, the yarn weight is 1.5–6.9 g / 100m, and the spinning machine spindle speed is 9000–14000 r / min. In step S8, the yarn is wound: the winding speed is set to 700–1200 m / min, the tension is controlled at 8–15 cN, and the yarn clearer is set with yarn defect thresholds of N: 250–350% and S: 100–200%. 2.0cm, L: 30-50% 40cm, T: -30~-40% 40cm.

9. A lyocell environmentally friendly yarn with durable moisture-wicking and quick-drying function prepared by the preparation method according to any one of claims 1 to 8.

10. The application of the Lyocell environmentally friendly yarn with durable moisture-wicking and quick-drying function as described in claim 9 in the preparation of knitted fabrics and woven fabrics.

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