Spinning process of anti-pilling cashmere yarn

Abstract

This invention provides a spinning process for anti-pilling cashmere yarn, which uses an electrochemically prepared dyeing auxiliary agent. The dyeing auxiliary agent has a high dyeing rate for dark dyes, resulting in bright colors. The produced products have low weight loss, high strength, low short-length waste, and high spinning yield. While obtaining excellent products, energy consumption is reduced and production efficiency is improved, and the pilling grade of cashmere fabric is ≥3.5.

Description

Technical Field

[0001] This invention relates to a spinning process for anti-pilling cashmere yarn, specifically a process for preparing dyeing auxiliaries for cashmere yarn. Background Technology

[0002] Traditionally, cashmere products are considered prone to pilling, a characteristic that affects their care properties. Cashmere products are generally considered to require special care and washing, and should not be machine washed. However, with the fast pace of modern life, especially among young people, lifestyles have changed, and they are less willing to spend excessive time washing and caring for clothes. This has significantly impacted consumer demand for cashmere products. Therefore, the need to address the pilling issue and enhance the ease of care and machine washability of cashmere products is becoming increasingly prominent.

[0003] The scale layer and cortex are the main structural components of cashmere fibers, and cell membrane complexes are also present in both layers. The scale layer is located on the outer side of the cashmere fiber, while the cortex is located on the inner side, and the cortex is the main component of cashmere fibers. The scale layer, cortex, and cell membrane complexes significantly influence the properties of cashmere fibers. Cashmere fibers have moderate strength, high elasticity, and a natural, soft color. External factors such as acids, alkalis, and heat have a more pronounced effect on cashmere than on fine wool. Even at relatively low temperatures and in low concentrations of acid or alkali solutions, cashmere fibers are severely damaged. Cashmere fibers are particularly sensitive to chlorine-containing oxidizing agents.

[0004] Cashmere and wool are both protein fibers with similar chemical properties. Therefore, dyes suitable for dyeing wool are also generally suitable for dyeing cashmere fibers. Commonly used dyes for wool dyeing include reactive dyes, acid dyes, acid mordant dyes, and metal complex dyes. Acid dyes have advantages such as a complete color spectrum and bright colors, but their color fastness is relatively poor; samples dyed with acid mordant dyes have dull colors; metal complex dyes not only cause serious damage to fibers, but also cause significant environmental pollution due to chromium ions. These problems seriously hinder the further development of the wool textile industry. Reactive dyes differ from other dyes in structure, containing multiple reactive groups in their molecular structure. They can react not only with highly reactive amino groups, but also with thiol groups and hydroxyl groups, and have advantages such as bright colors, a complete color spectrum, ease of use, and strong applicability.

[0005] Based on the characteristics of reactive dyes for dyeing wool, people have synthesized reactive dyes specifically for wool dyeing (referred to as wool reactive dyes). Examples include α-bromoacrylamide derivatives, difluorochloropyrimidine, and N-methylaminoethanesulfonic acid derivatives.

[0006] The dyeing process of cashmere has a significant impact on the pilling resistance and rubbing fastness of its fabrics. Even cashmere fibers from the same batch, processed into different colors using ordinary dyeing techniques, will exhibit variations in their pilling resistance and rubbing fastness. Due to different dyeing requirements—including dye dosage, dyeing time, and pH value—darker colors typically have lower pilling resistance, while lighter colors have higher resistance, and the difference in rubbing fastness is also evident. It's worth noting that traditional dyeing processes, which negatively affect pilling and rubbing fastness, often result in unstable pH values ​​in cashmere, making it difficult to remove surface dye. This not only affects the fabric's rubbing fastness but also makes it unsuitable for human wear.

[0007] Here, we need to introduce low-temperature dyeing. The dye first dissolves in the dye bath. After dissolving, it migrates to the vicinity of the fiber through the circulation of the dye bath and its own thermal motion. The dye molecules rely on their own thermal motion to reach the diffusion boundary layer and further move towards the fiber surface. Finally, under the combined action of various forces, the dye molecules adsorbed on the fiber surface diffuse and become fixed inside the fiber through thermal motion. Alternatively, by adding micro-suspension auxiliaries, the dye forms auxiliary-dye aggregates in the dye bath. These dye aggregates are uniform in size, which enhances the interaction between the dye and the fiber. Therefore, under lower temperature conditions, the dye can be uniformly adsorbed on the fiber surface. As the dye bath temperature increases, the thermal motion of the dye molecules intensifies, and the dye aggregates adsorbed on the fiber surface depolymerize. Subsequently, the dye molecules can diffuse into the fiber and become fixed inside the fiber.

[0008] For example, Zhejiang Cashmere Family Apparel Co., Ltd. (CN114507995A) discloses a dyeing process for cashmere knitted garments. Based on the existing problems of pilling and unstable rubbing fastness in dark-colored cashmere knitwear, this process provides a dyeing process for cashmere knitted garments to address the aforementioned technical problems of pilling and unstable rubbing fastness in existing dark-colored cashmere knitwear. The process includes the following steps: 1) Adding 1% to 3% by weight of dye to cashmere fibers; 2) After step 1), adding 2% by weight of low-temperature dyeing auxiliary agent to cashmere fibers; 3) After step 2), adding 0.2% to 0.7% by weight of penetrant to cashmere fibers; 4) After step 3), adding cashmere fiber... (1) Add 1%–1.5% formic acid by weight, heat to 80℃–90℃, and adjust the pH to 4–5); after step 4), add 1%–1.5% ammonia by weight of cashmere fiber for the first wash, with a pH of 8.0–9.0; (6) after step 5), add 1%–1.5% ammonia by weight of cashmere fiber for a second wash, with a pH of 8.0–9.0; (7) after step 6), add the corresponding formic acid for neutralization, with a pH of 5.5–7.5, which thoroughly removes floating color and saves energy, making the cashmere fiber exhibit stable weak alkalinity, thereby improving the pilling resistance of dark-colored cashmere fibers and stabilizing the rubbing fastness.

[0009] For example, Jiangsu Lianhong Textile Co., Ltd.'s CN107151915A describes a dyeing method for yak wool using anti-felting pretreatment, which includes: (1) anti-felting pretreatment, mainly including fiber oxidation treatment; fiber reduction treatment; fiber protease treatment; protease inactivation treatment; and washing; (2) dyeing, using reactive dyes for low-temperature dyeing. This method utilizes anti-felting pretreatment for dyeing to replace the original single dyeing technique, which is beneficial for the dyeing effect. On the other hand, the anti-felting treatment further opens the scale layer of yak wool on the basis of the original decolorization, enhancing the diffusion ability of dye molecules in this area and improving the dyeing activity of yak wool fibers, thereby achieving low-temperature dyeing of yak wool. Summary of the Invention

[0010] The purpose of this invention is to provide a spinning process for anti-pilling cashmere yarn. A bisquaternary ammonium cationic surfactant solution is prepared electrochemically and then configured as a dyeing auxiliary. This dyeing auxiliary has a high dyeing rate for dark dyes, resulting in bright colors. The produced product has low weight loss, high strength, low yarn shedding, and high yarn yield. While obtaining excellent products, it reduces energy consumption, improves production efficiency, and achieves less pilling in cashmere fabrics. Specifically:

[0011] A spinning process for anti-pilling cashmere yarn includes the following steps:

[0012] Cashmere inspection, raw material dyeing, wool blending, wool combing, carding, combing, drawing, roving, spinning, winding, doubling, twisting, yarn forming, yarn inspection, packaging, and warehousing;

[0013] The dyeing process is as follows:

[0014] (1) Place the qualified cashmere into a dyeing vat with a temperature of 30-40℃ and a liquor ratio of 1:7-9;

[0015] (2) Add 5-6% owf dyeing auxiliary agent to the dyeing vat. After 10-12 min, add 0.017% owf weak acid brilliant red-B and 0.021% ow weak acid brilliant red 10B dye. Continue to treat at 30-40℃ for 10-12 min. Then, raise the temperature to 85℃-90℃ at a rate of 1-2℃ / min and soak for 20-30 min. After taking it out, wash it with deionized water at 55-60℃ for 5-7 minutes. Rinse 3 times and drain.

[0016] The dyeing auxiliary agent is prepared by the following method:

[0017] (a) A diaphragmless electrolytic cell was used, with stainless steel as the cathode and graphite as the anode. The electrolyte consisted of 40-50 vol.% dimethylaminoethanol myristate, 20-30 vol.% 1,4-dichloroethane, and 0.1 mol / L tetrabutylammonium iodide as the supporting electrolyte. The remainder was a mixture of ethylene glycol and deionized water in a mass ratio of 4:1. The electrolysis parameters were: temperature 35-40℃, current density 8-9 mA / cm2, and time 3-4 h. The electrolyte was then discharged and subjected to vacuum distillation to remove organic solvents, resulting in a bisquaternary ammonium cationic surfactant solution.

[0018] (b) To the above-obtained quaternary ammonium cationic surfactant solution, polyethylene oxide-polypropylene oxide-polyethylene oxide, polyoxypropylene glycerol ether, hexanediol, polydimethylsiloxane, dipropylene glycol butyl ether, and deionized water are added sequentially to prepare a dyeing auxiliary agent. The dyeing auxiliary agent has the following composition by mass fraction:

[0019] 30-35 parts of a quaternary ammonium cationic surfactant solution;

[0020] 5-7 parts of polyethylene oxide-polypropylene oxide-polyethylene oxide;

[0021] 2-3 parts of polyoxypropylene glycerol ether;

[0022] 7-9 parts of hexanediol;

[0023] 1-2 parts of polydimethylsiloxane;

[0024] 1-2 parts of dipropylene glycol butyl ether;

[0025] 20-30 parts deionized water;

[0026] The pH was adjusted to 7.3-7.8 using citric acid to obtain the staining auxiliary agent.

[0027] The wool-smoothing agent used consists of 1.57% owf wool-smoothing oil, 0.62% owf antistatic agent, 0.32% owf strengthening agent, and 17.23% owf deionized water. It is then sent to the wool warehouse for fuzzing, which takes 12-16 hours.

[0028] The comb includes a first comb, a second comb, and a third comb.

[0029] Combed, with a draft ratio of 9.0, a spacing of 56mm, an output weight of 17.3g / m, and an output speed of 120m / min.

[0030] The roving uses a back zone draft ratio of 1.2, a total draft ratio of 7.5, a sliver weight of 0.2 g / m, and an output speed of 150 m / min.

[0031] The yarn has a draft ratio of 23.6 and a twist of 815 T / m.

[0032] The winding speed is 550 rpm.

[0033] Parallel alignment, 2 strands parallel, vehicle speed 550m / min, tension 30%.

[0034] The twisting speed is 18 rpm, the twist is 400 T / m, and the overfeed ratio is 1.4.

[0035] The raw materials used in this invention are self-made. First, myristic acid and sulfur oxychloride are used to perform an acylation reaction to form myristic acid chloride. Then, myristic acid chloride is reacted with DMEA to form dimethylaminoethanol myristicate. The obtained dimethylaminoethanol myristicate is used as a reaction raw material to prepare a quaternary ammonium cationic surfactant.

[0036] The specific preparation process is as follows:

[0037] A diaphragm-free electrolytic cell was used, with stainless steel as the cathode and graphite as the anode. The electrolyte consisted of 40-50 vol.% dimethylaminoethanol myristate, 20-30 vol.% 1,4-dichloroethane, and 0.1 mol / L tetrabutylammonium iodide as the supporting electrolyte, with the remainder being a 4:1 mass ratio of ethylene glycol to deionized water. The electrolysis parameters were: temperature 35-40℃, current density 8-9 mA / cm², and time 3-4 h. The electrolyte was then discharged, and the organic solvent was removed by vacuum distillation to obtain a bisquaternary ammonium cationic surfactant solution.

[0038] In the above process, firstly, dimethylaminoethanol myristate is oxidized at the anode, where the ammonia nitrogen is oxidized to ammonia ions, and then dichloroethane is activated and reduced at the cathode to obtain... ● CH2-CH2 ● Active groups, active ● CH2-CH2 ● It exhibits negative charge and attracts at least two ions at the anode to form a bis-quaternary ammonium cationic surfactant, which then forms a bis-quaternary ammonium cationic surfactant with chloride ions that migrate to the anode. The bis-quaternary ammonium cationic surfactant prepared by the above electrochemical method has extremely high purity and a conversion rate of over 95%. The process is simple, stable, and cost-effective.

[0039] Then, a rotary evaporator is used to remove the organic solvent, and the treated electrolyte is used as the precursor of the dyeing auxiliary agent of this invention.

[0040] A dyeing auxiliary agent was prepared by sequentially adding polyethylene oxide-polypropylene oxide-polyethylene oxide, polyoxypropylene glycerol ether, hexanediol, polydimethylsiloxane, dipropylene glycol butyl ether, and deionized water to the electrolyte obtained above.

[0041] The dyeing auxiliary agent is present in the following proportions by weight:

[0042] 30-35 parts of bisquaternary ammonium cationic surfactant electrolyte;

[0043] 5-7 parts of polyethylene oxide-polypropylene oxide-polyethylene oxide;

[0044] 2-3 parts polyoxypropylene glycerol ether;

[0045] 7-9 parts hexanediol;

[0046] 1-2 parts polydimethylsiloxane;

[0047] 1-2 parts dipropylene glycol butyl ether;

[0048] 20-30 parts deionized water.

[0049] The pH of the above solution was adjusted to 7.3-7.8 using citric acid to obtain the desired staining auxiliary agent.

[0050] The dyeing auxiliary agent has the properties of leveling, protecting fibers, and wetting and penetrating. In addition, the dyeing auxiliary agent must be safe and environmentally friendly, have a significant effect on dyeing dark cashmere, and can effectively reduce the pilling rate.

[0051] Regarding spinning, it includes cashmere inspection, raw material dyeing, wool blending, wool combing, carding, combing, drawing, roving, spinning, winding, doubling, twisting, yarn forming, yarn forming inspection, packaging, and warehousing.

[0052] The wool needs to be left to stand for 24 hours to allow the oil and water to spread evenly and penetrate into the fiber. The wool oiling agent is an oiling agent added to the wool fiber material during the wool spinning process, which can give the loose fiber smooth, soft and antistatic properties.

[0053] The functions of wool blending oil are: (1) Wool blending oil homogenizes the frictional properties of various raw materials, reduces the directional frictional effect of fibers, facilitates combing and mixing, and prevents cashmere from shrinking and producing fibers; (2) Wool blending oil can reduce the frictional force between fibers and guide rollers, prevent and eliminate static electricity generated by friction during processes such as drafting and twisting, and improve the cohesion of fiber bundles; (3) Since wool blending oil contains moisture, it can also reduce static electricity in fibers, prevent attraction and repulsion between fibers and between fibers and machine parts during production, thereby reducing fly fuzz and preventing phenomena such as scattering, entanglement, and breakage; (4) Wool blending oil can increase the softness of fibers, making the coefficient of friction of fibers close to the fluid friction of oil itself, giving fibers better softness, making them less prone to breakage under stress, and reducing fiber damage under mechanical force. In summary, wool blending oil can reduce fiber damage during the wool blending process and subsequent worsting process, thus allowing cashmere fibers to pass smoothly through various spinning equipment.

[0054] Carding: Employing a low-speed, low-feed, small-spaced, and low-drafting process, increasing the number of carding passes, the carding process relies primarily on the mutual pulling between the carding needles of the elastic card cloth to open and comb the fibers. Excessive speed can cause significant fiber damage, while excessive feed rate or insufficient space will overload the carding process, resulting in poor fiber opening, numerous fibers, and damage to both the fibers and the card cloth. Carding mainly combines and drafts the sliver exiting the carding machine, ensuring the fibers are parallel and straight, improving sliver uniformity, and providing sufficient weight to meet the processing requirements of the combing machine. Low speed, low feed rate, and low drafting reduce fiber damage, enhance sliver combing, and prevent excessive new fibers, thereby improving the quality indicators of the output sliver and ensuring smooth processing; small spacers reduce uncontrolled areas and improve sliver uniformity.

[0055] Combing: The raw material contains a certain amount of short fibers. After the previous processing steps, a large number of fibers are generated. If the short fibers and fibers are not removed, the finished yarn will have a lot of fuzz and fibers, resulting in uneven yarn count, evenness, strength, and twist, which seriously affects the appearance of the finished product. In order to remove most of the short fibers and fibers and increase the main fiber length, the overall fiber length is controlled to be above 48mm, and the number of fibers is below 5 per gram.

[0056] The roving is done on a vertical roving frame, which mainly controls fiber drafting through bubble rollers. The gripping force is uniform, and the unexpected drafting in the sliver section is small, which can improve the uniformity of the sliver. "Roving is a key link in perfecting the quality of the sliver. The machine condition is strictly adjusted when each batch of raw materials is loaded to ensure that the CV% of the roving is controlled within 6.5% to ensure the quality of the yarn in the subsequent process.

[0057] Yarn breakage is a critical technical issue, mostly caused by malfunctioning equipment. This can be due to factors such as an improper match between the size of the wire hook and the yarn linear density, or incomplete or rusted wire hooks. If the yarn itself has a low fiber count, the yarn tension will be too low to meet normal production requirements. Therefore, setting reasonable process parameters is crucial to reduce yarn breakage, save labor and raw materials, improve product quality, and lay the foundation for smooth subsequent processes. The quality of the fine yarn directly determines the quality of the finished yarn; therefore, ensuring the rationality of all process parameters in fine yarn production is paramount to guaranteeing yarn quality.

[0058] The winding process is an essential step in spinning, playing a crucial role in assessing and evaluating the quality of the entire batch of yarn. This process primarily involves using a yarn clearing device to remove impurities, fuzz, and defects such as coarse and fine lines from the yarn surface. This allows the yarn to be wound into a cone shape under a specific tension, meeting the requirements of the next production step. A key technical aspect is setting appropriate defect-cutting parameters. If these parameters are too high, many defects will be missed, severely impacting yarn quality and potentially causing irreparable damage to the fabric, leading to product downgrading. Conversely, setting parameters that are too low will result in frequent defect cutting by the clearing device, reducing production efficiency and also affecting yarn quality. Therefore, researching and setting reasonable defect-cutting parameters is extremely important.

[0059] During the doubling process, the yarn passes through an oiling device to reduce fuzz, increase strength, remove surface defects from the yarn, and create a larger, well-formed bobbin, facilitating the next twisting process. During production, it is crucial to ensure consistent tension between the two single yarns and to prevent the mixing of surrounding yarns, which could cause defects such as multiple strands.

[0060] The twisting process involves twisting two yarns together to obtain a ply with a specific twist. It's crucial to control the tension evenly and avoid creating a loose or tight twist. The purpose of the doubling twist process is to improve the utilization rate of single yarn fiber strength, enhance the yarn's elasticity and softness, improve yarn evenness, and increase the uniformity of twist.

[0061] (1) A quaternary ammonium cationic surfactant solution in the dyeing auxiliary was prepared by electrochemical process and then configured as a dyeing auxiliary. The dyeing auxiliary has a high dyeing rate for dark dyes, bright color, low weight loss, high strength, low yarn loss, and high spinning yield of the produced products. While obtaining excellent products, it reduces energy consumption and improves production efficiency.

[0062] (2) The yarn has a uniformity variation coefficient of 9.68%, a breaking strength of 292 cN, a strength of cN / tex of 11.8, an elongation of 113 mm, an elongation rate of 23.02%, a pilling grade of ≥3.5, and excellent physical and chemical properties. Implementation

[0063] The processes used in the embodiments of the present invention and Comparative Example 1 are cashmere inspection, raw material dyeing, wool blending, wool combing, carding, combing, drawing, roving, spinning, winding, doubling, twisting, yarn forming, yarn forming inspection, packaging, and warehousing.

[0064] The wool finishing agent used consists of 1.57% owf wool finishing oil, 0.62% owf antistatic agent, 0.32% owf strengthening agent, and 17.23% owf deionized water. It is then sent to the wool warehouse for annealing for 12-16 hours.

[0065] Pin combs include first-row pin combs, second-row pin combs, and third-row pin combs.

[0066] Combed, with a draft ratio of 9.0, a spacing of 56mm, an output weight of 17.3g / m, and an output speed of 120m / min.

[0067] The roving uses a back zone draft ratio of 1.2, a total draft ratio of 7.5, a sliver weight of 0.2 g / m, and an output speed of 150 m / min.

[0068] The yarn has a draft ratio of 23.6 and a twist of 815 T / m.

[0069] The winding speed is 550 rpm.

[0070] Parallel alignment, 2 strands parallel, vehicle speed 550m / min, tension 30%.

[0071] The twisting speed is 18 rpm, the twist is 400 T / m, and the overfeed ratio is 1.4.

[0072] The main difference lies in the dyeing auxiliaries. Example

[0073] A spinning process for anti-pilling cashmere yarn includes cashmere inspection, raw material dyeing, wool blending, wool combing, carding, combing, drawing, roving, spinning, winding, doubling, twisting, yarn forming, yarn forming inspection, packaging, and warehousing.

[0074] The dyeing process is as follows:

[0075] (1) Place the qualified cashmere into a dyeing vat with a temperature of 30℃ and a liquor ratio of 1:7;

[0076] (2) Add 5% owf dyeing auxiliary agent to the dyeing vat. After 10 min, add 0.017% owf weak acid brilliant red-B and 0.021% ow weak acid brilliant red 10B dye. Continue to treat at 30℃ for 10 min. Then raise the temperature to 85℃ at a rate of 1℃ / min and soak for 20 min. After taking it out, wash it with 55℃ deionized water for 5 min. Rinse 3 times and drain.

[0077] The dyeing auxiliary agent is prepared by the following method:

[0078] (a) A diaphragmless electrolytic cell was used, with stainless steel as the cathode and graphite as the anode. The electrolyte consisted of 40 vol.% dimethylaminoethanol myristate, 20 vol.% 1,4-dichloroethane, and 0.1 mol / L tetrabutylammonium iodide as the supporting electrolyte, with the remainder being a 4:1 mass ratio of ethylene glycol to deionized water. The electrolysis parameters were: temperature 35°C, current density 8 mA / cm². 2 The time was 3 hours. Then the electrolyte was exported and the organic solvent was removed by vacuum distillation to obtain a bisquaternary ammonium cationic surfactant solution.

[0079] (b) To the above-obtained quaternary ammonium cationic surfactant solution, polyethylene oxide-polypropylene oxide-polyethylene oxide, polyoxypropylene glycerol ether, hexanediol, polydimethylsiloxane, dipropylene glycol butyl ether, and deionized water are added sequentially to prepare a dyeing auxiliary agent. The dyeing auxiliary agent has the following composition by mass fraction:

[0080] 30 parts of a quaternary ammonium cationic surfactant solution;

[0081] 5 parts of polyethylene oxide-polypropylene oxide-polyethylene oxide;

[0082] 2 parts of polyoxypropylene glycerol ether;

[0083] 7 parts hexanediol;

[0084] 1 part of polydimethylsiloxane;

[0085] 1 part of dipropylene glycol butyl ether;

[0086] 20 parts deionized water;

[0087] The pH was adjusted to 7.3 using citric acid to obtain the staining auxiliary agent. Example

[0088] A spinning process for anti-pilling cashmere yarn includes cashmere inspection, raw material dyeing, wool blending, wool combing, carding, combing, drawing, roving, spinning, winding, doubling, twisting, yarn forming, yarn forming inspection, packaging, and warehousing.

[0089] The dyeing process is as follows:

[0090] (1) Place the qualified cashmere into a dyeing vat with a temperature of 35℃ and a liquor ratio of 1:8;

[0091] (2) Add 5.5% owf dyeing auxiliary agent to the dyeing vat. After 11 min, add 0.017% owf weak acid brilliant red-B and 0.021% ow weak acid brilliant red 10B dye. Continue to treat at 35℃ for 11 min. Then raise the temperature to 87.5℃ at a rate of 1.5℃ / min and soak for 25 min. After taking it out, wash it with 55℃ deionized water for 6 minutes. Rinse 3 times and drain.

[0092] The dyeing auxiliary agent is prepared by the following method:

[0093] (a) A diaphragmless electrolytic cell was used, with stainless steel as the cathode and graphite as the anode. The electrolyte consisted of 45 vol.% dimethylaminoethanol myristate, 25 vol.% 1,4-dichloroethane, and 0.1 mol / L tetrabutylammonium iodide as the supporting electrolyte, with the remainder being a 4:1 mass ratio of ethylene glycol to deionized water. The electrolysis parameters were: temperature 37.5 °C and current density 8.5 mA / cm². 2 The time was 3.5 h, and then the electrolyte was exported. The organic solvent was removed by vacuum distillation of the electrolyte to obtain a bisquaternary ammonium cationic surfactant solution.

[0094] (b) To the obtained quaternary ammonium cationic surfactant solution, polyethylene oxide-polypropylene oxide-polyethylene oxide, polyoxypropylene glycerol ether, hexanediol, polydimethylsiloxane, dipropylene glycol butyl ether, and deionized water are added sequentially to prepare a dyeing auxiliary agent. The dyeing auxiliary agent has the following composition by mass fraction:

[0095] 32.5 parts of a quaternary ammonium cationic surfactant solution;

[0096] Six parts of polyethylene oxide-polypropylene oxide-polyethylene oxide;

[0097] 2.5 parts of polyoxypropylene glycerol ether;

[0098] 8 parts hexanediol;

[0099] 1.5 parts of polydimethylsiloxane;

[0100] 1.5 parts of dipropylene glycol butyl ether;

[0101] 25 parts deionized water;

[0102] The pH was adjusted to 7.5 using citric acid to obtain the staining auxiliary agent. Example

[0103] A spinning process for anti-pilling cashmere yarn includes cashmere inspection, raw material dyeing, wool blending, wool combing, carding, combing, drawing, roving, spinning, winding, doubling, twisting, yarn forming, yarn forming inspection, packaging, and warehousing.

[0104] The dyeing process is as follows:

[0105] (1) Place the qualified cashmere into a dyeing vat with a temperature of 40℃ and a liquor ratio of 1:9;

[0106] (2) Add 6% owf dyeing auxiliary agent to the dyeing vat. After 12 min, add 0.017% owf weak acid brilliant red-B and 0.021% ow weak acid brilliant red 10B dye. Continue to treat at 40℃ for 12 min. Then raise the temperature to 90℃ at a rate of 2℃ / min and soak for 30 min. After taking it out, wash it with deionized water at 60℃ for 7 minutes. Rinse 3 times and drain.

[0107] The dyeing auxiliary agent is prepared by the following method:

[0108] (a) A diaphragmless electrolytic cell was used, with stainless steel as the cathode and graphite as the anode. The electrolyte consisted of 50 vol.% dimethylaminoethanol myristate, 30 vol.% 1,4-dichloroethane, and 0.1 mol / L tetrabutylammonium iodide as the supporting electrolyte, with the remainder being a 4:1 mass ratio of ethylene glycol to deionized water. The electrolysis parameters were: temperature 40 °C, current density 9 mA / cm². 2 The time was 4 hours. Then the electrolyte was exported and the organic solvent was removed by vacuum distillation to obtain a quaternary ammonium cationic surfactant solution.

[0109] (b) To the obtained quaternary ammonium cationic surfactant solution, polyethylene oxide-polypropylene oxide-polyethylene oxide, polyoxypropylene glycerol ether, hexanediol, polydimethylsiloxane, dipropylene glycol butyl ether, and deionized water are added sequentially to prepare a dyeing auxiliary agent. The dyeing auxiliary agent has the following composition by mass fraction:

[0110] 35 parts of a quaternary ammonium cationic surfactant solution;

[0111] 7 parts of polyethylene oxide-polypropylene oxide-polyethylene oxide;

[0112] 3 parts of polyoxypropylene glycerol ether;

[0113] 9 parts hexanediol;

[0114] 2 parts of polydimethylsiloxane;

[0115] 2 parts of dipropylene glycol butyl ether;

[0116] 30 parts deionized water;

[0117] The pH was adjusted to 7.8 using citric acid to obtain the staining auxiliary agent.

[0118] Comparative Example 1

[0119] The process is completely consistent with that in Example 2, except that the dyeing auxiliary used is the reactive dye auxiliary, Senazine dyeing auxiliary WH.

[0120] A spinning process for anti-pilling cashmere yarn includes cashmere inspection, raw material dyeing, wool blending, wool combing, carding, combing, drawing, roving, spinning, winding, doubling, twisting, yarn forming, yarn forming inspection, packaging, and warehousing.

[0121] The dyeing process is as follows:

[0122] (1) Place the qualified cashmere into a dyeing vat with a temperature of 35℃ and a liquor ratio of 1:8;

[0123] (2) Add 2% owf dyeing auxiliary WH to the dyeing vat. After 11 min, add 0.017% owf weak acid brilliant red-B and 0.021% ow weak acid brilliant red 10B dye. Continue to treat at 35℃ for 11 min. Then, raise the temperature to 87.5℃ at a rate of 1.5℃ / min and soak for 25 min. After taking it out, wash it with 55℃ deionized water for 6 minutes. Rinse 3 times and drain.

[0124] The dyed cashmere of Example 2 was tested. The coefficient of kinetic friction (with scales) of the dyed cashmere obtained in Example 2 was 0.3017, the coefficient of kinetic friction (against scales) was 0.3527, the coefficient of static friction (with scales) was 0.4139, and the coefficient of static friction (against scales) was 0.4401. In comparison, the coefficient of kinetic friction (with scales) of cashmere in Comparative Example 1 was 0.3278, the coefficient of kinetic friction (against scales) was 0.3977, the coefficient of static friction (with scales) was 0.4378, and the coefficient of static friction (against scales) was 0.4596. It can be concluded that the coefficient of friction of the dyed cashmere of Example 2 is reduced and is significantly lower than that of Comparative Example 1. Further resistivity tests were conducted on Example 2 and Comparative Example 1. The resistivity Lg (Ω·g / cm2) of the dyed cashmere in Example 2 was 9.49, and the resistivity Lg (Ω·g / cm2) of the dyed cashmere in Comparative Example 2 was also lower. With a coefficient of friction of 10.21, the low resistivity of cashmere reduces static electricity generation during subsequent spinning, thus reducing problems such as clogging, roller wrapping, and pilling.

[0125] The yarn product of Example 2 was then characterized. It was red in color, with a coefficient of variation of yarn evenness of 9.68%, a breaking strength of 292 cN, a strength of cN / tex of 11.8, an elongation of 113 mm, an elongation rate of 23.02%, and a pilling grade of ≥3.5. Its performance was far superior to that of the cashmere product of Comparative Document 1.

[0126] The above description of the embodiments is only for the purpose of helping to understand the method and core ideas of the present invention. It should be noted that those skilled in the art can make appropriate modifications to the present invention based on the principles of the present invention, and these appropriate modifications should also be within the protection scope of the claims of the present invention.

Claims

1. A spinning process of anti-pilling cashmere yarn characterized in that The process includes the following steps: cashmere inspection, raw material dyeing, wool blending, wool combing, carding, combing, drawing, roving, spinning, winding, doubling, twisting, yarn forming, yarn inspection, packaging, and warehousing. The dyeing process is as follows: (1) Place the qualified cashmere into a dyeing vat with a temperature of 30-40℃ and a liquor ratio of 1:7-9; (2) Add 5-6% owf dyeing auxiliary agent to the dyeing vat. After 10-12 min, add 0.017% owf weak acid brilliant red-B and 0.021% owf weak acid brilliant red-10B dye. Continue to treat at 30-40℃ for 10-12 min. Then, raise the temperature to 85℃-90℃ at a rate of 1-2℃ / min and soak for 20-30 min. After taking it out, wash it with deionized water at 55-60℃ for 5-7 minutes. Rinse 3 times and drain. The dyeing auxiliary agent is prepared by the following method: (a) using a diaphragmless electrolytic cell, taking stainless steel as cathode, graphite as anode, electrolyte being 40-50 vol.% dimethylaminoethanol myristate, 20-30 vol.% 1,2-dichloroethane, 0.1 mol / L tetrabutylammonium iodide as supporting electrolyte, the rest being a mixture of ethylene glycol and deionized water with a mass ratio of 4:1, electrolysis parameters being temperature 35-40℃, current density 8-9 mA / cm 2 , time 3-4 h, then leading out the electrolyte, removing organic solvents from the electrolyte by vacuum distillation to obtain a solution of the obtained diquaternary ammonium cationic surfactant; (b) To the above-obtained quaternary ammonium cationic surfactant solution, polyethylene oxide-polypropylene oxide-polyethylene oxide, polyoxypropylene glycerol ether, hexanediol, polydimethylsiloxane, dipropylene glycol butyl ether, and deionized water are added sequentially to prepare a dyeing auxiliary agent. The dyeing auxiliary agent has the following composition by mass fraction: 30-35 parts of a quaternary ammonium cationic surfactant solution; 5-7 parts of polyethylene oxide-polypropylene oxide-polyethylene oxide; 2-3 parts of polyoxypropylene glycerol ether; 7-9 parts of hexanediol; 1-2 parts of polydimethylsiloxane; 1-2 parts of dipropylene glycol butyl ether; 20-30 parts deionized water; The pH was adjusted to 7.3-7.8 using citric acid to obtain the staining auxiliary agent; The wool-smoothing agent used consists of 1.57% owf wool-smoothing oil, 0.62% owf antistatic agent, 0.32% owf strengthening agent, and 17.23% owf deionized water. It is then sent to the wool warehouse for fuzzing for 12-16 hours.

2. The spinning process for an anti-pilling cashmere yarn as described in claim 1, characterized in that, The comb includes a first comb, a second comb, and a third comb.

3. The spinning process for an anti-pilling cashmere yarn as described in claim 1, characterized in that, The combing draw ratio is 9.0, the spacing is 56 mm, the sliver weight is 17.3 g / m, and the sliver speed is 120 m / min.

4. The spinning process for anti-pilling cashmere yarn as described in claim 1, characterized in that, The roving uses a back zone draft ratio of 1.2, a total draft ratio of 7.5, a sliver weight of 0.2 g / m, and an output speed of 150 m / min.

5. The spinning process for an anti-pilling cashmere yarn as described in claim 1, characterized in that, The yarn has a draft ratio of 23.6 and a twist of 815 T / m.

6. The spinning process for anti-pilling cashmere yarn as described in claim 1, characterized in that, The winding speed is 550 rpm.

7. The spinning process for an anti-pilling cashmere yarn as described in claim 1, characterized in that... Parallel operation, 2 strands parallel, vehicle speed 550 m / min, tension 30%.

8. The spinning process for an anti-pilling cashmere yarn as described in claim 1, characterized in that, The twisting speed is 18 rpm, the twist is 400 T / m, and the overfeed ratio is 1.4.