Anti-pilling cashmere yarn and preparation method thereof

Abstract

The invention relates to the field of textile materials, and particularly discloses an anti-pilling cashmere yarn and a preparation method thereof. The invention relates to a preparation method of an anti-pilling cashmere yarn. The preparation method comprises the following steps: S1, cotton blending: carrying out cotton blending on Raccoon raw cashmere, Cashmer white cashmere, vicose and nylon in a weight ratio of (30-35): (30-35): (15-20): (15-20); s2, opening cotton; s3, plucking cotton; s4, opening and removing impurities; s5, cotton carding; s7, drafting; s8, twisting is conducted; s9, spooling is conducted; s10, galling is carried out; and S11, forming is conducted. The anti-pilling cashmere yarn is good in hand feeling, fluffy and smooth, good in skin-friendly performance and anti-pilling effect, capable of achieving the anti-pilling effect of 3 levels or above in a test, the air permeability is not lower than 1240 mm / s, and the size change rate is smaller than 1.2%.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of textile materials, and in particular to an anti-pilling cashmere yarn and a preparation method thereof. BACKGROUND

[0002] Cashmere yarn is widely used in high-end textiles due to its softness and warmth, but the surface fibers are prone to pilling due to friction, affecting the appearance and service life. This is because the surface of cashmere fibers is covered with tile-shaped scales (cutin layer), and the edges of the scales are zigzag. When the fibers are rubbed, these scales will hook each other, producing directional friction effect. The fibers always slide to the root of the scale and are difficult to return. The frictional force makes the fiber tips pull out of the yarn, forming surface fluff. The staggered structure of the scales hinders the shrinkage of the fluff, resulting in continuous exposure of the fluff; the breaking strength of cashmere is relatively low but the curling degree is relatively high, so the fibers are prone to breakage but difficult to fall off during friction; static charges are generated during cashmere friction, which adsorb dust and adjacent fibers in the environment, forming a "fiber-dust-fiber" entanglement core. The exposed fluff undergoes longitudinal torsion, multi-fiber spiral winding and ball compaction in the process of continuous friction. Therefore, the fiber morphology characteristics of cashmere and the friction mechanics behavior jointly cause cashmere to be more prone to pilling than other products.

[0003] In the prior art, anti-pilling treatment mainly adopts the following methods: physical brush method: removing loose surface fibers by mechanical brushing, but the fibers are easily damaged and the effect is not durable; resin finishing method: increasing the adhesion between fibers by coating resin, but the softness of cashmere is reduced. However, in recent years, with the increasing demand of consumers for high-quality textiles, the above methods have been unable to meet the needs of consumers, and therefore the development of products with both natural characteristics of cashmere and excellent anti-pilling performance has become a research hotspot in the industry. SUMMARY

[0004] To solve the above technical problems, the present application provides an anti-pilling cashmere yarn and a preparation method thereof.

[0005] In a first aspect, the present application provides a preparation method of an anti-pilling cashmere yarn, comprising the following steps: S1. Blending: blending Raccoon raw cashmere, Cashmere white cashmere, viscose and nylon in a weight ratio of (30-35):(30-35):(15-20):(15-20); S2. Opening the cotton; S3. Grabbing the cotton; S4. Opening and removing impurities; S5. Carding; S6. Doubling: the delivery speed is 300 m / min, 8 roots are combined in the first pass, and 8 roots are combined in the last pass, the delivery weight of the first pass is 21±0.3 g / 5 m, the delivery weight of the last pass is 22±0.2 g / 5 m, the draft ratio of the first pass is 1.7-1.8, and the draft ratio of the last pass is 1.3-1.4; S7. Drafting: the delivery speed is 24-28 m / min, the total draft ratio is 6.3-6.5, and the draft ratio of the rear zone is 1.2-1.3; S8. Twisting: the hollow twist is 570-800 T / M, the ring twist is 200-236 T / M, the draft ratio is 9-12.6, and the untwist coefficient is 0.49-0.70; S9. Winding; S10. Drawing; S11. Forming.

[0006] Preferably, in S1, the weight ratio of Raccoon raw wool, Cashmere white wool, viscose and nylon is 30:30:20:20.

[0007] By adopting the above technical scheme, the present application uses a certain proportion of Raccoon raw wool, Cashmere white wool, viscose and nylon as raw materials, wherein the Raccoon raw wool has good hand feeling, is fluffy and smooth, can provide good skin friendliness for anti-pilling cashmere yarn, the Cashmere white has low short wool rate and belongs to cashmere with an average length of more than 35 mm, which can effectively reduce the falling of short wool, the viscose belongs to viscose fiber, has the hand feeling of cashmere and high moisture absorption, makes the overall moisture regain of the yarn high, reduces the static electricity occurrence rate, and is helpful for anti-pilling, and the nylon increases the strength of the overall anti-pilling cashmere yarn and avoids the influence of finishing on the weaving strength.

[0008] After the above Raccoon raw wool, Cashmere white wool, viscose and nylon are subjected to cotton mixing, opening, grabbing, opening and impurity removal, carding, doubling, drafting, twisting, winding, drawing and forming, the anti-pilling cashmere yarn with good anti-pilling effect can be obtained, the anti-pilling effect of more than 3 levels can be achieved in the test, the air permeability is not less than 1240 mm / s, and the dimensional change rate is less than 1.2%.

[0009] Preferably, in S2, the specific operation is as follows: The fiber obtained after cotton mixing is sprayed with a conditioning agent at a moisture regain of 13-15%, and the cotton is opened after standing for 48 h, wherein the conditioning agent comprises wool oil, antistatic agent and water at a weight ratio of 1: (1.2-1.8):15.

[0010] Preferably, the antistatic agent is an ionic liquid antistatic agent, and the anion in the ionic liquid antistatic agent includes any one of tetrafluoroborate ion, hexafluorophosphate ion, and bis(trifluoromethanesulfonyl)imide ion.

[0011] Preferably, the anion in the ionic liquid antistatic agent is a bis(trifluoromethanesulfonyl)imide ion.

[0012] By adopting the above technical solution, this application sprays a conditioning agent onto the fibers obtained after blending cotton. The conditioning agent includes an ionic liquid antistatic agent, which has a certain water absorption capacity. After migrating to the substrate surface, it absorbs moisture and forms a thin layer of water on the substrate surface to conduct electricity. On the other hand, the anions and cations in the ionic liquid form a uniform charge balance layer on the fiber surface, effectively neutralizing the static charge on the fiber surface, reducing the static adsorption between fibers, and significantly reducing the surface resistance of cashmere yarn, while hardly affecting its mechanical properties.

[0013] Preferably, in step S2, the conditioning agent is sprayed onto the fibers obtained after blending using a segmented spraying method, specifically as follows: Apply the conditioning agent to the fibers obtained after blending cotton with a moisture regain of 13-15%. During the first spraying, only 60-70 wt% of the antistatic agent is sprayed. After standing for 12 hours, the remaining antistatic agent is sprayed.

[0014] By adopting the above technical solution, this application uses a segmented spraying process, first pre-treating with a low concentration of antistatic agent, and then performing a secondary treatment with a high concentration of antistatic agent to further optimize the electrostatic shielding effect.

[0015] Preferably, the Raccoon raw cotton in S1 undergoes a protein padding treatment before being blended with Cashmere white cotton, Viscose, and Nylon, specifically: Raccoon raw fibers are impregnated with a collagen aqueous solution with a concentration of 10-30 g / L to achieve a liquid-carrying rate of 100%. The Raccoon raw fibers are then dried to obtain pretreated Raccoon raw fibers. The collagen in the collagen aqueous solution has a molecular weight of 1300, 1700 or 10000.

[0016] Preferably, the concentration of the collagen aqueous solution is 20 g / L.

[0017] Preferably, the collagen has a molecular weight of 1700.

[0018] By employing the above technical solution, this application utilizes a collagen aqueous solution to impregnate Raccoon cashmere. Collagen has adhesive properties, enabling it to adhere to the scale layer on the surface of Raccoon cashmere. When the fiber is subjected to friction, the phenomenon of scales hooking onto each other is greatly reduced, the directional friction effect almost disappears, and the number of surface fibers is significantly reduced. Therefore, the anti-pilling effect of the final anti-pilling cashmere yarn is significantly improved. This application also controls the concentration of the collagen aqueous solution and the molecular weight of collagen to balance the anti-pilling ability, air permeability, and dimensional stability of the anti-pilling cashmere yarn as much as possible.

[0019] Secondly, this application also provides an anti-pilling cashmere yarn prepared by the above-mentioned method for preparing anti-pilling cashmere yarn.

[0020] By adopting the above technical solution, the anti-pilling cashmere yarn of this application is obtained by blending, opening, picking, loosening and removing impurities from Raccoon raw cashmere, Cashmere white cashmere, viscose and nylon, carding, drawing, stretching, twisting, winding, napping and forming. In the test, it can achieve an anti-pilling effect of level 3 or above, with an air permeability of not less than 1240mm / s and a dimensional change rate of <1.2%.

[0021] In summary, this application has the following beneficial technical effects: 1. The anti-pilling cashmere yarn of this application is obtained by blending, opening, picking, loosening and removing impurities from the above-mentioned Raccoon raw cashmere, Cashmere white cashmere, Viscose and nylon, followed by drawing, stretching, twisting, winding, napping and forming. In the test, it can achieve an anti-pilling effect of level 3 or above, an air permeability of not less than 1240mm / s, and a dimensional change rate of <1.2%; 2. This application involves spraying a conditioning agent onto the fibers obtained after blending cotton. The conditioning agent includes an ionic liquid antistatic agent, which has a certain water absorption capacity. After migrating to the surface of the substrate, it absorbs moisture and forms a thin layer of water on the substrate surface to conduct electricity. On the other hand, the anions and cations in the ionic liquid form a uniform charge balance layer on the fiber surface, effectively neutralizing the static charge on the fiber surface, reducing the electrostatic adsorption between fibers, and significantly reducing the surface resistance of the cashmere yarn while hardly affecting its mechanical properties. 3. In this application, a collagen aqueous solution was used to impregnate Raccoon cashmere. Collagen has adhesive properties and can adhere to the scale layer on the surface of Raccoon cashmere. When the fiber is rubbed, the phenomenon of scales hooking each other is greatly reduced, the directional friction effect almost disappears, and the number of surface fibers is also significantly reduced. Therefore, the anti-pilling effect of the final anti-pilling cashmere yarn can be significantly improved. Detailed Implementation

[0022] Material source Unless otherwise specified, all raw materials used in this application are commercially available products, specifically: Raccoon raw wool, originating from Hebei, with a fineness of 15.91, 25.77, and 35.84, averaging 15.84. The coarse wool rate is 0.1%, the average length is 35.18 mm, the standard deviation is 13.51 nn, the length dispersion coefficient is 38.4%, the 20 mm short wool rate is 14.03%, and there are a few cavity hairs per 1000 hairs. Cashmere white down, originating from Xilin Gol, fineness 1 is 16.47, fineness 2 is 16.31, fineness 3 is 16.5, average fineness is 15.75 for wool, 16.43 for down, and 16.52 for mixed fibers, coarse wool rate is 0.1%, average length is 35.4mm, standard deviation is 16.51nn, length dispersion coefficient is 46.64%, 20mm short down rate is 11.72%, a few visible cavities (2 hairs / 1543 hairs). Viscose, purchased from Bayer, Germany, with a fineness of 2.5D*38; Nylon, with a fineness of 2.5D*51; Cationic internal antistatic agent, brand name FX-18N.

[0023] The present application will be further described in detail below with reference to embodiments and comparative examples.

[0024] Preparation Example 1 A method for preparing ionic liquid antistatic agents includes the following steps: 300g of [MTMA]Cl and 900mL of isopropanol were heated to 70℃ and reacted while a large amount of N2 was introduced. After 1 hour, 4.5g of AIBN was added to continue the reaction. After 24 hours, the reaction was stopped, the temperature was raised to 100℃, and the isopropanol distilled from the system was recovered by condensation. When no more isopropanol dripped out, water at 60℃ was added, and the system gradually dissolved. 456.1g of LiTFSI was dissolved in water to form a salt solution, and the salt solution was slowly added to the system. The N2 was removed, and the mixture was stirred at 25℃ for 48 hours to obtain a viscous solid. The solid was washed three times with cold water, and then dissolved in hot water. The solution was poured out and dried at 100℃ to obtain a slightly yellow solid, which was designated as TFSI-ionic liquid antistatic agent.

[0025] Preparation Example 2 A method for preparing ionic liquid antistatic agents includes the following steps: 300g of [MTMA]Cl and 900mL of isopropanol were heated to 70℃ and reacted while a large amount of N2 was introduced. After 1 hour, 4.5g of AIBN was added to continue the reaction. After 24 hours, the reaction was stopped, the temperature was raised to 100℃, and the isopropanol distilled from the system was condensed and recovered. When no more isopropanol dripped out, water at 60℃ was added, and the system gradually dissolved. 475.6g of NaBF4 was dissolved in water to form a salt solution, and the salt solution was slowly added to the system. The N2 was removed, and the mixture was stirred at 25℃ for 48 hours to obtain a viscous solid. The solid was washed three times with cold water, and then dissolved in hot water and poured out. The solid was dried at 100℃ to obtain a slightly yellow solid, which was designated as BF4-ionic liquid antistatic agent.

[0026] Preparation Example 3 A method for preparing ionic liquid antistatic agents includes the following steps: 300g of [MTMA]Cl and 900mL of isopropanol were heated to 70℃ and reacted while a large amount of N2 was introduced. After 1 hour, 4.5g of AIBN was added to continue the reaction. After 24 hours, the reaction was stopped, the temperature was raised to 100℃, and the isopropanol distilled from the system was condensed and recovered. When no more isopropanol dripped out, water at 60℃ was added, and the system gradually dissolved. 797.2g of KPF6 was dissolved in water to form a salt solution, and the salt solution was slowly added to the system. The N2 was removed, and the mixture was stirred at 25℃ for 48 hours to obtain a viscous solid. The solid was washed three times with cold water, and then dissolved in hot water. The solid was poured out and dried at 100℃ to obtain a slightly yellow solid, which was designated as PF6-ionic liquid antistatic agent.

[0027] Example 1 A method for preparing anti-pilling cashmere yarn includes the following steps: S1. Blended cotton: Raccoon raw fleece, Cashmere white fleece, viscose and nylon are blended in a weight ratio of 30:30:20:20; S2. Cotton opening: Spray conditioning agent on the fibers obtained after blending at a moisture regain of 15%. After standing for 48 hours, put the blended fibers into a JLBC263 cotton opening machine. The conditioning agent includes wool oil, cationic internal antistatic agent and water in a weight ratio of 1:1.2:15. S3. Cotton grabbing: The fibers are put into the A002D cotton grabbing machine to reduce the uneven color of the final yarn product and prepare it for carding; S4. Opening and impurity removal: The fibers are put into the FA106 opening and impurity removal machine for combing and impurity removal, which removes the short fibers and impurities, ensuring the quality of the roving in the later stage and the evenness of the final product, and reducing the occurrence of grass burrs and other impurities in animal fibers. S5. Carding: The fibers are put into the HSD-961AC carding sliver equipment for carding, making the sliver more uniform and of better quality; S6. Drawing: The fiber passes through an FA306 self-leveling drawing frame in the first pass and then through a computer-controlled self-leveling drawing frame in the last pass. The sliver speed is 300m / min. 8 slivers are drawn together in the first pass and 8 slivers are drawn together in the last pass. The sliver weight in the first pass is 21±0.3g / 5m, and the sliver weight in the last pass is 22±0.2g / 5m. The nip spacing in the first pass is 20mm*30mm, and the nip spacing in the last pass is 20mm*30mm. The traction ratio in the first pass is 1.7, and the traction ratio in the last pass is 1.3. S7. Drafting: The fiber is placed on an FA458G computer roving frame for drafting. The specification is 6g / m, the output speed is 24m / min, the twist is 226T / M, the basis weight is 6 pieces / 10m, the total draft ratio is 6.5, and the back zone draft ratio is 1.3. S8. Twisting: The fiber is twisted with a hollow twist of 800T / M, a ring twist of 236T / M, a draft ratio of 9, an overfeed ratio of 1.56, an output roller coefficient of 1, a core roller coefficient of 1.04, an untwisting coefficient of 0.70, a twist direction of Z, and a roller spacing of 9mm*30mm*38mm. S9. Winding: The pre-formed yarn is placed in a GA series winding machine for winding, minimizing tension plates, preventing balling, and preventing uneven yarn thickness. S10. Raising: The yarn is placed in a KDF20 high-speed raising machine for raising treatment. The raising factor is 5.0, the number of raising turns is 12, the spinning speed is 150m / min, and the working roller spacing is 15 / 1000-9 / 1000 inches, depending on the yarn count, overfeed, raw material composition, style after raising, and raising factor. S11. Shaping: The yarn is wound into a roving with tapered ends to obtain anti-pilling cashmere yarn.

[0028] Example 2 A method for preparing anti-pilling cashmere yarn includes the following steps: S1. Blended cotton: Raccoon raw fleece, Cashmere white fleece, viscose and nylon are blended in a weight ratio of 35:35:15:15; S2. Cotton opening: Spray conditioning agent on the fibers obtained after blending at a moisture regain of 13%. After standing for 48 hours, put the blended fibers into a JLBC263 cotton opening machine. The conditioning agent includes wool oil, cationic internal antistatic agent and water in a weight ratio of 1:1.8:15. S3. Cotton grabbing: The fibers are put into the A002D cotton grabbing machine to reduce the uneven color of the final yarn product and prepare it for carding; S4. Opening and impurity removal: The fibers are put into the FA106 opening and impurity removal machine for combing and impurity removal, which removes the short fibers and impurities, ensuring the quality of the roving in the later stage and the evenness of the final product, and reducing the occurrence of grass burrs and other impurities in animal fibers. S5. Carding: The fibers are put into the HSD-961AC carding sliver equipment for carding, making the sliver more uniform and of better quality; S6. Drawing: The fiber passes through an FA306 self-leveling drawing frame in the first pass and then through a computer-controlled self-leveling drawing frame in the last pass. The sliver speed is 300m / min. 8 slivers are drawn together in the first pass and 8 slivers are drawn together in the last pass. The sliver weight in the first pass is 21±0.3g / 5m, and the sliver weight in the last pass is 22±0.2g / 5m. The nip spacing in the first pass is 20mm*30mm, and the nip spacing in the last pass is 20mm*30mm. The traction ratio in the first pass is 1.8, and the traction ratio in the last pass is 1.4. S7. Drafting: The fiber is placed on an FA458G computer roving frame for drafting. The specification is 6g / m, the output speed is 28m / min, the twist is 226T / M, the basis weight is 6 pieces / 10m, the total draft ratio is 6.3, and the back zone draft ratio is 1.2. S8. Twisting: The fiber is twisted with a hollow twist of 570T / M, a ring twist of 200T / M, a draw ratio of 12.6, an overfeed of 1.56, an output roller coefficient of 1, a core roller coefficient of 1.04, an untwisting coefficient of 0.49, a twist direction of Z, and a roller spacing of 9mm*30mm*38mm. S9. Winding: The pre-formed yarn is placed in a GA series winding machine for winding, minimizing tension plates, preventing balling, and preventing uneven yarn thickness. S10. Raising: The yarn is placed in a KDF20 high-speed raising machine for raising treatment. The raising factor is 5.0, the number of raising turns is 12, the spinning speed is 150m / min, and the working roller spacing is 15 / 1000-9 / 1000 inches, depending on the yarn count, overfeed, raw material composition, style after raising, and raising factor. S11. Shaping: The yarn is wound into a roving with tapered ends to obtain anti-pilling cashmere yarn.

[0029] Example 3 A method for preparing anti-pilling cashmere yarn differs from Example 1 in that the cationic internal antistatic agent in S2 is replaced with the TFSI-ionic liquid antistatic agent prepared in Example 1, while the rest is the same as in Example 1.

[0030] Example 4 A method for preparing anti-pilling cashmere yarn differs from Example 1 in that the cationic internal antistatic agent in S2 is replaced with the BF4-ionic liquid antistatic agent obtained in Preparation Example 1, while the rest is the same as in Example 1.

[0031] Example 5 A method for preparing anti-pilling cashmere yarn differs from Example 1 in that the cationic internal antistatic agent in S2 is replaced with the PF6-ionic liquid antistatic agent prepared in Example 1, while the rest is the same as in Example 1.

[0032] Example 6 A method for preparing anti-pilling cashmere yarn differs from Example 3 in that, in S2, a segmented spraying method is used to spray the conditioning agent onto the fibers obtained after blending cotton. In the first spraying process, only 70wt% of antistatic agent is sprayed, and after standing for 12 hours, the remaining antistatic agent is sprayed. The rest is the same as in Example 3.

[0033] Example 7 A method for preparing anti-pilling cashmere yarn differs from Example 3 in that, in S2, the conditioning agent is sprayed onto the fibers obtained after blending cotton in a segmented spraying manner. In the first spraying process, only 60wt% of antistatic agent is sprayed, and after standing for 12 hours, the remaining antistatic agent is sprayed. The rest is the same as in Example 3.

[0034] Example 8 A method for preparing anti-pilling cashmere yarn, differing from Example 3, is that the Raccoon raw cashmere in S1 undergoes a protein padding treatment before being blended with Cashmere, Viscose, and Nylon. Specifically: Raccoon fibers were impregnated with a collagen aqueous solution at a concentration of 20 g / L to achieve a 100% liquid-carrying rate. The Raccoon fibers were then dried to obtain pretreated Raccoon fibers. The collagen in the collagen aqueous solution had a molecular weight of 1700.

[0035] Example 9 A method for preparing anti-pilling cashmere yarn, differing from Example 3, is that the Raccoon raw cashmere in S1 undergoes a protein padding treatment before being blended with Cashmere, Viscose, and Nylon. Specifically: Raccoon fibers were impregnated with a collagen aqueous solution at a concentration of 10 g / L to achieve a 100% liquid-carrying rate. The Raccoon fibers were then dried to obtain pretreated Raccoon fibers. The collagen in the collagen aqueous solution had a molecular weight of 1700.

[0036] Example 10 A method for preparing anti-pilling cashmere yarn, differing from Example 3, is that the Raccoon raw cashmere in S1 undergoes a protein padding treatment before being blended with Cashmere, Viscose, and Nylon. Specifically: Raccoon fibers were impregnated with a collagen aqueous solution at a concentration of 30 g / L to achieve a 100% liquid-carrying rate. The Raccoon fibers were then dried to obtain pretreated Raccoon fibers. The collagen in the collagen aqueous solution had a molecular weight of 1700.

[0037] Example 11 A method for preparing anti-pilling cashmere yarn, differing from Example 3, is that the Raccoon raw cashmere in S1 undergoes a protein padding treatment before being blended with Cashmere, Viscose, and Nylon. Specifically: Raccoon fibers were impregnated with a collagen aqueous solution with a concentration of 20 g / L to achieve a liquid-carrying rate of 100%. The Raccoon fibers were then dried to obtain pretreated Raccoon fibers. The collagen in the collagen aqueous solution had a molecular weight of 1300.

[0038] Example 12 A method for preparing anti-pilling cashmere yarn, differing from Example 3, is that the Raccoon raw cashmere in S1 undergoes a protein padding treatment before being blended with Cashmere, Viscose, and Nylon. Specifically: Raccoon fibers were impregnated with a collagen aqueous solution at a concentration of 20 g / L to achieve a 100% liquid-carrying rate. The Raccoon fibers were then dried to obtain pretreated Raccoon fibers. The collagen in the collagen aqueous solution had a molecular weight of 10,000.

[0039] Comparative Example 1 The difference from Example 1 is that in S1, the weight ratio of Raccoon raw fleece, Cashmere white fleece, viscose and nylon is 25:25:25:25, while the rest is the same as in Example 1.

[0040] Comparative Example 2 The difference from Example 1 is that in S1, the weight ratio of Raccoon raw fleece, Cashmere white fleece, viscose and nylon is 40:40:10:10, while the rest is the same as in Example 1.

[0041] Performance testing Anti-pilling test: The test was conducted in accordance with GB / T 4802.3-2008 "Textiles - Determination of Pilling Properties - Part 3: Pilling Box Method", with a test parameter of 7200 revolutions. Air permeability test: The test was conducted according to GB / T 5453-1997 "Textiles - Determination of Air Permeability of Fabrics", with a test area of ​​20 cm². 2 The pressure drop is selected as 100 Pa; Dimensional stability test: Dimensional change is determined according to GB / T 8628-2001 "Determination of Dimensional Change of Textiles after Washing". The warp and weft lengths of the samples are measured before and after washing, and the dimensional change rate is calculated.

[0042] Table 1 Data Record Table

[0043] Data Analysis: As shown in Table 1, the anti-pilling cashmere yarns obtained in Examples 1-2 of this application have an anti-pilling rating of level 3 or higher, an air permeability of 1350-1360 mm / s, and a dimensional change rate of <1.0%. However, the cashmere yarn in Comparative Example 1 only has an air permeability of 840 mm / s, resulting in a poor wearing experience. The cashmere yarn in Comparative Example 2 only has an anti-pilling rating of level 2 and a dimensional change rate of <1.4%. It is evident that this application utilizes a certain proportion of Raccoon raw cashmere, Cashmere white cashmere, Viscose, and nylon as raw materials. Among these, Raccoon raw cashmere has a good hand feel, is fluffy, and smooth, providing excellent skin-friendliness for the anti-pilling cashmere yarn. Ere white cashmere has a low short fiber content, with an average fiber length of over 35mm, which effectively reduces short fiber shedding. Viscose is a viscose fiber with the feel of cashmere and high moisture absorption, increasing the overall moisture regain of the yarn and reducing static electricity, thus helping to prevent pilling. Nylon increases the overall strength of the anti-pilling cashmere yarn, preventing post-processing from affecting the weaving strength. By blending, opening, picking, loosening and removing impurities, carding, drawing, drafting, twisting, winding, napping and shaping the above-mentioned Raccoon raw cashmere, Cashmere white cashmere, viscose and nylon, an anti-pilling cashmere yarn with good anti-pilling effect, skin-friendly and dimensional stability can be obtained.

[0044] In Examples 3-5, this application replaced the cationic internal antistatic agent with an ionic liquid antistatic agent. The results showed that the air permeability and dimensional change rate of the anti-pilling cashmere yarn remained almost unchanged, but the anti-pilling grade reached 4-5. It can be seen that the ionic liquid antistatic agent has a certain water absorption capacity and can absorb moisture after migrating to the substrate surface, forming a thin layer of water on the substrate surface for conductivity. The anions and cations form a uniform charge balance layer on the fiber surface, effectively neutralizing the static charge on the fiber surface, reducing the static adsorption between fibers, and significantly reducing the surface resistance of the cashmere yarn, while hardly affecting its mechanical properties.

[0045] In Examples 6-7, this application uses a segmented spraying method to spray the conditioning agent onto the fibers obtained after blending cotton. The results show that the anti-pilling level reached level 5. It can be seen that the segmented spraying process used in this application, which first pre-treats with a low concentration of antistatic agent and then performs a secondary treatment with a high concentration of antistatic agent, can indeed further optimize the electrostatic shielding effect.

[0046] In Examples 8-12, the Raccoon raw cashmere in S1 of this application underwent protein padding treatment before being blended with Cashmere, Viscose, and Nylon. The results showed that Example 8 achieved an anti-pilling grade of 5, and the anti-pilling cashmere yarn of Example 8 exhibited high air permeability and dimensional stability, demonstrating a more balanced and superior overall performance compared to Examples 9-12. This demonstrates that this application utilizes a collagen aqueous solution to pad the Raccoon raw cashmere. Collagen has adhesive properties, enabling adhesion to the scale layer on the surface of the Raccoon raw cashmere. When the fiber is rubbed, the phenomenon of scales hooking together is greatly reduced, the directional friction effect almost disappears, and the number of surface fibers is significantly reduced. Therefore, the anti-pilling effect of the final anti-pilling cashmere yarn is significantly improved. This application also controls the concentration of the collagen aqueous solution and the molecular weight of the collagen to balance the anti-pilling ability, air permeability, and dimensional stability of the anti-pilling cashmere yarn as much as possible.

[0047] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A method for preparing anti-pilling cashmere yarn, characterized in that, Includes the following steps: S1. Blending: Raccoon raw fleece, Cashmere white fleece, viscose and nylon are blended in a weight ratio of (30-35):(30-35):(15-20):(15-20); S2. Opening the cotton; S3. Grab the cotton; S4. Loosen and remove impurities; S5. Carding; S6. Sliver Combining: The output speed is 300m / min, with 8 slivers combined in the first pass and 8 slivers combined in the last pass. The output weight of the first pass is 21±0.3g / 5m, and the output weight of the last pass is 22±0.2g / 5m. The traction ratio of the first pass is 1.7-1.8, and the traction ratio of the last pass is 1.3-1.

4. S7. Drafting: The drafting speed is 24-28 m / min, the total draft ratio is 6.3-6.5, and the back zone draft ratio is 1.2-1.3; S8. Twisting: Hollow twist is 570-800T / M, ring twist is 200-236T / M, draw ratio is 9-12.6, and untwisting coefficient is 0.49-0.70; S9. Winding tube; S10. Roughening; S11. Molding.

2. The method for preparing anti-pilling cashmere yarn according to claim 1, characterized in that, In S1, the weight ratio of Raccoon raw fleece, Cashmere white fleece, Viscose, and nylon is 30:30:20:

20.

3. The method for preparing anti-pilling cashmere yarn according to claim 1, characterized in that, In S2, the specific operation is as follows: Spray the blended fibers with a moisture regain of 13-15%, let stand for 48 hours, and then open the fibers. The conditioning agent includes wool oil, antistatic agent, and water in a weight ratio of 1:(1.2-1.8):

15.

4. The method for preparing anti-pilling cashmere yarn according to claim 3, characterized in that, The antistatic agent is an ionic liquid antistatic agent, and the anion in the ionic liquid antistatic agent includes any one of tetrafluoroborate ion, hexafluorophosphate ion, and bis(trifluoromethanesulfonyl)imide ion.

5. The method for preparing anti-pilling cashmere yarn according to claim 4, characterized in that, The anion in the ionic liquid antistatic agent is a bis(trifluoromethanesulfonyl)imide ion.

6. The method for preparing anti-pilling cashmere yarn according to claim 3, characterized in that, In step S2, the conditioning agent is sprayed onto the fibers obtained after blending using a segmented spraying method, specifically as follows: Apply the conditioning agent to the fibers obtained after blending cotton with a moisture regain of 13-15%. During the first spraying, only 60-70 wt% of the antistatic agent is sprayed. After standing for 12 hours, the remaining antistatic agent is sprayed.

7. The method for preparing anti-pilling cashmere yarn according to claim 1, characterized in that, Before being blended with Cashmere, Viscose, and Nylon, the Raccoon raw cotton in S1 undergoes a protein padding treatment, specifically: Raccoon raw fibers are impregnated with a collagen aqueous solution with a concentration of 10-30 g / L to achieve a liquid-carrying rate of 100%. The Raccoon raw fibers are then dried to obtain pretreated Raccoon raw fibers. The collagen in the collagen aqueous solution has a molecular weight of 1300, 1700 or 10000.

8. The method for preparing anti-pilling cashmere yarn according to claim 7, characterized in that, The concentration of the collagen aqueous solution is 20 g / L.

9. The method for preparing anti-pilling cashmere yarn according to claim 7, characterized in that, The collagen has a molecular weight of 1700.

10. Anti-pilling cashmere yarn prepared by the method of any one of claims 1-9.

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