A low-pilary anti-pilling cashmere yarn and a preparation method thereof
Patent Information
- Application Number
- CN202611294060.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-08-25
- Publication Date
- 2026-10-23
AI Technical Summary
但是，羊绒纱线为获得较好耐洗稳定性，通常还需要较高整理增重，这明显影响了羊绒纱线的轻柔特性
[0038]本申请通过半干态残余液桥在羊绒纱线毛羽根部、纱线捻回沟槽及局部纤维交叉区域的选择性保留作用，使A组分与B组分的二次反应及后续紫外光交联锁定限域发生于起球关键部位，形成非连续点状、颈缩状、环状或半环状微锚固结构，从而有效限制毛羽根部迁移、外伸摆动和毛羽间缠结，降低羊绒纱线在摩擦服用过程中的毛球形成概率；与传统树脂或聚合物整体成膜整理相比，本申请不在羊绒纤维主体表面形成连续包覆膜，能够在0.5～3.0wt%的低整理增重条件下提高羊绒纱线及其针织制品的抗起球性能和耐洗稳定性，同时减少手感变硬、蓬松性下降和透气性降低等问题，较好保持羊绒纱线原有的柔软手感、蓬松性和穿着舒适性。
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Abstract
Description
Technical Field
[0001] This application relates to the field of textile functional finishing agents, and more specifically, it relates to a low-hair, anti-pilling cashmere yarn and its preparation method. Background Technology
[0002] Cashmere fiber is prized for its fineness, soft feel, and excellent warmth, making it a crucial raw material for high-end knitwear. However, the dense scales and wide fiber length distribution of cashmere fibers make them prone to developing fuzz during spinning, winding, weaving, and wear. This fuzz migrates, tangles, and gradually forms fuzz balls during repeated friction and washing, leading to a decline in fabric appearance and lifespan.
[0003] Conventional anti-pilling finishing techniques for cashmere yarns or fabrics typically employ polyurethane finishing, acrylate finishing, silicone softener compound finishing, or enzymatic weight reduction finishing. While these methods can reduce the outward spread of cashmere fibers or improve the bonding strength between fibers to some extent, thus mitigating pilling during repeated friction and washing, achieving good wash resistance usually requires significant weight gain from these finishing processes, which noticeably affects the softness and lightness of the cashmere yarn. Summary of the Invention
[0004] To improve the washability and softness of cashmere yarn, this application provides a low-hair, anti-pilling cashmere yarn and its preparation method.
[0005] In the first aspect, this application provides a low-hair, anti-pilling cashmere yarn, employing the following technical solution:
[0006] A method for preparing low-hair, anti-pilling cashmere yarn includes the following steps:
[0007] S1: The cashmere yarn is washed, rinsed and dried to obtain pretreated cashmere yarn;
[0008] S2: The pretreated cashmere yarn is immersed in the finishing aqueous solution of component A, and then squeezed to obtain cashmere yarn impregnated with component A.
[0009] The aqueous solution of component A includes natural polymer materials, polyethylene glycol diacrylate, and a water-soluble photoinitiator;
[0010] The natural polymer material includes any one of methacrylamide carboxymethyl chitosan, methacrylamide chitosan, methacrylamide gelatin, and methacrylamide silk fibroin;
[0011] S3: The cashmere yarn impregnated with component A is pre-dried at low temperature to obtain cashmere yarn with a liquid content of 8-18 wt%.
[0012] S4: Under a yarn tension of 0.08 to 0.30 cN / dtex, and with the help of oblique airflow, the surface hairs of cashmere yarn with a liquid content of 8 to 18 wt% are tilted at 20 to 60° relative to the axial direction of the cashmere yarn, resulting in a cashmere yarn that has undergone stretching, necking and local enrichment treatment.
[0013] S5. Apply component B triggering aqueous solution to the surface of the stretched, necked and locally enriched cashmere yarn using ultrasonic atomization, then irradiate the cashmere yarn with 365nm ultraviolet light, rinse and dry to obtain low-hair and anti-pilling cashmere yarn.
[0014] The triggering aqueous solution of component B includes one or more of sodium tripolyphosphate, phytate, and zinc salt.
[0015] The cashmere yarn is pure cashmere yarn, or cashmere blended yarn with a cashmere content of not less than 70wt%.
[0016] By employing the above technical solution, firstly, by utilizing the differences in liquid residue capacity at different locations during the low-temperature pre-drying process of cashmere yarn, the finishing solution of component A, containing methacrylamide carboxymethyl chitosan, does not form a continuous liquid film on the surface of the yarn body. Instead, a small amount of semi-dry residual liquid bridges are retained at the root of the fibers, in the yarn twist grooves, and in local fiber crossing areas. These residual liquid bridges have local enrichment and spatial confinement effects, and can serve as microreactors for the subsequent entry and reaction of component B.
[0017] Secondly, under the influence of yarn tension and oblique airflow, the surface hairs of the cashmere yarn are tilted or semi-erect, and the semi-dry residual liquid bridges at the roots of the hairs undergo stretching, necking, and local concentration. Subsequently, a triggering liquid containing sodium tripolyphosphate, phytate, and / or zinc salt is introduced via ultrasonic atomization. Since there is no continuous liquid film on the main surface of the yarn, component B is preferentially captured by the residual liquid bridges at the roots of the hairs and the twist grooves of the yarn, and undergoes ion gelation and / or coordination crosslinking reactions with component A in this local micro-region.
[0018] Finally, after irradiation with 365nm ultraviolet light, the photocrosslinkable groups in component A undergo curing and shrinkage, causing the liquid bridge micro-regions after the A / B reaction to form discontinuous dot-like, necked, ring-like, or semi-ring-like micro-anchoring structures at the root of the hair and the twisting grooves of the yarn. This micro-anchoring structure can restrict the migration, outward swinging, and entanglement of the hair roots, thereby reducing the probability of pilling during friction. At the same time, since the finishing reaction is mainly confined to the semi-dry residual liquid bridge region, it avoids the formation of a continuous coating film on the surface of the cashmere fiber body by traditional resin finishing, achieving a synergistic improvement in low weight gain, low hairiness, and anti-pilling performance.
[0019] Preferably, in the aqueous solution of component A, the mass concentration of methacryloyl carboxymethyl chitosan is 0.5-2.0 wt%, the mass concentration of polyethylene glycol diacrylate is 0.05-0.5 wt%, and the mass concentration of water-soluble photoinitiator is 0.05-0.3 wt%.
[0020] By employing the above technical solution, the aqueous solution of component A, composed of the three raw materials at the above mass concentration, provides photocrosslinkable alkenyl groups and ionically complexed carboxyl groups. Component B contains sodium tripolyphosphate, phytate, or zinc salt, which can provide polyvalent cations.
[0021] When component B is selectively captured by the semi-dry liquid bridge, the carboxyl groups of component A and the cations of component B undergo ionic gelation, and the alkenyl groups are copolymerized under ultraviolet light driven by a photoinitiator. Then, a cross-linked network forms at the hair root and twist grooves, effectively limiting hair root migration and outward waving, thereby reducing the probability of friction pilling. Simultaneously, weight gain is extremely low, ultimately achieving a balance between low hairiness, anti-pilling, and a comfortable feel.
[0022] Preferably, in step S3, the low-temperature pre-drying temperature is 40-60°C and the pre-drying time is 3-10 min.
[0023] By adopting the above technical solution, the above drying temperature and drying time can gently remove excess moisture from the surface of the yarn body and avoid high temperature damage to cashmere protein fibers.
[0024] Simultaneously, this condition causes the liquid film on the surface of the main fiber to rupture and evaporate first, while the twisted grooves and the root of the fibers retain semi-dry liquid bridges due to capillary effect. The liquid bridges are moderately concentrated during this process, increasing the enrichment of component A, which provides an ideal microenvironment for the subsequent preferential capture and local cross-linking of component B, while ensuring that the main body has no continuous coating film, resulting in a soft feel and extremely low weight gain.
[0025] Preferably, in step S5, the mass concentration of the triggering aqueous solution of component B is 0.1 to 1.0 wt%, the droplet size formed by ultrasonic atomization is 5 to 30 μm, and the amount of the triggering aqueous solution of component B applied is 1 to 6 wt% of the cashmere yarn mass.
[0026] By employing the above technical solution, the concentration of component B is low and the application amount is moderate. This not only replenishes the reaction requirements within the liquid bridge without wetting the substrate, but also effectively prevents film formation on the substrate surface. Furthermore, the droplets formed by ultrasonic atomization are fine, allowing component B to precisely penetrate to the root of the hairs and the twisted grooves, where it is captured by the semi-dry liquid bridge. Therefore, under these conditions, the reaction of component B is confined to the liquid bridge, forming localized anchoring. The substrate experiences minimal weight gain without encapsulation, resulting in a soft feel. Simultaneously, the hairs are effectively anchored, improving anti-pilling performance.
[0027] Preferably, the triggering aqueous solution of component B is a mixed aqueous solution of sodium tripolyphosphate and sodium phytate.
[0028] By employing the above technical solution, both sodium tripolyphosphate and sodium phytate can provide multivalent anions, which then undergo electrostatic cross-linking with the carboxyl groups of component A to form an ionic network. Through the synergistic effect of anions of different sizes and charge densities, a denser, complementary cross-linked structure can be constructed, enhancing the anchoring strength. Therefore, the resulting yarn has a soft hand feel, extremely low weight gain, and firmly anchored fuzz, significantly improving its anti-pilling durability.
[0029] Preferably, the triggering aqueous solution of component B is a mixed aqueous solution of sodium phytate and zinc acetate.
[0030] By employing the above technical solution, dual cross-linking sites of phytate polyvalent anions and zinc ions can be provided. Zinc ions can coordinate with the carboxyl groups of component A for cross-linking, while phytate ions enhance the anchoring network through hydrogen bonds or ionic complexation. Therefore, the two work synergistically to form a denser ionic cross-linking structure, improving the mechanical strength of the anchoring points and effectively enhancing the yarn's anti-pilling durability.
[0031] Preferably, in step S5, the irradiation method of 365nm ultraviolet light is oblique incidence irradiation, ring irradiation or pulse irradiation, and the irradiation time is 30 to 120 seconds.
[0032] By employing the above technical solution, the absorption peak of the photoinitiator is precisely matched with a 365nm wavelength, driving the cross-linking and curing of alkenes within the liquid bridge. Irradiation for 30–120 seconds ensures sufficient cross-linking, and the shrinkage during photocuring causes the anchoring points to tightly hold the roots of the fibers. Therefore, the main fiber retains its original soft hand feel, and the weight gain after finishing is almost negligible. The dotted anchoring points formed at the roots of the fibers are strong and durable, and can inhibit fiber migration and entanglement for a long time, thus giving the yarn excellent anti-pilling properties.
[0033] Meanwhile, oblique incidence irradiation can strengthen root anchoring along the tilt direction of the hair; ring irradiation eliminates dead angles in the circumferential irradiation of the yarn; pulse irradiation promotes stepwise curing and shrinkage, reducing heat accumulation.
[0034] Secondly, this application provides a low-hair, anti-pilling cashmere yarn, employing the following technical solution:
[0035] A low-hair, anti-pilling cashmere yarn is prepared by the above-mentioned method for preparing low-hair, anti-pilling cashmere yarn.
[0036] By employing the above-described technical solution, the cashmere yarn produced according to the method of this application exhibits a discontinuous micro-anchoring structure on its surface only at the root of the hairs and at the twist grooves, while the surface of the main fiber body lacks a continuous coating. This structure precisely limits the finishing reaction at key pilling locations, while the main fibers remain in a free state, resulting in a yarn that is fluffy and soft to the touch with minimal weight gain. Simultaneously, the anchoring points effectively restrict hair migration and entanglement, significantly improving the yarn's anti-pilling performance, thus providing both a comfortable wearing experience and lasting durability.
[0037] In summary, this application has the following beneficial effects:
[0038] This application utilizes the selective retention effect of semi-dry residual liquid bridges at the root of cashmere yarn fibers, yarn twist grooves, and local fiber cross-linking areas. This allows the secondary reaction of component A and component B, as well as subsequent UV cross-linking locking and confinement, to occur at key pilling sites, forming discontinuous dot-like, necked, ring-like, or semi-ring-like micro-anchoring structures. This effectively restricts the migration, outward swinging, and entanglement of fibers at the root, reducing the probability of pilling during the friction and wearing process of cashmere yarn. Compared with traditional resin or polymer integral film-forming finishing, this application does not form a continuous coating film on the surface of the cashmere fiber body. It can improve the anti-pilling performance and wash resistance stability of cashmere yarn and its knitted products under low finishing weight gain conditions of 0.5-3.0 wt%, while reducing problems such as hardening of the hand feel, decrease in fluffiness, and reduction in breathability, thus better maintaining the original soft hand feel, fluffiness, and wearing comfort of cashmere yarn. Attached Figure Description
[0039] Figure 1 This is a schematic diagram of the selective capture of component B in an aqueous solution triggered by a semi-dry residual liquid bridge in cashmere yarn in Example 1;
[0040] Figure 2 In Figures a and b, the film-forming structures of Comparative Example 2 and Example 1 are schematic diagrams, respectively. Detailed Implementation
[0041] The present application will be further described in detail below with reference to the embodiments and accompanying drawings.
[0042] Unless otherwise specified below, all raw materials used in the embodiments of this application are commercially available.
[0043] The water-soluble photoinitiator used is lithium phenyl-2,4,6-trimethylbenzoylphosphonate (LAP).
[0044] Example
[0045] Example 1
[0046] A method for preparing low-hair, anti-pilling cashmere yarn includes the following steps:
[0047] S1: 26 Nm / 2 Pure cashmere yarn was washed for 15 minutes at 35 ℃ in a 1.0 g / L nonionic surfactant aqueous solution, rinsed twice, and then dried at 40 ℃ to obtain pretreated cashmere yarn.
[0048] In this application, the nonionic surfactant is a fatty alcohol polyoxyethylene ether (AEO) or an isomeric alcohol polyoxyethylene ether, with commercial brands including AEO-9, AEO-7, JFC, or BASF's Lutensol® AO / TO series. In this embodiment, it is specifically AEO-9.
[0049] S2: The pretreated cashmere yarn was immersed in the finishing aqueous solution of component A for 60 s, and then squeezed to obtain cashmere yarn impregnated with component A, wherein the initial liquid content of the cashmere yarn impregnated with component A was 55 wt%;
[0050] Component A is a prepared aqueous solution composed of 1.2 wt% methacrylamide carboxymethyl chitosan, 0.20 wt% polyethylene glycol diacrylate, 0.12 wt% LAP and the balance deionized water, with the pH adjusted to 6.2.
[0051] S3: The cashmere yarn impregnated with component A is pre-dried at 50 ℃ for 6 min to obtain cashmere yarn with a liquid content of 12wt%.
[0052] S4: Cashmere yarn with stretching, necking and local enrichment treatment is obtained by treating the yarn with an oblique airflow at 35° relative to the yarn axis and an airflow velocity of 8 m / s under a yarn tension of 0.16 cN / dtex and a 35° relative to the yarn axis.
[0053] S5: The triggering aqueous solution of component B is atomized into droplets with an average particle size of about 12 μm by ultrasonic atomization and applied to the surface of the cashmere yarn after stretching, necking and local enrichment treatment. The amount of triggering aqueous solution of component B applied is 3.0 wt% of the mass of cashmere yarn. After application, it is left to stand for 30 s, and then the cashmere yarn is irradiated with a 365nm ring ultraviolet light source at 12 mW / cm² for 75 s. It is then gently rinsed with deionized water and dried at 40℃ to constant weight to obtain low-hair and anti-pilling cashmere yarn.
[0054] The triggering aqueous solution of component B consists of a mixture of 0.25 wt% sodium tripolyphosphate, 0.15 wt% sodium phytate, and the balance deionized water.
[0055] Example 2
[0056] A method for preparing low-hair, anti-pilling cashmere yarn includes the following steps:
[0057] S1: 36 Nm / 2 Pure cashmere yarn was washed for 15 minutes at 35 ℃ in a 1.0 g / L nonionic surfactant aqueous solution, rinsed twice, and then dried at 40 ℃ to obtain pretreated cashmere yarn.
[0058] S2: The pretreated cashmere yarn was immersed in the finishing aqueous solution of component A for 60 s, and then squeezed to obtain cashmere yarn impregnated with component A, wherein the initial liquid content of the cashmere yarn impregnated with component A was 55 wt%;
[0059] Component A is a prepared aqueous solution composed of 0.8 wt% methacrylamide carboxymethyl chitosan, 0.15 wt% polyethylene glycol diacrylate, 0.10 wt% LAP and the balance deionized water, with the pH adjusted to 6.2.
[0060] S3: The cashmere yarn impregnated with component A is pre-dried at a low temperature of 48°C for 8 minutes to obtain cashmere yarn with a liquid content of 10wt%.
[0061] S4: Cashmere yarn with stretching, necking and local enrichment treatment is obtained by treating the yarn with an oblique airflow at 30° relative to the yarn axis and an airflow velocity of 8 m / s under a yarn tension of 0.12 cN / dtex and a 30° relative to the yarn axis.
[0062] S5: The B-component triggering aqueous solution is atomized into droplets with an average particle size of about 8 μm using ultrasonic atomization and applied to the surface of the cashmere yarn after stretching, necking and local enrichment treatment. The amount of B-component triggering aqueous solution applied is 2.5 wt% of the cashmere yarn mass. After application, the yarn is left to stand for 30 s, then irradiated with 365nm pulsed ultraviolet light for 60 s, gently rinsed with deionized water, and dried at 40℃ to constant weight to obtain low-hair and anti-pilling cashmere yarn.
[0063] The triggering aqueous solution of component B consists of a mixture of 0.25 wt% sodium phytate, 0.15 wt% zinc acetate, and the balance deionized water.
[0064] Example 3
[0065] A method for preparing low-hair, anti-pilling cashmere yarn includes the following steps:
[0066] S1: 28 Nm / of cashmere / wool in a mass ratio of 80 / 20. 2 The blended yarn was washed for 15 min at 35 ℃ in an aqueous solution of 1.0 g / L nonionic surfactant, rinsed twice, and then dried at 40 ℃ to obtain the pretreated cashmere yarn.
[0067] S2: The pretreated cashmere yarn was immersed in the finishing aqueous solution of component A for 60 s, and then squeezed to obtain cashmere yarn impregnated with component A, wherein the initial liquid content of the cashmere yarn impregnated with component A was 55 wt%;
[0068] Component A is a prepared aqueous solution composed of 1.5 wt% methacrylamide gelatin, 0.3 wt% polyethylene glycol diacrylate, 0.15 wt% LAP and the balance deionized water, with the pH adjusted to 6.2.
[0069] S3: The cashmere yarn impregnated with component A is pre-dried at a low temperature of 55°C for 5 minutes to obtain cashmere yarn with a liquid content of 15wt%.
[0070] S4: Cashmere yarn with stretching, necking and local enrichment treatment is obtained by treating the yarn with an oblique airflow at 45° relative to the yarn axis and an airflow velocity of 8 m / s under a yarn tension of 0.22 cN / dtex and a 45° relative to the yarn axis.
[0071] S5: The B-component triggering aqueous solution is atomized into droplets with an average particle size of about 18 μm using ultrasonic atomization and applied to the surface of the cashmere yarn after stretching, necking and local enrichment treatment. The amount of B-component triggering aqueous solution applied is 4.5 wt% of the cashmere yarn mass. After application, the yarn is left to stand for 30 s, then irradiated with 365 nm oblique incident ultraviolet light for 90 s, gently rinsed with deionized water, and dried at 40℃ to constant weight to obtain low-hair and anti-pilling cashmere yarn.
[0072] The triggering aqueous solution of component B consists of 0.35 wt% sodium tripolyphosphate, 0.15 wt% zinc acetate, and the balance deionized water.
[0073] Example 4
[0074] A method for preparing low-hair, anti-pilling cashmere yarn includes the following steps:
[0075] S1: 48 Nm / 2 Pure cashmere yarn was washed for 15 minutes at 35 ℃ in a 1.0 g / L nonionic surfactant aqueous solution, rinsed twice, and then dried at 40 ℃ to obtain pretreated cashmere yarn.
[0076] S2: The pretreated cashmere yarn was immersed in the finishing aqueous solution of component A for 60 s, and then squeezed to obtain cashmere yarn impregnated with component A, wherein the initial liquid content of the cashmere yarn impregnated with component A was 55 wt%;
[0077] Component A is a mixture of 0.6 wt% methacrylamide carboxymethyl chitosan, 0.08 wt% polyethylene glycol diacrylate, 0.06 wt% LAP, and the balance being deionized water, with the pH adjusted to 6.2.
[0078] S3: The cashmere yarn impregnated with component A is pre-dried at 60°C for 4 minutes to obtain cashmere yarn with a liquid content of 9wt%.
[0079] S4: Cashmere yarn with stretching, necking and local enrichment treatment is obtained by treating the yarn with an oblique airflow at 25° relative to the yarn axis and an airflow velocity of 8 m / s under a yarn tension of 0.10 cN / dtex and a 25° relative to the yarn axis.
[0080] S5: The B-component triggering aqueous solution is atomized into droplets with an average particle size of about 6 μm using ultrasonic atomization and applied to the surface of the cashmere yarn after stretching, necking and local enrichment treatment. The amount of B-component triggering aqueous solution applied is 1.5 wt% of the cashmere yarn mass. After application, the yarn is left to stand for 30 s, then irradiated with 365 nm ring ultraviolet light for 45 s, gently rinsed with deionized water, and dried at 40℃ to constant weight to obtain low-hair and anti-pilling cashmere yarn.
[0081] The triggering aqueous solution of component B consists of 0.12 wt% sodium phytate, 0.08 wt% zinc acetate, and the balance deionized water.
[0082] Comparative Example
[0083] Comparative Example 1
[0084] A method for preparing cashmere yarn includes the following steps:
[0085] 26 Nm / 2 Pure cashmere yarn was washed for 15 minutes at 35 ℃ in an aqueous solution of 1.0 g / L nonionic surfactant, rinsed twice, and then dried at 40 ℃ to obtain cashmere yarn.
[0086] Comparative Example 2
[0087] A method for preparing cashmere yarn, which differs from Example 1 in that, after impregnating the aqueous solution of component A in step S2, no pre-drying is performed.
[0088] The above-mentioned method for preparing cashmere yarn includes the following steps:
[0089] S1: 26 Nm / 2 Pure cashmere yarn was washed for 15 minutes at 35 ℃ in a 1.0 g / L nonionic surfactant aqueous solution, rinsed twice, and then dried at 40 ℃ to obtain pretreated cashmere yarn.
[0090] S2: The pretreated cashmere yarn was immersed in the finishing aqueous solution of component A for 60 s, and then squeezed to obtain cashmere yarn impregnated with component A, wherein the initial liquid content of the cashmere yarn impregnated with component A was 55 wt%;
[0091] Component A is a prepared aqueous solution composed of 1.2 wt% methacrylamide carboxymethyl chitosan, 0.20 wt% polyethylene glycol diacrylate, 0.12 wt% LAP and the balance deionized water, with the pH adjusted to 6.2.
[0092] S3: Under a yarn tension of 0.16 cN / dtex, the yarn is treated with an oblique airflow at 35° relative to the yarn axis of the impregnated component A, and the airflow velocity is 8 m / s, so that the surface hair angle is mainly distributed in the range of 35 to 45°, resulting in a cashmere yarn that has undergone stretching, necking and local enrichment treatment.
[0093] S4: The B-component triggering aqueous solution was atomized into droplets with an average particle size of about 12 μm using ultrasonic atomization and applied to the surface of the cashmere yarn after stretching, necking and local enrichment treatment. The amount of B-component triggering aqueous solution applied was 3.0 wt% of the cashmere yarn mass. After application, the yarn was allowed to stand for 30 s, and then irradiated with a 365nm ring ultraviolet light source at 12 mW / cm² for 75 s. The yarn was then gently rinsed with deionized water and dried at 40℃ to constant weight to obtain low-hair and anti-pilling cashmere yarn.
[0094] The triggering aqueous solution of component B consists of a mixture of 0.25 wt% sodium tripolyphosphate, 0.15 wt% sodium phytate, and the balance deionized water.
[0095] Comparative Example 3
[0096] A method for preparing cashmere yarn, which differs from Example 1 in that step S5 does not involve applying component B to trigger the aqueous solution.
[0097] The above-mentioned method for preparing cashmere yarn includes the following steps:
[0098] S1: 26 Nm / 2 Pure cashmere yarn was washed for 15 minutes at 35 ℃ in a 1.0 g / L nonionic surfactant aqueous solution, rinsed twice, and then dried at 40 ℃ to obtain pretreated cashmere yarn.
[0099] S2: The pretreated cashmere yarn was immersed in the finishing aqueous solution of component A for 60 s, and then squeezed to obtain cashmere yarn impregnated with component A, wherein the initial liquid content of the cashmere yarn impregnated with component A was 55 wt%;
[0100] Component A is a prepared aqueous solution composed of 1.2 wt% methacrylamide carboxymethyl chitosan, 0.20 wt% polyethylene glycol diacrylate, 0.12 wt% LAP and the balance deionized water, with the pH adjusted to 6.2.
[0101] S3: The cashmere yarn impregnated with component A is pre-dried at 50 ℃ for 6 min to obtain cashmere yarn with a liquid content of 12wt%.
[0102] S4: Cashmere yarn with stretching, necking and local enrichment treatment is obtained by treating the yarn with an oblique airflow at 35° relative to the yarn axis and an airflow velocity of 8 m / s under a yarn tension of 0.16 cN / dtex and a 35° relative to the yarn axis.
[0103] S5: The cashmere yarn is irradiated with a 365nm ring ultraviolet light source at 12 mW / cm² for 75s, gently rinsed with deionized water, and dried at 40℃ to constant weight to obtain low-hair and anti-pilling cashmere yarn.
[0104] Comparative Example 4
[0105] A method for preparing cashmere yarn, which differs from Example 1 in that, in step S3, the liquid content of the pre-dried cashmere yarn is 3wt%.
[0106] The above-mentioned method for preparing cashmere yarn includes the following steps:
[0107] S1: 26 Nm / 2 Pure cashmere yarn was washed for 15 minutes at 35 ℃ in a 1.0 g / L nonionic surfactant aqueous solution, rinsed twice, and then dried at 40 ℃ to obtain pretreated cashmere yarn.
[0108] S2: The pretreated cashmere yarn was immersed in the finishing aqueous solution of component A for 60 s, and then squeezed to obtain cashmere yarn impregnated with component A, wherein the initial liquid content of the cashmere yarn impregnated with component A was 55 wt%;
[0109] Component A is a prepared aqueous solution composed of 1.2 wt% methacrylamide carboxymethyl chitosan, 0.20 wt% polyethylene glycol diacrylate, 0.12 wt% LAP and the balance deionized water, with the pH adjusted to 6.2.
[0110] S3: The cashmere yarn impregnated with component A is pre-dried at 50 ℃ for 6 min to obtain cashmere yarn with a liquid content of 3wt%.
[0111] S4: Cashmere yarn with stretching, necking and local enrichment treatment is obtained by treating the yarn with an oblique airflow at 35° relative to the yarn axis and an airflow velocity of 8 m / s under a yarn tension of 0.16 cN / dtex and a 35° relative to the yarn axis.
[0112] S5: The triggering aqueous solution of component B is atomized into droplets with an average particle size of about 12 μm by ultrasonic atomization and applied to the surface of the cashmere yarn after stretching, necking and local enrichment treatment. The amount of triggering aqueous solution of component B applied is 3.0 wt% of the mass of cashmere yarn. After application, it is left to stand for 30 s, and then the cashmere yarn is irradiated with a 365nm ring ultraviolet light source at 12 mW / cm² for 75 s. It is then gently rinsed with deionized water and dried at 40℃ to constant weight to obtain low-hair and anti-pilling cashmere yarn.
[0113] The triggering aqueous solution of component B consists of a mixture of 0.25 wt% sodium tripolyphosphate, 0.15 wt% sodium phytate, and the balance deionized water.
[0114] Performance testing
[0115] I. The cashmere yarns prepared in the embodiments and comparative examples of this application were tested for liquid content, finishing weight gain, number of hairs, anti-pilling properties, and softness. The testing methods are as follows:
[0116] Liquid content: The mass of the pre-dried cashmere yarn is recorded as m2, and the mass of the same sample after being completely dried to constant weight is recorded as m0. The liquid content is calculated as (m2-m0) / m0×100%.
[0117] Finishing weight gain rate: The constant weight before finishing is recorded as m0, and the constant weight after finishing is recorded as m1. The finishing weight gain rate is calculated as (m1-m0) / m0×100%.
[0118] Hairiness test: Using a yarn hairiness tester, count the number of hairs with a length of not less than 3mm under the same test speed and tension conditions, and convert them into the number of hairs per 10m of yarn; hairiness after friction is tested using the same method.
[0119] Pilling resistance test: Knitted samples of cashmere yarns with the same needle count and weave were prepared, and the pilling resistance grade was evaluated according to the pilling box method of GB / T4802.3 after conditioning. Washable samples were washed 10 times with a neutral detergent according to the gentle program for cashmere products, dried, and then tested again after conditioning.
[0120] Softness evaluation: The bending stiffness of knitted samples was measured under the same fabric structure, weight, and moisture conditioning conditions. The bending stiffness of the untreated sample was taken as 100%, and the relative bending stiffness of each sample was calculated. The closer the relative value is to 100%, the smaller the impact on the original soft hand feel.
[0121] II. Performance test results of the embodiments and comparative examples are shown in Table 1.
[0122] Table 1 Performance test results of the examples and comparative examples
[0123] Test item group Weight gain rate (%) Initial ≥3 mm feathers / (root·10 m⁻¹) After friction, ≥3 mm of hair / (root·10 m⁻¹) Initial anti-pilling rating Grade after 10 washes Relative bending stiffness / % Example 1 1.45 35 48 4-5 4 108 Example 2 1.08 39 52 4 4 106 Example 3 2.10 32 45 4-5 4 111 Example 4 0.72 44 58 4 3-4 104 Comparative Example 1 0 82 126 2-3 2 100 Comparative Example 2 4.62 30 40 4-5 4 137 Comparative Example 3 0.96 56 82 3-4 3 106 Comparative Example 4 0.42 68 103 3 2-3 102
[0124] As shown in Table 1, under the low finishing weight gain conditions of 0.72 to 2.10 wt%, Examples 1 to 4 showed significantly lower initial long hair count and hair growth after friction compared to untreated samples. Furthermore, the initial anti-pilling grade of the knitted samples reached level 4 or 4-5, and remained at level 3-4 or 4 after 10 washes.
[0125] Although Comparative Example 2 has better feather and anti-pilling properties, its finishing weight gain rate reached 4.62 wt%, and its relative bending stiffness increased significantly, indicating that continuous film formation has a significant impact on the soft feel of cashmere.
[0126] Comparative Example 3, lacking component B, exhibited a deficiency in the A / B secondary crosslinking network at the root of the hairs, resulting in lower anti-pilling and wash resistance compared to Example 1. Comparative Example 4, due to excessive pre-drying, had insufficient semi-dry residual liquid bridges, making it difficult for component B to selectively accumulate in key areas, significantly reducing the hair suppression effect. These results indicate that controlling the liquid content after pre-drying to 8–18 wt%, combined with oblique airflow, atomization, and UV locking, is crucial for forming a stable, discontinuous micro-anchoring structure that balances anti-pilling and softness.
[0127] At the same time, by Figure 1 It can be seen that the original scale outline can still be identified on the surface of the cashmere fiber body in Example 1, and no continuous film layer coverage appears; local dot-like, necked, and semi-circular connection structures can be observed at the root of the hair, twist groove, and fiber crossing position.
[0128] Figure 2 Figure a shows the traditional integral film-forming structure of Comparative Example 2, the main principle of which is to form a continuous coating film on the fiber surface. As can be seen from a, the yarn body surface of Comparative Example 2 has a large area of continuous or sheet-like covering layer, so the weight gain is higher, which easily causes the hand feel to become stiff and the fluffiness to decrease.
[0129] Figure 2 Figure b is a diagram of the confined micro-anchoring finishing structure used in Example 1. As shown in b, Example 1 forms discontinuous point-like, necked, or ring-like micro-anchoring structures at the root of the fibers, in the yarn twist grooves, and in local fiber crossing areas, achieving low weight gain and restricting migration at the root of the fibers. This further illustrates that this application achieves spatial confinement of the finishing reaction through semi-dry residual liquid bridges.
[0130] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.
Claims
1. A method for preparing low-hair, anti-pilling cashmere yarn, characterized in that, Includes the following steps: S1: The cashmere yarn is washed, rinsed and dried to obtain pretreated cashmere yarn; S2: The pretreated cashmere yarn is immersed in the finishing aqueous solution of component A, and then squeezed to obtain cashmere yarn impregnated with component A. The aqueous solution of component A includes natural polymer materials, polyethylene glycol diacrylate, and a water-soluble photoinitiator; The natural polymer material includes any one of methacrylamide carboxymethyl chitosan, methacrylamide chitosan, methacrylamide gelatin, and methacrylamide silk fibroin; S3: The cashmere yarn impregnated with component A is pre-dried at low temperature to obtain cashmere yarn with a liquid content of 8-18 wt%. S4: Under a yarn tension of 0.08 to 0.30 cN / dtex, and with the help of oblique airflow, the surface hairs of cashmere yarn with a liquid content of 8 to 18 wt% are tilted at 20 to 60° relative to the axial direction of the cashmere yarn, resulting in a cashmere yarn that has undergone stretching, necking and local enrichment treatment. S5. Apply component B triggering aqueous solution to the surface of the stretched, necked and locally enriched cashmere yarn using ultrasonic atomization, then irradiate the cashmere yarn with ultraviolet light, rinse and dry to obtain low-hair and anti-pilling cashmere yarn. The triggering aqueous solution of component B includes one or more of sodium tripolyphosphate, phytate, and zinc salt.
2. The method for preparing low-hair, anti-pilling cashmere yarn according to claim 1, characterized in that, In the aqueous solution of component A, the mass concentration of methacrylated carboxymethyl chitosan is 0.5–2.0 wt%, the mass concentration of polyethylene glycol diacrylate is 0.05–0.5 wt%, and the mass concentration of water-soluble photoinitiator is 0.05–0.3 wt%.
3. The method for preparing low-hair, anti-pilling cashmere yarn according to claim 1, characterized in that, In step S3, the low-temperature pre-drying temperature is 40-60℃, and the pre-drying time is 3-10 min.
4. The method for preparing low-hair, anti-pilling cashmere yarn according to claim 1, characterized in that, In step S5, the mass concentration of the triggering aqueous solution of component B is 0.1 to 1.0 wt%, the droplet size formed by ultrasonic atomization is 5 to 30 μm, and the amount of triggering aqueous solution of component B applied is 1 to 6 wt% of the cashmere yarn mass.
5. The method for preparing low-hair, anti-pilling cashmere yarn according to claim 1 or 4, characterized in that, The triggering aqueous solution of component B is a mixed aqueous solution of sodium tripolyphosphate and sodium phytate.
6. The method for preparing low-hair, anti-pilling cashmere yarn according to claim 1 or 4, characterized in that, The triggering aqueous solution of component B is a mixed aqueous solution of sodium phytate and zinc acetate.
7. The method for preparing low-hair, anti-pilling cashmere yarn according to claim 1, characterized in that, In step S5, the irradiation method of 365nm ultraviolet light is oblique incidence irradiation, ring irradiation or pulse irradiation, and the irradiation time is 30 to 120 seconds.
8. A low-hair, anti-pilling cashmere yarn, characterized in that, It is prepared by the method for preparing low-hair, anti-pilling cashmere yarn according to any one of claims 1 to 7.