An antibacterial recycled wool blended yarn and its production process

Abstract

This invention belongs to the field of textile materials technology, specifically relating to an antibacterial recycled wool blended yarn and its production process. The antibacterial recycled wool blended yarn is composed of the following raw materials in parts by weight: 35 parts recycled wool fiber, 25-33 parts LF Tencel, 15-27 parts bamboo pulp fiber or cupro fiber, 68-12 parts antibacterial nylon, and 5 parts antibacterial composite agent. The recycled wool fiber is prepared by a synergistic improved process of targeted cleaning of waste wool products with bio-enzymes and plasma etching. While retaining the natural properties of wool fiber, it also forms a surface porous structure that can combine with the antibacterial composite agent. The multi-layer structure of the blended yarn and the dynamic balance between moisture absorption and strength are achieved through Z / S double twist asynchronous spinning process, which is both environmentally friendly and commercially feasible.

Description

Technical Field

[0001] This invention belongs to the field of textile materials technology, specifically relating to an antibacterial recycled wool blended yarn and its production process. Background Technology

[0002] In the traditional textile manufacturing sector, the recycling of knitted fabric waste has long faced technological bottlenecks. Current methods for preparing recycled wool fibers largely rely on extensive processing such as mechanical crushing and carding, resulting in significant fiber length loss and surface structure damage. This makes it difficult to meet the spinning requirements of high-count yarns, and recycling value is typically only achieved through low-proportion blending or downgrading. Meanwhile, the development of antibacterial textiles on the market generally depends on finishing processes using single chemical auxiliaries, leading to problems such as short antibacterial duration, poor wash resistance, and ecotoxicity risks, making it difficult to balance environmental standards with long-lasting antibacterial requirements. Regarding the construction of blended systems, conventional processes often involve simple physical mixing of different fibers, lacking in-depth design for the complementary functions and structural synergies of fibers. In particular, the interfacial bonding strength between recycled fibers and functionalized synthetic fibers is insufficient, making it difficult to balance yarn mechanical properties and functional durability. Furthermore, increasingly stringent requirements for sustainable production in the textile industry mean that current technologies still lack systematic solutions for key aspects such as energy consumption control in waste treatment and the environmental compatibility of fiber modifiers, hindering the development of recycled textiles towards high-end and functional applications. Against this backdrop, developing composite spinning technology that combines efficient resource recycling, synergistic antibacterial effects, and optimized structural performance has become an important breakthrough in promoting the green transformation of the textile industry. Summary of the Invention

[0003] To address the above issues, this invention provides an antibacterial recycled wool blended yarn and its production process. Centered on the high-value recycling of knitting waste, it preserves the original properties of recycled wool fibers while achieving precise control of the fiber surface structure through the synergistic effect of physical etching and chemical modification. A multi-layered antibacterial network is established using fiber porosity and charge characteristics. Through a gradient structure design of core layer moisture absorption, middle layer softening, and outer layer protection, it achieves interface enhancement and performance complementarity between recycled and functional fibers, providing the textile industry with a sustainable solution that combines ecological value and commercial viability.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0005] This invention provides an antibacterial recycled wool blended yarn, the blended yarn comprising the following raw materials in parts by weight: 35 parts recycled wool fiber, 25-33 parts LF Tencel, 15-27 parts bamboo pulp fiber or cupro fiber, 68-12 parts antibacterial nylon, and 5 parts antibacterial composite agent.

[0006] Furthermore, the antibacterial compound is prepared from the following raw materials in parts by weight: 4-5 parts silver-loaded zeolite, 2 parts chitosan quaternary ammonium salt, 1.5 parts tea polyphenols, 0.5 parts zinc sulfate, 1-2 parts xanthan gum, 20-25 parts deionized water, and 20-25 parts pH 5.0 acetate buffer.

[0007] The preparation method of the antibacterial compound agent includes the following steps:

[0008] S1: Weigh 4-5 parts of silver-loaded zeolite and 20-25 parts of deionized water, mix them, and then pre-disperse them in a high-speed disperser and sonicate them in an ultrasonic reactor to obtain a dispersion. Weigh 2 parts of chitosan quaternary ammonium salt and dissolve them in 20-25 parts of pH 5.0 acetate buffer to obtain a chitosan quaternary ammonium salt solution.

[0009] S2: Weigh 1.5 parts of tea polyphenols and 0.5 parts of zinc sulfate and add them to the dispersion. Stir in a water bath at 60°C for 40 min to obtain a preliminary mixture. Slowly add the preliminary mixture to the chitosan quaternary ammonium salt solution. Homogenize in a high-speed shear emulsifier at 12000 rpm for 15 min and then stir magnetically at 500 rpm for 30 min to obtain a composite solution.

[0010] S3: Weigh 1-2 parts of xanthan gum and add them to the composite solution in several portions. Stir slowly after each addition until completely dissolved. Transfer to a vacuum degassing tank and degas for 20 minutes to obtain the antibacterial composite agent.

[0011] Furthermore, the recycled wool fiber is prepared from waste wool products after treatment with a bio-enzyme cleaning agent, a fiber repair agent, and a softening agent, specifically including the following steps:

[0012] X1: After removing chemical fiber blends from waste wool products using a photoelectric sorting system, the wool products are put into a loose untwisting machine and soaked in purified water at 40℃ for 30 min to obtain single fibers. The single fibers are placed in a pH 9.5 carbonate buffer solution at a mass ratio of 1:20, and biological enzyme cleaning agent is weighed and added to it. After 1 h, the treated single fibers are ultrasonically cleaned and dried to obtain clean fibers.

[0013] X2: The clean fiber was immersed in the fiber repair agent and treated at 45°C under vacuum for 2 hours. Then it was irradiated with microwave at 3000 MHz and 10 W / g power density for 8 minutes to obtain the repaired fiber. The repaired fiber was then treated with an atmospheric pressure low-temperature plasma system for 6 minutes with a discharge power of 300 W to obtain the activated fiber.

[0014] X3: The activated fiber is first immersed in the softening agent for 30 minutes and then taken out. The softening agent is then sprayed onto the activated fiber through a spray gun and dried and set at 85°C for 20 minutes under far-infrared radiation to obtain regenerated wool fiber.

[0015] Furthermore, the amounts of the bio-enzyme cleaning agent, fiber repair agent, and softening agent are 2.5%, 15%, and 1.2% of the mass of the waste wool products, respectively.

[0016] Furthermore, the bio-enzyme cleaning agent is composed of alkaline protease (2000 U / g) and lipase (1500 U / g) in a mass ratio of 3:1.

[0017] Furthermore, the fiber repair agent is a composite solution composed of hydroxypropyl chitosan, polyethylene glycol 4000 and trisodium citrate in a mass ratio of 5:3:2, and the total mass concentration of the composite solution is 8%.

[0018] Furthermore, the softening agent is composed of an organosilicon microemulsion (particle size ≤ 50 nm) and octadecyltrimethylammonium chloride in a mass ratio of 4:1.

[0019] This invention also provides a production process for antibacterial recycled wool blended yarn, specifically including the following steps:

[0020] Step 1: Weigh 35 parts of recycled wool fiber and 25-33 parts of LF Tencel, and mix them using a rotor spinning machine at a rotor speed of 50,000-75,000 rpm and a Z-twist coefficient of 380 T / m to obtain core yarn;

[0021] Step 2: Weigh 15-27 parts of bamboo pulp fiber or cupro fiber, and use a ring spinning system to wrap the bamboo pulp fiber or cupro fiber with the core yarn in reverse with an S twist of 700 T / m, a spindle speed of 9000-12000 rpm, and a wrapping angle of 55° to obtain the middle layer yarn. Weigh 8-12 parts of antibacterial nylon 6 and use a false twister to spirally wind the antibacterial nylon 6 with the middle layer yarn, with an overfeed rate of 6-10%, to obtain the initial blended yarn.

[0022] Step 3: Weigh 5 parts of antibacterial compound agent, atomize it with a 50 kV high-voltage electrostatic generator, and spray it onto the surface of the initial blended yarn. After spraying, fix it under a 180℃ hot roller to obtain antibacterial recycled wool blended yarn.

[0023] The beneficial effects achieved by this invention are as follows:

[0024] This invention provides an antibacterial regenerated wool blend yarn, achieving efficient regeneration and functional upgrading of waste wool resources. Through the synergistic effect of targeted bio-enzyme cleaning and plasma etching, it precisely constructs nanoscale surface pores and active structures while completely preserving the natural structure of wool fibers. This provides physical anchoring points and chemical bonding interfaces for the multi-layered loading of antibacterial components. The innovatively developed multi-element antibacterial composite system utilizes the slow-release antibacterial effect of silver-loaded zeolite, the charge adsorption and destruction of chitosan quaternary ammonium salts, and the antioxidant blocking effect of tea polyphenols to form a three-dimensional protective network, overcoming the technical bottleneck of easy failure of single antibacterial mechanisms. In the spinning process, the core layer composite of recycled wool and Tencel achieves a dynamic balance between moisture absorption and strength through Z / S double twisting asynchronously. Meanwhile, the outer spiral winding of antibacterial nylon forms a micro-nano topological structure resembling a lotus leaf surface under the action of thermo-induced deformation, creating a spatial coupling effect between antibacterial function and physical protection. This solution organically integrates the recycling of waste textiles, the molecular design of functional materials, and the biomimetic construction of yarn structure. It not only preserves the ecological attributes of natural fibers but also endows them with durable antibacterial properties that surpass those of conventional synthetic fibers, providing an innovative direction with both scientific value and practical prospects for the green transformation of the textile industry. Attached Figure Description

[0025] Figure 1 The results of the antibacterial performance evaluation of the antibacterial recycled wool blended yarns prepared in Examples 2, 4, 6 and Comparative Examples 1-2 are as follows;

[0026] Figure 2 The results of the durability study of the antibacterial recycled wool blended yarns prepared in Examples 1-6 and Comparative Examples 1-2;

[0027] Figure 3 The electron microscopy morphology characterization results of the recycled wool fibers prepared in the example before and after washing;

[0028] Figure 4 The results show the pore density and antibacterial composite agent coverage of the antibacterial recycled wool blended yarns prepared in Examples 1-6 and Comparative Examples 1-2. Detailed Implementation

[0029] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those familiar to those skilled in the art. Furthermore, any methods and materials similar to or equivalent to those described herein may be applied to this invention. The preferred embodiments and materials described herein are for illustrative purposes only and do not limit the scope of this application.

[0031] Unless otherwise specified, all methods described in the following embodiments are conventional. Unless otherwise specified, all materials used in the following embodiments and comparative examples are new materials purchased from the market.

[0032] In the following examples and comparative examples, the recycled wool fiber was prepared by treating 200 parts by weight of waste wool products with 5 parts by weight of bio-enzyme cleaning agent, 30 parts by weight of fiber repair agent and 2.4 parts by weight of softening agent;

[0033] The waste wool products mentioned above include 120 parts by weight of wool knitting scraps, 50 parts by weight of waste worsted wool yarn, and 30 parts by weight of waste blended wool clothing. All materials have been pre-cleaned and are free of foreign matter. The color fastness test results are all ≥4, and the wool content is ≥95%.

[0034] The mass ratio of alkaline protease to lipase in the bio-enzyme cleaning agent is 3:1. Before use, the alkaline protease is activated at 60°C for 40 min and the lipase is activated at 50°C for 30 min.

[0035] The fiber repair agent contains hydroxypropyl chitosan, polyethylene glycol 4000, and trisodium citrate, with the degree of deacetylation of the hydroxypropyl chitosan used being 92%.

[0036] The average particle size of the silicone microemulsion in the softening agent was 37.4 nm, and the PDI was 0.163.

[0037] The specific preparation method of the recycled wool fiber is as follows:

[0038] X1: 200 portions of waste wool products were weighed and, after infrared spectroscopy identification by a photoelectric sorting system to remove chemical fiber blends, were placed into a loose-type untwisting machine and soaked in purified water at 40℃ for 30 min to obtain single fibers. The single fibers were then placed in a pH 9.5 carbonate buffer solution at a mass ratio of 1:20, and 5 portions of a bio-enzyme cleaning agent were added to remove lipids from the wool cuticle layer of the single fibers, achieving a removal rate of 97%. After 1 h, the treated single fibers were subjected to a 28 kHz, 0.5 W / cm² cleaning process. 3 The fibers were ultrasonically cleaned and dried at power density to obtain clean fibers. The whiteness of the clean fibers was measured to be 78 by CIE.

[0039] X2: Clean fibers were immersed in 30 parts of fiber repair agent, treated at 45°C under vacuum for 2 hours, and then irradiated with microwave at 3000 MHz and 10 W / g power density for 8 minutes to obtain repaired fibers. The repaired fibers were then treated with an atmospheric pressure low-temperature plasma system for 6 minutes. The gas was a 9:1 volume ratio of helium / oxygen mixed gas, and the discharge power was 300 W to obtain activated fibers. The wet contact angle of the activated fibers was measured to be 33°.

[0040] X3: The activated fiber is first immersed in the softening agent for 30 minutes and then taken out. The softening agent is then sprayed onto the activated fiber through a spray gun and dried and shaped at 85°C for 20 minutes under far-infrared radiation to obtain regenerated wool fiber. The regenerated wool fiber has a dynamic friction coefficient of 0.15, a fiber moisture regain of 14-16%, a short fiber rate of 6.7%, and a defect content of ≤10 defects / g.

[0041] Example 1: This example provides an antibacterial recycled wool blended yarn, which comprises the following raw materials in parts by weight: 35 parts recycled wool fiber, 25 parts LF Tencel, 27 parts Modal fiber, 68 parts antibacterial nylon, and 5 parts antibacterial composite agent;

[0042] The antibacterial compound is prepared from the following raw materials in parts by weight: 4 parts silver-loaded zeolite, 2 parts chitosan quaternary ammonium salt, 1.5 parts tea polyphenols, 0.5 parts zinc sulfate, 2 parts xanthan gum, 20 parts deionized water, and 20 parts pH 5.0 acetate buffer.

[0043] The preparation method of the antibacterial compound agent includes the following steps:

[0044] S1: Weigh 4 parts of silver-loaded zeolite and 20 parts of deionized water, mix them, and then pre-disperse them in a high-speed disperser at 5000 rpm for 5 min, followed by ultrasonic reaction in an ultrasonic reactor at 40 kHz and 1.2 W / cm². 3 The mixture was sonicated at 50℃ for 20 min to obtain a dispersion. The particle size of the silver-loaded zeolite in the dispersion was measured to be 675.2 nm. Two parts of chitosan quaternary ammonium salt were weighed and dissolved in 20 parts of pH 5.0 acetate buffer to obtain a chitosan quaternary ammonium salt solution.

[0045] S2: Weigh 1.5 parts of tea polyphenols and 0.5 parts of zinc sulfate and add them to the dispersion. Stir at 800 rpm in a 60℃ water bath for 40 min. The viscosity of the solution is measured to be 206.5 mPa·s by a rotational viscometer to obtain the initial mixture. Slowly add the initial mixture to the chitosan quaternary ammonium salt solution. Homogenize in a high-speed shear emulsifier at 12000 rpm for 15 min, and then stir magnetically at 500 rpm for 30 min to obtain the composite solution.

[0046] S3: Weigh 2 parts of xanthan gum and add it to the composite solution in 3 portions. Stir slowly after each addition until completely dissolved. Transfer to a vacuum degassing tank for 20 min to degas. The viscosity was measured to be 224.1 mPa·s. After filtration through a 0.45 μm filter membrane, the antibacterial composite agent was obtained.

[0047] This embodiment also provides a production process for antibacterial recycled wool blended yarn, which specifically includes the following steps:

[0048] Step 1: Weigh 35 parts of recycled wool fiber and 25 parts of LF Tencel, and mix them using a rotor spinning machine at a rotor speed of 50,000 rpm and a Z-twist coefficient of 380 T / m to obtain core yarn;

[0049] Step 2: Weigh 27 parts of Modal fiber and use a ring spinning system to wrap the Modal fiber with the core yarn in reverse with an S twist of 700 T / m, a spindle speed of 9000 rpm, and a wrapping angle of 55° to obtain the middle layer yarn. Weigh 8 parts of antibacterial nylon 6 and use a false twister to spirally wind the antibacterial nylon 6 with the middle layer yarn, with an overfeed rate of 8%, to obtain the initial blended yarn.

[0050] Step 3: Weigh 5 parts of antibacterial compound agent, atomize it with a 50 kV high-voltage electrostatic generator, and spray it onto the surface of the initial blended yarn. After spraying, fix it under a 180℃ hot roller to obtain antibacterial recycled wool blended yarn.

[0051] Example 2: This example provides an antibacterial recycled wool blended yarn, which comprises the following raw materials in parts by weight: 35 parts recycled wool fiber, 30 parts LF Tencel, 20 parts Modal fiber, 10 parts antibacterial nylon 6, and 5 parts antibacterial composite agent;

[0052] The antibacterial compound is prepared from the following raw materials in parts by weight: 5 parts silver-loaded zeolite, 2 parts chitosan quaternary ammonium salt, 1.5 parts tea polyphenols, 0.5 parts zinc sulfate, 1 part xanthan gum, 25 parts deionized water, and 25 parts pH 5.0 acetate buffer.

[0053] The preparation method of the antibacterial compound agent includes the following steps:

[0054] S1: Weigh 5 parts of silver-loaded zeolite and 25 parts of deionized water, mix them, and then pre-disperse them in a high-speed disperser at 5000 rpm for 5 min, followed by ultrasonic reaction in an ultrasonic reactor at 40 kHz and 1.2 W / cm². 3 The mixture was sonicated at 50℃ for 20 min to obtain a dispersion. The particle size of the silver-loaded zeolite in the dispersion was measured to be 658.3 nm. Two parts of chitosan quaternary ammonium salt were weighed and dissolved in 25 parts of pH 5.0 acetate buffer to obtain a chitosan quaternary ammonium salt solution.

[0055] S2: Weigh 1.5 parts of tea polyphenols and 0.5 parts of zinc sulfate and add them to the dispersion. Stir at 800 rpm in a 60℃ water bath for 40 min. The viscosity of the solution was measured to be 204.7 mPa·s by a rotational viscometer to obtain the initial mixture. Slowly add the initial mixture to the chitosan quaternary ammonium salt solution. Homogenize in a high-speed shear emulsifier at 12000 rpm for 15 min, and then stir magnetically at 500 rpm for 30 min to obtain the composite solution.

[0056] S3: Weigh 1 part xanthan gum and add it to the composite solution in 2 portions. Stir slowly after each addition until completely dissolved. Transfer to a vacuum degassing tank for 20 min to degas. The viscosity was measured to be 213.5 mPa·s. After filtration through a 0.45 μm filter membrane, the antibacterial composite agent was obtained.

[0057] This embodiment also provides a production process for antibacterial recycled wool blended yarn, which specifically includes the following steps:

[0058] Step 1: Weigh 35 parts of recycled wool fiber and 30 parts of LF Tencel, and mix them using a rotor spinning machine at a rotor speed of 50,000 rpm and a Z-twist coefficient of 380 T / m to obtain core yarn;

[0059] Step 2: Weigh 20 parts of Modal fiber and use a ring spinning system to wrap the Modal fiber with the core yarn in the opposite direction with an S twist of 700 T / m, a spindle speed of 9000 rpm, and a wrapping angle of 55° to obtain the middle layer yarn. Weigh 10 parts of antibacterial nylon 6 and use a false twister to spirally wind the antibacterial nylon 6 with the middle layer yarn, with an overfeed rate of 12%, to obtain the initial blended yarn.

[0060] Step 3: Weigh 5 parts of antibacterial compound agent, atomize it with a 50 kV high-voltage electrostatic generator, and spray it onto the surface of the initial blended yarn. After spraying, fix it under a 180℃ hot roller to obtain antibacterial recycled wool blended yarn.

[0061] Example 3: This example provides an antibacterial recycled wool blended yarn, which comprises the following raw materials in parts by weight: 35 parts recycled wool fiber, 30 parts LF Tencel, 20 parts Lyocell fiber, 10 parts antibacterial nylon 6, and 5 parts antibacterial composite agent;

[0062] The antibacterial compound is prepared from the following raw materials in parts by weight: 4 parts silver-loaded zeolite, 2 parts chitosan quaternary ammonium salt, 1.5 parts tea polyphenols, 0.5 parts zinc sulfate, 2 parts xanthan gum, 20 parts deionized water, and 20 parts pH 5.0 acetate buffer.

[0063] The preparation method of the antibacterial compound agent includes the following steps:

[0064] S1: Weigh 4 parts of silver-loaded zeolite and 20 parts of deionized water, mix them, and then pre-disperse them in a high-speed disperser at 5000 rpm for 5 min, followed by ultrasonic reaction in an ultrasonic reactor at 40 kHz and 1.2 W / cm². 3 The mixture was sonicated at 50℃ for 20 min to obtain a dispersion. The particle size of the silver-loaded zeolite in the dispersion was measured to be 688.6 nm. Two parts of chitosan quaternary ammonium salt were weighed and dissolved in 20 parts of pH 5.0 acetate buffer to obtain a chitosan quaternary ammonium salt solution.

[0065] S2: Weigh 1.5 parts of tea polyphenols and 0.5 parts of zinc sulfate and add them to the dispersion. Stir at 800 rpm in a 60℃ water bath for 40 min. The viscosity of the solution was measured to be 209.3 mPa·s by a rotational viscometer to obtain the initial mixture. Slowly add the initial mixture to the chitosan quaternary ammonium salt solution. Homogenize in a high-speed shear emulsifier at 12000 rpm for 15 min, and then magnetically stir at 500 rpm for 30 min to obtain the composite solution.

[0066] S3: Weigh 2 parts of xanthan gum and add it to the composite solution in 3 portions. Stir slowly after each addition until completely dissolved. Transfer to a vacuum degassing tank for 20 min to degas. The viscosity was measured to be 219.4 mPa·s. After filtration through a 0.45 μm filter membrane, the antibacterial composite agent was obtained.

[0067] This embodiment also provides a production process for antibacterial recycled wool blended yarn, which specifically includes the following steps:

[0068] Step 1: Weigh 35 parts of recycled wool fiber and 30 parts of LF Tencel, and mix them using a rotor spinning machine at a rotor speed of 60,000 rpm and a Z-twist coefficient of 380 T / m to obtain core yarn;

[0069] Step 2: Weigh 20 parts of Lyocell fiber and use a ring spinning system to wrap the Lyocell fiber with the core yarn in the opposite direction with an S twist of 700 T / m, a spindle speed of 10000 rpm, and a wrapping angle of 55° to obtain the middle layer yarn. Weigh 10 parts of antibacterial nylon 6 and use a false twister to spirally wind the antibacterial nylon 6 with the middle layer yarn, with an overfeed rate of 8%, to obtain the initial blended yarn.

[0070] Step 3: Weigh 5 parts of antibacterial compound agent, atomize it with a 50 kV high-voltage electrostatic generator, and spray it onto the surface of the initial blended yarn. After spraying, fix it under a 180℃ hot roller to obtain antibacterial recycled wool blended yarn.

[0071] Example 4: This example provides an antibacterial recycled wool blended yarn, which comprises the following raw materials in parts by weight: 35 parts recycled wool fiber, 33 parts LF Tencel, 15 parts Lyocell fiber, 12 parts antibacterial nylon 6, and 5 parts antibacterial composite agent;

[0072] The antibacterial compound is prepared from the following raw materials in parts by weight: 5 parts silver-loaded zeolite, 2 parts chitosan quaternary ammonium salt, 1.5 parts tea polyphenols, 0.5 parts zinc sulfate, 1 part xanthan gum, 25 parts deionized water, and 25 parts pH 5.0 acetate buffer.

[0073] The preparation method of the antibacterial compound agent includes the following steps:

[0074] S1: Weigh 5 parts of silver-loaded zeolite and 25 parts of deionized water, mix them, and then pre-disperse them in a high-speed disperser at 5000 rpm for 5 min, followed by ultrasonic reaction in an ultrasonic reactor at 40 kHz and 1.2 W / cm². 3 The mixture was sonicated at 50℃ for 20 min to obtain a dispersion. The particle size of the silver-loaded zeolite in the dispersion was measured to be 661.3 nm. Two parts of chitosan quaternary ammonium salt were weighed and dissolved in 25 parts of pH 5.0 acetate buffer to obtain a chitosan quaternary ammonium salt solution.

[0075] S2: Weigh 1.5 parts of tea polyphenols and 0.5 parts of zinc sulfate and add them to the dispersion. Stir at 800 rpm in a 60℃ water bath for 40 min. The viscosity of the solution is measured to be 214.7 mPa·s by a rotational viscometer to obtain the initial mixture. Slowly add the initial mixture to the chitosan quaternary ammonium salt solution. Homogenize in a high-speed shear emulsifier at 12000 rpm for 15 min, and then stir magnetically at 500 rpm for 30 min to obtain the composite solution.

[0076] S3: Weigh 1 part xanthan gum and add it to the composite liquid in 2 portions. Stir slowly after each addition until completely dissolved. Transfer to a vacuum degassing tank for 20 min to degas. The viscosity was measured to be 207.9 mPa·s. After filtration through a 0.45 μm filter membrane, the antibacterial composite agent was obtained.

[0077] This embodiment also provides a production process for antibacterial recycled wool blended yarn, which specifically includes the following steps:

[0078] Step 1: Weigh 35 parts of recycled wool fiber and 33 parts of LF Tencel, and mix them using a rotor spinning machine at a speed of 75,000 rpm and a Z-twist coefficient of 380 T / m to obtain core yarn;

[0079] Step 2: Weigh 15 parts of Lyocell fiber and use a ring spinning system to wrap the Lyocell fiber with the core yarn in the opposite direction with an S twist of 700 T / m. The spindle speed is 12000 rpm and the wrapping angle is 55° to obtain the middle layer yarn. Weigh 12 parts of antibacterial nylon 6 and use a false twister to spirally wind the antibacterial nylon 6 with the middle layer yarn. The overfeed rate is 10% to obtain the initial blended yarn.

[0080] Step 3: Weigh 5 parts of antibacterial compound agent, atomize it with a 50 kV high-voltage electrostatic generator, and spray it onto the surface of the initial blended yarn. After spraying, fix it under a 180℃ hot roller to obtain antibacterial recycled wool blended yarn.

[0081] Example 5: This example provides an antibacterial recycled wool blended yarn, which comprises the following raw materials in parts by weight: 35 parts recycled wool fiber, 33 parts LF Tencel, 15 parts bamboo pulp fiber, 12 parts antibacterial nylon 6, and 5 parts antibacterial composite agent;

[0082] The antibacterial compound is prepared from the following raw materials in parts by weight: 5 parts silver-loaded zeolite, 2 parts chitosan quaternary ammonium salt, 1.5 parts tea polyphenols, 0.5 parts zinc sulfate, 1 part xanthan gum, 25 parts deionized water, and 25 parts pH 5.0 acetate buffer.

[0083] The preparation method of the antibacterial compound agent includes the following steps:

[0084] S1: Weigh 5 parts of silver-loaded zeolite and 25 parts of deionized water, mix them, and then pre-disperse them in a high-speed disperser at 5000 rpm for 5 min, followed by ultrasonic reaction in an ultrasonic reactor at 40 kHz and 1.2 W / cm². 3 The mixture was sonicated at 50℃ for 20 min to obtain a dispersion. The particle size of the silver-loaded zeolite in the dispersion was measured to be 664.8 nm. Two parts of chitosan quaternary ammonium salt were weighed and dissolved in 25 parts of pH 5.0 acetate buffer to obtain a chitosan quaternary ammonium salt solution.

[0085] S2: Weigh 1.5 parts of tea polyphenols and 0.5 parts of zinc sulfate and add them to the dispersion. Stir at 800 rpm in a 60℃ water bath for 40 min. The viscosity of the solution was measured to be 215.2 mPa·s by a rotational viscometer to obtain the initial mixture. Slowly add the initial mixture to the chitosan quaternary ammonium salt solution. Homogenize in a high-speed shear emulsifier at 12000 rpm for 15 min, and then magnetically stir at 500 rpm for 30 min to obtain the composite solution.

[0086] S3: Weigh 1 part xanthan gum and add it to the composite solution in 2 portions. Stir slowly after each addition until completely dissolved. Transfer to a vacuum degassing tank for 20 min to degas. The viscosity was measured to be 211.4 mPa·s. After filtration through a 0.45 μm filter membrane, the antibacterial composite agent was obtained.

[0087] This embodiment also provides a production process for antibacterial recycled wool blended yarn, which specifically includes the following steps:

[0088] Step 1: Weigh 35 parts of recycled wool fiber and 30 parts of LF Tencel, and mix them using a rotor spinning machine at a rotor speed of 75,000 rpm and a Z-twist coefficient of 380 T / m to obtain core yarn;

[0089] Step 2: Weigh 20 parts of bamboo pulp fiber and use a ring spinning system to wrap the bamboo pulp fiber with the core yarn in reverse with an S twist of 700 T / m. The spindle speed is 12000 rpm and the wrapping angle is 55° to obtain the middle layer yarn. Weigh 10 parts of antibacterial nylon 6 and use a false twister to spirally wind the antibacterial nylon 6 with the middle layer yarn. The overfeed rate is 10% to obtain the initial blended yarn.

[0090] Step 3: Weigh 5 parts of antibacterial compound agent, atomize it with a 50 kV high-voltage electrostatic generator, and spray it onto the surface of the initial blended yarn. After spraying, fix it under a 180℃ hot roller to obtain antibacterial recycled wool blended yarn.

[0091] Example 6: This example provides an antibacterial recycled wool blended yarn, which comprises the following raw materials in parts by weight: 35 parts recycled wool fiber, 33 parts LF Tencel, 15 parts cupro fiber, 12 parts antibacterial nylon 6, and 5 parts antibacterial composite agent;

[0092] The antibacterial compound is prepared from the following raw materials in parts by weight: 5 parts silver-loaded zeolite, 2 parts chitosan quaternary ammonium salt, 1.5 parts tea polyphenols, 0.5 parts zinc sulfate, 1 part xanthan gum, 25 parts deionized water, and 25 parts pH 5.0 acetate buffer.

[0093] The preparation method of the antibacterial compound agent includes the following steps:

[0094] S1: Weigh 5 parts of silver-loaded zeolite and 25 parts of deionized water, mix them, and then pre-disperse them in a high-speed disperser at 5000 rpm for 5 min, followed by ultrasonic reaction in an ultrasonic reactor at 40 kHz and 1.2 W / cm². 3 The mixture was sonicated at 50℃ for 20 min to obtain a dispersion. The particle size of the silver-loaded zeolite in the dispersion was measured to be 673.5 nm. Two parts of chitosan quaternary ammonium salt were weighed and dissolved in 25 parts of pH 5.0 acetate buffer to obtain a chitosan quaternary ammonium salt solution.

[0095] S2: Weigh 1.5 parts of tea polyphenols and 0.5 parts of zinc sulfate and add them to the dispersion. Stir at 800 rpm in a 60℃ water bath for 40 min. The viscosity of the solution is measured to be 212.0 mPa·s by a rotational viscometer to obtain the initial mixture. Slowly add the initial mixture to the chitosan quaternary ammonium salt solution. Homogenize in a high-speed shear emulsifier at 12000 rpm for 15 min, and then stir magnetically at 500 rpm for 30 min to obtain the composite solution.

[0096] S3: Weigh 1 part xanthan gum and add it to the composite solution in 2 portions. Stir slowly after each addition until completely dissolved. Transfer to a vacuum degassing tank for 20 min to degas. The viscosity was measured to be 208.7 mPa·s. After filtration through a 0.45 μm filter membrane, the antibacterial composite agent was obtained.

[0097] This embodiment also provides a production process for antibacterial recycled wool blended yarn, which specifically includes the following steps:

[0098] Step 1: Weigh 35 parts of recycled wool fiber and 30 parts of LF Tencel, and mix them using a rotor spinning machine at a rotor speed of 75,000 rpm and a Z-twist coefficient of 380 T / m to obtain core yarn;

[0099] Step 2: Weigh 20 parts of cupro fiber and use a ring spinning system to wrap the cupro fiber with the core yarn in reverse with an S twist of 700 T / m. The spindle speed is 12000 rpm and the wrapping angle is 55° to obtain the middle layer yarn. Weigh 10 parts of antibacterial nylon 6 and use a false twister to spirally wind the antibacterial nylon 6 with the middle layer yarn. The overfeed rate is 10% to obtain the initial blended yarn.

[0100] Step 3: Weigh 5 parts of antibacterial compound agent, atomize it with a 50 kV high-voltage electrostatic generator, and spray it onto the surface of the initial blended yarn. After spraying, fix it under a 180℃ hot roller to obtain antibacterial recycled wool blended yarn.

[0101] The difference between Comparative Example 1 and Example 2 is that the same weight of newly made wool fibers were used instead of recycled wool fibers in the preparation process, while the rest of the process was the same as in Example 2.

[0102] The difference between Comparative Example 2 and Example 4 is that an equal weight of purified water was used instead of the antibacterial compound for preparation, while the rest of the preparation was the same as Example 4.

[0103] Mechanical performance evaluation

[0104] The performance of blended yarns was tested according to ISO 2062 and ASTM D2256 standards. Blended yarn samples prepared in Examples 1-6 and Comparative Examples 1-2 were equilibrated in a standard temperature and humidity environment for 24 h, and tested using a constant-speed elongation tensile tester (CRE type). The clamping distance was set to 500 mm, and the stretching speed was 500 mm / min. Each group of samples was tested 30 times, and the average value was taken. Breaking strength was calculated by the ratio of maximum breaking force to yarn linear density, and breaking elongation was obtained by dividing the elongation at break by the initial length. Hairiness index was tested using a photoelectric hairiness meter, with hair length of 3 mm and above as the statistical standard. The yarn passed through the detection zone at a speed of 50 m / min, and the number of hairs within a length of 10 m was counted cumulatively. Yarn evenness was measured using an Uster yarn evenness meter. The yarn passed through a capacitive sensor at a speed of 400 m / min, and the coefficient of variation (CV%) of mass within a length of 100 m was recorded. During the test, the yarn tension had to be kept constant (0.5 cN / tex), and external vibration interference had to be eliminated. The test results are shown in Table 1.

[0105] Antibacterial performance test

[0106] The antibacterial properties were quantitatively evaluated according to the AATCC 100 standard. The blended yarn samples prepared in Examples 2, 4, 6 and Comparative Examples 1-2 were cut into circular specimens with a diameter of 4.8 ± 0.1 cm. After ultraviolet sterilization for 30 min, they were impregnated with a solution containing 1 × 10⁻⁶ micrograms of styrene. 3 In a bacterial suspension of CFU / mL *Escherichia coli* (ATCC 25922) or *Staphylococcus aureus* (ATCC 6538), ensuring complete saturation of the fiber, the inoculated sample was placed in a sterile sealed bag and incubated at 37°C for 24 h. After incubation, 100 mL of neutralization solution (physiological saline containing 0.5% Tween 80) was added, and the sample was vortexed for 2 min to elute residual bacteria. 1 mL of the eluent was serially diluted and plated onto nutrient agar plates. After incubation at 37°C for 48 h, colony-forming units (CFU) were counted. The inhibition rate was calculated as (CFU of blank control group - CFU of sample group) / CFU of blank control group × 100%. Washability testing was performed according to GB / T 3921-2008 standard, using a solution containing 0.5% standard detergent (40°C) at a 1:50 liquor ratio, with each cycle consisting of 30 min of vortexing. This cycle was repeated 50 times before testing the inhibition rate. The results are shown in [Figure number missing]. Figure 1 .

[0107] Durability test

[0108] Silver ion retention was determined using inductively coupled plasma optical emission spectroscopy (ICP-OES). The blended yarn samples prepared in Examples 1-6 and Comparative Examples 1-2 were washed 50 times and then microwave-digested (nitric acid-hydrofluoric acid system). After being brought to a final volume of 50 mL, the silver content was determined by ICP-OES, and the retention rate was calculated by comparing it with that of the unwashed samples. The breaking strength retention was tested under the same physical and mechanical property testing conditions, comparing the changes in breaking strength before and after washing. To eliminate testing errors, each group of samples was tested in parallel five times. During the washing process, the water temperature (40±2℃) and the mechanical action intensity (oscillation frequency 120 rpm) were strictly controlled to ensure the consistency of the experimental conditions. The results are shown in […]. Figure 2 .

[0109] Fiber surface morphology characterization

[0110] The microstructure of regenerated wool fibers was observed using field emission scanning electron microscopy (FE-SEM). The prepared regenerated wool fiber samples and the regenerated wool fiber samples after 10 washes were fixed on conductive adhesive, and a 5 nm thick gold film was deposited by ion sputtering to enhance conductivity. Observations were then performed under conditions of an accelerating voltage of 5 kV and a working distance of 8 mm. The FE-SEM results of the regenerated wool fibers before and after washing are shown in the figure. Figure 3; After the blended yarn samples prepared in Examples 1-6 and Comparative Examples 1-2 were treated in the same way, the surface pore distribution and antibacterial agent adhesion were analyzed. For pore density statistics, 10 different fields of view (magnification 5000×) were selected, and the number of pores per unit area was calculated using ImageJ image processing software. The antibacterial agent coverage was determined by energy dispersive spectroscopy (EDS) combined with surface scanning mode, and the proportion of silver element distribution area to the total surface area was statistically analyzed. The results of pore density and antibacterial composite agent coverage are shown in the figure. Figure 4 .

[0111] Environmental indicator testing

[0112] Water consumption was measured according to GB / T 7119 standard. The calculation was based on the cumulative water consumption per ton of blended yarn produced (including washing, rinsing, and setting processes). Wastewater COD was determined using the potassium dichromate method. Samples of mixed wastewater discharged during production were taken, digested, and their absorbance was measured at 620 nm. The COD concentration was calculated by comparing with a standard curve. Raw material cost accounting included direct material costs such as waste wool procurement, enzyme preparations, antibacterial compound agents, and functional fibers. The total cost was calculated per production batch and then converted to the cost per ton of finished product. During testing, it was necessary to ensure the representativeness of wastewater sampling (instantaneous samples were collected every 30 minutes, and a combined sample was collected every 24 minutes), and to exclude indirect costs such as equipment depreciation and energy consumption. The results are shown in Table 2.

[0113] Table 1 Mechanical properties of blended yarns

[0114]

[0115] Table 1 shows that Example 4 benefited from the dense core structure formed by high-speed spinning and the high modulus characteristics of Lyocell fibers, while Comparative Example 2 had a lower breaking strength of 17.3 cN / tex and a higher hairiness index of 6.8 fibers / m due to the increased coefficient of friction between fibers, thus verifying the protective effect of the antibacterial coating on the integrity of the yarn structure.

[0116] Figure 1 Antibacterial performance tests showed that the blended yarn prepared in Example 4 had an antibacterial rate of 99.9%, while Example 6 (cuprammonium fiber + silver-loaded zeolite, antibacterial rate of 99.7%) achieved a high antibacterial effect due to the antibacterial properties of the fiber itself and the synergistic effect of the composite agent. The high loading of silver-loaded zeolite (5%) and the ion release mechanism of cuprammonium fiber formed a dual bactericidal pathway. In contrast, Comparative Example 2 relied solely on physical barrier and the antibacterial effect of the fiber itself, with an antibacterial rate of less than 75%, highlighting the necessity of surface etching and the addition of antibacterial composite agents in the regeneration process.

[0117] Figure 2Durability testing results showed that after 50 washes, Example 4 retained 93.5% of the silver ions, which was attributed to the physical locking of the silver-loaded zeolite by the dense porous structure of Lyocell fibers and the chemical bonding of chitosan quaternary ammonium salt. In contrast, Example 5 (bamboo pulp fiber) had a silver ion retention rate of only 82.9% due to the smooth fiber surface leading to weak binding force of the antibacterial composite agent, and the breaking strength retention rate (86.4%) was also the lowest, confirming the important influence of fiber type on functional durability.

[0118] Figure 3 The results showed that the structure of the recycled wool fibers changed significantly before and after washing, exhibiting high mechanical strength, stable properties and structure, and resistance to breakage.

[0119] Figure 4 The results showed that the blended yarn prepared in Comparative Example 1 using freshly made wool fibers instead of recycled wool fibers had lower pore density and antibacterial compound coverage than the blended yarn prepared in Example 2. The blended yarns prepared in Examples 2 and 4 had similar pore densities and antibacterial compound coverage of over 85%, with the blended yarn prepared in Example 4 achieving a pore density and antibacterial compound coverage of 16.5 pores / μm. 2 With a success rate of 92.7%, the performance was superior, indicating the key role of the regeneration process in surface activation.

[0120] Table 2 Environmental Indicator Testing

[0121]

[0122] Table 2 shows that the process water consumption and wastewater COD value of the blended yarn prepared by the newly produced wool fiber in Comparative Example 1 were 32.7 tons / ton of product and 145 mg / L, respectively, which were significantly higher than the process indicators of the blended yarn prepared by the recycled wool fiber in Examples 2 and 4. This indicates that the process of this scheme is a breakthrough in resource efficiency and clean production.

[0123] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

[0124] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention. The actual application is not limited to this. In conclusion, if those skilled in the art are inspired by this description and design similar methods and embodiments without departing from the spirit of the present invention, they should all fall within the protection scope of the present invention.

Claims

1. An antibacterial recycled wool blended yarn, characterized in that, The blended yarn comprises the following raw materials in parts by weight: 35 parts recycled wool fiber, 25-33 parts LF Tencel, 15-27 parts bamboo pulp fiber or cupro fiber, 68-12 parts antibacterial nylon and 5 parts antibacterial compound agent; The recycled wool fiber is prepared from waste wool products by treating them with a bio-enzyme cleaning agent, a fiber repair agent, and a softening agent, specifically including the following steps: X1: Detwisting waste wool products and treating them with a bio-enzyme cleaning agent to obtain clean fibers; X2: Clean fibers are immersed in fiber repair agent and then microwave irradiated, followed by treatment with an atmospheric pressure low-temperature plasma system to obtain activated fibers; X3: Apply softening agent to activated fibers, dry and set to obtain regenerated wool fibers; The antibacterial compound is prepared from the following raw materials in parts by weight: 4-5 parts silver-loaded zeolite, 2 parts chitosan quaternary ammonium salt, 1.5 parts tea polyphenols, 0.5 parts zinc sulfate, 1-2 parts xanthan gum, 20-25 parts deionized water, and 20-25 parts pH 5.0 acetate buffer. The preparation method of the antibacterial compound includes the following steps: S1: Mix and pre-disperse silver-loaded zeolite and deionized water to obtain a dispersion. Dissolve chitosan quaternary ammonium salt in pH 5.0 acetate buffer to obtain a chitosan quaternary ammonium salt solution. S2: Weigh tea polyphenols and zinc sulfate and add them to the dispersion for initial mixing. Then add chitosan quaternary ammonium salt solution and homogenize to obtain a composite solution. S3: Add xanthan gum to the composite solution to dissolve and degas, and obtain an antibacterial composite agent; The amounts of the bio-enzyme cleaning agent, fiber repair agent, and softening agent used are 2.5%, 15%, and 1.2% of the mass of the waste wool products, respectively. The bio-enzyme cleaning agent is composed of alkaline protease and lipase in a mass ratio of 3:

1. The fiber repair agent is a composite solution composed of hydroxypropyl chitosan, polyethylene glycol 4000 and trisodium citrate in a mass ratio of 5:3:

2. The softening agent is composed of an organosilicon microemulsion and octadecyltrimethylammonium chloride in a mass ratio of 4:

1.

2. A production process for an antibacterial recycled wool blended yarn according to claim 1, characterized in that, Specifically, the steps include the following: Step 1: Weigh out the recycled wool fibers and LF Tencel and blend them to obtain the core yarn; Step 2: After wrapping the core yarn with bamboo pulp fiber or cupro fiber, it is then wound with antibacterial nylon 6 to obtain the initial blended yarn; Step 3: Weigh out the antibacterial compound agent, atomize it, and spray it onto the surface of the initial blended yarn. Set the yarn to obtain antibacterial recycled wool blended yarn.

3. The production process of an antibacterial recycled wool blended yarn according to claim 2, characterized in that, In step 1, the yarn mixing process uses the Z-twist process, and in step 2, the process of wrapping the core yarn with bamboo pulp fiber or cupro fiber uses the S-twist process.

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