Wrapped yarn and preparation method thereof

Abstract

The invention belongs to the technical field of textiles, and particularly relates to wrap yarn and a preparation method thereof. A first outer wrap yarn and a second outer wrap yarn wrap the outside of a core yarn, the first outer wrap yarn is phase-change temperature-adjusting polyester fiber, an organic low-temperature phase-change compound serves as a phase-change heat storage material, an acrylic polymer serves as a wall material, phase-change microspheres are prepared through suspension polymerization, and the second outer wrap yarn is a phase-change temperature-adjusting polyester fiber. Mixing with silane coupling agent modified inorganic powder, performing surface modification by using a temperature-sensitive polymer to obtain a phase-change temperature-adjusting microsphere finishing liquid, and coating the polyester fiber with the phase-change temperature-adjusting microsphere finishing liquid to obtain the phase-change temperature-adjusting microsphere finishing liquid. The second outer wrap yarn is antibacterial cotton fiber, and the core yarn is chinlon stretch yarn; the prepared wrap yarn has good mechanical property, deodorization property and antibacterial property.

Description

Technical Field

[0001] The invention belongs to the technical field of textiles, and in particular relates to a coated yarn and a preparation method thereof. Background Art

[0002] In recent years, people have begun to pay more attention to the quality of life, and the demand for functional textiles has continued to increase. They are no longer satisfied with the basic warmth and decoration. Covered yarn, also known as wrapped yarn, is a new type of yarn structure. It uses filament or staple fiber as the yarn core and is covered with another filament or staple fiber yarn. The outer yarn covers the core yarn in a spiral manner. The purpose of developing this yarn is to utilize the characteristics of two or more fiber components at the same time. At present, the functions of functional textiles on the market mainly include antibacterial and deodorizing, anti-adhesion, hydrophobic and oleophobic, UV resistance, far infrared, negative ionization, fire retardant, conductivity and high water absorption.

[0003] The Chinese patent with announcement number CN114622316B discloses a polylactic acid bio-based functional coated yarn for sweaters and a preparation method thereof, comprising a core yarn and an outer coated yarn, wherein the core yarn is an elastic yarn, and the outer coated yarn comprises a first outer coated yarn and a second outer coated yarn, wherein the first outer coated yarn is a metal microfilament, and the second outer coated yarn is a PLA bio-based filament. The addition of the metal microfilament enhances the biodegradability of the sweater and improves the skin-friendliness of the sweater. The addition of wool fiber ensures the warmth retention of the sweater while reducing the The processing cost of low-poly sweaters; the Chinese patent with publication number CN118932576A discloses a manufacturing process of soft ultra-fine coated yarn, wherein the obtained modified polyurethane is spun to obtain modified spandex filaments, and the modified spandex filaments are used as core yarns, and the outer yarns are spirally coated on the core yarns to obtain soft ultra-fine coated yarns. The coated yarns obtained by the method of the present invention are relatively fine, and have excellent softness, antistatic properties, anti-ultraviolet properties, mechanical properties and heat insulation effects. The obtained products are more dense and thin. However, in daily life, the temperature changes too quickly in bad weather, and how to improve the comfort of consumers wearing in bad environments has become a focus of attention. Summary of the invention

[0004] In view of the problems existing in the prior art, the present invention provides a covered yarn and a preparation method thereof, which is obtained by weaving a first outer covered yarn and a second outer covered yarn wrapped around the outside of a core yarn, wherein the first outer covered yarn is a phase change temperature regulating polyester fiber, the second outer covered yarn is an antibacterial cotton fiber, and the core yarn is a nylon stretch yarn. The prepared covered yarn has good mechanical properties, deodorizing properties and antibacterial properties.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is as follows: A covered yarn, comprising a core yarn and an outer covered yarn, wherein the outer covered yarn comprises a first outer covered yarn and a second outer covered yarn; the core yarn is a nylon stretch yarn, the first outer covered yarn is a phase-change temperature-regulating polyester fiber, and the second outer covered yarn is an antibacterial cotton fiber; The preparation method of the phase-change temperature-regulating polyester fiber comprises: using an organic low-temperature phase-change compound as a phase-change heat storage material and an acrylic polymer as a wall material, preparing phase-change microspheres by suspension polymerization, mixing with an inorganic powder modified by a silane coupling agent, and then performing surface modification with a thermosensitive polymer to obtain a phase-change temperature-regulating microsphere finishing liquid, coating the microspheres on polyester fibers, and obtaining the phase-change temperature-regulating polyester fibers; The preparation method of the antibacterial cotton fiber comprises: modifying the cotton fiber with a water-soluble high molecular polymer binder and then introducing an inorganic antibacterial agent to obtain the antibacterial cotton fiber.

[0006] Coated yarn is a kind of yarn composed of two or more fibers. Compared with ordinary yarn, it can give full play to the advantages of different fibers and make up for the shortcomings. Nylon has good wear resistance, elasticity and elastic recovery, but its heat resistance and light resistance are relatively poor. Therefore, it is used as the core yarn in the present invention to avoid direct contact with heat sources and direct light. Polyester has good wear resistance, high temperature resistance and dimensional stability, but it is inelastic and has poor hygroscopicity. Therefore, it is surface-coated and modified using phase change thermostatic materials, inorganic adsorption materials and thermosensitive polymers to improve elasticity while giving it a certain intelligent thermostatic effect, thereby improving comfort. Cotton fiber has good hygroscopicity and heat preservation. Therefore, it is used as the second outer coated yarn to cooperate with polyester to improve the hygroscopicity and air permeability of the fabric, and further introduce inorganic antibacterial particles to make the prepared yarn have good antibacterial properties.

[0007] Furthermore, the preparation method of the phase change temperature regulating polyester fiber is specifically as follows: S1. Evenly mix n-octadecane, butyl stearate, methyl methacrylate, a crosslinking agent and an initiator, and then ultrasonically disperse them for 10-20 minutes. Then add an emulsifier solution, raise the temperature to 30-40°C, stir and disperse for 10-20 minutes, then raise the temperature to 80-90°C and stir for 6-10 hours. After separation by suction filtration, washing and drying, phase change microspheres are obtained; wherein the crosslinking agent is pentaerythritol tetraacrylate or ethylene glycol dimethacrylate, the initiator is any one of azobisisobutyronitrile, azobisisoheptanenitrile, dimethyl azobisisobutyrate, azobisisobutyramidine hydrochloride, and azobisisobutylimidazoline hydrochloride, or a mixture thereof; and the emulsifier is any one of sodium lauryl sulfate, monoglyceride of laurate, glyceryl stearate, and cetyl palmitate, or a mixture thereof; Phase change materials can store or release a large amount of heat when the temperature changes, provide a buffering effect in bad weather, and provide consumers with long-term thermal comfort. The phase change temperature of n-octadecane and butyl stearate is close to the comfortable temperature of the human body. They have the same long-chain alkyl group and can form a eutectic mixture. The phase change temperature can be adjusted to the comfortable temperature range of the human body (15-35°C) through a suitable ratio. Polymethacrylic acid is a highly transparent plastic with high chemical stability, good mechanical properties and biocompatibility. It is non-toxic and harmless to the human body and is a good wall material for preparing microspheres. Therefore, in the present invention, n-octadecane and butyl stearate are used as phase change core materials; polymethyl methacrylate is used as wall material, and phase change microspheres are prepared by suspension polymerization. The phase change material can be protected by coating the phase change material inside to prevent leakage during the reaction.

[0008] S2, adding the pretreated opal powder to water, ultrasonically dispersing to obtain a suspension, adding a silane coupling agent solution thereto, raising the temperature to 30-45°C and stirring for 6-8h, adding phase change microspheres thereto, continuing stirring for 3-5h and centrifuging, and obtaining silane coupling agent modified opal coated phase change microspheres after drying; wherein the pretreatment process of the opal powder is: placing the opal powder in a ball mill, adding water and a dispersant and then ball milling; the ball-to-material mass ratio is 3-6:1, the ball mill revolution speed is 200-300r / min, the grinding time is 2-5h, and the mass ratio of the opal powder, water and dispersant is 20-40:5-8:0.25-0.32; In life, after exercise or in hot weather, it is inevitable to emit unpleasant sweat odor. Deodorants have the function of absorbing or neutralizing body odor, so that the produced sweat odor can be eliminated to a large extent, and play a passive adsorption role in reducing human body odor. Opal is mainly composed of silicon dioxide, has a large number of pore-like micropores, and has a relatively large specific surface area, which is conducive to adsorption, so it is often used as an adsorption material. In order to make opal meet textile requirements, it is ultra-finely treated by a planetary ball mill. Since opal powder is prone to agglomeration or even agglomeration with static electricity, wet grinding is adopted. Adding a dispersant during the grinding process can play an electrostatic stabilization role, thereby fully grinding the powder. In order to further promote the dispersion of the ground opal powder, a silane coupling agent is used to coat and modify its surface. The silane coupling agent can react chemically with the hydroxyl groups on the surface of the inorganic particles to form a chemical bond connection, and a layer of organic coating film is covered on its surface to form a steric hindrance between the inorganic particles, effectively preventing the agglomeration between the particles, thereby improving its dispersibility in the medium. In addition, one end of the organic functional group in the silane coupling agent can react with the organic material, namely polymethyl methacrylate, or produce a strong intermolecular force, so that the silane coupling agent forms a strong bond between the inorganic opal powder and the surface of the phase change microspheres, further enhancing the bonding effect between the opal powder and the phase change microspheres. A layer of opal powder is covered on the surface of the phase change microspheres. On the one hand, the adsorption effect of the opal powder can adsorb odors, and on the other hand, it can improve the mechanical properties of the phase change microspheres.

[0009] S3, ultrasonically dispersing the phase-change microspheres coated with opal modified by silane coupling agent in water, and adding N-isopropylacrylamide, acrylamide and potassium persulfate, raising the temperature to 70-85°C under nitrogen atmosphere, stirring and reacting for 4-8h, washing by centrifugation with deionized water after the reaction, and obtaining the phase-change temperature-regulating microspheres modified with thermosensitive polymer surface after drying; Isopropyl acrylamide is a temperature-responsive polymer with a lower critical temperature of 32-33°C. After it is modified on the surface, the polymer chain can undergo a conformational transition from contraction to extension in response to changes in ambient temperature in an aqueous solution. When the temperature is above its lower critical temperature, the polymer chain will contract, and when the temperature is below its lower critical temperature, the polymer chain will stretch, thereby achieving a reversible temperature response. Therefore, in this step, N-isopropyl acrylamide and acrylamide copolymer are used as thermosensitive polymers to coat the silane coupling agent-modified opal-coated phase change microspheres to achieve surface temperature control. After exercise or in hot weather, the human body temperature will rise and a large amount of sweat will be secreted, which will inevitably emit an unpleasant sweat odor. When the temperature is higher than the lower critical temperature of the thermosensitive polymer, its polymer chain will contract, and the opal adsorbent coated on the surface of the phase change microspheres will be exposed, which is conducive to the adsorption of sweat odor or body odor.

[0010] S4. Add phase change temperature regulating microspheres modified with a thermosensitive polymer surface, ethylene-vinyl acetate copolymer and sodium carboxymethyl cellulose into water, stir evenly to obtain a phase change temperature regulating microsphere finishing solution, add polyester fibers thereto for impregnation, and after the impregnation is completed, take out and dry to obtain the phase change temperature regulating polyester fibers.

[0011] In this step, the phase change temperature regulating microspheres are mixed with the adhesive ethylene-vinyl acetate copolymer and the thickener sodium carboxymethyl cellulose to prepare a phase change temperature regulating microsphere finishing liquid, and the polyester fiber is impregnated. Due to the addition of the adhesive and the thickener, the phase change temperature regulating microspheres can be more firmly combined with the polyester fiber.

[0012] Furthermore, the preparation method of the antibacterial cotton fiber is specifically as follows: A1. Immerse the pretreated cotton fiber in a polyacrylic acid oligomer solution for 20-30 minutes, then raise the temperature to 160-180° C. and heat for 5-10 minutes, then wash and dry to obtain polyacrylic acid-coated cotton fiber; wherein the drying conditions are: drying at 75-85° C. for 1-3 hours; A2, immersing the cotton fiber coated with polyacrylic acid in a silver nitrate solution, stirring at 20-30°C for 10-20 minutes, and then drying, and then immersing in a NaBH4 solution again, stirring at 20-30°C for 10-20 minutes, washing, and drying to obtain the antibacterial cotton fiber; wherein the drying conditions are: drying at 75-85°C for 1-3 hours; Cotton fabric has good water absorption, air permeability, is therefore usually used in textile products, its structure is porous, so the surface is very easy to adsorb microorganisms, sweat stains, dander and stains that adhere to the cotton fabric surface on the human skin surface may provide nutrition to health errors, making microorganisms especially easy to breed and grow on the cotton fabric surface, may cause the human body to receive pathogen infection. Therefore in this step, first utilize polyacrylic acid oligomer and the hydroxyl generation esterification reaction on the cotton fiber surface, the cotton fiber surface is modified, then immersed in the silver nitrate solution, by the carboxyl on the polyacrylic acid oligomer and the coordination of silver ions can be firmly loaded on the cotton fiber surface with nano silver particles, thereby make the cotton fiber have good antimicrobial properties.

[0013] A method for preparing a covered yarn comprises the following steps: a core yarn is drawn out from the core of a hollow spindle, and a drafting treatment is performed, and then a first outer covering yarn is wrapped around the outside of the core yarn in an S-twist wrapping direction, and the twist is 800-1000 twists / m, and then a second outer covering yarn is wrapped around the outside of the first outer covering yarn in a Z-twist wrapping direction, and the twist is 60%-75% of the first wrapping twist, and the yarn is drawn out and rolled up after twisting to obtain the covered yarn. When the drafting treatment is performed, the drafting multiple is 3.4-3.8.

[0014] The present invention has the following beneficial effects: The present invention uses nylon stretch yarn as core yarn, phase change thermostatic polyester fiber as first outer covering yarn, and antibacterial cotton fiber as second outer covering yarn. The first outer covering yarn is covered on the outside of the core yarn in an S-twist covering direction, and then the second outer covering yarn is covered on the outside of the first outer covering yarn in a Z-twist covering direction, and then twisted and drawn out to obtain. In the preparation process of phase change thermostatic polyester fiber, n-octadecane and butyl stearate are used as phase change core materials; polymethyl methacrylate is used as wall material, phase change microspheres are prepared by suspension polymerization, and the surface is coated and modified by silane coupling agent, and further coated with thermosensitive polymer, which can store or release a large amount of heat when the temperature changes, and adjust the comfort of wearing; at the same time, it can absorb unpleasant odors after exercise or in hot weather. In the process of preparing antibacterial cotton fiber, polyacrylic acid oligomer is first used to undergo esterification reaction with the hydroxyl groups on the surface of cotton fiber, and then it is immersed in silver nitrate solution. Through the coordination effect of the carboxyl groups on the polyacrylic acid oligomer and the silver ions, the nanosilver particles can be firmly loaded on the surface of the cotton fiber, thus making the cotton fiber have good antibacterial properties. DETAILED DESCRIPTION

[0015] The following will be combined with the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0016] The n-octadecane (melting point 28.18°C, specification: 99%), butyl stearate (melting point 27°C, specification: chemically pure, 98%), and silane coupling agent (Lushi, ≥98.0%) used in the present invention were purchased from Sinopharm Chemical Reagent Company, methyl methacrylate (AR), pentaerythritol tetraacrylate (AR), azobisisobutyronitrile (AR), and sodium dodecyl sulfate (AR) were purchased from Shanghai MacLean Biochemical Technology Co., Ltd., opal powder (1250 mesh, provided by Heilongjiang Enterprise Shanghai, produced from Nenjiang opal shale), dispersant is sodium polyphosphate, N-isopropylacrylamide, acrylamide, Sodium sulfate was purchased from Sigma-Aldrich, USA, ethylene-vinyl acetate copolymer (P301637), sodium carboxymethyl cellulose (C104986), polyacrylic acid oligomer (50%), silver nitrate (99%), sodium borohydride (99%) were purchased from Shanghai Aladdin Biochemical Technology Co., Ltd., nylon stretch yarn (70D nylon stretch yarn) was purchased from Jiaxing Jinxu New Material Technology Co., Ltd., polyester stretch yarn (75D polyester stretch yarn) was purchased from Shaoxing Xineng Textile Technology Co., Ltd., cotton fiber was purchased from Dezhou Caishihe Textile Co., Ltd., and all raw materials and reagents were commercially available. The ball mill used in the present invention is an XQM-4 planetary ball mill.

[0017] Embodiment 1 A covered yarn, comprising a core yarn and an outer covered yarn, wherein the outer covered yarn comprises a first outer covered yarn and a second outer covered yarn; the core yarn is a nylon stretch yarn, the first outer covered yarn is a phase-change temperature-regulating polyester fiber, and the second outer covered yarn is an antibacterial cotton fiber; The preparation method of phase-change temperature-regulating polyester fiber comprises: using an organic low-temperature phase-change compound as a phase-change heat storage material and an acrylic polymer as a wall material, preparing phase-change microspheres by suspension polymerization, mixing with inorganic powder modified by a silane coupling agent, and then using a thermosensitive polymer to perform surface modification to obtain a phase-change temperature-regulating microsphere finishing liquid, coating the microspheres on polyester fibers, and obtaining phase-change temperature-regulating polyester fibers; The preparation method of the antibacterial cotton fiber comprises: modifying the cotton fiber with a water-soluble high molecular polymer binder and then introducing an inorganic antibacterial agent to obtain the antibacterial cotton fiber.

[0018] The preparation method of phase change temperature regulating polyester fiber is specifically as follows: S1. 12 parts by weight of n-octadecane, 8 parts by weight of butyl stearate, 25 parts by weight of methyl methacrylate, 4 parts by weight of crosslinking agent pentaerythritol tetraacrylate and 1 part by weight of initiator azobisisobutyronitrile are mixed evenly and ultrasonically dispersed for 15 minutes, and then 45 parts by weight of emulsifier sodium dodecyl sulfate solution are added thereto, the temperature is raised to 35°C, and the mixture is stirred and dispersed at a speed of 800 r / min for 15 minutes, and then the temperature is raised to 85°C, and the mixture is stirred at a speed of 600 r / min for 8 hours, separated by suction filtration, repeatedly washed with ethanol and deionized water for 3 times, and dried in an oven at 50°C for 24 hours to obtain phase change microspheres; wherein the preparation method of the sodium dodecyl sulfate solution is: dissolving sodium dodecyl sulfate in deionized water and mixing evenly to obtain the phase change microspheres; the amount of sodium dodecyl sulfate in deionized water is 0.05 g / mL; S2. Add 10 parts by weight of pretreated opal powder to 100 parts by weight of water, perform ultrasonic dispersion for 25 minutes to obtain a suspension, add 5 parts by weight of silane coupling agent KH550 solution thereto, raise the temperature to 40°C and stir for 7 hours, then add 15 parts by weight of phase change microspheres thereto, continue stirring for 4 hours and then centrifuge, and dry in an oven at 45°C for 4 hours to obtain phase change microspheres coated with silane coupling agent modified opal; wherein the pretreatment process of the opal powder is: The opal powder is placed in a ball mill, and water and a dispersant are added to perform ball milling; the ball-to-material mass ratio is 4:1, the ball mill revolution speed is 250 r / min, the grinding time is 3 h, and the mass ratio of the opal powder, water and the dispersant is 35:6.5:0.3; the preparation method of the silane coupling agent KH550 solution is: the silane coupling agent KH550 is dispersed in the aqueous solution, and the mixture is mixed evenly, and the amount of the silane coupling agent KH550 in the water is 0.05 g / mL; S3, dispersing 12 parts by weight of silane coupling agent modified opal coated phase change microspheres in 180 parts by weight of water by ultrasonic for 25 minutes, adding 15 parts by weight of N-isopropylacrylamide, 4 parts by weight of acrylamide and 0.8 parts by weight of potassium persulfate, raising the temperature to 80°C under nitrogen atmosphere, stirring and reacting for 6 hours, washing with deionized water by centrifugation 3 times after the reaction, and vacuum drying at 65°C for 18 hours to obtain phase change temperature regulating microspheres modified with thermosensitive polymer surface; S4. Add 35 parts by weight of phase change thermostatic microspheres modified with a thermosensitive polymer surface, 45 parts by weight of ethylene-vinyl acetate copolymer and 5 parts by weight of sodium carboxymethyl cellulose into 55 parts by weight of water, stir for 6 hours to mix evenly to obtain a phase change thermostatic microsphere finishing liquid, add 35 parts by weight of polyester fibers thereto for impregnation, take out after 6 hours of impregnation, and dry at 80°C for 30 minutes to obtain a phase change thermostatic polyester fiber.

[0019] Wherein, the preparation method of antibacterial cotton fiber is specifically as follows: A1. Immerse 10 parts by weight of pretreated cotton fibers in 100 parts by weight of polyacrylic acid oligomer solution (1wt%, pH=4) for 25 minutes, then raise the temperature to 170°C and heat for 8 minutes, then wash with deionized water for 3 times and place in an oven at 80°C to dry for 2 hours to obtain polyacrylic acid-coated cotton fibers; wherein the pretreatment process of the cotton fibers is as follows: place 10 parts by weight of untreated cotton fibers in 100 parts by weight of sodium dodecyl sulfate aqueous solution for 40 minutes, then wash with deionized water for 3 times, then ultrasonically wash with anhydrous ethanol for 40 minutes, then wash with deionized water for 3 times, and place in an oven at 75°C to dry for 2 hours, wherein the concentration of the sodium dodecyl sulfate aqueous solution is 2wt%; A2, immersing 15 parts by weight of cotton fiber coated with polyacrylic acid in 100 parts by weight of silver nitrate solution, stirring at 25°C for 15 min, drying at 80°C for 2 h, immersing again in 100 parts by weight of NaBH4 solution, stirring at 25°C for 15 min, washing 3 times with deionized water, and drying at 80°C for 2 h to obtain antibacterial cotton fiber; wherein the concentration of the silver nitrate solution is 0.47 mol / L, and the concentration of the NaBH4 solution is 0.94 mol / L; A method for preparing a covered yarn comprises the following steps: a core yarn nylon stretch yarn is drawn out from the core of a hollow spindle in a covering machine, and is drawn through a drawing device with a drawing multiple of 3.6, and then a first outer covering yarn is covered on the outside of the core yarn in an S-twist covering direction with a twist of 900 twists / m, and then a second outer covering yarn is covered on the outside of the first outer covering yarn in a Z-twist covering direction with a twist of 65% of the first covering twist, and the yarn is drawn out and wound after twisting to obtain the covered yarn.

[0020] Embodiment 2 Compared with the first embodiment, this embodiment has the following differences, and the rest is with reference to the first embodiment.

[0021] In the preparation method of phase change temperature regulating polyester fiber: In step S1, 10 parts by weight of n-octadecane, 6 parts by weight of butyl stearate, 22 parts by weight of methyl methacrylate, 2 parts by weight of crosslinking agent pentaerythritol tetraacrylate and 0.45 parts by weight of initiator azobisisobutyronitrile are uniformly mixed and ultrasonically dispersed for 10 minutes, and then 40 parts by weight of emulsifier sodium dodecyl sulfate solution is added thereto, the temperature is increased to 30° C., and after stirring and dispersing for 10 minutes, the temperature is increased to 80° C. and stirred for 8 hours; In step S2, 6.5 parts by weight of pretreated opal powder are added to 80 parts by weight of water, ultrasonically dispersed for 20 minutes to obtain a suspension, and then 3.5 parts by weight of silane coupling agent KH550 solution are added thereto, the temperature is raised to 30° C. and stirred for 6 hours, and then 12 parts by weight of phase change microspheres are added thereto, and the stirring is continued for 3 hours and then centrifuged; during the pretreatment of the opal powder, the ball-to-material mass ratio is 3:1, the ball mill revolution speed is 200 r / min, the grinding time is 2 hours, and the mass ratio of the opal powder, water and dispersant is 20:5:0.25; In step S3, 10 parts by weight of silane coupling agent modified opal-coated phase change microspheres are dispersed in 150 parts by weight of water by ultrasonic for 20 minutes, and 12 parts by weight of N-isopropylacrylamide, 2 parts by weight of acrylamide and 0.5 parts by weight of potassium persulfate are added, and the temperature is raised to 70° C. under a nitrogen atmosphere, and the mixture is stirred and reacted for 4 hours; In step S4, 30 parts by weight of phase change temperature regulating microspheres modified with a thermosensitive polymer surface, 38 parts by weight of ethylene-vinyl acetate copolymer and 2 parts by weight of sodium carboxymethyl cellulose are added to 50 parts by weight of water, and the mixture is stirred for 5 hours to obtain a phase change temperature regulating microsphere finishing liquid, to which 32 parts by weight of polyester fibers are added for impregnation.

[0022] In the preparation method of antibacterial cotton fiber: In step A1, 8 parts by weight of pretreated cotton fibers are immersed in 88 parts by weight of polyacrylic acid oligomer solution (1 wt%, pH=4) for 20 minutes, and then the temperature is raised to 160° C. and heated for 5 minutes. The fibers are then washed with deionized water for 3 times and dried in an oven at 75° C. for 1 hour to obtain polyacrylic acid-coated cotton fibers. In step A2, 12 parts by weight of cotton fiber coated with polyacrylic acid is immersed in 95 parts by weight of silver nitrate solution, stirred at 20°C for 10 minutes, dried at 75°C for 1 hour, immersed in 95 parts by weight of NaBH4 solution again, stirred at 20°C for 10 minutes, washed with deionized water 3 times, and dried at 75°C for 1 hour to obtain antibacterial cotton fiber; In the preparation method of the covered yarn, the traction multiple is 3.4, and then the first outer covering yarn is covered on the outside of the core yarn in an S-twist covering direction with a twist of 800 twists / m, and then the second outer covering yarn is covered on the outside of the first outer covering yarn in a Z-twist covering direction with a twist of 60% of the first covering twist.

[0023] Embodiment 3 Compared with the first embodiment, this embodiment has the following differences, and the rest is with reference to the first embodiment.

[0024] In the preparation method of phase change temperature regulating polyester fiber: In step S1, 15 parts by weight of n-octadecane, 10 parts by weight of butyl stearate, 28 parts by weight of methyl methacrylate, 6 parts by weight of crosslinking agent pentaerythritol tetraacrylate and 1.2 parts by weight of initiator azobisisobutyronitrile are uniformly mixed and ultrasonically dispersed for 20 minutes, and then 50 parts by weight of emulsifier sodium dodecyl sulfate solution is added thereto, the temperature is increased to 40° C., and the mixture is stirred and dispersed for 20 minutes, and then the temperature is increased to 90° C. and stirred for 10 hours; In step S2, 12 parts by weight of the pretreated opal powder are added to 120 parts by weight of water, ultrasonically dispersed for 30 minutes to obtain a suspension, and then 5.5 parts by weight of a silane coupling agent KH550 solution is added thereto, the temperature is raised to 45° C. and stirred for 8 hours, and then 18 parts by weight of phase change microspheres are added thereto, and the stirring is continued for 5 hours and then centrifuged; during the pretreatment of the opal powder, the ball-to-material mass ratio is 6:1, the ball mill revolution speed is 300 r / min, the grinding time is 5 hours, and the mass ratio of the opal powder, water and dispersant is 40:8:0.32; In step S3, 15 parts by weight of silane coupling agent modified opal-coated phase change microspheres are dispersed in 200 parts by weight of water by ultrasonic for 30 minutes, and 18 parts by weight of N-isopropylacrylamide, 6 parts by weight of acrylamide and 1 part by weight of potassium persulfate are added, and the temperature is raised to 85° C. and stirred for reaction for 8 hours under a nitrogen atmosphere; In step S4, 40 parts by weight of phase change temperature regulating microspheres modified with a thermosensitive polymer surface, 50 parts by weight of ethylene-vinyl acetate copolymer and 8 parts by weight of sodium carboxymethyl cellulose are added to 60 parts by weight of water, and the mixture is stirred for 8 hours to obtain a phase change temperature regulating microsphere finishing liquid, into which 40 parts by weight of polyester fibers are added for impregnation.

[0025] In the preparation method of antibacterial cotton fiber: In step A1, 12 parts by weight of pretreated cotton fibers are immersed in 120 parts by weight of polyacrylic acid oligomer solution (1 wt%, pH=4) for 30 minutes, and then the temperature is raised to 180° C. and heated for 10 minutes, and then washed with deionized water for 3 times and placed in an oven at 85° C. and dried for 3 hours to obtain polyacrylic acid-coated cotton fibers; In step A2, 18 parts by weight of cotton fiber coated with polyacrylic acid is immersed in 120 parts by weight of silver nitrate solution, stirred at 30°C for 20 minutes, dried at 85°C for 3 hours, immersed in 120 parts by weight of NaBH4 solution again, stirred at 30°C for 20 minutes, washed with deionized water 3 times, and dried at 85°C for 3 hours to obtain antibacterial cotton fiber; In the preparation method of the covered yarn, the traction multiple is 3.8, and then the first outer covering yarn is covered on the outside of the core yarn in an S-twist covering direction with a twist of 1000 twists / m, and then the second outer covering yarn is covered on the outside of the first outer covering yarn in a Z-twist covering direction with a twist of 75% of the first covering twist.

[0026] Comparative Example 1 Compared with Example 1, in the preparation process of the phase-change temperature-regulating polyester fiber, the phase-change microspheres are not coated with opal powder, and the rest are referred to Example 1, specifically: Wherein, the preparation method of phase change temperature regulating polyester fiber is: 12 parts by weight of phase-change microspheres were dispersed in 180 parts by weight of water by ultrasonic for 25 minutes, and 15 parts by weight of N-isopropylacrylamide, 4 parts by weight of acrylamide and 0.8 parts by weight of potassium persulfate were added, and the temperature was raised to 80°C under nitrogen atmosphere, and stirred for reaction for 6 hours. After the reaction, the microspheres were washed by centrifugation with deionized water for 3 times, and vacuum dried at 65°C for 18 hours to obtain phase-change temperature-regulating microspheres modified with thermosensitive polymer surfaces; Add 35 parts by weight of thermosensitive polymer surface modified phase change temperature regulating microspheres, 45 parts by weight of ethylene-vinyl acetate copolymer and 5 parts by weight of sodium carboxymethyl cellulose to 55 parts by weight of water, stir for 6 hours to mix evenly to obtain a phase change temperature regulating microsphere finishing liquid, add 35 parts by weight of polyester fibers thereto for impregnation, take out after 6 hours of impregnation, and dry at 80°C for 30 minutes to obtain a phase change temperature regulating polyester fiber.

[0027] The preparation method of the phase change microspheres refers to the preparation of the phase change microspheres in step S1 of the method for preparing phase change temperature-regulating polyester fibers in Example 1.

[0028] The preparation of the antibacterial cotton fiber and the coated yarn refers to the preparation process of the antibacterial cotton fiber and the coated yarn in Example 1.

[0029] Comparative Example 2 Compared with Example 1, in the preparation process of phase-change temperature-regulating polyester fiber, the phase-change microspheres coated with silane coupling agent-modified opal are not coated with temperature-sensitive polymer, and the rest are referred to Example 1, specifically: Among them, the preparation method of phase change polyester fiber is: add 35 parts by weight of silane coupling agent modified opal-coated phase change microspheres, 45 parts by weight of ethylene-vinyl acetate copolymer and 5 parts by weight of sodium carboxymethyl cellulose into 55 parts by weight of water, stir for 6 hours to mix evenly to obtain phase change microsphere finishing liquid, add 35 parts by weight of polyester fiber thereto for impregnation, take out after impregnation for 6 hours, and dry at 80°C for 30 minutes to obtain phase change polyester fiber; wherein the silane coupling agent modified opal-coated phase change microspheres are prepared by referring to the silane coupling agent modified opal-coated phase change microspheres in Example 1.

[0030] The preparation of the antibacterial cotton fiber and the coated yarn refers to the preparation process of the antibacterial cotton fiber and the coated yarn in Example 1.

[0031] Comparative Example 3 Compared with Example 1, this comparative example does not modify the cotton fiber with polyacrylic acid oligomer during the preparation of the antibacterial cotton fiber, and the rest is as described in Example 1, specifically: The preparation method of the antibacterial cotton fiber is as follows: immerse 15 parts by weight of pretreated cotton fiber in 100 parts by weight of silver nitrate solution, stir at 25°C for 15 minutes, and then dry at 80°C for 2 hours, and then immerse in 100 parts by weight of NaBH4 solution again, stir at 25°C for 15 minutes, wash with deionized water 3 times, and dry at 80°C for 2 hours to obtain the antibacterial cotton fiber; wherein the concentration of the silver nitrate solution is 0.47 mol / L, and the concentration of the NaBH4 solution is 0.94 mol / L.

[0032] The preparation of the phase-change temperature-regulating polyester fiber and the coated yarn refers to the preparation process of the phase-change temperature-regulating polyester fiber and the coated yarn in Example 1.

[0033] Comparative Example 4 Compared with Example 1, in this comparative example, the cotton fiber is not subjected to antibacterial treatment, and the pretreated cotton fiber is directly used as the second outer covering yarn. The rest of the process is referred to Example 1.

[0034] Related tests: Breaking strength: According to GB / T3916-2013 “Textiles, packaged yarn, single yarn - Determination of breaking strength and breaking elongation (CRE method)”, the breaking strength of Examples 1 to 3 and Comparative Examples 1 to 4 was tested using a yarn strength and elongation meter.

[0035] Elongation at break: According to GB / T3916-2013 “Determination of breaking strength and elongation at break of textiles, packaged yarns and single yarns (CRE method)”, the elongation at break of Examples 1 to 3 and Comparative Examples 1 to 4 was tested using a yarn strength and elongation meter. The test results are shown in Table 1.

[0036] Table 1 Test results of breaking strength and breaking elongation It can be seen from the above test data that the overall mechanical properties of Examples 1 to 3 are better than those of Comparative Examples 1 to 4, and in particular, Example 1 has the best comprehensive mechanical properties.

[0037] Deodorization performance test: The coated yarns prepared in each embodiment and comparative example were woven into socks or underwear, and their deodorization performance was evaluated. The samples were cut into small pieces of 10 cm × 10 cm, and the initial concentrations of ammonia and acetic acid in the enclosed space and the concentrations of ammonia and acetic acid 2 hours after the deodorization sample was added were measured by a detection tube. The deodorization performance test was carried out according to the standard "GB / T 33610.1-2019 Determination of deodorization performance of textiles Part 1: General rules" and the standard "GB / T 33610.2-2017 Determination of deodorization performance of textiles Part 2: Detection tube method", and the test results are shown in Table 2.

[0038] Table 2 Deodorization performance test results It can be seen from the above deodorization performance test results that the deodorization performance of Examples 1 to 3 is better than that of Comparative Examples 1 to 4 as a whole, among which Example 1 has the best deodorization performance; before washing with water, Comparative Examples 2 to 4 are not much different from Examples 1 to 3, but the deodorization performance of Comparative Example 1 (opal powder is not coated during the preparation process) is the worst, because opal powder as an adsorption material can effectively adsorb ammonia and acetic acid and effectively eliminate odor; but after washing with water 50 times, the ammonia elimination rate and acetic acid elimination rate of Comparative Example 2 (the silane coupling agent modified opal coated phase change microspheres are not coated with thermosensitive polymers during the preparation process) are significantly reduced, because the coating of the modified opal coated phase change microspheres with thermosensitive polymers can enhance the binding effect between the opal powder and the fiber to a certain extent.

[0039] Antibacterial property test: The coated yarn prepared in each embodiment and comparative example was woven into socks or underwear, and the antibacterial properties were evaluated. The fabric sample and the control sample were cut into pieces of 5 mm × 5 mm in size, and 0.75 g ± 0.05 g was weighed as a sample. The antibacterial property test was carried out according to the standard "T / SZTI A 001-2020 Antibacterial Fibers and Textiles". The test results are shown in Table 3.

[0040] Table 3 Antibacterial performance test results It can be seen from the above antibacterial performance test results that the antibacterial performance of Examples 1 to 3 is better than that of Comparative Examples 1 to 4 as a whole, among which Example 1 has the best antibacterial performance; before washing, Comparative Examples 1 to 3 are not much different from Examples 1 to 3, but the antibacterial performance of Comparative Example 4 (no antibacterial treatment of cotton fiber) is the worst, because nanosilver particles are not loaded on the surface of cotton fiber, and no antibacterial effect can be achieved; but after washing 50 times, the antibacterial performance of Comparative Example 3 (no polyacrylic acid oligomer modification of cotton fiber) is significantly reduced, because the cotton fiber surface is not modified by polyacrylic acid coating, the binding force between the nanosilver particles and the cotton fiber surface is small, and its antibacterial performance is reduced after washing.

[0041] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0042] Although the embodiments of the present application have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A covered yarn, characterized in that: It comprises a core yarn and an outer covering yarn, wherein the outer covering yarn comprises a first outer covering yarn and a second outer covering yarn; the core yarn is a nylon stretch yarn, the first outer covering yarn is a phase-change temperature-regulating polyester fiber, and the second outer covering yarn is an antibacterial cotton fiber; The preparation method of the phase-change temperature-regulating polyester fiber comprises: using an organic low-temperature phase-change compound as a phase-change heat storage material and an acrylic polymer as a wall material, preparing phase-change microspheres by suspension polymerization, mixing with an inorganic powder modified by a silane coupling agent, and then performing surface modification with a thermosensitive polymer to obtain a phase-change temperature-regulating microsphere finishing liquid, coating the microspheres on polyester fibers, and obtaining the phase-change temperature-regulating polyester fibers; The preparation method of the antibacterial cotton fiber comprises: modifying the cotton fiber with a water-soluble high molecular polymer binder and then introducing an inorganic antibacterial agent to obtain the antibacterial cotton fiber.

2. The covered yarn according to claim 1, characterized in that The preparation method of the phase change temperature regulating polyester fiber is specifically as follows: S1. Mix n-octadecane, butyl stearate, methyl methacrylate, a crosslinking agent and an initiator uniformly, and then ultrasonically disperse them for 10-20 minutes. Then add an emulsifier solution, raise the temperature to 30-40° C., stir and disperse for 10-20 minutes, then raise the temperature to 80-90° C. and stir for 6-10 hours. After separation by suction filtration, washing and drying, phase change microspheres are obtained. S2, adding the pretreated opal powder to water, ultrasonically dispersing to obtain a suspension, adding a silane coupling agent solution thereto, raising the temperature to 30-45°C and stirring for 6-8h, adding phase change microspheres thereto, continuing stirring for 3-5h and centrifuging, and drying to obtain phase change microspheres coated with silane coupling agent modified opal; S3, ultrasonically dispersing the phase-change microspheres coated with opal modified by silane coupling agent in water, and adding N-isopropylacrylamide, acrylamide and potassium persulfate, raising the temperature to 70-85°C under nitrogen atmosphere, stirring and reacting for 4-8h, washing by centrifugation with deionized water after the reaction, and obtaining the phase-change temperature-regulating microspheres modified with thermosensitive polymer surface after drying; S4. Add phase change temperature regulating microspheres modified with a thermosensitive polymer surface, ethylene-vinyl acetate copolymer and sodium carboxymethyl cellulose into water, stir evenly to obtain a phase change temperature regulating microsphere finishing solution, add polyester fibers thereto for impregnation, and after the impregnation is completed, take out and dry to obtain the phase change temperature regulating polyester fibers.

3. The covered yarn according to claim 2, characterized in that The pretreatment process of opal powder is as follows: placing the opal powder in a ball mill, adding water and a dispersant, and then ball milling; the ball-to-material mass ratio is 3-6:1, the ball mill revolution speed is 200-300r / min, and the grinding time is 2-5h.

4. The covered yarn according to claim 2, characterized in that The crosslinking agent is pentaerythritol tetraacrylate or ethylene glycol dimethacrylate, the initiator is any one of azobisisobutyronitrile, azobisisoheptanenitrile, dimethyl azobisisobutyrate, azobisisobutyramidine hydrochloride, azobisisobutylimidazoline hydrochloride or a mixture of several thereof, and the emulsifier is any one of sodium lauryl sulfate, monoglyceride of laurate, glyceryl stearate, and cetyl palmitate or a mixture of several thereof.

5. The covered yarn according to claim 1, characterized in that The preparation method of the antibacterial cotton fiber is specifically as follows: A1. Immersing the pretreated cotton fiber in a polyacrylic acid oligomer solution for 20-30 minutes, raising the temperature to 160-180° C. and heating for 5-10 minutes, and then washing and drying to obtain polyacrylic acid-coated cotton fiber; A2. Immerse the polyacrylic acid-coated cotton fiber in a silver nitrate solution, stir for 10-20 min at 20-30° C., and then dry, immerse in a NaBH4 solution again, stir for 10-20 min at 20-30° C., wash, and dry to obtain the antibacterial cotton fiber.

6. The covered yarn according to claim 5, characterized in that In steps A1 and A2, the drying conditions are: drying at 75-85° C. for 1-3 h.

7. The method for preparing the covered yarn according to any one of claims 1 to 6, characterized in that: The method comprises the following steps: the core yarn is led out from the core of the hollow spindle, and is subjected to a drafting treatment; then, a first outer covering yarn is covered on the outside of the core yarn in an S-twist covering direction, and the twist is 800-1000 twists / m; then, a second outer covering yarn is covered on the outside of the first outer covering yarn in a Z-twist covering direction, and the twist is 60%-75% of the first covering twist; and after twisting, the yarn is led out and wound up to obtain the covered yarn.

8. The method for preparing the covered yarn according to claim 7, characterized in that: When the drafting process is performed, the drafting multiple is 3.4-3.8.

Images