A kind of aromatic antibacterial composite yarn and its preparation method and application

Abstract

The present invention discloses a method for preparing an aromatic antibacterial composite yarn, comprising the following steps: preparing hollow fibers, and injecting nanocapsules containing fragrance into the hollow fibers during the preparation process; utilizing the temperature of the hollow fibers spun by melt spinning to melt the nanocapsules and disperse them into the hollow fibers' cavities and micropores; and obtaining an aromatic fiber filament bundle after cooling; and blending the aromatic fiber filament bundle with an antibacterial fiber filament bundle to obtain the aromatic antibacterial composite yarn. The preparation method of the present invention has a longer fragrance retention and greater stability than conventional blended hollow fibers because the jasmine fragrance nanocapsules are injected into the hollow fibers. Due to the high spinneret temperature and the high temperature of the newly spun hollow fibers, the jasmine fragrance nanocapsules melt, with some of the jasmine fragrance being dispersed in the spandex micropores, thereby enhancing the fragrance emitted by the jasmine fragrance. After the temperature of the hollow fibers drops, the jasmine fragrance nanocapsules resolidify and stabilize.

Description

Technical Field

[0001] The present invention relates to the technical field of textiles, and in particular to a method for preparing an aromatic antibacterial composite yarn, the aromatic antibacterial composite yarn prepared by the preparation method, and application of the aromatic antibacterial composite yarn in textiles such as fabrics. Background Art

[0002] In recent years, the market for scented products has become increasingly popular, showing strong growth potential. This includes products such as scented clothing, accessories, and bed linens. New scented fibers offer high added value, and the promotion of their technology and widespread adoption will generate significant economic and social benefits. Currently, four common methods for producing scented fibers exist: blending, composite spinning, adsorption, and microencapsulated fragrance post-treatment. The microencapsulated fragrance post-treatment method offers simplicity and low production costs; the composite spinning method requires complex spinning equipment and high production costs; the blending method is relatively easy to implement, but requires the fragrance to have a high boiling point; and the adsorption method, due to its long production cycle, is only suitable for certain specialty synthetic fibers.

[0003] Currently, many aromatic and antibacterial fibers have been developed. For example, Chinese patent application CN104178844A discloses an aromatic nylon-spandex air-coated yarn and its production method. The yarn is prepared by mixing a high-temperature-resistant fragrance microcapsule masterbatch with nylon 6 chips in a reasonable ratio, and then spun with spandex to produce the nylon-spandex air-coated yarn. However, the yarn suffers from insufficient fragrance persistence. Chinese patent application CN110616495A discloses an aromatic jacquard home textile fabric and its production method. The fabric is woven from warp and weft yarns, each comprising an inner core and an outer core. The warp inner core is chitosan fiber, the warp outer core is alginate / PBT copolymer fiber, the weft inner core is a graphene-containing synthetic fiber, and the weft outer core is Tencel fiber. The outer core is spirally wound around the inner core to form a plurality of closely connected loops. Aromatic microcapsules are bonded to the outer wall of the inner core and between adjacent loops. However, the antibacterial effect is unsatisfactory and the fragrance persistence is poor. Chinese patent application CN103668548A discloses luka fibers and functional fibers made therefrom. The base fiber-forming polymer is a fiber-forming polymer that can be produced through a melt spinning process using a heterogeneous hollow spinneret. The functional fibers are characterized by being made from luka fibers after further finishing, including aromatic luka fibers, antibacterial luka fibers, anti-mite luka fibers, mosquito repellent luka fibers, negative ion luka fibers, moisture-wicking luka fibers, and cooling luka fibers. However, the aromatic microcapsule finishing agent and the antibacterial finishing agent are applied through the impregnation method, which clearly results in insufficient fragrance durability and poor antibacterial properties. Summary of the Invention

[0004] In view of this, in order to overcome the defects of the prior art, the purpose of the present invention is to provide a method for preparing a composite yarn that has both aromatic and antibacterial functions, and can maintain the direction and antibacterial properties more permanently and effectively.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A method for preparing an aromatic antibacterial composite yarn comprises the following steps:

[0007] Preparation of hollow fibers, and during the preparation of the hollow fibers, injection of nanocapsules containing fragrance into the cavity of the hollow fibers, melting the nanocapsules and dispersing them into the cavity and micropores of the hollow fibers using the temperature of the hollow fibers spun by melt spinning, and obtaining fragrance fiber filament bundles after cooling;

[0008] The aromatic fiber filament bundle and the antibacterial fiber filament bundle are blended to obtain the aromatic antibacterial composite yarn.

[0009] The aromatic hollow fiber is a composite material of jasmine essence nanocapsules and spandex. The jasmine essence nanocapsules are infused into the hollow fiber, ensuring a longer-lasting and more stable fragrance. The melt-spinning temperature of the hollow fiber melts the jasmine essence nanocapsules and partially disperses them into the micropores of the hollow fiber, enhancing the jasmine fragrance.

[0010] According to some preferred embodiments of the present invention, the antibacterial fiber filament bundle is prepared by melt spinning antibacterial masterbatch and nylon 6; the mass fraction of the antibacterial masterbatch in the raw materials of the antibacterial fiber filament bundle is 1-5%.

[0011] According to some preferred embodiments of the present invention, the raw materials for the antibacterial masterbatch are nano-ZnO, nylon 6, and a dispersant. The mass fraction of the dispersant in the raw materials for the antibacterial masterbatch is 0.5-1.5%, and the mass fraction of the nano-ZnO is 3-10%. In the aromatic antibacterial composite yarn, the antibacterial masterbatch is obtained by melt spinning ZnO / nylon 6. The purpose is to enhance the overall mechanical properties of the nylon 6 yarn. The addition of ZnO accelerates the decomposition of nylon 6 and acts as a heterogeneous nucleation agent, enhancing the entanglement between molecular chains and improving mechanical properties. Furthermore, the ZnO itself can achieve an antibacterial effect superior to that of micron-level materials.

[0012] According to some preferred embodiments of the present invention, the prepared antibacterial masterbatch is placed in a vacuum oven for drying at a temperature of 95-110° C. for 6-10 hours.

[0013] According to some preferred embodiments of the present invention, the hollow fiber is spandex; and the mass fraction of the nanocapsules in the aromatic fiber filament bundle is 20-40%.

[0014] According to some preferred embodiments of the present invention, the core material of the nanocapsule is jasmine essence, the wall material is n-butyl methacrylate, the emulsifier is polyoxyethylene stearyl ether, and the initiator is azobisisobutylamidine hydrochloride.

[0015] According to some preferred embodiments of the present invention, the nanocapsules are prepared by the following steps: uniformly mixing jasmine essence and n-butyl methacrylate to obtain an oil phase; adding azobisisobutylamidine hydrochloride to water to form an initiator solution; dissolving polyoxyethylene stearyl ether in the initiator solution to form an aqueous phase; mixing the aqueous phase and the oil phase to prepare an emulsion; and stirring at 70-90° C. to obtain the nanocapsules.

[0016] According to some preferred embodiments of the present invention, the aromatic fiber filament bundle and the antibacterial fiber filament bundle are both prepared by melt spinning, and the process parameters of the melt spinning are as follows: a spinning temperature of 180~260°C, a spinning speed of 700~1000m / min, a melt pressure of 8.0~15.0MPa, a side blowing temperature of 5~10°C, and a stretching ratio of 2~3.

[0017] According to some preferred embodiments of the present invention, the fragrance persistence of the prepared aromatic antibacterial composite yarn is 1098~1236d, the antibacterial rate of the aromatic antibacterial composite yarn against Candida albicans is 91.2~94.5%, the antibacterial rate of the aromatic antibacterial composite yarn against Escherichia coli is 92.3~95.6%, and the antibacterial rate of the aromatic antibacterial composite yarn against Staphylococcus aureus is 97.7~99.5%.

[0018] According to some preferred embodiments of the present invention, the prepared aromatic antibacterial composite yarn has a breaking strength of 0.7-0.9 cN / dtex and an elongation at break of 450-600%.

[0019] The present invention provides an aromatic antibacterial composite yarn prepared by the above-mentioned preparation method.

[0020] The present invention provides an application of the aromatic antibacterial composite yarn prepared by the above-mentioned preparation method in textiles such as fabrics.

[0021] Due to the adoption of the above technical solutions, compared with the prior art, the benefits of the present invention are as follows: in the preparation method of the aromatic antibacterial composite yarn of the present invention, the aromatic hollow fiber is a jasmine essence nanocapsule / spandex composite material, and the jasmine essence nanocapsule has a longer fragrance retention time and stability. Since the jasmine essence nanocapsule is injected into the hollow of the hollow fiber, it has a longer fragrance retention time and stability than the conventional mixed hollow fiber; in addition, the jasmine essence nanocapsule is injected into the hollow fiber from the spinneret, the temperature of the spinneret is high and the temperature of the newly spun hollow fiber is high, the jasmine essence nanocapsule melts and part of the jasmine essence is dispersed in the spandex micropores, making the fragrance emitted by the jasmine essence stronger; after the temperature of the hollow fiber drops, the jasmine essence nanocapsule is re-solidified and stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0023] Figure 1 Schematic diagram of the preparation process of the aromatic antibacterial composite yarn in a preferred embodiment of the present invention;

[0024] Figure 2 Schematic diagram of the structure of the spinneret holes in the spinneret in the preferred embodiment of the present invention;

[0025] Figure 3 Schematic diagram of the structure of the injection assembly for injecting essence nanocapsules into the spinneret in a preferred embodiment of the present invention;

[0026] Figure 4 Schematic cross-sectional view of an aromatic hollow fiber in a preferred embodiment of the present invention;

[0027] In the accompanying drawings, 201-screw extruder, 202-metering pump, 203-spinning mechanism, 2031-spinneret, 2032-spinneret hole, 2033-injection rod, 2034-injection pipe, 204-side wind device, 205-spinneret, 206-cooling device, 207-twister, 501-spandex fiber, 502-flavor nanocapsule. DETAILED DESCRIPTION

[0028] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0029] The principle of the present invention is as follows: the antibacterial masterbatch in the present invention is a nano-ZnO / nylon 6 composite material. Nano-ZnO is an inorganic nano-antibacterial agent. Because its carrier is nano-sized, the specific surface area is increased, and it can better adsorb microorganisms, thereby achieving an antibacterial effect better than that of the micron level; at the same time, the addition of nano-ZnO can accelerate the decomposition of nylon 6 and play a heterogeneous nucleation role, thereby enhancing the entanglement between molecular chains and improving mechanical properties. The aromatic hollow fiber is a jasmine essence nanocapsule / spandex composite material. The jasmine essence nanocapsule has a longer lasting fragrance time and stability. Since the jasmine essence nanocapsule is injected into the hollow of the hollow fiber, it has a longer lasting fragrance time and stability than conventional mixed hollow fibers. In addition, the jasmine essence nanocapsule is injected into the hollow fiber from the spinneret. The temperature of the spinneret and the temperature of the newly spun hollow fiber are high. The jasmine essence nanocapsule melts and some of the jasmine essence is dispersed in the spandex micropores, making the fragrance of the jasmine essence stronger. After the temperature of the hollow fiber drops, the jasmine essence nanocapsule re-solidifies and stabilizes.

[0030] Example 1

[0031] The preparation method of the aromatic antibacterial composite yarn in this embodiment specifically includes the following steps:

[0032] Step 1: Preparation of antibacterial masterbatch

[0033] Nano-ZnO, nylon 6 chips, and a dispersant were mixed in a mass ratio of 5:95:0.05 and fed into a pelletizer. The mixture was melt-extruded and pelletized into antibacterial masterbatch through a screw. The resulting antibacterial masterbatch was dried in a vacuum oven at 102°C for 8 hours and then stored for future use. The pelletizer's melt temperatures were 250°C in die zone 1, 245°C in barrel zone 1, 248°C in barrel zone 2, and 248°C in barrel zone 3.

[0034] Step 2: Preparation of antibacterial nylon (antibacterial fiber filament bundle)

[0035] Based on the mass fraction of the antibacterial masterbatch in the antibacterial nylon being 5%, the antibacterial masterbatch and nylon 6 chips are respectively sent to the screw extruder 201 after being measured, and mixed and extruded after being fully melted. The melt enters the spinning assembly after passing through the metering pump 202, and is ejected through the spinneret 205 to form a filament bundle, which is cooled by the side wind device 204 to finally obtain the antibacterial nylon.

[0036] The process parameters of melt spinning are: spinning temperature 260°C, spinning speed 800 m / min, melt pressure 9.0 MPa, side blowing temperature 5°C, and stretch ratio 2.

[0037] Step 3: Preparation of flavor nanocapsules

[0038] The core material, jasmine essence, and the wall material, n-butyl methacrylate, were uniformly mixed to form an oil phase. An appropriate amount of azobisisobutylamidine hydrochloride was added to water to form an initiator solution. Polyoxyethylene stearyl ether emulsifier was dissolved in the initiator solution to form an aqueous phase. The aqueous and oil phases were mixed to prepare an oil-in-water emulsion, which was then stirred at 80°C and 1000 rpm for 4 hours to produce the essence nanocapsules.

[0039] Step 4: Prepare aromatic fiber filament bundles

[0040] Using a melt spinning method, PU masterbatch was fed into a screw extruder 201 to produce a completely molten polymer. The polymer melt was continuously transported by a metering pump 202 and spun through a modified spinneret 203. Simultaneously, the fragrance nanocapsules prepared in step 3 were continuously injected into the modified spinneret, with the mass fraction of jasmine fragrance nanocapsules in the aromatic hollow PU fibers reaching 35%. The fragrance nanocapsules were solidified by a cooling device 206 to produce aromatic hollow PU fibers.

[0041] The process parameters of melt spinning are: spinning temperature 260°C, spinning speed 800 m / min, melt pressure 11.0 MPa, side blowing temperature 10°C, and stretch ratio 2.

[0042] like Figure 1-3 As shown, the modified spinning mechanism 203 in this embodiment includes a spinneret 2031 and an injection assembly. The spinneret 2031 is provided with one or more spinneret holes 2032. The injection assembly includes an injection pipe 2034 and an injection rod 2033. The injection rod 2033 is provided corresponding to the spinneret holes 2032. The cross section of the injection rod 2033 is circular and is provided concentrically with the spinneret holes 2032. The upper and lower ends of the injection rod 2033 are both arc-shaped, with the upper end sealed and the lower end open, so that the fragrance nanocapsules are injected into the fibers while the spinning solution passes through the spinning holes 2032 to form hollow fibers. Under the temperature of the spinneret 2031 and the hollow fibers, the fragrance nanocapsules melt and disperse and fill, and then cool and re-solidify, as shown in FIG. Figure 4 shown.

[0043] Step 5: Preparation of aromatic antibacterial composite yarn

[0044] The antibacterial nylon prepared in step (2) and the aromatic hollow PU fiber prepared in step (4) are twisted and compounded by a twister 207 to prepare an aromatic antibacterial composite yarn.

[0045] The prepared aromatic antibacterial composite yarn has a durability of 1236 days; the antibacterial rate against Candida albicans is 94.5%, the antibacterial rate against Escherichia coli is 95.6%, and the antibacterial rate against Staphylococcus aureus is 99.5%; the breaking strength is 0.85 cN / dtex, and the elongation at break is 550%.

[0046] Example 2

[0047] The preparation method of the aromatic antibacterial composite yarn in this embodiment specifically includes the following steps:

[0048] Step 1: Preparation of antibacterial masterbatch

[0049] Nano-ZnO, nylon 6 chips, and a dispersant were mixed in a mass ratio of 3:97:0.10 and fed into a pelletizer. The mixture was melt-extruded and pelletized into antibacterial masterbatch. The melt temperature was 250°C in die zone 1, 245°C in barrel zone 1, 248°C in barrel zone 2, and 248°C in barrel zone 3. The resulting antibacterial masterbatch was dried in a vacuum oven at 105°C for 9 hours before being stored for future use.

[0050] Step 2: Preparation of antibacterial nylon (antibacterial fiber filament bundle)

[0051] The antibacterial masterbatch and nylon 6 chips are respectively sent to the screw extruder 201 after being measured, and mixed and extruded after being fully melted. The melt enters the spinning assembly after passing through the metering pump 202, and is ejected through the spinneret 205 to form a tow, which is cooled by the side wind device 204 to finally obtain antibacterial nylon.

[0052] The mass fraction of antibacterial masterbatch is 10%, and the process parameters of melt spinning are: spinning temperature 260℃, spinning speed 900 m / min, melt pressure 11.0 MPa, side blowing temperature 5℃, and stretch ratio 3.

[0053] Step 3: Preparation of flavor nanocapsules

[0054] The core material, jasmine essence, and the wall material, n-butyl methacrylate, were uniformly mixed to form an oil phase. An appropriate amount of azobisisobutylamidine hydrochloride was added to water to form an initiator solution. Polyoxyethylene stearyl ether emulsifier was dissolved in the initiator solution to form an aqueous phase. The aqueous and oil phases were mixed to prepare an oil-in-water emulsion, which was then stirred at 80°C and 1000 rpm for 4 hours to produce the essence nanocapsules.

[0055] Step 4: Prepare aromatic fiber filament bundles

[0056] Using a melt spinning method, PU masterbatch was fed into a screw extruder 201 to produce a completely molten polymer. The polymer melt was continuously transported by a metering pump 202 and spun through a modified spinneret 203. Simultaneously, the fragrance nanocapsules prepared in step 3 were continuously injected into the modified spinneret, with the mass fraction of jasmine fragrance nanocapsules in the aromatic hollow PU fibers reaching 30%. The fragrance nanocapsules were solidified by a cooling device 206 to produce aromatic hollow PU fibers.

[0057] The process parameters of melt spinning are: spinning temperature 260°C, spinning speed 900 m / min, melt pressure 13.0 MPa, side blowing temperature 10°C, and stretch ratio 3.

[0058] Step 5: Preparation of aromatic antibacterial composite yarn

[0059] The antibacterial nylon prepared in step (2) and the aromatic hollow PU fiber prepared in step (4) are twisted and compounded by a twister 207 to prepare an aromatic antibacterial composite yarn.

[0060] The prepared aromatic antibacterial composite yarn has a durability of 1124 days; the antibacterial rate against Candida albicans is 93.1%, the antibacterial rate against Escherichia coli is 94.1%, and the antibacterial rate against Staphylococcus aureus is 98.2%; the breaking strength is 0.74 cN / dtex, and the elongation at break is 485%.

[0061] Example 3

[0062] The preparation method of the aromatic antibacterial composite yarn in this embodiment specifically includes the following steps:

[0063] Step 1: Preparation of antibacterial masterbatch

[0064] Nano-ZnO, nylon 6 chips, and a dispersant were mixed in a mass ratio of 10:90:0.15 and fed into a pelletizer. The mixture was melt-extruded and pelletized into antibacterial masterbatch. The melt temperature was 250°C in die zone 1, 245°C in barrel zone 1, 248°C in barrel zone 2, and 248°C in barrel zone 3. The resulting antibacterial masterbatch was dried in a vacuum oven at 110°C for 10 hours before being stored for future use.

[0065] Step 2: Preparation of antibacterial nylon (antibacterial fiber filament bundle)

[0066] The antibacterial masterbatch and nylon 6 chips are respectively sent to the screw extruder 201 after being measured, and mixed and extruded after being fully melted. The melt enters the spinning assembly after passing through the metering pump 202, and is ejected through the spinneret 205 to form a tow, which is cooled by the side wind device 204 to finally obtain antibacterial nylon.

[0067] The mass fraction of antibacterial masterbatch is 15%, and the process parameters of melt spinning are: spinning temperature 260℃, spinning speed 1000 m / min, melt pressure 15.0 MPa, side blowing temperature 5℃, and stretch ratio 3.

[0068] Step 3: Preparation of flavor nanocapsules

[0069] The core material, jasmine essence, and the wall material, n-butyl methacrylate, were uniformly mixed to form an oil phase. An appropriate amount of azobisisobutylamidine hydrochloride was added to water to form an initiator solution. Polyoxyethylene stearyl ether emulsifier was dissolved in the initiator solution to form an aqueous phase. The aqueous and oil phases were mixed to prepare an oil-in-water emulsion, which was then stirred at 80°C and 1000 rpm for 4 hours to produce the essence nanocapsules.

[0070] Step 4: Prepare aromatic fiber filament bundles

[0071] Using a melt spinning method, PU masterbatch was fed into a screw extruder 201 to produce a completely molten polymer. The polymer melt was continuously transported by a metering pump 202 and spun through a modified spinneret 203. Simultaneously, the fragrance nanocapsules prepared in step 3 were continuously injected into the modified spinneret, with the mass fraction of jasmine fragrance nanocapsules in the aromatic hollow PU fibers reaching 40%. The fragrance nanocapsules were solidified by a cooling device 206 to produce aromatic hollow PU fibers.

[0072] The process parameters of melt spinning are: spinning temperature 260°C, spinning speed 1000 m / min, melt pressure 15.0 MPa, side blowing temperature 10°C, and stretch ratio 3.

[0073] Step 5: Preparation of aromatic antibacterial composite yarn

[0074] The antibacterial nylon prepared in step (2) and the aromatic hollow PU fiber prepared in step (4) are twisted and compounded by a twister 207 to prepare an aromatic antibacterial composite yarn.

[0075] The prepared aromatic antibacterial composite yarn has a durability of 1098 days; the antibacterial rate against Candida albicans is 93.5%, the antibacterial rate against Escherichia coli is 94.7%, and the antibacterial rate against Staphylococcus aureus is 98.4%; the breaking strength is 0.78 cN / dtex, and the elongation at break is 498%.

[0076] Comparative Example 1

[0077] The method for preparing the aromatic antibacterial composite yarn in this comparative example differs from that in Example 1 in that, in step (4) of preparing the aromatic fiber filament bundle in this comparative example, the fragrance nanocapsules and PU masterbatch are fed into a screw extruder 201 and spun through a spinneret to produce the aromatic PU fibers. The remaining steps and parameters are essentially the same as those in Example 1. That is, the aromatic fiber filament bundle in this comparative example is not a hollow fiber, and the fragrance nanocapsules are not filled in the hollow fiber cavity. Instead, they are directly mixed with the PU masterbatch, melted, and then spun.

[0078] The prepared aromatic antibacterial composite yarn has a durability of 226 days; the antibacterial rate against Candida albicans is 94.4%, the antibacterial rate against Escherichia coli is 95.5%, and the antibacterial rate against Staphylococcus aureus is 99.5%; the breaking strength is 0.79 cN / dtex, and the elongation at break is 390%.

[0079] Comparative Example 2

[0080] The method for preparing the aromatic antibacterial composite yarn in this comparative example differs from that in Example 1 in that, in steps (3) and (4) of this comparative example, the prepared spandex is immersed in a fragrance nanocapsule solution and finally twisted and dried. The remaining steps and parameters are essentially the same as those in Example 1.

[0081] The prepared aromatic antibacterial composite yarn has a durability of 125 days; the antibacterial rate against Candida albicans is 93.8%, the antibacterial rate against Escherichia coli is 94.8%, and the antibacterial rate against Staphylococcus aureus is 98.1%; the breaking strength is 0.72 cN / dtex, and the elongation at break is 375%.

[0082] Comparative Example 3

[0083] The difference between the preparation method of the aromatic antibacterial composite yarn in this comparative example and that in Example 3 is that the content of nano-ZnO in the antibacterial masterbatch in this comparative example is 15%. The remaining steps and parameters are basically the same as those in Example 1.

[0084] The prepared aromatic antibacterial composite yarn has a durability of 1098 days; the antibacterial rate against Candida albicans is 93.2%, the antibacterial rate against Escherichia coli is 94.4%, and the antibacterial rate against Staphylococcus aureus is 98.2%; the breaking strength is 0.71 cN / dtex, and the elongation at break is 433%.

[0085] Comparative Example 4

[0086] The preparation method of the aromatic antibacterial composite yarn in this comparative example differs from that in Example 3 in that the mass fraction of the jasmine essence nanocapsules in the aromatic hollow PU fiber in this comparative example is 45%. The remaining steps and parameters are basically the same as those in Example 1.

[0087] The prepared aromatic antibacterial composite yarn has a durability of 1290 days; the antibacterial rate against Candida albicans is 94.2%, the antibacterial rate against Escherichia coli is 95.3%, and the antibacterial rate against Staphylococcus aureus is 99.2%; the breaking strength is 0.70 cN / dtex, and the elongation at break is 442%.

[0088] It can be seen from the experimental data of the comparative examples and embodiments that as the content of nano-ZnO increases, the antibacterial property increases, and since ZnO plays a heterogeneous nucleation role, the entanglement between the molecular chains increases, and the elongation at break gradually increases. However, if the content of nano-ZnO in the antibacterial masterbatch exceeds 10%, agglomeration will occur, the antibacterial property will decrease, and the mechanical properties will also decrease.

[0089] As the proportion of flavor nanocapsules increases, more flavor will be dispersed in the spandex micropores, and the durability of the fragrance will increase. When the proportion of flavor nanocapsules exceeds 40%, it will have a certain impact on the performance of PU and the durability of the fragrance. When the proportion of flavor nanocapsules is large, the amount of adsorption on the inner wall of PU will increase, and the elongation at break of PU will decrease.

[0090] By dipping PU in fragrance, the fragrance will only adhere to the surface of the PU, and the lasting effect will not be very long. By blending PU and fragrance, the fragrance will not be strong enough, and the fragrance will become weaker over time, and the lasting effect will be greatly reduced.

[0091] The test methods for the persistence of fragrance, antibacterial rate, breaking strength, and elongation at break in the above examples and comparative examples are as follows:

[0092] (1) Fragrance persistence test: Ten samples were placed in an open container indoors. The mass of the aromatic hollow fiber was weighed regularly using an electronic balance with an accuracy of 0.0001 g. The samples were weighed at 10 days, 30 days, and 50 days respectively. The fragrance persistence was estimated based on the weight loss rate.

[0093] (2) Antibacterial rate: GB / T20944.3-2008 standard was used to test the antibacterial rate of aromatic antibacterial composite yarn against Candida albicans, Escherichia coli and Staphylococcus aureus.

[0094] (3) Breaking strength: The breaking strength of the aromatic antibacterial composite yarn was tested using the GB / T3916-2013 standard.

[0095] (4) Elongation at break: The elongation at break of the aromatic antibacterial composite yarn was tested using the GB / T 3916-2013 standard.

[0096] The present invention relates to a method for preparing an aromatic antibacterial composite yarn. The antibacterial fiber is melt-spun to serve as the mechanical support of the composite yarn, and the aromatic hollow fiber is melt-spun to retain the fragrance. Specifically, an antibacterial masterbatch is first prepared using a screw extruder. Then, an antibacterial fiber filament bundle and an aromatic fiber filament bundle are separately prepared using a melt spinning method. Finally, the two fibers are blended to obtain an aromatic antibacterial composite yarn. The present invention utilizes an improved spinneret to prepare aromatic fiber filament bundles, which have longer-lasting fragrance retention and higher mechanical properties. The antibacterial fiber filament bundles prepared using the present invention have a higher antibacterial rate. The antibacterial masterbatch contains ZnO and nylon 6, and the antibacterial fiber filament bundles are obtained by spinning the antibacterial masterbatch and nylon 6. The aromatic hollow fibers contain jasmine essence nanocapsules and spandex. When the aromatic fiber filament bundles are prepared using a melt spinning method, the jasmine essence nanocapsules are injected into the hollow fibers. The main function of nylon 6 is to serve as mechanical support, ZnO plays an antibacterial role, spandex makes the entire composite yarn elastic, and jasmine essence nanocapsules mainly maintain the persistence of the fragrance. Through this structure and method, the aromatic antibacterial composite yarn can be used in aromatic clothing, accessories, bedding and other fields.

[0097] The above-described embodiments, prepared by the methods of the present invention, are intended only to illustrate the technical concepts and features of the present invention. Their purpose is to enable those skilled in the art to understand the present invention and implement it accordingly. They are not intended to limit the scope of protection of the present invention. Any equivalent variations or modifications made in accordance with the spirit and substance of the present invention are intended to be encompassed within the scope of protection of the present invention.

Claims

1. A method for preparing an aromatic antibacterial composite yarn, characterized in that: The steps include: Preparation of hollow fibers, and during the preparation of the hollow fibers, injection of nanocapsules containing fragrance into the hollow fibers' cavities, melting the nanocapsules using the temperature of the melt spinning process and dispersing and filling the hollow fibers, and resolidifying and stabilizing the fragrance nanocapsules after cooling to obtain aromatic fiber filament bundles; blending the aromatic fiber filament bundle and the antibacterial fiber filament bundle to obtain an aromatic antibacterial composite yarn; The mass fraction of the nanocapsules in the aromatic fiber filament bundle is 30-40%.

2. The preparation method according to claim 1, characterized in that The antibacterial fiber filament bundle is prepared by melt spinning antibacterial masterbatch and nylon 6; the mass fraction of the antibacterial masterbatch in the raw materials of the antibacterial fiber filament bundle is 1-5%.

3. The preparation method according to claim 2, characterized in that The raw materials of the antibacterial masterbatch are nano ZnO, nylon 6 and a dispersant. The mass fraction of the dispersant in the raw materials of the antibacterial masterbatch is 0.5-1.5%, and the mass fraction of the nano ZnO is 3-10%.

4. The preparation method according to claim 1, characterized in that The hollow fiber is spandex.

5. The preparation method according to claim 1 or 4, characterized in that The core material of the nanocapsule is jasmine essence, the wall material is n-butyl methacrylate, the emulsifier is polyoxyethylene stearyl ether, and the initiator is azobisisobutylamidine hydrochloride.

6. The preparation method according to claim 5, characterized in that The nanocapsules are prepared by the following steps: uniformly mixing jasmine essence and n-butyl methacrylate to obtain an oil phase; adding azobisisobutylamidine hydrochloride into water to form an initiator solution; dissolving polyoxyethylene stearyl ether in the initiator solution to form an aqueous phase; mixing the aqueous phase and the oil phase to prepare an emulsion; and stirring at 70-90° C. to obtain the nanocapsules.

7. The preparation method according to claim 1, characterized in that The aromatic fiber filament bundle and the antibacterial fiber filament bundle are both prepared by melt spinning. The process parameters of the melt spinning are: spinning temperature of 180-260° C., spinning speed of 200-1000 m / min, melt pressure of 8.0-15.0 MPa, side blowing temperature of 5-10° C., and stretch ratio of 2-3.

8. The preparation method according to claim 1, characterized in that The fragrance durability of the prepared aromatic antibacterial composite yarn is 735~1236d, the antibacterial rate of the aromatic antibacterial composite yarn against Candida albicans is 91.2~94.5%, the antibacterial rate of the aromatic antibacterial composite yarn against Escherichia coli is 92.3~95.6%, and the antibacterial rate of the aromatic antibacterial composite yarn against Staphylococcus aureus is 97.7~99.5%; the breaking strength of the prepared aromatic antibacterial composite yarn is 0.7~0.9cN / dtex, and the elongation at break is 450~600%.

9. A fragrant antibacterial composite yarn prepared by the preparation method according to any one of claims 1 to 8.

10. Use of the aromatic antibacterial composite yarn prepared by the preparation method according to any one of claims 1 to 8 in textiles.

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