Wormwood fiber and method for preparing knitted sweater from wormwood fiber
By incorporating modified gum arabic, chitosan, and xylitol into the knitted sweater, dense microcapsules are formed from Artemisia argyi fibers, solving the health risks associated with chemical insect repellents. This achieves a safe and healthy insect-repelling effect and moisture-wicking properties, while also enhancing wearing comfort.
Patent Information
- Application Number
- CN202511744764.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-25
- Publication Date
- 2026-02-27
AI Technical Summary
Existing chemical insect repellents pose health risks when used in knitted sweaters and cannot meet the requirements for safe and healthy wear, especially unsuitable for infants, pregnant women, and people with sensitive skin.
The method of preparing knitted sweaters using Artemisia argyi fiber involves introducing modified gum arabic, chitosan, and xylitol into the fiber to form microcapsules with insect-repellent properties. Citronellol and genipin are cross-linked to form dense microcapsule walls, which are then combined with a hydrophilic polyester substrate to enhance the fiber's moisture absorption and breathability as well as its insect-repellent effect.
It achieves a safe and healthy insect-repellent effect, while also possessing excellent moisture absorption and breathability and wearing comfort, making it suitable for people of multiple ages.
Smart Images
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Figure BDA0005705472650000111
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of textiles, in particular to an artemisia fiber and a method for preparing a knitted undershirt from the artemisia fiber. BACKGROUND
[0002] Summer is the season when mosquitoes are most active. Knitted undershirts are close-fitting clothes that people wear daily, and their anti-mosquito performance is an important indicator of the wearing experience. As people's living standards improve, the functionality and safety of close-fitting clothes are increasingly demanded, and the anti-mosquito function has gradually become one of the important properties of knitted undershirts. Good anti-mosquito performance can effectively reduce mosquito bites and improve the comfort and health of people in summer. In the textile industry, research to improve the anti-mosquito performance of clothes has always been an important direction, which not only relates to the actual needs of consumers, but also affects the development and innovation of the entire industry.
[0003] Currently, in order to improve the anti-mosquito performance of knitted undershirts, the industry usually uses the method of spraying or padding chemical anti-mosquito agents such as pyrethroid compounds during fabric finishing. This method is a common way of treating fabrics to prevent insects, and it achieves the purpose of preventing insects by attaching chemical anti-mosquito agents to the surface of the fabric. Anti-mosquito treatment during the finishing stage of fabric production is relatively simple to operate and can meet the market demand for anti-mosquito clothes to some extent. This method can be widely used in the production process of various knitted undershirts and has certain universality and operability.
[0004] However, the use of chemical anti-mosquito agents in the prior art has obvious defects. Chemical anti-mosquito agents can easily penetrate into the human body through skin contact, and long-term wearing may cause skin allergies, respiratory irritation and other health problems, especially for infants, pregnant women and people with sensitive skin. This health risk limits the application range of knitted undershirts treated with chemical anti-mosquito agents, which cannot meet the consumers' demand for safety and health, and therefore needs to be improved. SUMMARY
[0005] To solve the above problems, the present application provides an artemisia fiber and a method for preparing a knitted undershirt from the artemisia fiber.
[0006] The artemisia fiber and the method for preparing a knitted undershirt from the artemisia fiber provided by the present application adopt the following technical solution: In a first aspect, the present application provides an artemisia fiber, which adopts the following technical solution: An artemisia fiber, comprising the following components in parts by mass: hydrophilic polyester 85-95 parts artemisia microcapsules 8-12 parts; The artemisia microcapsules are prepared by the following steps: The arable gum solution is added into the wormwood extract solution, and after stirring, the chitosan solution is added, and after emulsification, the pH of the emulsion is adjusted to be acidic, and after stirring and reaction, the pH of the emulsion is adjusted to be alkaline, the genipin solution is added into the emulsion, and after stirring and reaction, cooling, centrifugation, washing and drying, the wormwood microcapsule is obtained; The arable gum is modified by the following steps: The arable gum is added into the solvent, and the citronellol and immobilized lipase are added to obtain a reaction solution, and the reaction is carried out by heating and oscillation, and after filtration, purification and drying, the modified arable gum is obtained.
[0007] The citronellol with the insect repellent effect is grafted onto the molecular chain of the arable gum, so that the arable gum can be used as the microcapsule wall material to coat the wormwood extract and also has the insect repellent function, and the citronellol forms a synergistic insect repellent effect with the wormwood ingredient in the core material; the dense microcapsule wall formed by the crosslinking of the genipin can improve the stability of the microcapsule, effectively control the slow release of the active ingredient, and prolong the action time; the hydrophilic polyester base material and the microcapsule jointly act on the fiber to improve the moisture absorption and transmission capacity of the fiber, and improve the moisture absorption and moisture permeability of the fabric, so that the functionality and wearing comfort of the product are considered.
[0008] Preferably, the mass ratio of the arable gum, the citronellol and the immobilized lipase is 1:(0.15-0.25):0.1.
[0009] The modified arable gum prepared according to the above mass ratio can graft the citronellol to the polymer skeleton in the form of a covalent bond through an enzymatic esterification reaction, so that the wall material itself has a sustained insect repellent function, and forms a double protection mechanism with the wormwood extract in the core material; meanwhile, the hydrophobic segment introduced after modification helps to form a more dense microcapsule interface layer, delays the release of the effective ingredient, and the synergistic effect of the hydrophilic polyester base material and the microcapsule can improve the overall performance of the fiber, so that the durability of the insect repellent effect and the air permeability and comfort of the fabric are considered.
[0010] Preferably, the chitosan is modified by the following steps: Under a protective atmosphere, the gallnut acid is added into the chitosan solution, and under the condition of stirring, the initiator is added, and after heating and reaction, the modified chitosan is obtained by precipitation, washing and drying.
[0011] The chitosan is modified by the gallnut acid, the polyphenol structure of the gallnut acid is grafted to the molecular chain of the chitosan under a protective atmosphere, the introduced phenolic hydroxyl group not only enhances the antioxidant properties of the wall material, but also has the insect repellent activity itself and forms a complement with the wormwood ingredient in the microcapsule; meanwhile, the increased hydrophilic group after modification improves the moisture absorption and transmission capacity, and improves the moisture absorption and moisture permeability of the fiber.
[0012] Preferably, the mass ratio of the chitosan and the gallnut acid is 1:(0.25-0.35).
[0013] The modified chitosan prepared according to the mass ratio can effectively combine the polyphenol hydroxyl group in the gallnut acid molecule with the chitosan chain, thereby enhancing the biological activity of the wall material while maintaining the stability of the microcapsule structure, improving the insect-repelling effect and moisture absorption and moisture permeability of the wormwood microcapsule.
[0014] Preferably, the raw material for preparing the wormwood microcapsule further comprises xylitol, and the following steps are adopted for the preparation: The xylitol and the wormwood extract are added to a solvent, and after stirring, a mixed solution is obtained; an acacia solution is added to the mixed solution, and after stirring, a chitosan solution is added; after heating and stirring, emulsification is performed to obtain an emulsion; the pH of the emulsion is adjusted to be acidic, and after stirring and reaction, the pH of the emulsion is adjusted to be alkaline; a genipin solution is added to the emulsion, and after stirring and reaction, cooling, centrifugation, washing and drying are performed to obtain the wormwood microcapsule.
[0015] The xylitol and the wormwood extract are compounded to form a composite core material, which can maintain the stability of the insect-repelling active ingredient, and the hydrophilic property of the xylitol can improve the local wetness during the use of the fiber, and the phase change endothermic effect can also provide auxiliary contact coolness, thereby improving the insect-repelling effect and moisture absorption and moisture permeability of the microcapsule.
[0016] Preferably, the mass ratio of the xylitol and the wormwood extract is (0.3-0.4):1.
[0017] The above-mentioned mass ratio can effectively improve the synergistic effect of the xylitol and the wormwood extract, thereby improving the insect-repelling effect and moisture absorption and moisture permeability of the microcapsule.
[0018] Preferably, the hydrophilic polyester is prepared by the following steps: The terephthalic acid and the ethylene glycol are mixed, and a catalyst and a heat stabilizer are added for esterification reaction; a mixed monomer of N,N'-adipoyl piperazine and polyethylene glycol is added for polycondensation reaction; after the reaction is completed, water cooling and granulation are performed to obtain the hydrophilic polyester.
[0019] The introduction of the polyethylene glycol flexible chain segment and the N,N'-adipoyl piperazine monomer in the polyester polymerization process enables the synthesized polyester molecular chain to simultaneously embed the hydrophilic ether bond and the flexible amide group, which not only improves the moisture absorption capacity of the fiber to improve the moisture absorption and moisture permeability of the fabric, but also enhances the flexibility of the molecular chain to provide a more stable mechanical bonding interface for the wormwood microcapsule, thereby improving the insect-repelling effect and moisture absorption and moisture permeability of the wormwood fiber, and the fiber has good comfort.
[0020] In a second aspect, the application provides a method for preparing a knitted undershirt from wormwood fiber, which adopts the following technical solution: A method for preparing knitted undershirts from Artemisia argyi fibers includes the following steps: Artemisia fibers and cotton fibers are mixed, opened, combed, drawn, roving, and spun to obtain blended yarn; the blended yarn is woven into greige fabric, which is then shaped, cut, and sewn to obtain knitted undershirts.
[0021] The knitted sweater prepared according to the above steps has a synergistic protective effect formed by the slow-release insect-repelling ingredients of Artemisia argyi microcapsules and the skin-friendly properties of cotton fibers. At the same time, the blended structure of hydrophilic polyester and cotton fibers promotes moisture conduction through capillary effect, so that the fabric maintains a suitable moisture balance while maintaining natural insect-repelling function, and has both good protection and comfort.
[0022] In summary, this application includes at least one of the following beneficial technical effects: 1. By grafting citronellol, which has insect-repellent effects, onto the molecular chain of gum arabic, it serves as the microcapsule wall material, encapsulating Artemisia argyi extract while also possessing insect-repellent properties, creating a synergistic insect-repellent effect with the Artemisia argyi components in the core material. The dense microcapsule wall formed by genipin crosslinking enhances the stability of the microcapsules, effectively controlling the slow release of active ingredients and prolonging the duration of action. The hydrophilic polyester substrate works together with the microcapsules to improve the moisture absorption and conduction capacity of the fibers, thereby enhancing the moisture absorption and breathability of the fabric, thus balancing the product's functionality and wearing comfort, ensuring product safety and health.
[0023] 2. By modifying chitosan with gallic acid, its polyphenol structure can be grafted onto the chitosan molecular chain under a protective atmosphere. The introduced phenolic hydroxyl groups not only enhance the antioxidant properties of the wall material, but also complement the insect-repellent activity of the gallic acid with the mugwort components in the microcapsules. At the same time, the hydrophilic groups added after modification improve the moisture adsorption and transfer capacity, thereby enhancing the moisture absorption and permeability of the fiber.
[0024] 3. By combining xylitol with Artemisia argyi extract to form a composite core material, the stability of the insect-repelling active ingredients is maintained. The hydrophilic properties of xylitol can improve local wettability during fiber use, and its phase change endothermic effect can also provide an auxiliary cooling sensation upon contact, thereby enhancing the insect-repelling effect and moisture absorption and wicking properties of the microcapsules. Detailed Implementation
[0025] This application discloses an artemisia fiber and a method for preparing knitted undershirts from the artemisia fiber. Unless otherwise specified, all raw materials used in this application are commercially available. The following detailed description, in conjunction with embodiments, further illustrates this application: Raw material specifications: Gum arabic (CP2020), purchased from Shanxi Jinyang Pharmaceutical Excipients Co., Ltd.; Citronellol (CAS No.: 106-22-9); Immobilized lipase (Lipozyme). 435 was purchased from Hangzhou Libang E-commerce Co., Ltd.; Artemisia argyi extract was purchased from Xi'an Ruierli Bioengineering Co., Ltd.; chitosan was purchased from Zhejiang Yicun Biotechnology Co., Ltd.; genipin (CAS No.: 6902-77-8), terephthalic acid (CAS No.: 100-21-0), ethylene glycol (CAS No.: 107-21-1), N,N'-hexamyl pentyldiamine (CAS No.: 3424-60-0), polyethylene glycol 400 was purchased from Jinan Xinke Chemical Co., Ltd.; tetrabutyl titanate (CAS No.: 5593-70-4), triphenyl phosphate (CAS No.: 115-86-6), gallic acid (CAS No.: 149-91-7), ascorbic acid (CAS No.: 50-81-7), xylitol (CAS No.: 87-99-0).
[0026] Example 1 The modified gum arabic, gum arabic, citronellol, and immobilized lipase were prepared in a mass ratio of 1:0.15:0.1. Gum arabic was added to phosphate buffer (0.1 mol / L, pH 7.0) with a solid content of 10%. Citronellol and immobilized lipase were added to obtain a reaction solution. 10% of the total volume of the reaction solution was added to tert-butanol. The mixture was shaken at 150 rpm at 50 °C for 24 h. After filtration, the filtrate was purified by dialyzing and then freeze-dried at -20 °C to obtain modified gum arabic.
[0027] Preparation of Artemisia argyi microcapsules The mass ratio of Artemisia argyi extract, modified gum arabic, chitosan, and genipin was 100:5:3:2.
[0028] Artemisia argyi extract was added to a solvent (70% ethanol aqueous solution) and stirred at 300 rpm for 30 min at 50 °C. Modified gum arabic aqueous solution (5% by mass) was added to the Artemisia argyi extract solution and stirred at 300 rpm for 15 min at 50 °C. Then, chitosan solution (3% by mass, 1% acetic acid aqueous solution by volume) was added and stirred at 300 rpm for 15 min at 50 °C. Finally, the mixture was sheared and emulsified at 10000 rpm for 5 min to obtain the desired product. The emulsion was prepared by stirring at 50°C and 400 rpm, adjusting the pH to 4.5 with a 1% (v / v) acetic acid aqueous solution, stirring for 30 min, and then adjusting the pH to 8.0 with a 0.1 mol / L sodium hydroxide aqueous solution. Genipin aqueous solution (2% (w / w)) was added to the emulsion, and the mixture was stirred at 50°C and 300 rpm for 4 h. After cooling to below 30°C, the mixture was transferred to 4°C for 12 h, centrifuged, washed with deionized water, and freeze-dried at -20°C to obtain Artemisia argyi microcapsules.
[0029] Preparation of hydrophilic polyester The mass ratio of terephthalic acid, ethylene glycol, N,N'-adipamide and polyethylene glycol is 1:0.69:0.08:0.03, and the polyethylene glycol is polyethylene glycol 400.
[0030] Terephthalic acid and ethylene glycol were mixed, and a catalyst (tetrabutyl titanate, accounting for 0.03% of the mass of terephthalic acid) and a heat stabilizer (triphenyl phosphate, accounting for 0.02% of the mass of terephthalic acid) were added. The mixture was stirred at 200 rpm for 3 hours at 250°C, 0.3 MPa, and a nitrogen protective atmosphere. After depressurization, a mixture of N,N'-pentanediamine adipate and polyethylene glycol monomers was added. The temperature was raised to 270°C, and a vacuum was drawn to a vacuum degree of less than 100 Pa. The mixture was stirred at 100 rpm for 4 hours. After the reaction was completed, the vacuum was released with nitrogen, and the mixture was water-cooled and granulated to obtain a hydrophilic polyester.
[0031] Preparation of Artemisia argyi fiber Weigh 85 parts of hydrophilic polyester and 8 parts of Artemisia argyi microcapsules.
[0032] Hydrophilic polyester and Artemisia argyi microcapsules were mixed and stirred at 60°C and 20 rpm for 30 minutes. The mixture was then fed into a twin-screw extruder for melt blending. The temperature was 250°C in zone 1, 260°C in zone 2, 265°C in zone 3, 270°C in zone 4, 275°C in zone 5, and 270°C at the die head. The screw speed was 60 rpm. The melt was metered and pumped through a metering pump and then extruded through a circular spinneret to form nascent fibers. After cooling, stretching, setting, and winding, Artemisia argyi fibers were obtained.
[0033] Preparation of knitted sweaters Artemisia fibers and cotton fibers are mixed at a mass ratio of 40:60, and after opening, combing, drawing, roving, and spinning, a blended yarn is obtained. The blended yarn is woven into a greige fabric, which is then shaped and finished at 130℃, cut, and sewn to obtain a knitted undershirt.
[0034] Example 2 The modified gum arabic, gum arabic, citronellol, and immobilized lipase were prepared in a mass ratio of 1:0.25:0.1. Gum arabic was added to phosphate buffer (0.1 mol / L, pH 7.0) with a solid content of 10%. Citronellol and immobilized lipase were added to obtain a reaction solution. 10% of the total volume of the reaction solution was added to tert-butanol. The mixture was shaken at 150 rpm at 50 °C for 24 h. After filtration, the filtrate was purified by dialyzing and then freeze-dried at -20 °C to obtain modified gum arabic.
[0035] Preparation of Artemisia argyi microcapsules The mass ratio of Artemisia argyi extract, modified gum arabic, chitosan, and genipin was 100:5:3:2.
[0036] Artemisia argyi extract was added to a solvent (70% ethanol aqueous solution) and stirred at 300 rpm for 30 min at 50 °C. Modified gum arabic aqueous solution (5% by mass) was added to the Artemisia argyi extract solution and stirred at 300 rpm for 15 min at 50 °C. Then, chitosan solution (3% by mass, 1% acetic acid aqueous solution by volume) was added and stirred at 300 rpm for 15 min at 50 °C. Finally, the mixture was sheared and emulsified at 10000 rpm for 5 min to obtain the desired product. The emulsion was prepared by stirring at 50°C and 400 rpm, adjusting the pH to 4.5 with a 1% (v / v) acetic acid aqueous solution, stirring for 30 min, and then adjusting the pH to 8.0 with a 0.1 mol / L sodium hydroxide aqueous solution. Genipin aqueous solution (2% (w / w)) was added to the emulsion, and the mixture was stirred at 50°C and 300 rpm for 4 h. After cooling to below 30°C, the mixture was transferred to 4°C for 12 h, centrifuged, washed with deionized water, and freeze-dried at -20°C to obtain Artemisia argyi microcapsules.
[0037] Preparation of hydrophilic polyester The mass ratio of terephthalic acid, ethylene glycol, N,N'-adipamide and polyethylene glycol is 1:0.69:0.08:0.03, and the polyethylene glycol is polyethylene glycol 400.
[0038] Terephthalic acid and ethylene glycol were mixed, and a catalyst (tetrabutyl titanate, accounting for 0.03% of the mass of terephthalic acid) and a heat stabilizer (triphenyl phosphate, accounting for 0.02% of the mass of terephthalic acid) were added. The mixture was stirred at 200 rpm for 3 hours at 250°C, 0.3 MPa, and a nitrogen protective atmosphere. After depressurization, a mixture of N,N'-pentanediamine adipate and polyethylene glycol monomers was added. The temperature was raised to 270°C, and a vacuum was drawn to a vacuum degree of less than 100 Pa. The mixture was stirred at 100 rpm for 4 hours. After the reaction was completed, the vacuum was released with nitrogen, and the mixture was water-cooled and granulated to obtain a hydrophilic polyester.
[0039] Preparation of Artemisia argyi fiber Weigh 95 parts of hydrophilic polyester and 12 parts of Artemisia argyi microcapsules.
[0040] Hydrophilic polyester and Artemisia argyi microcapsules were mixed and stirred at 60°C and 20 rpm for 30 minutes. The mixture was then fed into a twin-screw extruder for melt blending. The temperature was 250°C in zone 1, 260°C in zone 2, 265°C in zone 3, 270°C in zone 4, 275°C in zone 5, and 270°C at the die head. The screw speed was 60 rpm. The melt was metered and pumped through a metering pump and then extruded through a circular spinneret to form nascent fibers. After cooling, stretching, setting, and winding, Artemisia argyi fibers were obtained.
[0041] Preparation of knitted sweaters Artemisia fibers and cotton fibers are mixed at a mass ratio of 40:60, and after opening, combing, drawing, roving, and spinning, a blended yarn is obtained. The blended yarn is woven into a greige fabric, which is then shaped and finished at 130℃, cut, and sewn to obtain a knitted undershirt.
[0042] Example 3 The modified gum arabic, gum arabic, citronellol, and immobilized lipase were prepared in a mass ratio of 1:0.2:0.1. Gum arabic was added to phosphate buffer (0.1 mol / L, pH 7.0) with a solid content of 10%. Citronellol and immobilized lipase were added to obtain a reaction solution. 10% of the total volume of the reaction solution was added to tert-butanol. The mixture was shaken at 150 rpm at 50 °C for 24 h. After filtration, the filtrate was purified by dialyzing and then freeze-dried at -20 °C to obtain modified gum arabic.
[0043] Preparation of Artemisia argyi microcapsules The mass ratio of Artemisia argyi extract, modified gum arabic, chitosan, and genipin was 100:5:3:2.
[0044] Artemisia argyi extract was added to a solvent (70% ethanol aqueous solution) and stirred at 300 rpm for 30 min at 50 °C. Modified gum arabic aqueous solution (5% by mass) was added to the Artemisia argyi extract solution and stirred at 300 rpm for 15 min at 50 °C. Then, chitosan solution (3% by mass, 1% acetic acid aqueous solution by volume) was added and stirred at 300 rpm for 15 min at 50 °C. Finally, the mixture was sheared and emulsified at 10000 rpm for 5 min to obtain the desired product. The emulsion was prepared by stirring at 50°C and 400 rpm, adjusting the pH to 4.5 with a 1% (v / v) acetic acid aqueous solution, stirring for 30 min, and then adjusting the pH to 8.0 with a 0.1 mol / L sodium hydroxide aqueous solution. Genipin aqueous solution (2% (w / w)) was added to the emulsion, and the mixture was stirred at 50°C and 300 rpm for 4 h. After cooling to below 30°C, the mixture was transferred to 4°C for 12 h, centrifuged, washed with deionized water, and freeze-dried at -20°C to obtain Artemisia argyi microcapsules.
[0045] Preparation of hydrophilic polyester The mass ratio of terephthalic acid, ethylene glycol, N,N'-adipamide and polyethylene glycol is 1:0.69:0.08:0.03, and the polyethylene glycol is polyethylene glycol 400.
[0046] Terephthalic acid and ethylene glycol were mixed, and a catalyst (tetrabutyl titanate, accounting for 0.03% of the mass of terephthalic acid) and a heat stabilizer (triphenyl phosphate, accounting for 0.02% of the mass of terephthalic acid) were added. The mixture was stirred at 200 rpm for 3 hours at 250°C, 0.3 MPa, and a nitrogen protective atmosphere. After depressurization, a mixture of N,N'-pentanediamine adipate and polyethylene glycol monomers was added. The temperature was raised to 270°C, and a vacuum was drawn to a vacuum degree of less than 100 Pa. The mixture was stirred at 100 rpm for 4 hours. After the reaction was completed, the vacuum was released with nitrogen, and the mixture was water-cooled and granulated to obtain a hydrophilic polyester.
[0047] Preparation of Artemisia argyi fiber Weigh 90 parts of hydrophilic polyester and 10 parts of Artemisia argyi microcapsules.
[0048] Hydrophilic polyester and Artemisia argyi microcapsules were mixed and stirred at 60°C and 20 rpm for 30 minutes. The mixture was then fed into a twin-screw extruder for melt blending. The temperature was 250°C in zone 1, 260°C in zone 2, 265°C in zone 3, 270°C in zone 4, 275°C in zone 5, and 270°C at the die head. The screw speed was 60 rpm. The melt was metered and pumped through a metering pump and then extruded through a circular spinneret to form nascent fibers. After cooling, stretching, setting, and winding, Artemisia argyi fibers were obtained.
[0049] Preparation of knitted sweaters Artemisia fibers and cotton fibers are mixed at a mass ratio of 40:60, and after opening, combing, drawing, roving, and spinning, a blended yarn is obtained. The blended yarn is woven into a greige fabric, which is then shaped and finished at 130℃, cut, and sewn to obtain a knitted undershirt.
[0050] Example 4 Example 4 is based on Example 3. The only difference between Example 4 and Example 3 is that the mass ratio of gum arabic, citronellol and immobilized lipase is 1:0.1:0.1 when preparing modified gum arabic in Example 4.
[0051] Example 5 Example 5 is based on Example 3. The only difference between Example 5 and Example 3 is that in Example 5, the mass ratio of gum arabic, citronellol and immobilized lipase is 1:0.3:0.1 when preparing modified gum arabic.
[0052] Example 6 Example 6 is based on Example 3. The only difference between Example 6 and Example 3 is that the chitosan in Example 6 has been modified and prepared using the following steps: The mass ratio of chitosan to gallic acid is 1:0.25, and the initiator consists of potassium persulfate and ascorbic acid in a mass ratio of 1:0.5.
[0053] Under a nitrogen protective atmosphere, gallic acid was added to a chitosan solution (2% by mass, 1% by volume acetic acid aqueous solution as solvent), and an initiator (5% by mass of chitosan) was added while stirring at 200 rpm. The reaction was carried out at 70°C for 2 hours. After the reaction was completed, the solution was poured into anhydrous ethanol for precipitation, washed with an ethanol-water solution (9:1 by volume), and freeze-dried at -20°C to obtain modified chitosan.
[0054] Example 7 Example 7 is based on Example 6. The only difference between Example 7 and Example 6 is that the mass ratio of chitosan to gallic acid in Example 7 is 1:0.35.
[0055] Example 8 Example 8 is based on Example 6. The only difference between Example 8 and Example 6 is that the mass ratio of chitosan to gallic acid in Example 8 is 1:0.3.
[0056] Example 9 Example 9 is based on Example 6. The only difference between Example 9 and Example 6 is that the mass ratio of chitosan to gallic acid in Example 9 is 1:0.15.
[0057] Example 10 Example 10 is based on Example 6. The only difference between Example 10 and Example 6 is that the mass ratio of chitosan to gallic acid in Example 10 is 1:0.5.
[0058] Example 11 Example 11 is based on Example 3. The only difference between Example 11 and Example 3 is that the raw material for preparing the Artemisia argyi microcapsules in Example 11 also includes xylitol. The preparation is carried out using the following steps: The mass ratio of xylitol to Artemisia argyi extract is 0.3:1, and the mass ratio of Artemisia argyi extract, chitosan, gum arabic, and genipin is 100:5:3:2.
[0059] Xylitol was added to a solvent (70% aqueous ethanol solution), and stirred at 300 rpm for 30 min at 50°C. Artemisia argyi extract was then added, and the mixture was stirred at 300 rpm for 30 min at 50°C to obtain a mixed solution. Modified gum arabic aqueous solution (5% by mass) was added to the mixed solution, and the mixture was stirred at 300 rpm for 15 min at 50°C. Chitosan solution (3% by mass, 1% acetic acid aqueous solution by volume) was then added, and the mixture was stirred at 300 rpm for 15 min at 50°C. Finally, the mixture was stirred at 10000 rpm. The emulsion was sheared at a speed of pm for 5 min to obtain an emulsion. Under the conditions of stirring at 50℃ and 400 rpm, the pH was adjusted to 4.5 with a volume concentration of 1% acetic acid aqueous solution. After stirring for 30 min, the pH of the emulsion was adjusted to 8.0 with a 0.1 mol / L sodium hydroxide aqueous solution. Genipin aqueous solution (mass concentration of 2%) was added to the emulsion. After stirring at 300 rpm at 50℃ for 4 h, the mixture was cooled to below 30℃, transferred to 4℃ for refrigeration for 12 h, centrifuged, washed with deionized water, and freeze-dried at -20℃ to obtain Artemisia argyi microcapsules.
[0060] Example 12 Example 12 is based on Example 3. The only difference between Example 12 and Example 3 is that the mass ratio of xylitol to Artemisia argyi extract in Example 12 is 0.4:1.
[0061] Example 13 Example 13 is based on Example 3. The only difference between Example 13 and Example 3 is that the mass ratio of xylitol to Artemisia argyi extract in Example 13 is 0.35:1.
[0062] Example 14 Example 14 is based on Example 3. The only difference between Example 14 and Example 3 is that the mass ratio of xylitol to Artemisia argyi extract in Example 14 is 0.2:1.
[0063] Example 15 Example 15 is based on Example 3. The only difference between Example 15 and Example 3 is that the mass ratio of xylitol to Artemisia argyi extract in Example 15 is 0.5:1.
[0064] Comparative Example 1 In Comparative Example 1, the modified gum arabic was replaced with gum arabic when preparing Artemisia argyi microcapsules.
[0065] Preparation of Artemisia argyi microcapsules The mass ratio of Artemisia argyi extract, gum arabic, chitosan, and genipin was 100:5:3:2.
[0066] Artemisia argyi extract was added to a solvent (70% ethanol aqueous solution) and stirred at 300 rpm for 30 min at 50 °C. Then, a 5% (w / w) gum arabic aqueous solution was added to the Artemisia argyi extract solution and stirred at 300 rpm for 15 min at 50 °C. Next, a 3% (w / w) chitosan solution (1% (v / v) acetic acid aqueous solution) was added and stirred at 300 rpm for 15 min at 50 °C. Finally, the mixture was sheared and emulsified at 10,000 rpm for 5 min to obtain the emulsion. The emulsion was stirred at 50°C and 400 rpm, and the pH was adjusted to 4.5 using a 1% acetic acid aqueous solution. After stirring for 30 min, the pH of the emulsion was adjusted to 8.0 using a 0.1 mol / L sodium hydroxide aqueous solution. Genipin aqueous solution (2% by mass) was added to the emulsion, and the reaction was carried out at 50°C and 300 rpm for 4 h. After cooling to below 30°C, the mixture was transferred to 4°C for 12 h, centrifuged, washed with deionized water, and freeze-dried at -20°C to obtain Artemisia argyi microcapsules.
[0067] Comparative Example 2 In Comparative Example 2, no genipin was added when preparing Artemisia argyi microcapsules.
[0068] Preparation of Artemisia argyi microcapsules The mass ratio of Artemisia argyi extract, modified gum arabic, and chitosan was 100:5:3.
[0069] Artemisia argyi extract was added to a solvent (70% ethanol aqueous solution) and stirred at 300 rpm for 30 min at 50 °C. Modified gum arabic aqueous solution (5% by mass) was added to the Artemisia argyi extract solution and stirred at 300 rpm for 15 min at 50 °C. Then, chitosan solution (3% by mass, 1% acetic acid aqueous solution by volume) was added and stirred at 300 rpm for 15 min at 50 °C. The mixture was then sheared and emulsified at 10,000 rpm for 5 min to obtain an emulsion. The pH was adjusted to 4.0 using 1% acetic acid aqueous solution under stirring conditions of 50 °C and 400 rpm. After stirring for 3 h, the mixture was cooled to below 10 °C, transferred to 4 °C for 12 h, centrifuged, washed with deionized water, and freeze-dried at -20 °C to obtain Artemisia argyi microcapsules.
[0070] Performance testing (1) Using GB / T 30126-2013 "Test and Evaluation of Mosquito Repellency Performance of Textiles" as the standard, the sample was cut into 25cm×25cm samples. Testers who passed the attack power test covered the sample and control sample (polyester cotton fiber knitted sweater without Artemisia microcapsules) on the inside of their forearms at intervals. The repellency tester was installed so that the round hole on its bottom surface matched the round outline on the sample fabric. 30 Aedes albopictus mosquitoes with qualified attack power were put into the repellency tester and exposed for 2 minutes. The number of mosquitoes that landed on the sample and control sample surfaces were counted respectively, and the repellency rate was calculated. The repellency rate = (number of mosquitoes landing on the control sample - number of mosquitoes landing on the test sample) / number of mosquitoes landing on the control sample × 100%. Three samples were prepared for each sample, and the average value was taken after measurement. The results were recorded in Table 1.
[0071] (2) Select GB / T 12704.1-2009 Textiles - Test Method for Moisture Permeability - Part 1: Moisture Absorption Method as the standard, use a moisture permeability cup to test, detect the change in mass, calculate the moisture permeability of the sample, prepare three samples for each sample, take the average value after measurement, and record the results in Table 1.
[0072] Table 1. Results of insect repellent efficacy and moisture absorption / permeability tests. As shown in Table 1, the repellency rate of Examples 1-3 is greater than 85.9%, and the moisture permeability is greater than 3856 g / (m³). 2 •24h), thus it can be seen that the method for preparing knitted sweaters from Artemisia argyi fiber prepared in this application has good insect repellent effect and moisture absorption and wicking properties.
[0073] As shown in Table 1, the only difference between Examples 4 and 5 and Example 3 is that the specified ratio of modified gum arabic was broken in Examples 4 and 5. Too little citronellol has a limited modification effect, while too much citronellol will destroy the stability of the wall material structure, thus reducing the performance.
[0074] As shown in Table 1, the only difference between Examples 6-10 and Example 3 is that in Examples 6-8, chitosan was modified according to the specified ratio, which effectively improved the insect repellent effect and moisture absorption and perspiration performance; in Examples 9 and 10, the specified ratio was broken, and the performance improvement effect was slightly reduced.
[0075] As shown in Table 1, the only difference between Examples 11-15 and Example 3 is that: Examples 11-13 use a limited ratio of xylitol and Artemisia argyi extract to improve the stability of the active ingredients, regulate the moisture absorption and permeability, and improve the performance; Examples 14 and 15 deviate from the limited ratio, and the performance improvement effect decreases.
[0076] As shown in Table 1, the only difference between Comparative Example 1 and Example 3 is that the modified gum arabic was replaced with gum arabic in Comparative Example 1. Compared with Example 3, the synergistic mechanism of Comparative Example 1 was affected, and the insect repellent effect was significantly reduced.
[0077] As shown in Table 1, the only difference between Comparative Example 2 and Example 3 is that genipin was not used to promote cross-linking when preparing Artemisia argyi microcapsules in Comparative Example 2. Compared with Example 3, the performance of Comparative Example 2 was significantly reduced. This is because without the use of genipin to cross-link Artemisia argyi microcapsules, the structural stability of Artemisia argyi microcapsules decreased, thereby affecting the active ingredients and significantly reducing the insect repellent effect.
[0078] This specific embodiment is merely an explanation of this application and is not intended to limit it. Based on the above description, those skilled in the art can make various changes and modifications without departing from the technical concept of this application. The technical scope of this application is not limited to the contents of the specification but must be determined according to the scope of the claims.
Claims
1. A fiber of artemisia, characterized in that: Comprise the following components by mass fraction: Hydrophilic polyester 85-95 parts Artemisia microcapsule 8-12 parts The artemisia microcapsule is prepared by the following steps: Add gum arabic solution to the artemisia extract solution, stir, then add chitosan solution, emulsify, adjust the emulsion pH to acidic, stir and react, adjust the emulsion pH to alkaline, add genipin solution to the emulsion, stir and react, cool, centrifuge, wash, and dry to obtain artemisia microcapsule; The gum arabic is modified by the following steps: Add gum arabic to a solvent, add citronellol and immobilized lipase to obtain a reaction solution, heat and oscillate to react, filter, purify, and dry to obtain modified gum arabic.
2. A fibre according to claim 1, characterised in that: The mass ratio of gum arabic, citronellol, and immobilized lipase is 1: (0.15-0.25): 0.
1.
3. The fiber of claim 1, wherein: The chitosan is modified by the following steps: Under a protective atmosphere, add gallnut acid to the chitosan solution, add initiator under stirring, heat and react, precipitate, wash, and dry to obtain modified chitosan.
4. A fibre according to claim 3, characterised in that: The mass ratio of chitosan and gallnut acid is 1: (0.25-0.35).
5. A fiber according to claim 1, wherein: The preparation raw material of the artemisia microcapsule further comprises xylitol, which is prepared by the following steps: Add xylitol and artemisia extract to a solvent, stir to obtain a mixed solution, add gum arabic solution to the mixed solution, stir, then add chitosan solution, heat and stir, emulsify, adjust the pH to acidic, stir and react, adjust the emulsion pH to alkaline, add genipin solution to the emulsion, stir and react, cool, centrifuge, wash, and dry to obtain artemisia microcapsule.
6. A fibre according to claim 5, characterised in that: The mass ratio of xylitol and artemisia extract is (0.3-0.4):
1.
7. A fiber according to claim 1, wherein: The hydrophilic polyester is prepared by the following steps: Mix terephthalic acid and ethylene glycol, add catalyst and heat stabilizer, perform esterification reaction, add mixed monomers of N, N'-hexanediamine and polyethylene glycol, perform polycondensation reaction, after the reaction is completed, water-cool and granulate to obtain hydrophilic polyester.
8. A method of making a knitted undershirt from arundo donax fibers as claimed in any one of claims 1 to 7, characterized in that: Comprise the following steps: Mix artemisia fibers and cotton fibers, open, card, draw, rove, and spin to obtain blended yarn, weave the blended yarn into gray cloth, perform setting finishing on the gray cloth, cut and sew to obtain a knit undershirt.