A highly efficient heat-dissipating regenerated cellulose fiber from Artemisia argyi and its preparation method

Abstract

This invention discloses a highly efficient heat-dissipating regenerated cellulose fiber from Artemisia argyi and its preparation method. The aforementioned regenerated cellulose fiber is prepared by spinning a spinning solution containing Artemisia argyi extract, regenerated cellulose pulp, ionic liquid, and solvent, followed by treatment in a coagulation bath containing carbon nanotubes of different diameters, a dispersant, and a solvent. The preparation method is as follows: (1) Dissolve Artemisia argyi extract and regenerated cellulose pulp in ionic liquid and solvent, and mix evenly to obtain a spinning solution; (2) Disperse carbon nanotubes of different diameters in a solvent containing a dispersant to obtain a coagulation bath; (3) After filtering and degassing the spinning solution, spin it, regenerate it in the coagulation bath, wash and stretch it with water, and finally perform post-treatment to obtain the final product. The regenerated cellulose fiber from Artemisia argyi of this invention has good strength, excellent heat dissipation, and strong spinnability, making it suitable for use in spring and summer fabrics. Moreover, the preparation method is environmentally friendly and low-carbon.

Description

Technical Field

[0001] This invention relates to the field of textile technology, specifically to a highly efficient heat-dissipating regenerated cellulose fiber from Artemisia argyi and its preparation method. Background Technology

[0002] Cooling fibers are an important category of functional fibers. Existing cooling fibers are mainly prepared by modifying the fiber's cross-section, increasing its hygroscopicity, and adding thermally conductive materials. While thermally conductive materials such as silicon nitride, alumina, and carbon-based materials have been extensively studied in recent years and possess high thermal conductivity, the heat dissipation performance of modified fibers is not solely determined by the properties of the thermally conductive material itself, but is also limited by the compatibility between the fiber and the thermally conductive material.

[0003] Artemisia argyi is a perennial herb or slightly shrubby plant belonging to the Artemisia genus of the Asteraceae family. Its stems and leaves are rich in various active substances such as flavonoids, alkaloids, polysaccharides, and terpenoid aromatic compounds, and have the effects of warming the meridians, dispelling dampness and cold, inhibiting bacteria and preventing mites, and repelling insects and mosquitoes. Adding Artemisia argyi extract to fibers can endow them with antibacterial, anti-mite, mosquito-repellent, cold-dispelling, and warming functions, but there are no reports of applying Artemisia argyi to heat-dissipating and cooling fibers. Summary of the Invention

[0004] Purpose of the invention: In order to solve the technical problems existing in the prior art, the present invention aims to provide a plant-modified regenerated cellulose fiber with high strength, good heat dissipation, high spinnability and suitable for use in spring and summer fabrics. Specifically, the present invention provides a highly efficient heat dissipation Artemisia argyi regenerated cellulose fiber and its preparation method.

[0005] Technical solution: The high-efficiency heat dissipation plant-modified regenerated cellulose fiber provided by the present invention is prepared by spinning a spinning solution containing flavonoid-containing plant extracts, regenerated cellulose pulp, ionic liquid and solvent, and then treating it in a coagulation bath containing carbon nanotubes of different diameters, dispersant and solvent.

[0006] Furthermore, in the spinning solution, the mass ratio of flavonoid-containing plant extract to regenerated cellulose pulp is 1:10-100, the mass of regenerated cellulose pulp accounts for 8-15% of the total mass of ionic liquid and solvent, and the mass ratio of ionic liquid to solvent is 1:1.5-3; the flavonoid-containing plant extract is Artemisia argyi extract.

[0007] Furthermore, in the coagulation bath, the diameter of the carbon nanotubes is 0.5-50 nm.

[0008] Furthermore, the carbon nanotubes of different diameters include large-diameter carbon nanotubes with a diameter of 10-50 nm and small-diameter carbon nanotubes with a diameter of 0.5-2 nm, with a mass ratio of large-diameter carbon nanotubes to small-diameter carbon nanotubes of 4-9:1; the mass ratio of the total mass of carbon nanotubes of different diameters to the mass of regenerated cellulose pulp is 1:20-100; the concentration of the total mass of carbon nanotubes of different diameters in the coagulation bath is 1-5 g / L; the dispersant is TNNDIS, with a mass ratio of the dispersant to the total mass of carbon nanotubes of different diameters of 1:5-10; and the volume ratio of the solvent to deionized water is 1:1.5-9.

[0009] Furthermore, the coagulation bath also includes water, with a water-to-solvent volume ratio of 1-1.5:9.

[0010] Furthermore, the regenerated cellulose pulp is bamboo pulp, wood pulp, cotton pulp, or hemp pulp, with a degree of polymerization of 400-900 and a cellulose content of over 90%.

[0011] Further, the ionic liquid is one of 3-methyl-N-butyl chloropyridine ([Bmpy]Cl), 1-butyl-3-methylimidazolium chloride ([Bmim]Cl), 1-allyl-3-methylimidazolium chloride ([Emim]Ac), or 1-ethyl-3-methylimidazolium acetate ([Amim]Cl); the solvent is one of DMSO, DMF, DMAC, or DMI.

[0012] The high-efficiency heat dissipation Artemisia regenerated cellulose fiber provided by the present invention is prepared by spinning a spinning solution containing Artemisia extract, regenerated cellulose pulp, ionic liquid and solvent, and then treating it in a coagulation bath containing carbon nanotubes of different diameters, dispersant and solvent.

[0013] Further, the preparation method of the Artemisia argyi extract is as follows: Artemisia argyi powder is added to an extract containing ionic liquid and ethanol, the pH of the system is adjusted, ultrasonic oscillation is performed, and the extract is obtained after purification and separation; the pH is 10-13; the concentration of Artemisia argyi in the extract is 10-20 g / L, the concentration of ionic liquid is 0.1-1.0 mol / L; the ultrasonic time is 60-120 min, the ultrasonic power is 500-2000 W, and the ultrasonic temperature is 30-60℃; the purification and separation is performed by FL-1 macroporous resin column chromatography.

[0014] The preparation method of the above-mentioned highly efficient heat dissipation regenerated cellulose fiber from Artemisia argyi includes the following steps:

[0015] (1) Dissolve Artemisia argyi extract and regenerated cellulose pulp in ionic liquid and solvent, and mix evenly to obtain spinning solution;

[0016] (2) Carbon nanotubes of different diameters are dispersed in a solvent containing a dispersant to obtain a coagulation bath;

[0017] (3) The spinning solution is filtered and defoamed before spinning, regenerated in a coagulation bath, washed and stretched, and finally post-treated to obtain high-efficiency heat dissipation Artemisia regenerated cellulose fiber.

[0018] Furthermore, in step (1), the dissolution temperature of the spinning solution is 60-80℃, and the dissolution time is 1-2h.

[0019] Further, in step (2), the dispersion conditions are as follows: after stirring evenly, ultrasonic dispersion is performed for 30-60 min, ultrasonic power is 2000-5000 W, and stirring speed is 1000-1500 r / min.

[0020] Furthermore, in step (3), the working temperature of the coagulation bath is 30-50℃.

[0021] Invention Principle: The carbon nanotubes used in this invention possess a high aspect ratio and excellent thermal conductivity, making them ideal for constructing heat transfer networks. However, most existing carbon nanotube heat dissipation fibers are produced by first modifying the carbon nanotubes to improve their dispersion properties, then preparing them into spinning masterbatches, which are then melted or added to the spinning solution for wet spinning. However, adding only small amounts to the fiber does not significantly improve heat dissipation, while excessive addition leads to a severe loss of the fiber's mechanical properties. Therefore, the uniformity of carbon nanotube distribution within the fiber, its crystallinity and orientation, and the integrity and density of the internal thermal conductive channels are the main factors determining the heat dissipation and mechanical properties of the modified fiber.

[0022] Based on the above problems, this invention, through numerous repeated experiments, sets carbon nanotubes of different diameters in the coagulation bath and sets a specific addition ratio. Relying on the synergistic effect between the two types of carbon nanotubes and taking advantage of the dispersibility of flavonoid-containing plant extracts in the spinning solution, a complete and dense heat-conducting channel is formed along the axial direction in the shallow layer of cellulose through coagulation and stretching, which significantly improves the heat dissipation performance of the fiber without affecting the fiber's breaking strength.

[0023] Furthermore, this invention unexpectedly discovered that Artemisia argyi extract can effectively improve the mechanical properties of regenerated cellulose fibers and enhance their heat dissipation properties. The presumed reason is that under extraction conditions of pH 10-13, the purified Artemisia argyi extract yields a class of flavonoids with at least one complete large π bond in its structure, exhibiting excellent hyperlocalization. Carbon nanotubes also contain a large range of delocalized π bonds. During the double diffusion process, the Artemisia argyi extract and carbon nanotubes form an effective π-π conjugation effect, and the extract forms hydrogen bonds with the hydroxyl groups on cellulose, improving the dispersion and compatibility between carbon nanotubes and regenerated cellulose, reducing the inhomogeneity within the fiber, and facilitating the orientation of carbon nanotubes along the fiber axis during subsequent drawing, thus enhancing the lattice heat transfer effect within the fiber and improving its mechanical and heat dissipation properties.

[0024] Furthermore, through repeated experiments, this invention sets specific coagulation bath concentrations and operating temperatures to stably disperse carbon nanotubes within the coagulation bath. During the contact between the spinning stream and the coagulation bath, the carbon nanotubes are fixed to the shallow layer of the regenerated fiber through a double diffusion effect. Compared to conventional pre-spinning injection (where carbon nanotubes are added to the spinning solution), there is no risk of carbon nanotubes clogging the pores during spinning, which is beneficial for long-term spinning stability. Moreover, pre-spinning injected carbon nanotubes are mainly distributed within the fiber; compared to this, fibers with shallowly fixed carbon nanotubes exhibit superior heat dissipation performance.

[0025] Finally, this invention uses ionic liquids as solvents in both the artemisia extract and spinning processes, which accelerates the dissolution of the artemisia extract, lowers the extraction temperature, and shortens the extraction time. Compared with traditional spinning processes, ionic liquids are green and recyclable solvents, dissolving cellulose more thoroughly and reducing the use of large amounts of strong acids and alkalis. Therefore, the entire process of this invention is more environmentally friendly and consumes less energy.

[0026] Beneficial effects: Compared with the prior art, the present invention has the following significant advantages:

[0027] (1) By setting reasonable raw material addition ratios and spinning parameters, this invention innovatively disperses carbon nanotubes stably in the coagulation bath, ensuring the stability of long-term spinning; by using Artemisia argyi extract to uniformly disperse carbon nanotubes in regenerated cellulose fibers, the mechanical properties and heat dissipation properties of the fibers are significantly improved.

[0028] (2) The preparation process of this invention is environmentally friendly and low-carbon. The resulting Artemisia argyi regenerated cellulose fiber has good strength, good heat dissipation and strong spinnability, making it very suitable for use in spring and summer fabrics, and further expanding the application of Artemisia argyi in the textile field. Detailed Implementation

[0029] The present invention will now be further described with reference to specific embodiments.

[0030] Example 1: The high-efficiency heat dissipation Artemisia regenerated cellulose fiber of the present invention is prepared by spinning a spinning solution containing Artemisia extract, regenerated cellulose pulp, ionic liquid and solvent, and then treating it in a coagulation bath containing carbon nanotubes of different diameters, dispersant, deionized water and solvent.

[0031] The preparation method of the above-mentioned Artemisia argyi regenerated cellulose fiber includes the following steps:

[0032] (1) Take 100g of dried and cleaned Artemisia argyi powder and add it to 10L of extract of 0.1mol / L [Bmpy]Cl and ethanol. Adjust the pH of the system to 10, sonicate for 60min, sonicate power 500W, sonicate temperature 30℃, and separate Artemisia argyi extract by FL-1 macroporous resin column chromatography.

[0033] Take 25g of [Bmpy]Cl and 75g of DMSO to obtain 100g of spinning solvent. Add 0.08g of Artemisia argyi extract and 8g of bamboo pulp (degree of polymerization 430, methyl cellulose content 92%) to the above spinning solvent and stir continuously at 60℃ for 1h until completely dissolved to obtain spinning solution.

[0034] (2) Take 0.016g of small-diameter carbon nanotubes with a diameter of 0.5nm, 0.064g of large-diameter carbon nanotubes with a diameter of 10nm and 0.008g of TNNDIS from Zhongke Times Nano, stir evenly in 8mL of DMSO and then ultrasonically disperse. The ultrasonic time is 30min, the ultrasonic power is 2000W, the stirring speed is 1000r / min, and the mixture is diluted with 72mL of deionized water to obtain a coagulation bath.

[0035] (3) After the spinning solution is filtered and degassed, it is spun, regenerated in the coagulation bath, washed and stretched, and finally post-treated. The working temperature of the coagulation bath is 30℃, and the rest is carried out according to the conventional process to obtain a high-efficiency heat dissipation Artemisia regenerated cellulose fiber with a specification of 1.33dtex*38mm.

[0036] Example 2: The high-efficiency heat dissipation Artemisia regenerated cellulose fiber of the present invention is prepared by spinning a spinning solution containing Artemisia extract, regenerated cellulose pulp, ionic liquid and solvent, and then treating it in a coagulation bath containing carbon nanotubes of different diameters, dispersant, deionized water and solvent.

[0037] The preparation method of the above-mentioned Artemisia argyi regenerated cellulose fiber includes the following steps:

[0038] (1) Take 100g of dried and cleaned Artemisia argyi powder and add it to 5L of 1.0mol / L [Bmim]Cl / ethanol extract. Adjust the pH of the system to 13, sonicate for 120min, sonicate power 2000W, sonicate temperature 60℃, and separate Artemisia argyi extract by FL-1 macroporous resin column chromatography.

[0039] Take 40g of [Bmim]Cl and 60g of DMF to obtain 100g of spinning solvent. Add 1.5g of Artemisia argyi extract and 15g of wood pulp (degree of polymerization 520, methyl cellulose content 93%) to the above spinning solvent and stir continuously at 80℃ for 2h until completely dissolved to obtain spinning solution.

[0040] (2) Take 0.075g of small-diameter carbon nanotubes with a diameter of 2nm, 0.675g of large-diameter carbon nanotubes with a diameter of 50nm and 0.15g of TNNDIS from Zhongke Times Nano, stir evenly in 60mL of DMSO and then ultrasonically disperse. The ultrasonic time is 60min, the ultrasonic power is 5000W, the stirring speed is 1500r / min, and the mixture is diluted with 90mL of deionized water to obtain a coagulation bath.

[0041] (3) After the spinning solution is filtered and degassed, it is spun, regenerated in the coagulation bath, washed and stretched, and finally post-treated. The working temperature of the coagulation bath is 50℃, and the rest is carried out according to the conventional process to obtain a high-efficiency heat dissipation Artemisia regenerated cellulose fiber with a specification of 1.33dtex*38mm.

[0042] Example 3: The high-efficiency heat dissipation Artemisia regenerated cellulose fiber of the present invention is prepared by spinning a spinning solution containing Artemisia extract, regenerated cellulose pulp, ionic liquid and solvent, and then treating it in a coagulation bath containing carbon nanotubes of different diameters, dispersant, deionized water and solvent.

[0043] The preparation method of the above-mentioned Artemisia argyi regenerated cellulose fiber includes the following steps:

[0044] (1) Take 100g of dried and cleaned Artemisia argyi powder and add it to 7L of 0.5mol / L [Amim]Cl / ethanol extract. Adjust the pH of the system to 11, sonicate for 100min, sonicate power 1200W, sonicate temperature 40℃, and separate Artemisia argyi extract by FL-1 macroporous resin column chromatography.

[0045] Take 40g of [Amim]Cl and 60g of DMAC and mix them to obtain 100g of spinning solvent. Add 0.5g of Artemisia argyi extract and 10g of cotton pulp (degree of polymerization 900, methyl cellulose content 95%) to the above spinning solvent and stir continuously at 70℃ for 1.5h until completely dissolved to obtain spinning solution.

[0046] (2) Take 0.05g of small-diameter carbon nanotubes with a diameter of 1nm, 0.25g of large-diameter carbon nanotubes with a diameter of 30nm and 0.045g of TNNDIS from Zhongke Times Nano, stir evenly in 20mL of DMSO and then ultrasonically disperse. The ultrasonic time is 60min, the ultrasonic power is 5000W, the stirring speed is 1500r / min, and the mixture is diluted with 80mL of deionized water to obtain a coagulation bath.

[0047] (3) After the spinning solution is filtered and defoamed, it is spun, regenerated in the coagulation bath, washed and stretched, and finally post-treated. The working temperature of the coagulation bath is 40℃, and the rest is carried out according to the conventional process to obtain a high-efficiency heat dissipation Artemisia argyi regenerated cellulose fiber with a specification of 1.33dtex*38mm.

[0048] Example 4: The high-efficiency heat dissipation Artemisia regenerated cellulose fiber of the present invention is prepared by spinning a spinning solution containing Artemisia extract, regenerated cellulose pulp, ionic liquid and solvent, and then treating it in a coagulation bath containing carbon nanotubes of different diameters, dispersant, deionized water and solvent.

[0049] The preparation method of the above-mentioned Artemisia argyi regenerated cellulose fiber includes the following steps:

[0050] (1) Take 100 kg of dried and cleaned Artemisia argyi powder and add it to 10000 L of 0.1 mol / L [Bmpy]Cl / ethanol extract. Adjust the pH of the system to 10, sonicate for 60 min, sonicate power 500 W, sonicate temperature 30 °C, and separate Artemisia argyi extract by FL-1 macroporous resin column chromatography.

[0051] Take 250 kg of [Bmpy]Cl and 750 kg of DMSO to obtain 1000 kg of spinning solvent. Add 0.8 kg of Artemisia argyi extract and 80 kg of bamboo pulp (degree of polymerization 430, methyl cellulose content 92%) to the above spinning solvent and stir continuously at 60°C for 1 h until completely dissolved to obtain regenerated cellulose spinning solution.

[0052] (2) Take 0.16 kg of small-diameter carbon nanotubes with a diameter of 0.5 nm, 0.64 kg of large-diameter carbon nanotubes with a diameter of 10 nm and 0.08 kg of TNNDIS from Zhongke Times Nano, stir them evenly in 80 LDMSO, and then disperse them by ultrasonication for 30 min, ultrasonic power of 2000 W, stirring speed of 1000 r / min, and dilute with 720 L of deionized water to obtain a coagulation bath;

[0053] (3) After the spinning solution is filtered and defoamed, it is spun, regenerated in the coagulation bath, washed and stretched, and finally post-treated. The working temperature of the coagulation bath is 20℃, and the rest is carried out according to the conventional process to obtain a high-efficiency heat dissipation Artemisia regenerated cellulose fiber with a specification of 1.33dtex*38mm.

[0054] Comparative Example 1: The difference from Example 1 is that in step (1), the extraction pH of Artemisia argyi extract is 5, and the purification method is column chromatography separation using D001 cation exchange resin.

[0055] Comparative Example 2: The difference from Example 1 is that in step (1), the extraction pH of Artemisia argyi extract is 7, and the purification method is column chromatography separation using DE52 cellulose ion exchange resin.

[0056] Comparative Example 3: The difference from Example 1 is that in step (1), the mass of Artemisia argyi extract in the spinning solution is 0.05g.

[0057] Comparative Example 4: The difference from Example 1 is that in step (1), the mass of Artemisia argyi extract in the spinning solution is 1.0g.

[0058] Comparative Example 5: The difference from Example 1 is that in step (2), the mass of small-diameter carbon nanotubes in the coagulation bath is 0.01g and the mass of large-diameter carbon nanotubes is 0.04g.

[0059] Comparative Example 6: The difference from Example 1 is that in step (2), the mass of small-diameter carbon nanotubes in the coagulation bath is 0.1g and the mass of large-diameter carbon nanotubes is 0.4g.

[0060] Comparative Example 7: The difference from Example 1 is that in step (2), the mass of small-diameter carbon nanotubes in the coagulation bath is 0.02g and the mass of large-diameter carbon nanotubes is 0.06g.

[0061] Comparative Example 8: The difference from Example 1 is that in step (2), the mass of small-diameter carbon nanotubes in the coagulation bath is 0.007g and the mass of large-diameter carbon nanotubes is 0.073g.

[0062] Comparative Example 9: The difference from Example 1 is that in step (3), the working temperature of the coagulation bath is 25°C.

[0063] Comparative Example 10: The difference from Example 1 is that in step (3), the working temperature of the coagulation bath is 55°C.

[0064] Comparative Example 11: The difference from Example 1 is that the coagulation bath consisted of 40 mL DMSO and 40 mL deionized water.

[0065] Comparative Example 12: The difference from Example 1 is that the coagulation bath consisted of 6 mL DMSO and 74 mL deionized water.

[0066] Comparative Example 13: The difference from Example 4 is that carbon nanotubes of different diameters are stably dispersed in the solvent of the spinning solution for spinning.

[0067] The tensile strength of the fibers was tested according to GB / T 14337-2008 "Test Method for Tensile Properties of Short Chemical Fibers". The axial thermal conductivity of the fibers was tested according to ASTM D7984-2016 "Standard Test Method for Measuring the Thermal Energy Storage Coefficient of Fabrics Using Modified Transient Planar Source (MTPS) Instrument". The fibers of this invention were spun, woven, dyed and finished to obtain fabrics with specifications of (regenerated cellulose / cotton 70 / 30)40S*(regenerated cellulose / cotton 70 / 30)40S / 133*72. The contact cooling coefficient of the fabric was tested according to GB / T 35263-2017 "Detection and Evaluation of Instantaneous Cooling Properties of Textiles". The performance test results of the fibers and fabrics prepared in Examples 1-4 and Comparative Examples 1-13 are shown in Table 1.

[0068] As shown in Table 1, in Examples 1-3, carbon nanotubes were uniformly dispersed in the coagulation bath. With the help of Artemisia argyi extract, they formed good compatibility with the fibers, exhibiting heterogeneous nucleation and improving fiber crystallinity. Simultaneously, they formed complete and dense thermally conductive channels within the fibers, significantly enhancing tensile strength and thermal conductivity compared to ordinary fibers. The resulting fabric also showed a marked improvement in cooling properties. Within the carbon nanotube content range of 1-5%, as the carbon nanotube content increased, the fiber's heat dissipation enhanced, and the fabric's cooling sensation became more pronounced. In Example 4, the fiber's performance remained stable during mass production.

[0069] Comparative Example 1: Artemisia argyi extract is mainly composed of alkaloids containing pyridine rings. Such substances are π-deficient heterocyclic compounds and cannot form an effective π-π conjugation effect with carbon nanotubes.

[0070] Comparative Example 2 shows that Artemisia argyi extract is mainly a type of polysaccharide with a structure similar to cellulose, which cannot improve the dispersibility of carbon nanotubes in the fiber. In Comparative Examples 1 and 2, the poor dispersibility and compatibility of carbon nanotubes inside the fiber disrupted the lattice thermal conductivity effect and failed to form an effective thermal conduction channel. Compared with unmodified fiber, the strength decreased and the improvement in heat dissipation was not significant.

[0071] Comparative Example 3 shows that the fiber contains less Artemisia argyi extract, the dispersion and compatibility of carbon nanotubes within the fiber decrease, the lattice heat transfer effect weakens, and the fiber strength and heat dissipation both decrease.

[0072] Comparative Example 4: Further increasing the content of Artemisia argyi extract in the fiber did not improve the fiber strength or heat dissipation.

[0073] Comparative Example 5: The carbon nanotube content in the fiber is relatively low, and the heat conduction channels formed by the carbon nanotubes in the fiber are not complete and dense enough. Compared with Example 1, the heat dissipation performance is reduced.

[0074] Comparative Example 6 has a higher content of carbon nanotubes in its fibers, and the carbon nanotubes are partially aggregated inside the fibers. Compared with Example 1, the fiber strength and heat dissipation are reduced.

[0075] Comparative Example 7 shows a higher proportion of small-diameter carbon nanotubes, which are easily completely encapsulated by the regenerated cellulose substrate during the dual diffusion process, making it impossible to form a complete and interconnected heat conduction channel.

[0076] In Comparative Example 8, the higher proportion of large-diameter carbon nanotubes allowed for the formation of more initial heat conduction channels. However, the low content of small-diameter carbon nanotubes prevented these initial heat conduction channels from interconnecting, resulting in a lack of a dense heat conduction network. Compared to Example 1, the fiber's heat dissipation performance was unsatisfactory.

[0077] Comparative Example 9 had a low coagulation bath temperature, and Comparative Example 11 had a low coagulation bath water content. Although this ensured excellent dispersion of carbon nanotubes in the coagulation bath, the double diffusion rate was slow during fiber regeneration, resulting in insufficient fiber coagulation. The fibers broke due to slippage during stretching, leading to decreased spinning stability.

[0078] Comparative Example 10 had a higher coagulation bath temperature, while Comparative Example 12 had more water in the coagulation bath. The double diffusion rate was accelerated during fiber regeneration, the fiber coagulated fully, and the spinning performance was stable. However, the dispersion of carbon nanotubes in the coagulation bath deteriorated, and the fiber strength and heat dissipation both decreased.

[0079] Comparative Example 13 uses a pre-spinning injection method, where carbon nanotubes are mainly distributed inside the fiber. In contrast, in Example 4, carbon nanotubes are fixed in the shallow layer of the fiber, giving it a greater advantage in heat dissipation. As spinning time increases, the carbon nanotube content in the fiber stream entering the coagulation bath in Comparative Example 13 decreases, and in severe cases, spinneret clogging occurs, leading to a significant increase in fiber breakage rate, making it unsuitable for large-scale, long-term production.

[0080] Table 1 Performance test results of fibers and fabrics prepared in Examples 1-4 and Comparative Examples 1-13

[0081]

Claims

1. A highly efficient heat-dissipating regenerated cellulose fiber from Artemisia argyi, characterized in that, The regenerated cellulose fiber from Artemisia argyi is prepared by spinning a spinning solution containing flavonoid-containing plant extracts, regenerated cellulose pulp, ionic liquid, and solvent, followed by treatment in a coagulation bath containing carbon nanotubes of different diameters, a dispersant, and a solvent. The flavonoid-containing plant extract is Artemisia argyi extract. The preparation method of the Artemisia argyi extract is as follows: Artemisia argyi is pulverized, added to an extract containing ionic liquid and ethanol, the pH of the system is adjusted, ultrasonically vibrated, and purified and separated to obtain the fiber. The pH is 10-13. The carbon nanotubes of different diameters include large-diameter carbon nanotubes with a diameter of 10-50 nm and small-diameter carbon nanotubes with a diameter of 0.5-2 nm, with a mass ratio of large-diameter carbon nanotubes to small-diameter carbon nanotubes of 4-9:

1. The total mass of carbon nanotubes of different diameters is in the mass ratio of the regenerated cellulose pulp to 1:20-100.

2. The Artemisia argyi regenerated cellulose fiber according to claim 1, characterized in that, In the spinning solution, the mass ratio of Artemisia argyi extract to regenerated cellulose pulp is 1:10-100, and the mass of regenerated cellulose pulp accounts for 8-15% of the total mass of ionic liquid and solvent.

3. The Artemisia argyi regenerated cellulose fiber according to claim 1, characterized in that, The ionic liquid is one of 3-methyl-N-butylchloropyridine, 1-butyl-3-methylimidazolium chloride, 1-allyl-3-methylimidazolium chloride, or 1-ethyl-3-methylimidazolium acetate; the solvent is one of DMSO, DMF, DMAC, or DMI.

4. A method for preparing the highly efficient heat-dissipating regenerated cellulose fiber from Artemisia argyi as described in claim 1, characterized in that, Includes the following steps: (1) Dissolve Artemisia argyi extract and regenerated cellulose pulp in ionic liquid and solvent, and mix evenly to obtain spinning solution; (2) Disperse carbon nanotubes of different diameters in a solvent containing a dispersant to obtain a coagulation bath; (3) The spinning solution is filtered and defoamed before spinning, regenerated in a coagulation bath, washed and stretched, and finally post-treated to obtain high-efficiency heat dissipation Artemisia regenerated cellulose fiber.

5. The preparation method according to claim 4, characterized in that, In step (1), the dissolution temperature of the spinning solution is 60-80℃ and the dissolution time is 1-2h.

6. The preparation method according to claim 4, characterized in that, In step (3), the working temperature of the coagulation bath is 30-50℃.

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