Preparation method of light-absorbing nano-polyacrylonitrile corduroy

Abstract

The application discloses a preparation method of light-absorbing nano polyacrylonitrile corduroy, and belongs to the technical field of corduroy production, which comprises seven steps of solution preparation, electrostatic spinning, nano twisting, air-jet weaving, laser cutting, near-infrared finishing and heat setting. The corduroy prepared by the method has the properties of being stronger, easier to remove stains and waterproof, can absorb heat and keep warm in a wider wavelength range, and the laser cutting makes the friction smaller and the efficiency higher.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of corduroy production, and in particular to a preparation method of light-absorbing nanometer polyacrylonitrile corduroy. BACKGROUND

[0002] The corduroy is also called rush cord or strip cord, is a cotton fabric with longitudinal cord strips formed on the surface by cutting weft pile, and is widely applied to clothes and furniture. The raw material of the corduroy is generally mainly cotton, terylene, polyacrylonitrile fiber or spandex. The process flow of the corduroy is: alkali rolling, pile cutting, desizing, drying, pile brushing, singeing, scouring and bleaching. The multifunctional electrospinning device disclosed in patent CN201520087013.7 has only one spinneret, the fiber sprayed out is too thin, and the fabric strength is poor; the pile cutting device and the pile cutting method disclosed in patent CN202011490296.1, the textile pile cutting device disclosed in patent CN202021048583.2 and the pile cutting device disclosed in patent CN201921595589.9 all cut piles by means of cutting knives, the precision is not high, and there is friction between the cutting knives and the fabric, thereby reducing the pile cutting efficiency; the polyacrylonitrile fiber disclosed in patent CN201910120658.9, the preparation method and the preparation method of carbon fiber thereof need to be heated in the heat setting process, the preparation process is not closely connected before and after the preparation process, and the efficiency is relatively low; the far-infrared radiation heating fabric and the preparation method thereof disclosed in patent CN201910784002.7 have the far-infrared heating performance, but the wavelength range is single, the near-infrared range is not included, and the light absorption capacity is insufficient; the negative ion-far infrared antibacterial fabric and the textile process thereof disclosed in patent CN202110613782.6 directly coat the far-infrared material on the surface of the fabric, the far-infrared material is lost in the subsequent steps, and the raw material is wasted and the far-infrared performance is reduced. SUMMARY

[0003] To solve the above problems, the application provides a preparation method of light-absorbing nanometer polyacrylonitrile corduroy.

[0004] The technical problem to be solved by the application can be solved by the following technical scheme.

[0005] A preparation method of light-absorbing nanometer polyacrylonitrile corduroy, comprising the following steps:

[0006] S1 solution preparation, first, single-layer graphene oxide nanoparticles are added to an organic solvent dimethylformamide DMF, ultrasonic dispersion is uniform, a DMF dispersion liquid of graphene oxide is obtained, then polyacrylonitrile PAN is added to the DMF dispersion liquid of graphene oxide, mechanical stirring is carried out at 60 DEG C, until a uniform composite dispersion system is formed, and the system is left to stand and defoamed to obtain a spinning solution, wherein the total concentration of the polyacrylonitrile is 10%-45%;

[0007] S2 electrospinning, the spinning solution obtained in S1 is delivered into each spinneret, electrospinning is started, three nanofiber bundles are formed by spraying from three spinnerets, the three spinnerets are connected in an equilateral triangle, the distance is 10-15 cm, and the receiving distance is 10-15 cm, the inner diameter of the spinneret needle hole of the spinneret is 0.6 mm, and the outer diameter is 0.9 mm;

[0008] S3 nanometer twisting, the three nanofiber bundles obtained in S2 are twisted at the nanometer level in a copper funnel, and are wound to form polyacrylonitrile nanofiber yarn, the rotating speed is 150 r / min, and the twisting coefficient is in the range of 60-70;

[0009] S4 air-jet weaving, the polyacrylonitrile nanofiber yarn obtained in S3 is woven to form a polyacrylonitrile fabric at the nanometer level;

[0010] S5 laser cutting, a laser cutting device is used to cut the fabric by means of ultraviolet light, and then nitrogen is used to blow the fabric to remove impurities, the power of the laser is 50 W, the cutting speed is 5 m / min, the light intensity is 20%, the wavelength of the ultraviolet light is 355 nm, the temperature is 320℃, the flow rate of the nitrogen is 750 ml / min, and the distance between the laser head and the fabric is 25-35 cm;

[0011] S6 near-infrared finishing, a nozzle is used to dissolve nano-ATO particles with a particle size of 20 nm in water, the near-infrared wavelength absorbed by the nano-ATO particles is in the range of 780-900 nm, the content of the nano-ATO particles in the water is 30%, the nano-ATO particle solution is sprayed on the surface of the fabric from the nozzle, at the same time, the water volatilizes at a high temperature remaining on the surface of the fabric after laser cutting, and the fabric is cooled to prevent yellowing of the fabric;

[0012] S7 heat setting, the fabric is kept at a temperature of 145℃-155℃ for 25-30 s, and then cooled.

[0013] In the above technical solution, preferably, the single-layer graphene oxide particle has a size of 500 nm-5 μm in flake diameter and a thickness of 0.6-1.0 nm in flake diameter, and absorbs a far-infrared wavelength in the range of 8-12 μm, and the concentration of the single-layer graphene oxide particle in the spinning solution is 0.5-1 wt.%.

[0014] In the above technical solution, preferably, the stirring temperature in S1 is 50-70℃, and the stirring is performed until the solution becomes uniform, and the time is 18-36 h.

[0015] In the above technical scheme, preferably, the size of the spray head in S6 is 15 inches, eight spray heads work side by side at the same time, the speed of spraying the nano antimony tin oxide ATO solution is 2-3 L / min, the distance between the spray head and the cloth is 40 cm, the size of the spray hole is 5 mm, and the temperature of the sprayed mixture of water and antimony tin oxide is 20 DEG C, so that the fabric is rapidly cooled to 145 DEG C.

[0016] In the above technical scheme, preferably, the cooling temperature in S7 is 50 DEG C, and the cooling time is 3-4 h.

[0017] The technical scheme of the present application has the following advantages compared with the prior art:

[0018] The present application organically combines laser cutting pile with near-infrared finishing, and the high temperature of the fabric surface after laser cutting pile is conducive to the combination of the near-infrared material antimony tin oxide and the fabric, and the water sprayed from the spray head evaporates and reduces the temperature of the fabric surface, reducing the yellowing of the fabric.

[0019] The far-infrared single-layer graphene oxide and the near-infrared nano antimony tin oxide particles used in the present application have a large size difference, the large-particle graphene oxide is put into the spinning solution and in-situ polymerized with polyacrylonitrile to obtain the far-infrared effect simply and quickly, so a larger spinneret hole is designed; the small-particle nano antimony tin oxide is mixed with water to form an ATO solution which is sprayed on the fabric surface, and due to the small particle size, it can be more closely attached to the fabric surface; in addition, the present application uses far-infrared and near-infrared light-absorbing materials, which can absorb heat and keep warm in a wider wavelength range.

[0020] The fiber in the present application is a nanofiber, and the cutting knife of the ordinary cutting pile device cannot achieve fine nanofiber cutting pile, and the laser cutting pile can effectively control the cutting pile of the nanofiber by changing the temperature, and the laser cutting pile has almost no friction compared with the ordinary cutting knife cutting pile, and has higher efficiency.

[0021] The present application uses nanoscale fibers, so compared with traditional ordinary fiber corduroy, it has the performance of easy to remove stains and waterproof.

[0022] The electrospinning spinneret in the present application is three and the included angle between two of them is 120 DEG, so on the one hand the spinneret connecting line forms an equilateral triangle to make the structure more stable, and on the other hand the fibers processed by the three spinnerets make the fibers more tough. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is the whole flowchart of the present application of light-absorbing nano polyacrylonitrile corduroy and its preparation method.

[0024] Figure 2 It is the distribution structure diagram of the electrospinning spinneret of the present application.

[0025] Figure 3 It is a schematic diagram of the structure of the electrospinning head and twisting of the present invention.

[0026] Figure 4 It is a structural schematic diagram of the laser pile cutting machine head of the present invention.

[0027] Figure 5 It is a schematic structural diagram of the near-infrared finishing device of the present invention.

[0028] Explanation of the accompanying symbols: 1-solution preparation, 2-electrospinning, 3-nano twisting, 4-air-jet weaving, 5-laser cutting, 6-near-infrared finishing, 7-heat setting, 8-spinneret, 9-copper funnel, 10-nano yarn, 11-hair, 12-slider, 13-slide rod, 14-laser cutting knife, 15-nozzle, 16-water outlet, 17-slider, 18-slide rod. DETAILED DESCRIPTION

[0029] The present invention will be further described below with reference to the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it. However, the embodiments are not intended to limit the present invention.

[0030] The light-absorbing nano polyacrylonitrile corduroy and its preparation method are produced by the present invention. The preparation process is as follows: Figure 1 As shown, it includes solution preparation 1, electrospinning 2, nano twisting 3, air-jet weaving 4, laser cutting 5, near-infrared finishing 6 and heat setting 7.

[0031] The polyacrylonitrile particles and the far-infrared material single-layer graphene oxide particles in the spinning solution are dissolved in an organic solvent in a certain proportion, and the solution is loaded into the injection spinneret 8.

[0032] like Figure 2 and Figure 3 As shown, the electrospinning machine has three spinnerets 8, which spray nanofibers onto a copper funnel 9. The copper funnel rotates at a speed of 150 r / min, and an insulating rod is used to pull the nanofibers into a cone shape. As the copper funnel rotates, the fibers rotate and undergo nano-twisting 3 to produce nano-yarn 10.

[0033] like Figure 4 As shown, the laser cutting knife 14 in the laser pile cutting 5 cuts the fabric by sliding the slider 12 on the slide rod 13, so that pile 11 is generated on the fabric.

[0034] like Figure 5As shown, the nozzle 15 in the near-infrared finishing 6 has several water outlets 16. The nozzle 15 can also be moved back and forth on the slide bar 18 via the slider 17. Antimony tin oxide particles are smaller than graphene oxide particles and are more easily attached to the fabric surface. However, graphene oxide particles are larger and are not suitable for spraying onto the fabric surface. In addition, another reason for the latter addition of tin oxide is that if antimony tin oxide is placed in the spinning solution at the beginning, it would require a more complex precursor and calcination and other steps, making the production process more complicated. In addition, the near-infrared material antimony tin oxide is sprayed because its smaller particles can better adhere to the fabric surface. If it is added at the beginning, the preparation method will be more complicated. In addition, the adhesion of the far-infrared material is achieved by utilizing the residual heat of the laser cutting process, which allows the cutting and finishing to be completed in a coherent manner, making it more efficient.

[0035] In heat setting 7, due to the heating of laser cutting and appropriate cooling during the near-infrared finishing process in the early steps, the heat setting process does not require an additional heating step and directly performs cooling, which makes the steps simpler and improves efficiency. In addition, near-infrared finishing is performed immediately after laser cutting. The two steps are closely related, ensuring the beauty of the fabric without causing it to turn yellow, and making it easier to perform near-infrared finishing.

[0036] In the following examples and comparative examples, the experimental methods used are conventional methods unless otherwise specified, and the materials, reagents, etc. used are all commercially available unless otherwise specified.

[0037] Polyacrylonitrile powder was purchased from Shanghai Weisida Plastics Co., Ltd. with specifications (density of 1.14-1.45 g / cm3, number average molecular weight of about 30,000, and weight average molecular weight of about 90,000); single-layer graphene oxide particles were purchased from Shenzhen Turing Evolution Technology Co., Ltd. with specifications (carbon content of 42-46 wt.%, oxygen content of 48-56 wt.%); dimethylformamide was purchased from Shandong Mingcheng New Materials Co., Ltd. with specifications (density of 1.01 g / cm3, content of 99%); nano-antimony tin oxide ATO powder was purchased from Hangzhou Zheming New Materials Co., Ltd. with specifications (model ZM-A20S, particle size of 20 nm, specific surface area of ​​40-70 m2 / g); polyacrylate was purchased from Jinan Xinsenyuan Chemical Co., Ltd. with specifications (viscosity of 20000S, content greater than or equal to 99.99%).

[0038] Example 1

[0039] A light-absorbing nano-polyacrylonitrile corduroy and a preparation method thereof, specifically comprising the following steps:

[0040] S1, single-layer graphene oxide nanoparticles are added to an organic solvent dimethylformamide DMF, wherein the total concentration of polyacrylonitrile in the spinning solution is 30%, and the single-layer graphene oxide is uniformly dispersed by ultrasonic dispersion to obtain a DMF dispersion solution of the graphene oxide, then polyacrylonitrile PAN is added to the DMF dispersion solution of the graphene oxide, wherein the amount of the single-layer graphene oxide is 1wt.%, and mechanical stirring is carried out at a temperature of 60℃ until complete dissolution, and the spinning solution is obtained by standing and defoaming, and the standing time is 20h;

[0041] S2, the obtained spinning solution is transported to each spinneret, and electrospinning is started, and three nanofiber bundles are formed by spraying from the spinnerets arranged in an equilateral triangle with a distance of 13cm under the conditions of a voltage of 18kV and a receiving distance of 13cm;

[0042] S3, the obtained three nanofiber bundles are subjected to nanoscale twisting in a copper funnel device, and are wound into a shape with the rotation of the funnel at a speed of 150r / min to obtain a polyacrylonitrile nanofiber yarn, wherein the yarn diameter is 4μm, and the single-fiber diameter is 400nm;

[0043] S4, the obtained polyacrylonitrile nanofiber yarn is made into a nanoscale polyacrylonitrile cloth;

[0044] S5, a laser cutting device with an output power of 8W is used to cut the fabric by means of laser light with a wavelength of 355nm ultraviolet light, the laser cutting rate is 5m / min, the laser cutting temperature is 320℃, the distance between the laser head and the fabric is 25cm, and then the fabric is subjected to nitrogen blowing treatment;

[0045] S6, a nano-tin antimony oxide aqueous solution is sprayed onto the surface of the fabric from a 15-inch nozzle at a speed of 2L / min by means of a nozzle, wherein the content of the nano-tin antimony oxide in water is 30%, and at the same time, the water will evaporate due to the high temperature remaining on the surface of the fabric after laser cutting, and the fabric is cooled to prevent the fabric from yellowing;

[0046] S7, the fabric is heated at a temperature of 145-155℃ (i.e. the temperature of the fabric after cooling) for 20-25s, and then the fabric is cooled at a temperature of 50℃ for 3h.

[0047] Example 2

[0048] The difference from Example 1 is that S1: single-layer graphene oxide nanoparticles are added to the organic solvent dimethylformamide DMF, wherein the total concentration of polyacrylonitrile in the spinning solution is 30%, and ultrasonic dispersion is uniformly performed to obtain a DMF dispersion of graphene oxide, and then polyacrylonitrile PAN is added to the DMF dispersion of graphene oxide, wherein the amount of single-layer graphene oxide is 0.5wt.%, and mechanical stirring is performed at a temperature of 60°C until completely dissolved, and the mixture is allowed to stand for degassing to obtain a spinning solution, and the standing time is 20 hours.

[0049] Example 3

[0050] The difference from Example 1 is that S6: using a nozzle, a nano-tin antimony oxide aqueous solution flows out from a 15-inch nozzle and is sprayed on the fabric surface at a rate of 2 L / min, wherein the content of nano-tin antimony oxide in water is 20%. At the same time, the water will evaporate due to the high temperature remaining on the fabric surface after laser cutting, and at the same time, the fabric will be cooled to prevent the fabric from yellowing.

[0051] Comparative Example 1

[0052] The steps are basically the same as those in Example 1, except that no single-layer graphene oxide particles are added;

[0053] Comparative Example 2

[0054] The steps are basically the same as those in Example 1, except that nano-tin antimony oxide powder is not added;

[0055] Comparative Example 3

[0056] The steps are basically the same as those in Example 1, except that the single-layer graphene oxide particles and nano-antimony tin oxide powder are not added;

[0057] Comparative Example 4

[0058] The steps are basically the same as those in Example 1, except that, in the laser cutting process, the distance between the laser head and the fabric is 15 cm.

[0059] Comparative Example 5

[0060] The steps are basically the same as those in Example 1, except that the polyacrylonitrile is not subjected to nano-processing such as electrospinning, but only to ordinary corduroy processing;

[0061] Comparative Example 6

[0062] The steps are basically the same as those in Example 1, except that a common knife-cutting machine is used for cutting the pile, and the temperature is raised to 145° C. during subsequent heat setting.

[0063] Test Example 1

[0064] The above examples and comparative examples were tested according to the far-infrared performance test index FZ / T64010-2000 "Far-infrared textile". Table 1 is the performance test results.

[0065] Table 1

[0066] Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Comparative Example 3 Far infrared normal emissivity 89% 83% 87% 72% 86% 72% Temperature rise (after light source irradiation for 10 min) / °C 9.3 5.8 6.0 3.3 3.5 0.2

[0067] The results of Table 1 show that the far-infrared performance of the light-absorbing nano-polyacrylonitrile corduroy prepared in Example 1 is the best, because the amount of far-infrared particles graphene oxide added is the most appropriate, and the amount of near-infrared particles nano-antimony tin oxide added is also the most appropriate, and the near-infrared performance is also very excellent, so the temperature rise is the highest.

[0068] The far-infrared performance of the light-absorbing nano-polyacrylonitrile corduroy prepared in Example 2 is general, because the amount of far-infrared particles graphene oxide added is less, but the amount of near-infrared particles nano-antimony tin oxide added is appropriate, and the near-infrared absorption performance is good, so the temperature rise is higher.

[0069] The far-infrared performance of the light-absorbing nano-polyacrylonitrile corduroy prepared in Example 3 is strong, because the amount of far-infrared particles graphene oxide added is appropriate, but the amount of near-infrared particles nano-antimony tin oxide added is less, and the near-infrared absorption performance is general, so the temperature rise is higher but not the highest.

[0070] The light-absorbing nano-polyacrylonitrile corduroy prepared in Comparative Example 1 has no far-infrared particles graphene oxide added, but it has an appropriate amount of near-infrared material nano-antimony tin oxide powder added, so the far-infrared performance is poor, the near-infrared performance is good, and the temperature rise is only a little.

[0071] The light-absorbing nano-polyacrylonitrile corduroy prepared in Comparative Example 2 has an appropriate amount of far-infrared material graphene oxide added, but no near-infrared material nano-antimony tin oxide powder added, so its far-infrared performance is good, but the near-infrared absorption heat is very little, so the temperature rise is only a little.

[0072] The light-absorbing nano-polyacrylonitrile corduroy prepared in Comparative Example 3 has no far-infrared particles graphene oxide and near-infrared particles nano-antimony tin oxide added, so its far-infrared performance is poor, the near-infrared performance is also poor, and the temperature rise is almost none.

[0073] Test Example 2

[0074] The corduroy prepared in the above Example 1 and Comparative Example 4 was tested for rubbing performance and breaking strength, and the standards are as follows: strength performance test index: GB / T22925-2009 "Nanotechnology treated clothing", pilling test index: GB / T4802.4-2020 "Determination of the pilling behavior of textile fabrics Part 2: modified Martindale method".

[0075] Place the specimen fixture with the felt pad and specimen in the groove at the large end of the auxiliary device, ensuring that the specimen fixture and the auxiliary device fit tightly together. Tighten the specimen fixture ring onto the specimen fixture, ensuring that the specimen and felt pad do not move or deform. Repeat the above steps to install other specimens.

[0076] Place a piece of felt on the pilling table and place the sample on top, with the abrasive surface facing upward. Place a weight on top and secure it with a retaining ring. The performance test results after the experiment are shown in Table 2.

[0077] Table 2

[0078]

[0079] It can be seen from Table 2 that in the preparation method adopted by the present invention, when the distance between the laser head and the fabric is about 25 cm, the fabric has better pilling resistance and is less likely to break or damage.

[0080] The light-absorbing nano-polyacrylonitrile corduroy prepared in Example 1 has the strongest breaking strength and is more resistant to pilling because the distance between the laser cutter and the fabric is the most appropriate when cutting the fabric, and the fabric is more compact.

[0081] The light-absorbing nano-polyacrylonitrile corduroy prepared in Comparative Example 4 had average breaking strength and more fuzz because the laser cutting knife was too close to the fabric during cutting, which made the fabric loose.

[0082] Test Example 3

[0083] The corduroy prepared in Example 1 and Comparative Example 5 was tested for waterproof performance according to the following standard: Waterproof Performance Test Index GB / T22925-2009 "Nanotechnology Processed Clothing". The results are shown in Table 3 (the larger the level, the better the performance).

[0084] Table 3

[0085]

[0086] The light-absorbing nano-polyacrylonitrile corduroy prepared in Example 1 has the advantages of nano-fabric because it has undergone nano-processing methods such as electrospinning, and is more waterproof and stain-resistant.

[0087] It can be seen from Table 3 that the preparation method adopted in the present invention can improve the waterproof and decontamination properties of the corduroy after nano-treatment.

[0088] Test Example 4

[0089] The corduroy prepared in Example 1 and Comparative Example 6 were tested for breaking strength and fabric appearance retention according to the following standards: strength performance test index: GB / T 22925-2009 "Nanotechnology-treated clothing"; fabric appearance retention performance test index: FZ / T81019-2014 "Corduroy clothing". The results are shown in Table 4 (the larger the grade, the better the performance).

[0090] Table 4

[0091] Example 1 Comparative Example 6 Breaking strength / N 382.09 369.13 Fuzz retention performance / grade 4 3 Appearance after washing No breakage, no deformation twist No breakage, slight deformation twist in a small part No breakage, slight deformation twist in a small part

[0092] As can be seen from the data in Table 4, the light-absorbing nano-polyacrylonitrile corduroy prepared in Example 1 has a finer cut pile due to the change from the traditional knife cutting method to laser cutting. The resulting corduroy product has better performance, better breaking strength, and better appearance retention. Therefore, the present invention improves the cutting method to improve the performance of the cut pile product.

[0093] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will appreciate that other variations or modifications can be made based on the above description. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A method for preparing light-absorbing nano-polyacrylonitrile corduroy, characterized in that: The following steps are involved: Preparation of S1 solution: first, add single-layer graphene oxide nanoparticles to the organic solvent dimethylformamide (DMF), and disperse them uniformly by ultrasonication to obtain a DMF dispersion of graphene oxide. Then, add polyacrylonitrile (PAN) to the DMF dispersion of graphene oxide, and mechanically stir at 60°C until a uniform composite dispersion system is formed. The solution is allowed to stand for degassing to obtain a spinning solution, wherein the total mass concentration of polyacrylonitrile is 10%-45%. S2 electrospinning: The spinning solution obtained in S1 is transported to each spinneret to start electrospinning. Nanofiber bundles are ejected from three spinnerets. The three spinnerets are connected in an equilateral triangle with a distance of 10-15 cm. The receiving distance is 10-15 cm. The inner diameter of the spinneret pinhole of the spinneret is 0.6 mm and the outer diameter is 0.9 mm. S3 nano-twisting: the three bundles of nanofibers obtained in S2 are nano-twisted and wound in a copper funnel to obtain polyacrylonitrile nanofiber yarn at a rotation speed of 150 r / min and a twist coefficient range of 60-70; S4 air-jet weaving, weaving the polyacrylonitrile nanofiber yarn obtained in S3 to produce nano-scale polyacrylonitrile cloth; S5 laser velvet cutting uses a laser velvet cutting device to cut the fabric with ultraviolet laser light, and then uses nitrogen to blow the fabric to remove impurities. The laser power is 50W, the cutting speed is 5m / min, the light intensity is 20%, the ultraviolet wavelength is 355nm, the temperature is 320℃, the nitrogen flow rate is 750ml / min, and the distance between the laser head and the fabric is 25-35cm; S6 near-infrared finishing uses a nozzle to dissolve 20nm nano-antimony tin oxide (ATO) particles in water. The nano-antimony tin oxide absorbs near-infrared wavelengths between 780-900nm and its content in water is 30%. The nano-antimony tin oxide solution flows out of the nozzle and is sprayed onto the fabric surface. At the same time, the water remaining on the fabric surface after laser cutting evaporates at high temperatures, cooling the fabric and preventing it from yellowing. S7 heat setting: keep the fabric at a temperature of 145℃-155℃ for 25-30s and then cool it down.

2. The method for preparing the light-absorbing nano-polyacrylonitrile corduroy according to claim 1, characterized in that: The single-layer graphene oxide particles have a sheet size of 500nm-5μm, a sheet thickness of 0.6-1.0nm, and absorb far-infrared wavelengths of 8-12μm. The concentration of the single-layer graphene oxide particles in the spinning solution is 0.5-1wt.%.

3. The method for preparing the light-absorbing nano-polyacrylonitrile corduroy according to claim 1, characterized in that: The stirring temperature in S1 is 50-70°C, and the stirring is carried out until the solution becomes homogeneous, which takes 18-36 hours.

4. The method for preparing the light-absorbing nano-polyacrylonitrile corduroy according to claim 1, characterized in that: The size of the nozzle in S6 is 15 inches. Eight nozzles work simultaneously in pairs side by side. The speed of spraying nano-antimony tin oxide ATO solution is 2-3L / min. The distance between the nozzle and the cloth is 40cm. The nozzle hole size is 5mm. The temperature of the sprayed water and antimony tin oxide mixture is 20℃, which makes the fabric quickly cool down to 145℃.

5. The method for preparing the light-absorbing nano-polyacrylonitrile corduroy according to claim 1, characterized in that: The cooling temperature in S7 is 50° C. and the cooling time is 3-4 h.

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