Colored fiber and preparation method thereof

Abstract

The invention discloses a colored fiber and a preparation method thereof. The colored fiber takes a polymer fiber as a base material, and an inorganic sheet-shaped colored substance or a mixture of the inorganic sheet-shaped colored substance and a dark-color substance is arranged in a manner of being parallel to the axial direction of the fiber and is uniformly embedded into the polymer fiber. The method comprises the following steps: dissolving a polymer in a solvent, mixing with an inorganic flaky colored substance or a mixture of the inorganic flaky colored substance and a dark-color substance to obtain a spinning solution, and pressing the spinning solution into a coagulating bath through a spinning nozzle for coagulating and forming to obtain the colored tow. The fiber provided by the invention has good friction resistance, washing resistance, weather resistance, heat resistance and light stability.

Description

Technical Field

[0001] The present invention relates to a fiber and a preparation method thereof, specifically to a colored fiber and a preparation method thereof, belonging to the technical field of colored fibers. Background Art

[0002] As an important raw material for clothing fabrics, fiber materials play an important and irreplaceable role in the textile and printing and dyeing industries. With the progress of technology, colored fibers have gained popularity among the public due to their bright colors, but there are still some technical problems.

[0003] CN 118422363 A relates to a fluorescent polyurethane elastic fiber and a preparation method thereof. This method uses a triphenylamine-terminated ketone alkyne compound as a reaction raw material, reacts with an amino compound to obtain an intermediate product, and incorporates triethylamine and boron trifluoride diethyl ether therein to undergo a coordination reaction to obtain an N,O-coordinated fluoroboron fluorescent dye; subsequently, the fluorescent dye and the polyurethane masterbatch are dissolved in an organic solvent and heated to remove bubbles to obtain a composite spinning solution; finally, a fluorescent polyurethane elastic fiber is obtained through a wet spinning preparation method. However, the weather resistance, heat resistance, and light stability of the color of the fluorescent polyurethane elastic fiber synthesized by this method are poor.

[0004] CN 111876838 A relates to a polypropylene fiber with high fluorescence emission and a preparation method thereof. This method uniformly mixes polypropylene resin and porous high-fluorescence polyacrylate microspheres, and performs a drying treatment to make a masterbatch. Finally, the masterbatch and polypropylene resin are spun by a melt compound spinning process. This synthesis method has high requirements for the reaction temperature, and the weather resistance, heat resistance, and light stability of the color of the obtained fiber are poor.

[0005] In view of the problems of existing colored fibers, it is necessary to develop a colored fiber with good abrasion resistance, washability, weather resistance, heat resistance, and light stability. Summary of the Invention

[0006] To solve the existing problems, the present invention provides a colored fiber and a preparation method thereof. This material uses a polymer fiber as a substrate, and arranges and uniformly embeds an inorganic flaky colored substance or a mixture thereof with a dark substance parallel to the fiber axis inside the polymer fiber. This method of arranging and uniformly embedding the inorganic flaky colored substance or a mixture thereof with a dark substance parallel to the fiber axis inside the polymer fiber results in a fiber with good weather resistance, heat resistance, and light stability of the color; due to the large specific surface area of the inorganic flaky colored substance and embedding its mixture inside the fiber, the fiber has good abrasion resistance and washability.

[0007] To achieve the above object, the present invention adopts the following technical solutions:

[0008] A colored fiber is based on a polymer fiber, with inorganic flaky colored substances, or a mixture of inorganic flaky colored substances and dark substances arranged in a manner parallel to the fiber axis, and the inorganic flaky colored substances, or the mixture of inorganic flaky colored substances and dark substances, are uniformly embedded inside the polymer fiber.

[0009] Furthermore, the polymer fiber includes chemical fibers and natural fibers. Chemical fibers include regenerated fibers and synthetic fibers. The regenerated fibers include one or more of soybean fiber, cotton fiber, viscose fiber, modal fiber, and bamboo pulp fiber; the synthetic fibers include one or more of aromatic polyamide fiber, polyester fiber, polyamide fiber, polyacrylonitrile fiber, polyether fiber, polyurethane fiber, polypropylene fiber, polyvinyl chloride fiber, polyvinyl alcohol fiber, polyvinyl acetal fiber, polyoxymethylene fiber, polyether ether ketone fiber, cuprammonium fiber, seaweed fiber, chitosan fiber, chitin fiber, cellulose acetate fiber, and phosphorus-modified phenolic fiber; the natural fibers include animal fibers and plant fibers. The animal fibers include one or more of wool and silk, and the plant fibers include one or more of cotton, hemp, and avicell fiber.

[0010] Furthermore, the inorganic flaky colored substance is a flaky substance as the substrate, with a metal oxide layer coated on its surface. The metal oxide layer is 1 - 3 layers, and preferably 2 layers.

[0011] Furthermore, the flaky substance includes one or more of glass flakes, natural mica, synthetic mica, Al2O3 flakes, TiO2 flakes, SiO2 flakes, Fe2O3 flakes, BiOCl flakes, and metal flakes.

[0012] Furthermore, the metal oxide layer includes a mixture or complex of one or more of TiO2, SnO2, Fe2O3, Fe3O4, CoO, Co2O3, ZrO2, CrO3, SiO2, Al2O3, Al(OH)3, and MoS2.

[0013] Furthermore, the dark substance includes a mixture or complex of one or more of carbon black, vantablack, graphene, carbon nanotubes, and iron oxide black.

[0014] Further, the thickness of the inorganic flaky colored substance is 0.2 - 2.5 μm, wherein the thickness of the flaky substance is 0.1 - 2.0 μm, and the thickness of the metal oxide layer is 3.00 - 900 nm. Preferably, the thickness of the inorganic flaky colored substance is 0.5 - 1.5 μm, the thickness of the flaky substance is preferably 0.3 - 1.5 μm, and the thickness of the metal oxide layer is preferably 40 - 600 nm. The color presented changes with the thickness of the metal oxide layer coating.

[0015] Further, the fiber diameter is 5 - 500 μm, and preferably the fiber diameter is 10 - 300 μm.

[0016] Further, the content of the inorganic flaky colored substance is 1 - 30% of the mass fraction of the polymer, and preferably the content of the inorganic flaky colored substance is 4 - 20%.

[0017] Further, in the mixture of the inorganic flaky colored substance and the dark-colored substance, the mass fraction of the dark-colored substance is 1% - 2%.

[0018] The preparation method of the above-mentioned colored fiber comprises the following steps:

[0019] S1: Dissolve the polymer in a solvent, and perform secondary mixing with the inorganic flaky colored substance or the mixture of the inorganic flaky colored substance and the dark-colored substance at a specified temperature to obtain a mixed solution;

[0020] S2: Filter the mixed solution in S1 quantitatively supplied by a metering pump through a filter to obtain a spinning solution.

[0021] S3: Spin the spinning solution by solution spinning to prepare colored fibers.

[0022] Further, in step S1, the polymer includes one or more mixtures or composites of aromatic polyamides, polyesters, polyamides, polyacrylonitriles, polyethers, polyurethanes, polyureas, polypropylenes, polyvinyl chlorides, polyvinyl alcohols, polyvinyl acetals, polyformaldehydes, polyether ether ketones, cuprammonium, seaweeds, chitosans, chitins, cellulose acetates, phosphorus-modified phenolics, etc., artificial fibers, and natural fibers.

[0023] Further, in step S1, the solvent includes one or more of H2O, sodium thiocyanate, N-N-dimethylformamide (DMF), dimethyl sulfoxide (DMSO), dimethylacetamide (DMAC), N-methylmorpholine-N-oxide (NMMO), N-methylpyrrolidone (NMP), N,N-dimethylaniline (DMA), acetone, acetic acid, trifluoroacetic acid, dichloromethane, zinc chloride hydrate, tetraethylammonium hydroxide (TEAOH), urea, dilute sulfuric acid, sodium sulfate, zinc sulfate, aluminum sulfate, boric acid, cuprammonium solution, sodium hydroxide solution, or a mixture or complex thereof.

[0024] Further, in step S1, the temperature is 10 - 65 °C.

[0025] Further, in step S1, the way to mix evenly is stirring.

[0026] Further, in step S3, the spinning process includes spinning, coagulation, drawing, washing, and drying processes.

[0027] Further, in step S3, during the spinning process, spinning is carried out through a cylindrical spinneret.

[0028] Further, in step S3, the coagulation bath includes DMAC, sodium thiocyanate, calcium chloride, H2O, acetone, sodium hydroxide, sodium carbonate, absolute ethanol, sulfuric acid, zinc sulfate, sodium sulfate, aluminum sulfate, boric acid, barium chloride, etc. (such as aqueous sodium thiocyanate solution, aqueous calcium chloride solution, aqueous DMAC solution, mixed aqueous solution of sodium hydroxide and sodium carbonate, mixed solution of aqueous sodium hydroxide and absolute ethanol, aqueous solution of sulfuric acid and sodium sulfate, water, aqueous solution of calcium chloride and DMAC, acetone, mixed aqueous solution of dilute sulfuric acid, zinc sulfate, sodium sulfate, and aluminum sulfate, mixed aqueous solution of sodium sulfate and boric acid, aqueous sodium sulfate solution, aqueous barium chloride solution, aqueous sodium hydroxide solution), and the temperature is between 10 - 90 °C.

[0029] Further, in step S3, during the coagulation process, the running direction of the fiber is the same as the flowing direction of the coagulation bath solution (co-current).

[0030] Further, in step S3, the spinning process further includes a series of processes such as hot drawing, heat setting, and winding.

[0031] Further, dissolve the polymer in the solvent, stir well and then perform secondary stirring with inorganic flaky colored substances. After the solution becomes uniform, a spinning solution is obtained, which is quantitatively supplied by a metering pump to a filter for filtration, and then pressed into a coagulation bath tank through a cylindrical spinneret for solidification and forming. It is introduced into a preheating bath tank through a take-up roller, and preheating and stretching are carried out at a preheating bath temperature of 25 - 90 °C. The cellulose tow after being treated in the preheating bath is introduced into a washing tank for washing to remove impurities on the fiber. After washing, the tow is dried and other processes to obtain a cylindrical filament.

[0032] The present invention provides a unique arrangement method, which arranges inorganic flaky colored substances or their mixtures with dark substances parallel to the fiber axis and evenly arranges them around the fiber axis. This arrangement method enables the color of the fiber to be observed from different angles.

[0033] Advantages of the present invention: The present invention adopts the wet spinning technology to embed inorganic flaky colored substances or their mixtures with dark substances into the internal structure of the fiber to prepare colored cylindrical fibers. This transformation not only endows the fiber with extremely high color saturation and bright color, but also significantly improves its mechanical properties. Specifically, this new type of colored fiber exhibits excellent performance in terms of friction resistance, washability, weather resistance, heat resistance, and light stability. Description of the Drawings

[0034] Figure 1 It is the microscope image of the sodium alginate fiber obtained in Example 2 of the present invention. It can be seen from the figure that the fiber has a relatively high color saturation and a bright color.

[0035] Figure 2 It is the microscope image of the polyacrylonitrile fiber obtained in Example 8 of the present invention. It can be seen from the figure that the fiber has a relatively high color saturation and a bright color.

[0036] Figure 3 It is the microscope image of the viscose fiber obtained in Example 22 of the present invention. It can be seen from the figure that the fiber has a relatively high color saturation and a bright color.

[0037] Figure 4 It is the microscope image of the polyvinyl alcohol fiber obtained in Example 28 of the present invention. It can be seen from the figure that the fiber has a relatively high color saturation and a bright color.

[0038] Figure 5 It is the microscope image of the poly(m-phenylene isophthalamide) fiber obtained in Example 29 of the present invention. It can be seen from the figure that the fiber has a relatively high color saturation and a bright color.

[0039] Figure 6 It is the microscope image of the melamine formaldehyde fiber obtained in Example 27 of the present invention. It can be seen from the figure that the fiber has a relatively high color saturation and a bright color.

[0040] Figure 7 It is the microscope image of the polypropylene fiber obtained in Example 37 of the present invention. It can be seen from the figure that the fiber has a relatively high color saturation and a bright color.

[0041] Figure 8 It is the microscope image of the acetate fiber obtained in Example 36 of the present invention. It can be seen from the figure that the fiber has a relatively high color saturation and a bright color.

[0042] Figure 9 This is the microscopic image of the cross-section of the modal fiber obtained in Example 35 of the present invention. It can be seen from the figure that the fiber is a cylindrical fiber. Detailed implementation manners

[0043] The technical solutions of the present invention will be described below in conjunction with the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0044] The inorganic flaky colored substances described in the following embodiments are purchased from Liduoxin Technology Co., Ltd. and Tianyi Century Chemical Products Technology Development Co., Ltd.

[0045] Example 1

[0046] 110 g of polyacrylonitrile with a molecular weight of 150,000 was added to 300 g of DMAC solvent and stirred evenly to prepare a polyacrylonitrile solution. Subsequently, an inorganic flaky colored substance with a mass fraction of 1% relative to sodium polyacrylonitrile was added to 200 g of the polyacrylonitrile solution and stirred evenly to make a spinning solution; the inorganic flaky colored substance is composed of a glass sheet as a substrate with 3 layers of TiO2 coated on its surface. The thickness of the glass sheet is 1 μm, the thickness of one layer of TiO2 is 900 nm, and the thickness of the inorganic flaky colored substance is 3.7 μm. Subsequently, the polyacrylonitrile spinning solution was quantitatively supplied by a metering pump, filtered by a filter, and pressed into a coagulation bath through a cylindrical spinneret with a diameter of 500 μm for coagulation and forming: the coagulation bath is a 10% aqueous solution of sodium thiocyanate by mass fraction relative to water, and the bath temperature is 10°C; in the coagulation bath, the running direction of the fiber is the same as the flowing direction of the sodium thiocyanate solution (downstream). After the formed polyacrylonitrile fiber was solidified in the coagulation bath, the cylindrical filament passed through a godet roller. The speeds of the front and rear godet rollers were 14 m / min and 28 m / min, so that the fiber was stretched to a certain extent, and at the same time, the fiber was washed. Subsequently, the fiber entered the next water wash to wash the solvent inside the fiber. Finally, a dryer was used for drying.

[0047] Example 2

[0048] Sodium alginate was extracted by the acidification method. Seaweed with a mass fraction of 20% relative to water was soaked in water, and 0.5% formaldehyde relative to the seaweed was added. After swelling and softening, 1.5% sodium carbonate relative to the seaweed was added and reacted at 60 °C for 4 h. After the reaction, an aqueous calcium chloride solution with a mass fraction of 10% relative to water was added. Finally, the obtained product was washed with hydrochloric acid with a mass fraction of 10% relative to water and dried to obtain sodium alginate. Subsequently, 100 g of sodium alginate was taken and added to 300 g of water, and an inorganic flaky colored substance with a mass fraction of 30% relative to sodium alginate was added to 200 g of sodium alginate and stirred evenly to prepare a spinning solution; the inorganic flaky colored substance was composed of natural mica as the substrate, with a layer of SnO2 coated on its surface. The thickness of the natural mica was 0.5 μm, the thickness of the SnO2 layer was 400 nm, and the thickness of the inorganic flaky colored substance was 0.9 μm. The pretreated colored seaweed fiber spinning dope was quantitatively supplied by a metering pump to a filter for filtration, and then pressed into a coagulation bath through a cylindrical spinneret with a diameter of 20 μm for coagulation and shaping: the coagulation bath was an aqueous calcium chloride solution with a mass fraction of 10% relative to water, and the bath temperature was 25 °C: in the coagulation bath, the running direction of the fiber was the same as the flowing direction of the coagulation bath solution (co-current). The formed colored seaweed fiber was introduced into a preheating bath through a winding roller, and preheated and stretched at a preheating bath temperature of 50 °C. The cylindrical tow after being treated in the preheating bath was introduced into a water washing bath for water washing. After water washing, the tow was stretched in a stretching bath, and the stretching ratio was 1:2.5. It was dried and densified in a dryer. The dried fiber was crimped by a crimper, and the crimping speed was 30 m / min.

[0049] Example 3

[0050] 100 g of polyurethane with a molecular weight between 6,000 and 8,000 was added to 260 g of DMAC solvent and stirred evenly to prepare a polyurethane solution. Subsequently, inorganic flaky colored substances with a mass fraction of 5% relative to the polyurethane were added to 200 g of the polyurethane solution and stirred evenly to make a spinning solution; the inorganic flaky colored substances were composed of Fe2O3 flakes as the substrate, with 3 layers of SiO2 coated on its surface. The thickness of Fe2O3 was 0.6 μm, the thickness of one layer of SiO2 was 90 nm, and the thickness of the inorganic flaky colored substances was 0.9 μm. The spinning solution was quantitatively supplied by a metering pump, filtered by a filter, and pressed into a coagulation bath through a cylindrical spinneret with a diameter of 50 μm for coagulation and forming: the coagulation bath was a 15% DMAC aqueous solution with respect to the mass fraction of water, and the bath temperature was 25 °C. In the coagulation bath, the running direction of the fiber was the same as the flowing direction of the coagulation bath solution (co-current). The formed polyamide fiber was introduced into a preheating bath through a winding roll, and preheated and stretched at a preheating temperature of 40 °C. The polyamide fiber bundle after being treated in the preheating bath was introduced into a water washing bath for water washing to remove impurities on the fiber. After water washing, the fiber bundle was stretched in a stretching bath, and the stretching ratio was 1:2.5. The stretched polyamide fiber entered a dryer for drying and densification. The dried fiber was crimped by a crimper, and the crimping speed was 30 m / min.

[0051] Example 4

[0052] 100 g of polyamide with a molecular weight between 14,000 and 20,000 was added to 300 g of DMA solvent and stirred evenly to prepare a polyamide solution. Subsequently, inorganic flaky colored substances with a mass fraction of 20% relative to the polyamide were added to 200 g of the polyamide solution and stirred evenly to make a spinning solution; the inorganic flaky colored substances were composed of synthetic mica as the substrate, with 2 layers of Al(OH)3 coated on its surface. The thickness of the synthetic mica was 0.4 μm, the thickness of one layer of Al(OH)3 was 150 nm, and the thickness of the inorganic flaky colored substances was 0.7 μm. The spinning solution was quantitatively supplied by a metering pump, filtered by a filter, and pressed into a coagulation bath through a cylindrical spinneret with a diameter of 5 μm for coagulation and forming: the coagulation bath was a 10% DMAC aqueous solution with respect to the mass fraction of water, and the bath temperature was 30 °C. In the coagulation bath, the running direction of the fiber was the same as the flowing direction of the coagulation bath solution (co-current). The formed polyamide fiber was introduced into a preheating bath through a winding roll, and preheated and stretched at a preheating temperature of 60 °C. The polyamide fiber bundle after being treated in the preheating bath was introduced into a water washing bath for water washing to remove impurities on the fiber. After water washing, the fiber bundle was stretched in a stretching bath, and the stretching ratio was 1:2. The stretched polyamide fiber entered a dryer for drying and densification. The dried fiber was crimped by a crimper, and the crimping speed was 30 m / min.

[0053] Example 5

[0054] 100 g of polyester with a molecular weight between 16,000 and 20,000 was added to 300 g of DMA solvent and stirred evenly to prepare a polyester solution. Subsequently, inorganic flaky colored substances with a mass fraction of 15% relative to the polyester were added to 200 g of the polyester solution and stirred evenly to make a spinning solution; the inorganic flaky colored substances consisted of BiOCl metal flakes as the substrate, with 3 layers of BrO3 coated on its surface. The thickness of the BiOCl metal flakes was 0.1 μm, the thickness of one layer of BrO3 was 5 nm, and the thickness of the inorganic flaky colored substances was 0.2 μm. The spinning solution was quantitatively supplied by a metering pump, filtered by a filter, and pressed into a coagulation bath through a cylindrical spinneret with a diameter of 200 μm for coagulation and forming: the coagulation bath was a solution mixed with 10% sodium hydroxide aqueous solution with a mass fraction relative to water and 15% sodium carbonate aqueous solution with a mass fraction relative to water. The volume ratio of the sodium hydroxide aqueous solution to the sodium carbonate aqueous solution was 2:3, and the bath temperature was 35°C. In the coagulation bath, the running direction of the fiber was the same as the flowing direction of the coagulation bath solution (downstream). The formed polyester fiber was introduced into a preheating bath through a take-up roller and preheated and stretched at a preheating temperature of 50°C. The polyester fiber bundle after being treated in the preheating bath was introduced into a water washing bath for water washing to remove impurities on the fiber. After water washing, the fiber bundle was stretched in a stretching bath, and the stretching ratio was 1:3. The stretched polyester fiber was dried and densified. The dried fiber was crimped by a crimper, and the crimping speed was 30 m / min.

[0055] Example 6

[0056] 100 g of chitosan with a molecular weight of 160,000 was added to 300 g of NMP solvent and stirred evenly to prepare a chitosan solution. Subsequently, inorganic flaky colored substances with a mass fraction of 10% relative to the chitosan were added to 200 g of the chitosan solution and stirred evenly to make a spinning solution; the inorganic flaky colored substances consisted of Al2O3 flakes as the substrate, with 2 layers of Fe2O3 coated on its surface. The thickness of the Al2O3 flakes was 0.5 μm, the thickness of one layer of Fe2O3 was 300 nm, and the thickness of the inorganic flaky colored substances was 1.1 μm. The spinning solution was quantitatively supplied by a metering pump, filtered by a filter, and pressed into a coagulation bath through a cylindrical spinneret with a diameter of 350 μm for coagulation and forming: the coagulation bath was a solution mixed with 35% sodium hydroxide aqueous solution with a mass fraction relative to water and absolute ethanol. The volume ratio of the sodium hydroxide aqueous solution to the absolute ethanol was 5:5, and the bath temperature was 25°C. In the coagulation bath, the running direction of the fiber was the same as the flowing direction of the coagulation bath solution (downstream). The formed chitosan fiber was introduced into a preheating bath through a take-up roller and preheated and stretched at a preheating temperature of 40°C. The chitosan fiber bundle after being treated in the preheating bath was introduced into a water washing bath for water washing to remove impurities on the fiber. After water washing, the fiber bundle was stretched in a stretching bath, and the stretching ratio was 1:2. The stretched chitosan fiber entered a dryer for drying and densifying. The dried fiber was crimped by a crimper, and the crimping speed was 30 m / min.

[0057] Example 7

[0058] 100 g of methyl cellulose with a molecular weight between 160,000 and 200,000 was added to 280 g of TEAOH solvent and stirred evenly to prepare a methyl cellulose solution. Subsequently, inorganic flaky colored substances with a mass fraction of 25% relative to the methyl cellulose were added to 200 g of the methyl cellulose solution and stirred evenly to make a spinning solution; the inorganic flaky colored substances consisted of metal flakes as the substrate, with 2 layers of ZrO2 coated on its surface. The thickness of the metal flakes was 0.2 μm, the thickness of one layer of ZrO2 was 50 nm, and the thickness of the inorganic flaky colored substances was 0.3 μm. The spinning solution was quantitatively supplied by a metering pump, filtered by a filter, and pressed into a coagulation bath through a spinneret with a cylindrical shape of 80 μm in diameter for coagulation and forming: the coagulation bath was a solution mixed with 7.5% sulfuric acid by mass fraction relative to water and 10% sodium sulfate aqueous solution by mass fraction relative to water. The volume ratio of sulfuric acid to sodium sulfate aqueous solution was 2:3, and the bath temperature was 20°C. In the coagulation bath, the running direction of the fiber was the same as the flowing direction of the coagulation bath solution (co-current). The formed cellulose fiber was introduced into a preheating bath through a winding roller and preheated at 35°C for pre-stretching. The preheating bath was a 10% sodium sulfate aqueous solution by mass fraction relative to water. The cellulose tow after being treated in the preheating bath was introduced into a water washing tank for water washing to remove impurities on the fiber. After water washing, the tow was stretched in a stretching bath, and the stretching ratio was 1:2.5. The stretched fiber entered a dryer for drying and densification. The dried fiber was crimped by a crimper, and the crimping speed was 30 m / min.

[0059] Example 8

[0060] 110 g of polyacrylonitrile with a molecular weight of 150,000 was added to 300 g of DMAC solvent and stirred evenly to prepare a polyacrylonitrile solution. Subsequently, inorganic flaky colored substances with a mass fraction of 20% relative to polyacrylonitrile were added to 200 g of the polyacrylonitrile solution and stirred evenly to make a spinning solution; the inorganic flaky colored substances consisted of SiO2 flakes as the substrate, with 3 layers of MoS2 coated on its surface. The thickness of the SiO2 flakes was 0.6 μm, the thickness of one layer of MoS2 was 120 nm, and the thickness of the inorganic flaky colored substances was 1 μm. The spinning solution was quantitatively supplied by a metering pump to a filter and pressed into a coagulation bath through a cylindrical spinneret with a diameter of 250 μm for coagulation and forming: the coagulation bath was a 10% DMSO aqueous solution with respect to the mass fraction of water, and the bath temperature was 20 °C. In the coagulation bath, the running direction of the fiber was the same as the flowing direction of the DMSO solution (downstream). The formed polyacrylonitrile fiber was introduced into a preheating bath through a take-up roller for preheating and stretching. The preheating bath was a 10% DMSO aqueous solution with respect to the mass fraction of water, and the bath temperature was 65 °C. The polyacrylonitrile tow after being treated in the preheating bath was introduced into a water washing bath for water washing to remove the DMSO on the fiber. The hot water temperature in the water washing bath was 60 °C. The tow after water washing was stretched in a stretching bath, and the stretching ratio was 1:2.5. The stretched polyacrylonitrile fiber entered a dryer for drying and densification. The dried fiber was crimped by a crimper, and the crimping speed was 30 m / min.

[0061] Example 9

[0062] 100 g of cellulose acetate with a molecular weight of 115,000 was added to 350 g of an aqueous sodium thiocyanate solution with a mass fraction of 15% relative to water and stirred evenly to prepare a cellulose acetate solution. Subsequently, inorganic flaky colored substances with a mass fraction of 5% relative to cellulose acetate were added to 200 g of the cellulose acetate solution and stirred evenly to make a spinning solution; the inorganic flaky colored substances consisted of SiO2 flakes as the substrate, with 1 layer of CoO and 1 layer of Co2O3 coated on its surface. The thickness of the SiO2 flakes was 0.6 μm, the thickness of one layer of Co2O3 was 100 nm, the thickness of one layer of CoO was 100 nm, and the thickness of the inorganic flaky colored substances was 0.8 μm. The spinning solution was quantitatively supplied by a metering pump to a filter for filtration and pressed into a coagulation bath through a cylindrical spinneret with a diameter of 20 μm for coagulation and forming: the coagulation bath was water, and the bath temperature was 10 °C. In the coagulation bath, the running direction of the fiber was the same as the flowing direction of the coagulation bath (downstream). The formed cellulose acetate fiber was introduced into a preheating bath through a take-up roller, and preheating and stretching were carried out at a bath temperature of 60 °C. The cellulose acetate tow after being treated in the preheating bath was introduced into a water washing bath for water washing to remove the impurities on the fiber. After water washing, the tow was stretched in a stretching bath. The stretching ratio was 1:2. The stretched fiber entered a dryer for drying and densification. The dried fiber was crimped by a crimper, and the crimping speed was 30 m / min.

[0063] Example 10

[0064] 100 g of poly(m-phenylene isophthalamide) with a molecular weight of 140,000 was added to 320 g of DMAC solvent and stirred evenly to prepare a poly(m-phenylene isophthalamide) solution. Subsequently, inorganic flaky colored substances with a mass fraction of 15% relative to poly(m-phenylene isophthalamide) were added to 200 g of the poly(m-phenylene isophthalamide) solution and stirred evenly to make a spinning solution; among them, the inorganic flaky colored substances were composed of a TiO2 thin sheet as the substrate, with 1 layer of Al2O3 and 1 layer of Fe3O4 coated on its surface. The thickness of the TiO2 thin sheet was 0.2 μm, the thickness of the Al2O3 layer was 200 nm, the thickness of the Fe3O4 layer was 300 nm, and the thickness of the inorganic flaky colored substances was 0.7 μm, and its inorganic flaky colored substances. The spinning solution was quantitatively supplied by a metering pump, filtered by a filter, and pressed into a coagulation bath through a cylindrical spinneret with a diameter of 350 μm for coagulation and forming: the coagulation bath was a solution with a mass fraction ratio of H2O:DMAC:CaCl2 of 4.5:4:1.5, and the bath temperature was 30 °C: in the coagulation bath, the running direction of the fiber was the same as the flowing direction of the sodium thiocyanate solution (downstream). The formed poly(p-phenylene terephthalamide) fiber was introduced into a preheating bath through a take-up roll, and preheated and stretched at a bath temperature of 50 °C. The tow after preheating bath treatment was introduced into a water washing bath for water washing to wash away the impurities on the fiber. The tow after water washing was stretched in a stretching bath. The stretching ratio was 1:3, and the stretched fiber entered a dryer for drying and densification. The dried fiber was crimped by a crimper, and the crimping speed was 30 m / min.

[0065] Example 11

[0066] 100 g of cellulose acetate with a molecular weight of 115,000 was added to 350 g of an aqueous sodium thiocyanate solution with a mass fraction of 15% relative to water and stirred evenly to prepare a cellulose acetate solution. Subsequently, an inorganic flaky colored substance with a mass fraction of 30% relative to cellulose acetate was added to 200 g of the cellulose acetate solution and stirred evenly to make a spinning solution; the inorganic flaky colored substance consists of a BiOCl metal flake as the substrate, with 3 layers of BrO3 coated on its surface. The thickness of the BiOCl metal flake is 0.1 μm, the thickness of one layer of BrO3 is 5 nm, and the thickness of the inorganic flaky colored substance is 0.2 μm. The spinning solution was quantitatively supplied by a metering pump, filtered by a filter, and pressed into a coagulation bath through a cylindrical spinneret with a diameter of 50 μm for coagulation and forming: the coagulation bath is acetone, and the bath temperature is 30 °C; in the coagulation bath, the running direction of the fiber is the same as the flowing direction of the coagulation bath (downstream). The formed cellulose acetate fiber was introduced into a preheating bath through a take-up roll, and preheated and stretched at a bath temperature of 60 °C. The tow after preheating bath treatment was introduced into a water washing bath for water washing to remove impurities on the fiber, and the tow after water washing was stretched in a stretching bath. The draw ratio is 1:2, and the stretched cellulose acetate fiber enters a dryer for drying and densification. The dried fiber was crimped by a crimper, and the crimping speed is 30 m / min.

[0067] Example 12

[0068] 100 g of cellulose acetate with a molecular weight of 115,000 was added to 350 g of an aqueous sodium thiocyanate solution with a mass fraction of 15% relative to water and stirred evenly to prepare a cellulose acetate solution. Subsequently, an inorganic flaky colored substance with a mass fraction of 15% relative to cellulose acetate was added to 200 g of the cellulose acetate solution and stirred evenly to make a spinning solution; the inorganic flaky colored substance consists of a TiO2 flake as the substrate, with 2 layers of ZrO2 coated on its surface. The thickness of the TiO2 flake is 0.2 μm, the thickness of one layer of ZrO2 is 50 nm, and the thickness of the inorganic flaky colored substance is 0.3 μm. The spinning solution was quantitatively supplied by a metering pump, filtered by a filter, and pressed into a coagulation bath through a cylindrical spinneret with a diameter of 100 μm for coagulation and forming: the coagulation bath is H2O, and the bath temperature is 25 °C; in the coagulation bath, the running direction of the fiber is the same as the flowing direction of the coagulation bath (downstream). The formed cellulose acetate fiber was introduced into a preheating bath through a take-up roll, and preheated and stretched at a bath temperature of 30 °C. The tow after preheating bath treatment was introduced into a water washing bath for water washing to remove impurities on the fiber, and the tow after water washing was stretched in a stretching bath. The draw ratio is 1:3, and the stretched cellulose acetate fiber enters a dryer for drying and densification. The dried fiber was crimped by a crimper, and the crimping speed is 30 m / min.

[0069] Example 13

[0070] 100 g of polypropylene with a molecular weight of 120,000 - 200,000 is added to 300 g of DMAC solvent and stirred evenly to prepare a polypropylene solution. Subsequently, 15% by mass of inorganic flaky colored substance relative to polypropylene is added to 200 g of the polypropylene solution and stirred evenly to make a spinning solution; the inorganic flaky colored substance consists of TiO2 flakes as the substrate, with 2 layers of ZrO2 coated on its surface. The thickness of the TiO2 flakes is 0.2 μm, the thickness of one layer of ZrO2 is 50 nm, and the thickness of the inorganic flaky colored substance is 0.3 μm. The spinning solution is quantitatively supplied by a metering pump, filtered by a filter, and pressed into a coagulation bath through a cylindrical spinneret with a diameter of 5 μm for coagulation and forming: the coagulation bath is a 20% DMSO aqueous solution by mass relative to water, and the bath temperature is 20°C. In the coagulation bath, the running direction of the fiber is the same as the flowing direction of the DMSO solution (downstream). The formed polypropylene fiber is introduced into a preheating bath through a take-up roll for preheating and stretching. The preheating bath is a 20% DMSO aqueous solution by mass relative to water, and the bath temperature is 65°C. The polypropylene tow after being treated in the preheating bath is introduced into a water washing bath for water washing to wash off the DMSO on the fiber. After water washing, the tow is stretched in a stretching bath, and the stretching ratio is 1:2.5. The stretched polypropylene fiber is dried and densified. The dried fiber is crimped by a crimper, and the crimping speed is 30 m / min.

[0071] Example 14

[0072] 100 g of polypropylene with a molecular weight of 120,000 - 200,000 is added to 300 g of DMAC solvent and stirred evenly to prepare a polypropylene solution. Subsequently, 20% by mass of inorganic flaky colored substance relative to polypropylene is added to 200 g of the polypropylene solution and stirred evenly to make a spinning solution; the inorganic flaky colored substance consists of SiO2 flakes as the substrate, with 3 layers of MoS2 coated on its surface. The thickness of the SiO2 flakes is 0.6 μm, the thickness of one layer of MoS2 is 120 nm, and the thickness of the inorganic flaky colored substance is 1 μm. The spinning solution is quantitatively supplied by a metering pump, filtered by a filter, and pressed into a coagulation bath through a cylindrical spinneret with a diameter of 25 μm for coagulation and forming: the coagulation bath is a 20% DMSO aqueous solution by mass relative to water, and the bath temperature is 20°C. In the coagulation bath, the running direction of the fiber is the same as the flowing direction of the DMSO aqueous solution (downstream). The formed polypropylene fiber is introduced into a preheating bath through a take-up roll for preheating and stretching. The preheating bath is a 20% DMSO aqueous solution by mass relative to water, and the bath temperature is 90°C. The polypropylene tow after being treated in the preheating bath is introduced into a water washing bath for water washing to wash off the DMSO on the fiber. After water washing, the tow is stretched in a stretching bath, and the stretching ratio is 1:2.5. The stretched polypropylene fiber is dried and densified. The dried fiber is crimped by a crimper, and the crimping speed is 30 m / min.

[0073] Example 15

[0074] 100 g of polypropylene with a molecular weight of 120,000 - 200,000 is added to 300 g of DMAC solvent and stirred evenly to prepare a polypropylene solution. Subsequently, inorganic flaky colored substances with a mass fraction of 1% relative to polypropylene are added to 200 g of the polypropylene solution and stirred evenly to make a spinning solution; the inorganic flaky colored substances are composed of a glass flake as a substrate with 3 layers of TiO2 coated on its surface. The thickness of the glass flake is 1 μm, the thickness of one layer of TiO2 is 900 nm, and the thickness of the inorganic flaky colored substances is 3.7 μm. The spinning solution is quantitatively supplied by a metering pump, filtered by a filter, and pressed into a coagulation bath through a cylindrical spinneret with a diameter of 30 μm for coagulation and forming: the coagulation bath is a 20% DMSO aqueous solution with respect to the mass fraction of water, and the bath temperature is 20°C. In the coagulation bath, the running direction of the fiber is the same as the flowing direction of the DMSO aqueous solution (downstream). The formed polypropylene fiber is introduced into a preheating bath through a winding roll for preheating and stretching. The preheating bath is a 20% DMSO aqueous solution with respect to the mass fraction of water, and the bath temperature is 65°C. The polypropylene tow after being treated in the preheating bath is introduced into a water washing bath for water washing to wash off the DMSO on the fiber. After water washing, the tow is stretched in a stretching bath, and the stretching ratio is 1:2.5. The stretched polypropylene fiber enters a dryer for drying and densification. The dried fiber is crimped by a crimper, and the crimping speed is 30 m / min.

[0075] Example 16

[0076] 100 g of methyl cellulose with a molecular weight between 160,000 and 200,000 was added to 280 g of TEAOH solvent and stirred evenly to prepare a methyl cellulose solution. Subsequently, inorganic flaky colored substances with a mass fraction of 10% relative to methyl cellulose were added to 200 g of the methyl cellulose solution and stirred evenly to make a spinning solution; the inorganic flaky colored substances were composed of Al2O3 flakes as the substrate, with 2 layers of Fe2O3 coated on its surface. The thickness of the Al2O3 flakes was 0.5 μm, the thickness of one layer of Fe2O3 was 300 nm, and the thickness of the inorganic flaky colored substances was 1.1 μm. The spinning solution was quantitatively supplied by a metering pump, filtered by a filter, and pressed into a coagulation bath through a cylindrical spinneret with a diameter of 80 μm for coagulation and forming: the coagulation bath was a solution mixed with sulfuric acid with a mass fraction of 7.5% relative to water and sodium sulfate aqueous solution with a mass fraction of 10% relative to water, and the volume ratio of sulfuric acid to sodium sulfate aqueous solution was 2:3, and the bath temperature was 20 °C: in the coagulation bath, the running direction of the fiber was the same as the flowing direction of the coagulation bath solution (downstream). The formed cellulose fiber was introduced into a preheating bath through a take-up roll for preheating and stretching, and the water bath temperature was 60 °C. The cellulose tow after preheating bath treatment was introduced into a water washing bath for water washing to remove impurities on the fiber. The tow after water washing was stretched in a stretching bath, and the stretching ratio was 1:2. The stretched fiber entered a dryer for drying and densification. The dried fiber was crimped by a crimper, and the crimping speed was 30 m / min.

[0077] Example 17

[0078] 100 g of chitosan with a molecular weight of 160,000 was added to 300 g of NMP solvent and stirred evenly to prepare a chitosan solution. Subsequently, inorganic flaky colored substances with a mass fraction of 25% relative to chitosan were added to 200 g of the chitosan solution and stirred evenly to make a spinning solution; the inorganic flaky colored substances were composed of TiO2 flakes as the substrate, with 2 layers of ZrO2 coated on its surface. The thickness of the TiO2 flakes was 0.2 μm, the thickness of one layer of ZrO2 was 50 nm, and the thickness of the inorganic flaky colored substances was 0.3 μm. The spinning solution was quantitatively supplied by a metering pump, filtered by a filter, and pressed into a coagulation bath through a cylindrical spinneret with a diameter of 500 μm for coagulation and forming: the coagulation bath was a solution of sodium hydroxide aqueous solution with a mass fraction of 35% relative to water and anhydrous ethanol mixed, and the volume ratio of the sodium hydroxide aqueous solution to anhydrous ethanol was 5:5, and the bath temperature was 25 °C. In the coagulation bath, the running direction of the fiber was the same as the flowing direction of the coagulation bath solution (downstream). The formed chitosan fiber was introduced into a preheating bath through a take-up roller for preheating and stretching, and the water bath temperature was 40 °C. The chitosan fiber bundle after preheating bath treatment was introduced into a water washing bath for water washing to remove impurities on the fiber. After water washing, the fiber bundle was stretched in a stretching bath, and the stretching ratio was 1:2. The stretched chitosan fiber entered a dryer for drying and densification. The dried fiber was crimped by a crimper, and the crimping speed was 30 m / min.

[0079] Example 18

[0080] 100 g of polyester with a molecular weight between 16,000 and 20,000 was added to 300 g of DMA solvent and stirred evenly to prepare a polyester solution. Subsequently, inorganic flaky colored substances with a mass fraction of 20% relative to polyester were added to 200 g of the polyester solution and stirred evenly to make a spinning solution; the inorganic flaky colored substances were composed of SiO2 flakes as the substrate, with 3 layers of MoS2 coated on its surface. The thickness of the SiO2 flakes was 0.6 μm, the thickness of one layer of MoS2 was 120 nm, and the thickness of the inorganic flaky colored substances was 1 μm. The spinning solution was quantitatively supplied by a metering pump, filtered by a filter, and pressed into a coagulation bath through a cylindrical spinneret with a diameter of 400 μm for coagulation and forming: the coagulation bath was a solution of sodium hydroxide aqueous solution with a mass fraction of 10% relative to water and sodium carbonate aqueous solution with a mass fraction of 15% relative to water mixed, and the volume ratio of the sodium hydroxide aqueous solution to the sodium carbonate aqueous solution was 2:3, and the bath temperature was 25 °C. In the coagulation bath, the running direction of the fiber was the same as the flowing direction of the coagulation bath solution (downstream). The formed polyester fiber was introduced into a preheating bath through a take-up roller for preheating and stretching, and the water bath temperature was 40 °C. The polyester fiber bundle after preheating bath treatment was introduced into a water washing bath for water washing to remove impurities on the fiber. After water washing, the fiber bundle was stretched in a stretching bath, and the stretching ratio was 1:2. The stretched polyester fiber entered a dryer for drying and densification. The dried fiber was crimped by a crimper, and the crimping speed was 30 m / min.

[0081] Example 19

[0082] 100 g of polyamide with a molecular weight between 14,000 and 20,000 was added to 300 g of DMA solvent and stirred evenly to prepare a polyamide solution. Subsequently, inorganic flaky colored substances with a mass fraction of 5% relative to the polyamide were added to 200 g of the polyamide solution and stirred evenly to make a spinning solution; the inorganic flaky colored substances consisted of SiO2 flakes as the substrate, with 1 layer of CoO and 1 layer of Co2O3 coated on its surface. The thickness of the SiO2 flakes was 0.6 μm, the thickness of the Co2O3 layer was 100 nm, the thickness of the CoO layer was 100 nm, and the thickness of the inorganic flaky colored substances was 0.8 μm. The spinning solution was quantitatively supplied by a metering pump, filtered by a filter, and pressed into a coagulation bath through a cylindrical spinneret with a diameter of 350 μm for solidification and forming: the coagulation bath was a 20% DMAC aqueous solution with a mass fraction relative to water, and the bath temperature was 25 °C. In the coagulation bath, the running direction of the fiber was the same as the flowing direction of the coagulation bath solution (co-current). The formed polyamide fiber was introduced into a preheating bath through a take-up roll for preheating and stretching, and the water bath temperature was 40 °C. The polyamide fiber bundle after preheating bath treatment was introduced into a water washing bath for water washing to remove impurities on the fiber. After water washing, the fiber bundle was stretched in a stretching bath, and the stretching ratio was 1:2. The stretched polyamide fiber entered a dryer for drying and densification. The dried fiber was crimped by a crimper, and the crimping speed was 30 m / min.

[0083] Example 20

[0084] 100 g of viscose with a molecular weight between 90,000 and 106,000 was added to 300 g of dichloromethane solvent and stirred evenly to prepare a viscose solution. Subsequently, inorganic flaky colored substances with a mass fraction of 10% relative to the viscose were added to 200 g of the viscose solution and stirred evenly to make a spinning solution; the inorganic flaky colored substances consisted of SiO2 flakes as the substrate, with 2 layers of Al2O3 coated on its surface. The thickness of the SiO2 flakes was 0.6 μm, the thickness of one layer of Al2O3 was 200 nm, and the thickness of the inorganic flaky colored substances was 1 μm. The spinning solution was quantitatively supplied by a metering pump, filtered by a filter, and pressed into a coagulation bath through a cylindrical spinneret with a diameter of 200 μm for coagulation and forming: the coagulation bath was a solution mixed with 2% dilute sulfuric acid with a mass fraction relative to water, 2% sodium sulfate aqueous solution with a mass fraction relative to water, 3% zinc sulfate aqueous solution with a mass fraction relative to water, and 3% aluminum sulfate aqueous solution with a mass fraction relative to water. The volume ratio of the dilute sulfuric acid, sodium sulfate aqueous solution, zinc sulfate aqueous solution, and aluminum sulfate aqueous solution was 1:1.5:1:1.5, and the bath temperature was 25 °C. In the coagulation bath, the running direction of the fiber was the same as the flowing direction of the coagulation bath solution (downstream). The formed viscose fiber was introduced into a preheating bath through a take-up roller for preheating and stretching, and the water bath temperature was 40 °C. The viscose fiber bundle after preheating bath treatment was introduced into a water washing tank for water washing to remove impurities on the fiber. After water washing, the fiber bundle was stretched in a stretching bath, and the stretching ratio was 1:2.5. The stretched viscose fiber entered a dryer for drying and densification. The dried fiber was crimped by a crimper, and the crimping speed was 30 m / min.

[0085] Example 21

[0086] 100 g of viscose with a molecular weight between 90,000 and 106,000 was added to 300 g of dichloromethane solvent and stirred evenly to prepare a viscose solution. Subsequently, inorganic flaky colored substances with a mass fraction of 25% relative to the viscose were added to 200 g of the viscose solution and stirred evenly to make a spinning solution; the inorganic flaky colored substances were composed of TiO2 thin sheets as the substrate, with 2 layers of ZrO2 coated on its surface. The thickness of the TiO2 thin sheets was 0.2 μm, the thickness of one layer of ZrO2 was 50 nm, and the thickness of the inorganic flaky colored substances was 0.3 μm. The spinning solution was quantitatively supplied by a metering pump, filtered by a filter, and pressed into a coagulation bath through a cylindrical spinneret with a diameter of 150 μm for coagulation and forming: the coagulation bath was a solution mixed with 2% dilute sulfuric acid with a mass fraction relative to water, 2% sodium sulfate aqueous solution with a mass fraction relative to water, 3% zinc sulfate aqueous solution with a mass fraction relative to water, and 3% aluminum sulfate aqueous solution with a mass fraction relative to water. The volume ratio of the dilute sulfuric acid, sodium sulfate aqueous solution, zinc sulfate aqueous solution, and aluminum sulfate aqueous solution was 1:1.5:1:1.5, and the bath temperature was 25 °C. In the coagulation bath, the running direction of the fiber was the same as the flowing direction of the coagulation bath solution (downstream). The formed viscose fiber was introduced into a preheating bath through a take-up roll, and preheated and stretched at a water bath temperature of 40 °C. The viscose fiber bundle after preheating bath treatment was introduced into a water washing tank for water washing to remove impurities on the fiber. The washed fiber bundle was stretched in a stretching bath, and the stretching ratio was 1:2.5. The stretched viscose fiber was dried and densified. The dried fiber was crimped by a crimper, and the crimping speed was 30 m / min.

[0087] Example 22

[0088] 100 g of viscose with a molecular weight between 90,000 and 106,000 was added to 300 g of trifluoroacetic acid solvent and stirred evenly to prepare a viscose solution. Subsequently, inorganic flaky colored substances with a mass fraction of 5% relative to viscose were added to 200 g of the viscose solution and stirred evenly to make a spinning solution; the inorganic flaky colored substances consisted of SiO2 flakes as the substrate, with 1 layer of CoO coated on its surface. The thickness of the SiO2 flakes was 0.6 μm, the thickness of the CoO layer was 100 nm, and the thickness of the inorganic flaky colored substances was 0.7 μm. The spinning solution was quantitatively supplied by a metering pump, filtered by a filter, and pressed into a coagulation bath through a cylindrical spinneret with a diameter of 20 μm for coagulation and forming: the coagulation bath was a solution mixed with 2% dilute sulfuric acid with a mass fraction relative to water, 2% sodium sulfate aqueous solution with a mass fraction relative to water, 3% zinc sulfate aqueous solution with a mass fraction relative to water, and 3% aluminum sulfate aqueous solution with a mass fraction relative to water. The volume ratio of the dilute sulfuric acid, sodium sulfate aqueous solution, zinc sulfate aqueous solution, and aluminum sulfate aqueous solution was 1:1.5:1:1.5, and the bath temperature was 25 °C. In the coagulation bath, the running direction of the fiber was the same as the flowing direction of the coagulation bath solution (downstream). The formed viscose fiber was introduced into a preheating bath through a take-up roll, and preheated and stretched at a water bath temperature of 40 °C. The viscose fiber bundle after preheating bath treatment was introduced into a water washing tank for water washing to remove impurities on the fiber. The washed fiber bundle was stretched in a stretching bath, and the stretching ratio was 1:2.5. The stretched viscose fiber was dried and densified. The dried fiber was crimped by a crimper, and the crimping speed was 30 m / min.

[0089] Example 23

[0090] 100 g of polyurethane with a molecular weight between 6000 and 8000 was added to 260 g of trifluoroacetic acid solvent and stirred evenly to prepare a polyurethane solution. Subsequently, inorganic flaky colored substances with a mass fraction of 15% relative to the polyurethane were added to 200 g of the polyurethane solution and stirred evenly to make a spinning solution; the inorganic flaky colored substances consisted of a TiO2 thin sheet as the substrate, with a layer of Al2O3 and a layer of Fe3O4 coated on its surface. The thickness of the TiO2 thin sheet was 0.2 μm, the thickness of the Al2O3 layer was 200 nm, the thickness of the Fe3O4 layer was 300 nm, and the thickness of the inorganic flaky colored substances was 0.7 μm. The spinning solution was quantitatively supplied by a metering pump, filtered by a filter, and pressed into a coagulation bath through a cylindrical spinneret with a diameter of 20 μm for solidification: the coagulation bath was a 20% DMAC aqueous solution with respect to the mass fraction of water, and the bath temperature was 25 °C. In the coagulation bath, the running direction of the fiber was the same as the flow direction of the coagulation bath solution (downstream). The formed polyurethane fiber was introduced into a preheating bath through a winding roller, and preheated and stretched at a water bath temperature of 35 °C. The polyurethane fiber tow after preheating bath treatment was introduced into a water washing bath for water washing to remove impurities on the fiber. The tow after water washing was stretched in a stretching bath, and the stretching ratio was 1:2.5. The stretched polyurethane fiber was dried and densified. The dried fiber was crimped by a crimper, and the crimping speed was 30 m / min.

[0091] Example 24

[0092] 130 g of modified phenolic resin with a molecular weight between 3000 and 5000 was added to 260 g of acetone solvent and stirred evenly to prepare a modified phenolic resin solution. Subsequently, inorganic flaky colored substances with a mass fraction of 30% relative to the modified phenolic resin were added to 200 g of the poly-modified phenolic resin solution and stirred evenly to form a spinning solution. The inorganic flaky colored substances were composed of TiO2 flakes as the substrate, with 3 layers of Fe3O4 coated on its surface. The thickness of the TiO2 flakes was 0.2 μm, the thickness of one layer of Fe3O4 was 300 nm, and the thickness of the inorganic flaky colored substances was 1.1 μm. The spinning solution was quantitatively supplied by a metering pump, filtered by a filter, and pressed into a coagulation bath through a cylindrical spinneret with a diameter of 10 μm for solidification and shaping. The coagulation bath was a solution mixed with a 15% sodium sulfate aqueous solution with respect to water and a 10% boric acid aqueous solution with respect to water. The volume ratio of the sodium sulfate aqueous solution to the boric acid aqueous solution was 2:3, and the bath temperature was 20 °C. In the coagulation bath, the running direction of the fiber was the same as the flowing direction of the coagulation bath solution (downstream). The formed modified phenolic resin fiber was introduced into a preheating bath through a take-up roller, and preheated and stretched at a water bath temperature of 35 °C. The modified phenolic resin fiber bundle after preheating bath treatment was introduced into a water washing bath for water washing to remove impurities on the fiber. After water washing, the fiber bundle was stretched in a stretching bath, and the stretching ratio was 1:2.5. The stretched modified phenolic resin fiber entered a dryer for drying and densification. The dried fiber was crimped by a crimper, and the crimping speed was 30 m / min.

[0093] Example 25

[0094] 100 g of melamine formaldehyde with a molecular weight between 12,000 and 15,000 was added to 260 g of boric acid solvent and stirred evenly to prepare a melamine formaldehyde solution. Subsequently, inorganic flaky colored substances with a mass fraction of 25% relative to melamine formaldehyde were added to 200 g of the melamine formaldehyde solution and stirred evenly to make a spinning solution; the inorganic flaky colored substances were composed of SiO2 flakes as the substrate, with 3 layers of MoS2 coated on its surface. The thickness of the SiO2 flakes was 0.6 μm, the thickness of one layer of MoS2 was 120 nm, and the thickness of the inorganic flaky colored substances was 1 μm. The spinning solution was quantitatively supplied by a metering pump, filtered by a filter, and pressed into a coagulation bath through a cylindrical spinneret with a diameter of 100 μm for coagulation and forming: the coagulation bath was a 10% sodium sulfate aqueous solution relative to water, and the bath temperature was 30 °C. In the coagulation bath, the running direction of the fiber was the same as the flowing direction of the coagulation bath solution (downstream). The formed melamine formaldehyde fiber was introduced into a preheating bath through a take-up roll, and preheated and stretched at a water bath temperature of 45 °C. The melamine formaldehyde fiber bundle after being treated in the preheating bath was introduced into a water washing bath for water washing to remove impurities on the fiber. After water washing, the bundle was stretched in a stretching bath, and the stretching ratio was 1:3. The stretched melamine formaldehyde fiber entered a dryer for drying and densification. The dried fiber was crimped by a crimper, and the crimping speed was 30 m / min.

[0095] Example 26

[0096] 100 g of melamine formaldehyde with a molecular weight between 12,000 and 15,000 was added to 260 g of boric acid solvent and stirred evenly to prepare a melamine formaldehyde solution. Subsequently, inorganic flaky colored substances with a mass fraction of 30% relative to melamine formaldehyde were added to 200 g of the melamine formaldehyde solution and stirred evenly to make a spinning solution; the inorganic flaky colored substances were composed of TiO2 flakes as the substrate, with 3 layers of Fe3O4 coated on its surface. The thickness of the TiO2 flakes was 0.2 μm, the thickness of one layer of Fe3O4 was 300 nm, and the thickness of the inorganic flaky colored substances was 1.1 μm. The spinning solution was quantitatively supplied by a metering pump, filtered by a filter, and pressed into a coagulation bath through a cylindrical spinneret with a diameter of 150 μm for coagulation and forming: the coagulation bath was a 10% sodium sulfate aqueous solution relative to water, and the bath temperature was 30 °C. In the coagulation bath, the running direction of the fiber was the same as the flowing direction of the coagulation bath solution (downstream). The formed melamine formaldehyde fiber was introduced into a preheating bath through a take-up roll, and preheated and stretched at a water bath temperature of 45 °C. The melamine formaldehyde fiber bundle after being treated in the preheating bath was introduced into a water washing bath for water washing to remove impurities on the fiber. After water washing, the bundle was stretched in a stretching bath, and the stretching ratio was 1:3. The stretched melamine formaldehyde fiber entered a dryer for drying and densification. The dried fiber was crimped by a crimper, and the crimping speed was 30 m / min.

[0097] Example 27

[0098] 100 g of melamine formaldehyde with a molecular weight between 12,000 and 15,000 was added to 260 g of boric acid solvent and stirred evenly to prepare a melamine formaldehyde solution. Subsequently, inorganic flaky colored substances with a mass fraction of 10% relative to melamine formaldehyde were added to 200 g of the melamine formaldehyde solution and stirred evenly to make a spinning solution; the inorganic flaky colored substances were composed of Al2O3 flakes as the substrate, with 2 layers of Fe2O3 coated on its surface. The thickness of the Al2O3 flakes was 0.5 μm, the thickness of one layer of Fe2O3 was 300 nm, and the thickness of the inorganic flaky colored substances was 1.1 μm. The spinning solution was quantitatively supplied by a metering pump, filtered by a filter, and pressed into a coagulation bath through a cylindrical spinneret with a diameter of 20 μm for coagulation and forming: the coagulation bath was a 10% sodium sulfate aqueous solution relative to water, and the bath temperature was 30 °C. In the coagulation bath, the running direction of the fiber was the same as the flowing direction of the coagulation bath solution (co-current). The formed melamine formaldehyde fiber was introduced into a preheating bath through a take-up roller, and preheated and stretched at a water bath temperature of 45 °C. The melamine formaldehyde fiber bundle after being treated in the preheating bath was introduced into a water washing bath for water washing to wash away the impurities on the fiber. After water washing, the fiber bundle was stretched in a stretching bath, and the stretching ratio was 1:3. The stretched melamine formaldehyde fiber entered a dryer for drying and densification. The dried fiber was crimped by a crimper, and the crimping speed was 30 m / min.

[0099] Example 28

[0100] 100 g of polyvinyl alcohol with a molecular weight between 60,000 and 80,000 was added to 260 g of DMAC and stirred evenly to prepare a polyvinyl alcohol solution. Subsequently, inorganic flaky colored substances with a mass fraction of 4% relative to polyvinyl alcohol were added to 200 g of the polyvinyl alcohol solution and stirred evenly to make a spinning solution; the inorganic flaky colored substances were composed of TiO2 flakes as the substrate, with 2 layers of ZrO2 coated on its surface. The thickness of the TiO2 flakes was 0.2 μm, the thickness of one layer of ZrO2 was 50 nm, and the thickness of the inorganic flaky colored substances was 0.3 μm. The spinning solution was quantitatively supplied by a metering pump, filtered by a filter, and pressed into a coagulation bath through a cylindrical spinneret with a diameter of 20 μm for coagulation and forming: the coagulation bath was a 15% barium chloride aqueous solution relative to water, and the bath temperature was 35 °C. In the coagulation bath, the running direction of the fiber was the same as the flowing direction of the coagulation bath solution (co-current). The formed polyvinyl alcohol fiber was introduced into a preheating bath through a take-up roller, and preheated and stretched at a water bath temperature of 90 °C. The polyvinyl alcohol fiber bundle after being treated in the preheating bath was introduced into a water washing bath for water washing to wash away the impurities on the fiber. After water washing, the fiber bundle was stretched in a stretching bath, and the stretching ratio was 1:2. The stretched polyvinyl alcohol fiber entered a dryer for drying and densification. The dried fiber was crimped by a crimper, and the crimping speed was 30 m / min.

[0101] Example 29

[0102] 100 g of poly(m-phthaloyl m-phenylenediamine) with a molecular weight of 140,000 was added to 320 g of DMAC solvent and stirred evenly to prepare a poly(m-phthaloyl m-phenylenediamine) solution. Subsequently, inorganic flaky colored substances with a mass fraction of 10% relative to poly(m-phthaloyl m-phenylenediamine) were added to 200 g of the poly(m-phthaloyl m-phenylenediamine) solution and stirred evenly to make a spinning solution; the inorganic flaky colored substances were composed of SiO2 flakes as the substrate, with 2 layers of Al2O3 coated on its surface. The thickness of the SiO2 flakes was 0.6 μm, the thickness of one layer of Al2O3 was 200 nm, and the thickness of the inorganic flaky colored substances was 1 μm. The spinning solution was quantitatively supplied by a metering pump, filtered through a filter, and pressed into a coagulation bath through a cylindrical spinneret with a diameter of 20 μm for coagulation and forming: the coagulation bath was a 20% DMAC aqueous solution relative to water, and the bath temperature was 25°C. In the coagulation bath, the running direction of the fiber was the same as the flowing direction of the coagulation bath solution (downstream). The formed poly(m-phthaloyl m-phenylenediamine) fiber was introduced into a preheating bath through a take-up roll, and preheated and stretched at a water bath temperature of 50°C. The poly(m-phthaloyl m-phenylenediamine) fiber tow after preheating bath treatment was introduced into a water washing bath for water washing to remove impurities on the fiber. After water washing, the tow was stretched in a stretching bath, and the stretching ratio was 1:2. The stretched poly(m-phthaloyl m-phenylenediamine) fiber entered a dryer for drying and densification. The dried fiber was crimped by a crimper, and the crimping speed was 30 m / min.

[0103] Example 30

[0104] 100 g of polyvinyl alcohol with a molecular weight between 60,000 and 80,000 was added to 260 g of DMAC and stirred evenly to prepare a polyvinyl alcohol solution. Subsequently, inorganic flaky colored substances with a mass fraction of 20% relative to polyvinyl alcohol were added to 200 g of the polyvinyl alcohol solution and stirred evenly to make a spinning solution; the inorganic flaky colored substances were composed of natural mica as the substrate, with 1 layer of SnO2 coated on its surface. The thickness of the natural mica was 0.5 μm, the thickness of one layer of SnO2 was 400 nm, and the thickness of the inorganic flaky colored substances was 0.9 μm. The spinning solution was quantitatively supplied by a metering pump, filtered through a filter, and pressed into a coagulation bath through a cylindrical spinneret with a diameter of 100 μm for coagulation and forming: the coagulation bath was a 5% sodium sulfate aqueous solution relative to water, and the bath temperature was 25°C: in the coagulation bath, the running direction of the fiber was the same as the flowing direction of the sodium sulfate solution (downstream). The formed polyvinyl alcohol fiber, after the cylindrical filament in the coagulation bath was appropriately cured, entered a hot water bath through a godet roll. The hot water bath temperature was controlled at 50°C and the stretching ratio was 1:2 to stretch the fiber to a certain extent and also wash the fiber. Subsequently, the fiber entered the next water washing to wash the solvent inside the fiber. Finally, it was dried by a dryer.

[0105] Example 31

[0106] 100 g of chitin cellulose with a molecular weight between 130,000 and 180,000 was added to 280 g of NMMO solvent and stirred evenly to prepare a chitin cellulose solution. Subsequently, inorganic flaky colored substances with a mass fraction of 10% relative to chitin cellulose were added to 200 g of the chitin cellulose solution and stirred evenly to make a spinning solution; the inorganic flaky colored substances were composed of Al2O3 flakes as the substrate, with 2 layers of Fe2O3 coated on its surface. The thickness of the Al2O3 flakes was 0.5 μm, the thickness of one layer of Fe2O3 was 300 nm, and the thickness of the inorganic flaky colored substances was 1.1 μm. The spinning solution was quantitatively supplied by a metering pump, filtered by a filter, and pressed into a coagulation bath through a cylindrical spinneret with a diameter of 500 μm for coagulation and forming: the coagulation bath was a 10% sodium hydroxide aqueous solution with respect to water, and the bath temperature was 25°C: in the coagulation bath, the running direction of the fiber was the same as the flowing direction of the coagulation bath solution (downstream). The formed chitin fiber was introduced into a preheating bath through a winding roller, and preheated and stretched at a water bath temperature of 50°C. The chitin fiber bundle after preheating bath treatment was introduced into a water washing bath for water washing to remove impurities on the fiber. After water washing, the fiber bundle was stretched in a stretching bath, and the stretching ratio was 1:3. The stretched fiber entered a dryer for drying and densification. The dried fiber was crimped by a crimper, and the crimping speed was 30 m / min.

[0107] Example 32

[0108] 110 g of polyvinyl chloride with a molecular weight between 60,000 and 150,000 was added to 300 g of acetone and stirred evenly to prepare a polyvinyl chloride solution. Subsequently, inorganic flaky colored substances with a mass fraction of 20% relative to polyvinyl chloride were added to 200 g of the polyvinyl chloride solution and stirred evenly to make a spinning solution; the inorganic flaky colored substances were composed of Al2O3 flakes as the substrate, with 1 layer of Fe2O3 coated on its surface. The thickness of the Al2O3 flakes was 0.5 μm, the thickness of one layer of Fe2O3 was 300 nm, and the thickness of the inorganic flaky colored substances was 0.8 μm. The spinning solution was quantitatively supplied by a metering pump, filtered by a filter, and pressed into a coagulation bath through a cylindrical spinneret with a diameter of 300 μm for coagulation and forming: the coagulation bath was a 10% sodium hydroxide aqueous solution with respect to water, and the bath temperature was 25°C: in the coagulation bath, the running direction of the fiber was the same as the flowing direction of the coagulation bath solution (downstream). The formed polyvinyl chloride fiber was introduced into a preheating bath through a winding roller, and preheated and stretched at a water bath temperature of 50°C. The polyvinyl chloride fiber bundle after preheating bath treatment was introduced into a water washing bath for water washing to remove impurities on the fiber. After water washing, the fiber bundle was stretched in a stretching bath, and the stretching ratio was 1:3. The stretched fiber entered a dryer for drying and densification. The dried fiber was crimped by a crimper, and the crimping speed was 30 m / min.

[0109] Example 33

[0110] 100 g of chitin cellulose with a molecular weight between 130,000 and 180,000 was added to 280 g of NMMO solvent and stirred evenly to prepare a chitin cellulose solution. Subsequently, inorganic flaky colored substances with a mass fraction of 1% relative to the chitin cellulose were added to 200 g of the chitin cellulose solution and stirred evenly to make a spinning solution; the inorganic flaky colored substances consisted of a glass flake as the substrate, with 3 layers of TiO2 coated on its surface. The thickness of the glass flake was 1 μm, the thickness of one layer of TiO2 was 900 nm, and the thickness of the inorganic flaky colored substances was 3.7 μm. The spinning solution was quantitatively supplied by a metering pump, filtered by a filter, and pressed into a coagulation bath through a cylindrical spinneret with a diameter of 200 μm for coagulation and forming: the coagulation bath was a 10% sodium hydroxide aqueous solution with a mass fraction relative to water, and the bath temperature was 25°C; in the coagulation bath, the running direction of the fiber was the same as the flowing direction of the coagulation bath solution (downstream). The formed chitin fiber was introduced into a preheating bath through a take-up roll, and preheated and stretched at a water bath temperature of 50°C. The chitin fiber bundle after preheating bath treatment was introduced into a water washing tank for water washing to wash away the impurities on the fiber. The fiber bundle after water washing was stretched in a stretching bath, and the stretching ratio was 1:3. The stretched fiber entered a dryer for drying and densification. The dried fiber was crimped by a crimper, and the crimping speed was 30 m / min.

[0111] Example 34

[0112] 100 g of polyamide with a molecular weight between 14,000 and 20,000 was added to 300 g of DMA solvent and stirred evenly to prepare a polyamide solution. Subsequently, inorganic flaky colored substances with a mass fraction of 20% relative to the polyamide were added to 200 g of the polyamide solution and stirred evenly to make a spinning solution; the inorganic flaky colored substances consisted of a SiO2 thin sheet as the substrate, with a layer of CoO and a layer of Co2O3 coated on its surface. The thickness of the SiO2 thin sheet was 0.6 μm, the thickness of the Co2O3 layer was 100 nm, the thickness of the CoO layer was 100 nm, and the thickness of the inorganic flaky colored substances was 0.8 μm. The spinning solution was quantitatively supplied by a metering pump, filtered by a filter, and pressed into a coagulation bath through a cylindrical spinneret with a diameter of 350 μm for coagulation and forming: the coagulation bath was a 15% DMAC aqueous solution with respect to the mass fraction of water, and the bath temperature was 15 °C. In the coagulation bath, the running direction of the fiber was the same as the flowing direction of the coagulation bath solution (co-current). The formed polyamide fiber was introduced into a preheating bath through a take-up roll, and preheated and stretched at a water bath temperature of 25 °C. The polyamide fiber bundle after being treated in the preheating bath was introduced into a water washing bath for water washing to wash away the impurities on the fiber. After water washing, the fiber bundle was stretched in a stretching bath, and the stretching ratio was 1:2.5. The stretched polyamide fiber entered a dryer for drying and densification. The dried fiber was crimped by a crimper, and the crimping speed was 30 m / min.

[0113] Example 35

[0114] 100 g of polyvinyl alcohol with a molecular weight between 60,000 and 80,000 was added to 260 g of DMAC and stirred evenly to prepare a polyvinyl alcohol solution. Subsequently, inorganic flaky colored substances with a mass fraction of 20% relative to the polyvinyl alcohol and carbon black with a mass fraction of 2% relative to the polyvinyl alcohol were mixed and added to 200 g of the polyvinyl alcohol solution and stirred evenly to make a spinning solution; the inorganic flaky colored substances consisted of a natural mica as the substrate, with a layer of SnO2 coated on its surface. The thickness of the natural mica was 0.5 μm, the thickness of the SnO2 layer was 400 nm, and the thickness of the inorganic flaky colored substances was 0.9 μm. The spinning solution was quantitatively supplied by a metering pump, filtered by a filter, and pressed into a coagulation bath through a cylindrical spinneret with a diameter of 20 μm for coagulation and forming: the coagulation bath was a 5% sodium sulfate aqueous solution with respect to the mass fraction of water, and the bath temperature was 25 °C: in the coagulation bath, the running direction of the fiber was the same as the flowing direction of the sodium sulfate solution (co-current). The formed polyvinyl alcohol fiber, after the filament was appropriately cured in the coagulation bath, entered a hot water bath through a godet roll. The hot water bath temperature was controlled at 30 °C and the speed ratio of the front and rear godet rolls was 1:2.5, so that the fiber was stretched to a certain extent and the fiber was also washed. Subsequently, the fiber entered the next water washing to wash the solvent inside the fiber. Finally, it was dried by a dryer.

[0115] Example 36

[0116] 100 g of cellulose acetate with a molecular weight of 115,000 was added to 350 g of sodium thiocyanate solvent and stirred evenly to prepare a cellulose acetate solution. Subsequently, inorganic flaky colored substances with a mass fraction of 20% relative to cellulose acetate and iron oxide black with a mass fraction of 1% relative to cellulose acetate were mixed and added to 200 g of cellulose acetate solution and stirred evenly to make a spinning solution; the inorganic flaky colored substances were composed of TiO2 thin sheets as the substrate, with 2 layers of ZrO2 coated on its surface. The thickness of the TiO2 thin sheets was 0.2 μm, the thickness of one layer of ZrO2 was 50 nm, and the thickness of the inorganic flaky colored substances was 0.3 μm. The spinning solution was quantitatively supplied by a metering pump, filtered by a filter, and pressed into a coagulation bath through a cylindrical spinneret with a diameter of 20 μm for coagulation and forming: the coagulation bath was H2O, and the bath temperature was 25 °C. In the coagulation bath, the running direction of the fiber was the same as the flowing direction of the coagulation bath (downstream). The formed cellulose acetate fiber was introduced into a preheating bath through a take-up roller, and the water bath temperature was 30 °C for preheating and stretching. The tow after preheating bath treatment was introduced into a washing bath for washing to remove impurities on the fiber. After washing, the tow was stretched in a stretching bath, and the stretching ratio was 1:2. The stretched cellulose acetate fiber entered a dryer for drying and densification. The dried fiber was crimped by a crimper, and the crimping speed was 30 m / min.

[0117] Example 37

[0118] 100 g of polypropylene with a molecular weight of 120,000 - 200,000 was added to 300 g of DMAC solvent and stirred evenly to prepare a polypropylene solution. Subsequently, inorganic flaky colored substances with a mass fraction of 15% relative to polypropylene and graphene with a mass fraction of 2% relative to polypropylene were mixed and added to 200 g of polypropylene solution and stirred evenly to make a spinning solution; the inorganic flaky colored substances were composed of TiO2 thin sheets as the substrate, with 2 layers of ZrO2 coated on its surface. The thickness of the TiO2 thin sheets was 0.2 μm, the thickness of one layer of ZrO2 was 50 nm, and the thickness of the inorganic flaky colored substances was 0.3 μm. The spinning solution was quantitatively supplied by a metering pump, filtered by a filter, and pressed into a coagulation bath through a cylindrical spinneret with a diameter of 20 μm for coagulation and forming: the coagulation bath was a 20% DMSO aqueous solution by mass fraction relative to water, and the bath temperature was 20 °C. In the coagulation bath, the running direction of the fiber was the same as the flowing direction of the DMSO solution (downstream). The formed polypropylene fiber was introduced into a preheating bath through a take-up roller for preheating and stretching. The preheating bath was a 20% DMSO aqueous solution by mass fraction relative to water, and the bath temperature was 65 °C. The polypropylene tow after preheating bath treatment was introduced into a washing bath for washing to remove DMSO on the fiber. After washing, the tow was stretched in a stretching bath, and the stretching ratio was 1:3. The stretched polypropylene fiber entered a dryer for drying and densification. The dried fiber was crimped by a crimper, and the crimping speed was 30 m / min.

[0119] Example 38

[0120] The light fastness of Examples 5, 19, 22 and 34 was tested on an AtlasXenoTest Alpha light fastness tester of SDL-Atalas Company in the United States according to the method of AATCC TM16-2003, and the color change was rated with a gray scale for color change evaluation of GB250-1995; there was no obvious damage after 200 friction cycles; after being washed with warm water 30 times, there was no obvious change on the fiber surface. The test results are shown in Table 1.

[0121] Table 1 Properties of synthetic fibers in some examples

[0122]

[0123] All of the above colored fibers are based on polymer fibers, and the inorganic flaky colored substances or their mixtures with dark substances are arranged parallel to the fiber axis and evenly embedded inside the polymer fibers. This method of arranging the inorganic flaky colored substances or their mixtures with dark substances parallel to the fiber axis and evenly embedding them inside the polymer fibers results in fibers with good weather resistance, heat resistance, light stability and brighter colors; due to the large specific surface area of the inorganic flaky colored substances and the embedding of their mixtures inside the fibers, the fibers have abrasion resistance and washability.

[0124] For all those skilled in the art of research, without departing from the technical scope of the present invention, the above technical content can be used to make possible modifications and changes to the solution of the present invention, or be transformed into equivalent embodiments with equivalent changes. Therefore, without departing from the design spirit of the present invention, any simple modification, equivalent change or modification made to the above embodiments based on the essence of the technology of the present invention is within the scope of protection of the technical solution of the present invention.

Claims

1. A colored fiber, characterized in that: The colored fiber uses a polymer fiber as the base material, and arranges an inorganic flaky colored substance, or a mixture of an inorganic flaky colored substance and a dark substance in a manner parallel to the fiber axis, and embeds the inorganic flaky colored substance, or the mixture of the inorganic flaky colored substance and the dark substance inside the polymer fiber.

2. The colored fiber according to claim 1, wherein: The polymer fiber includes chemical fibers and natural fibers. Chemical fibers include regenerated fibers and synthetic fibers. The regenerated fibers include one or more of soybean fiber, cotton fiber, viscose fiber, modal fiber, bamboo pulp fiber; synthetic fibers include one or more of aromatic polyamide fiber, polyester fiber, polyamide fiber, polyacrylonitrile fiber, polyether fiber, polyurethane fiber, polyurethane fiber, polypropylene fiber, polyvinyl chloride fiber, polyvinyl alcohol fiber, polyvinyl acetal fiber, polyoxymethylene fiber, polyether ether ketone fiber, cuprammonium fiber, seaweed fiber, chitosan fiber, chitin fiber, cellulose acetate fiber, phosphorus-modified phenolic fiber; natural fibers include animal fibers and plant fibers. Animal fibers include one or more of wool and silk, and plant fibers include one or more of cotton, hemp, and avicell fiber. The inorganic flaky colored substance uses a flaky substance as the substrate, and a metal oxide layer is coated on its surface, and the metal oxide layer is 1-3 layers. The dark substance includes a mixture or complex of one or more of carbon black, vantablack, graphene, carbon nanotubes, and iron oxide black.

3. The colored fiber according to claim 2, wherein: The flaky substance includes one or more of glass flakes, natural mica, synthetic mica, Al2O3 flakes, TiO2 flakes, SiO2 flakes, Fe2O3 flakes, BiOCl flakes, and metal flakes. The metal oxide layer includes a mixture or complex of one or more of TiO2, SnO2, Fe2O3, Fe3O4, CoO, Co2O3, ZrO2, CrO3, SiO2, Al2O3, Al(OH)3, and MoS2.

4. The colored fiber according to claim 1, characterized in that: The thickness of the inorganic flaky colored substance is 0.2-2.5 μm, wherein the thickness of the flaky substance is 0.1-2 μm, and the thickness of the metal oxide layer is 3-900 nm.

5. The colored fiber according to claim 1, characterized in that: The fiber diameter is 5-500 μm.

6. The colored fiber according to claim 1, characterized in that: The content of the inorganic flaky colored substance is 1-30% of the mass fraction of the polymer, and the mass fraction of the dark substance in the mixture of the inorganic flaky colored substance and the dark substance is 1%-2%.

7. The method for preparing the colored fiber according to any one of claims 1-6, characterized in that: It includes the following steps: S1: Dissolve the polymer in a solvent, and perform secondary mixing with the inorganic flaky colored substance, or the mixture of the inorganic flaky colored substance and the dark substance at a specified temperature. S2: Filter the mixed solution to obtain a spinning solution. S3: The spinning solution is spun by solution spinning to prepare colored fibers.

8. The preparation method according to claim 7, characterized in that: In step S1, the polymer includes a mixture or complex of one or more of aromatic polyamide, polyester, polyamide, polyacrylonitrile, polyether, polyurethane, polyurethane, polypropylene, polyvinyl chloride, polyvinyl alcohol, polyvinyl acetal, polyoxymethylene, polyether ether ketone, cuprammonium, seaweed, chitosan, chitin, cellulose acetate, and phosphorus-modified phenolic.

9. The preparation method according to claim 7, characterized in that: In step S1, the solvent includes one or more of H2O, sodium thiocyanate, DMF, DMSO, DMAC, NMMO, NMP, DMA, acetone, acetic acid, trifluoroacetic acid, dichloromethane, zinc chloride hydrate, TEAOH, urea, dilute sulfuric acid, sodium sulfate, zinc sulfate, aluminum sulfate, boric acid, cuprammonium solution, sodium hydroxide solution, or a mixture or complex thereof; The temperature is 10 - 65 °C.

10. The preparation method according to claim 7, characterized in that: In step S3, the spinning process includes the steps of preparing a spinning dope, spinning, coagulating, stretching, washing with water, and drying; During the spinning process, spinning is carried out through a cylindrical spinneret; During the coagulation process, the running direction of the fiber is the same as the flowing direction of the coagulation bath solution; The temperature of the coagulation bath is between 10 - 90 °C.

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