Colorful flat fiber and preparation method thereof

Abstract

The invention discloses a colored flat fiber and a preparation method thereof. The colored flat 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 parallel with the wide surface of the fiber and embedded in the polymer fiber. The preparation 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 flat yarn. The preparation method disclosed by the invention is simple, and the fiber with good friction resistance, washing resistance, weather resistance, heat resistance, light stability and brighter color is synthesized.

Description

Technical Field

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

[0002] In recent years, the textile field has witnessed the continuous emergence of new fibers. Among them, the continuous innovation of fiber technology is particularly remarkable, laying a broad development path for the global textile and clothing industries. In the production process of chemical fibers, fibers with non-circular cross-sectional shapes are produced by changing the shape of the spinneret holes, and such fibers become profiled fibers. There are a wide variety of profiled fibers with various characteristics and other functions. Among them, the flat fiber cross-section has a unique style that cannot be replaced by other shaped fibers in terms of gloss, elasticity, anti-pilling property, fluffiness, hand feeling, and simulation effect.

[0003] CN 115787133 A relates to a method for preparing flat sea-island fibers from carbon fiber flat filaments. Before spinning, a chain extender is added online to the sea component melt, and then flat sea-island fibers are spun. This synthesis method requires that the temperature of the melt cannot be lower than 280 °C in the early stage of screw conveying, and the reaction conditions are relatively demanding, and the fiber is a raw color filament bundle.

[0004] CN 113913953 A relates to a method for preparing flat acrylic fibers. First, a polyacrylonitrile polymer stock solution is extruded from a specially treated rectangular hole spinneret into a coagulation bath, and primary fibers are obtained through double-diffusion coagulation forming; secondly, after washing with water and drawing, drying and densification are carried out; then heat setting is carried out; oiling, crimping and drying; the heat-treated fibers are successively impregnated with oil and crimped to endow post-spinning processing performance, thereby obtaining flat acrylic fibers. However, the flat acrylic fibers obtained by this synthesis method are raw color filament bundles.

[0005] In view of the fact that the existing flat fibers are raw color filament bundles, it is necessary to develop a colored flat fiber. Summary of the Invention

[0006] To solve the problems of the existing technology, the present invention provides a colored flat fiber and a preparation method thereof. The obtained fiber has bright colors, good light stability, weather resistance, washability, abrasion resistance, heat resistance, and high color saturation.

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

[0008] A colored flat fiber uses a polymer fiber as a base material, and an inorganic flaky colored substance, or a mixture of an inorganic flaky colored substance and a dark substance, is arranged parallel to the wide surface of the fiber and embedded inside the polymer fiber; the width of the fiber is 2-10 times the thickness, preferably 3-7 times.

[0009] Furthermore, the polymer fiber includes chemical fibers and natural fibers. Chemical fibers include regenerated fibers and synthetic fibers. 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, 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.

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

[0011] Furthermore, the flaky material 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] Furthermore, the thickness of the inorganic flaky colored substance is 0.2-2.5 μm, the thickness of the flaky material is 0.1-2 μm, and the thickness of the metal oxide layer is 5-900 nm. The thickness of the inorganic flaky colored substance is preferably 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] Furthermore, the width of the fiber is 5 - 500 μm, and the thickness is 1 - 200 μm. Preferably, the width of the fiber is 20 - 400 μm, and the thickness is preferably 4 - 150 μm.

[0016] Furthermore, 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% of the mass fraction of the polymer.

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

[0018] The preparation method of the above-mentioned colored flat fiber includes 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 substance at a specified temperature to obtain a mixed solution.

[0020] S2: Take out the mixed solution in S1, and quantitatively supply it to a filter by a metering pump for filtration to obtain a spinning solution.

[0021] S3: Spin the spinning solution through a solution spinning device to prepare the colored flat fiber.

[0022] Furthermore, in step S1, the polymer includes one or more of aromatic polyamide, polyester, polyamide, polyacrylonitrile, polyether, polyurethane, polyurethane, polypropylene, polyvinyl chloride, polyvinyl alcohol, polyvinyl acetal, polyformaldehyde, polyether ether ketone, cuprammonium, seaweed, chitosan, chitin, cellulose acetate, phosphorus-modified phenolic resin and other artificial fibers, natural fibers, or a mixture or composite thereof.

[0023] Furthermore, 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 composite thereof.

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

[0025] Furthermore, in step S1, the mixing method for uniformity is stirring.

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

[0027] Further, in step S3, during the spinning process, spinning is performed through a flat 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 calcium chloride aqueous solution, sodium thiocyanate aqueous solution, water and DMAC solution of calcium chloride, acetone, water, DMSO aqueous solution, sodium sulfate aqueous solution, mixed aqueous solution of dilute sulfuric acid, zinc sulfate, sodium sulfate, and aluminum sulfate, mixed aqueous solution of sodium sulfate and boric acid, sodium hydroxide aqueous 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, the polymer is dissolved in a solvent, stirred evenly, and then secondarily stirred with inorganic flaky colored substances or a mixture thereof with dark 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 flat spinneret for solidification and forming. It is introduced into a preheating bath tank through a winding roll, and preheating and stretching are performed at a preheating bath temperature of 25 - 90°C. The cellulose fiber bundle after being treated in the preheating bath is introduced into a water washing tank for water washing to remove impurities on the fiber. After water washing, the fiber bundle is subjected to processes such as drying to obtain a colored flat fiber.

[0032] A colored flat fiber and a preparation method thereof provided by the present invention, the material is based on a polymer fiber, and inorganic flaky colored substances or a mixture thereof with dark substances are arranged parallel to the wide surface of the fiber and embedded inside the polymer fiber, having good weather resistance, heat resistance, light stability and brighter colors; due to the relatively large specific surface area of the inorganic flaky colored substances and embedding them inside the fiber, the fiber has good abrasion resistance and washability.

[0033] The present invention provides a unique arrangement method in which inorganic flaky colored substances, or a mixture of inorganic flaky colored substances and dark substances are parallel to the wide surface of the fiber, making the utilization rate of inorganic flaky colored substances, or a mixture of inorganic flaky colored substances and dark substances higher, and making the color saturation of the synthetic fiber higher and the color brighter when observed from the wide surface.

[0034] Advantages of the present invention: The present invention prepares a new type of colored flat fiber by changing the shape of the spinneret. Using the wet spinning technique, inorganic flaky colored substances or mixtures thereof with dark substances are embedded inside the fiber to prepare flat fibers. The flat cross-section of this profiled fiber increases the reflection of light, making the fiber not only have extremely high color saturation, but also have gloss on its surface. Specifically, the friction resistance of this new type of colored fiber reaches the five-level standard, and it also performs excellently in terms of wash resistance, weather resistance, heat resistance, and light stability. Description of the Drawings

[0035] Figure 1 It is a microscope image of the sodium alginate flat 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 brighter color.

[0036] Figure 2 It is a microscope image of the polyacrylonitrile flat fiber obtained in Example 6 of the present invention. It can be seen from the figure that the fiber has a relatively high color saturation and a brighter color.

[0037] Figure 3 It is a microscope image of the poly(m-phenylene isophthalamide) flat fiber obtained in Example 9 of the present invention. It can be seen from the figure that the fiber has a relatively high color saturation and a brighter color.

[0038] Figure 4 It is a microscope image of the acetate flat fiber obtained in Example 13 of the present invention. It can be seen from the figure that the fiber has a relatively high color saturation and a brighter color.

[0039] Figure 5 It is a microscope image of the polypropylene flat fiber obtained in Example 14 of the present invention. It can be seen from the figure that the fiber has a relatively high color saturation and a brighter color.

[0040] Figure 6 It is a microscope image of the viscose flat fiber obtained in Example 21 of the present invention. It can be seen from the figure that the fiber has a relatively high color saturation and a brighter color.

[0041] Figure 7 It is a microscope image of the melamine formaldehyde flat fiber obtained in Example 26 of the present invention. It can be seen from the figure that the fiber has a relatively high color saturation and a brighter color.

[0042] Figure 8 It is a microscope image of the cross-section of the polyvinyl alcohol flat fiber obtained in Example 29 of the present invention. It can be seen from the figure that the fiber is a flat fiber. Detailed Embodiments

[0043] The technical solution of the present invention will be described below in conjunction with embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts belong to 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] 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. Then, an inorganic flaky colored substance with a mass fraction of 1% 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 consisted of a glass sheet as a substrate with 3 layers of TiO2 coated on its surface. The thickness of the glass sheet was 1 μm, the thickness of one layer of TiO2 was 900 nm, and the thickness of the inorganic flaky colored substance was 3.7 μm. The treated colored seaweed fiber spinning dope was quantitatively supplied by a metering pump, filtered by a filter, and pressed into a coagulation bath through a flat spinneret with a width of 500 μm and a thickness of 200 μm for coagulation and forming: 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 (downstream). 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.

[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 formaldehyde with a mass fraction of 0.5% relative to the seaweed was added. After it swelled and softened, sodium carbonate with a mass fraction of 1.5% 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. Then, inorganic flaky colored substances with a mass fraction of 1% relative to sodium alginate were added to 200 g of sodium alginate and stirred evenly to prepare a spinning solution; the inorganic flaky colored substances consisted of a glass sheet as a substrate, with 3 layers of TiO2 coated on its surface. The thickness of the glass sheet 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 treated 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 flat spinneret with a width of 30 μm and a thickness of 5 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 roll, and preheated and stretched at a preheating bath temperature of 50 °C. The cylindrical tow after preheating bath treatment 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] Sodium alginate was extracted by the acidification method. Seaweed with a mass fraction of 20% relative to water was soaked in water, and formaldehyde with a mass fraction of 0.5% relative to the seaweed was added. After it was swollen and softened, sodium carbonate with a mass fraction of 1.5% 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. Then, an inorganic flaky colored substance with a mass fraction of 1% 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 a metal sheet as the substrate, with a layer of SnO2 coated on its surface. The thickness of the metal sheet 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 processed 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 flat spinneret with a width of 300 μm and a thickness of 150 μm for solidification and forming: 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 take-up 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.

[0051] Example 4

[0052] Sodium alginate was extracted by the acidification method. Seaweed with a mass fraction of 20% relative to water was soaked in water, and formaldehyde with a mass fraction of 0.5% relative to the seaweed was added. After swelling and softening, sodium carbonate with a mass fraction of 1.5% 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. Then, an inorganic flaky colored substance with a mass fraction of 1% 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 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 substance was 0.2 μm. The treated 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 flat spinneret with a width of 500 μm and a thickness of 200 μm for coagulation and forming: 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 take-up roll, and preheated and stretched at a preheating bath temperature of 50 °C. The cylindrical tow after preheating bath treatment 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 then dried and densified in a dryer. The dried fiber was crimped by a crimper, and the crimping speed was 30 m / min.

[0053] Example 5

[0054] 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 30% relative to sodium polyacrylonitrile were added to 200 g of the polyacrylonitrile 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 the SnO2 layer was 400 nm, and the thickness of the inorganic flaky colored substances was 0.9 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 flat spinneret with a width of 200 μm and a thickness of 50 μm for coagulation and shaping: the coagulation bath was an aqueous sodium thiocyanate solution with a mass fraction of 14% relative to 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 sodium thiocyanate solution (co-current). After the shaped polyacrylonitrile fiber was cured in the cylindrical filament in the coagulation bath, it 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 the fiber was also washed. Subsequently, the fiber entered the next water wash to wash the solvent inside the fiber. Finally, a dryer was used for drying.

[0055] Example 6

[0056] 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 10% relative to sodium polyacrylonitrile were added to 200 g of the polyacrylonitrile 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 the Al(OH)3 layer was 150 nm, and the thickness of the inorganic flaky colored substances was 0.7 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 flat spinneret with a width of 30 μm and a thickness of 5 μm for coagulation and shaping: the coagulation bath was an aqueous sodium thiocyanate solution with a mass fraction of 9% relative to water, and the bath temperature was 10°C. After the cylindrical filament was cured in the coagulation bath, it 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 the fiber was also washed. Subsequently, the fiber entered the next water wash to wash the solvent inside the fiber. Finally, a dryer was used for drying.

[0057] Example 7

[0058] 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 10% relative to sodium polyacrylonitrile were added to 200 g of the polyacrylonitrile 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 flat spinneret with a width of 350 μm and a thickness of 100 μm for coagulation and forming: the coagulation bath was an aqueous solution of sodium thiocyanate with a mass fraction of 10% relative to water, and the bath temperature was 10 °C. In the coagulation bath, the cylindrical filaments were cured and then 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 fibers were stretched to a certain extent, and at the same time, the fibers were washed. Subsequently, the fibers entered the next water wash to wash the solvent inside the fibers. Finally, a dryer was used for drying.

[0059] Example 8

[0060] 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 5% 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; 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 the 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 flat spinneret with a width of 50 μm and a thickness of 5 μm for coagulation and forming: the coagulation bath was a solution with a volume 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 fibers was the same as the flowing direction of the coagulation bath solution (downstream). The formed poly(p-phenylene terephthalamide) fibers were introduced into a preheating bath through a take-up roller, and preheated and stretched at a bath temperature of 50 °C. The tow after the preheating bath treatment was introduced into a water wash tank for water washing to remove impurities on the fibers. After water washing, the tow was stretched in a stretching bath. The stretching ratio was 1:3, and the stretched fibers entered a dryer for drying and densification. The dried fibers were crimped by a crimper, and the crimping speed was 30 m / min.

[0061] Example 9

[0062] 100 g of poly(m-phenylene isophthalamide) with a molecular weight of 140,000 was added to 320 g of N,N-dimethylacetamide (DMAC) solvent and stirred evenly to prepare a poly(m-phenylene isophthalamide) solution. Subsequently, inorganic flaky colored substances with a mass fraction of 10% relative to the mass of poly(m-phenylene isophthalamide) were added to 200 g of the poly(m-phenylene isophthalamide) 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 flat spinneret with a width of 350 μm and a thickness of 100 μm for coagulation and forming: the coagulation bath was a solution with a volume 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 coagulation bath solution (downstream). The formed poly(p-phenylene terephthalamide) fiber was introduced into a preheating bath through a take-up roller for preheating and stretching at a bath temperature of 50 °C. The 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. The draw ratio was 1:2.5, and the stretched fiber entered a dryer for drying and densification. The dried fiber was crimped by a crimper at a crimping speed of 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 N,N-dimethylacetamide (DMAC) solvent and stirred evenly to prepare a poly(m-phenylene isophthalamide) solution. Subsequently, inorganic flaky colored substances with a mass fraction of 5% 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; the inorganic flaky colored substances were composed of a glass sheet as the substrate, with 3 layers of TiO₂ coated on its surface. The thickness of the glass sheet 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 through a filter, and pressed into a coagulation bath through a flat spinneret with a width of 20 μm and a thickness of 5 μm for coagulation and forming: the coagulation bath was a solution of H₂O:DMAC:CaCl₂ with a mixed volume ratio 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 coagulation bath solution (co-current). The formed poly(p-phenylene terephthalamide) fiber was introduced into a preheating bath through a take-up roller, 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 remove impurities on the fiber. The tow after water washing was stretched in a stretching bath. The stretching ratio was 1:2.5, 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 sodium thiocyanate solvent and stirred evenly to prepare a cellulose acetate solution. Subsequently, inorganic flaky colored substances with a mass fraction of 15% 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 were composed of a TiO₂ sheet as the substrate, with 2 layers of ZrO₂ coated on its surface. The thickness of the TiO₂ sheet 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 through a filter, and pressed into a coagulation bath through a flat spinneret with a width of 5 μm and a thickness of 1 μm for coagulation and forming: the coagulation bath was acetone, 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 (co-current). The formed cellulose acetate fiber was introduced into a preheating bath through a take-up roller, 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. The tow after water washing was stretched in a stretching bath. The stretching ratio was 1:2, and 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.

[0067] Example 12

[0068] 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 30% 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 were composed 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 flat spinneret with a width of 5 μm and a thickness of 1 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 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. After water washing, the tow was stretched in a stretching bath. The draw ratio was 1:2, and 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.

[0069] Example 13

[0070] 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 15% 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 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, 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 flat spinneret with a width of 30 μm and a thickness of 5 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 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. After water washing, the tow was stretched in a stretching bath. The draw ratio was 1:3, and 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.

[0071] Example 14

[0072] 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 were added to 200 g of the 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 flat spinneret with a width of 200 μm and a thickness of 50 μm for coagulation and forming: the coagulation bath was a 20% 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 polypropylene fiber was introduced into a preheating bath through a winding roll for preheating and stretching. The preheating bath was a 20% DMSO aqueous solution with respect to the mass fraction of water, and the bath temperature was 70 °C. The polypropylene tow after being treated in the preheating bath was introduced into a water washing bath for water washing to wash off the DMSO on the fiber. After water washing, the tow was stretched in a stretching bath, and the stretching ratio was 1:2.5. The stretched polypropylene fiber was dried and densified. The dried fiber was crimped by a crimper, and the crimping speed was 30 m / min.

[0073] Example 15

[0074] 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 20% relative to polypropylene were added to 200 g of the polypropylene solution and stirred evenly to make a spinning solution; the inorganic flaky colored substances were composed of SiO2 thin sheets as the substrate, with 3 layers of MOS2 coated on its surface. The thickness of the SiO2 thin sheets 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 flat spinneret with a width of 250 μm and a thickness of 50 μm for coagulation and forming: the coagulation bath was a 20% 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 polypropylene fiber was introduced into a preheating bath through a winding roll for preheating and stretching. The preheating bath was a 20% DMSO aqueous solution with respect to the mass fraction of water, and the bath temperature was 90 °C. The polypropylene tow after being treated in the preheating bath was introduced into a water washing bath for water washing to wash off the DMSO on the fiber. After water washing, the tow was stretched in a stretching bath, and the stretching ratio was 1:2.5. The stretched polypropylene fiber was dried and densified. The dried fiber was crimped by a crimper, and the crimping speed was 30 m / min.

[0075] Example 16

[0076] 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, an inorganic flaky colored substance with a mass fraction of 1% relative to polypropylene was added to 200 g of the polypropylene solution and stirred evenly to make a spinning solution; the inorganic flaky colored substance was composed 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 substance 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 flat spinneret with a width of 200 μm and a thickness of 50 μm for coagulation and forming: the coagulation bath was a 20% 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 polypropylene fiber was introduced into a preheating bath through a take-up roll for preheating and stretching. The preheating bath was a 20% DMSO aqueous solution with respect to the mass fraction of water, and the bath temperature was 60°C. The polypropylene tow after being treated in the preheating bath was introduced into a water washing tank for water washing to wash off the DMSO on the fiber. The tow after water washing was stretched in a stretching bath, and the stretching ratio was 1:2.5. The stretched polypropylene fiber was dried and densified. The dried fiber was crimped by a crimper, and the crimping speed was 30 m / min.

[0077] Example 17

[0078] 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 flat spinneret with a width of 350 μm and a thickness of 100 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. 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 winding roll, and preheated and stretched at a preheating temperature of 35 °C. The preheating bath was a 10% sodium sulfate aqueous solution. The cellulose tow after being treated in the preheating bath 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 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 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 flat spinneret with a width of 80 μm and a thickness of 20 μm for coagulation and forming: the coagulation bath was an aqueous sodium hydroxide solution with a mass fraction of 35% relative to water: absolute ethanol with a mixing volume ratio of 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.

[0081] Example 19

[0082] 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 flat spinneret with a width of 250 μm and a thickness of 50 μm for coagulation and forming: the coagulation bath was a solution mixed with an aqueous sodium hydroxide solution with a mass fraction of 10% relative to water and an aqueous sodium carbonate solution with a mass fraction of 15% relative to water. The mixing volume ratio of the aqueous sodium hydroxide solution and the aqueous sodium carbonate 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.

[0083] Example 20

[0084] 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 4% 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 a SiO2 thin sheet as a substrate, with 1 layer of CoO and 1 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 flat spinneret with a width of 200 μm and a thickness of 50 μm for coagulation 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 (downstream). The formed polyamide 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 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. The fiber bundle after water washing 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.

[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 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 thin flakes as the substrate, with 2 layers of Al2O coated on its surface. The thickness of the SiO2 thin flakes was 0.6 μm, the thickness of one layer of Al2O 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 flat spinneret with a width of 30 μm and a thickness of 5 μm for coagulation and shaping: the coagulation bath was a solution mixed with 2% dilute sulfuric acid with respect to water, 2% sodium sulfate aqueous solution with respect to water, 3% zinc sulfate aqueous solution with respect to water, and 3% aluminum sulfate aqueous solution with respect 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 consistent with the flowing direction of the coagulation bath solution (downstream). The formed viscose 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 viscose fiber bundle 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 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.

[0087] Example 22

[0088] 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 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 flat spinneret with a width of 300 μm and a thickness of 80 μm for coagulation and forming: the coagulation bath was a solution mixed with 2% dilute sulfuric acid with respect to water, 2% sodium sulfate aqueous solution with respect to water, 3% zinc sulfate aqueous solution with respect to water, and 3% aluminum sulfate aqueous solution with respect 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 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. The washed 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.

[0089] Example 23

[0090] 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 5% 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 a 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 flat spinneret with a width of 300 μm and a thickness of 80 μm for solidification and shaping: 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 winding 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 curled by a curling machine, and the curling speed was 30 m / min.

[0091] Example 24

[0092] 100 g of polyurethane with a molecular weight between 6,000 and 8,000 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 were composed of TiO2 flakes as the substrate, with 1 layer of Al2O and 1 layer of Fe3O4 coated on its surface. The thickness of the TiO2 flakes was 0.2 μm, the thickness of the Al2O 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 flat spinneret with a width of 350 μm and a thickness of 100 μm for solidification and shaping: 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 (downstream). The formed polyurethane fiber was introduced into a preheating bath through a take-up roll, 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. After water washing, the tow 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.

[0093] Example 25

[0094] 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 consisted 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 flat spinneret with a width of 350 μm and a thickness of 100 μm for solidification and forming. The coagulation bath was a solution mixed with a 15% sodium sulfate aqueous solution by mass fraction relative to water and a 10% boric acid aqueous solution by mass fraction relative 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 (co-current). The formed modified phenolic resin fiber was introduced into a preheating bath through a winding roll, 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 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 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.

[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 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 flat spinneret with a width of 30 μm and a thickness of 5 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 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.

[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 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 flat spinneret with a width of 50 μm and a thickness 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 (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 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 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 flat spinneret with a width of 500 μm and a thickness of 200 μm for coagulation and shaping: 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 winding roller, and preheated and stretched at a water bath temperature of 45 °C. The melamine formaldehyde fiber tow after preheating bath treatment was introduced into a water washing tank for water washing to wash away the impurities on the fiber. After water washing, the tow 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.

[0101] Example 29

[0102] 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, an inorganic flaky colored substance with a mass fraction of 5% relative to polyvinyl alcohol was added to 200 g of the polyvinyl alcohol solution and stirred evenly to make a spinning solution; the inorganic flaky colored substance consisted of a TiO2 thin sheet as the substrate, with 2 layers of ZrO2 coated on its surface. The thickness of the TiO2 thin sheet was 0.2 μm, the thickness of one layer of ZrO2 was 50 nm, and the thickness of the inorganic flaky colored substance 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 flat spinneret with a width of 30 μm and a thickness of 5 μm for coagulation and forming: the coagulation bath was a 15% aqueous barium chloride solution with respect 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 (downstream). The formed polyvinyl alcohol fiber was introduced into a preheating bath through a winding roller, and preheated and stretched at a water bath temperature of 90 °C. The polyvinyl alcohol 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 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.

[0103] Example 30

[0104] 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, an inorganic flaky colored substance with a mass fraction of 15% relative to poly(m-phenylene isophthalamide) was added to 200 g of the poly(m-phenylene isophthalamide) solution and stirred evenly to make a spinning solution; the inorganic flaky colored substance consisted of a SiO2 thin sheet as the substrate, with 2 layers of Al2O coated on its surface. The thickness of the SiO2 thin sheet was 0.6 μm, the thickness of one layer of Al2O was 200 nm, and the thickness of the inorganic flaky colored substance 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 flat spinneret with a width of 300 μm and a thickness of 80 μm for coagulation and forming: the coagulation bath was a 20% DMAC 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 poly(m-phenylene isophthalamide) fiber was introduced into a preheating bath through a winding roller, and preheated and stretched at a water bath temperature of 50 °C. The poly(m-phenylene isophthalamide) 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 poly(m-phenylene isophthalamide) fiber entered a dryer for drying and densification. The dried fiber was crimped by a crimper, and the crimping speed was 30 m / min.

[0105] Example 31

[0106] 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 the mass of 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 natural mica as the substrate, with 2 layers of ZrO2 coated on its surface. The thickness of the natural mica was 0.5 μm, the thickness of one layer of ZrO2 was 50 nm, and the thickness of the inorganic flaky colored substances was 0.6 μm. Subsequently, the spinning solution was quantitatively supplied by a metering pump, filtered by a filter, and pressed into a coagulation bath through a flat spinneret with a width of 200 μm and a thickness of 70 μm for coagulation and forming: the coagulation bath was a 5% sodium sulfate aqueous solution with respect to the mass 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 (downstream). After forming, the polyvinyl chloride fiber, after the cylindrical filament in the coagulation bath was appropriately cured, entered a hot water bath through a godet roller. The hot water bath temperature was controlled at 50°C and the draw ratio was 1:2, 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.

[0107] Example 32

[0108] 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 the mass of 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 flat spinneret with a width of 350 μm and a thickness of 100 μm for coagulation and forming: the coagulation bath was a 10% sodium hydroxide aqueous solution with respect to the mass 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 (downstream). After forming, the chitin fiber was introduced into a preheating bath through a take-up roller, and preheated and stretched at a water bath temperature of 50°C. The chitin fiber bundle after being treated in the preheating bath was introduced into a water wash tank 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 draw ratio was 1:3. After stretching, the fiber entered a dryer for drying and densification. After drying, the 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 20% 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 consisted of a substrate of Al2O3 flakes with a layer of Fe2O3 coated on its surface. The thickness of the Al2O3 flakes was 0.5 μm, the thickness of the Fe2O3 layer 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 flat spinneret with a width of 300 μm and a thickness of 80 μm for solidification and shaping: 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 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 1:3. 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 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 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 substrate of glass flakes with 3 layers of TiO2 coated on its surface. The thickness of the glass flakes was 1 μm, the thickness of the TiO2 layer 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 flat spinneret with a width of 350 μm and a thickness of 100 μm for solidification and shaping: 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 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 1:3. 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.

[0113] Example 35

[0114] 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 a SiO2 thin sheet as a substrate, with 1 layer of CoO and 1 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 flat spinneret with a width of 200 μm and a thickness of 50 μm for coagulation and forming: the coagulation bath was a 15% DMAC aqueous solution with a mass fraction relative to 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 (downstream). The formed polyamide fiber was introduced into a preheating bath through a take-up roller, and preheated and stretched at a water bath temperature of 25°C. The polyamide 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 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.

[0115] Example 36

[0116] 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, an inorganic flaky colored substance with a mass fraction of 20% relative to polyvinyl alcohol and carbon black with a mass fraction of 2% relative to 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 substance was composed of using natural mica as a substrate and coating 1 layer of SnO2 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 substance was 0.9 μm. Subsequently, the spinning solution was quantitatively supplied by a metering pump, filtered by a filter, and pressed into a coagulation bath through a flat spinneret with a width of 20 μm and a thickness of 5 μm for coagulation and shaping: the coagulation bath was an aqueous sodium sulfate solution with a mass fraction of 5% 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). After the formed polyvinyl alcohol fiber was appropriately cured in the coagulation bath, it entered a hot water bath through a godet roller. The hot water bath temperature was controlled at 30 °C and the speed ratio of the front and rear godet rollers 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 wash to wash the solvent inside the fiber. Finally, a dryer was used for drying.

[0117] Example 37

[0118] 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, an inorganic flaky colored substance with a mass fraction of 15% 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 the cellulose acetate solution and stirred evenly to make a spinning solution; the inorganic flaky colored substance was composed of using TiO2 flakes as a substrate and coating 2 layers of ZrO2 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 substance 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 flat spinneret with a width of 20 μm and a thickness of 5 μm for coagulation and shaping: 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). After the formed cellulose acetate fiber was introduced into a preheating bath through a take-up roller, the water bath temperature was 30 °C for preheating and stretching. The tow after being treated in the preheating bath was introduced into a water wash tank for water wash to wash away the impurities on the fiber. After water wash, the tow was stretched in a stretching bath, and the stretching ratio was 1:2. After stretching, the 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.

[0119] Example 38

[0120] Examples 2, 11, 21 and 29 were tested for light fastness on an AtlasXenoTest Alpha light fastness tester from SDL-Atalas, USA, in accordance with the method of AATCC TM16-2003, and rated using a grey scale for color change evaluation in accordance with GB250-1995; there was no obvious damage after 200 friction cycles; after 30 normal temperature washes, 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 flat fibers are based on polymer fibers, with inorganic flaky colored substances or mixtures thereof with dark substances arranged parallel to the wide surface of the fiber and embedded inside the polymer fibers. The characteristics are that the inorganic flaky colored substances have good light stability, weather resistance, and heat resistance, so that the color of the fiber has good weather resistance, heat resistance, light stability and brighter color; due to the relatively large specific surface area of the inorganic flaky colored substances and their embedding inside the fibers, the fibers have good 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 transformed into equivalent embodiments with equivalent changes. Therefore, without departing from the spirit of the design 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 flat fiber, characterized in that: The colored flat fiber uses a polymer fiber as the base material, and inorganic flaky colored substances, a mixture of inorganic flaky colored substances and a dark substance are arranged parallel to the wide surface of the fiber, and the inorganic flaky colored substances, or the mixture of inorganic flaky colored substances and the dark substance are embedded inside the polymer fiber; the width of the fiber is 2-10 times the thickness.

2. The colored flat fiber according to claim 1, wherein: The polymer fiber includes chemical fibers and natural fibers. Chemical fibers include regenerated fibers and synthetic fibers. Regenerated fibers include one or more of soybean fiber, cotton fiber, viscose fiber, modal fiber, and 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, and 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 material 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 one or more mixtures or complexes of carbon black, vantablack, graphene, carbon nanotubes, and iron oxide black.

3. The colored flat fiber according to claim 2, wherein: The flaky material 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 one or more mixtures or complexes of TiO2, SnO2, Fe2O3, Fe3O4, CoO, Co2O3, ZrO2, CrO3, SiO2, Al2O3, Al(OH)3, and MoS2.

4. The colored flat fiber according to claim 1, wherein: The thickness of the inorganic flaky colored substance is 0.2-2.5 μm, wherein the thickness of the flaky material is 0.1-2 μm, and the thickness of the metal oxide layer is 5-900 nm.

5. The colored flat fiber according to claim 1, wherein: The width of the fiber is 5-500 μm, and the thickness is 1-200 μm.

6. The colored flat 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 preparation method of the colored flat fiber according to any one of claims 1-6, characterized in that: 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: Spin the spinning solution by solution spinning to prepare a colored flat fiber.

8. The preparation method according to claim 7, characterized in that: In step S1, the polymer includes one or more mixtures or composites 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, phosphorus-modified phenolic resin.

9. According to claim 7, wherein: In step S1, the additives include 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 or their mixtures, or composites; 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 preparation of spinning dope, spinning, coagulation, drawing, washing, and drying processes; During the spinning process, spinning is carried out through a flat spinneret; During the coagulation process, the running direction of the fiber is the same as the flow direction of the coagulation bath solution; The temperature of the coagulation bath is between 10 - 90 °C.

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