High-saturation color fiber and preparation method thereof

Abstract

The invention discloses a high-saturation color fiber and a preparation method thereof. According to the high-saturation colored fiber, a mixture of a dark-color substance and a polymer fiber serves as an inner core, the outer portion of the inner core is coated with an inorganic sheet-shaped colored substance, the inorganic sheet-shaped colored substance and the polymer fiber are mixed, and the mixture is arranged in the mode parallel to the axial direction of the fiber to form a core-shell structure. The preparation method comprises the following steps: dissolving a polymer in a solvent, uniformly stirring, uniformly 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 an outer shaft spinning nozzle and an inner shaft spinning nozzle for coagulating and forming to obtain the core-shell structure colored tow. According to the invention, the color fiber with stronger controllability, full hand feeling and good rigidity can be obtained.

Description

Technical Field

[0001] The present invention relates to a high-saturation color fiber and a preparation method thereof, and more particularly to a high-saturation color fiber and a preparation method thereof, belonging to the technical field of color fibers. Background Art

[0002] Throughout the development of the fiber industry, the fiber structure has an important impact on it. The core-shell structure is a material composed of a core and a shell, and the core and the shell can be made of the same or different materials. By designing and preparing the core-shell structure. CN113388939A relates to a preparation method of a core-shell composite fluorescent fiber. The method is to mix a fluorescent polymer, an organic solvent and a volatile regulating solvent, and shake until the fluorescent polymer is fully dissolved to prepare a polymer solution; then use the polymer solution as a spinning solution for electrospinning, and receive it with a core fiber bundle to form a coating film on the surface of the core fiber bundle. However, the light stability, weather resistance and heat resistance of the fibers synthesized by this method are poor.

[0003] CN111945243B relates to a method for rapidly preparing polyurethane fibers by coaxial electrospinning. The method is to first prepare solution A (including polyether diol, catalyst and diluent) and solution B (including diisocyanate and diluent), inject solution A and solution B into syringe A and syringe B respectively, and then perform coaxial electrospinning to obtain polyurethane fibers. However, the original color fiber bundles obtained by this synthesis method.

[0004] Therefore, it is necessary to develop a core-shell structured color fiber with good light stability, weather resistance and heat resistance. Summary of the Invention

[0005] To solve the problems of the prior art, the present invention provides a high-saturation color fiber and a preparation method thereof, which have good light stability, weather resistance, wash resistance, friction resistance and heat resistance, and are more controllable, with a plump hand feeling and good rigidity.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] A high-saturation color fiber, which is a core-shell structured fiber, with a mixture of a dark substance and a polymer fiber as the core, and an outer coating layer is formed by coating a mixture of inorganic flaky colored substances and polymer fibers (the mixture of inorganic flaky colored substances and polymer fibers is the shell layer), and the inorganic flaky colored substances are arranged parallel to the fiber axis.

[0008] Furthermore, the polymer fibers include chemical fibers and natural fibers. The chemical fibers include regenerated fibers and synthetic fibers. The regenerated fibers include one or more of soybean fibers, cotton fibers, viscose fibers, modal fibers, and bamboo pulp fibers; the synthetic fibers include one or more of aromatic polyamide fibers, polyester fibers, polyamide fibers, polyacrylonitrile fibers, polyether fibers, polyurethane fibers, polypropylene fibers, polyvinyl chloride fibers, polyvinyl alcohol fibers, polyvinyl acetal fibers, polyoxymethylene fibers, polyether ether ketone fibers, cuprammonium fibers, seaweed fibers, chitosan fibers, chitin fibers, cellulose acetate fibers, and phosphorus-modified phenolic fibers; 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 fibers.

[0009] Furthermore, the dark substances include one or more mixtures or composites of carbon black, vantablack, graphene, carbon nanotubes, and iron oxide black.

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

[0011] Furthermore, the flaky materials include 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 one or more mixtures or composites of TiO2, SnO2, Fe2O3, Fe3O4, CoO, Co2O3, ZrO2, CrO3, SiO2, Al2O3, Al(OH)3, and MoS2.

[0013] Furthermore, the thickness of the flaky material is 0.1 - 2μm, and the thickness of the metal oxide layer is 5 - 900nm; the thickness of the inorganic flaky colored substance is 0.2 - 2.5μm. The thickness of the inorganic flaky colored substance is preferably 0.5 - 1.5μm, the thickness of the flaky substance is preferably 0.3 - 1.5μm, and the thickness of the metal oxide layer is preferably 40 - 600nm. The color presented changes with the thickness of the coated metal oxide layer.

[0014] Furthermore, the thickness of the coating layer of the mixture of the inorganic flaky colored substance layer and the polymer fibers is 2 - 200μm, and the thickness of the coating layer of the mixture of the inorganic flaky colored substance layer and the polymer fibers is preferably 20 - 150μm.

[0015] Furthermore, the diameter of the inner core fiber is 3-300 μm, wherein the diameter of the inner core fiber is preferably 10-250 μm.

[0016] Furthermore, the coating layer has a thickness of 2-200 μm, wherein the coating layer has a thickness of preferably 20-150 μm.

[0017] Furthermore, the content of the inorganic flaky colored substance is 1-30% of the mass fraction of the core-shell fiber, wherein the content of the inorganic flaky colored substance is preferably 4-20% of the mass fraction of the core-shell fiber.

[0018] Furthermore, the content of the dark substance in the mixture of the dark substance and the polymer fiber is 1%-2% of the mass fraction of the shell fiber.

[0019] The method for preparing the above-mentioned high-saturation color fiber comprises the following steps:

[0020] S1: dissolving the polymer in a solvent, mixing it with an inorganic flake colored substance at a specified temperature to obtain a uniform mixed solution, which is used as an inner axis spinning solution;

[0021] S2: dissolving the polymer and the dark substance at a specified temperature to obtain a uniform mixed solution, which is used as the external axis spinning solution;

[0022] S3: Infusing the inner-axis spinning solution into the inner-axis spinneret and the outer-axis spinning solution into the outer-axis spinneret for coaxial spinning to obtain highly saturated colored fibers.

[0023] Further, in steps S1 and S2, the polymer includes a mixture or composite of 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, polyetheretherketone fiber, cuprammonium fiber, seaweed fiber, chitosan fiber, chitin fiber, cellulose acetate fiber, phosphorus-modified phenolic fiber, artificial fiber, and natural fiber.

[0024] Further, in steps S1 and S2, the solvent includes a mixture or complex of one or more of H2O, sodium thiocyanate, NN-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 salt hydrate, tetraethylammonium hydroxide (TEAOH), urea, dilute sulfuric acid, sodium sulfate, zinc sulfate, aluminum sulfate, boric acid, cuprammonia solution, and sodium hydroxide solution.

[0025] Further, the inner-axis spinning solution and the outer-axis spinning solution are first filtered and then spun.

[0026] Further, in steps S1 and S2, the way of mixing evenly is stirring.

[0027] Further, in step S3, the spinning process includes processes of spinning, coagulation, drawing, water washing, and drying.

[0028] Further, in step S3, the diameter of the inner-axis spinneret is 3 - 300 μm, and the diameter of the outer-axis spinneret is 5 - 500 μm.

[0029] Further, in step S3, the coaxial spinning includes coaxial solution spinning or coaxial electrospinning.

[0030] 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, aqueous solution of calcium chloride and DMAC, 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.

[0031] 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 (in the same direction).

[0032] Further, in step S3, the spinning process further includes a series of processes such as hot drawing, heat setting, and winding.

[0033] Further, the polymer is dissolved in a solvent, stirred evenly, and then inorganic flaky colored substances or dark substances are added respectively for stirring. After mixing, a mixed solution is obtained, which is quantitatively supplied to a filter by a metering pump for filtration, and is respectively used as the outer-axis spinning solution and the inner-axis spinning solution, and is pressed into the coagulation bath through the outer and inner-axis spinnerets for solidification and forming. It is introduced into a preheating bath tank through a take-up roller, and preheated and stretched at a preheating bath temperature of 25 - 90 °C. The cellulose tow after being treated in the preheating bath is introduced into a water washing tank for water washing to wash away the impurities on the fiber. After water washing, the tow is dried and other processes to obtain a high-saturation tow.

[0034] A high-saturation color fiber provided by the present invention and its preparation method. The material uses a mixture of a dark substance and a polymer fiber as the core, thereby making the saturation of the fiber color higher; an inorganic flaky colored substance and a polymer fiber mixture are coated on the outside to form a core-shell structure, and the inorganic flaky colored substances coated on the outside are arranged in a manner parallel to the fiber axis. This arrangement makes the fiber color brighter; by introducing inorganic flaky colored substances, the fiber color has good weather resistance, heat resistance, and light stability; and it is evenly embedded in the polymer to make the fiber have good abrasion resistance and washability.

[0035] Advantages of the present invention: The high-saturation color fiber provided by the present invention is a core-shell structure color fiber with good abrasion resistance, washability, weather resistance, heat resistance, light stability, brighter color, and higher saturation. The present invention has a unique core-shell structure, and the shell layer fiber acts as a protective layer and plays a crucial barrier role, which can comprehensively protect the safety and stability of the core, improve the mechanical properties of the fiber, and can also improve the controllability of the fiber, and has a plump hand feeling and good rigidity. The uniqueness of the present invention lies in that a mixture of an inorganic flaky colored substance and a polymer fiber is used as the shell layer fiber, and a mixture of a dark substance and a polymer fiber is used as the core, and a more brightly colored, more controllable, and plump-handed color fiber is synthesized by coaxial spinning, which has broad application prospects. Brief Description of the Drawings

[0036] Figure 1 It is a schematic diagram of the high-saturation color fiber of the present invention.

[0037] Figure 2 It is a 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 color has a relatively high saturation and is relatively bright.

[0038] Figure 3 It is a microscope image of the polypropylene fiber obtained in Example 15 of the present invention. It can be seen from the figure that the fiber color has a relatively high saturation and is relatively bright.

[0039] Figure 4 It is a 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 color has a relatively high saturation and is relatively bright.

[0040] Figure 5 It is a microscope image of the polyvinyl chloride fiber obtained in Example 33 of the present invention. It can be seen from the figure that the fiber color has a relatively high saturation and is relatively bright. Detailed Embodiments

[0041] 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 the embodiments. 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 protection scope of the present invention.

[0042] 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.

[0043] Example 1

[0044] 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 obtain an outer shaft spinning solution for perfusion into an outer shaft spinneret; the inorganic flaky colored substance was composed 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. Carbon black with a mass fraction of 1% relative to polyacrylonitrile was added to 200 g of the treated polyacrylonitrile spinning solution and stirred evenly to obtain an inner shaft spinning precursor solution, which was used for perfusion into the inner shaft spinneret. Subsequently, the spinning solution was quantitatively supplied by a metering pump, filtered by a filter, and pressed into a coagulation bath through an outer shaft spinneret with a diameter of 500 μm and an inner shaft spinneret with a diameter of 300 μm for solidification and shaping: the coagulation bath was an aqueous solution of sodium thiocyanate 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 (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 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.

[0045] Example 2

[0046] 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 added to 300 g of water, and then 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 obtain an outer shaft spinning solution, which was used for perfusion into the outer shaft spinneret; the inorganic flaky colored substance was composed of a natural mica 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. 2% graphene with a mass fraction relative to sodium alginate was added to 200 g of sodium alginate spinning solution and stirred evenly to obtain an inner shaft spinning precursor solution, which was used for perfusion into the inner shaft spinneret. Subsequently, the spinning solution was quantitatively supplied by a metering pump and filtered by a filter, and then pressed into a coagulation bath through an outer shaft spinneret with a diameter of 150 μm and an inner shaft spinneret with a diameter of 100 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 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.

[0047] Example 3

[0048] 100 g of polyurethane with a molecular weight between 6000 and 8000 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 obtain an outer shaft spinning solution, which was used for perfusion into the outer shaft spinneret; the inorganic flaky colored substances consisted of a substrate of Fe2O3 flakes 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. 1% of vantablack relative to the mass of the polyurethane was added to 200 g of the polyurethane spinning solution and stirred evenly to obtain an inner shaft spinning precursor solution, which was used for perfusion into the inner shaft spinneret. Subsequently, the spinning solution was quantitatively supplied by a metering pump, filtered by a filter, and pressed into a coagulation bath through an outer shaft spinneret with a diameter of 100 μm and an inner shaft spinneret with a diameter of 30 μm for solidification and shaping: the coagulation bath was a 15% DMAC aqueous solution relative 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 (co-current). The formed polyamide fiber was introduced into a preheating bath through a winding roller and preheated at a preheating temperature of 40°C for pre-stretching. The polyurethane fiber tow 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 tow was stretched in a stretching bath, and the stretching ratio was 1:2.5. The stretched polyurethane fiber entered a dryer for drying and densification. The dried fiber was crimped by a crimper, and the crimping speed was 30 m / min.

[0049] Example 4

[0050] 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 obtain an outer-axis spinning solution, which was used for perfusion into the outer-axis spinneret; the inorganic flaky colored substances consisted 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, and the thickness of one layer of Al(OH)3 was 150 nm. The thickness of the inorganic flaky colored substances was 0.7 μm. 2% carbon black relative to the mass of the polyamide was added to 200 g of the polyamide solution and stirred evenly to obtain an inner-axis spinning precursor solution, which was used for perfusion into the inner-axis spinneret. Subsequently, the spinning solution was quantitatively supplied by a metering pump, filtered by a filter, and pressed into a coagulation bath through an outer-axis spinneret with a diameter of 200 μm and an inner-axis spinneret with a diameter of 50 μm for coagulation and forming: the coagulation bath was a 10% DMAC aqueous solution relative to the mass 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 (downstream). The formed polyamide fiber was introduced into a preheating bath through a take-up roll and preheated and stretched at a preheating temperature of 60 °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. The washed 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.

[0051] Example 5

[0052] 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, 15% by mass of inorganic flaky colored substances relative to the polyester was added to 200 g of the polyester solution and stirred evenly to obtain an outer shaft spinning solution, which was used for perfusion into the outer shaft spinneret; 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. 1% by mass of carbon nanotubes relative to the polyester was added to 200 g of the polyester solution and stirred evenly to obtain an inner shaft spinning precursor solution, which was used for perfusion into the inner shaft spinneret. Subsequently, the spinning solution was quantitatively supplied by a metering pump to a filter for filtration, and then pressed into a coagulation bath through an outer shaft spinneret with a diameter of 5 μm and an inner shaft spinneret with a diameter of 3 μm for coagulation and forming: the coagulation bath was a solution obtained by mixing a 10% by mass aqueous sodium hydroxide solution relative to water and a 15% by mass aqueous sodium carbonate solution relative to water, and the volume ratio of the aqueous sodium hydroxide solution to the aqueous sodium carbonate 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 (co-current). The formed polyester fiber was introduced into a preheating bath through a winding roller, and preheated and stretched at a preheating temperature of 50 °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. The fiber bundle after water washing 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.

[0053] Example 6

[0054] 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, 10% by mass of inorganic flaky colored substances relative to the chitosan was added to 200 g of the chitosan solution and stirred evenly to obtain an outer shaft spinning solution, which was used for perfusion into the outer shaft spinneret; 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. 2% by mass of carbon black relative to the chitosan was added to 200 g of the chitosan solution and stirred evenly to obtain an inner shaft spinning precursor solution, which was used for perfusion into the inner shaft spinneret. Subsequently, the spinning solution was quantitatively supplied by a metering pump to a filter for filtration, and then chitosan fibers were prepared through a coaxial electrospinning device with an outer shaft spinneret with a diameter of 150 μm, an inner shaft spinneret with a diameter of 50 μm, and a spinning voltage of 22 kV.

[0055] Example 7

[0056] 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, 200 g of iron oxide black, an inorganic flaky colored substance with a mass fraction of 25% relative to methyl cellulose, was added to the methyl cellulose solution and stirred evenly to obtain an outer shaft spinning solution, which was used for perfusion into the outer shaft spinneret; the inorganic flaky colored substance consisted of a metal sheet as the substrate with 2 layers of ZrO2 coated on its surface. The thickness of the metal 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. 2% of the mass fraction relative to methyl cellulose was added to 200 g of methyl cellulose solution and stirred evenly to obtain an inner shaft spinning precursor solution, which was used for perfusion into the inner shaft spinneret. Subsequently, the spinning solution was quantitatively supplied by a metering pump, filtered by a filter, and pressed into a coagulation bath through an outer shaft spinneret with a diameter of 20 μm and an inner shaft spinneret with a diameter of 10 μm for coagulation and shaping: 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 take-up roller and preheated and stretched at a preheating temperature of 35 °C. The preheating bath was a 10% sodium sulfate aqueous solution by mass fraction relative to water. The cellulose tow after preheating bath treatment was introduced into a water washing tank 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.

[0057] Example 8

[0058] 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 obtain an outer shaft spinning solution, which was used for perfusion into the outer shaft spinneret; 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. 1% carbon black relative to the mass of polypropylene was added to 200 g of the polypropylene solution and stirred evenly to obtain an inner shaft spinning precursor solution, which was used for perfusion into the inner shaft spinneret. Subsequently, the spinning solution was quantitatively supplied by a metering pump, filtered by a filter, and pressed into a coagulation bath through an outer shaft spinneret with a diameter of 500 μm and an inner shaft spinneret with a diameter of 300 μm for solidification 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 polypropylene fiber was introduced into a preheating bath through a winding 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 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. 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 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.

[0059] Example 9

[0060] 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 5% relative to cellulose acetate were added to 200 g of the cellulose acetate solution and stirred evenly to obtain an outer shaft spinning solution, which was used for perfusion into the outer shaft spinneret; the inorganic flaky colored substances were composed of a SiO2 thin sheet as the 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. 1% graphene relative to the mass of cellulose acetate was added to 200 g of the cellulose acetate solution and stirred evenly to obtain an inner shaft spinning precursor solution, which was used for perfusion into the inner shaft spinneret. Subsequently, the spinning solution was quantitatively supplied by a metering pump, filtered by a filter, and pressed into a coagulation bath through an outer shaft spinneret with a diameter of 400 μm and an inner shaft spinneret with a diameter of 100 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 preheated and stretched at a bath temperature of 60 °C. The cellulose acetate 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 was 1:2, 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.

[0061] Example 10

[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 15% relative to the poly(m-phenylene isophthalamide) were added to 200 g of the poly(m-phenylene isophthalamide) solution and stirred evenly to obtain an outer shaft spinning solution, which was used for perfusion into the outer shaft spinneret; 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. 1% graphene relative to the mass of poly(m-phenylene isophthalamide) was added to 200 g of the poly(m-phenylene isophthalamide) solution and stirred evenly to obtain an inner shaft spinning precursor solution, which was used for perfusion into the inner shaft spinneret. Subsequently, the spinning solution was quantitatively supplied by a metering pump, filtered by a filter, and pressed into a coagulation bath through an outer shaft spinneret with a diameter of 50 μm and an inner shaft spinneret with a diameter of 30 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 flow 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 remove 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.

[0063] Example 11

[0064] 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 obtain an outer shaft spinning solution, which was used for perfusion into the outer shaft spinneret; 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. 1% of carbon nanotubes relative to the mass of cellulose acetate were added to 200 g of the cellulose acetate solution and stirred evenly to obtain an inner shaft spinning precursor solution, which was used for perfusion into the inner shaft spinneret. Subsequently, the spinning solution was quantitatively supplied by a metering pump, filtered by a filter, and pressed into a coagulation bath through an outer shaft spinneret with a diameter of 100 μm and an inner shaft spinneret with a diameter of 50 μm for solidification and forming: the coagulation bath was acetone, 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 (downstream). The formed cellulose acetate fiber was introduced into a preheating bath through a winding 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, and the tow after water washing 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.

[0065] Example 12

[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 obtain an outer shaft spinning solution, which was used for perfusion into the outer shaft spinneret; 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. 2% iron oxide black with respect to the mass of cellulose acetate was added to 200 g of the cellulose acetate solution and stirred evenly to obtain an inner shaft spinning precursor solution, which was used for perfusion into the inner shaft spinneret. Subsequently, the spinning solution was quantitatively supplied by a metering pump, filtered by a filter, and pressed into a coagulation bath through an outer shaft spinneret with a diameter of 200 μm and an inner shaft spinneret with a diameter of 50 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 (co-current). The formed cellulose acetate fiber was introduced into a preheating bath through a take-up roll, and the bath temperature was 30°C for preheating and stretching. 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 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.

[0067] Example 13

[0068] 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 obtain an outer shaft spinning solution, which was used for perfusion into the outer shaft spinneret; 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. Ferric oxide black with a mass fraction of 1% relative to polypropylene was added to 200 g of the polypropylene solution and stirred evenly to obtain an inner shaft spinning precursor solution, which was used for perfusion into the inner shaft spinneret. Subsequently, the spinning solution was quantitatively supplied by a metering pump, filtered by a filter, and pressed into a coagulation bath through an outer shaft spinneret with a diameter of 150 μm and an inner shaft spinneret with a diameter of 50 μm for coagulation and forming: the coagulation bath was a 20% DMSO aqueous solution with a 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 flow 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 with a mass fraction relative to water, and the bath temperature was 65°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. 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.

[0069] Example 14

[0070] 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 obtain an outer shaft spinning solution, which was used for perfusion into the outer shaft spinneret; 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. 2% of carbon nanotubes relative to the mass of polypropylene were added to 200 g of the polypropylene solution and stirred evenly to obtain an inner shaft spinning precursor solution, which was used for perfusion into the inner shaft spinneret. Subsequently, the spinning solution was quantitatively supplied by a metering pump, filtered by a filter, and pressed into a coagulation bath through an outer shaft spinneret with a diameter of 300 μm and an inner shaft spinneret with a diameter of 100 μm for solidification and shaping: 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 flow direction of the DMSO aqueous 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 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. 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.

[0071] Example 15

[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 1% relative to polypropylene were added to 200 g of the polypropylene solution and stirred evenly to obtain an outer shaft spinning solution, which was used for perfusion into the outer shaft spinneret; the inorganic flaky colored substances consisted 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. 1% of vantablack relative to polypropylene was added to 200 g of the polypropylene solution and stirred evenly to obtain an inner shaft spinning precursor solution, which was used for perfusion into the inner shaft spinneret. Subsequently, the spinning solution was quantitatively supplied by a metering pump, filtered by a filter, and pressed into a coagulation bath through an outer shaft spinneret with a diameter of 200 μm and an inner shaft spinneret with a diameter of 100 μm for coagulation and forming: the coagulation bath was a 20% DMSO aqueous solution with a 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 aqueous 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 a mass fraction relative to water, and the bath temperature was 65°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 entered a dryer for drying and densification. The dried fiber was crimped by a crimper, and the crimping speed was 30 m / min.

[0073] Example 16

[0074] 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 obtain an outer-axis spinning solution, which was used for perfusion into the outer-axis spinneret; the inorganic flaky colored substances consisted of Al2O3 thin sheets as the substrate, with 2 layers of Fe2O3 coated on its surface. The thickness of the Al2O3 thin sheets 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. 2% graphene relative to the mass of methyl cellulose was added to 200 g of the methyl cellulose solution and stirred evenly to obtain an inner-axis spinning precursor solution, which was used for perfusion into the inner-axis spinneret. Subsequently, the spinning solution was quantitatively supplied by a metering pump, filtered by a filter, and pressed into a coagulation bath through an outer-axis spinneret with a diameter of 50 μm and an inner-axis spinneret with a diameter of 10 μm for solidification and forming: the coagulation bath was a solution mixed with 7.5% sulfuric acid relative to the mass of water and 10% sodium sulfate aqueous solution relative to the mass of 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 washing bath for washing to remove impurities on the fiber. The tow after 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.

[0075] Example 17

[0076] 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 obtain an outer-axis spinning solution, which was used for perfusion into the outer-axis spinneret; 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. 1% graphene with a mass fraction relative to chitosan was added to 200 g of the chitosan solution and stirred evenly to obtain an inner-axis spinning precursor solution, which was used for perfusion into the inner-axis spinneret. Subsequently, the spinning solution was quantitatively supplied by a metering pump, filtered by a filter, and pressed into a coagulation bath through an outer-axis spinneret with a diameter of 200 μm and an inner-axis spinneret with a diameter of 100 μm for solidification and forming: the coagulation bath was a solution of 35% sodium hydroxide aqueous solution and absolute ethanol mixed relative to water, and the volume ratio of the sodium hydroxide aqueous solution to absolute ethanol was 5:5, 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 chitosan 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 chitosan tow after preheating bath treatment 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. 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.

[0077] Example 18

[0078] 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 the polyester were added to 200 g of the polyester solution and stirred evenly to obtain an outer shaft spinning solution, which was used for perfusion into the outer shaft spinneret; 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. Carbon black with a mass fraction of 2% relative to the polyester was added to 200 g of the polyester solution and stirred evenly to obtain an inner shaft spinning precursor solution, which was used for perfusion into the inner shaft spinneret. Subsequently, the spinning solution was quantitatively supplied by a metering pump, filtered by a filter, and pressed into a coagulation bath through an outer shaft spinneret with a diameter of 5 μm and an inner shaft spinneret with a diameter of 3 μm for solidification and forming: the coagulation bath was a solution mixed with a 5% sodium hydroxide aqueous solution by mass fraction relative to water and a 10% sodium carbonate aqueous solution by 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 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 winding 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 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. 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.

[0079] Example 19

[0080] 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 obtain an outer shaft spinning solution, which was used for perfusion into the outer shaft spinneret; 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. 1% carbon black relative to the mass fraction of the polyamide was added to 200 g of the polyamide solution and stirred evenly to obtain an inner shaft spinning precursor solution, which was used for perfusion into the inner shaft spinneret. Subsequently, the spinning solution was quantitatively supplied by a metering pump, filtered by a filter, and pressed into a coagulation bath through an outer shaft spinneret with a diameter of 10 μm and an inner shaft spinneret with a diameter of 3 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 consistent with the flowing direction of the coagulation bath solution (downstream). The formed polyamide fiber was introduced into a preheating bath through a winding roller 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. The washed 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.

[0081] Example 20

[0082] 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 obtain an outer-axis spinning solution, which was used for perfusion into an outer-axis spinneret; the inorganic flaky colored substances consisted of SiO2 thin sheets as the substrate, with 2 layers of Al2O3 coated on its surface. The thickness of the SiO2 thin sheets 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. 1% iron oxide black with a mass fraction relative to the viscose was added to 200 g of the viscose fiber solution and stirred evenly to obtain an inner-axis spinning precursor solution, which was used for perfusion into the inner-axis spinneret. Subsequently, the spinning solution was quantitatively supplied by a metering pump, filtered by a filter, and pressed into a coagulation bath through an outer-axis spinneret with a diameter of 500 μm and an inner-axis spinneret with a diameter of 300 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.

[0083] Example 21

[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 25% relative to the viscose were added to 200 g of the viscose solution and stirred evenly to obtain an outer-axis spinning solution, which was used for perfusion into the outer-axis spinneret; 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. 1% of vantablack relative to the viscose was added to 200 g of the viscose fiber solution and stirred evenly to obtain an inner-axis spinning precursor solution, which was used for perfusion into the inner-axis spinneret. Subsequently, the spinning solution was quantitatively supplied by a metering pump, filtered by a filter, and pressed into a coagulation bath through an outer-axis spinneret with a diameter of 50 μm and an inner-axis spinneret with a diameter of 30 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 crimped by a crimper, and the crimping speed was 30 m / min.

[0085] Example 22

[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 5% relative to the viscose were added to 200 g of the viscose solution and stirred evenly to obtain an outer shaft spinning solution, which was used for perfusion into the outer shaft spinneret; the inorganic flaky colored substances were composed 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. 2% graphene relative to the mass of the viscose was added to 200 g of the viscose fiber solution and stirred evenly to obtain an inner shaft spinning precursor solution, which was used for perfusion into the inner shaft spinneret. Subsequently, the spinning solution was quantitatively supplied by a metering pump, filtered by a filter, and pressed into a coagulation bath through an outer shaft spinneret with a diameter of 200 μm and an inner shaft spinneret with a diameter of 50 μm for solidification and shaping: the coagulation bath was a solution mixed with 2% dilute sulfuric acid relative to water, 2% sodium sulfate aqueous solution relative to water, 3% zinc sulfate aqueous solution relative to water, and 3% aluminum sulfate aqueous solution 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 flow 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 crimped by a crimper, and the crimping speed was 30 m / min.

[0087] Example 23

[0088] 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 obtain an outer shaft spinning solution, which was used for perfusion into the outer shaft spinneret; the inorganic flaky colored substances consisted of TiO2 flakes as the substrate, with a layer of Al2O3 and a layer of Fe3O4 coated on its surface. The thickness of the TiO2 flakes was 0.2 μm, the thickness of the Al2O3 layer was 200 nm, and the thickness of the Fe3O4 layer was 300 nm. The thickness of the inorganic flaky colored substances was 0.7 μm. 1% graphene relative to the mass of the polyurethane was added to 200 g of the polyurethane solution and stirred evenly to obtain an inner shaft spinning precursor solution, which was used for perfusion into the inner shaft spinneret. Subsequently, the spinning solution was quantitatively supplied by a metering pump, filtered by a filter, and pressed into a coagulation bath through an outer shaft spinneret with a diameter of 200 μm and an inner shaft spinneret with a diameter of 100 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 (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.

[0089] Example 24

[0090] 130 g of modified phenolic resin with a molecular weight between 3000 and 5000 was added to 260 g of acetone 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 obtain an outer-axis spinning solution, which was used for perfusion into the outer-axis spinneret; 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. 1% of carbon nanotubes relative to the mass of the modified phenolic resin were added to 200 g of the modified phenolic resin solution and stirred evenly to obtain an inner-axis spinning precursor solution, which was used for perfusion into the inner-axis spinneret. Subsequently, the spinning solution was quantitatively supplied by a metering pump, filtered by a filter, and pressed into a coagulation bath through an outer-axis spinneret with a diameter of 5 μm and an inner-axis spinneret with a diameter of 3 μm for coagulation and forming: the coagulation bath was a solution mixed with a 15% sodium sulfate aqueous solution relative to the mass of water and a 10% boric acid aqueous solution relative to the mass of 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 consistent with the flowing direction of the coagulation bath solution (downstream). The formed modified phenolic resin fiber was introduced into a preheating bath through a winding 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 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 curled by a curling machine, and the curling speed was 30 m / min.

[0091] Example 25

[0092] 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 obtain an outer shaft spinning solution, which was used for perfusion into the outer shaft spinneret; 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, and the thickness of one layer of MoS2 was 120 nm. The thickness of the inorganic flaky colored substances was 1 μm. 1% of carbon nanotubes relative to the mass of melamine formaldehyde were added to 200 g of the melamine formaldehyde solution and stirred evenly to obtain an inner shaft spinning precursor solution, which was used for perfusion into the inner shaft spinneret. Subsequently, the spinning solution was quantitatively supplied by a metering pump, filtered by a filter, and pressed into a coagulation bath through an outer shaft spinneret with a diameter of 10 μm and an inner shaft spinneret with a diameter of 3 μm for solidification and forming: the coagulation bath was a 10% sodium sulfate aqueous solution relative to the mass of water, and the bath temperature was 30 °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 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 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 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.

[0093] Example 26

[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 30% relative to melamine formaldehyde were added to 200 g of the melamine formaldehyde solution and stirred evenly to obtain an outer-axis spinning solution, which was used for perfusion into the outer-axis spinneret; the inorganic flaky colored substances were composed of TiO2 thin sheets as the substrate, with 3 layers of Fe3O4 coated on its surface. The thickness of the TiO2 thin sheets 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. 1% carbon black relative to melamine formaldehyde was added to 200 g of the melamine formaldehyde solution and stirred evenly to obtain an inner-axis spinning precursor solution, which was used for perfusion into the inner-axis spinneret. Subsequently, the spinning solution was quantitatively supplied by a metering pump, filtered by a filter, and pressed into a coagulation bath through an outer-axis spinneret with a diameter of 150 μm and an inner-axis spinneret with a diameter of 50 μm for solidification and forming: the coagulation bath was a 10% sodium sulfate aqueous solution by mass fraction 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 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 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 27

[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 10% relative to melamine formaldehyde were added to 200 g of the melamine formaldehyde solution and stirred evenly to obtain an outer-axis spinning solution, which was used for perfusion into the outer-axis spinneret; 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. 1% of carbon nanotubes was added to 15% of the melamine formaldehyde solution and stirred evenly to obtain an inner-axis spinning precursor solution, which was used for perfusion into the inner-axis spinneret. Subsequently, the spinning solution was quantitatively supplied by a metering pump, filtered by a filter, and pressed into a coagulation bath through an outer-axis spinneret with a diameter of 200 μm and an inner-axis spinneret with a diameter of 100 μm for solidification and shaping: the coagulation bath was a 10% sodium sulfate 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 consistent with the flowing direction of the coagulation bath solution (downstream). 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 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 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 28

[0098] 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 4% relative to polyvinyl alcohol was added to 200 g of the polyvinyl alcohol solution and stirred evenly to obtain an outer shaft spinning solution, which was used for perfusion into the outer shaft spinneret; the inorganic flaky colored substance was composed 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. 1% of vantablack relative to polyvinyl alcohol was added to 200 g of the polyvinyl alcohol solution and stirred evenly to obtain an inner shaft spinning precursor solution, which was used for perfusion into the inner shaft spinneret. Subsequently, the spinning solution was quantitatively supplied by a metering pump, filtered by a filter, and pressed into a coagulation bath through an outer shaft spinneret with a diameter of 300 μm and an inner shaft spinneret with a diameter of 100 μm for solidification and shaping: the coagulation bath was a 15% aqueous barium chloride solution by mass fraction relative to water, and the bath temperature was 35 °C. In the coagulation bath, the running direction of the fiber was consistent with the flow 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 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. 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.

[0099] Example 29

[0100] 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 poly(m-phenylene isophthalamide) were added to 200 g of the poly(m-phenylene isophthalamide) solution and stirred evenly to obtain an outer shaft spinning solution, which was used for perfusion into the outer shaft spinneret; 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. 1% graphene relative to the mass of poly(m-phenylene isophthalamide) was added to 200 g of the poly(m-phenylene isophthalamide) solution and stirred evenly to obtain an inner shaft spinning precursor solution, which was used for perfusion into the inner shaft spinneret. Subsequently, the spinning solution was quantitatively supplied by a metering pump, filtered by a filter, and pressed into a coagulation bath through an outer shaft spinneret with a diameter of 5 μm and an inner shaft spinneret with a diameter of 3 μm for coagulation and forming: the coagulation bath was a 20% DMAC aqueous solution by 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 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 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-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.

[0101] Example 30

[0102] 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 obtain an outer-axis spinning solution, which was used for perfusion into the outer-axis spinneret; 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. 2% graphene relative to the mass of polyvinyl chloride was added to 200 g of the polyvinyl chloride solution and stirred evenly to obtain an inner-axis spinning precursor solution, which was used for perfusion into the inner-axis spinneret. Subsequently, the spinning solution was quantitatively supplied by a metering pump, filtered by a filter, and pressed into a coagulation bath through an outer-axis spinneret with a diameter of 100 μm and an inner-axis spinneret with a diameter of 30 μm for solidification 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 chloride fiber was appropriately cured in the coagulation bath, the cylindrical filament passed through a godet roller and entered a hot water bath. The temperature of the hot water bath was controlled at 50°C and the draw ratio was 1:2 to stretch the fiber to a certain extent and wash the fiber at the same time. Subsequently, the fiber entered the next water wash to wash the solvent inside the fiber. Finally, a dryer was used for drying.

[0103] Example 31

[0104] 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 obtain an outer shaft spinning solution, which was used for perfusion into the outer shaft spinneret; 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. Carbon black with a mass fraction of 1% relative to chitin cellulose was added to 200 g of the chitin fiber solution and stirred evenly to obtain an inner shaft spinning precursor solution, which was used for perfusion into the inner shaft spinneret. Subsequently, the spinning solution was quantitatively supplied by a metering pump, filtered by a filter, and pressed into a coagulation bath through an outer shaft spinneret with a diameter of 50 μm and an inner shaft spinneret with a diameter of 30 μm for solidification 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 consistent with 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 wash away the impurities on the fiber. The washed 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.

[0105] Example 32

[0106] 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 obtain an outer-axis spinning solution, which was used for perfusion into the outer-axis spinneret; the inorganic flaky colored substances consisted of a metal flake as the substrate, with a layer of CoO and a layer of Co2O3 coated on its surface. The thickness of the metal flake 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. 1% graphene relative to the mass of the polyamide was added to 200 g of the polyamide solution and stirred evenly to obtain an inner-axis spinning precursor solution, which was used for perfusion into the inner-axis spinneret. Subsequently, the spinning solution was quantitatively supplied by a metering pump and filtered by a filter, and then pressed into a coagulation bath through an outer-axis spinneret with a diameter of 100 μm and an inner-axis spinneret with a diameter of 30 μm for coagulation and shaping: the coagulation bath was a 15% DMAC aqueous solution relative to the mass 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 roller, and preheated and stretched at a water bath temperature of 25°C. The polyamide 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 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.

[0107] Example 33

[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 30% relative to polyvinyl chloride were added to 200 g of the polyvinyl chloride solution and stirred evenly to obtain an outer shaft spinning solution, which was used for perfusion into the outer shaft spinneret; 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. 1% iron oxide black relative to the mass of polyvinyl chloride was added to 200 g of the polyvinyl chloride solution and stirred evenly to obtain an inner shaft spinning precursor solution, which was used for perfusion into the inner shaft spinneret. Subsequently, the spinning solution was quantitatively supplied by a metering pump, filtered by a filter, and pressed into a coagulation bath through an outer shaft spinneret with a diameter of 100 μm and an inner shaft spinneret with a diameter of 30 μm for solidification and forming: the coagulation bath was a 50% DMSO aqueous solution by mass fraction 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 chloride 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 polyvinyl chloride fiber tow after preheating bath treatment was introduced into a water washing tank 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 polyvinyl chloride 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 34

[0110] 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 the mass of poly(m-phenylene isophthalamide) were added to 200 g of the poly(m-phenylene isophthalamide) solution and stirred evenly to obtain an outer shaft spinning solution, which was used for perfusion into the outer shaft spinneret; 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. 1% carbon black relative to the mass of poly(m-phenylene isophthalamide) was added to 200 g of the poly(m-phenylene isophthalamide) solution and stirred evenly to obtain an inner shaft spinning precursor solution, which was used for perfusion into the inner shaft spinneret. Subsequently, the spinning solution was quantitatively supplied by a metering pump, filtered by a filter, and pressed into a coagulation bath through an outer shaft spinneret with a diameter of 60 μm and an inner shaft spinneret with a diameter of 30 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(m-phenylene isophthalamide) 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-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.

[0111] Example 35

[0112] Examples 2, 15, 20, and 30 were tested for light fastness on an Atlas XenoTest Alpha xenon arc weatherometer from SDL-Atalas, USA, according to the method of AATCC TM16-2003, and rated using a gray scale for color change evaluation in accordance with GB250-1995; there was no obvious damage after 200 friction cycles; after 30 normal temperature water washes, there was no obvious change on the fiber surface. The test results are shown in Table 1.

[0113] Table 1 Properties of synthetic fibers in some examples

[0114]

[0115] All of the above high-saturation color fibers have a mixture of a dark substance and a polymer fiber as the core, making the saturation of the fiber color higher; an inorganic flaky colored substance and a polymer fiber mixture are coated on the outside to form a core-shell structure, and the inorganic flaky colored substances coated on the outside are arranged in a manner parallel to the fiber axis, and this arrangement makes the fiber color brighter; by introducing the inorganic flaky colored substance, the fiber color has good weather resistance, heat resistance and light stability; and it is evenly embedded in the polymer to make the fiber have good abrasion resistance and washability.

[0116] 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 present invention scheme, or be transformed into equivalent embodiments of 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 present invention technology is within the scope of protection of the present invention technology scheme.

Claims

1. A colored fiber, characterized in that: The colored fiber is a core-shell structure fiber, with a mixture of dark substance and polymer fiber as the core, and an inorganic flaky colored substance and polymer fiber mixture coated on the outside to form a coating layer, and the inorganic flaky colored substance is arranged in parallel with the fiber axis.

2. The colored fiber according to claim 1, wherein: The polymer fibers include chemical fibers and natural fibers. Chemical fibers include regenerated fibers and synthetic fibers. Regenerated fibers include one or more of soybean fibers, cotton fibers, viscose fibers, modal fibers, and bamboo pulp fibers. Synthetic fibers include one or more of aromatic polyamide fibers, polyester fibers, polyamide fibers, polyacrylonitrile fibers, polyether fibers, polyurethane fibers, polyurethane fibers, polypropylene fibers, polyvinyl chloride fibers, polyvinyl alcohol fibers, polyvinyl acetal fibers, polyformaldehyde fibers, polyetheretherketone fibers, cuprammonium fibers, seaweed fibers, chitosan fibers, chitin fibers, cellulose acetate fibers, and phosphorus-modified phenolic fibers. Natural fibers include animal fibers and plant fibers. Animal fibers include one or more of wool and silk. Plant fibers include one or more of cotton, hemp, and avicell fibers. The dark substance includes a mixture or a composite of one or more of carbon black, Vanta black, graphene, carbon nanotubes, and black iron oxide; The inorganic flaky colored substance is based on a flaky material with a metal oxide layer coated on the surface thereof, and the metal oxide layer is 1 to 3 layers.

3. The colored fiber according to claim 2, characterized in that: 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 a mixture or composite 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, 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 fiber according to claim 1, wherein: The thickness of the dark substance is 3-300 nm, and the thickness of the coating layer of the mixture of the inorganic flaky colored substance layer and the polymer fiber is 2-200 μm.

6. The highly saturated color fiber according to claim 1, characterized in that: The diameter of the core fiber is 3-300 μm, and the thickness of the cladding layer is 2-200 μm.

7. The colored fiber according to claim 1, characterized in that: The inorganic flake colored substance is embedded in the polymer fiber in a manner of being arranged in parallel with the fiber center axis, and the content of the inorganic flake colored substance is 1%-30%.

8. The method for preparing the colored fiber according to any one of claims 1-7, characterized in that: The steps include: S1: dissolving the polymer in a solvent, mixing it with an inorganic flake colored substance at a specified temperature to obtain a mixed solution, and using it as an inner axis spinning precursor solution; S2: dissolving the polymer fiber in a solvent additive, mixing it with a dark substance at a specified temperature to obtain a mixed solution, and using it as an external axis spinning solution; S3: Infusing the inner-axis spinning solution into the inner-axis spinneret and the outer-axis spinning solution into the outer-axis spinneret for coaxial spinning to obtain highly saturated colored fibers.

9. The preparation method according to claim 8, characterized in that: In steps S1 and S2, the polymer includes one or more of aromatic polyamide, polyester, polyamide, polyacrylonitrile, polyether, polyurethane, polypropylene, polyvinyl chloride, polyvinyl alcohol, polyvinyl acetal, polyoxymethylene, polyether ether ketone, cuprammonium, seaweed, chitosan, chitin, cellulose acetate, phosphorus-modified phenolic resin, or a mixture or composite thereof; 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 composite thereof; The temperature is 10 - 65 °C.

10. The preparation method according to claim 8, characterized in that: In step S3, the diameter of the inner spinneret is 3 - 300 μm, and the diameter of the outer spinneret is 5 - 500 μm; Coaxial spinning includes coaxial solution spinning or coaxial electrospinning; The inner and outer spinning solutions are first filtered and then spun; The spinning process includes spinning, coagulation, stretching, washing, and drying steps; 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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