A colored flash-evaporated nonwoven fabric, its preparation method and application

Abstract

This application belongs to the field of fibers, specifically disclosing a colored flash-evaporated nonwoven fabric, its preparation method, and its application. This application improves the pigment dispersion effect by adding dyeing auxiliaries, and simultaneously improves the compatibility of the dyeing auxiliaries in the system by compounding with an ethylene-vinyl acetate copolymer that has better compatibility with the dyeing auxiliaries. Furthermore, it improves the dispersibility and wettability of the pigment and dyeing auxiliaries by using polyvinylpyrrolidone and fatty alcohol polyoxyethylene ether, thereby improving the coloring effect of the flash-evaporated nonwoven fabric while maintaining its good tensile properties.

Description

Technical Field

[0001] This application belongs to the field of fibers, specifically relating to a colored flash nonwoven fabric, its preparation method, and its application. Background Technology

[0002] Polyethylene (PE) possesses high stability, abrasion resistance, cut resistance, chemical corrosion resistance, as well as a smooth surface, lightweight softness, and water resistance, making it widely used in clothing, fisheries, and sporting goods. However, PE has limited color options, and its large molecular chains, high crystallinity, non-polarity, and hydrophobicity make it difficult to color. Conventional fiber dyeing methods are unsuitable or ineffective, resulting in uneven color and poor colorfastness in PE fiber materials. Furthermore, conventional pigments dispersed in PE fibers remain in particulate form, leading to poor compatibility and dispersibility, which degrades the tensile and other mechanical properties of the PE fiber matrix, making it impossible to achieve both good mechanical and coloring properties.

[0003] Flash spinning is a spinning method in which a polymer solution (such as a polyethylene solution) is extruded into an atmospheric pressure environment at a pressure above the solvent's boiling point. Due to the rapid decrease in pressure, the solvent evaporates rapidly, transforming into extremely fine fiber filaments. After filament separation, collection, finishing, and reinforcement, flash nonwoven fabric products are obtained. Compared to traditional nonwoven materials, flash nonwoven fabrics not only have finer fiber filaments and better mechanical properties, but also offer higher forming efficiency and shorter production cycles. To meet the needs of fiber coloring, coloring raw materials can be blended with polymer raw materials before spinning, resulting in colored flash nonwoven fabrics. This method can save on dye usage and improve dyeing efficiency. Summary of the Invention

[0004] To address the poor mechanical and coloring properties of polyethylene fibers in existing technologies, this application aims to provide a colored flash-dyed nonwoven fabric, its preparation method, and its applications. This application improves pigment dispersion by adding dyeing auxiliaries, and simultaneously enhances the compatibility of the dyeing auxiliaries within the system by compounding with an ethylene-vinyl acetate copolymer that has better compatibility with the dyeing auxiliaries. Furthermore, it improves the dispersibility and wettability of pigments and dyeing auxiliaries through polyvinylpyrrolidone and fatty alcohol polyoxyethylene ether, thereby improving the coloring effect and color fastness of the flash-dyed nonwoven fabric while maintaining its good tensile properties.

[0005] To achieve the above objectives, the following technical solutions are specifically included:

[0006] A colored flash nonwoven fabric comprises the following components in parts by weight: 100 parts high-density polyethylene (HDPE), 10-30 parts low-density polyethylene (LDPE), 3-8 parts ethylene-vinyl acetate copolymer (EVA), 0.5-5 parts dyeing auxiliaries, 1-4 parts polyvinylpyrrolidone (PVP), 0.5-6 parts pigment, 0.05-1.5 parts fatty alcohol polyoxyethylene ether, and 0.1-1 parts antioxidant. The dyeing auxiliaries include at least one of sodium sulfate, boron nitride, and wollastonite.

[0007] In the colored flash nonwoven fabric of this application, the dyeing auxiliaries may increase the viscosity of the melt system to a certain extent. During the melt blending process, they effectively transfer shear force and act as abrasives for easily agglomerated pigments, which is beneficial for pigment dispersion and helps prevent pigment agglomeration. Simultaneously, as inorganic materials, the dyeing auxiliaries can provide a certain filling effect, improving fiber strength and aging resistance. However, as inorganic materials, the dyeing auxiliaries have poor compatibility with the matrix resin, requiring the presence of an ethylene-vinyl acetate copolymer. The dyeing auxiliaries tend to be compatible with ethylene-vinyl acetate copolymers, which are also easily compatible with polyethylene. Furthermore, polyvinylpyrrolidone and fatty alcohol polyoxyethylene ethers are used as dispersants and surfactants to improve the dispersibility and wettability of the dyeing auxiliaries and pigments with the matrix resin while maintaining good tensile properties, thereby improving the fiber's coloring effect and color fastness, and comprehensively achieving good mechanical and coloring properties.

[0008] Preferably, the dyeing aid is boron nitride and wollastonite, and the mass ratio of boron nitride to wollastonite is (0.5-1.5):(0.5-1.5).

[0009] More preferably, the mass ratio of boron nitride to wollastonite is one or any two of the following: (0.3:1), (0.5:1), (1:1), (1.5:1), (2:1), (3:1).

[0010] Boron nitride has certain lubricating properties, while wollastonite has a fibrous morphology. The combination of the two may make it easier for pigments to be adsorbed on the surfaces of boron nitride and wollastonite, thereby further improving the dispersion of pigments and enhancing the uniformity and coloring effect of fiber coloring.

[0011] Preferably, the average particle size of the dyeing aid is greater than or equal to 0.1 μm and less than or equal to 5 μm.

[0012] More preferably, the average particle size of the dyeing agent is a range of one or any two of the following: 0.1 μm, 0.5 μm, 1 μm, 1.5 μm, 2 μm, 2.5 μm, 3 μm, 3.5 μm, 4 μm, 4.5 μm, and 5 μm.

[0013] More preferably, the average particle size of wollastonite is greater than or equal to 1 μm and less than or equal to 5 μm.

[0014] More preferably, the average particle size of boron nitride is greater than or equal to 0.1 μm and less than or equal to 1 μm.

[0015] More preferably, the average particle size of sodium sulfate is greater than or equal to 0.8 μm and less than or equal to 1 μm.

[0016] The average particle size of the dyeing aid affects its dispersion effect in the system. Within the above-mentioned average particle size, it can maintain a good shape. Not only will it not increase its surface energy and increase the probability of agglomeration due to excessively small particle size, but it can also better exert its own abrasive effect. When combined with pigment, the pigment is more easily adsorbed on its surface, improving the dispersion effect of the pigment, increasing the optical effects such as reflection and refraction of the fiber surface, and improving the coloring effect of the fiber.

[0017] Preferably, the K value of polyvinylpyrrolidone is greater than or equal to 17 and less than or equal to 90.

[0018] More preferably, the K value of polyvinylpyrrolidone is a range of one or both of 17, 20, 30, 40, 50, 60, 70, 80, and 90.

[0019] Different molecular weights of polyvinylpyrrolidone result in different viscosities, which affects its compatibility with other components, particularly the dispersion of dyeing auxiliaries and pigments. The molecular weight of polyvinylpyrrolidone can be expressed by the K value. The higher the K value, the higher the molecular weight. Below the aforementioned K value, polyvinylpyrrolidone is more effective in compatibility with other components, and is more beneficial for improving the color fastness and reducing the color difference of colored flash nonwoven fabrics.

[0020] Preferably, the HLB of the fatty alcohol polyoxyethylene ether is greater than or equal to 9 and less than or equal to 20.

[0021] More preferably, the HLB of the fatty alcohol polyoxyethylene ether is a range of one or any two of the following: 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20.

[0022] Preferably, the fatty alcohol polyoxyethylene ether includes at least one of polyoxyethylene octadecyl ether and polyoxyethylene lauryl ether.

[0023] The HLB of fatty alcohol polyoxyethylene ethers affects the wetting effect of fibers, and consequently affects the coloring effect of fibers. Within the above-mentioned HLB range, fibers exhibit better coloring effects, and compared with other types of surfactants, nonionic fatty alcohol polyoxyethylene ethers have better wetting effects on pigments.

[0024] Preferably, the high-density polyethylene has a melt index of greater than or equal to 5 g / 10 min and less than or equal to 15 g / 10 min at 190°C and 2.16 kg load, according to ASTM D1238.

[0025] More preferably, the high-density polyethylene has a melt index of 5 g / 10 min, 6 g / 10 min, 7 g / 10 min, 8 g / 10 min, 9 g / 10 min, 10 g / 10 min, 11 g / 10 min, 12 g / 10 min, 13 g / 10 min, 14 g / 10 min, or 15 g / 10 min, according to ASTM D1238 at 190°C and 2.16 kg load, or any two of these values.

[0026] Preferably, the low-density polyethylene has a melt index of greater than or equal to 20 g / 10 min and less than or equal to 30 g / 10 min at 190 °C and 2.16 kg load, according to ASTM D1238.

[0027] More preferably, the low-density polyethylene has a melt index of 20 g / 10 min, 21 g / 10 min, 22 g / 10 min, 23 g / 10 min, 24 g / 10 min, 25 g / 10 min, 26 g / 10 min, 27 g / 10 min, 28 g / 10 min, 29 g / 10 min, or 30 g / 10 min, according to ASTM D1238 at 190°C and 2.16 kg load, or any two of these values.

[0028] High-density polyethylene (HDPE) has superior toughness, but poor aging resistance. Low-density polyethylene (LDPE) has poor tensile properties, but superior aging resistance. Meanwhile, HDPE and LPE, as well as LPE and pigments, have good compatibility, which does not reduce the overall system compatibility and, to some extent, increases the fiber's aging resistance, providing a foundation for maintaining good color fastness.

[0029] Preferably, the pigment includes at least one of organic pigments and inorganic pigments.

[0030] More preferably, the organic pigment includes at least one of azo pigments, phthalocyanine pigments, and heterocyclic pigments.

[0031] Pigments, as coloring materials, provide color to fibers, and their dispersion and penetration effects significantly influence the fiber's coloring outcome. Compared to inorganic pigments, organic pigments exhibit better compatibility in polyethylene systems, facilitating their uniform dispersion within the fibers and resulting in richer and brighter colors. Different types of pigments can be used individually or in combination.

[0032] Preferably, the average particle size of the pigment is greater than or equal to 0.05 μm and less than or equal to 10 μm.

[0033] More preferably, the average particle size of the pigment is a range of one or any two of the following: 0.05 μm, 0.1 μm, 1 μm, 2 μm, 3 μm, 4 μm, 5 μm, 6 μm, 7 μm, 8 μm, 9 μm, and 10 μm.

[0034] The average particle size of pigments not only affects their dispersion effect in polyethylene systems, but also the average particle size of pigments is not necessarily better the smaller or the larger it is. It is related to the reflection and scattering effects of pigments in the system. Within the above-mentioned range of average pigment particle size, fibers can maintain a better coloring effect.

[0035] Preferably, the antioxidant includes at least one of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] (antioxidant 1010), tris[2,4-di-tert-butylphenyl] phosphite (antioxidant 168), and octadecyl β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate (antioxidant 1076).

[0036] Antioxidants not only inhibit the deterioration of fiber mechanical properties, but also, because the deterioration mechanism of pigments caused by ultraviolet rays, free radicals, etc. is similar to the deterioration mechanism of fiber mechanical properties, they can also inhibit the change of fiber color and improve the color fastness of fiber to a certain extent.

[0037] This application also provides an application of colored flash-evaporated nonwoven fabric in the preparation of cultural and creative printed materials, clothing, and daily necessities. The colored flash-evaporated nonwoven fabric of this application has high tensile strength, uniform color, good coloring effect, and high color fastness, making it more suitable for use in the preparation of cultural and creative printed materials, clothing, and daily necessities, effectively ensuring their usability. Furthermore, the colored flash-evaporated nonwoven fabric of this application can be used in the form of monofilament fibers, or in the form of fiber cloth or fiber film layer, and can be spun, woven, drawn, or pulled according to actual needs.

[0038] A method for preparing a colored flash nonwoven fabric includes the following steps:

[0039] (1) Low-density polyethylene, ethylene-vinyl acetate copolymer, dyeing agent, polyvinylpyrrolidone, pigment, fatty alcohol polyoxyethylene ether, and antioxidant are blended, extruded, and granulated to obtain masterbatch.

[0040] (2) High-density polyethylene, masterbatch, and solvent are mixed, then heated and nitrogen gas is introduced to make the temperature inside the mixing device greater than or equal to 200°C and less than or equal to 230°C, and the pressure greater than or equal to 10 MPa and less than or equal to 12 MPa, to obtain a spinning solution.

[0041] (3) The spinning solution is subjected to flash spinning, cold pressing and hot rolling to obtain colored flash nonwoven fabric.

[0042] Preferably, the solvent has a boiling point of less than or equal to 100°C.

[0043] More preferably, the solvent includes at least one of benzene, toluene, butane, pentene, n-hexane, heptane, octane, cyclohexane, dichloromethane, carbon tetrachloride, chloroform, chloromethane, chlorofluoromethane, and chloroethane.

[0044] More preferably, the mass ratio of the solid phase to the liquid phase in the spinning solution is (10:90) to (30:70).

[0045] Compared with the prior art, this application has the following beneficial effects: This application improves the dispersion effect of pigments by adding dyeing auxiliaries, and at the same time improves the compatibility of dyeing auxiliaries in the system by compounding with ethylene-vinyl acetate copolymer which has better compatibility with dyeing auxiliaries. It also improves the dispersibility and wettability of pigments and dyeing auxiliaries by polyvinylpyrrolidone and fatty alcohol polyoxyethylene ether, thereby improving the coloring effect of flash nonwoven fabric while maintaining the good tensile properties of flash nonwoven fabric. Detailed Implementation

[0046] To better illustrate the purpose, technical solution, and advantages of this application, the following description, in conjunction with specific embodiments and comparative examples, aims to provide a detailed understanding of the content of this application, rather than limiting it. All other embodiments obtained by those skilled in the art without inventive effort are within the protection scope of this application. Unless otherwise specified, the experimental reagents and instruments involved in the implementation of this application are all commonly used reagents and instruments.

[0047] The following description of some of the raw materials used in the examples and comparative examples:

[0048] HDPE: Melt index of 6g / 10min at 190℃ and 2.16kg load, Qilu Petrochemical MH602.

[0049] LDPE: Melt index of 25g / 10min at 190℃ and 2.16kg load, Sinopec LD400.

[0050] Polyoxyethylene (100) octadecyl ether: Sigma-Aldrich, HLB 18.8.

[0051] Polyoxyethylene (10) octadecyl ether: Sigma-Aldrich, HLB 12.

[0052] Polyoxyethylene lauryl ether: Sigma-Aldrich, HLB 9.

[0053] Sodium dodecylbenzenesulfonate: HLB 11.7, commercially available.

[0054] EVA: ExxonMobil LD728.PM.

[0055] PVP, K17, Hangzhou Hengquan Technology Development Co., Ltd.

[0056] PVP, K25, Hangzhou Hengquan Technology Development Co., Ltd.

[0057] PVP, K90, Hangzhou Hengquan Technology Development Co., Ltd.

[0058] Pigment: Monoazo lake pigment, Clariant Pigment Red 247, average particle size 180nm.

[0059] Wollastonite: Jiangxi Liyuan Powder Technology Co., Ltd., 2500M, average particle size approximately 2-5μm.

[0060] Boron nitride: Yumu (Ningbo) New Materials Co., Ltd., BN-500Y, average particle size 500nm.

[0061] Sodium sulfate: commercially available, ground to a particle size of 0.8-1μm.

[0062] The compound antioxidant is obtained by combining antioxidant 1010 and antioxidant 168 in a 1:1 ratio. Both antioxidant 1010 and antioxidant 168 are commercially available.

[0063] Example 1

[0064] A colored flash-evaporated nonwoven fabric, the composition of which is shown in Table 1, and the specific preparation method includes the following steps:

[0065] (1) Mix low-density polyethylene, ethylene-vinyl acetate copolymer, dyeing agent, polyvinylpyrrolidone, pigment, fatty alcohol polyoxyethylene ether, and antioxidant, then transfer the mixture to a twin-screw extruder and melt-extrude it at 90–180°C to obtain masterbatch. The temperature settings of the twin-screw extruder are: Zone 1 90–110°C, Zone 2 120–130°C, Zone 3 150–160°C, Zone 4 170–180°C, Zone 5 170–185°C, Zone 6 170–185°C, Zone 7 160–165°C, Zone 8 160–165°C, Zone 9 160–165°C, Zone 10 160–165°C. The screw speed of the twin-screw extruder is 180–220 rpm.

[0066] (3) High-density polyethylene and masterbatch are mixed and then transferred to a reaction vessel containing a mixed solvent of difluorochloromethane and tetrafluorodichloroethane (volume ratio of difluorochloromethane to tetrafluorodichloroethane is 15:85). The mixture is preheated to 180°C, then pressurized to 12 MPa by introducing nitrogen gas, and finally heated to 225°C and stirred in a sealed container for 2 hours. After the temperature stabilizes, a spinning solution is obtained. The mass ratio of solid phase to liquid phase in the spinning solution is 15:85.

[0067] (4) Refer to CN115323628B and use flash spinning equipment 300 or other conventional spinning equipment. Transfer the spinning solution to the nozzle for spinning, and then form a mesh by refraction and reflection by the rotating filament splitter and lay it on the moving screen. The speed of the sprayed air is 12000m / min, the frequency of the rotating filament splitter is 35Hz, and the forward speed of the moving screen is 45m / min. After the collected mesh is cold-pressed at 0.5-1MPa and hot-rolled at 140℃ and 3-3.5MPa (hot rolling roller speed is 45-50m / min), a colored flash nonwoven fabric with a thickness of about 0.12mm is obtained.

[0068] Examples 2-12

[0069] Examples 2-12 are colored flash-evaporated nonwoven fabrics that differ from Example 1 in the composition of the raw materials. The specific components are shown in Table 1, and the specific preparation method is the same as that in Example 1.

[0070] Comparative Examples 1-6

[0071] The colored flash nonwoven fabrics of Comparative Examples 1 to 6 differ from those of Example 1 in the composition of the raw materials. The specific components are shown in Table 2, and the specific preparation method is the same as that of Example 1.

[0072] Table 1

[0073]

[0074] Table 2

[0075]

[0076]

[0077] It should be noted that HLB-9, HLB-12, and HLB-18 mentioned in Tables 1 and 2 represent polyoxyethylene lauryl ether, polyoxyethylene (10) octadecyl ether, and polyoxyethylene (100) octadecyl ether, respectively. The raw material components in Tables 1 and 2 are expressed in parts by weight.

[0078] To verify the performance of the colored flash nonwoven fabric of this application, the products obtained from the above embodiments and comparative examples were subjected to the following performance tests. The specific methods and qualification standards are as follows:

[0079] (1) Tensile properties: Tested according to GB / T 328.9. The qualified standard is: MD (longitudinal) greater than or equal to 180N / 50mm, CD (transverse) greater than or equal to 140N / 50mm, and the elongation of MD (longitudinal) and CD (transverse) greater than or equal to 10%.

[0080] (2) Color fastness to rubbing: The test shall be conducted in accordance with GB / T 3920. The color fastness grades are divided into 1, (1~2), 2, (2~3), 3, (3~4), 4, (4~5) and 5. The color fastness grade higher than (3~4) is qualified.

[0081] (3) Color difference: The test shall be conducted in accordance with GB / T 8424.1. The color difference value (expressed as ΔE) shall be less than or equal to 1 and pass the test.

[0082] The performance results are shown in Table 3 below.

[0083] Jia 3

[0084]

[0085]

[0086] As shown in Table 3 above, the colored flash nonwoven fabric prepared in the above embodiments exhibits tensile properties with a MD (longitudinal) greater than or equal to 300 N / 50 mm, a CD (transverse) greater than or equal to 230 N / 50 mm, and an elongation greater than or equal to 12%. The colored flash nonwoven fabric prepared in the above embodiments also exhibits color fastness higher than grade (3-4) and a color difference less than 0.8. The colored flash nonwoven fabric of this application maintains superior tensile properties while exhibiting uniform coloring and high color fastness. In the colored flash nonwoven fabric of this application, the dyeing agent may increase the viscosity of the melt system to a certain extent, effectively transferring shear force during melt blending. It acts as an abrasive for easily agglomerated pigments in the system, facilitating pigment dispersion and preventing pigment agglomeration. Simultaneously, the dyeing agent, being an inorganic material, can provide a certain filling effect, improving fiber strength and aging resistance. However, dyeing auxiliaries are inorganic materials, and their compatibility with the matrix resin is poor. It is necessary to have ethylene-vinyl acetate copolymer and dyeing auxiliaries working together. Dyeing auxiliaries tend to be more compatible with ethylene-vinyl acetate copolymer. At the same time, polyvinylpyrrolidone and fatty alcohol polyoxyethylene ether are used as dispersants and surfactants to improve the wettability and dispersion of dyeing auxiliaries and pigments with the matrix resin while maintaining good tensile properties. This improves the uniformity of fiber coloring and color fastness, thus achieving good mechanical and coloring properties in a comprehensive way.

[0087] Examples 1-4 show that sodium sulfate, boron nitride, and wollastonite all provide good dyeing aids, but boron nitride and wollastonite are particularly effective for dyeing colored flash-evaporated nonwoven fabrics. Furthermore, Examples 1 and 5-6 demonstrate that, with a fixed total amount of boron nitride and wollastonite, adding more boron nitride than wollastonite results in a greater improvement in tensile properties.

[0088] As can be seen from Examples 1 and 7-8, the HLB of fatty alcohol polyoxyethylene ether has a certain influence on the color fastness and color difference of the fiber. The HLB of fatty alcohol polyoxyethylene ether can be greater than or equal to 9-20, preferably greater than or equal to 12 and less than or equal to 18. Within the above range of HLB of fatty alcohol polyoxyethylene ether, the color fastness of colored flash nonwoven fabric is higher and the color difference is smaller.

[0089] As can be seen from Examples 1 and 9-10, the molecular weight of PVP affects its compounding effect with other components, resulting in a certain impact on the color fastness and color difference of the fiber. When the molecular weight of PVP is expressed as K value, the K value of PVP is greater than or equal to 17 and less than or equal to 90, and more preferably greater than or equal to 20 and less than or equal to 30, the fiber has higher color fastness and smaller color difference.

[0090] Compared to Examples 1-12, Comparative Example 1 lacked EVA, resulting in uneven dispersion of the dyeing auxiliaries, leading to poor system compatibility, reduced overall fiber performance, and ineffective pigment dispersion, resulting in significantly increased color difference. Comparative Example 2 lacked dyeing auxiliaries, failing to function as fillers to enhance fiber strength, and the pigment agglomeration in the system significantly increased fiber color difference. Comparative Example 3 used excessive amounts of dyeing auxiliaries; as inorganic materials, excessive addition prevented better compatibility with the resin system, significantly reducing fiber elongation and causing increased color difference due to uneven dispersion. Comparative Example 4 lacked PVP, resulting in relatively poor dispersion of dyeing auxiliaries and pigments in the fibers, and poor pigment coloring performance, leading to a significant decrease in fiber color fastness and a certain degree of reduction in color uniformity. Comparative Example 5 lacked fatty alcohol polyoxyethylene ether, reducing the dispersion of dyeing auxiliaries and pigments in the fibers, resulting in poor wetting effect of pigments on the resin, causing a sharp decrease in fiber color fastness and a certain degree of reduction in color uniformity. Comparative Example 6 uses an equal amount of sodium dodecylbenzenesulfonate to replace fatty alcohol polyoxyethylene ether. Compared with other types of surfactants, fatty alcohol polyoxyethylene ether has better dispersion and wetting effects on pigments, resulting in higher color fastness and smaller color difference in colored flash nonwoven fabrics.

[0091] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit the scope of protection of this application. Although this application has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this application without departing from the substance and scope of the technical solutions of this application.

Claims

1. A method for preparing a colored flash-evaporated nonwoven fabric, characterized in that, The colored flash nonwoven fabric comprises the following components in parts by weight: 100 parts high-density polyethylene, 10-30 parts low-density polyethylene, 3-8 parts ethylene-vinyl acetate copolymer, 0.5-5 parts dyeing agent, 1-4 parts polyvinylpyrrolidone, 0.5-6 parts pigment, 0.05-1.5 parts fatty alcohol polyoxyethylene ether, and 0.1-1 parts antioxidant. The dyeing agent includes at least one of sodium sulfate, boron nitride, and wollastonite. The method for preparing the colored flash nonwoven fabric includes the following steps: (1) Low-density polyethylene, ethylene-vinyl acetate copolymer, dyeing agent, polyvinylpyrrolidone, pigment, fatty alcohol polyoxyethylene ether, and antioxidant are blended, extruded, and granulated to obtain masterbatch; (2) Mix high-density polyethylene, the masterbatch and the solvent, then heat and introduce nitrogen gas so that the temperature in the mixing device is greater than or equal to 200°C and less than or equal to 230°C, and the pressure is greater than or equal to 10MPa and less than or equal to 12MPa to obtain a spinning solution. (3) The spinning solution is subjected to flash spinning, cold pressing and hot rolling to obtain the colored flash nonwoven fabric.

2. The method for preparing colored flash-evaporated nonwoven fabric as described in claim 1, characterized in that, The dyeing aid is boron nitride and wollastonite, and the mass ratio of boron nitride to wollastonite is (0.5~1.5):(0.5~1.5).

3. The method for preparing colored flash-evaporated nonwoven fabric as described in claim 1, characterized in that, The HLB of the fatty alcohol polyoxyethylene ether is greater than or equal to 9 and less than or equal to 20.

4. The method for preparing colored flash-evaporated nonwoven fabric as described in claim 1, characterized in that, The fatty alcohol polyoxyethylene ether includes at least one of polyoxyethylene octadecyl ether and polyoxyethylene lauryl ether.

5. The method for preparing colored flash-evaporated nonwoven fabric as described in claim 1, characterized in that, The high-density polyethylene, according to ASTM D1238, has a melt index greater than or equal to 5 g / 10 min and less than or equal to 15 g / 10 min at 190°C and 2.16 kg load.

6. The method for preparing colored flash-evaporated nonwoven fabric as described in claim 1, characterized in that, The low-density polyethylene, according to ASTM D1238, has a melt index greater than or equal to 20 g / 10 min and less than or equal to 30 g / 10 min at 190 °C and 2.16 kg load.

7. The method for preparing colored flash-evaporated nonwoven fabric as described in claim 1, characterized in that, The pigments include at least one of organic pigments and inorganic pigments.

8. The method for preparing colored flash-evaporated nonwoven fabric as described in claim 1, characterized in that, The K value of the polyvinylpyrrolidone is greater than or equal to and less than or equal to 90.

9. A colored flash nonwoven fabric prepared by the method of any one of claims 1-8.

10. The application of the colored flash nonwoven fabric as described in claim 9 in the preparation of cultural and creative printed materials, clothing, and daily necessities.

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