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

Abstract

This application discloses a colored flash-evaporated nonwoven fabric, its preparation method, and its application, belonging to the field of polymer materials technology. The colored flash-evaporated nonwoven fabric of this application comprises colored flash-evaporated fibers, which include the following components in parts by weight: 90-100 parts of ultra-high molecular weight polyethylene, 2-5 parts of linear low-density polyethylene, 0.5-2 parts of colorant, and 0.01-0.1 parts of hydroxyl-terminated polybutadiene. The addition of colorant and hydroxyl-terminated polybutadiene to this product improves color uniformity and color fastness while ensuring the product's mechanical and waterproof properties, resulting in a long service life when applied to cultural and creative printed materials, clothing, or household products.

Description

Technical Field

[0001] This application relates to the field of polymer materials technology, specifically to a colored flash nonwoven fabric and its preparation method and application. Background Technology

[0002] Flash nonwoven fabric is a nonwoven product formed by extruding a polymer (usually polyethylene) solution at a pressure above the boiling point of the solvent into an atmospheric pressure environment. Due to the rapid change in pressure, it is transformed into fiber filaments and then aggregated. Compared with traditional nonwoven materials, it not only has high forming efficiency and uniform microstructure, but also has ideal mechanical strength and protective effect. At the same time, it is lightweight and very suitable for the field of medical protective packaging.

[0003] During the production process, undyed raw materials are directly processed through spinning, web formation, and reinforcement, so their original color is usually white or close to the color of the fiber itself. To meet the color requirements of different fields, flash nonwoven fabrics often use post-spinning coloring processes to add or change colors. However, due to the special fiber structure and surface properties of flash nonwoven fabrics, during the post-spinning coloring process, the ink may have difficulty penetrating evenly and adhering firmly to the fiber surface, resulting in uneven coloring or easy peeling. In addition, the ink used for post-spinning coloring may affect the air permeability of flash nonwoven fabrics, and the ink may gradually fade or wear due to friction, washing, and other factors, affecting the product's appearance and service life. Organic pigments have the advantages of bright and obvious colors, complete color spectrum and high coloring power. They can improve the color fastness of nonwoven fabrics by coloring before spinning. However, organic pigments have low temperature resistance, most of which are below 200℃. In the flash spinning process, the spinning solution needs to be treated in a high temperature and high pressure environment for a long time. Organic pigments are easily degraded during the flash spinning process due to multiple effects of temperature, pressure and spinning solvent, resulting in poor color uniformity and color fastness of the prepared fiber products. Summary of the Invention

[0004] Based on the deficiencies of existing technologies, the purpose of this application is to provide a colored flash nonwoven fabric and its preparation method and application. By adding colorants and hydroxyl-terminated polybutadiene to the product, the color uniformity and color fastness of the product are improved while ensuring the mechanical properties and waterproof properties of the product. The product has a long service life when applied to cultural and creative printed materials, clothing or household products.

[0005] To achieve the above objectives, the technical solution adopted in this application is as follows:

[0006] A colored flash nonwoven fabric includes colored flash fibers, which comprise the following components in parts by weight: 90-100 parts of ultra-high molecular weight polyethylene, 2-5 parts of linear low-density polyethylene, 0.5-2 parts of colorant, and 0.01-0.1 parts of hydroxyl-terminated polybutadiene.

[0007] In some embodiments, the viscosity of hydroxyl-terminated polybutadiene at 30°C is greater than or equal to 5 Pa·s and less than or equal to 50 Pa·s.

[0008] In some implementations, the colorant is an organic pigment.

[0009] In some embodiments, the linear 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.

[0010] In some embodiments, the colored flash fiber composition also includes high-density polyethylene, wherein the weight percentage of high-density polyethylene in the colored flash fiber composition is 0.4-1.2 parts.

[0011] In some embodiments, the high-density polyethylene has a melt index of greater than or equal to 0.1 g / 10 min and less than or equal to 1 g / 10 min at 190 °C and 2.16 kg load, according to ASTM D1238.

[0012] Secondly, this application provides a method for preparing colored flash-evaporated nonwoven fabric, comprising the following steps:

[0013] The colorant, hydroxyl-terminated polybutadiene, and the first solvent are mixed evenly to obtain a colored paste.

[0014] The remaining components and colored slurry in the colored flash nonwoven fabric are added to a mixing device containing a second solvent. The device is then heated and nitrogen gas is introduced to make the temperature in 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.

[0015] The spinning solution is placed in a flash spinning device for spinning and the fiber is received by a receiving device to form a film. The resulting fiber film is then cold-pressed and hot-rolled to obtain colored flash nonwoven fabric.

[0016] In some embodiments, the total mass of colorant and hydroxyl-terminated polybutadiene is 5-15% based on 100% of the total mass of the colored paste.

[0017] On the other hand, it provides applications for colored flash nonwoven fabrics in the preparation of cultural and creative printed materials, clothing, or household products.

[0018] In some embodiments, colored flash nonwoven fabrics are incorporated into cultural and creative printed materials, apparel, or household products by at least one of the following methods: interlocking, bonding, and heat sealing.

[0019] The beneficial effects of this application are that it provides a colored flash nonwoven fabric and its preparation method. By adding colorant and hydroxyl-terminated polybutadiene to the product, the color uniformity and color fastness of the product are improved while ensuring the mechanical properties and waterproof properties of the product. The product also has a long service life when used in the field of protection. Detailed Implementation

[0020] To facilitate understanding of this disclosure, a more complete description will be provided below. However, this disclosure may be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure.

[0021] As used in this article:

[0022] "Prepared from" is synonymous with "comprising". The terms "comprising", "including", "having", "containing", or any other variations thereof as used herein are intended to cover non-exclusive inclusion. For example, a composition, step, method, article, or apparatus that includes the listed elements is not necessarily limited to those elements, but may include other elements not expressly listed or elements inherent to such composition, step, method, article, or apparatus.

[0023] The conjunction "composed of..." excludes any unspecified elements, steps, or components. If used in a claim, this phrase makes the claim closed, excluding materials other than those described, except for associated conventional impurities. When the phrase "composed of..." appears in a clause of the body of a claim rather than immediately following it, it limits only the elements described in that clause; other elements are not excluded from the claim as a whole.

[0024] When a quantity, concentration, or other value or parameter is expressed as a range, a preferred range, or a range defined by a series of upper and lower preferred values, this should be understood as specifically disclosing all ranges formed by any pair of any upper or preferred value with any lower or preferred value, regardless of whether the range is disclosed individually. For example, when the range “1-5” is disclosed, the described range should be interpreted as including ranges “1-4”, “1-3”, “1-2”, “1-2 and 4-5”, “1-3 and 5”, etc. When numerical ranges are described herein, unless otherwise stated, the range is intended to include its endpoints and all integers and fractions within that range.

[0025] In these embodiments, unless otherwise specified, the portions and percentages are all by weight.

[0026] "Parts by mass" refers to the basic unit of measurement that expresses the mass ratio of multiple components. One part can represent any unit mass, such as 1g or 2.689g. If we say that component A has "a" parts by mass and component B has "b" parts by mass, it means the ratio of the mass of component A to the mass of component B is a:b. Alternatively, it can mean that the mass of component A is aK and the mass of component B is bK (K is any number representing a multiplier). It is important to understand that, unlike the number of parts by mass, the sum of the mass parts of all components is not limited to 100 parts.

[0027] "And / or" is used to indicate that one or both of the described situations may occur, for example, A and / or B includes (A and B) and (A or B).

[0028] A colored flash nonwoven fabric includes colored flash fibers, which comprise the following components in parts by weight: 90-100 parts of ultra-high molecular weight polyethylene, 2-5 parts of linear low-density polyethylene, 0.5-2 parts of colorant, and 0.01-0.1 parts of hydroxyl-terminated polybutadiene.

[0029] In different embodiments, the weight parts of ultra-high molecular weight polyethylene can be, but are not limited to, 90 parts, 91 parts, 92 parts, 93 parts, 94 parts, 95 parts, 96 parts, 97 parts, 98 parts, 99 parts, or 100 parts.

[0030] In different embodiments, the weight parts of linear low-density polyethylene can be, but are not limited to, 2 parts, 2.5 parts, 3 parts, 3.5 parts, 4 parts, or 5 parts.

[0031] In different embodiments, the weight parts of the colorant can be, but are not limited to, 0.5 parts, 0.8 parts, 1 part, 1.2 parts, 1.5 parts, 1.7 parts, or 2 parts.

[0032] In different embodiments, the weight parts of hydroxyl-terminated polybutadiene may be, but are not limited to, 0.01 parts, 0.03 parts, 0.05 parts, 0.08 parts, or 0.1 parts.

[0033] In this application, to improve the processing and coloring properties of ultra-high molecular weight polyethylene (UHMWPE), linear low-density polyethylene (LDPE) is added to the component system of colored flash nonwoven fibers. However, it is difficult for LLDPE and UHMWPE to form a uniform morphology, which can lead to a decrease in the mechanical and coloring properties of the product. Therefore, in the above-mentioned matrix resin system, hydroxyl-terminated polybutadiene (TPP) is added. On the one hand, TPP can improve the compatibility of LLDPE and UHMWPE and enhance the mechanical properties of the product. On the other hand, TPP acts as a dispersant for the colorant, anchoring the colorant at multiple points. One end of the anchoring group is entangled and adsorbed with the matrix resin, while the other end is coated with the colorant particles, thus dispersing the colorant. Furthermore, the solvation chain of TPP acts as a lubricant, improving the dispersion effect of the colorant, reducing stress concentration caused by pigment agglomerates, and improving the mechanical properties, color uniformity, and color fastness of the product.

[0034] In some embodiments, the viscosity of hydroxyl-terminated polybutadiene at 30°C is greater than or equal to 5 Pa·s and less than or equal to 50 Pa·s.

[0035] In different embodiments, the viscosity of hydroxyl-terminated polybutadiene at 30°C can be, but is limited to, 5 Pa·s, 8 Pa·s, 10 Pa·s, 15 Pa·s, 20 Pa·s, 25 Pa·s, 30 Pa·s, 35 Pa·s, 40 Pa·s, 45 Pa·s, and 50 Pa·s.

[0036] In this application, if the viscosity of the hydroxyl-terminated polybutadiene is too low, its anchoring effect is weak, and the dispersibility of the colorant is poor. Within the aforementioned range, as the viscosity increases, the dispersibility of the colorant improves, which is beneficial for improving the mechanical properties, color uniformity, and color fastness of the product. However, if the viscosity of the hydroxyl-terminated polybutadiene is too high, the viscosity of the polymer matrix will increase significantly, the colorant will easily agglomerate, causing stress concentration and affecting the mechanical properties, color uniformity, and color fastness of the product.

[0037] In some implementations, the colorant is an organic pigment.

[0038] Specifically, organic pigments include red organic pigments, green organic pigments, yellow organic pigments, and fluorescent organic pigments.

[0039] Preferably, the red organic pigment is at least one of Pigment Red 254 and Pigment Red 185.

[0040] Preferably, the green organic pigment is at least one of phthalocyanine green G, phthalocyanine green GW, and phthalocyanine green GH.

[0041] Preferably, it is at least one of the following yellow organic pigments: H2R Yellow, H4G Yellow, HG Yellow, HGR Yellow, HR02 Yellow, HR Yellow, H3R Yellow, H10G Yellow, GR Yellow, H2R Yellow, G180 Yellow, G151 Yellow, Permanent Yellow 2G, Permanent Yellow GR, Lightfast Yellow G, Pigment Yellow 151, Lightfast Yellow 10G, Permanent Yellow 5GX, 138 Yellow, 168 Yellow, Permanent Yellow HR, Permanent Yellow 2GS, Benzidine Yellow G, Permanent Yellow SD-BRL, Permanent Yellow G, Permanent Yellow SDGTL, Permanent Yellow SD-TRP, Permanent Yellow HRZ, Permanent Yellow HR-03, Permanent Yellow SD-FGL, Permanent Yellow SD-GRP, Neobenzidine Yellow SD-GRX, Permanent Yellow SD-3RP, and Permanent Yellow SD-2RP.

[0042] Preferably, the fluorescent organic pigment is 10g yellow and / or 8g yellow.

[0043] In some embodiments, the linear 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.

[0044] In different implementations, the melt index of linear low-density polyethylene at 190°C and 2.16 kg load, according to ASTM D1238, can be, but is not limited to, 20 g / 10 min, 22 g / 10 min, 25 g / 10 min, 28 g / 10 min, or 30 g / 10 min.

[0045] In some embodiments, the colored flash fiber composition also includes high-density polyethylene, wherein the weight percentage of high-density polyethylene in the colored flash fiber composition is 0.4-1.2 parts.

[0046] In different embodiments, the weight parts of high-density polyethylene in the colored flash fiber component may be, but are not limited to, 0.4 parts, 0.6 parts, 0.8 parts, 1 part, or 1.2 parts.

[0047] In the technical solution of this application, hydroxyl-terminated polybutadiene can improve the compatibility of high-density polyethylene with other components, and the addition of high-density polyethylene can improve the processing performance, mechanical properties and waterproof performance of the product.

[0048] Although high-density polyethylene can improve the processing performance of products to some extent, this component still has certain incompatibilities with ultra-high molecular weight polyethylene and linear low-density polyethylene. Therefore, if too much is added, it may reduce the performance improvement effect of the product or even cause a certain degree of decline.

[0049] In some embodiments, the melt index of high-density polyethylene at 190°C and 2.16 kg load, according to ASTM D1238, is greater than or equal to 0.1 g / 10 min and less than or equal to 1 g / 10 min; for example, it can be, but is not limited to, 0.1 g / 10 min, 0.3 g / 10 min, 0.5 g / 10 min, 0.8 g / 10 min, or 1 g / 10 min.

[0050] Secondly, this application provides a method for preparing colored flash-evaporated nonwoven fabric, comprising the following steps:

[0051] The colorant, hydroxyl-terminated polybutadiene, and the first solvent are mixed evenly to obtain a colored paste.

[0052] The remaining components and colored slurry in the colored flash nonwoven fabric are added to a mixing device containing a second solvent. The device is then heated and nitrogen gas is introduced to make the temperature in 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.

[0053] The spinning solution is placed in a flash spinning device for spinning and the fiber is received by a receiving device to form a film. The resulting fiber film is then cold-pressed and hot-rolled to obtain colored flash nonwoven fabric.

[0054] Preferably, the boiling points of the first solvent and the second solvent are each ≤400°C independently.

[0055] More preferably, the first solvent and the second solvent are each independently selected from at least one of white oil, decahydronaphthalene, paraffin wax, kerosene, olefin mineral oil, benzene, toluene, butane, pentene, n-hexane, heptane, octane, cyclohexane, dichloromethane, carbon tetrachloride, chloroform, chloromethane, chlorofluoromethane, and chloroethane.

[0056] In this application, the first solvent and the second solvent can be the same or different. In order to further improve the mixing uniformity of each component, this application prefers the same first solvent and second solvent.

[0057] More preferably, the mass ratio of the solid phase to the liquid phase in the spinning solution is (10:90)-(30:70).

[0058] More preferably, the flash spinning device is prepared using the production equipment 300 used in the inventor's prior research and development technology CN115323628B.

[0059] It should be noted that the products of this application are not limited to the production equipment mentioned above. Those skilled in the art can also use other types of flash evaporation production equipment to produce the products according to actual needs, as long as products with the same technical features and effects can be prepared.

[0060] In some embodiments, the total mass of colorant and hydroxyl-terminated polybutadiene is 5-15% based on 100% of the total mass of the colored paste.

[0061] In different embodiments, the total mass of colorant and hydroxyl-terminated polybutadiene can be, but is not limited to, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, or 15%, based on 100% of the total mass of the colored paste.

[0062] In the preparation of colored flash nonwoven fabric, colorants and hydroxyl-terminated polybutadiene are prepared into a colored slurry, which is then mixed with other components to prepare a spinning solution. The anchoring effect between the hydroxyl-terminated polybutadiene and the colorant improves the dispersibility of the colorant, thereby enhancing the color uniformity and color fastness of the product. However, in the colored slurry, the mass percentage of colorant and hydroxyl-terminated polybutadiene affects the dispersibility of the colorant, leading to a decrease in the color uniformity and color fastness of the product.

[0063] On the other hand, it provides applications for colored flash nonwoven fabrics in the preparation of cultural and creative printed materials, clothing, or household products.

[0064] Preferably, the colored flash nonwoven fabric of this application is included in cultural and creative printed materials, clothing or household products, and the colored flash nonwoven fabric is incorporated into the medical device protective product by at least one of the following methods, including but not limited to interlocking, bonding or heat sealing.

[0065] Preferably, the cultural and creative printed materials include, but are not limited to, at least one of canvas bags, stickers, refrigerator magnets, and tear-off books.

[0066] Preferably, the household products include, but are not limited to, at least one of the following: luggage bags, storage bags, seat covers, carpets, mattresses, curtains, and umbrellas.

[0067] The colored flash nonwoven fabric of this application has high mechanical properties, waterproof properties, color uniformity and color fastness, and can be widely used in cultural and creative printed materials, clothing or household products. While ensuring the mechanical properties and waterproof properties of the product, it also has high rubbing fastness and hypochlorite fastness, and can remain unchanged after multiple washes, thus extending the service life of the product.

[0068] The raw materials used in the embodiments and comparative examples are described below, but are not limited to these materials:

[0069] The ultra-high molecular weight polyethylene (UHWPE) is GUR-1050E manufactured by Tycona in the United States.

[0070] Linear low-density polyethylene (LLDPE) is a product of Sinopec's 7144 production line, with a melt index of 22 g / 10 min at 190℃ and 2.16 kg load.

[0071] The high-density polyethylene (HDPE) is product 5502 produced by Maoming Petrochemical. Its melt index is 0.35 g / 10 min at 190℃ and 2.16 kg load.

[0072] Hydroxyl-terminated polybutadiene 1 (HTPB-1) is CS-15 manufactured by ARC, with a viscosity of 26 Pa·s at 30°C.

[0073] Hydroxyl-terminated polybutadiene 2 (HTPB-2) is CS-15 manufactured by Sinclair, Inc. in the United States, with a viscosity of 20 Pa·s at 30°C.

[0074] Hydroxyl-terminated polybutadiene 3 (HTPB-3) is Lithene N4-5000 produced by Shanghai Xintema Chemicals Co., Ltd., with a viscosity of 11 Pa·s at 30°C.

[0075] Hydroxyl-terminated polybutadiene 4 (HTPB-4) is R-45HT manufactured by Idemitsu Corporation of Japan, with a viscosity of 5 Pa·s at 30°C.

[0076] Hydroxyl-terminated polybutadiene 5 (HTPB-5) is CN-15 manufactured by ARC, with a viscosity of 50 Pa·s at 30°C.

[0077] Example 1

[0078] This application discloses an embodiment of a colored flash nonwoven fabric and its preparation method. The composition of the colored flash fibers in the colored flash nonwoven fabric is shown in Table 1.

[0079] A method for preparing colored flash-evaporated nonwoven fabric includes the following steps:

[0080] (1) Preparation of colored paste: The colorant, hydroxyl-terminated polybutadiene and the first solvent are mixed evenly to obtain the colored paste, wherein the total mass of the colorant and hydroxyl-terminated polybutadiene is 10% of the mass of the colored paste.

[0081] (2) Preparation of spinning solution: Ultra-high molecular weight polyethylene, linear low-density polyethylene, high-density polyethylene and colored slurry are mixed and then transferred to a reaction vessel containing a second solvent. The mixture is preheated to 180°C and then pressurized to 12 MPa by introducing nitrogen gas. a Finally, the temperature was raised to 225℃ and stirred in a sealed container for 2 hours. After the temperature stabilized, a spinning solution was obtained, in which the mass ratio of solid phase to liquid phase was 15:85.

[0082] (3) Preparation of colored flash nonwoven fabric: Referring to CN1 / 5323628B, a flash spinning equipment 300 was used to transfer the spinning solution to the nozzle for spinning. The filaments were then refracted and reflected by a rotating splitting plate to form a mesh and laid on a moving screen. The speed of the ejected airflow was 12000 m / min, the frequency of the rotating splitting plate was 35 Hz, and the forward speed of the moving screen was 45 m / min. The collected mesh was cold-pressed at 0.5-1 MPa and hot-rolled at 140℃ and 3-3.5 MPa (hot rolling roller speed was 45-50 m / min) to obtain a colored flash nonwoven fabric with a thickness of about 0.12 mm.

[0083] The first solvent and the second solvent are both mixed solvents of white oil and tetrafluorodichloroethane, with a volume ratio of white oil to tetrafluorodichloroethane of 15:85.

[0084] Examples 4-10

[0085] A colored flash-evaporated nonwoven fabric and its preparation method are different from those in Example 1 only in the composition of the product, as shown in Table 1.

[0086] Example 11

[0087] A colored flash nonwoven fabric and its preparation method are different from those in Example 1 only in that step (1) of the preparation method of the product is different. In this example, step (1) of the preparation method of the flash nonwoven fabric is: the colorant, hydroxyl-terminated polybutadiene and the first solvent are mixed evenly to obtain a colored slurry, wherein the total mass of the colorant and hydroxyl-terminated polybutadiene is 5% of the mass of the colored slurry.

[0088] Example 12

[0089] A colored flash nonwoven fabric and its preparation method are different from those in Example 1 only in that step (1) of the preparation method of the product is different. In this example, step (1) of the preparation method of the flash nonwoven fabric is: the colorant, hydroxyl-terminated polybutadiene and the first solvent are mixed evenly to obtain a colored slurry, wherein the total mass of the colorant and hydroxyl-terminated polybutadiene is 15% of the mass of the colored slurry.

[0090] Comparative Examples 1-5

[0091] The only difference between each comparative example and the embodiment is the type and ratio of components, as shown in Table 2.

[0092] Comparative Example 6

[0093] A colored flash nonwoven fabric and its preparation method are different from those in Example 1 only in that step (1) of the preparation method of the product is different. In this comparative example, step (1) of the preparation method of the flash nonwoven fabric is: the colorant, hydroxyl-terminated polybutadiene and the first solvent are mixed evenly to obtain a colored slurry, wherein the total mass of the colorant and hydroxyl-terminated polybutadiene is 3% of the mass of the colored slurry.

[0094] Comparative Example 7

[0095] A colored flash nonwoven fabric and its preparation method are different from those in Example 1 only in that step (1) of the preparation method of the product is different. In this comparative example, step (1) of the preparation method of the flash nonwoven fabric is: the colorant, hydroxyl-terminated polybutadiene and the first solvent are mixed evenly to obtain a colored slurry, wherein the total mass of the colorant and hydroxyl-terminated polybutadiene is 20% of the mass of the colored slurry.

[0096] It should be noted that the product group allocation ratios used in the embodiments and comparative examples of this application are parts by weight, not parts by mass percentage.

[0097] The colorant in Examples 1, 4-14 and Comparative Examples 1-9 was a mixture of Phthalocyanine Green G and Permanent Yellow GR in a mass ratio of 1:1. The colorant in Example 2 was Pigment Red 254. The colorant in Example 3 was a mixture of Pigment Red 185 and 10 G Yellow in a mass ratio of 2:1.

[0098] Table 1

[0099]

[0100]

[0101] Table 2

[0102] Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Comparative Example 6 Comparative Example 7 UHWPE 95 95 95 95 95 95 95 LLDPE 3 3 3 3 3 3 3 HDPE 0.6 0.6 0.6 0.6 0.6 0.6 0.6 Colorant 1 1 1 1 1 1 1 HTPB-1 / / / / / 0.05 0.05 Alkylphenol polyoxyethylene ether / 0.05 / / / / / Sodium lignosulfonate / / 0.05 / / / / ethoxy fatty acid alcoholamines / / / 0.05 / / / Sodium methylene bis(carbamate)sulfonate / / / / 0.05 / /

[0103] To verify the performance of the colored flash nonwoven fabric of this application, the products prepared in each embodiment and comparative example were subjected to the following performance tests, the specific steps of which are as follows:

[0104] (1) Mechanical properties: The products of each embodiment and comparative example were tested in accordance with GB / T 3917.3.

[0105] (2) Resistance to hydrostatic pressure: The products of each embodiment and comparative example were tested in accordance with GB / T 4744 (pressure increase rate 6 kPa / min).

[0106] (3) Color uniformity: The products of each embodiment and comparative example were tested in accordance with GB / T 8424.3.

[0107] (4) Color fastness to rubbing: The products of each embodiment and comparative example were tested in accordance with GB / T3920.

[0108] (5) Fastness to hypochlorite bleaching: The products of each example and comparative example were tested in accordance with GB / T7069.

[0109] The test results are shown in Tables 3 and 4.

[0110] Table 3

[0111]

[0112]

[0113] Table 4

[0114] Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Comparative Example 6 Comparative Example 7 Tear strength - Direction A (N) 17 21 20 19 21 24 19 Tear strength - direction B(N) 13 16 16 17 18 20 16 Hydrostatic pressure resistance (kPa) 12.9 11.75 12.45 13.65 11.4 11.65 12.45 Color difference 6.5 5.1 5.5 5.3 4.9 2.9 3.2 Color fastness to dry rubbing 2-3 2 2-3 2 2-3 3 3-4 Hypochlorite bleaching fastness 1-2 2 2 2 2-3 2-3 2-3

[0115] As shown in Tables 3 and 4, the colored flash nonwoven fabric prepared in the embodiments of this application has good mechanical and waterproof properties. The tear strength in direction A reaches more than 21N, the tear strength in direction B reaches more than 17N, the hydrostatic pressure resistance reaches more than 12.1kPa, the color uniformity and color fastness are high, the color difference is less than 0.65, and the dry rubbing color fastness and hypochlorite bleaching fastness both reach level 4 or above.

[0116] Comparing Examples 1 and 4-7, it can be seen that the viscosity of hydroxyl-terminated polybutadiene affects the mechanical properties, waterproof properties, color difference, and color fastness of the product. When the viscosity of hydroxyl-terminated polybutadiene at 30°C is 10-30 Pa·s, the mechanical properties, waterproof properties, color difference, and color fastness of the obtained product are all improved.

[0117] Comparing Examples 1 and 8-11, it can be seen that introducing 0.4-1 parts by weight of high-density polyethylene into colored flash fiber improves the mechanical and waterproof properties of the product. However, when the amount of high-density polyethylene added is 1.5 parts by weight, the performance of the product does not continue to improve because the compatibility of the entire system with high-density polyethylene is limited.

[0118] Comparing Example 1 and Comparative Example 1, it can be seen that the colored flash fiber lacks terminal hydroxyl polybutadiene, resulting in poor mechanical properties and color fastness of the colored flash nonwoven fabric, as well as poor color uniformity.

[0119] Comparing Example 1 and Comparative Examples 1-5, it can be seen that when other additives are used as dispersants for colorants in Comparative Examples 2-5, at least one of the mechanical properties, waterproof properties, color uniformity, and color fastness of the products is significantly reduced.

[0120] Comparing Examples 1, 12-13 and 6-7, it can be seen that during the preparation process, taking the total mass of the colored slurry as 100%, if the total mass of the colorant and the hydroxyl-terminated polybutadiene is less than 5% or greater than 15%, even if the colored flash fiber formula of the product is the same, the performance of the product will not meet the standard due to the adjustment of the process.

[0121] 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 colored flash-evaporated nonwoven fabric, characterized in that, It includes colored flash fiber, which comprises the following components in parts by weight: 90-100 parts of ultra-high molecular weight polyethylene, 2-5 parts of linear low-density polyethylene, 0.5-2 parts of colorant, and 0.01-0.1 parts of hydroxyl-terminated polybutadiene. The viscosity of the hydroxyl-terminated polybutadiene at 30°C is greater than or equal to 5 Pa·s and less than or equal to 50 Pa·s. The method for preparing the colored flash nonwoven fabric is characterized by comprising the following steps: The colorant, hydroxyl-terminated polybutadiene, and the first solvent are mixed evenly to obtain a colored paste; The remaining components and colored slurry in the colored flash nonwoven fabric are added to a mixing device containing a second solvent. Then, the device is heated and nitrogen is introduced to make the temperature in 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 10MPa and less than or equal to 12MPa, to obtain a spinning solution. The spinning solution is placed in a flash spinning device for spinning to obtain colored flash nonwoven fabric.

2. The colored flash-evaporated nonwoven fabric as described in claim 1, characterized in that, The colorant is an organic pigment.

3. The colored flash-evaporated nonwoven fabric as described in claim 1, characterized in that, The linear 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.

4. The colored flash-evaporated nonwoven fabric as described in claim 1, characterized in that, The colored flash fiber also includes high-density polyethylene, and the weight percentage of high-density polyethylene in the colored flash fiber is 0.4-1.2 parts.

5. The colored flash-evaporated nonwoven fabric as described in claim 4, characterized in that, The high-density polyethylene, according to ASTM D1238, has a melt index of greater than or equal to 0.1 g / 10 min and less than or equal to 1 g / 10 min at 190 °C and 2.16 kg load.

6. A method for preparing a colored flash-evaporated nonwoven fabric as described in any one of claims 1-5, characterized in that, Includes the following steps: The colorant, hydroxyl-terminated polybutadiene, and the first solvent are mixed evenly to obtain a colored paste; The remaining components and colored slurry in the colored flash nonwoven fabric are added to a mixing device containing a second solvent. Then, the device is heated and nitrogen is introduced to make the temperature in 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 10MPa and less than or equal to 12MPa, to obtain a spinning solution. The spinning solution is placed in a flash spinning device for spinning to obtain colored flash nonwoven fabric.

7. The method for preparing colored flash-evaporated nonwoven fabric as described in claim 6, characterized in that, Based on the total mass of the colored paste being 100%, the total mass of the colorant and hydroxyl-terminated polybutadiene is 5-15%.

8. The use of the colored flash nonwoven fabric as described in any one of claims 1-5 in the preparation of cultural and creative printed materials, clothing or household products.

9. The application as described in claim 8, characterized in that, The colored flash nonwoven fabric is incorporated into the cultural and creative printed materials, clothing, or household products by at least one of the following methods: interlocking, bonding, and heat sealing.

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