A dyed flash nonwoven fabric, its preparation method and application

Abstract

This application relates to 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 provided by this application comprises the following components in parts by weight: 55-85 parts high-density polyethylene resin, 10-30 parts first polyamide resin, 1-8 parts maleic anhydride-grafted polyethylene, 1-4 parts montmorillonite, and 5-15 parts coloring masterbatch. The colored flash-evaporated nonwoven fabric provided by this application, in addition to having good color fastness, also possesses excellent moisture permeability, water resistance, and strength. Therefore, it can be effectively used in the preparation of decorative materials and daily necessities. Furthermore, the raw materials for the colored flash-evaporated nonwoven fabric provided by this application are widely available, which is beneficial for actual production.

Description

Technical Field

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

[0002] Flash nonwoven fabric is a nonwoven material made through flash spinning technology, which has advantages such as high strength, softness, moisture permeability and water resistance.

[0003] Due to the aforementioned excellent properties, flash-spun nonwoven fabrics are increasingly widely used, which in turn places different demands on them. For example, different application areas have different color requirements. Currently, flash-spun nonwoven fabrics often have their colors added or changed through printing processes. However, firstly, due to the special fiber structure and surface properties of flash-spun nonwoven fabrics, inks are difficult to penetrate evenly and adhere firmly to the fiber surface, resulting in uneven coloring or easy fading. Secondly, the inks added during the printing process may affect the fabric's breathability and moisture permeability. Thirdly, during long-term use, the inks on the printed flash-spun nonwoven fabric may gradually fade or wear due to friction, washing, and other factors, affecting the product's appearance and lifespan. Existing technologies also introduce color powder during the spinning stage, but this method can damage the strength of the flash-spun nonwoven fabric itself.

[0004] Therefore, it is urgent to find a flash nonwoven fabric that can maintain its color for a long time while also maintaining good strength, moisture permeability and water resistance. Summary of the Invention

[0005] The purpose of this application is to overcome the shortcomings of the prior art and provide a colored flash nonwoven fabric with good moisture permeability, excellent water resistance, high strength, and excellent color stability, as well as its preparation method and application.

[0006] To achieve the above objectives, in a first aspect of this application, a colored flash nonwoven fabric is provided, comprising colored flash fibers, wherein the colored flash fibers comprise the following components in parts by weight:

[0007] The composition comprises 55-85 parts high-density polyethylene resin, 10-30 parts primary polyamide resin, 1-8 parts maleic anhydride-grafted polyethylene, 1-4 parts montmorillonite, and 5-15 parts coloring masterbatch. The coloring masterbatch includes the following components in parts by weight: 60-90 parts secondary polyamide resin, 1-20 parts color powder, and 1-5 parts erucamide. The average particle size of the montmorillonite is greater than or equal to 1 μm and less than or equal to 25 μm. The average particle size of the coloring masterbatch is greater than or equal to 0.1 μm and less than or equal to 4 μm. The grafting rate of the maleic anhydride-grafted polyethylene is greater than or equal to 0.8% and less than or equal to 1.2%.

[0008] The coloring flash nonwoven fabric provided in this application, by selecting appropriate mass parts of components and combining the components with each other, results in a coloring flash nonwoven fabric with excellent moisture permeability, water resistance and high strength, and the coloring flash nonwoven fabric has high stability after coloring.

[0009] Specifically, this application introduces a coloring masterbatch, wherein the masterbatch uses a second polyamide resin as the matrix resin and simultaneously adds erucic acid amide and color powder. Firstly, the introduction of erucic acid amide not only effectively increases the uniformity of color powder dispersion in the second polyamide resin but also improves the compatibility of the color powder with the second polyamide resin, further enhancing the stability of the color powder in the second polyamide resin, thereby improving the coloring effect of the coloring masterbatch. Secondly, when the coloring masterbatch is mixed with other raw materials of the coloring flash-evaporated nonwoven fabric, erucic acid amide can also work with maleic anhydride-grafted polyethylene to further improve the dispersion of the color powder in the resin matrix and its compatibility with the resin matrix, thereby improving coloring stability. Thirdly, erucic acid amide can also form a physical cross-linking network with montmorillonite through hydrogen bonding, thereby improving the compatibility and stability of montmorillonite with the resin matrix. Simultaneously, based on the compatibility and stability of montmorillonite and the matrix resin, it can prevent montmorillonite agglomeration, thus ensuring the formation of a large number of microporous structures and improving the moisture permeability of the flash-evaporated nonwoven fabric. Fourthly, erucamide can also synergistically enhance the compatibility between high-density polyethylene resin, first polyamide resin, and second polyamide resin with maleic anhydride grafted polyethylene, thereby helping to improve the strength, moisture permeability, and water resistance of colored flash nonwoven fabrics.

[0010] It should be noted that the average particle size of the coloring masterbatch and the average particle size of montmorillonite were obtained using a laser particle size analyzer.

[0011] For example, the average particle size of the coloring masterbatch can be any point value or any two points within a range of 0.1 μm or greater and 4 μm or less, such as 0.1 μm, 0.2 μm, 0.4 μm, 0.6 μm, 0.8 μm, 1.0 μm, 1.2 μm, 1.4 μm, 1.6 μm, 1.8 μm, 2.0 μm, 2.2 μm, 2.4 μm, 2.6 μm, 2.8 μm, 3.0 μm, 3.2 μm, 3.4 μm, 3.6 μm, 3.8 μm, 4.0 μm, etc.

[0012] Preferably, the average particle size of the coloring masterbatch is greater than or equal to 1 μm and less than or equal to 2 μm.

[0013] This study found that the average particle size of the coloring masterbatch affects its compatibility and dispersibility in the resin matrix, which in turn affects the product's strength, coloring effect, and coloring stability. When the average particle size of the coloring masterbatch is further selected to be greater than or equal to 1 μm and less than or equal to 2 μm, the overall effect of the product is better.

[0014] For example, the average particle size of montmorillonite can be any point value or any two-point range value between 1 μm and 25 μm, such as 1 μm, 3 μm, 5 μm, 7 μm, 9 μm, 11 μm, 13 μm, 15 μm, 17 μm, 19 μm, 21 μm, 23 μm, 25 μm, etc.

[0015] This study found that the average particle size of montmorillonite not only affects the permeability of the product, but also its strength. When the average particle size of montmorillonite is further selected within the above range, the overall performance of the obtained product is even better.

[0016] Preferably, the average particle size of montmorillonite is greater than or equal to 8 μm and less than or equal to 12 μm.

[0017] It should be noted that the grafting rate of maleic anhydride-grafted polyethylene was obtained by acid-base titration.

[0018] For example, the grafting rate of maleic anhydride-grafted polyethylene can be any point value or any two points between 0.8% and 1.2%, such as 0.8%, 0.9%, 1.0%, 1.1%, 1.2%, etc.

[0019] This study found that the choice of maleic anhydride-grafted polyethylene affects the compatibility between high-density polyethylene resin and the first polyamide resin, as well as the compatibility between high-density polyethylene resin and the coloring masterbatch. Only when the grafting rate of maleic anhydride-grafted polyethylene is selected within the range given in this application can a coloring flash-evaporated nonwoven fabric with excellent overall performance be obtained.

[0020] As a preferred embodiment of the colored flash nonwoven fabric of this application, the flash nonwoven fabric comprises the following components in parts by weight: 70-80 parts of high-density polyethylene resin, 15-20 parts of first polyamide resin, 4-6 parts of maleic anhydride grafted polyethylene, 2-3 parts of montmorillonite, and 8-12 parts of coloring masterbatch.

[0021] This study found that the mass fraction of the components in the colored flash nonwoven fabric has a significant impact on the overall performance of the product. When the mass fraction of the components in the colored flash nonwoven fabric is further selected within the above range, the overall performance of the obtained colored flash nonwoven fabric is even better.

[0022] As a preferred embodiment of the flash-evaporated nonwoven fabric of this application, the melt index of the high-density polyethylene resin is greater than or equal to 4 g / 10 min and less than or equal to 20 g / 10 min.

[0023] It should be noted that the melt index of high-density polyethylene resin (HDPE) was obtained by testing at 190°C and 2.16 kg load with reference to ASTM D1238.

[0024] For example, the melt index of high-density polyethylene resin can be any point value or any two-point range between 4 g / 10 min and 20 g / 10 min, such as 4 g / 10 min, 6 g / 10 min, 8 g / 10 min, 10 g / 10 min, 12 g / 10 min, 14 g / 10 min, 16 g / 10 min, 18 g / 10 min, 20 g / 10 min, etc.

[0025] Preferably, the melt index of the high-density polyethylene resin is greater than or equal to 10 g / 10 min and less than or equal to 15 g / 10 min.

[0026] In a preferred embodiment of the colored flash nonwoven fabric of this application, the first polyamide resin and the second polyamide resin are each independently selected from either PA6 or PA66.

[0027] As a preferred embodiment of the colored flash nonwoven fabric of this application, the melt index of the first polyamide resin is greater than or equal to 20 g / 10 min and less than or equal to 35 g / 10 min.

[0028] As a preferred embodiment of the colored flash nonwoven fabric of this application, the melt index of the second polyamide resin is greater than or equal to 4 g / 10 min and less than or equal to 10 g / 10 min.

[0029] It should be noted that the melt index of the first polyamide resin and the second polyamide resin were obtained by testing at 300℃ and 2.1kg load in accordance with GB / T3682.1.

[0030] For example, the melt index of the first polyamide resin can be any point value or any two-point range between 20 g / 10 min and 35 g / 10 min, such as 20 g / 10 min, 22 g / 10 min, 24 g / 10 min, 26 g / 10 min, 28 g / 10 min, 30 g / 10 min, 32 g / 10 min, 34 g / 10 min, 35 g / 10 min, etc.

[0031] For example, the melt index of the second polyamide resin can be any point value or any two-point range value between 4 g / 10 min and 10 g / 10 min, such as 4 g / 10 min, 6 g / 10 min, 8 g / 10 min, 10 g / 10 min, etc.

[0032] This study found that the selection of the melt index of the first polyamide resin and the second polyamide resin affects the compatibility between the resins and the dispersion of other components in the resin matrix. When the first polyamide resin and the second polyamide resin are each independently selected as either PA6 or PA66 and their melt indices are within the above-mentioned ranges, the overall effect of the obtained product is better.

[0033] As a preferred embodiment of the colored flash nonwoven fabric of this application, the method for preparing the coloring masterbatch is as follows: the second polyamide resin, color powder and erucamide are mixed evenly and then melt-extruded and granulated to obtain the coloring masterbatch.

[0034] Preferably, the melt extrusion temperature is 120–250°C and the rotation speed is 400–600 rpm.

[0035] As a preferred embodiment of the colored flash nonwoven fabric of this application, the color powder includes at least one of benzimidazolone pigments and isoindolinone pigments.

[0036] This study found that selecting the above-mentioned type of pigment can avoid the problem of poor coloring effect caused by the instability of the pigment itself during the subsequent preparation of colored flash nonwoven fabric.

[0037] For example, benzimidazole ketone pigments include any one of Pigment Brown 25, Pigment Yellow 180, Pigment Yellow 151, Pigment Yellow 183, Pigment Red HF2B, and Pigment Orange HL.

[0038] For example, isoindolinone pigments include any one of Pigment Yellow 109, Pigment Yellow 110, Pigment Yellow 138, Pigment Yellow 139, and Pigment Orange 61.

[0039] As a preferred embodiment of the colored flash nonwoven fabric of this application, the moisture permeability of the flash nonwoven fabric is greater than or equal to 4000 g / m² according to GB / T12704.1 standard. 2 ·d and less than or equal to 7000g / m 2 ·d.

[0040] As a preferred embodiment of the colored flash nonwoven fabric of this application, the flash nonwoven fabric has a water resistance of greater than or equal to 6 kPa and less than or equal to 12 kPa according to the GB / T 4744 standard.

[0041] As a preferred embodiment of the colored flash nonwoven fabric of this application, the longitudinal breaking strength of the flash nonwoven fabric is greater than or equal to 100N and less than or equal to 180N according to GB / T 3923.1 standard.

[0042] As a preferred embodiment of the colored flash nonwoven fabric of this application, the transverse breaking strength of the flash nonwoven fabric is greater than or equal to 90N and less than or equal to 170N according to GB / T 3923.1 standard.

[0043] As a preferred embodiment of the colored flash nonwoven fabric of this application, the longitudinal breaking elongation of the flash nonwoven fabric is greater than or equal to 14% and less than or equal to 25% according to GB / T 3923.1 standard.

[0044] As a preferred embodiment of the colored flash nonwoven fabric of this application, the transverse breaking elongation of the flash nonwoven fabric is greater than or equal to 10% and less than or equal to 22% according to GB / T 3923.1 standard.

[0045] As a preferred embodiment of the colored flash nonwoven fabric of this application, the flash nonwoven fabric has a dry rubbing color fastness of grade 5 and a wet rubbing color fastness of grade 4 to 5 according to GB / T 3923.1 standard.

[0046] In a second aspect, this application provides a method for preparing colored flash-evaporated nonwoven fabric, the method comprising the following steps:

[0047] (1) Preparation of spinning solution: Each component is added to a mixing device containing solvent, and then heated and nitrogen gas is introduced to make the temperature in the mixing device greater than or equal to 200℃ and less than or equal to 230℃, and the pressure greater than or equal to 10MPa and less than or equal to 12MPa, so as to obtain the spinning solution.

[0048] (2) Preparation of flash nonwoven fabric: The spinning solution is placed into the flash spinning device for spinning and the film is received by the receiving device. The resulting fiber film is cold-pressed and hot-rolled to obtain flash nonwoven fabric.

[0049] Preferably, in step (1), the melt extrusion is performed using a twin-screw extruder with a screw temperature of 100-250°C and a rotation speed of 400-600 r / min.

[0050] Preferably, the solvent has a boiling point ≤100℃.

[0051] 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.

[0052] More preferably, the mass ratio of the solid phase to the liquid phase in the spinning solution is (10-30):(70-90).

[0053] More preferably, the flash spinning device is prepared using the production equipment 300 used in the inventor's prior research and development technology CN115323628B.

[0054] 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.

[0055] In a third aspect of this application, the application of flash-evaporated nonwoven fabrics in the preparation of decorative materials and everyday consumer goods is provided.

[0056] Preferably, the decorative material includes any one of the following: wall covering fabric, floral wrapping material, or creative packaging.

[0057] Preferably, everyday items include any one of tote bags, packaging bags, and seat covers.

[0058] More preferably, the colored flash nonwoven fabric is incorporated into decorative materials or everyday items by at least one of the following methods, including but not limited to interlocking, bonding or heat sealing, and may be disposed in a specific area or as a whole.

[0059] Based on its excellent moisture permeability, water resistance, strength, and performance, the flash-spun nonwoven fabric of this application has excellent coloring effect and excellent coloring stability. It can be widely used in decorative materials and daily necessities. While ensuring the product's moisture permeability and water resistance, it also has good color effect and strength. In addition to being aesthetically pleasing, it can facilitate quick differentiation and ensure service life, which is beneficial to practical use.

[0060] Compared with the prior art, this application has the following advantages:

[0061] The colored flash-evaporated nonwoven fabric provided in this application, through the selection of appropriate mass proportions of components, exhibits excellent moisture permeability, strong water resistance, high mechanical strength, and high stability of coloring effect. Furthermore, the resulting flash-evaporated nonwoven fabric can be effectively applied in decorative materials and daily necessities. While meeting basic requirements for moisture permeability and water resistance, it allows for effective differentiation through different colors, with excellent color durability. Simultaneously, while maintaining a long-lasting color retention effect, it also possesses good strength, ensuring a long service life. Moreover, the raw materials for the colored flash-evaporated nonwoven fabric provided in this application are widely available, and the preparation method is simple to operate, facilitating practical production. Detailed Implementation

[0062] To better illustrate the purpose, technical solution, and advantages of this application, the following detailed description will be provided in conjunction with specific embodiments. Unless otherwise specified, other materials and reagents used in the embodiments are commercially available.

[0063] HDPE-1: P434350, melt index 12g / 10min, Aladdin Biochemical Technology Co., Ltd.

[0064] HDPE-2: HMA 014, melt index 4 g / 10 min, ExxonMobil.

[0065] HDPE-3: HMA 016, melt index 20g / 10min, ExxonMobil.

[0066] Polyamide 1: PA66, EPR 24, melt index 20g / 10min, Shenma Industrial Co., Ltd.

[0067] Polyamide 2: PA6, M2000, melt index 35g / 10min, Guangdong Xinhui Meida Nylon Co., Ltd.

[0068] Polyamide 3: PA66, EPR 32, melt index 8g / 10min, Shenma Industrial Co., Ltd.

[0069] Pigment 1: Pigment Red HF2B, commercially available.

[0070] Pigment 2: Pigment Orange 61, commercially available.

[0071] Maleic anhydride-grafted polyethylene 1: MC509A, maleic anhydride grafting rate 0.8%, Ningbo Nengzhiguang New Material Technology Co., Ltd.

[0072] Maleic anhydride-grafted polyethylene 2: PE-12L, maleic anhydride grafting rate 1.2%, Dongguan Shenghao Plastic Raw Materials Co., Ltd.

[0073] Maleic anhydride-grafted polyethylene 3: XUS69109.00, maleic anhydride grafting rate 0.2%, Dow Chemical Company, USA.

[0074] Maleic anhydride-grafted polyethylene 4: TY 1053H, maleic anhydride grafting rate 2%, Dow Chemical Company, USA.

[0075] Montmorillonite 1: with an average particle size of 10 μm, prepared in-house.

[0076] Montmorillonite 2: average particle size of 25 μm, self-made.

[0077] Montmorillonite 3: average particle size of 1 μm, self-made.

[0078] Montmorillonite 4: average particle size of 30 μm, self-made.

[0079] Montmorillonite 5: average particle size 0.1 μm, self-made.

[0080] Erucamide: Commercially available.

[0081] The montmorillonite used was purchased from Tuoyi New Materials (Guangzhou) Co., Ltd. as inorganic montmorillonite, which was then ground, pulverized, and screened to obtain the corresponding montmorillonite 1 to 5.

[0082] The mass fractions of the coloring masterbatch components are shown in Table 1.

[0083] Table 1

[0084]

[0085] The preparation method of coloring masterbatch 1 is as follows: the components are added to a high-speed mixer and mixed evenly, then melt-extruded and granulated to obtain coloring masterbatch 1; wherein the melt extrusion temperature is 100-250℃ and the rotation speed is 500rpm.

[0086] The preparation methods of coloring masterbatches 2 to 9 are consistent with those of coloring masterbatches 1; the average particle size can be controlled by the parameters of the granulation process, and the coloring masterbatches with the corresponding average particle size are obtained by subsequent crushing and sieving.

[0087] Examples 1-13 and Comparative Examples 1-9

[0088] The embodiments and comparative examples of this application provide a colored flash nonwoven fabric, the components (parts by mass) of which are shown in Tables 2 to 4.

[0089] Table 2

[0090]

[0091]

[0092] Table 3

[0093]

[0094] Table 4

[0095]

[0096]

[0097] The method for preparing flash-evaporated nonwoven fabric provided in Example 1 includes the following steps:

[0098] (1) Masterbatch preparation: Mix the components and then transfer them to a twin-screw extruder for melt extrusion granulation at 90-180℃ to obtain the masterbatch. The temperature settings of the twin-screw extruder are: Zone 1 90-110℃, Zone 2 120-130℃, Zone 3 150-160℃, Zone 4 170-180℃, Zone 5 170-185℃, Zone 6 170-185℃, Zone 7 160-165℃, Zone 8 160-165℃, Zone 9 160-165℃, Zone 10 160-165℃. The screw speed of the twin-screw extruder is 180-220 rpm.

[0099] (2) Preparation of spinning solution: The masterbatch was transferred to a reaction vessel containing a mixed solvent (15%:85%) of difluorochloromethane and tetrafluorodichloroethane. The mixture was preheated to 180°C, then nitrogen gas was introduced to pressurize it to 12 MPa, and finally the temperature was raised to 225°C and stirred in a closed container for 2 hours. After the temperature stabilized, the spinning solution was obtained. The mass ratio of solid phase to liquid phase in the spinning solution was 15:85.

[0100] (3) Preparation of flash nonwoven fabric: Referring to CN115323628B, 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 flash nonwoven fabric with a thickness of about 0.12 mm.

[0101] The preparation methods of the flash-evaporated nonwoven fabrics provided in Examples 2-13 and Comparative Examples 1-9 are consistent with the preparation method in Example 1.

[0102] Example of effect

[0103] The performance of the colored flash-evaporated nonwoven fabrics prepared in Examples 1-13 and Comparative Examples 1-9, as verified by this application, includes the following steps:

[0104] (1) Moisture permeability: Tested according to GB / T 12704.1 standard.

[0105] (2) Water resistance: Tested in accordance with GB / T 4744 standard.

[0106] (3) Breaking strength and elongation at break: Tested according to GB / T 3923.1.

[0107] (4) Color fastness test for wet and dry rubbing: The test shall be conducted in accordance with GB / T3920; the moisture content of the rubbing cloth shall be 65% in the wet rubbing color fastness test, and the color fastness shall be determined by grade, with grade 1 being the worst and grade 5 being the best.

[0108] The test results are shown in Table 5.

[0109] Table 5

[0110]

[0111]

[0112] As can be seen from Table 5, when the technical solution provided in this application is adopted, the resulting colored flash nonwoven fabric has excellent comprehensive properties, including high moisture permeability, good water resistance, high tensile strength, excellent elongation at break, and strong coloring properties. Specifically, the obtained moisture permeability is between 8042 and 9920 g / (m²). 2 The water resistance is between 6.06 and 10.07 kPa, the longitudinal breaking strength is between 125 and 192 N, the transverse breaking strength is between 103 and 175 N, the longitudinal breaking elongation is between 7.1 and 15.0%, the transverse breaking elongation is between 7.0 and 12.2%, and the color fastness test is grade 5 for dry rubbing and grade 4 and 5 for wet rubbing.

[0113] As can be seen from Examples 1, 8, and Comparative Examples 1-2, the grafting rate of maleic anhydride-grafted polyethylene affects the performance of the product. When the grafting rate of maleic anhydride-grafted polyethylene is outside the range given in this application, the overall performance of the obtained product decreases significantly. As can be seen from Examples 1, 9-10, and Comparative Examples 3-4, the average particle size of montmorillonite also affects the overall performance of the product. When the average particle size of montmorillonite is outside the range given in this application, the overall performance of the obtained product decreases significantly. As can be seen from Examples 1, 11-13, and Comparative Examples 5-9, the coloring masterbatch also affects the overall performance of the product.

[0114] 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, The colored flash-evaporated nonwoven fabric comprises colored flash-evaporated fibers, which include the following components in parts by weight: 55-85 parts of high-density polyethylene resin, 10-30 parts of first polyamide resin, 1-8 parts of maleic anhydride grafted polyethylene, 1-4 parts of montmorillonite, and 5-15 parts of coloring masterbatch. The coloring masterbatch comprises the following components in parts by weight: 60-90 parts of second polyamide resin, 1-20 parts of color powder, and 1-5 parts of erucamide; The average particle size of the montmorillonite is greater than or equal to 1 μm and less than or equal to 25 μm; The average particle size of the coloring masterbatch is greater than or equal to 0.1 μm and less than or equal to 4 μm; The grafting rate of the maleic anhydride-grafted polyethylene is greater than or equal to 0.8% and less than or equal to 1.2%.

2. The flash-evaporated nonwoven fabric according to claim 1, characterized in that, The flash-spun nonwoven fabric comprises the following components in parts by weight: 70-80 parts of high-density polyethylene resin, 15-20 parts of first polyamide resin, 4-6 parts of maleic anhydride-grafted polyethylene, 2-3 parts of montmorillonite, and 8-12 parts of coloring masterbatch.

3. The flash-evaporated nonwoven fabric according to claim 1, characterized in that, The melt flow index of the high-density polyethylene resin is greater than or equal to 4 g / 10 min and less than or equal to 20 g / 10 min.

4. The flash-evaporated nonwoven fabric according to claim 1, characterized in that, The first polyamide resin and the second polyamide resin are each independently selected from either PA6 or PA66; And / or, the melt index of the first polyamide resin is greater than or equal to 20 g / 10 min and less than or equal to 35 g / 10 min; And / or, the melt index of the second polyamide resin is greater than or equal to 4 g / 10 min and less than or equal to 10 g / 10 min.

5. The flash-evaporated nonwoven fabric according to claim 1, characterized in that, The pigments include at least one of benzimidazolone pigments and isoindolinone pigments.

6. The flash-evaporated nonwoven fabric according to claim 1, characterized in that, The coloring masterbatch is prepared by mixing the second polyamide resin, color powder and erucamide evenly, then melting, extruding and granulating to obtain the coloring masterbatch.

7. The flash-evaporated nonwoven fabric according to claim 1, characterized in that, The moisture permeability of the flash-evaporated nonwoven fabric is greater than or equal to 4000 g / m² according to GB / T12704.1 standard. 2 ·d and less than or equal to 7000g / m 2 ·d; And / or, the flash-evaporated nonwoven fabric has a water resistance of greater than or equal to 6 kPa and less than or equal to 12 kPa according to GB / T 4744 standard; And / or, the longitudinal breaking strength of the flash-spun nonwoven fabric is greater than or equal to 100N and less than or equal to 180N according to GB / T 3923.1 standard; And / or, the transverse breaking strength of the flash nonwoven fabric is greater than or equal to 90N and less than or equal to 170N according to GB / T 3923.1 standard; And / or, the longitudinal elongation at break of the flash-spun nonwoven fabric is greater than or equal to 14% and less than or equal to 25% according to GB / T 3923.1 standard; And / or, the transverse elongation at break of the flash-spun nonwoven fabric is greater than or equal to 10% and less than or equal to 22% according to GB / T 3923.1 standard; And / or, the flash-dried nonwoven fabric has a dry rubbing color fastness of grade 5 and a wet rubbing color fastness of grade 4-5 according to GB / T 3923.1 standard.

8. The method for preparing flash-evaporated nonwoven fabric according to any one of claims 1 to 7, characterized in that, The preparation method includes the following steps: (1) Preparation of spinning solution: Add each component to a mixing device containing solvent, then heat and introduce nitrogen gas to make the temperature in the mixing device greater than or equal to 200℃ and less than or equal to 230℃, and the pressure greater than or equal to 10MPa and less than or equal to 12MPa, to obtain the spinning solution. (2) Preparation of flash nonwoven fabric: The spinning solution is placed into the flash spinning device for spinning and the film is received by the receiving device. The resulting fiber film is cold-pressed and hot-rolled to obtain flash nonwoven fabric.

9. The use of the flash-spun nonwoven fabric as described in any one of claims 1 to 7 in the preparation of decorative materials and daily necessities.

10. The application according to claim 9, characterized in that, The decorative materials include any one of the following: wall decoration fabric, floral wrapping materials, and cultural and creative cover packaging. And / or, the everyday items include any one of tote bags, packaging bags, and seat covers.

Images