Flash-spun polyethylene film material with good toughness and manufacturing method therefor

Abstract

The present invention relates to a flash-spun polyethylene film material with a good toughness and a manufacturing method therefor. The raw materials thereof comprise polyethylene. The gram weight G of the flash-spun polyethylene film material is greater than 50 g / m2; the initial toughness Z0 of the flash-spun polyethylene film material is 20-35 (N·m) / g; and Z0=[RM×EM+RT×ET] / G, wherein RM is the tensile strength in the MD direction, RT is the tensile strength in the TD direction, EM is the tensile elongation in the MD direction, and ET is the tensile elongation in the TD direction. The flash-spun polyethylene film material is exposed in a dry and hot atmosphere at 90ºC for 6 hours, and is then cooled under the conditions of a temperature of 25ºC and a relative humidity of 65% for 24 hours, and the light transmittance thereof is measured to be 8-13%. The testing of the light transmittance is performed according to GBT2410-2008, and the light transmittance is the ratio of the luminous flux of light penetrating a sample to the luminous flux of light emitted onto the sample, and is expressed as a percentage. The flash-spun polyethylene film material of the present application has a relatively good toughness.

Description

A flash-spun polyethylene film material with better toughness and its manufacturing method Technical Field

[0001] The present invention belongs to the field of flash evaporation technology, and in particular relates to a flash-spun polyethylene film material with better toughness and a manufacturing method thereof. Background Art

[0002] Research on the mechanical properties of membrane materials began in the 1980s, with leading countries in the membrane structure field, such as Europe, the United States, and Japan, conducting extensive research. Germany's Rain Blom Laboratory, Europe's largest laboratory for the mechanical properties of membrane materials, has established unified test methods for determining strength indicators such as tensile strength, tear strength, and peel strength, as well as engineering constants such as elastic modulus, Poisson's ratio, and shear modulus through biaxial tension testing. These methods have been adopted by industry organizations such as Tensinet. Japan also developed unified test standards for membrane material properties in 1993, 1995, and 2003. These tests cover strength indicators, engineering constants, and performance tests under long-term operating conditions, including creep, stress relaxation, folding resistance, high and low temperature, waterproofing, and weathering resistance.

[0003] In 1997, Shanghai's 80,000-seat Sports Stadium adopted membrane structures (skeleton membrane structures). Membrane structures have been developed in my country for nearly a decade, with significant progress in both design and engineering applications. In terms of design and calculation, numerous universities and other research institutions have conducted in-depth theoretical research on form-finding, force analysis, and cutting analysis of membrane structures. They have developed relevant software, which has been extensively applied in engineering practice. Based on domestic and international application experience, membrane structure regulations have been compiled to guide membrane structure design and construction. In terms of engineering application, from early small-scale membrane structures to large-scale structures such as stadiums and exhibition halls, structural forms have now included tensile membrane structures, skeleton membrane structures, and inflatable membrane structures. In terms of membrane materials, PVC membranes, PTFE membranes, and the latest PE membranes have all been used. PVC membranes are widely used in early and small-scale membrane structures, while PTFE membranes are primarily used in large, iconic membrane structures. ETFE membranes were first used in China with the Beijing Olympic Aquatics Center.

[0004] PVC film is inexpensive and available in a variety of colors, including white, red, blue, and green, making it widely used. It's soft and has good tensile properties, making it easy to stretch and stretch, and highly adaptable to cutting errors. However, its durability and self-cleaning properties are relatively poor. As the material ages, its properties change due to the migration of coating enhancers and the effects of ultraviolet light, causing the surface to gradually turn yellow and become sticky. Dust and dirt in the air adhere to the film surface, making it dirty and reducing light transmittance, thereby shortening its service life. To improve the durability and self-cleaning properties of this type of film, a topcoat of polyvinyl fluoride (PVF) or polyvinylidene fluoride (PVDF) can be added to the coating.

[0005] PTFE membranes offer excellent durability and resist yellowing or mildewing in atmospheric environments. Furthermore, PTFE architectural membranes are self-cleaning, meaning rainwater forms beads on their surface and flows away. However, they are relatively expensive and have a high degree of rigidity. Rolling and folding during transportation and construction can reduce their strength, making them difficult to install and requiring precise calculations during the design and cutting process.

[0006] PE film materials are formed by biaxial stretching and are divided into wet and dry processes. As for PE film materials formed by the flash vaporization method, DuPont was the first to discover it in 1960 and then promoted its application. DuPont has monopolized this technology to this day. Our company started the research and development of the flash vaporization method in 2014, established a pilot production line in 2020, and launched large-scale mass production in 2022. Through research, it was found that the existing flash vaporization film materials have technical problems such as insufficient toughness and poor light transmittance. This application overcomes the bottlenecks of the existing technology and expands its scope of application by adding functional particles and improving the spinning process.

[0007] U.S. Patent Publication No. US20200274122A1 relates to a separator medium for an electrochemical cell comprising at least one nonwoven polymer fiber sheet. The nonwoven sheet has a surface area of ​​about 0.5 to about 1.5 m² / g, a maximum pore size equal to or greater than 2.5 times the mean flow pore size, and greater than 11 times the minimum pore size. The sheet can be sulfonated to a level of 0.67% and, after sulfonation, exhibits superior tensile properties compared to previously known separators.

[0008] U.S. Patent US20190160782A1 relates to a non-fiber-oriented polyethylene monolayer comprising ultra-high molecular weight polyethylene, wherein the polyethylene has a viscosity-average molecular weight of 2,000,000 or greater, wherein (i) the monolayer has a width of 10.0 mm or greater and a modulus / tex of at least 100 N, (ii) when measured in dynamic mechanical analysis (DMA) of tensile response in a frequency sweep between 0.1 Hz ≤ f ≤ 1.0 Hz, the monolayer has a tan δ that satisfies the inequality tan δ < 1 / (f×a), and (iii) the monolayer has a maximum area weight of not more than 45 gsm.

[0009] European Patent EP3736126A1 relates to a package for providing a sterilizable closed internal environment, and a breathable fibrous nonwoven sheet structure for use in such a structure, wherein the nonwoven sheet structure has at least one surface having a pre-sealed embossed pattern; and a particle barrier penetration rate of less than 10%, a Gurley Hill porosity of 40 seconds or less, and a moisture vapor transmission rate of 3500 g / m 2 / day or higher.

[0010] The present invention relates to improved plexifilamentary sheet materials for protective apparel and filter media, the material being composed of substantially continuous polyethylene plexifilamentary fiber bundles and having a Frazier permeability normalized to 1.0 ounce per yard of at least 2 cfm / ft 2 .

[0011] However, there is no research in the prior art on how to adjust and change the toughness and transmittance of the flash film material.

[0012] Summary of the Invention

[0013] The object of the present invention is to provide a flash spun polyethylene film material with better toughness in order to solve the above problems.

[0014] Another object of the present invention is to provide a method for manufacturing a flash-spun polyethylene film material with better tenacity in order to solve the above-mentioned problems.

[0015] In order to achieve the above object, the present invention adopts the following technical solutions:

[0016] A flash-spun polyethylene film material with better toughness, characterized in that its raw material comprises polyethylene,

[0017] The gram weight G of the flash spun polyethylene film material is greater than 50g / m 2 ;

[0018] The initial toughness Z0 of the flash-spun polyethylene membrane material is 20 to 35 (N·m) / g;

[0019] Z0=[RM ×E M +R T ×E T ] / G;

[0020] in:

[0021] R M is the tensile strength in the MD direction;

[0022] R T is the tensile strength in TD direction;

[0023] E M is the tensile elongation in the MD direction;

[0024] E T is the tensile elongation in TD direction;

[0025] The flash-spun polyethylene film material was exposed to a dry heat atmosphere at 90°C for 6 hours, and then cooled at 25°C and 65% relative humidity for 24 hours; the light transmittance was then measured to be 8% to 13%;

[0026] The light transmittance test is carried out according to GBT2410-2008. The light transmittance is the ratio of the luminous flux passing through the sample to the luminous flux incident on the sample, expressed as a percentage.

[0027] The tensile strength is measured according to the national standard GB / T 12914-2018. The tensile strength is the maximum tension that a specimen of unit width can withstand before breaking under specified test conditions. It is specifically divided into the tensile strength and elongation of the sample in the longitudinal direction (MD), and the tensile strength and elongation of the sample in the transverse direction (TD).

[0028] The initial toughness Z0 of the flash-spun polyethylene film material is 20-25 (N·m) / g.

[0029] The initial toughness Z0 of the flash-spun polyethylene film material is 25 to 30 (N·m) / g.

[0030] The initial toughness Z0 of the flash-spun polyethylene film material is 30-35 (N·m) / g.

[0031] The light transmittance of the flash-spun polyethylene film material is 8% to 9%.

[0032] The light transmittance of the flash-spun polyethylene film material is 9% to 10%.

[0033] The light transmittance of the flash-spun polyethylene film material is 10% to 11%.

[0034] A flash-spun polyethylene film material with better toughness, characterized in that the toughness change value ●Z of the flash-spun polyethylene film material is 15% to 25%;

[0035] Where: ●Z=[Z0-Z 10 ] / Z0*100%

[0036] Z0 is the initial toughness, which is the Z0 of the sample = [R M ×E M +R T ×E T ] / G;

[0037] Z 10 is the final toughness Z after high temperature treatment 10 , Z 10 =[R M10 ×E M10 +R T10 ×E T10 ] / G;

[0038] The process flow of high temperature treatment is:

[0039] (1) The sample was placed at 25°C and 65% relative humidity for 24 hours, and then the tensile strength R in the MD direction of the sample was measured. M , tensile strength R in TD direction T , tensile elongation in MD direction E M , tensile elongation in TD direction E T ; Then calculate Z0 according to the formula;

[0040] (2) then exposed to a dry heat atmosphere at 90°C for 6 hours, and then cooled at 25°C and 65% relative humidity for 24 hours;

[0041] (3) Repeat step (2) for nine more treatments and then measure the tensile strength R in the MD direction of the sample. M10 , tensile strength R in TD direction T10 , tensile elongation in MD direction E M10 , tensile elongation in TD direction E T10 ; Then calculate Z according to the formula 10 .

[0042] The toughness change value ●Z of the flash-spun polyethylene film material is 15% to 20%.

[0043] The toughness change value ●Z of the flash-spun polyethylene film material is 20% to 25%.

[0044] The gram weight G of the flash spun polyethylene film material is greater than 60g / m 2 .

[0045] The gram weight G of the flash spun polyethylene film material is less than 120g / m 2 .

[0046] The gram weight G of the flash spun polyethylene film material is less than 100g / m 2 .

[0047] The gram weight G of the flash spun polyethylene film material is less than 80g / m 2 .

[0048] A method for manufacturing a flash-spun polyethylene film material with better toughness, the specific steps of which are:

[0049] (1) Production of flash spinning solution:

[0050] Add the spinning raw materials and spinning solvent into a high-pressure reactor, then heat it to 160-180°C; after the heating is completed, introduce nitrogen and pressurize it to 12.5-13 MPa; finally, heat it to 200-230°C to obtain a flash spinning solution;

[0051] The spinning feedstock includes polyethylene and tough particles;

[0052] The mass fraction of tough particles in the spinning raw materials is 1.5% to 2.5%;

[0053] The tough particles are wrinkled graphene oxide microspheres with a specific surface area of ​​230m 2 / g~250m 2 / g, and the density is only 40-50 mg / cm 3 ; The wrinkled graphene oxide microspheres use their special wrinkled structure to act as a buffer when the product is subjected to external force, thereby improving the tensile strength.

[0054] The spinning solvents are aromatic hydrocarbons, unsaturated hydrocarbons, halogenated hydrocarbons, alcohols, esters, ethers, ketones, fluorocarbons, etc. The spinning solvents are dichloromethane, 1,1-dichloro-2,2,2-trifluoroethane, monochlorodichloromethane, and 1H-perfluorohexane, and the mass ratio of the four is 6:2:1:1.

[0055] The mass fraction of the spinning raw materials in the flash spinning solution is 7% to 17%.

[0056] (2) Manufacturing of flash-spun polyethylene film materials:

[0057] The flash spinning solution produced in step (1) is passed through a decompression chamber, a spinning assembly is provided at the outlet of the decompression chamber, the flash spinning solution is flash-spun by the spinning assembly to obtain flash-spun fibers, and the flash-spun fibers enter the laying system through the spinning baffle to obtain grey cloth; the grey cloth is preliminarily pre-pressed by a pre-pressing upper roller and a pre-pressing lower roller, then enters a water tank, and then passes through a transmission roller, and the sizing rate is controlled by a left squeeze roller and a right squeeze roller to obtain a slurry-containing grey cloth; the slurry-containing grey cloth is sequentially passed through a preheating rolling upper roller, a preheating rolling lower roller, a hot rolling upper roller, a hot rolling lower roller, a pre-calendering upper roller, a pre-calendering lower roller, a calendering upper roller, a calendering lower roller, and finally passed through a winder to obtain a flash-spun polyethylene film material;

[0058] The water tank contains a deionized water solution containing a surfactant. When the deionized water solution is pure deionized water, localized bright spots may occur during the subsequent hot pressing process. This is mainly due to the uneven dispersion of the deionized water in the felt. This application overcomes this dispersion problem by adding a surfactant, thereby reducing the occurrence of localized bright spots. The purpose of adding a water tank treatment process is to allow the water vapor in the pulp-containing fabric to penetrate the fibers during hot rolling, thereby improving heat transfer efficiency, uniform bonding, and thus uniform product distribution and increasing tensile strength.

[0059] The mass fraction of the surfactant in the deionized water solution is 15% to 25%;

[0060] The surfactant is diacetylpiperazine quaternary ammonium salt Gemini surfactant;

[0061] The sizing rate is 8% to 14%, wherein the sizing rate is calculated as: [(wet weight - dry weight) / dry weight] * 100%

[0062] The hot rolling temperature of the preheat rolling upper bar and the preheat rolling lower bar is 104-106℃;

[0063] The hot rolling temperature of the hot rolling upper bar and the hot rolling lower bar is 109-111°C;

[0064] The hot rolling temperature of the pre-calendered upper roll and the pre-calendered lower roll is 114-116°C;

[0065] The hot rolling temperature of the calendering upper roll and the calendering lower roll is 119-121°C.

[0066] Compared with the prior art, the present invention has the following positive effects:

[0067] 1. The present invention has found that by adding a certain amount of tough particles to the spinning raw materials, the toughness of the final product can be significantly affected, and the transmittance can also be affected to a certain extent.

[0068] 2. The present invention treats the grey cloth with a deionized water solution of a surfactant, mainly utilizing the high heat transfer efficiency of water vapor. During hot rolling and calendering, water vapor easily passes through the fibers, making them evenly bonded and evenly distributed in the product, thereby affecting its toughness and light transmittance. BRIEF DESCRIPTION OF THE DRAWINGS

[0069] FIG1 is a schematic structural diagram of the present invention;

[0070] In the figure: spinning assembly 1, baffle 2, flash fiber 3, web laying machine 4, guide roller 5, water trough 6, pre-pressing upper roller 10, pre-pressing lower roller 11, transmission roller 12, left extrusion roller 13, right extrusion roller 14, preheating rolling upper roller 15, preheating rolling lower roller 16, hot rolling upper roller 17, hot rolling lower roller 18, pre-calendering upper roller 19, pre-calendering lower roller 20, calendering upper roller 21, calendering lower roller 22, and winder 23. DETAILED DESCRIPTION

[0071] The present invention will be further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0072] Example 1

[0073] This embodiment provides a method for manufacturing a flash-spun polyethylene film material with better toughness, as shown in FIG1 , and the specific steps are as follows:

[0074] (1) Production of flash spinning solution:

[0075] Add the spinning raw materials and spinning solvent into the autoclave, then heat it to 160°C; after heating, introduce nitrogen and pressurize it to 12.5MPa; finally, heat it to 200°C to obtain the flash spinning solution;

[0076] The spinning feedstock includes polyethylene and tough particles;

[0077] The mass fraction of tough particles in the spinning raw materials is 1.5%;

[0078] The tough particles are wrinkled graphene oxide microspheres with a specific surface area of ​​230m 2 / g~250m 2 / g, and the density is only 40-50 mg / cm 3 ; The wrinkled graphene oxide microspheres use their special wrinkled structure to act as a buffer when the product is subjected to external force, thereby improving the tensile strength.

[0079] The wrinkled graphene oxide microspheres are prepared by the following method: adding graphite powder to sulfuric acid and stirring evenly, then sequentially adding potassium ferrate and hydrogen peroxide solution for intercalation oxidation, separating, washing and drying to obtain graphene oxide, and rapidly heating the graphene oxide in a nitrogen atmosphere and calcining at high temperature to obtain wrinkled graphene oxide microspheres.

[0080] The spinning solvents are dichloromethane, 1,1-dichloro-2,2,2-trifluoroethane, monochlorodichloromethane, and 1H-perfluorohexane, and the mass ratio of the four is 6:2:1:1.

[0081] The mass fraction of the spinning raw material in the flash spinning solution is 8%.

[0082] (2) Manufacturing of flash-spun polyethylene film materials:

[0083] The flash spinning solution produced in step (1) is passed through a decompression chamber, a spinning assembly 1 is provided at the outlet of the decompression chamber, the flash spinning solution is flash-spun by the spinning assembly to obtain flash-spun fibers, and the flash-spun fibers 3 enter the laying system 4 through the spinning baffle 2 to obtain a grey cloth; the grey cloth is preliminarily pre-pressed by a pre-pressing upper roller 10 and a pre-pressing lower roller 11, and then enters the water tank 6, and then passes through a transmission roller 12, and the sizing rate is controlled by a left squeeze roller 13 and a right squeeze roller 14 to obtain a slurry-containing grey cloth; the slurry-containing grey cloth is sequentially passed through a preheating rolling upper roller 15, a preheating rolling lower roller 16, a hot rolling upper roller 17, a hot rolling lower roller 18, a pre-calendering upper roller 19, a pre-calendering lower roller 20, a calendering upper roller 21, a calendering lower roller 22, and finally passes through a winder 23 to obtain a flash-spun polyethylene film material;

[0084] The water tank contains a deionized water solution containing a surfactant. When the deionized water solution is pure deionized water, localized bright spots may occur during the subsequent hot pressing process. This is mainly due to the uneven dispersion of the deionized water in the felt. This application overcomes this dispersion problem by adding a surfactant, thereby reducing the occurrence of localized bright spots.

[0085] The mass fraction of the surfactant in the deionized water solution is 15%;

[0086] The surfactant is diacetylpiperazine quaternary ammonium salt Gemini surfactant;

[0087] The sizing rate is 9%, where the sizing rate is calculated as: [(wet weight - dry weight) / dry weight] * 100%

[0088] The hot rolling temperature of the preheat rolling upper rod 15 and the preheat rolling lower rod 16 is 104°C;

[0089] The hot rolling temperature of the hot rolling upper rod 17 and the hot rolling lower rod 18 is 109°C;

[0090] The hot rolling temperature of the pre-calendered upper roller 19 and the pre-calendered lower roller 20 is 114°C;

[0091] The hot rolling temperature of the calendering upper roll 21 and the calendering lower roll 22 is 119°C.

[0092] The test results of this embodiment are shown in Table 1.

[0093] Example 2

[0094] This embodiment provides a method for manufacturing a flash-spun polyethylene film material with better toughness, as shown in FIG1 , and the specific steps are as follows:

[0095] (1) Production of flash spinning solution:

[0096] The spinning raw materials and spinning solvent are added to the autoclave, and then the temperature is raised to 170°C. After the temperature is raised, nitrogen is introduced and the pressure is increased to 12.8 MPa. Finally, the temperature is raised to 215°C to obtain a flash spinning solution.

[0097] The spinning feedstock includes polyethylene and tough particles;

[0098] The mass fraction of tough particles in the spinning raw materials is 2%;

[0099] The tough particles are wrinkled graphene oxide microspheres with a specific surface area of ​​230m 2 / g~250m 2 / g, and the density is only 40-50 mg / cm 3 ; The wrinkled graphene oxide microspheres use their special wrinkled structure to act as a buffer when the product is subjected to external force, thereby improving the tensile strength.

[0100] The manufacturing method of wrinkled graphene oxide microspheres is the same as that in Example 1, so it will not be repeated here.

[0101] The spinning solvents are dichloromethane, 1,1-dichloro-2,2,2-trifluoroethane, monochlorodichloromethane, and 1H-perfluorohexane, and the mass ratio of the four is 6:2:1:1.

[0102] The mass fraction of the spinning raw material in the flash spinning solution is 11%.

[0103] (2) Manufacturing of flash-spun polyethylene film materials:

[0104] The flash spinning solution produced in step (1) is passed through a decompression chamber, a spinning assembly 1 is provided at the outlet of the decompression chamber, the flash spinning solution is flash-spun by the spinning assembly to obtain flash-spun fibers, and the flash-spun fibers 3 enter the laying system 4 through the spinning baffle 2 to obtain a grey cloth; the grey cloth is preliminarily pre-pressed by a pre-pressing upper roller 10 and a pre-pressing lower roller 11, and then enters the water tank 6, and then passes through a transmission roller 12, and the sizing rate is controlled by a left squeeze roller 13 and a right squeeze roller 14 to obtain a slurry-containing grey cloth; the slurry-containing grey cloth is sequentially passed through a preheating rolling upper roller 15, a preheating rolling lower roller 16, a hot rolling upper roller 17, a hot rolling lower roller 18, a pre-calendering upper roller 19, a pre-calendering lower roller 20, a calendering upper roller 21, a calendering lower roller 22, and finally passes through a winder 23 to obtain a flash-spun polyethylene film material;

[0105] The water tank contains a deionized water solution containing a surfactant. When the deionized water solution is pure deionized water, localized bright spots may occur during the subsequent hot pressing process. This is mainly due to the uneven dispersion of the deionized water in the felt. This application overcomes this dispersion problem by adding a surfactant, thereby reducing the occurrence of localized bright spots.

[0106] The mass fraction of the surfactant in the deionized water solution is 20%;

[0107] The surfactant is diacetylpiperazine quaternary ammonium salt Gemini surfactant;

[0108] The sizing rate is 11%, where the sizing rate is calculated as: [(wet weight - dry weight) / dry weight] * 100%

[0109] The hot rolling temperature of the preheat rolling upper rod 15 and the preheat rolling lower rod 16 is 105°C;

[0110] The hot rolling temperature of the hot rolling upper rod 17 and the hot rolling lower rod 18 is 110°C;

[0111] The hot rolling temperature of the pre-calendered upper roller 19 and the pre-calendered lower roller 20 is 115°C;

[0112] The hot rolling temperature of the calendering upper roll 21 and the calendering lower roll 22 is 120°C.

[0113] The test results of this embodiment are shown in Table 1.

[0114] Example 3

[0115] This embodiment provides a method for manufacturing a flash-spun polyethylene film material with better toughness, as shown in FIG1 , and the specific steps are as follows:

[0116] (1) Production of flash spinning solution:

[0117] The spinning raw materials and spinning solvent are added to the autoclave, and then the temperature is raised to 180°C. After the temperature is raised, nitrogen is introduced and the pressure is increased to 13 MPa. Finally, the temperature is raised to 230°C to obtain a flash spinning solution.

[0118] The spinning feedstock includes polyethylene and tough particles;

[0119] The mass fraction of tough particles in the spinning raw materials is 2.5%;

[0120] The tough particles are wrinkled graphene oxide microspheres with a specific surface area of ​​230m 2 / g~250m 2 / g, and the density is only 40-50 mg / cm 3 ; The wrinkled graphene oxide microspheres use their special wrinkled structure to act as a buffer when the product is subjected to external force, thereby improving the tensile strength.

[0121] The manufacturing method of wrinkled graphene oxide microspheres is the same as that in Example 1, so it will not be repeated here.

[0122] The spinning solvents are dichloromethane, 1,1-dichloro-2,2,2-trifluoroethane, monochlorodichloromethane, and 1H-perfluorohexane, and the mass ratio of the four is 6:2:1:1.

[0123] The mass fraction of the spinning raw material in the flash spinning solution is 15%.

[0124] (2) Manufacturing of flash-spun polyethylene film materials:

[0125] The flash spinning solution produced in step (1) is passed through a decompression chamber, a spinning assembly 1 is provided at the outlet of the decompression chamber, the flash spinning solution is flash-spun by the spinning assembly to obtain flash-spun fibers, and the flash-spun fibers 3 enter the laying system 4 through the spinning baffle 2 to obtain a grey cloth; the grey cloth is preliminarily pre-pressed by a pre-pressing upper roller 10 and a pre-pressing lower roller 11, and then enters the water tank 6, and then passes through a transmission roller 12, and the sizing rate is controlled by a left squeeze roller 13 and a right squeeze roller 14 to obtain a slurry-containing grey cloth; the slurry-containing grey cloth is sequentially passed through a preheating rolling upper roller 15, a preheating rolling lower roller 16, a hot rolling upper roller 17, a hot rolling lower roller 18, a pre-calendering upper roller 19, a pre-calendering lower roller 20, a calendering upper roller 21, a calendering lower roller 22, and finally passes through a winder 23 to obtain a flash-spun polyethylene film material;

[0126] The water tank contains a deionized water solution containing a surfactant. When the deionized water solution is pure deionized water, localized bright spots may occur during the subsequent hot pressing process. This is mainly due to the uneven dispersion of the deionized water in the felt. This application overcomes this dispersion problem by adding a surfactant, thereby reducing the occurrence of localized bright spots.

[0127] The mass fraction of the surfactant in the deionized water solution is 24%;

[0128] The surfactant is diacetylpiperazine quaternary ammonium salt Gemini surfactant;

[0129] The sizing rate is 13%, where the sizing rate is calculated as: [(wet weight - dry weight) / dry weight] * 100%

[0130] The hot rolling temperature of the preheat rolling upper rod 15 and the preheat rolling lower rod 16 is 106°C;

[0131] The hot rolling temperature of the hot rolling upper rod 17 and the hot rolling lower rod 18 is 111°C;

[0132] The hot rolling temperature of the pre-calendered upper roller 19 and the pre-calendered lower roller 20 is 116°C;

[0133] The hot rolling temperature of the calendering upper roll 21 and the calendering lower roll 22 is 121°C.

[0134] The test results of this embodiment are shown in Table 1.

[0135] Comparative Example 1

[0136] This comparative example provides a method for manufacturing a flash-spun polyethylene film material, as shown in FIG1 , and the specific steps are as follows:

[0137] (1) Production of flash spinning solution:

[0138] The spinning raw materials and spinning solvent are added to the autoclave, and then the temperature is raised to 170°C. After the temperature is raised, nitrogen is introduced and the pressure is increased to 12.8 MPa. Finally, the temperature is raised to 215°C to obtain a flash spinning solution.

[0139] The spinning feedstock includes polyethylene and tough particles;

[0140] The mass fraction of tough particles in the spinning raw materials is 2%;

[0141] The tough particles are wrinkled graphene oxide microspheres with a specific surface area of ​​230m 2 / g~250m 2 / g, and the density is only 40-50 mg / cm 3 ; The wrinkled graphene oxide microspheres use their special wrinkled structure to act as a buffer when the product is subjected to external force, thereby improving the tensile strength.

[0142] The manufacturing method of wrinkled graphene oxide microspheres is the same as that in Example 1, so it will not be repeated here.

[0143] The spinning solvents are dichloromethane, 1,1-dichloro-2,2,2-trifluoroethane, monochlorodichloromethane, and 1H-perfluorohexane, and the mass ratio of the four is 6:2:1:1.

[0144] The mass fraction of the spinning raw material in the flash spinning solution is 11%.

[0145] (2) Manufacturing of flash-spun polyethylene film materials:

[0146] The flash spinning solution produced in step (1) is passed through a decompression chamber, a spinning assembly 1 is provided at the outlet of the decompression chamber, the flash spinning solution is flash-spun by the spinning assembly to obtain flash-spun fibers, and the flash-spun fibers 3 enter the laying system 4 through the spinning baffle 2 to obtain a grey cloth; the grey cloth is preliminarily pre-pressed by a pre-pressing upper roller 10 and a pre-pressing lower roller 11, and then enters the water tank 6, and then passes through a transmission roller 12, and the sizing rate is controlled by a left squeeze roller 13 and a right squeeze roller 14 to obtain a slurry-containing grey cloth; the slurry-containing grey cloth is sequentially passed through a preheating rolling upper roller 15, a preheating rolling lower roller 16, a hot rolling upper roller 17, a hot rolling lower roller 18, a pre-calendering upper roller 19, a pre-calendering lower roller 20, a calendering upper roller 21, a calendering lower roller 22, and finally passes through a winder 23 to obtain a flash-spun polyethylene film material;

[0147] The water tank contains a deionized water solution without surfactant. When the deionized water solution is pure deionized water, local penetration occurs during the subsequent hot pressing process. This is mainly because the deionized water is unevenly dispersed in the felt.

[0148] The sizing rate is 11%, where the sizing rate is calculated as: [(wet weight - dry weight) / dry weight] * 100%

[0149] The hot rolling temperature of the preheat rolling upper rod 15 and the preheat rolling lower rod 16 is 105°C;

[0150] The hot rolling temperature of the hot rolling upper rod 17 and the hot rolling lower rod 18 is 110°C;

[0151] The hot rolling temperature of the pre-calendered upper roller 19 and the pre-calendered lower roller 20 is 115°C;

[0152] The hot rolling temperature of the calendering upper roll 21 and the calendering lower roll 22 is 120°C.

[0153] The test results of this comparative example are shown in Table 1.

[0154] Comparative Example 2

[0155] This comparative example provides a method for manufacturing a flash-spun polyethylene film material, as shown in FIG1 , and the specific steps are as follows:

[0156] (1) Production of flash spinning solution:

[0157] The spinning raw materials and spinning solvent are added to the autoclave, and then the temperature is raised to 170°C. After the temperature is raised, nitrogen is introduced and the pressure is increased to 12.8 MPa. Finally, the temperature is raised to 215°C to obtain a flash spinning solution.

[0158] The spinning feedstock includes polyethylene and tough particles;

[0159] The mass fraction of tough particles in the spinning raw materials is 2%;

[0160] The tough particles are wrinkled graphene oxide microspheres with a specific surface area of ​​230m 2 / g~250m 2 / g, and the density is only 40-50 mg / cm 3 ; The wrinkled graphene oxide microspheres use their special wrinkled structure to act as a buffer when the product is subjected to external force, thereby improving the tensile strength.

[0161] The manufacturing method of wrinkled graphene oxide microspheres is the same as that in Example 1, so it will not be repeated here.

[0162] The spinning solvents are dichloromethane, 1,1-dichloro-2,2,2-trifluoroethane, monochlorodichloromethane, and 1H-perfluorohexane, and the mass ratio of the four is 6:2:1:1.

[0163] The mass fraction of the spinning raw material in the flash spinning solution is 11%.

[0164] (2) Manufacturing of flash-spun polyethylene film materials:

[0165] The flash spinning solution produced in step (1) is passed through a decompression chamber, a spinning assembly 1 is provided at the outlet of the decompression chamber, the flash spinning solution is flash-spun by the spinning assembly to obtain flash-spun fibers, and the flash-spun fibers 3 enter the laying system 4 through the spinning baffle 2 to obtain a grey cloth; the grey cloth is preliminarily pre-pressed by a pre-pressing upper roller 10 and a pre-pressing lower roller 11, and then enters the water tank 6, and then passes through a transmission roller 12, and the sizing rate is controlled by a left squeeze roller 13 and a right squeeze roller 14 to obtain a slurry-containing grey cloth; the slurry-containing grey cloth is sequentially passed through a preheating rolling upper roller 15, a preheating rolling lower roller 16, a hot rolling upper roller 17, a hot rolling lower roller 18, a pre-calendering upper roller 19, a pre-calendering lower roller 20, a calendering upper roller 21, a calendering lower roller 22, and finally passes through a winder 23 to obtain a flash-spun polyethylene film material;

[0166] The water tank contains a deionized water solution containing a surfactant. When the deionized water solution is pure deionized water, localized bright spots may occur during the subsequent hot pressing process. This is mainly due to the uneven dispersion of the deionized water in the felt. This application overcomes this dispersion problem by adding a surfactant, thereby reducing the occurrence of localized bright spots.

[0167] The mass fraction of the surfactant in the deionized water solution is 5%;

[0168] The surfactant is diacetylpiperazine quaternary ammonium salt Gemini surfactant;

[0169] The sizing rate is 11%, where the sizing rate is calculated as: [(wet weight - dry weight) / dry weight] * 100%

[0170] The hot rolling temperature of the preheat rolling upper rod 15 and the preheat rolling lower rod 16 is 105°C;

[0171] The hot rolling temperature of the hot rolling upper rod 17 and the hot rolling lower rod 18 is 110°C;

[0172] The hot rolling temperature of the pre-calendered upper roller 19 and the pre-calendered lower roller 20 is 115°C;

[0173] The hot rolling temperature of the calendering upper roll 21 and the calendering lower roll 22 is 120°C.

[0174] The test results of this comparative example are shown in Table 1.

[0175] Comparative Example 3

[0176] This comparative example provides a method for manufacturing a flash-spun polyethylene film material, as shown in FIG1 , and the specific steps are as follows:

[0177] (1) Production of flash spinning solution:

[0178] The spinning raw materials and spinning solvent are added to the autoclave, and then the temperature is raised to 170°C. After the temperature is raised, nitrogen is introduced and the pressure is increased to 12.8 MPa. Finally, the temperature is raised to 215°C to obtain a flash spinning solution.

[0179] The spinning feedstock includes polyethylene and tough particles;

[0180] The mass fraction of tough particles in the spinning raw materials is 2%;

[0181] The tough particles are wrinkled graphene oxide microspheres with a specific surface area of ​​230m 2 / g~250m 2 / g, and the density is only 40-50 mg / cm 3 ; The wrinkled graphene oxide microspheres use their special wrinkled structure to act as a buffer when the product is subjected to external force, thereby improving the tensile strength.

[0182] The manufacturing method of wrinkled graphene oxide microspheres is the same as that in Example 1, so it will not be repeated here.

[0183] The spinning solvents are dichloromethane, 1,1-dichloro-2,2,2-trifluoroethane, monochlorodichloromethane, and 1H-perfluorohexane, and the mass ratio of the four is 6:2:1:1.

[0184] The mass fraction of the spinning raw material in the flash spinning solution is 11%.

[0185] (2) Manufacturing of flash-spun polyethylene film materials:

[0186] The flash spinning solution produced in step (1) is passed through a decompression chamber, a spinning assembly 1 is provided at the outlet of the decompression chamber, the flash spinning solution is flash-spun by the spinning assembly to obtain flash-spun fibers, and the flash-spun fibers 3 enter the laying system 4 through the spinning baffle 2 to obtain a grey cloth; the grey cloth is preliminarily pre-pressed by a pre-pressing upper roller 10 and a pre-pressing lower roller 11, and then enters the water tank 6, and then passes through a transmission roller 12, and the sizing rate is controlled by a left squeeze roller 13 and a right squeeze roller 14 to obtain a slurry-containing grey cloth; the slurry-containing grey cloth is sequentially passed through a preheating rolling upper roller 15, a preheating rolling lower roller 16, a hot rolling upper roller 17, a hot rolling lower roller 18, a pre-calendering upper roller 19, a pre-calendering lower roller 20, a calendering upper roller 21, a calendering lower roller 22, and finally passes through a winder 23 to obtain a flash-spun polyethylene film material;

[0187] The water tank contains a deionized water solution containing a surfactant. When the deionized water solution is pure deionized water, localized bright spots may occur during the subsequent hot pressing process. This is mainly due to the uneven dispersion of the deionized water in the felt. This application overcomes this dispersion problem by adding a surfactant, thereby reducing the occurrence of localized bright spots.

[0188] The mass fraction of the surfactant in the deionized water solution is 10%;

[0189] The surfactant is diacetylpiperazine quaternary ammonium salt Gemini surfactant;

[0190] The sizing rate is 11%, where the sizing rate is calculated as: [(wet weight - dry weight) / dry weight] * 100%

[0191] The hot rolling temperature of the preheat rolling upper rod 15 and the preheat rolling lower rod 16 is 105°C;

[0192] The hot rolling temperature of the hot rolling upper rod 17 and the hot rolling lower rod 18 is 110°C;

[0193] The hot rolling temperature of the pre-calendered upper roller 19 and the pre-calendered lower roller 20 is 115°C;

[0194] The hot rolling temperature of the calendering upper roll 21 and the calendering lower roll 22 is 120°C.

[0195] The test results of this comparative example are shown in Table 1.

[0196] Comparative Example 4

[0197] This comparative example provides a method for manufacturing a flash-spun polyethylene film material, as shown in FIG1 , and the specific steps are as follows:

[0198] (1) Production of flash spinning solution:

[0199] The spinning raw materials and spinning solvent are added to the autoclave, and then the temperature is raised to 170°C. After the temperature is raised, nitrogen is introduced and the pressure is increased to 12.8 MPa. Finally, the temperature is raised to 215°C to obtain a flash spinning solution.

[0200] The spinning feedstock includes polyethylene and tough particles;

[0201] The mass fraction of tough particles in the spinning raw materials is 2%;

[0202] The tough particles are wrinkled graphene oxide microspheres with a specific surface area of ​​230m 2 / g~250m 2 / g, and the density is only 40-50 mg / cm 3 ; The wrinkled graphene oxide microspheres use their special wrinkled structure to act as a buffer when the product is subjected to external force, thereby improving the tensile strength.

[0203] The manufacturing method of wrinkled graphene oxide microspheres is the same as that in Example 1, so it will not be repeated here.

[0204] The spinning solvents are dichloromethane, 1,1-dichloro-2,2,2-trifluoroethane, monochlorodichloromethane, and 1H-perfluorohexane, and the mass ratio of the four is 6:2:1:1.

[0205] The mass fraction of the spinning raw material in the flash spinning solution is 11%.

[0206] (2) Manufacturing of flash-spun polyethylene film materials:

[0207] The flash spinning solution produced in step (1) is passed through a decompression chamber, a spinning assembly 1 is provided at the outlet of the decompression chamber, the flash spinning solution is flash-spun by the spinning assembly to obtain flash-spun fibers, and the flash-spun fibers 3 enter the laying system 4 through the spinning baffle 2 to obtain a grey cloth; the grey cloth is preliminarily pre-pressed by a pre-pressing upper roller 10 and a pre-pressing lower roller 11, and then enters the water tank 6, and then passes through a transmission roller 12, and the sizing rate is controlled by a left squeeze roller 13 and a right squeeze roller 14 to obtain a slurry-containing grey cloth; the slurry-containing grey cloth is sequentially passed through a preheating rolling upper roller 15, a preheating rolling lower roller 16, a hot rolling upper roller 17, a hot rolling lower roller 18, a pre-calendering upper roller 19, a pre-calendering lower roller 20, a calendering upper roller 21, a calendering lower roller 22, and finally passes through a winder 23 to obtain a flash-spun polyethylene film material;

[0208] The water tank contains a deionized water solution containing a surfactant. When the deionized water solution is pure deionized water, localized bright spots may occur during the subsequent hot pressing process. This is mainly due to the uneven dispersion of the deionized water in the felt. This application overcomes this dispersion problem by adding a surfactant, thereby reducing the occurrence of localized bright spots.

[0209] The mass fraction of the surfactant in the deionized water solution is 30%;

[0210] The surfactant is diacetylpiperazine quaternary ammonium salt Gemini surfactant;

[0211] The sizing rate is 11%, where the sizing rate is calculated as: [(wet weight - dry weight) / dry weight] * 100%

[0212] The hot rolling temperature of the preheat rolling upper rod 15 and the preheat rolling lower rod 16 is 105°C;

[0213] The hot rolling temperature of the hot rolling upper rod 17 and the hot rolling lower rod 18 is 110°C;

[0214] The hot rolling temperature of the pre-calendered upper roller 19 and the pre-calendered lower roller 20 is 115°C;

[0215] The hot rolling temperature of the calendering upper roll 21 and the calendering lower roll 22 is 120°C.

[0216] The test results of this comparative example are shown in Table 1.

[0217] Comparative Example 5

[0218] This comparative example provides a method for manufacturing a flash-spun polyethylene film material, as shown in FIG1 , and the specific steps are as follows:

[0219] (1) Production of flash spinning solution:

[0220] The spinning raw materials and spinning solvent are added to the autoclave, and then the temperature is raised to 170°C. After the temperature is raised, nitrogen is introduced and the pressure is increased to 12.8 MPa. Finally, the temperature is raised to 215°C to obtain a flash spinning solution.

[0221] The spinning feedstock includes polyethylene and tough particles;

[0222] The mass fraction of tough particles in the spinning raw materials is 2%;

[0223] The tough particles are wrinkled graphene oxide microspheres with a specific surface area of ​​230m 2 / g~250m 2 / g, and the density is only 40-50 mg / cm 3 ; The wrinkled graphene oxide microspheres use their special wrinkled structure to act as a buffer when the product is subjected to external force, thereby improving the tensile strength.

[0224] The manufacturing method of wrinkled graphene oxide microspheres is the same as that in Example 1, so it will not be repeated here.

[0225] The spinning solvents are dichloromethane, 1,1-dichloro-2,2,2-trifluoroethane, monochlorodichloromethane, and 1H-perfluorohexane, and the mass ratio of the four is 6:2:1:1.

[0226] The mass fraction of the spinning raw material in the flash spinning solution is 11%.

[0227] (2) Manufacturing of flash-spun polyethylene film materials:

[0228] The flash spinning solution produced in step (1) is passed through a decompression chamber, a spinning assembly 1 is provided at the outlet of the decompression chamber, the flash spinning solution is flash-spun by the spinning assembly to obtain flash-spun fibers, and the flash-spun fibers 3 enter the laying system 4 through the spinning baffle 2 to obtain a grey cloth; the grey cloth is preliminarily pre-pressed by a pre-pressing upper roller 10 and a pre-pressing lower roller 11, and then enters the water tank 6, and then passes through a transmission roller 12, and the sizing rate is controlled by a left squeeze roller 13 and a right squeeze roller 14 to obtain a slurry-containing grey cloth; the slurry-containing grey cloth is sequentially passed through a preheating rolling upper roller 15, a preheating rolling lower roller 16, a hot rolling upper roller 17, a hot rolling lower roller 18, a pre-calendering upper roller 19, a pre-calendering lower roller 20, a calendering upper roller 21, a calendering lower roller 22, and finally passes through a winder 23 to obtain a flash-spun polyethylene film material;

[0229] The water tank contains a deionized water solution containing a surfactant. When the deionized water solution is pure deionized water, localized bright spots may occur during the subsequent hot pressing process. This is mainly due to the uneven dispersion of the deionized water in the felt. This application overcomes this dispersion problem by adding a surfactant, thereby reducing the occurrence of localized bright spots.

[0230] The mass fraction of the surfactant in the deionized water solution is 35%;

[0231] The surfactant is diacetylpiperazine quaternary ammonium salt Gemini surfactant;

[0232] The sizing rate is 11%, where the sizing rate is calculated as: [(wet weight - dry weight) / dry weight] * 100%

[0233] The hot rolling temperature of the preheat rolling upper rod 15 and the preheat rolling lower rod 16 is 105°C;

[0234] The hot rolling temperature of the hot rolling upper rod 17 and the hot rolling lower rod 18 is 110°C;

[0235] The hot rolling temperature of the pre-calendered upper roller 19 and the pre-calendered lower roller 20 is 115°C;

[0236] The hot rolling temperature of the calendering upper roll 21 and the calendering lower roll 22 is 120°C.

[0237] The test results of this comparative example are shown in Table 1.

[0238] Comparative Example 6

[0239] This comparative example provides a method for manufacturing a flash-spun polyethylene film material, as shown in FIG1 , and the specific steps are as follows:

[0240] (1) Production of flash spinning solution:

[0241] The spinning raw materials and spinning solvent are added to the autoclave, and then the temperature is raised to 170°C. After the temperature is raised, nitrogen is introduced and the pressure is increased to 12.8 MPa. Finally, the temperature is raised to 215°C to obtain a flash spinning solution.

[0242] The spinning material is polyethylene;

[0243] The spinning solvents are dichloromethane, 1,1-dichloro-2,2,2-trifluoroethane, monochlorodichloromethane, and 1H-perfluorohexane, and the mass ratio of the four is 6:2:1:1.

[0244] The mass fraction of the spinning raw material in the flash spinning solution is 11%.

[0245] (2) Manufacturing of flash-spun polyethylene film materials:

[0246] The flash spinning solution produced in step (1) is passed through a decompression chamber, a spinning assembly 1 is provided at the outlet of the decompression chamber, the flash spinning solution is flash-spun by the spinning assembly to obtain flash-spun fibers, and the flash-spun fibers 3 enter the laying system 4 through the spinning baffle 2 to obtain a grey cloth; the grey cloth is preliminarily pre-pressed by a pre-pressing upper roller 10 and a pre-pressing lower roller 11, and then enters the water tank 6, and then passes through a transmission roller 12, and the sizing rate is controlled by a left squeeze roller 13 and a right squeeze roller 14 to obtain a slurry-containing grey cloth; the slurry-containing grey cloth is sequentially passed through a preheating rolling upper roller 15, a preheating rolling lower roller 16, a hot rolling upper roller 17, a hot rolling lower roller 18, a pre-calendering upper roller 19, a pre-calendering lower roller 20, a calendering upper roller 21, a calendering lower roller 22, and finally passes through a winder 23 to obtain a flash-spun polyethylene film material;

[0247] The water tank contains a deionized water solution containing a surfactant. When the deionized water solution is pure deionized water, localized bright spots may occur during the subsequent hot pressing process. This is mainly due to the uneven dispersion of the deionized water in the felt. This application overcomes this dispersion problem by adding a surfactant, thereby reducing the occurrence of localized bright spots.

[0248] The mass fraction of the surfactant in the deionized water solution is 20%;

[0249] The surfactant is diacetylpiperazine quaternary ammonium salt Gemini surfactant;

[0250] The sizing rate is 11%, where the sizing rate is calculated as: [(wet weight - dry weight) / dry weight] * 100%

[0251] The hot rolling temperature of the preheat rolling upper rod 15 and the preheat rolling lower rod 16 is 105°C;

[0252] The hot rolling temperature of the hot rolling upper rod 17 and the hot rolling lower rod 18 is 110°C;

[0253] The hot rolling temperature of the pre-calendered upper roller 19 and the pre-calendered lower roller 20 is 115°C;

[0254] The hot rolling temperature of the calendering upper roll 21 and the calendering lower roll 22 is 120°C.

[0255] The test results of this comparative example are shown in Table 1.

[0256] Comparative Example 7

[0257] This comparative example provides a method for manufacturing a flash-spun polyethylene film material, as shown in FIG1 , and the specific steps are as follows:

[0258] (1) Production of flash spinning solution:

[0259] The spinning raw materials and spinning solvent are added to the autoclave, and then the temperature is raised to 170°C. After the temperature is raised, nitrogen is introduced and the pressure is increased to 12.8 MPa. Finally, the temperature is raised to 215°C to obtain a flash spinning solution.

[0260] The spinning feedstock includes polyethylene and tough particles;

[0261] The mass fraction of tough particles in the spinning raw materials is 0.5%;

[0262] The tough particles are wrinkled graphene oxide microspheres with a specific surface area of ​​230m 2 / g~250m 2 / g, and the density is only 40-50 mg / cm 3 ; The wrinkled graphene oxide microspheres use their special wrinkled structure to act as a buffer when the product is subjected to external force, thereby improving the tensile strength.

[0263] The manufacturing method of wrinkled graphene oxide microspheres is the same as that in Example 1, so it will not be repeated here.

[0264] The spinning solvents are dichloromethane, 1,1-dichloro-2,2,2-trifluoroethane, monochlorodichloromethane, and 1H-perfluorohexane, and the mass ratio of the four is 6:2:1:1.

[0265] The mass fraction of the spinning raw material in the flash spinning solution is 11%.

[0266] (2) Manufacturing of flash-spun polyethylene film materials:

[0267] The flash spinning solution produced in step (1) is passed through a decompression chamber, a spinning assembly 1 is provided at the outlet of the decompression chamber, the flash spinning solution is flash-spun by the spinning assembly to obtain flash-spun fibers, and the flash-spun fibers 3 enter the laying system 4 through the spinning baffle 2 to obtain a grey cloth; the grey cloth is preliminarily pre-pressed by a pre-pressing upper roller 10 and a pre-pressing lower roller 11, and then enters the water tank 6, and then passes through a transmission roller 12, and the sizing rate is controlled by a left squeeze roller 13 and a right squeeze roller 14 to obtain a slurry-containing grey cloth; the slurry-containing grey cloth is sequentially passed through a preheating rolling upper roller 15, a preheating rolling lower roller 16, a hot rolling upper roller 17, a hot rolling lower roller 18, a pre-calendering upper roller 19, a pre-calendering lower roller 20, a calendering upper roller 21, a calendering lower roller 22, and finally passes through a winder 23 to obtain a flash-spun polyethylene film material;

[0268] The water tank contains a deionized water solution containing a surfactant. When the deionized water solution is pure deionized water, localized bright spots may occur during the subsequent hot pressing process. This is mainly due to the uneven dispersion of the deionized water in the felt. This application overcomes this dispersion problem by adding a surfactant, thereby reducing the occurrence of localized bright spots.

[0269] The mass fraction of the surfactant in the deionized water solution is 20%;

[0270] The surfactant is diacetylpiperazine quaternary ammonium salt Gemini surfactant;

[0271] The sizing rate is 11%, where the sizing rate is calculated as: [(wet weight - dry weight) / dry weight] * 100%

[0272] The hot rolling temperature of the preheat rolling upper rod 15 and the preheat rolling lower rod 16 is 105°C;

[0273] The hot rolling temperature of the hot rolling upper rod 17 and the hot rolling lower rod 18 is 110°C;

[0274] The hot rolling temperature of the pre-calendered upper roller 19 and the pre-calendered lower roller 20 is 115°C;

[0275] The hot rolling temperature of the calendering upper roll 21 and the calendering lower roll 22 is 120°C.

[0276] The test results of this comparative example are shown in Table 1.

[0277] Comparative Example 8

[0278] This comparative example provides a method for manufacturing a flash-spun polyethylene film material, as shown in FIG1 , and the specific steps are as follows:

[0279] (1) Production of flash spinning solution:

[0280] The spinning raw materials and spinning solvent are added to the autoclave, and then the temperature is raised to 170°C. After the temperature is raised, nitrogen is introduced and the pressure is increased to 12.8 MPa. Finally, the temperature is raised to 215°C to obtain a flash spinning solution.

[0281] The spinning feedstock includes polyethylene and tough particles;

[0282] The mass fraction of tough particles in the spinning raw materials is 1%;

[0283] The tough particles are wrinkled graphene oxide microspheres with a specific surface area of ​​230m 2 / g~250m 2 / g, and the density is only 40-50 mg / cm 3 ; The wrinkled graphene oxide microspheres use their special wrinkled structure to act as a buffer when the product is subjected to external force, thereby improving the tensile strength.

[0284] The manufacturing method of wrinkled graphene oxide microspheres is the same as that in Example 1, so it will not be repeated here.

[0285] The spinning solvents are dichloromethane, 1,1-dichloro-2,2,2-trifluoroethane, monochlorodichloromethane, and 1H-perfluorohexane, and the mass ratio of the four is 6:2:1:1.

[0286] The mass fraction of the spinning raw material in the flash spinning solution is 11%.

[0287] (2) Manufacturing of flash-spun polyethylene film materials:

[0288] The flash spinning solution produced in step (1) is passed through a decompression chamber, a spinning assembly 1 is provided at the outlet of the decompression chamber, the flash spinning solution is flash-spun by the spinning assembly to obtain flash-spun fibers, and the flash-spun fibers 3 enter the laying system 4 through the spinning baffle 2 to obtain a grey cloth; the grey cloth is preliminarily pre-pressed by a pre-pressing upper roller 10 and a pre-pressing lower roller 11, and then enters the water tank 6, and then passes through a transmission roller 12, and the sizing rate is controlled by a left squeeze roller 13 and a right squeeze roller 14 to obtain a slurry-containing grey cloth; the slurry-containing grey cloth is sequentially passed through a preheating rolling upper roller 15, a preheating rolling lower roller 16, a hot rolling upper roller 17, a hot rolling lower roller 18, a pre-calendering upper roller 19, a pre-calendering lower roller 20, a calendering upper roller 21, a calendering lower roller 22, and finally passes through a winder 23 to obtain a flash-spun polyethylene film material;

[0289] The water tank contains a deionized water solution containing a surfactant. When the deionized water solution is pure deionized water, localized bright spots may occur during the subsequent hot pressing process. This is mainly due to the uneven dispersion of the deionized water in the felt. This application overcomes this dispersion problem by adding a surfactant, thereby reducing the occurrence of localized bright spots.

[0290] The mass fraction of the surfactant in the deionized water solution is 20%;

[0291] The surfactant is diacetylpiperazine quaternary ammonium salt Gemini surfactant;

[0292] The sizing rate is 11%, where the sizing rate is calculated as: [(wet weight - dry weight) / dry weight] * 100%

[0293] The hot rolling temperature of the preheat rolling upper rod 15 and the preheat rolling lower rod 16 is 105°C;

[0294] The hot rolling temperature of the hot rolling upper rod 17 and the hot rolling lower rod 18 is 110°C;

[0295] The hot rolling temperature of the pre-calendered upper roller 19 and the pre-calendered lower roller 20 is 115°C;

[0296] The hot rolling temperature of the calendering upper roll 21 and the calendering lower roll 22 is 120°C.

[0297] The test results of this comparative example are shown in Table 1.

[0298] Comparative Example 9

[0299] This comparative example provides a method for manufacturing a flash-spun polyethylene film material, as shown in FIG1 , and the specific steps are as follows:

[0300] (1) Production of flash spinning solution:

[0301] The spinning raw materials and spinning solvent are added to the autoclave, and then the temperature is raised to 170°C. After the temperature is raised, nitrogen is introduced and the pressure is increased to 12.8 MPa. Finally, the temperature is raised to 215°C to obtain a flash spinning solution.

[0302] The spinning feedstock includes polyethylene and tough particles;

[0303] The mass fraction of tough particles in the spinning raw materials is 3%;

[0304] The tough particles are wrinkled graphene oxide microspheres with a specific surface area of ​​230m 2 / g~250m 2 / g, and the density is only 40-50 mg / cm 3 ; The wrinkled graphene oxide microspheres use their special wrinkled structure to act as a buffer when the product is subjected to external force, thereby improving the tensile strength.

[0305] The manufacturing method of wrinkled graphene oxide microspheres is the same as that in Example 1, so it will not be repeated here.

[0306] The spinning solvents are dichloromethane, 1,1-dichloro-2,2,2-trifluoroethane, monochlorodichloromethane, and 1H-perfluorohexane, and the mass ratio of the four is 6:2:1:1.

[0307] The mass fraction of the spinning raw material in the flash spinning solution is 11%.

[0308] (2) Manufacturing of flash-spun polyethylene film materials:

[0309] The flash spinning solution produced in step (1) is passed through a decompression chamber, a spinning assembly 1 is provided at the outlet of the decompression chamber, the flash spinning solution is flash-spun by the spinning assembly to obtain flash-spun fibers, and the flash-spun fibers 3 enter the laying system 4 through the spinning baffle 2 to obtain a grey cloth; the grey cloth is preliminarily pre-pressed by a pre-pressing upper roller 10 and a pre-pressing lower roller 11, and then enters the water tank 6, and then passes through a transmission roller 12, and the sizing rate is controlled by a left squeeze roller 13 and a right squeeze roller 14 to obtain a slurry-containing grey cloth; the slurry-containing grey cloth is sequentially passed through a preheating rolling upper roller 15, a preheating rolling lower roller 16, a hot rolling upper roller 17, a hot rolling lower roller 18, a pre-calendering upper roller 19, a pre-calendering lower roller 20, a calendering upper roller 21, a calendering lower roller 22, and finally passes through a winder 23 to obtain a flash-spun polyethylene film material;

[0310] The water tank contains a deionized water solution containing a surfactant. When the deionized water solution is pure deionized water, localized bright spots may occur during the subsequent hot pressing process. This is mainly due to the uneven dispersion of the deionized water in the felt. This application overcomes this dispersion problem by adding a surfactant, thereby reducing the occurrence of localized bright spots.

[0311] The mass fraction of the surfactant in the deionized water solution is 20%;

[0312] The surfactant is diacetylpiperazine quaternary ammonium salt Gemini surfactant;

[0313] The sizing rate is 11%, where the sizing rate is calculated as: [(wet weight - dry weight) / dry weight] * 100%

[0314] The hot rolling temperature of the preheat rolling upper rod 15 and the preheat rolling lower rod 16 is 105°C;

[0315] The hot rolling temperature of the hot rolling upper rod 17 and the hot rolling lower rod 18 is 110°C;

[0316] The hot rolling temperature of the pre-calendered upper roller 19 and the pre-calendered lower roller 20 is 115°C;

[0317] The hot rolling temperature of the calendering upper roll 21 and the calendering lower roll 22 is 120°C.

[0318] The test results of this comparative example are shown in Table 1.

[0319] Comparative Example 10

[0320] This comparative example provides a method for manufacturing a flash-spun polyethylene film material, as shown in FIG1 , and the specific steps are as follows:

[0321] (1) Production of flash spinning solution:

[0322] The spinning raw materials and spinning solvent are added to the autoclave, and then the temperature is raised to 170°C. After the temperature is raised, nitrogen is introduced and the pressure is increased to 12.8 MPa. Finally, the temperature is raised to 215°C to obtain a flash spinning solution.

[0323] The spinning feedstock includes polyethylene and tough particles;

[0324] The mass fraction of tough particles in the spinning raw materials is 3.5%;

[0325] The tough particles are wrinkled graphene oxide microspheres with a specific surface area of ​​230m 2 / g~250m 2 / g, and the density is only 40-50 mg / cm 3 ; The wrinkled graphene oxide microspheres use their special wrinkled structure to act as a buffer when the product is subjected to external force, thereby improving the tensile strength.

[0326] The manufacturing method of wrinkled graphene oxide microspheres is the same as that in Example 1, so it will not be repeated here.

[0327] The spinning solvents are dichloromethane, 1,1-dichloro-2,2,2-trifluoroethane, monochlorodichloromethane, and 1H-perfluorohexane, and the mass ratio of the four is 6:2:1:1.

[0328] The mass fraction of the spinning raw material in the flash spinning solution is 11%.

[0329] (2) Manufacturing of flash-spun polyethylene film materials:

[0330] The flash spinning solution produced in step (1) is passed through a decompression chamber, a spinning assembly 1 is provided at the outlet of the decompression chamber, the flash spinning solution is flash-spun by the spinning assembly to obtain flash-spun fibers, and the flash-spun fibers 3 enter the laying system 4 through the spinning baffle 2 to obtain a grey cloth; the grey cloth is preliminarily pre-pressed by a pre-pressing upper roller 10 and a pre-pressing lower roller 11, and then enters the water tank 6, and then passes through a transmission roller 12, and the sizing rate is controlled by a left squeeze roller 13 and a right squeeze roller 14 to obtain a slurry-containing grey cloth; the slurry-containing grey cloth is sequentially passed through a preheating rolling upper roller 15, a preheating rolling lower roller 16, a hot rolling upper roller 17, a hot rolling lower roller 18, a pre-calendering upper roller 19, a pre-calendering lower roller 20, a calendering upper roller 21, a calendering lower roller 22, and finally passes through a winder 23 to obtain a flash-spun polyethylene film material;

[0331] The water tank contains a deionized water solution containing a surfactant. When the deionized water solution is pure deionized water, localized bright spots may occur during the subsequent hot pressing process. This is mainly due to the uneven dispersion of the deionized water in the felt. This application overcomes this dispersion problem by adding a surfactant, thereby reducing the occurrence of localized bright spots.

[0332] The mass fraction of the surfactant in the deionized water solution is 20%;

[0333] The surfactant is diacetylpiperazine quaternary ammonium salt Gemini surfactant;

[0334] The sizing rate is 11%, where the sizing rate is calculated as: [(wet weight - dry weight) / dry weight] * 100%

[0335] The hot rolling temperature of the preheat rolling upper rod 15 and the preheat rolling lower rod 16 is 105°C;

[0336] The hot rolling temperature of the hot rolling upper rod 17 and the hot rolling lower rod 18 is 110°C;

[0337] The hot rolling temperature of the pre-calendered upper roller 19 and the pre-calendered lower roller 20 is 115°C;

[0338] The hot rolling temperature of the calendering upper roll 21 and the calendering lower roll 22 is 120°C.

[0339] The test results of this comparative example are shown in Table 1.

[0340] Table 1 Test data table

[0341] Results Analysis: Comparing the above data, it can be seen that increasing the amount of tough particles improves the product's initial toughness and reduces the product's toughness variation, but also results in a decrease in the product's transmittance. In contrast, increasing the amount of surfactant increases transmittance and initial toughness, reduces the product's toughness variation, and reduces the occurrence of localized bright spots. Therefore, by adjusting the amount of tough particles and surfactant, products with appropriate toughness and transmittance can be obtained, achieving the intended purpose of the present invention.

[0342] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope of the appended claims.

[0343] Although the present invention frequently uses terms such as spin pack 1, baffle 2, flash fiber 3, web laying machine 4, guide roller 5, water trough 6, pre-pressing upper roller 10, pre-pressing lower roller 11, transmission roller 12, left squeeze roller 13, right squeeze roller 14, pre-heating upper roller 15, pre-heating lower roller 16, hot rolling upper roller 17, hot rolling lower roller 18, pre-calendering upper roller 19, pre-calendering lower roller 20, calendering upper roller 21, calendering lower roller 22, and winder 23, the use of other terms is not excluded. These terms are used only to more conveniently describe and explain the essence of the present invention; interpreting them as any additional limitations is contrary to the spirit of the present invention.

Claims

1. A flash-spun polyethylene film material with better toughness, characterized in that: Its raw materials include polyethylene, The weight G of flash spun polyethylene film material is greater than 50g / m 2 ; The initial toughness Z0 of the flash-spun polyethylene membrane material is 20 to 35 (N·m) / g; Z0=[R M ×E M +R T ×E T ] / G; in: R M is the tensile strength in the MD direction; R T is the tensile strength in TD direction; E M is the tensile elongation in the MD direction; E T is the tensile elongation in TD direction; The flash-spun polyethylene film material was exposed to a dry heat atmosphere at 90°C for 6 hours, and then cooled for 24 hours at 25°C and a relative humidity of 65%; then the light transmittance thereof was measured to be 8% to 13%; The transmittance test is carried out according to GBT2410-2008. The transmittance is the ratio of the luminous flux passing through the sample to the luminous flux incident on the sample, expressed as a percentage.

2. A flash spun polyethylene film material with better toughness as claimed in claim 1, characterized in that: The initial toughness Z0 of the flash-spun polyethylene membrane material is 20-25 (N·m) / g.

3. A flash spun polyethylene film material with better toughness as claimed in claim 1, characterized in that: The initial toughness Z0 of the flash-spun polyethylene membrane material is 25 to 30 (N·m) / g.

4. A flash spun polyethylene film material with better toughness as claimed in claim 1, characterized in that: The initial toughness Z0 of the flash-spun polyethylene membrane material is 30-35 (N·m) / g.

5. A flash spun polyethylene film material with better toughness as claimed in claim 1, characterized in that: The light transmittance of the flash-spun polyethylene film material is 8% to 9%.

6. A flash spun polyethylene film material with better toughness as claimed in claim 1, characterized in that: The light transmittance of the flash-spun polyethylene film material is 9% to 10%.

7. A flash spun polyethylene film material with better toughness as claimed in claim 1, characterized in that: The light transmittance of the flash-spun polyethylene film material is 10% to 11%.

8. A flash spun polyethylene film material with better toughness as claimed in claim 1, characterized in that: The toughness change value of flash-spun polyethylene film material ●Z is 15% to 25%; Where: ●Z=[Z0-Z 10 ] / Z0*100% Z0 is the initial toughness, and the initial toughness is the Z0 of the sample = [R M ×E M +R T ×E T ] / G; Z 10 is the final toughness Z after high temperature treatment 10 , Z 10 =[R M10 ×E M10 +R T10 ×E T10 ] / G; The process flow of high temperature treatment is: (1) The samples were placed at 25°C and 65% relative humidity for 24 hours, and the tensile strength R in the MD direction of the samples was measured. M , tensile strength R in TD direction T , tensile elongation in MD direction E M , tensile elongation in TD direction E T ; Then calculate Z0 according to the formula; (2) then exposed to a dry heat atmosphere at 90°C for 6 hours, and then cooled for 24 hours at 25°C and 65% relative humidity; (3) Repeat step (2) for nine more treatments and measure the tensile strength R in the MD direction of the sample. M10 , tensile strength R in TD direction T10 , tensile elongation in MD direction E M10 , tensile elongation in TD direction E T10 ; Then calculate Z according to the formula 10 .

9. A flash spun polyethylene film material with better toughness as claimed in claim 8, characterized in that: The toughness change value ●Z of the flash-spun polyethylene film material is 15% to 20%.

10. A flash spun polyethylene film material with better toughness as claimed in claim 8, characterized in that: The toughness change value ●Z of the flash-spun polyethylene film material is 20% to 25%.

11. A method for producing a flash-spun polyethylene film material with better toughness, characterized in that: The specific steps are: (1) Production of flash spinning solution: Add spinning raw materials and spinning solvent into a high-pressure reactor, and then heat it to 160-180°C; after the heating is completed, introduce nitrogen and pressurize it to 12.5-13MPa; finally heat it to 200-230°C to obtain a flash spinning solution; The spinning feedstock includes polyethylene and tough particles; The tough particles are wrinkled graphene oxide microspheres; (2) Manufacturing of flash-spun polyethylene membrane materials: The flash spinning solution produced in step (1) is flash-spun through a spinning assembly (1) arranged in a decompression chamber to obtain flash-spun fibers (3); the flash-spun fibers (3) are laid and pre-pressed before entering a water tank (6); and then extruded, hot-rolled, calendered and wound to obtain a flash-spun polyethylene film material; The water tank (6) contains a deionized water solution containing a surfactant.

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