Flash-spun polyethylene film material with good toughness and method for preparing the same

Abstract

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Description

[Technical Field]

[0001] The present invention relates to the field of flash evaporation, and more particularly to a flash-spun polyethylene film material having good toughness and a method for preparing the same. [Background technology]

[0002] Research into the mechanical properties of film materials began in the 1980s, and leading countries in the field of film structures, such as Europe, the United States, and Japan, have already conducted extensive research. The Rain Blom Laboratory in Germany is the largest film materials mechanical properties research laboratory in Europe, and has established a unified testing method for determining strength indices such as tensile strength, tear strength, and peel strength of film materials, as well as process constants such as elastic modulus, Poisson's ratio, and shear modulus through biaxial tensile testing. This method has been adopted by industry organizations such as Tensinet. Japan also successively established unified testing standards for film material performance in 1993, 1995, and 2003. The scope of testing includes strength indices, process constant tests, and performance tests under long-term operating conditions such as creep, stress relaxation, folding resistance, high / low temperature resistance, waterproofing, and weather resistance.

[0003] In Shanghai, a film structure (skeletal film structure) was used in the Shanghai 80,000-seat Stadium in 1997, indicating that film structures have already been under development in China for nearly 10 years. Significant progress has been made in the design calculations and engineering applications of film structures. In terms of design calculations, many universities and other scientific research institutions have conducted in-depth theoretical research on aspects such as shape analysis, stress analysis, and cutting analysis of film structures, researched and developed related software, applied it extensively to engineering practices, and created film structure regulations based on domestic and international application experience to guide the design and construction of film structures. In terms of engineering applications, from small, initial film structures to large-scale film structures such as stadiums and exhibition halls, the structural forms already include tensile film structures, skeletal film structures, and inflation film structures.

[0004] In terms of film material applications, PVC film materials, PTFE film materials, and the latest PE film materials are all being used. Among these, PVC film materials are widely used in early and small film structures, PTFE film materials are mainly used in large, iconic film structures, and ETFE film materials have begun to be used domestically, with the Beijing Olympic Aquatics Center being the first to be used.

[0005] PVC film material is inexpensive, comes in many colors such as white, red, blue, and green, and has relatively wide applications. The film material is soft, has good tensile properties, is convenient for creating tension, and has good adaptability to errors during cutting. However, its durability and self-cleaning properties are relatively poor. As the material ages, its performance changes due to the external migration of the coating expander and the action of ultraviolet light. The surface gradually turns yellow and becomes sticky, and dust and dirt in the air adhere to the film surface, staining the surface and reducing light transmittance, thereby reducing its service life. To improve the durability and self-cleaning properties of such film material, a surface layer of polyvinyl fluoride (PVF) or polyvinylidene fluoride (PVDF) can be added outside the coating.

[0006] PTFE film materials have good durability and do not yellow or develop mold in the air. Furthermore, a fundamental characteristic of PTFE building film materials is their excellent self-cleaning properties; rainwater forms droplets on the surface and flows away. However, their price is relatively high, and the film material has relatively high rigidity. Rolling and folding during transportation and installation reduces the film's strength, resulting in relatively low ease of installation. Moreover, precise calculations are required during the design and cutting processes.

[0007] PE film materials are formed by bidirectional stretching and are divided into wet and dry processes. DuPont first discovered PE film materials formed by flash evaporation in 1960, and has since popularized and applied this technology, maintaining its monopoly to this day. Our company began research and development of flash evaporation in 2014, established a pilot production line in 2020, and implemented large-scale mass production in 2022. Our research revealed that conventional flash evaporation film materials suffer from technical problems such as insufficient toughness and poor light transmittance. Therefore, this invention aims to overcome the limitations of conventional technology and expand its application range by increasing the amount of functional particles and improving the spinning process.

[0008] U.S. Patent Publication No. US20200274122A1 relates to a partition plate medium for an electrochemical battery comprising at least one nonwoven polymer fiber sheet.

[0009] The nonwoven fabric sheet has a surface area of ​​approximately 0.5 to 1.5 m² / g, with a maximum pore diameter that is 2.5 times or more the average flow pore diameter and greater than 11 times the minimum pore diameter. This sheet can be sulfonated to about 0.67%, and after sulfonation, it exhibits superior tensile properties compared to conventionally known partition plates.

[0010] U.S. Patent US20190160782A1 relates to a non-fiber-oriented polyethylene monolayer comprising ultra-high molecular weight polyethylene having a viscosity-average molecular weight of 2,000,000 or more, wherein (i) the monolayer has a width of 10.0 mm or more and an elastic modulus of at least 100 N / tex, (ii) when measured in dynamic mechanical analysis (DMA) of the tensile response at a frequency scan between 0.1 Hz ≤ f ≤ 1.0 Hz, the monolayer has tanδ and satisfies the inequality tanδ < 1 / (f × a), and (iii) the monolayer has a maximum area weight of 45 gsm or less.

[0011] European Patent EP3736126A1 relates to a packaging for providing a sterilizable sealed internal environment and a breathable fibrous nonwoven sheet structure used in such a structure, where the nonwoven sheet structure has at least one surface, the surface has a pre-sealed embossed pattern, and the particle barrier transmittance is less than 10%, the Gurley Hill porosity is 40 seconds or less, and the moisture permeability is 3500 g / m 2 / day or more.

[0012] The invention according to US Patent US8048513 relates to an improved plexifilament sheet used for protective clothing and filtration media. The material consists of substantially continuous polyethylene plexifilament sheet fiber bundles and has a Frazier transmittance of at least 2 cfm / ft standardized to 1.0 ounce / yard. 2 with.

[0013] However, in the above prior art, no research has been conducted on how to adjust and change the toughness and light transmittance of the flash evaporation film material.

Summary of the Invention

Problems to be Solved by the Invention

[0014] An object of the present invention is to provide a flash-spun polyethylene film material having good toughness for the above problems.

[0015] Another object of the present invention is to provide a method for preparing a flash-spun polyethylene film material having good toughness for the above problems.

Means for Solving the Problems

[0016] To achieve the above object, the present invention adopts the following technical solutions: A flash-spun polyethylene film material having good toughness, the raw material thereof contains polyethylene, The basis weight G of the flash-spun polyethylene film material is 50 g / m2 Larger than, The initial toughness Z0 of the flash-spun polyethylene film material is 20-35 (N·m) / g. The flash-spun polyethylene film material was exposed to a dry heat atmosphere at 90°C for 6 hours, then cooled for 24 hours under conditions of 25°C and 65% relative humidity, after which its light transmittance was measured to be 8%~13%. Based on GBT2410-2008, a test was performed to determine the light transmittance. Light transmittance is the ratio of the light beam transmitted through the sample to the light beam incident on the sample, and is expressed as a percentage.

[0017] Tensile strength is measured according to the national standard GB / T12914-2018. Tensile strength is the maximum tension that a sample can withstand per unit width before breaking under specified test conditions, and is specifically divided into tensile strength and elongation in the longitudinal (MD) direction of the sample, and tensile strength and elongation in the transverse (TD) direction of the sample.

[0018] The initial toughness Z0 of the flash-spun polyethylene film material is 20-25 (N·m) / g.

[0019] The initial toughness Z0 of the flash-spun polyethylene film material is 25-30 (N·m) / g.

[0020] The initial toughness Z0 of the flash-spun polyethylene film material is 30-35 (N·m) / g.

[0021] The light transmittance of flash-spun polyethylene film material is 8% to 9%.

[0022] The light transmittance of flash-spun polyethylene film material is 9% to 10%.

[0023] The light transmittance of flash-spun polyethylene film material is 10% to 11%.

[0024] The toughness change value ●Z of the flash-spun polyethylene film material is 15% - 25%, and it is a flash-spun polyethylene film material with good toughness characterized by this.

[0025] The process flow of the high-temperature treatment is as follows: (1) After the sample is left standing for 24 hours under the conditions of 25°C and a relative humidity of 65%, the tensile strength R in the MD direction of the sample M , the tensile strength R in the TD direction T , the tensile elongation rate E in the MD direction M , the tensile elongation rate E in the TD direction T are respectively measured, and Z0 is calculated based on the formula. JPEG2026510465000004.jpg41170

[0026] The toughness change value ●Z of the flash-spun polyethylene film material is 15% - 20%.

[0027] The toughness change value ●Z of the flash-spun polyethylene film material is 20% - 25%.

[0028] The basis weight G of the flash-spun polyethylene film material is greater than 60 g / m 2 .

[0029] The basis weight G of the flash-spun polyethylene film material is less than 120 g / m 2 .

[0030] The basis weight G of the flash-spun polyethylene film material is less than 100 g / m 2 .

[0031] The basis weight G of the flash-spun polyethylene film material is less than 80 g / m 2 .

[0032] A method for preparing a flash-spun polyethylene film material with good toughness, and its specific steps are as follows: (1) Preparation of flash evaporation spinning solution: After adding the spinning raw materials and spinning solvent to the high-pressure reaction vessel, the temperature is raised to 160-180°C, and after the temperature rise is complete, nitrogen is introduced and the pressure is increased to 12.5-13 MPa, and finally the temperature is raised to 200-230°C to obtain the flash-evaporated spinning solution. The spinning raw materials include polyethylene and tough particles. The mass fraction of tough particles in the spinning raw material is 1.5% to 2.5%. The tough particles are wrinkled graphene oxide microspheres, with a specific surface area of ​​230 m². 2 / g~250m 2 The density is 40-50 mg / cm³ / g. 3 Furthermore, wrinkled graphene oxide microspheres, utilizing their special wrinkled structure, improve tensile strength by providing a buffering effect when the product is subjected to external forces.

[0033] Spinning solvents include aromatic hydrocarbons, unsaturated hydrocarbons, halogenated hydrocarbons, alcohols, esters, ethers, ketones, and carbon fluoride compounds. The spinning solvents are dichloromethane, 1,1-dichloro-2,2,2-trifluoroethane, monochlorodichloromethane, and 1H-perfluorohexane, with a mass ratio of 6:2:1:1.

[0034] The mass fraction of the spinning raw material in the flash evaporation solution is 7% to 17%.

[0035] (2) Preparation of flash-spun polyethylene film material: The flash evaporative spinning solution prepared in step (1) is passed through a vacuum chamber, a spinning assembly is placed at the outlet of the vacuum chamber, the flash evaporative spinning solution is flash evaporative spun through the spinning assembly to obtain flash spun fibers, the flash spun fibers are placed in a wrapping system via a spinning baffle to obtain fabric, the fabric is placed in a water tank with initial pre-pressure via a pre-pressure upper rod and a pre-pressure lower rod, passed through a transmission rod, the sizing rate is controlled by a left extruder and a right extruder to obtain sizing-impregnated fabric, the sizing-impregnated fabric is passed sequentially through a pre-hot rolling upper rod, a pre-hot rolling lower rod, a hot rolling upper rod, a hot rolling lower rod, a pre-calender upper rod, a pre-calender lower rod, a calender upper rod, a calender lower rod, and finally the flash spun polyethylene film material is obtained via a winding machine. The water in the tank is a deionized aqueous solution containing a surfactant. This is because if the deionized aqueous solution is pure deionized water, a local permeability phenomenon occurs during the subsequent hot pressing process, mainly resulting in the non-uniform dispersion of deionized water within the blanket.

[0036] This invention reduces the occurrence of localized bright spot phenomena by overcoming the dispersion problem through the addition of a surfactant. The purpose of adding the water bath treatment process is to allow water vapor in the sizing-impregnated fabric to penetrate the fibers during hot rolling, improving heat transfer efficiency, uniformizing bonding, uniform product distribution, and improving tensile strength.

[0037] The mass fraction of surfactant in a deionized aqueous solution is 15% to 25%. The surfactant is a bisacetylpiperazine quaternary ammonium salt Gemini surfactant. The sizing rate is 8% to 14%, and the calculation for the sizing rate is: [(wet weight - dry weight) / dry weight] * 100%. The hot rolling temperatures for the pre-heat-rolled upper and lower bars were 104-106°C. The hot rolling temperatures for the hot-rolled upper bar and the hot-rolled lower bar are 109-111°C. The hot rolling temperatures for the upper and lower precalender bars were 114-116°C. The hot rolling temperatures for the upper and lower calender bars are 119-121°C. [Effects of the Invention]

[0038] Compared to conventional technology, the positive effects of the present invention are as follows: 1. The present invention has found that by adding a certain amount of tough particles to the spinning raw material, it is possible to significantly affect the toughness of the final product and also have a certain effect on the light transmittance.

[0039] 2. The present invention utilizes the fact that, after treating the fabric with a deionized aqueous solution of a surfactant, the heat transfer efficiency of water vapor is high, and water vapor easily passes through the fibers during hot rolling and calendering. By making the bonding uniform and the product distribution uniform, the toughness and light transmittance are affected. [Brief explanation of the drawing]

[0040] [Figure 1] This is a schematic diagram of the structure of the present invention. [Modes for carrying out the invention]

[0041] The present invention will be described in more detail below with reference to the drawings and specific embodiments of the specification.

[0042] Example 1 This embodiment provides a method for preparing a flash-spun polyethylene film material having good toughness, and as shown in Figure 1, the specific steps are as follows: (1) Preparation of flash evaporation spinning solution: After adding the spinning raw materials and spinning solvent to the high-pressure reaction vessel, the temperature is raised to 160°C. Once the temperature rise is complete, nitrogen is introduced, the pressure is increased to 12.5 MPa, and finally the temperature is raised to 200°C to obtain the flash-evaporated spinning solution. The spinning raw materials include polyethylene and tough particles. The mass fraction of tough particles in the spinning raw material is 1.5%. The tough particles are wrinkled graphene oxide microspheres, with a specific surface area of ​​230 m². 2 / g~250m 2 The density is 40-50 mg / cm³ / g. 3 Furthermore, wrinkled graphene oxide microspheres, utilizing their special wrinkled structure, improve tensile strength by providing a buffering effect when the product is subjected to external forces.

[0043] Here, wrinkled graphene oxide microspheres are prepared by the following method: graphite powder is added to sulfuric acid and mixed uniformly, then potassium ironate and hydrogen peroxide solution are added sequentially to perform intercalation oxidation, and after separation, it is washed with water and dried to obtain graphene oxide, and the graphene oxide is rapidly heated in a nitrogen atmosphere and roasted at high temperature to obtain wrinkled graphene oxide microspheres.

[0044] The spinning solvents are dichloromethane, 1,1-dichloro-2,2,2-trifluoroethane, monochlorodichloromethane, and 1H-perfluorohexane, with a mass ratio of 6:2:1:1.

[0045] The mass fraction of the spinning raw material in the flash evaporation solution is 8%.

[0046] (2) Preparation of flash-spun polyethylene film material: The flash evaporative spinning solution prepared in step (1) is passed through a vacuum chamber, the spinning assembly 1 is placed at the outlet of the vacuum chamber, the flash evaporative spinning solution is flash evaporative spun through the spinning assembly to obtain flash spun fibers, the flash spun fibers 3 are placed in the wrapping system 4 via the spinning baffle 2 to obtain the fabric, the fabric is placed in the water tank 6 via the initial pre-pressure of the pre-pressure upper rod 10 and pre-pressure lower rod 11, passed through the transmission rod 12, the sizing rate is controlled by the left extrusion rod 13 and right extrusion roller 14 to obtain the sizing impregnated fabric, the sizing impregnated fabric is passed sequentially through the pre-hot rolling upper rod 15, pre-hot rolling lower rod 16, hot rolling upper rod 17, hot rolling lower rod 18, pre-calender upper rod 19, pre-calender lower rod 20, calender upper rod 21, calender lower rod 22, and finally the flash spun polyethylene film material is obtained via the winding machine 23. The water in the tank is a deionized aqueous solution containing a surfactant. When the deionized aqueous solution is pure deionized water, a local spot phenomenon occurs during the subsequent hot pressing process, mainly due to the uneven dispersion of deionized water in the blanket. This invention overcomes this dispersion problem by adding a surfactant, thereby reducing the occurrence of the local spot phenomenon.

[0047] The mass fraction of surfactant in the deionized aqueous solution is 15%. The surfactant is a bisacetylpiperazine quaternary ammonium salt Gemini surfactant. The sizing rate is 9%, and the calculation for the sizing rate is: [(wet weight - dry weight) / dry weight] * 100%. The hot rolling temperatures of the pre-hot-rolled upper bar 15 and the pre-hot-rolled lower bar 16 were 104°C. The hot-rolling temperatures of the hot-rolled upper bar 17 and the hot-rolled lower bar 18 were 109°C. The hot rolling temperature of the precalender upper bar 19 and precalender lower bar 20 was 114°C. The hot rolling temperatures of the upper calender bar 21 and the lower calender bar 22 are 119°C.

[0048] The test results for this embodiment are shown in Table 1.

[0049] Example 2 This embodiment provides a method for preparing a flash-spun polyethylene film material having good toughness, and as shown in Figure 1, the specific steps are as follows: (1) Preparation of flash evaporation spinning solution: After adding the spinning raw materials and spinning solvent to the high-pressure reaction vessel, the temperature is raised to 170°C. Once the temperature rise is complete, nitrogen is introduced, the pressure is increased to 12.8 MPa, and finally the temperature is raised to 215°C to obtain the flash-evaporated spinning solution. The spinning raw materials include polyethylene and tough particles. The mass fraction of tough particles in the spinning raw material is 2%. The tough particles are wrinkled graphene oxide microspheres, with a specific surface area of ​​230 m². 2 / g~250m 2 The density is 40-50 mg / cm³ / g. 3 Furthermore, wrinkled graphene oxide microspheres, utilizing their special wrinkled structure, improve tensile strength by providing a buffering effect when the product is subjected to external forces.

[0050] The preparation method for wrinkled graphene oxide microspheres is the same as in Example 1, so no further explanation will be given.

[0051] The spinning solvents are dichloromethane, 1,1-dichloro-2,2,2-trifluoroethane, monochlorodichloromethane, and 1H-perfluorohexane, with a mass ratio of 6:2:1:1.

[0052] The mass fraction of the spinning raw material in the flash evaporation solution is 11%.

[0053] (2) Preparation of flash-spun polyethylene film material: The flash evaporative spinning solution prepared in step (1) is passed through a vacuum chamber, the spinning assembly 1 is placed at the outlet of the vacuum chamber, the flash evaporative spinning solution is flash evaporative spun through the spinning assembly to obtain flash spun fibers, the flash spun fibers 3 are placed in the wrapping system 4 via the spinning baffle 2 to obtain the fabric, the fabric is placed in the water tank 6 via the initial pre-pressure of the pre-pressure upper rod 10 and pre-pressure lower rod 11, passed through the transmission rod 12, the sizing rate is controlled by the left extrusion rod 13 and right extrusion roller 14 to obtain the sizing impregnated fabric, the sizing impregnated fabric is passed sequentially through the pre-hot rolling upper rod 15, pre-hot rolling lower rod 16, hot rolling upper rod 17, hot rolling lower rod 18, pre-calender upper rod 19, pre-calender lower rod 20, calender upper rod 21, calender lower rod 22, and finally the flash spun polyethylene film material is obtained via the winding machine 23. The water in the tank is a deionized aqueous solution containing a surfactant. When the deionized aqueous solution is pure deionized water, a local spot phenomenon occurs during the subsequent hot pressing process, mainly due to the uneven dispersion of deionized water in the blanket. This invention overcomes this dispersion problem by adding a surfactant, thereby reducing the occurrence of the local spot phenomenon.

[0054] The mass fraction of surfactant in the deionized aqueous solution is 20%. The surfactant is a bisacetylpiperazine quaternary ammonium salt Gemini surfactant. The sizing rate is 11%, and the calculation for the sizing rate is: [(wet weight - dry weight) / dry weight] * 100%. The hot rolling temperatures of the pre-hot-rolled upper bar 15 and the pre-hot-rolled lower bar 16 were 105°C. The hot-rolling temperatures of the hot-rolled upper bar 17 and the hot-rolled lower bar 18 are 110°C. The hot rolling temperature of the precalender upper bar 19 and precalender lower bar 20 was 115°C. The hot rolling temperature of the upper calender bar 21 and the lower calender bar 22 is 120°C.

[0055] The test results for this embodiment are shown in Table 1.

[0056] Example 3 This embodiment provides a method for preparing a flash-spun polyethylene film material having good toughness, and as shown in Figure 1, the specific steps are as follows: (1) Preparation of flash evaporation spinning solution: After adding the spinning raw materials and spinning solvent to the high-pressure reaction vessel, the temperature is raised to 180°C. Once the temperature rise is complete, nitrogen is introduced, the pressure is increased to 13 MPa, and finally the temperature is raised to 230°C to obtain the flash-evaporated spinning solution. The spinning raw materials include polyethylene and tough particles. The mass fraction of tough particles in the spinning raw material is 2.5%. The tough particles are wrinkled graphene oxide microspheres, with a specific surface area of ​​230 m². 2 / g~250m 2 The density is 40-50 mg / cm³ / g. 3 Furthermore, wrinkled graphene oxide microspheres, utilizing their special wrinkled structure, improve tensile strength by providing a buffering effect when the product is subjected to external forces.

[0057] The preparation method for wrinkled graphene oxide microspheres is the same as in Example 1, so no further explanation will be given.

[0058] The spinning solvents are dichloromethane, 1,1-dichloro-2,2,2-trifluoroethane, monochlorodichloromethane, and 1H-perfluorohexane, with a mass ratio of 6:2:1:1.

[0059] The mass fraction of the spinning raw material in the flash evaporation solution is 15%.

[0060] (2) Preparation of flash-spun polyethylene film material: The flash evaporative spinning solution prepared in step (1) is passed through a vacuum chamber, the spinning assembly 1 is placed at the outlet of the vacuum chamber, the flash evaporative spinning solution is flash evaporative spun through the spinning assembly to obtain flash spun fibers, the flash spun fibers 3 are placed in the wrapping system 4 via the spinning baffle 2 to obtain the fabric, the fabric is placed in the water tank 6 via the initial pre-pressure of the pre-pressure upper rod 10 and pre-pressure lower rod 11, passed through the transmission rod 12, the sizing rate is controlled by the left extrusion rod 13 and right extrusion roller 14 to obtain the sizing impregnated fabric, the sizing impregnated fabric is passed sequentially through the pre-hot rolling upper rod 15, pre-hot rolling lower rod 16, hot rolling upper rod 17, hot rolling lower rod 18, pre-calender upper rod 19, pre-calender lower rod 20, calender upper rod 21, calender lower rod 22, and finally the flash spun polyethylene film material is obtained via the winding machine 23. The water in the tank is a deionized aqueous solution containing a surfactant. When the deionized aqueous solution is pure deionized water, a local spot phenomenon occurs during the subsequent hot pressing process, mainly due to the uneven dispersion of deionized water in the blanket. This invention overcomes this dispersion problem by adding a surfactant, thereby reducing the occurrence of the local spot phenomenon.

[0061] The mass fraction of surfactant in the deionized aqueous solution is 24%. The surfactant is a bisacetylpiperazine quaternary ammonium salt Gemini surfactant. The sizing rate is 13%, and the calculation for the sizing rate is: [(wet weight - dry weight) / dry weight] * 100%. The hot rolling temperatures of the pre-hot-rolled upper bar 15 and the pre-hot-rolled lower bar 16 were 106°C. The hot rolling temperatures of the hot-rolled upper bar 17 and the hot-rolled lower bar 18 were 111°C. The hot rolling temperature of the precalender upper bar 19 and precalender lower bar 20 was 116°C. The hot rolling temperature of the upper calender bar 21 and the lower calender bar 22 is 121°C.

[0062] The test results for this embodiment are shown in Table 1.

[0063] Comparative Example 1 This comparative example provides a method for preparing a flash-spun polyethylene film material, and as shown in Figure 1, the specific steps are as follows: (1) Preparation of flash evaporation spinning solution: After adding the spinning raw materials and spinning solvent to the high-pressure reaction vessel, the temperature is raised to 170°C. Once the temperature rise is complete, nitrogen is introduced, the pressure is increased to 12.8 MPa, and finally the temperature is raised to 215°C to obtain the flash-evaporated spinning solution. The spinning raw materials include polyethylene and tough particles. The mass fraction of tough particles in the spinning raw material is 2%. The tough particles are wrinkled graphene oxide microspheres, with a specific surface area of ​​230 m². 2 / g~250m 2 The density is 40-50 mg / cm³ / g. 3 Furthermore, wrinkled graphene oxide microspheres, utilizing their special wrinkled structure, improve tensile strength by providing a buffering effect when the product is subjected to external forces.

[0064] The preparation method for wrinkled graphene oxide microspheres is the same as in Example 1, so no further explanation will be given.

[0065] The spinning solvents are dichloromethane, 1,1-dichloro-2,2,2-trifluoroethane, monochlorodichloromethane, and 1H-perfluorohexane, with a mass ratio of 6:2:1:1.

[0066] The mass fraction of the spinning raw material in the flash evaporation solution is 11%.

[0067] (2) Preparation of flash-spun polyethylene film material: The flash evaporative spinning solution prepared in step (1) is passed through a vacuum chamber, the spinning assembly 1 is placed at the outlet of the vacuum chamber, and the flash evaporative spinning solution is flash evaporative spun through the spinning assembly to obtain flash spun fibers. Flash-spun fibers 3 are fed into the wrapping system 4 via the spinning baffle 2 to obtain the fabric, the fabric is placed in the water tank 6 via initial pre-pressure using the pre-pressing upper rod 10 and pre-pressing lower rod 11, passed through the transmission rod 12, the sizing rate is controlled by the left extrusion rod 13 and right extrusion roller 14 to obtain the sizing-impregnated fabric, the sizing-impregnated fabric is passed sequentially through the pre-hot rolling upper rod 15, pre-hot rolling lower rod 16, hot rolling upper rod 17, hot rolling lower rod 18, pre-calender upper rod 19, pre-calender lower rod 20, calender upper rod 21, calender lower rod 22, and finally the flash-spun polyethylene film material is obtained via the winding machine 23. The water in the tank is a deionized aqueous solution that does not contain surfactants. This is because if the deionized aqueous solution is pure deionized water, a local permeability phenomenon occurs during the subsequent hot pressing process, mainly resulting in the non-uniform dispersion of deionized water within the blanket.

[0068] The sizing rate is 11%, and the calculation for the sizing rate is: [(wet weight - dry weight) / dry weight] * 100%. The hot rolling temperatures of the pre-hot-rolled upper bar 15 and the pre-hot-rolled lower bar 16 were 105°C. The hot-rolling temperatures of the hot-rolled upper bar 17 and the hot-rolled lower bar 18 are 110°C. The hot rolling temperature of the precalender upper bar 19 and precalender lower bar 20 was 115°C. The hot rolling temperature of the upper calender bar 21 and the lower calender bar 22 is 120°C.

[0069] The test results for this comparative example are shown in Table 1.

[0070] Comparative Example 2 This comparative example provides a method for preparing a flash-spun polyethylene film material, and as shown in Figure 1, the specific steps are as follows: (1) Preparation of flash evaporation spinning solution: After adding the spinning raw materials and spinning solvent to the high-pressure reaction vessel, the temperature is raised to 170°C. Once the temperature rise is complete, nitrogen is introduced, the pressure is increased to 12.8 MPa, and finally the temperature is raised to 215°C to obtain the flash-evaporated spinning solution. The spinning raw materials include polyethylene and tough particles. The mass fraction of tough particles in the spinning raw material is 2%. The tough particles are wrinkled graphene oxide microspheres, with a specific surface area of ​​230 m². 2 / g~250m 2 The density is 40-50 mg / cm³ / g. 3 Furthermore, wrinkled graphene oxide microspheres, utilizing their special wrinkled structure, improve tensile strength by providing a buffering effect when the product is subjected to external forces.

[0071] The preparation method for wrinkled graphene oxide microspheres is the same as in Example 1, so no further explanation will be given.

[0072] The spinning solvents are dichloromethane, 1,1-dichloro-2,2,2-trifluoroethane, monochlorodichloromethane, and 1H-perfluorohexane, with a mass ratio of 6:2:1:1.

[0073] The mass fraction of the spinning raw material in the flash evaporation solution is 11%.

[0074] (2) Preparation of flash-spun polyethylene film material: The flash evaporative spinning solution prepared in step (1) is passed through a vacuum chamber, the spinning assembly 1 is placed at the outlet of the vacuum chamber, the flash evaporative spinning solution is flash evaporative spun through the spinning assembly to obtain flash spun fibers, the flash spun fibers 3 are placed in the wrapping system 4 via the spinning baffle 2 to obtain the fabric, the fabric is placed in the water tank 6 via the initial pre-pressure of the pre-pressure upper rod 10 and pre-pressure lower rod 11, passed through the transmission rod 12, the sizing rate is controlled by the left extrusion rod 13 and right extrusion roller 14 to obtain the sizing impregnated fabric, the sizing impregnated fabric is passed sequentially through the pre-hot rolling upper rod 15, pre-hot rolling lower rod 16, hot rolling upper rod 17, hot rolling lower rod 18, pre-calender upper rod 19, pre-calender lower rod 20, calender upper rod 21, calender lower rod 22, and finally the flash spun polyethylene film material is obtained via the winding machine 23. The water in the tank is a deionized aqueous solution containing a surfactant. When the deionized aqueous solution is pure deionized water, a local spot phenomenon occurs during the subsequent hot pressing process, mainly due to the uneven dispersion of deionized water in the blanket. This invention overcomes this dispersion problem by adding a surfactant, thereby reducing the occurrence of the local spot phenomenon.

[0075] The mass fraction of surfactant in the deionized aqueous solution is 5%. The surfactant is a bisacetylpiperazine quaternary ammonium salt Gemini surfactant. The sizing rate is 11%, and the calculation for the sizing rate is: [(wet weight - dry weight) / dry weight] * 100%. The hot rolling temperatures of the pre-hot-rolled upper bar 15 and the pre-hot-rolled lower bar 16 were 105°C. The hot-rolling temperatures of the hot-rolled upper bar 17 and the hot-rolled lower bar 18 are 110°C. The hot rolling temperature of the precalender upper bar 19 and precalender lower bar 20 was 115°C. The hot rolling temperature of the upper calender bar 21 and the lower calender bar 22 is 120°C.

[0076] The test results for this comparative example are shown in Table 1.

[0077] Comparative Example 3 This comparative example provides a method for preparing a flash-spun polyethylene film material, and as shown in Figure 1, the specific steps are as follows: (1) Preparation of flash evaporation spinning solution: After adding the spinning raw materials and spinning solvent to the high-pressure reaction vessel, the temperature is raised to 170°C. Once the temperature rise is complete, nitrogen is introduced, the pressure is increased to 12.8 MPa, and finally the temperature is raised to 215°C to obtain the flash-evaporated spinning solution. The spinning raw materials include polyethylene and tough particles. The mass fraction of tough particles in the spinning raw material is 2%. The tough particles are wrinkled graphene oxide microspheres, with a specific surface area of ​​230 m². 2 / g~250m 2The density is 40-50 mg / cm³ / g. 3 Furthermore, wrinkled graphene oxide microspheres, utilizing their special wrinkled structure, improve tensile strength by providing a buffering effect when the product is subjected to external forces.

[0078] The preparation method for wrinkled graphene oxide microspheres is the same as in Example 1, so no further explanation will be given.

[0079] The spinning solvents are dichloromethane, 1,1-dichloro-2,2,2-trifluoroethane, monochlorodichloromethane, and 1H-perfluorohexane, with a mass ratio of 6:2:1:1.

[0080] The mass fraction of the spinning raw material in the flash evaporation solution is 11%.

[0081] (2) Preparation of flash-spun polyethylene film material: The flash evaporative spinning solution prepared in step (1) is passed through a vacuum chamber, the spinning assembly 1 is placed at the outlet of the vacuum chamber, the flash evaporative spinning solution is flash evaporative spun through the spinning assembly to obtain flash spun fibers, the flash spun fibers 3 are placed in the wrapping system 4 via the spinning baffle 2 to obtain the fabric, the fabric is placed in the water tank 6 via the initial pre-pressure of the pre-pressure upper rod 10 and pre-pressure lower rod 11, passed through the transmission rod 12, the sizing rate is controlled by the left extrusion rod 13 and right extrusion roller 14 to obtain the sizing impregnated fabric, the sizing impregnated fabric is passed sequentially through the pre-hot rolling upper rod 15, pre-hot rolling lower rod 16, hot rolling upper rod 17, hot rolling lower rod 18, pre-calender upper rod 19, pre-calender lower rod 20, calender upper rod 21, calender lower rod 22, and finally the flash spun polyethylene film material is obtained via the winding machine 23. The water in the tank is a deionized aqueous solution containing a surfactant. When the deionized aqueous solution is pure deionized water, a local spot phenomenon occurs during the subsequent hot pressing process, mainly due to the uneven dispersion of deionized water in the blanket. This invention overcomes this dispersion problem by adding a surfactant, thereby reducing the occurrence of the local spot phenomenon.

[0082] The mass fraction of surfactant in the deionized aqueous solution is 10%. The surfactant is a bisacetylpiperazine quaternary ammonium salt Gemini surfactant. The sizing rate is 11%, and the calculation for the sizing rate is: [(wet weight - dry weight) / dry weight] * 100%. The hot rolling temperatures of the pre-hot-rolled upper bar 15 and the pre-hot-rolled lower bar 16 were 105°C. The hot-rolling temperatures of the hot-rolled upper bar 17 and the hot-rolled lower bar 18 are 110°C. The hot rolling temperature of the precalender upper bar 19 and precalender lower bar 20 was 115°C. The hot rolling temperature of the upper calender bar 21 and the lower calender bar 22 is 120°C.

[0083] The test results for this comparative example are shown in Table 1.

[0084] Comparative Example 4 This comparative example provides a method for preparing a flash-spun polyethylene film material, and as shown in Figure 1, the specific steps are as follows: (1) Preparation of flash evaporation spinning solution: After adding the spinning raw materials and spinning solvent to the high-pressure reaction vessel, the temperature is raised to 170°C. Once the temperature rise is complete, nitrogen is introduced, the pressure is increased to 12.8 MPa, and finally the temperature is raised to 215°C to obtain the flash-evaporated spinning solution. The spinning raw materials include polyethylene and tough particles. The mass fraction of tough particles in the spinning raw material is 2%. The tough particles are wrinkled graphene oxide microspheres, with a specific surface area of ​​230 m². 2 / g~250m2 The density is 40-50 mg / cm³ / g. 3 Furthermore, wrinkled graphene oxide microspheres, utilizing their special wrinkled structure, improve tensile strength by providing a buffering effect when the product is subjected to external forces.

[0085] The preparation method for wrinkled graphene oxide microspheres is the same as in Example 1, so no further explanation will be given.

[0086] The spinning solvents are dichloromethane, 1,1-dichloro-2,2,2-trifluoroethane, monochlorodichloromethane, and 1H-perfluorohexane, with a mass ratio of 6:2:1:1.

[0087] The mass fraction of the spinning raw material in the flash evaporation solution is 11%.

[0088] (2) Preparation of flash-spun polyethylene film material: The flash evaporative spinning solution prepared in step (1) is passed through a vacuum chamber, the spinning assembly 1 is placed at the outlet of the vacuum chamber, the flash evaporative spinning solution is flash evaporative spun through the spinning assembly to obtain flash spun fibers, the flash spun fibers 3 are placed in the wrapping system 4 via the spinning baffle 2 to obtain the fabric, the fabric is placed in the water tank 6 via the initial pre-pressure of the pre-pressure upper rod 10 and pre-pressure lower rod 11, passed through the transmission rod 12, the sizing rate is controlled by the left extrusion rod 13 and right extrusion roller 14 to obtain the sizing impregnated fabric, the sizing impregnated fabric is passed sequentially through the pre-hot rolling upper rod 15, pre-hot rolling lower rod 16, hot rolling upper rod 17, hot rolling lower rod 18, pre-calender upper rod 19, pre-calender lower rod 20, calender upper rod 21, calender lower rod 22, and finally the flash spun polyethylene film material is obtained via the winding machine 23. The water in the tank is a deionized aqueous solution containing a surfactant. When the deionized aqueous solution is pure deionized water, a local spot phenomenon occurs during the subsequent hot pressing process, mainly due to the uneven dispersion of deionized water in the blanket. This invention overcomes this dispersion problem by adding a surfactant, thereby reducing the occurrence of the local spot phenomenon.

[0089] The mass fraction of surfactant in the deionized aqueous solution is 30%. The surfactant is a bisacetylpiperazine quaternary ammonium salt Gemini surfactant. The sizing rate is 11%, and the calculation for the sizing rate is: [(wet weight - dry weight) / dry weight] * 100%. The hot rolling temperatures of the pre-hot-rolled upper bar 15 and the pre-hot-rolled lower bar 16 were 105°C. The hot-rolling temperatures of the hot-rolled upper bar 17 and the hot-rolled lower bar 18 are 110°C. The hot rolling temperature of the precalender upper bar 19 and precalender lower bar 20 was 115°C. The hot rolling temperature of the upper calender bar 21 and the lower calender bar 22 is 120°C.

[0090] The test results for this comparative example are shown in Table 1.

[0091] Comparative Example 5 This comparative example provides a method for preparing a flash-spun polyethylene film material, and as shown in Figure 1, the specific steps are as follows: (1) Preparation of flash evaporation spinning solution: After adding the spinning raw materials and spinning solvent to the high-pressure reaction vessel, the temperature is raised to 170°C. Once the temperature rise is complete, nitrogen is introduced, the pressure is increased to 12.8 MPa, and finally the temperature is raised to 215°C to obtain the flash-evaporated spinning solution. The spinning raw materials include polyethylene and tough particles. The mass fraction of tough particles in the spinning raw material is 2%. The tough particles are wrinkled graphene oxide microspheres, with a specific surface area of ​​230 m². 2 / g~250m2 The density is 40-50 mg / cm³ / g. 3 Furthermore, wrinkled graphene oxide microspheres, utilizing their special wrinkled structure, improve tensile strength by providing a buffering effect when the product is subjected to external forces.

[0092] The preparation method for wrinkled graphene oxide microspheres is the same as in Example 1, so no further explanation will be given.

[0093] The spinning solvents are dichloromethane, 1,1-dichloro-2,2,2-trifluoroethane, monochlorodichloromethane, and 1H-perfluorohexane, with a mass ratio of 6:2:1:1.

[0094] The mass fraction of the spinning raw material in the flash evaporation solution is 11%.

[0095] (2) Preparation of flash-spun polyethylene film material: The flash evaporative spinning solution prepared in step (1) is passed through a vacuum chamber, the spinning assembly 1 is placed at the outlet of the vacuum chamber, the flash evaporative spinning solution is flash evaporative spun through the spinning assembly to obtain flash spun fibers, the flash spun fibers 3 are placed in the wrapping system 4 via the spinning baffle 2 to obtain the fabric, the fabric is placed in the water tank 6 via the initial pre-pressure of the pre-pressure upper rod 10 and pre-pressure lower rod 11, passed through the transmission rod 12, the sizing rate is controlled by the left extrusion rod 13 and right extrusion roller 14 to obtain the sizing impregnated fabric, the sizing impregnated fabric is passed sequentially through the pre-hot rolling upper rod 15, pre-hot rolling lower rod 16, hot rolling upper rod 17, hot rolling lower rod 18, pre-calender upper rod 19, pre-calender lower rod 20, calender upper rod 21, calender lower rod 22, and finally the flash spun polyethylene film material is obtained via the winding machine 23. The water in the tank is a deionized aqueous solution containing a surfactant. When the deionized aqueous solution is pure deionized water, a local spot phenomenon occurs during the subsequent hot pressing process, mainly due to the uneven dispersion of deionized water in the blanket. This invention overcomes this dispersion problem by adding a surfactant, thereby reducing the occurrence of the local spot phenomenon.

[0096] The mass fraction of surfactant in the deionized aqueous solution is 35%. The surfactant is a bisacetylpiperazine quaternary ammonium salt Gemini surfactant. The sizing rate is 11%, and the calculation for the sizing rate is: [(wet weight - dry weight) / dry weight] * 100%. The hot rolling temperatures of the pre-hot-rolled upper bar 15 and the pre-hot-rolled lower bar 16 were 105°C. The hot-rolling temperatures of the hot-rolled upper bar 17 and the hot-rolled lower bar 18 are 110°C. The hot rolling temperature of the precalender upper bar 19 and precalender lower bar 20 was 115°C. The hot rolling temperature of the upper calender bar 21 and the lower calender bar 22 is 120°C.

[0097] The test results for this comparative example are shown in Table 1.

[0098] Comparative Example 6 This comparative example provides a method for preparing a flash-spun polyethylene film material, and as shown in Figure 1, the specific steps are as follows: (1) Preparation of flash evaporation spinning solution: After adding the spinning raw materials and spinning solvent to the high-pressure reaction vessel, the temperature is raised to 170°C. Once the temperature rise is complete, nitrogen is introduced, the pressure is increased to 12.8 MPa, and finally the temperature is raised to 215°C to obtain the flash-evaporated spinning solution. The raw material for spinning is polyethylene. The spinning solvents are dichloromethane, 1,1-dichloro-2,2,2-trifluoroethane, monochlorodichloromethane, and 1H-perfluorohexane, with a mass ratio of 6:2:1:1.

[0099] The mass fraction of the spinning raw material in the flash evaporation solution is 11%.

[0100] (2) Preparation of flash-spun polyethylene film material: The flash evaporative spinning solution prepared in step (1) is passed through a vacuum chamber, the spinning assembly 1 is placed at the outlet of the vacuum chamber, the flash evaporative spinning solution is flash evaporative spun through the spinning assembly to obtain flash spun fibers, the flash spun fibers 3 are placed in the wrapping system 4 via the spinning baffle 2 to obtain the fabric, the fabric is placed in the water tank 6 via the initial pre-pressure of the pre-pressure upper rod 10 and pre-pressure lower rod 11, passed through the transmission rod 12, the sizing rate is controlled by the left extrusion rod 13 and right extrusion roller 14 to obtain the sizing impregnated fabric, the sizing impregnated fabric is passed sequentially through the pre-hot rolling upper rod 15, pre-hot rolling lower rod 16, hot rolling upper rod 17, hot rolling lower rod 18, pre-calender upper rod 19, pre-calender lower rod 20, calender upper rod 21, calender lower rod 22, and finally the flash spun polyethylene film material is obtained via the winding machine 23. The water in the tank is a deionized aqueous solution containing a surfactant.

[0101] This is because, when the deionized aqueous solution is pure deionized water, a local spot phenomenon occurs during the subsequent hot pressing process, mainly due to the uneven dispersion of deionized water within the blanket. This invention overcomes this dispersion problem by adding a surfactant, thereby reducing the occurrence of the local spot phenomenon.

[0102] The mass fraction of surfactant in the deionized aqueous solution is 20%. The surfactant is a bisacetylpiperazine quaternary ammonium salt Gemini surfactant. The sizing rate is 11%, and the calculation for the sizing rate is: [(wet weight - dry weight) / dry weight] * 100%. The hot rolling temperatures of the pre-hot-rolled upper bar 15 and the pre-hot-rolled lower bar 16 were 105°C. The hot-rolling temperatures of the hot-rolled upper bar 17 and the hot-rolled lower bar 18 are 110°C. The hot rolling temperature of the precalender upper bar 19 and precalender lower bar 20 was 115°C. The hot rolling temperature of the upper calender bar 21 and the lower calender bar 22 is 120°C.

[0103] The test results for this comparative example are shown in Table 1.

[0104] Comparative Example 7 This comparative example provides a method for preparing a flash-spun polyethylene film material, and as shown in Figure 1, the specific steps are as follows: (1) Preparation of flash evaporation spinning solution: After adding the spinning raw materials and spinning solvent to the high-pressure reaction vessel, the temperature is raised to 170°C. Once the temperature rise is complete, nitrogen is introduced, the pressure is increased to 12.8 MPa, and finally the temperature is raised to 215°C to obtain the flash-evaporated spinning solution. The spinning raw materials include polyethylene and tough particles. The mass fraction of tough particles in the spinning raw material is 0.5%. The tough particles are wrinkled graphene oxide microspheres, with a specific surface area of ​​230 m². 2 / g~250m 2 The density is 40-50 mg / cm³ / g. 3 Furthermore, wrinkled graphene oxide microspheres, utilizing their special wrinkled structure, improve tensile strength by providing a buffering effect when the product is subjected to external forces.

[0105] The preparation method for wrinkled graphene oxide microspheres is the same as in Example 1, so no further explanation will be given.

[0106] The spinning solvents are dichloromethane, 1,1-dichloro-2,2,2-trifluoroethane, monochlorodichloromethane, and 1H-perfluorohexane, with a mass ratio of 6:2:1:1.

[0107] The mass fraction of the spinning raw material in the flash evaporation solution is 11%.

[0108] (2) Preparation of flash-spun polyethylene film material: The flash evaporative spinning solution prepared in step (1) is passed through a vacuum chamber, the spinning assembly 1 is placed at the outlet of the vacuum chamber, the flash evaporative spinning solution is flash evaporative spun through the spinning assembly to obtain flash spun fibers, the flash spun fibers 3 are placed in the wrapping system 4 via the spinning baffle 2 to obtain the fabric, the fabric is placed in the water tank 6 via the initial pre-pressure of the pre-pressure upper rod 10 and pre-pressure lower rod 11, passed through the transmission rod 12, the sizing rate is controlled by the left extrusion rod 13 and right extrusion roller 14 to obtain the sizing impregnated fabric, the sizing impregnated fabric is passed sequentially through the pre-hot rolling upper rod 15, pre-hot rolling lower rod 16, hot rolling upper rod 17, hot rolling lower rod 18, pre-calender upper rod 19, pre-calender lower rod 20, calender upper rod 21, calender lower rod 22, and finally the flash spun polyethylene film material is obtained via the winding machine 23. The water in the tank is a deionized aqueous solution containing a surfactant. When the deionized aqueous solution is pure deionized water, a local spot phenomenon occurs during the subsequent hot pressing process, mainly due to the uneven dispersion of deionized water in the blanket. This invention overcomes this dispersion problem by adding a surfactant, thereby reducing the occurrence of the local spot phenomenon.

[0109] The mass fraction of surfactant in the deionized aqueous solution is 20%. The surfactant is a bisacetylpiperazine quaternary ammonium salt Gemini surfactant. The sizing rate is 11%, and the calculation for the sizing rate is: [(wet weight - dry weight) / dry weight] * 100%. The hot rolling temperatures of the pre-hot-rolled upper bar 15 and the pre-hot-rolled lower bar 16 were 105°C. The hot-rolling temperatures of the hot-rolled upper bar 17 and the hot-rolled lower bar 18 are 110°C. The hot rolling temperature of the precalender upper bar 19 and precalender lower bar 20 was 115°C. The hot rolling temperature of the upper calender bar 21 and the lower calender bar 22 is 120°C.

[0110] The test results for this comparative example are shown in Table 1.

[0111] Comparative Example 8 This comparative example provides a method for preparing a flash-spun polyethylene film material, and as shown in Figure 1, the specific steps are as follows: (1) Preparation of flash evaporation spinning solution: After adding the spinning raw materials and spinning solvent to the high-pressure reaction vessel, the temperature is raised to 170°C. Once the temperature rise is complete, nitrogen is introduced, the pressure is increased to 12.8 MPa, and finally the temperature is raised to 215°C to obtain the flash-evaporated spinning solution. The spinning raw materials include polyethylene and tough particles. The mass fraction of tough particles in the spinning raw material is 1%. The tough particles are wrinkled graphene oxide microspheres, with a specific surface area of ​​230 m². 2 / g~250m 2 The density is 40-50 mg / cm³ / g. 3 Furthermore, wrinkled graphene oxide microspheres, utilizing their special wrinkled structure, improve tensile strength by providing a buffering effect when the product is subjected to external forces.

[0112] The preparation method for wrinkled graphene oxide microspheres is the same as in Example 1, so no further explanation will be given.

[0113] The spinning solvents are dichloromethane, 1,1-dichloro-2,2,2-trifluoroethane, monochlorodichloromethane, and 1H-perfluorohexane, with a mass ratio of 6:2:1:1.

[0114] The mass fraction of the spinning raw material in the flash evaporation solution is 11%.

[0115] (2) Preparation of flash-spun polyethylene film material: The flash evaporation spinning solution prepared in step (1) is passed through a vacuum chamber, the spinning assembly 1 is placed at the outlet of the vacuum chamber, the flash evaporation spinning solution is flash evaporated spinned through the spinning assembly to obtain flash-spun fibers, the flash-spun fibers 3 are placed in the wrapping system 4 via the spinning baffle 2 to obtain the fabric, and the fabric is placed in the water tank 6 via the initial pre-pressure of the pre-pressing upper rod 10 and pre-pressing lower rod 11. The material is passed through the transmission rod 12, the sizing rate is controlled by the left extrusion rod 13 and the right extrusion roller 14 to obtain a sizing-impregnated fabric, and the sizing-impregnated fabric is passed sequentially through the pre-hot rolling upper rod 15, pre-hot rolling lower rod 16, hot rolling upper rod 17, hot rolling lower rod 18, pre-calender upper rod 19, pre-calender lower rod 20, calender upper rod 21, calender lower rod 22, and finally the flash-spun polyethylene film material is obtained via the winding machine 23. The water in the tank is a deionized aqueous solution containing a surfactant. When the deionized aqueous solution is pure deionized water, a local spot phenomenon occurs during the subsequent hot pressing process, mainly due to the uneven dispersion of deionized water in the blanket. This invention overcomes this dispersion problem by adding a surfactant, thereby reducing the occurrence of the local spot phenomenon.

[0116] The mass fraction of surfactant in the deionized aqueous solution is 20%. The surfactant is a bisacetylpiperazine quaternary ammonium salt Gemini surfactant. The sizing rate is 11%, and the calculation for the sizing rate is: [(wet weight - dry weight) / dry weight] * 100%. The hot rolling temperatures of the pre-hot-rolled upper bar 15 and the pre-hot-rolled lower bar 16 were 105°C. The hot-rolling temperatures of the hot-rolled upper bar 17 and the hot-rolled lower bar 18 are 110°C. The hot rolling temperature of the precalender upper bar 19 and precalender lower bar 20 was 115°C. The hot rolling temperature of the upper calender bar 21 and the lower calender bar 22 is 120°C.

[0117] The test results for this comparative example are shown in Table 1.

[0118] Comparative Example 9 This comparative example provides a method for preparing a flash-spun polyethylene film material, and as shown in Figure 1, the specific steps are as follows: (1) Preparation of flash evaporation spinning solution: After adding the spinning raw materials and spinning solvent to the high-pressure reaction vessel, the temperature is raised to 170°C. Once the temperature rise is complete, nitrogen is introduced, the pressure is increased to 12.8 MPa, and finally the temperature is raised to 215°C to obtain the flash-evaporated spinning solution. The spinning raw materials include polyethylene and tough particles. The mass fraction of tough particles in the spinning raw material is 3%. The tough particles are wrinkled graphene oxide microspheres, with a specific surface area of ​​230 m². 2 / g~250m 2 The density is 40-50 mg / cm³ / g. 3 Furthermore, wrinkled graphene oxide microspheres, utilizing their special wrinkled structure, improve tensile strength by providing a buffering effect when the product is subjected to external forces.

[0119] The preparation method for wrinkled graphene oxide microspheres is the same as in Example 1, so no further explanation will be given.

[0120] The spinning solvents are dichloromethane, 1,1-dichloro-2,2,2-trifluoroethane, monochlorodichloromethane, and 1H-perfluorohexane, with a mass ratio of 6:2:1:1.

[0121] The mass fraction of the spinning raw material in the flash evaporation solution is 11%.

[0122] (2) Preparation of flash-spun polyethylene film material: The flash evaporative spinning solution prepared in step (1) is passed through a vacuum chamber, the spinning assembly 1 is placed at the outlet of the vacuum chamber, the flash evaporative spinning solution is flash evaporative spun through the spinning assembly to obtain flash spun fibers, the flash spun fibers 3 are placed in the wrapping system 4 via the spinning baffle 2 to obtain the fabric, the fabric is placed in the water tank 6 via the initial pre-pressure of the pre-pressure upper rod 10 and pre-pressure lower rod 11, passed through the transmission rod 12, the sizing rate is controlled by the left extrusion rod 13 and right extrusion roller 14 to obtain the sizing impregnated fabric, the sizing impregnated fabric is passed sequentially through the pre-hot rolling upper rod 15, pre-hot rolling lower rod 16, hot rolling upper rod 17, hot rolling lower rod 18, pre-calender upper rod 19, pre-calender lower rod 20, calender upper rod 21, calender lower rod 22, and finally the flash spun polyethylene film material is obtained via the winding machine 23. The water in the tank is a deionized aqueous solution containing a surfactant. When the deionized aqueous solution is pure deionized water, a local spot phenomenon occurs during the subsequent hot pressing process, mainly due to the uneven dispersion of deionized water in the blanket. This invention overcomes this dispersion problem by adding a surfactant, thereby reducing the occurrence of the local spot phenomenon.

[0123] The mass fraction of surfactant in the deionized aqueous solution is 20%. The surfactant is a bisacetylpiperazine quaternary ammonium salt Gemini surfactant. The sizing rate is 11%, and the calculation for the sizing rate is: [(wet weight - dry weight) / dry weight] * 100%. The hot rolling temperatures of the pre-hot-rolled upper bar 15 and the pre-hot-rolled lower bar 16 were 105°C. The hot-rolling temperatures of the hot-rolled upper bar 17 and the hot-rolled lower bar 18 are 110°C. The hot rolling temperature of the precalender upper bar 19 and precalender lower bar 20 was 115°C. The hot rolling temperature of the upper calender bar 21 and the lower calender bar 22 is 120°C.

[0124] The test results for this comparative example are shown in Table 1.

[0125] Comparative Example 10 This comparative example provides a method for preparing a flash-spun polyethylene film material, and as shown in Figure 1, the specific steps are as follows: (1) Preparation of flash evaporation spinning solution: After adding the spinning raw materials and spinning solvent to the high-pressure reaction vessel, the temperature is raised to 170°C. Once the temperature rise is complete, nitrogen is introduced, the pressure is increased to 12.8 MPa, and finally the temperature is raised to 215°C to obtain the flash-evaporated spinning solution. The spinning raw materials include polyethylene and tough particles. The mass fraction of tough particles in the spinning raw material is 3.5%. The tough particles are wrinkled graphene oxide microspheres, with a specific surface area of ​​230 m². 2 / g~250m 2 The density is 40-50 mg / cm³ / g. 3 Furthermore, wrinkled graphene oxide microspheres, utilizing their special wrinkled structure, improve tensile strength by providing a buffering effect when the product is subjected to external forces.

[0126] The preparation method for wrinkled graphene oxide microspheres is the same as in Example 1, so no further explanation will be given.

[0127] The spinning solvents are dichloromethane, 1,1-dichloro-2,2,2-trifluoroethane, monochlorodichloromethane, and 1H-perfluorohexane, with a mass ratio of 6:2:1:1.

[0128] The mass fraction of the spinning raw material in the flash evaporation solution is 11%.

[0129] (2) Preparation of flash-spun polyethylene film material: The flash evaporative spinning solution prepared in step (1) is passed through a vacuum chamber, the spinning assembly 1 is placed at the outlet of the vacuum chamber, the flash evaporative spinning solution is flash evaporative spun through the spinning assembly to obtain flash spun fibers, the flash spun fibers 3 are placed in the wrapping system 4 via the spinning baffle 2 to obtain the fabric, the fabric is placed in the water tank 6 via the initial pre-pressure of the pre-pressure upper rod 10 and pre-pressure lower rod 11, passed through the transmission rod 12, the sizing rate is controlled by the left extrusion rod 13 and right extrusion roller 14 to obtain the sizing impregnated fabric, the sizing impregnated fabric is passed sequentially through the pre-hot rolling upper rod 15, pre-hot rolling lower rod 16, hot rolling upper rod 17, hot rolling lower rod 18, pre-calender upper rod 19, pre-calender lower rod 20, calender upper rod 21, calender lower rod 22, and finally the flash spun polyethylene film material is obtained via the winding machine 23. The water in the tank is a deionized aqueous solution containing a surfactant. When the deionized aqueous solution is pure deionized water, a local spot phenomenon occurs during the subsequent hot pressing process, mainly due to the uneven dispersion of deionized water in the blanket. This invention overcomes this dispersion problem by adding a surfactant, thereby reducing the occurrence of the local spot phenomenon.

[0130] The mass fraction of surfactant in the deionized aqueous solution is 20%. The surfactant is a bisacetylpiperazine quaternary ammonium salt Gemini surfactant. The sizing rate is 11%, and the calculation for the sizing rate is: [(wet weight - dry weight) / dry weight] * 100%. The hot rolling temperatures of the pre-hot-rolled upper bar 15 and the pre-hot-rolled lower bar 16 were 105°C. The hot-rolling temperatures of the hot-rolled upper bar 17 and the hot-rolled lower bar 18 are 110°C. The hot rolling temperature of the precalender upper bar 19 and precalender lower bar 20 was 115°C. The hot rolling temperature of the upper calender bar 21 and the lower calender bar 22 is 120°C.

[0131] The test results for this comparative example are shown in Table 1. JPEG2026510465000005.jpg102170

[0132] Results Analysis: Comparing the above data, it can be seen that increasing the amount of tough particles used improves the initial toughness of the product and reduces the change in toughness, but it can lead to a decrease in the product's transmittance. The amount of surfactant used can increase light transmittance and initial toughness, reduce the change in toughness, and decrease the occurrence of localized bright spots. Therefore, by controlling the amount of tough particles and surfactant used, it is possible to obtain a product with appropriate toughness and light transmittance characteristics, thereby achieving the desired objective of the present invention.

[0133] The specific examples described herein are merely illustrative of the spirit of the invention.

[0134] Those skilled in the art can make various modifications or additions to the specific embodiments described, or substitute them in similar ways, without departing from the spirit of the invention or exceeding the scope defined in the appended claims.

[0135] This specification frequently uses terms such as spinning assembly 1, baffle 2, flash-evaporated fiber 3, cross-wrapping 4, guide roller 5, water tank 6, pre-loaded upper rod 10, pre-loaded lower rod 11, transmission rod 12, left extrusion rod 13, right extrusion roller 14, pre-heat-rolling upper rod 15, pre-heat-rolling lower rod 16, hot-rolling upper rod 17, hot-rolling lower rod 18, pre-calender upper rod 19, pre-calender lower rod 20, calender upper rod 21, calender lower rod 22, and winder 23, but the possibility of using other terms is not ruled out. These terms are used solely to more conveniently describe the essence of the invention. To interpret them as any additional limitations would be contrary to the spirit of the invention. [Explanation of symbols]

[0136] 1. Spinning assembly 2 baffles 3 Flash Evaporation Fibers 4 Cross Trumpet 5 Guide rollers 6 Aquariums 10 Pre-pressure upper rod 11 Pre-pressure rod 12 transmission rods 13 Left-hand extrusion rod 14 Right-hand extrusion roller 15 Preheated Rolled Upper Bar 16 Preheated Rolled Bar 17 Hot-rolled upper bar 18 Hot-rolled lower bar 19 Pre-calendar upper bar 20 Pre-calendar lower bar 21 Calendar Top Bar 22 Calendar bottom bar 23 Winder

Claims

1. A flash-spun polyethylene film material having good toughness, the raw material of which includes polyethylene, The basis weight G of the flash-spun polyethylene film material is greater than 50 g / m2. Initial toughness Z of flash-spun polyethylene film material 0 The ratio is 20-35 (N·m) / g, The flash-spun polyethylene film material was exposed to a dry heat atmosphere at 90°C for 6 hours, then cooled for 24 hours under conditions of 25°C and 65% relative humidity, after which its light transmittance was measured to be between 8% and 13%. A flash-spun polyethylene film material having good toughness, characterized in that the light transmittance test is performed according to GBT2410-2008, and the light transmittance is the ratio of the light beam transmitted through the sample to the light beam incident on the sample, and is expressed as a percentage.

2. Initial toughness Z of flash-spun polyethylene film material ０ The flash-spun polyethylene film material having good toughness according to claim 1, characterized in that the ratio is 20 to 25 (N·m) / g.

3. Initial toughness Z of flash-spun polyethylene film material 0 The flash-spun polyethylene film material having good toughness according to claim 1, characterized in that the ratio is 25 to 30 (N·m) / g.

4. Initial toughness Z of flash-spun polyethylene film material 0 The flash-spun polyethylene film material having good toughness, characterized in that the ratio is 30 to 35 (N・m) / g, as described in claim 1.

5. The flash-spun polyethylene film material having good toughness is characterized in that the light transmittance of the flash-spun polyethylene film material is 8% to 9%.

6. The flash-spun polyethylene film material having good toughness is characterized in that the light transmittance of the flash-spun polyethylene film material is 9% to 10%.

7. The flash-spun polyethylene film material having good toughness is characterized in that the light transmittance of the flash-spun polyethylene film material is 10% to 11%.

8. The toughness change value ●Z for flash-spun polyethylene film material is 15% to 25%. The process flow for high-temperature processing is as follows: (1) The sample was left standing for 24 hours under the conditions of 25°C and a relative humidity of 65%, and then the tensile strength R in the MD direction of the sample Ｍ , the tensile strength R in the TD direction Ｔ , the tensile elongation rate E in the MD direction Ｍ , the tensile elongation rate E in the TD direction Ｔ were each measured, and Z ０ was calculated based on the formula, (2) Next, expose to a dry heat atmosphere at 90°C for 6 hours, then cool for 24 hours under conditions of 25°C and 65% relative humidity, (3) Finally, the operation in step (2) is repeated nine more times, and the tensile strength R in the MD direction of the sample is determined. Ｍ１０ , tensile strength R in the TD direction Ｔ１０ , tensile elongation rate E in the MD direction Ｍ１０ , tensile elongation in the TD direction E Ｔ１０ Each of these is measured, and Z is calculated based on the formula. １０ A flash-spun polyethylene film material having good toughness according to claim 1, characterized by calculating the following:

9. The flash-spun polyethylene film material having good toughness, characterized in that the toughness change value ●Z of the flash-spun polyethylene film material is 15% to 20%.

10. The flash-spun polyethylene film material having good toughness, characterized in that the toughness change value ●Z of the flash-spun polyethylene film material is 20% to 25%.

11. A method for preparing a flash-spun polyethylene film material having good toughness, the specific steps being as follows: (1) Preparation of flash evaporation spinning solution: After adding the spinning raw materials and spinning solvent to the high-pressure reaction vessel, the temperature is raised to 160-180°C, and after the temperature rise is complete, nitrogen is introduced and the pressure is increased to 12.5-13 MPa, and finally the temperature is raised to 200-230°C to obtain the flash evaporation spinning solution. The spinning raw materials include polyethylene and tough particles. Tough particles are wrinkled graphene oxide microspheres. (2) Preparation of flash-spun polyethylene film material: The flash evaporative spinning solution prepared in step (1) is flash evaporative spun through a spinning assembly (1) installed in a vacuum chamber to obtain flash spun fibers (3), the flash spun fibers (3) are wrapped and pre-pressurized and then placed in a water tank (6), and further extruded, hot rolled, calendered and wound to obtain flash spun polyethylene film material. A method for preparing a flash-spun polyethylene film material having good toughness, characterized in that the water tank (6) contains a deionized aqueous solution containing a surfactant.

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