Flash evaporation packing material with high tearability

Abstract

The invention relates to a flash packing material with high tearability, which is characterized in that the raw material of the flash packing material comprises polyethylene, and the gram weight of the raw material of the flash packing material is greater than 31 g / m < 2 >; the pendulum bob method longitudinal tearing strength of the flash evaporation packing material is greater than 3N; the pendulum bob method transverse tearing strength of the flash evaporation packing material is greater than 3N; the high tearability of the flash evaporation packing material is 380-620 mN2; the high tearing strength is equal to the longitudinal softness * the longitudinal tearing strength of the pendulum bob method + the transverse softness * the transverse tearing strength of the pendulum bob method. The flash evaporation packing material disclosed by the invention has relatively good softness and also has tear resistance.

Description

[Technical Field]

[0001] This invention relates to the field of flash packaging materials technology, specifically, a high-tear-resistance flash packaging material. [Background Technology]

[0002] Flash spinning is a special fiber manufacturing process. It involves rapidly passing a polymer solution or melt through a spinneret under high pressure into an atmospheric pressure environment, causing the solvent to evaporate instantly and the polymer to solidify rapidly to form fibers. These fibers are then laid into a web and hot-pressed to obtain flash packaging materials.

[0003] Flash packaging materials have the following characteristics: (1) Flash fibers have a unique microstructure and usually have high porosity and specific surface area. (2) Flash evaporation process can produce high-performance fiber materials, such as high strength and high barrier properties.

[0004] In the field of medical packaging, flash-evaporated materials offer significant advantages. First, their high barrier properties effectively prevent the intrusion of bacteria, viruses, and other microorganisms, ensuring the sterility of medical products within the packaging. For example, when used in packaging surgical instruments and pharmaceuticals, they greatly reduce the risk of infection. Second, flash-evaporated materials exhibit excellent chemical stability and will not react chemically with the medical items inside the packaging, guaranteeing the quality and safety of the medical products. For instance, for some chemically sensitive drugs, flash-evaporated packaging helps maintain the stability of their efficacy. Furthermore, flash-evaporated materials possess excellent mechanical properties, capable of withstanding various external forces during transportation and storage without easily breaking. Fragile medical devices, protected by flash-evaporated materials, can safely reach their destination. The application of flash-evaporated materials in medical packaging provides a reliable guarantee for the safe storage and transportation of medical products. However, currently there are cases where flash packaging materials have good softness but poor tear strength, or poor softness but good tear strength. This application aims to explore the raw materials and processes of flash packaging materials that combine both softness and good tear strength, and to find a production process with better overall performance, thereby expanding its application.

[0005] Chinese Patent Publication No. CN118048706 relates to the field of flash-evaporated polyethylene materials technology, and particularly to a wear-resistant flash-evaporated medical protective material and its processing method. This application addresses the problem of poor wear resistance in existing flash-evaporated polyethylene materials by providing a wear-resistant flash-evaporated medical protective material and its processing method, comprising polyethylene, wherein the basis weight of the flash-evaporated medical protective material is greater than 35 g / m³. 2 The oxygen permeability of flash-evaporated medical protective materials is 1.5*10⁻⁶. 9 ~4.5*10 9 cm 3 / (m 2*24h*0.1MPa); The wear resistance grade of the flash-evaporated medical protective material is level 5 or higher. This application found that adding a certain amount of HKUST-1 material doped with iron during the preparation process can significantly improve the wear resistance grade of the flash-evaporated polyethylene material and reduce its oxygen permeability, making it a better material for medical protection.

[0006] Chinese Patent Publication No. CN114908478 relates to a lightweight flash-evaporated polymer nonwoven fabric with a wet tensile strength retention rate of 0.70–0.85, a front surface smoothness of 180–250 seconds, and a basis weight of 35–45 g / m². 2 This application is prepared by flash evaporation process, using polyethylene as the raw material; the thin flash evaporation polymer nonwoven fabric of this application has good toughness and softness, and also has a good wet tensile strength retention rate, which is beneficial to extending its service life.

[0007] Chinese Patent Publication No. CN117926503 relates to the field of flash textile technology, and more particularly to a high-flexibility flash sheet. This application addresses the lack of existing research on modifying the flexibility and heat-blocking properties of flash-spun fabrics, and provides a high-flexibility flash sheet comprising polyethylene, wherein the flexibility of the high-flexibility flash sheet is 1.8–4.0 N. 2 The high-flexibility flash sheet has a heat shielding rate of 10-40%; the testing standards for tensile strength and elongation are ASTM D5035; the testing standards for softness are GB / T8942-2016; and the testing standards for heat shielding rate are GB / T 41560-2022. This application provides a flash sheet that, while ensuring its heat shielding rate is within a suitable range, also possesses high flexibility and strength, meeting relevant market demands.

[0008] Chinese Patent Publication No. CN116590847 relates to a flash fabric with high tensile recovery properties, characterized in that its raw material includes polyethylene, and the basis weight (G) of the flash fabric is greater than 35 g / m². 2 The tensile recovery property RT of the flash fabric is 40% to 70%; the aging toughness Z5 of the flash fabric is 5 to 15 (N·m) / g; where Z5 = [RM5×EM5+RT5×ET5] / G; this application improves the overall performance of the product through the improvement of spinning raw materials and processes.

[0009] Chinese Patent Publication No. CN116334836 relates to a polyethylene flash-spun nonwoven fabric with uniform thickness, wherein the basis weight of the polyethylene flash-spun nonwoven fabric is greater than 50 g / m². 2The thickness of the polyethylene flash-spun nonwoven fabric is 0.1–0.3 mm; the area of ​​the polyethylene flash-spun nonwoven fabric with a thickness in the range of (0.15 mm, 0.2 mm) accounts for more than 60% of the total area of ​​the polyethylene flash-spun nonwoven fabric; the moisture absorption swelling rate of the polyethylene flash-spun nonwoven fabric is 0.5%–0.8% when the relative humidity is between 33% and 84%. The polyethylene flash-spun nonwoven fabric of this application has a uniform texture and good application prospects.

[0010] While the aforementioned patents describe some parameters of flash materials, they do not cover the high tear strength and pendulum tear strength described in this application. [Summary of the Invention]

[0011] The purpose of this invention is to overcome the shortcomings of the prior art and provide a flash packaging material with high tear resistance.

[0012] The objective of this invention is achieved through the following technical solution:

[0013] A high-tear-resistance flash packaging material, characterized in that the raw material of the flash packaging material comprises polyethylene, and the basis weight of the raw material of the flash packaging material is greater than 31 g / m³. 2 ;

[0014] The longitudinal tear strength of flash packaging materials measured by the pendulum test is greater than 3N;

[0015] The transverse tear strength of flash packaging materials using the pendulum test is greater than 3N;

[0016] The high tear strength of flash packaging materials is 380–620 mN. 2 ;

[0017] High tear strength = longitudinal flexibility * pendulum longitudinal tear strength + transverse flexibility * pendulum transverse tear strength;

[0018] The test method for softness is GB / T 8942-2016, which is the determination of paper softness.

[0019] The pendulum method for testing tear strength is the impact pendulum method for determining the tear strength of fabrics according to ASTM D1424-2019.

[0020] The high tear strength of flash packaging materials is 380–400 mN. 2 .

[0021] The high tear strength of flash packaging materials is 400-420 mN. 2 .

[0022] The high tear strength of flash packaging materials is 420–440 mN. 2 .

[0023] The high tear strength of flash packaging materials is 440–460 mN. 2 .

[0024] The high tear strength of flash packaging materials is 460–480 mN. 2 .

[0025] The high tear strength of flash packaging materials is 480–500 mN. 2 .

[0026] The high tear strength of flash packaging materials is 500-520 mN. 2 .

[0027] The high tear strength of flash packaging materials is 520–540 mN. 2 .

[0028] The high tear strength of flash packaging materials is 540–560 mN. 2 .

[0029] The high tear strength of flash packaging materials is 560–580 mN. 2 .

[0030] The high tear strength of flash packaging materials is 580–600 mN. 2 .

[0031] The high tear strength of flash packaging materials is 600-620 mN. 2 .

[0032] The longitudinal tear strength of flash packaging materials measured by the pendulum test is greater than 3.5 N.

[0033] The longitudinal tear strength of flash packaging materials using the pendulum test is greater than 4N.

[0034] The longitudinal tear strength of flash packaging materials measured by the pendulum test is greater than 4.5 N.

[0035] The longitudinal tear strength of flash packaging materials measured by the pendulum test is greater than 5N.

[0036] The transverse tear strength of flash packaging materials measured by the pendulum test is greater than 3.5N.

[0037] The transverse tear strength of flash packaging materials measured by the pendulum test is greater than 4N.

[0038] The transverse tear strength of flash packaging materials measured by the pendulum test is greater than 4.5 N.

[0039] The transverse tear strength of flash packaging materials measured by the pendulum test is greater than 5N.

[0040] The raw material weight of flash packaging material is less than 150g / m³. 2 .

[0041] The raw material weight of flash packaging material is less than 120g / m³. 2 .

[0042] The raw material weight of flash packaging material is less than 90g / m³.2 .

[0043] A method for preparing a flash packaging material, comprising the following technical steps:

[0044] (1) Melting: The mixture of polyethylene particles, nano-silicon and large specific surface area single-walled carbon nanotubes is fed into the screw extruder at a speed of 750±10kg / h and melted at a temperature of 180~280℃ by electric heating to obtain PE melt; after the melt is filtered to remove impurities by melt filter, the input flow rate of melt is accurately measured by melt metering pump.

[0045] Nano-silicon, with a particle size of less than 5 nanometers, is characterized by high purity, small particle size, and uniform distribution. It also features a large surface area and high surface activity.

[0046] Large specific surface area single-walled carbon nanotubes, with a specific surface area greater than 1075 m² 2 / g, outer diameter less than 2 nanometers, length 5-30 micrometers;

[0047] In the mixture of the three, the mass fraction of nano-silicon is 1-2%, the mass fraction of large specific surface area single-walled carbon nanotubes is 1-2%, and polyethylene particles are the balance.

[0048] Adding nano-silicon to the raw materials of flash materials can increase their flexibility and improve their tear strength. The nano-silicon particles form a strong interfacial interaction with the flash material matrix, which enhances the adhesion between materials, thereby improving the overall performance. Nano-silicon possesses a high specific surface area and excellent mechanical properties, which allow it to disperse uniformly within the material, forming a reinforcing phase and further improving the flexibility and tear strength of the flash packaging material.

[0049] In flash packaging materials, the presence of large specific surface area single-walled carbon nanotubes (SUVs) can increase the material's flexibility and improve its tear strength. SUVs possess excellent mechanical properties, effectively bearing and transferring loads, thereby enhancing the strength and tear strength of flash packaging materials. The high flexibility and nanoscale size of SUVs can improve the microstructure of flash packaging materials, increasing flexibility while maintaining strength. SUVs with large aspect ratios may form network structures within the material, further enhancing the mechanical properties of the flash packaging material.

[0050] (2) Delivery: The spinning solvent in the solvent tank is first delivered to the filter by the delivery pump, then pressurized to 7-10 MPa by the high-pressure pump group, and heated to 180-280°C by the heat exchanger. The pressurized and heated solvent is then delivered to the mixer along with the filtered PE fluid through a closed pipeline at a flow rate of 5-10 t / h. After thorough mixing, the flash spinning solution is obtained, and then the flash spinning solution is delivered to the spinning box for spinning.

[0051] The spinning solvent is an aromatic hydrocarbon, unsaturated hydrocarbon, halogenated hydrocarbon, alcohol, ester, fluorocarbon, or similar substance;

[0052] In the flash spinning solution, the mass fraction of the mixture of polyethylene particles, nano-silicon and large specific surface area single-walled carbon nanotubes is 9-14%.

[0053] (3) Spinning: The fully mixed flash spinning solution is sent to the spinneret through a closed pipe and sprayed out. Due to the instantaneous pressure relief, the spinning solution instantly solidifies into filaments and settles evenly on the mesh belt of the web forming machine at the bottom of the box. The solvent instantly vaporizes into solvent vapor. The raw fibers that settle evenly on the mesh belt enter the post-processing section from the front of the spinning box at a speed of 50-120 m / min. They are first pre-pressed to obtain pre-pressed fabric.

[0054] (4) Post-processing: The pre-pressed fabric is hot rolled multiple times by the rolling mill roller group. The rolling mill roller is electrically heated by a heat transfer oil furnace at a temperature of 100℃~200℃. After rolling, it is dried, cooled, and rolled up. After offline testing, the finished flash packaging material is obtained.

[0055] Compared with the prior art, the positive effects of the present invention are:

[0056] When nano-silicon and large-specific-surface-area single-walled carbon nanotubes work together, their synergistic effect can significantly improve the performance of flash materials. The uniform dispersion, strengthening, and flexibility-improving effects of nano-silicon complement and enhance the load transfer, molecular chain movement restriction, and network structure formation effects of single-walled carbon nanotubes, jointly achieving increased flexibility and improved tear strength in flash materials.

Detailed Implementation Methods

[0057] The following provides a specific embodiment of a high-tear-resistance flash packaging material according to the present invention.

[0058] Example 1

[0059] A method for preparing a flash packaging material, comprising the following technical steps:

[0060] (1) Melting: The mixture of polyethylene particles, nano-silicon and large specific surface area single-walled carbon nanotubes is fed into the screw extruder at a rate of 740 kg / h and melted at 200°C by electric heating to obtain PE melt; after the melt is filtered to remove impurities by melt filter, the input flow rate of melt is accurately measured by melt metering pump.

[0061] Nano-silicon, with a particle size of less than 5 nanometers, is characterized by high purity, small particle size, and uniform distribution. It also features a large surface area and high surface activity.

[0062] Large specific surface area single-walled carbon nanotubes, with a specific surface area greater than 1075 m² 2 / g, outer diameter less than 2 nanometers, length 5-30 micrometers;

[0063] In the mixture of the three, the mass fraction of nano-silicon is 1%, the mass fraction of large specific surface area single-walled carbon nanotubes is 1%, and the mass fraction of polyethylene particles is 98%.

[0064] Adding nano-silicon to the raw materials of flash materials can increase their flexibility and improve their tear strength. The nano-silicon particles form a strong interfacial interaction with the flash material matrix, which enhances the adhesion between materials, thereby improving the overall performance. Nano-silicon possesses a high specific surface area and excellent mechanical properties, which allow it to disperse uniformly within the material, forming a reinforcing phase and further improving the flexibility and tear strength of the flash packaging material.

[0065] In flash packaging materials, the presence of large specific surface area single-walled carbon nanotubes (SUVs) can increase the material's flexibility and improve its tear strength. SUVs possess excellent mechanical properties, effectively bearing and transferring loads, thereby enhancing the strength and tear strength of flash packaging materials. The high flexibility and nanoscale size of SUVs can improve the microstructure of flash packaging materials, increasing flexibility while maintaining strength. SUVs with large aspect ratios may form network structures within the material, further enhancing the mechanical properties of the flash packaging material.

[0066] (2) Delivery: The spinning solvent in the solvent tank is first delivered to the filter by the delivery pump, then pressurized to 7.5MPa by the high-pressure pump group, and heated to 200℃ by the heat exchanger. The pressurized and heated solvent is then delivered to the mixer along with the filtered PE fluid through a closed pipeline at a flow rate of 6t / h. After thorough mixing, the flash spinning solution is obtained, and then the flash spinning solution is delivered to the spinning box for spinning.

[0067] The spinning solvent is trans-1,2-dichloroethylene, 1H,6H-perfluorohexane, and 1,1,1,3,3-pentafluorobutane, with a mass ratio of 8:1:1.

[0068] In the flash spinning solution, the mass fraction of the mixture of polyethylene particles, nano-silicon and large specific surface area single-walled carbon nanotubes is 9%.

[0069] (3) Spinning: The fully mixed flash spinning solution is sent to the spinneret through a closed pipe and sprayed out. Due to the instantaneous pressure relief, the spinning solution instantly solidifies into filaments and settles evenly on the mesh belt of the web forming machine at the bottom of the box. The solvent instantly vaporizes into solvent vapor. The raw fibers that settle evenly on the mesh belt enter the post-processing section from the front of the spinning box at a speed of 65 m / min. They are first pre-pressed to obtain pre-pressed fabric.

[0070] (4) Post-processing: The pre-pressed fabric is hot rolled multiple times by the rolling mill roller group. The rolling mill roller is electrically heated by a heat transfer oil furnace at a temperature of 100℃~200℃. After rolling, it is dried, cooled, and rolled up. After offline testing, the finished flash packaging material is obtained.

[0071] Example 2

[0072] A method for preparing a flash packaging material, comprising the following technical steps:

[0073] (1) Melting: The mixture of polyethylene particles, nano-silicon and large specific surface area single-walled carbon nanotubes is fed into the screw extruder at a speed of 750 kg / h and melted at 220°C by electric heating to obtain PE melt; after the melt is filtered to remove impurities by melt filter, the input flow rate of melt is accurately measured by melt metering pump.

[0074] Nano-silicon, with a particle size of less than 5 nanometers, is characterized by high purity, small particle size, and uniform distribution. It also features a large surface area and high surface activity.

[0075] Large specific surface area single-walled carbon nanotubes, with a specific surface area greater than 1075 m² 2 / g, outer diameter less than 2 nanometers, length 5-30 micrometers;

[0076] In the mixture of the three components, the mass fraction of nano-silicon is 1.5%, the mass fraction of large specific surface area single-walled carbon nanotubes is 1.5%, and the mass fraction of polyethylene particles is 97%.

[0077] (2) Delivery: The spinning solvent in the solvent tank is first delivered to the filter by the delivery pump, then pressurized to 8.5MPa by the high-pressure pump group, and heated to 220℃ by the heat exchanger. The pressurized and heated solvent is then delivered to the mixer along with the filtered PE fluid through a closed pipeline at a flow rate of 8t / h. After thorough mixing, the flash spinning solution is obtained, and then the flash spinning solution is delivered to the spinning box for spinning.

[0078] The spinning solvent is trans-1,2-dichloroethylene, 1H,6H-perfluorohexane, and 1,1,1,3,3-pentafluorobutane, with a mass ratio of 8:1:1.

[0079] In the flash spinning solution, the mass fraction of the mixture of polyethylene particles, nano-silicon and large specific surface area single-walled carbon nanotubes in the flash spinning solution is 10%.

[0080] (3) Spinning: The fully mixed flash spinning solution is sent to the spinneret through a closed pipe and sprayed out. Due to the instantaneous pressure relief, the spinning solution instantly solidifies into filaments and settles evenly on the mesh belt of the web forming machine at the bottom of the box. The solvent instantly vaporizes into solvent vapor. The raw fibers that settle evenly on the mesh belt enter the post-processing section from the front of the spinning box at a speed of 80m / min. They are first pre-pressed to obtain pre-pressed fabric.

[0081] (4) Post-processing: The pre-pressed fabric is hot rolled multiple times by the rolling mill roller group. The rolling mill roller is electrically heated by a heat transfer oil furnace at a temperature of 100℃~200℃. After rolling, it is dried, cooled, and rolled up. After offline testing, the finished flash packaging material is obtained.

[0082] Example 3

[0083] A method for preparing a flash packaging material, comprising the following technical steps:

[0084] (1) Melting: The mixture of polyethylene particles, nano-silicon and large specific surface area single-walled carbon nanotubes is fed into the screw extruder at a speed of 760 kg / h and melted at 250°C by electric heating to obtain PE melt; after the melt is filtered to remove impurities by melt filter, the input flow rate of melt is accurately measured by melt metering pump.

[0085] Nano-silicon, with a particle size of less than 5 nanometers, is characterized by high purity, small particle size, and uniform distribution. It also features a large surface area and high surface activity.

[0086] Large specific surface area single-walled carbon nanotubes, with a specific surface area greater than 1075 m² 2 / g, outer diameter less than 2 nanometers, length 5-30 micrometers;

[0087] In the mixture of the three, the mass fraction of nano-silicon is 2%, the mass fraction of large specific surface area single-walled carbon nanotubes is 2%, and the mass fraction of polyethylene particles is 96%.

[0088] (2) Delivery: The spinning solvent in the solvent tank is first delivered to the filter by the delivery pump, then pressurized to 10MPa by the high-pressure pump group, and heated to 250℃ by the heat exchanger. The pressurized and heated solvent is then delivered to the mixer along with the filtered PE fluid through a closed pipeline at a flow rate of 10t / h. After thorough mixing, the flash spinning solution is obtained, and then the flash spinning solution is delivered to the spinning box for spinning.

[0089] The spinning solvent is trans-1,2-dichloroethylene, 1H,6H-perfluorohexane, and 1,1,1,3,3-pentafluorobutane, with a mass ratio of 8:1:1.

[0090] In the flash spinning solution, the mass fraction of the mixture of polyethylene particles, nano-silicon and large specific surface area single-walled carbon nanotubes in the flash spinning solution is 12%.

[0091] (3) Spinning: The fully mixed flash spinning solution is sent to the spinneret through a closed pipe and sprayed out. Due to the instantaneous pressure relief, the spinning solution instantly solidifies into filaments and settles evenly on the mesh belt of the web forming machine at the bottom of the box. The solvent instantly vaporizes into solvent vapor. The raw fibers that settle evenly on the mesh belt enter the post-processing section from the front of the spinning box at a speed of 110 m / min. They are first pre-pressed to obtain pre-pressed fabric.

[0092] (4) Post-processing: The pre-pressed fabric is hot rolled multiple times by the rolling mill roller group. The rolling mill roller is electrically heated by a heat transfer oil furnace at a temperature of 100℃~200℃. After rolling, it is dried, cooled, and rolled up. After offline testing, the finished flash packaging material is obtained.

[0093] Comparative Example 1

[0094] A method for preparing a flash packaging material, comprising the following technical steps:

[0095] (1) Melting: The mixture of polyethylene particles, nano-silicon and large specific surface area single-walled carbon nanotubes is fed into the screw extruder at a speed of 750 kg / h and melted at 220°C by electric heating to obtain PE melt; after the melt is filtered to remove impurities by melt filter, the input flow rate of melt is accurately measured by melt metering pump.

[0096] Nano-silicon, with a particle size of less than 5 nanometers, is characterized by high purity, small particle size, and uniform distribution. It also features a large surface area and high surface activity.

[0097] Large specific surface area single-walled carbon nanotubes, with a specific surface area greater than 1075 m² 2 / g, outer diameter less than 2 nanometers, length 5-30 micrometers;

[0098] In the mixture of the three components, the mass fraction of nano-silicon is 0.5%, the mass fraction of large specific surface area single-walled carbon nanotubes is 0.5%, and the mass fraction of polyethylene particles is 99%.

[0099] (2) Delivery: The spinning solvent in the solvent tank is first delivered to the filter by the delivery pump, then pressurized to 8.5MPa by the high-pressure pump group, and heated to 220℃ by the heat exchanger. The pressurized and heated solvent is then delivered to the mixer along with the filtered PE fluid through a closed pipeline at a flow rate of 8t / h. After thorough mixing, the flash spinning solution is obtained, and then the flash spinning solution is delivered to the spinning box for spinning.

[0100] The spinning solvent is trans-1,2-dichloroethylene, 1H,6H-perfluorohexane, and 1,1,1,3,3-pentafluorobutane, with a mass ratio of 8:1:1.

[0101] In the flash spinning solution, the mass fraction of the mixture of polyethylene particles, nano-silicon and large specific surface area single-walled carbon nanotubes in the flash spinning solution is 10%.

[0102] (3) Spinning: The fully mixed flash spinning solution is sent to the spinneret through a closed pipe and sprayed out. Due to the instantaneous pressure relief, the spinning solution instantly solidifies into filaments and settles evenly on the mesh belt of the web forming machine at the bottom of the box. The solvent instantly vaporizes into solvent vapor. The raw fibers that settle evenly on the mesh belt enter the post-processing section from the front of the spinning box at a speed of 80m / min. They are first pre-pressed to obtain pre-pressed fabric.

[0103] (4) Post-processing: The pre-pressed fabric is hot rolled multiple times by the rolling mill roller group. The rolling mill roller is electrically heated by a heat transfer oil furnace at a temperature of 100℃~200℃. After rolling, it is dried, cooled, and rolled up. After offline testing, the finished flash packaging material is obtained.

[0104] Comparative Example 2

[0105] A method for preparing a flash packaging material, comprising the following technical steps:

[0106] (1) Melting: The mixture of polyethylene particles, nano-silicon and large specific surface area single-walled carbon nanotubes is fed into the screw extruder at a speed of 750 kg / h and melted at 220°C by electric heating to obtain PE melt; after the melt is filtered to remove impurities by melt filter, the input flow rate of melt is accurately measured by melt metering pump.

[0107] Nano-silicon, with a particle size of less than 5 nanometers, is characterized by high purity, small particle size, and uniform distribution. It also features a large surface area and high surface activity.

[0108] Large specific surface area single-walled carbon nanotubes, with a specific surface area greater than 1075 m²2 / g, outer diameter less than 2 nanometers, length 5-30 micrometers;

[0109] In the mixture of the three components, the mass fraction of nano-silicon is 2.5%, the mass fraction of large specific surface area single-walled carbon nanotubes is 2.5%, and the mass fraction of polyethylene particles is 95%.

[0110] (2) Delivery: The spinning solvent in the solvent tank is first delivered to the filter by the delivery pump, then pressurized to 8.5MPa by the high-pressure pump group, and heated to 220℃ by the heat exchanger. The pressurized and heated solvent is then delivered to the mixer along with the filtered PE fluid through a closed pipeline at a flow rate of 8t / h. After thorough mixing, the flash spinning solution is obtained, and then the flash spinning solution is delivered to the spinning box for spinning.

[0111] The spinning solvent is trans-1,2-dichloroethylene, 1H,6H-perfluorohexane, and 1,1,1,3,3-pentafluorobutane, with a mass ratio of 8:1:1.

[0112] In the flash spinning solution, the mass fraction of the mixture of polyethylene particles, nano-silicon and large specific surface area single-walled carbon nanotubes in the flash spinning solution is 10%.

[0113] (3) Spinning: The fully mixed flash spinning solution is sent to the spinneret through a closed pipe and sprayed out. Due to the instantaneous pressure relief, the spinning solution instantly solidifies into filaments and settles evenly on the mesh belt of the web forming machine at the bottom of the box. The solvent instantly vaporizes into solvent vapor. The raw fibers that settle evenly on the mesh belt enter the post-processing section from the front of the spinning box at a speed of 80m / min. They are first pre-pressed to obtain pre-pressed fabric.

[0114] (4) Post-processing: The pre-pressed fabric is hot rolled multiple times by the rolling mill roller group. The rolling mill roller is electrically heated by a heat transfer oil furnace at a temperature of 100℃~200℃. After rolling, it is dried, cooled, and rolled up. After offline testing, the finished flash packaging material is obtained.

[0115] Comparative Example 3

[0116] A method for preparing a flash packaging material, comprising the following technical steps:

[0117] (1) Melting: The mixture of polyethylene particles and nano-silicon is fed into the screw extruder at a rate of 750 kg / h and melted at 220°C by electric heating to obtain PE melt; after the melt is filtered by a melt filter to remove impurities, the melt input flow rate is accurately measured by a melt metering pump;

[0118] Nano-silicon, with a particle size of less than 5 nanometers, is characterized by high purity, small particle size, and uniform distribution. It also features a large surface area and high surface activity.

[0119] In the mixture, the mass fraction of nano-silicon is 1.5%, and the mass fraction of polyethylene particles is 98.5%.

[0120] (2) Delivery: The spinning solvent in the solvent tank is first delivered to the filter by the delivery pump, then pressurized to 8.5MPa by the high-pressure pump group, and heated to 220℃ by the heat exchanger. The pressurized and heated solvent is then delivered to the mixer along with the filtered PE fluid through a closed pipeline at a flow rate of 8t / h. After thorough mixing, the flash spinning solution is obtained, and then the flash spinning solution is delivered to the spinning box for spinning.

[0121] The spinning solvent is trans-1,2-dichloroethylene, 1H,6H-perfluorohexane, and 1,1,1,3,3-pentafluorobutane, with a mass ratio of 8:1:1.

[0122] In the flash spinning solution, the mass fraction of the mixture of polyethylene particles, nano-silicon and large specific surface area single-walled carbon nanotubes in the flash spinning solution is 10%.

[0123] (3) Spinning: The fully mixed flash spinning solution is sent to the spinneret through a closed pipe and sprayed out. Due to the instantaneous pressure relief, the spinning solution instantly solidifies into filaments and settles evenly on the mesh belt of the web forming machine at the bottom of the box. The solvent instantly vaporizes into solvent vapor. The raw fibers that settle evenly on the mesh belt enter the post-processing section from the front of the spinning box at a speed of 80m / min. They are first pre-pressed to obtain pre-pressed fabric.

[0124] (4) Post-processing: The pre-pressed fabric is hot rolled multiple times by the rolling mill roller group. The rolling mill roller is electrically heated by a heat transfer oil furnace at a temperature of 100℃~200℃. After rolling, it is dried, cooled, and rolled up. After offline testing, the finished flash packaging material is obtained.

[0125] Comparative Example 4

[0126] A method for preparing a flash packaging material, comprising the following technical steps:

[0127] (1) Melting: The mixture of polyethylene particles and large specific surface area single-walled carbon nanotubes is fed into the screw extruder at a speed of 750 kg / h and melted at 220°C by electric heating to obtain PE melt; after the melt is filtered by melt filter to remove impurities, the melt input flow rate is accurately measured by melt metering pump.

[0128] In the mixture, the mass fraction of high specific surface area single-walled carbon nanotubes is 1.5%, and that of polyethylene particles is 98.5%.

[0129] (2) Delivery: The spinning solvent in the solvent tank is first delivered to the filter by the delivery pump, then pressurized to 8.5MPa by the high-pressure pump group, and heated to 220℃ by the heat exchanger. The pressurized and heated solvent is then delivered to the mixer along with the filtered PE fluid through a closed pipeline at a flow rate of 8t / h. After thorough mixing, the flash spinning solution is obtained, and then the flash spinning solution is delivered to the spinning box for spinning.

[0130] The spinning solvent is trans-1,2-dichloroethylene, 1H,6H-perfluorohexane, and 1,1,1,3,3-pentafluorobutane, with a mass ratio of 8:1:1.

[0131] In the flash spinning solution, the mass fraction of the mixture of polyethylene particles, nano-silicon and large specific surface area single-walled carbon nanotubes in the flash spinning solution is 10%.

[0132] (3) Spinning: The fully mixed flash spinning solution is sent to the spinneret through a closed pipe and sprayed out. Due to the instantaneous pressure relief, the spinning solution instantly solidifies into filaments and settles evenly on the mesh belt of the web forming machine at the bottom of the box. The solvent instantly vaporizes into solvent vapor. The raw fibers that settle evenly on the mesh belt enter the post-processing section from the front of the spinning box at a speed of 80m / min. They are first pre-pressed to obtain pre-pressed fabric.

[0133] (4) Post-processing: The pre-pressed fabric is hot rolled multiple times by the rolling mill roller group. The rolling mill roller is electrically heated by a heat transfer oil furnace at a temperature of 100℃~200℃. After rolling, it is dried, cooled, and rolled up. After offline testing, the finished flash packaging material is obtained.

[0134] Table 1 Performance Table of this Application

[0135] High tear mN 2 ]] pendulum method, longitudinal tear strength N pendulum method, longitudinal tear strength N Example 1 441 6.6 6.2 Example 2 498 7.1 6.6 Example 3 565 7.7 6.9 Comparative Example 1 355 5.8 5.3 Comparative Example 2 641 10.1 9.6 Comparative Example 3 317 6.2 5.6 Comparative Example 4 334 6.0 5.5

[0136] The above description is only a preferred embodiment of the present invention. It should be noted that those skilled in the art can make several improvements and modifications without departing from the concept of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A high tear strength flash laminate characterized in that, The feedstock of the flash-laminated material comprises polyethylene, the weight of the feedstock of the flash-laminated material is greater than 31 g / m 2 ; The pendulum method longitudinal tear strength of the flash-laminated material is greater than 3N; The pendulum method transverse tear strength of the flash-laminated material is greater than 3N; The high tearability of the flash-laminated material is 380-620 mN 2 ; High tear degree = longitudinal softness * pendulum method longitudinal tear strength + transverse softness * pendulum method transverse tear strength.

2. A high tear strength flash laminate according to claim 1, wherein, The high tearability of the flash-laminated material is 380-400 mN 2 .

3. A high tear strength flash laminate according to claim 1, wherein, The high tearability of the flash-laminated material is 400-420 mN 2 .

4. A high tear strength flash laminate according to claim 1, wherein, The high tearability of the flash-laminated material is 420-440 mN 2 .

5. A high tear strength flash laminate according to claim 1 wherein, The high tearability of the flash-laminated material is 440-460 mN 2 .

6. A high tear strength flash laminate according to claim 1, wherein, The high tearability of the flash-laminated material is 460-480 mN 2 .

7. A high tear strength flash laminate according to claim 1 wherein, The high tearability of the flash-laminated material is 480-500 mN 2 .

8. A high tear strength flash laminate according to claim 1, wherein, The high tearability of the flash-laminated material is 500-520 mN 2 .

9. A high tear strength flash laminate according to claim 1 wherein, The high tearability of the flash-laminated material is 520-540 mN 2 .

10. A high tear strength flash laminate according to claim 1 wherein, The high tearability of the flash-laminated material is 540-560 mN 2 .

11. A high tear strength flash laminate according to claim 1, wherein, The high tearability of the flash-laminated material is 560-580 mN 2 .

12. A high tear strength flash laminate according to claim 1, wherein, The high tearability of the flash-laminated material is 580-600 mN 2 .

13. A high tear strength flash web material as defined in claim 1, wherein, The high tearability of the flash-laminated material is 600-620 mN 2 .

14. A high tear strength flash laminate according to claim 1, wherein, The pendulum method longitudinal tear strength of the flash-laminated material is greater than 3.5N.

15. A high tear resistance flash steam packaging material as claimed in claim 1, characterized in that, The pendulum method longitudinal tear strength of the flash-laminated material is greater than 4N.

16. A high tear resistance flash steam packaging material as claimed in claim 1, characterized in that, The pendulum method transverse tear strength of the flash-laminated material is greater than 3.5N.

17. A high tear strength flash web material as defined in claim 1, wherein, The pendulum method transverse tear strength of the flash-laminated material is greater than 4N.

18. A high tear strength flash web material as defined in claim 1, wherein, The raw material of the flash packer has a grammage of less than 150 g / m 2 .

19. A high tear resistance flash steam packaging material as claimed in claim 1, characterized in that, The raw material of the flash packer has a grammage of less than 120 g / m 2 .

20. A high tear resistance, flash steaming wrapper material as defined in claim 1, wherein, The raw material of the flash packer has a grammage of less than 90 g / m 2 .

21. The method for preparing a high-tear-resistance flash packaging material as described in claim 1, characterized in that, The technical steps thereof comprise: (1) Melting: the mixture of polyethylene particles, nano-silicon and single-walled carbon nanotubes with large specific surface area is conveyed into a screw extruder at a speed of 750±10 kg / h, melted at a temperature of 180-280°C by electric heating, and PE melt is obtained; the PE melt is filtered by a melt filter to remove impurities, and PE fluid is obtained; (2) Conveying: the spinning solvent in the solvent tank is first conveyed to a filter by a conveying pump, pressurized to 7-10 MPa by a high-pressure pump group, heated to 180-280°C by a heat exchanger, and then fed into a mixer at a flow rate of 5-10 t / h together with the filtered PE fluid, fully stirred and mixed to obtain flash spinning liquid, and then the flash spinning liquid is conveyed to a spinning box for spinning; (3) Spinning: the fully mixed flash spinning liquid is sent to the spinneret through a closed pipeline, and due to instantaneous pressure relief, the spinning liquid is instantly solidified into a filament, uniformly settled on the mesh belt of the mesh machine at the bottom of the spinning box, and the uniformly settled original fibers on the mesh belt enter the post-processing section at a speed of 50-120 m / min from the front section of the spinning box, and are first pre-pressed to obtain a pre-pressed cloth; (4) Post-processing: the pre-pressed cloth is again hot-rolled multiple times by a rolling cylinder group, the rolling cylinder is heated by electric heating through a heat conduction oil furnace, the heating temperature is 100-200°C, and after rolling, the cloth is then subjected to drying, cooling, winding, and offline detection to obtain a flash-laminated material product.

22. A method of making a high tear strength flash laminate according to claim 21, wherein, The nano-silicon has a particle size of less than 5 nanometers.

23. The method for preparing a high-tear-resistance flash packaging material as described in claim 21, characterized in that, Large specific surface area single-walled carbon nanotubes having a specific surface area greater than 1075 m 2 / g.