A flash-spun fabric with low compression ratio

Abstract

The present invention relates to a flash-spun fabric with low compression ratio, wherein the raw material of the flash-spun fabric comprises polyethylene, and the gram weight of the flash-spun fabric is 35 g / m 2 Above; compression ratio of flash spun fabric is greater than 0.08gf·cm / cm 2 The hygroscopic expansion rate of the flash-spun fabric is 0.2% to 0.4% when the relative humidity is between 33% and 84%. The flash-spun fabric of the present application has a wide range of applications.

Description

Technical Field

[0001] The invention relates to the technical field of flash spinning, in particular to a flash-spun fabric with low compression ratio. Background Art

[0002] Non-woven fabrics, also known as non-woven fabrics, needle-punched cotton, and needle-punched non-woven fabrics, are made from polyester fibers or polyester fibers (PET) through a needle-punching process. They can be produced in various thicknesses, textures, and hardnesses. They are moisture-resistant, breathable, flexible, lightweight, flame-retardant, non-toxic, odorless, inexpensive, and recyclable. They are used in various industries, such as sound insulation, heat insulation, heaters, masks, clothing, medical applications, and filling materials. Currently, the market is dominated by three major categories: polyester, polypropylene, and viscose non-woven fabrics; nylon (PA), acrylic, high-density polyethylene (HDPE), and polyvinyl chloride (PVC); however, polyethylene non-woven fabrics made from PE are less common. From 2016 to 2019, my country's non-woven fabric production experienced slow growth, with an average annual growth rate of less than 10%.

[0003] Flash spinning technology was first invented by DuPont and has held a monopoly since 1960. Flash spinning is a spinning method in which a polymer solution is kept above the boiling point of the solvent and extruded through a spinneret under high pressure until it reaches normal pressure. During spinning, the pressure suddenly drops, causing the solvent to evaporate rapidly, ejecting extremely fine strands. The most prominent phenomenon of flash spinning is phase separation. During the dissolution process, the polymer and solvent are stirred at high temperature and high pressure to transform into a homogeneous solution. In a low-pressure chamber, the pressure is slightly reduced, causing the solution to undergo a certain degree of phase separation, forming a two-phase solution: one phase is polymer-rich and the other is solvent-rich. Finally, when the solution enters air at room temperature and pressure through the spinneret, the solvent converts to vapor and rapidly separates from the polymer. This shows that flash spinning technology differs significantly from traditional nonwoven fabric preparation processes. The process of this application uses a flash evaporation process to prepare flash-spun fabrics. Currently, flash-spun fabrics on the market have technical pain points such as high loft (i.e., not easy to compress) and a large expansion coefficient under high temperature and high humidity conditions, which leads to deformation of non-woven fabrics or graphics or text printed on non-woven fabrics. This application aims to improve the flash spinning process to address the two existing technical pain points, thereby obtaining flash-spun fabrics with relatively good performance and low compression ratio. Summary of the Invention

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a flash-spun fabric with low compression ratio.

[0005] The object of the present invention is achieved through the following technical solutions:

[0006] A flash-spun fabric with low compression ratio, the raw material of which comprises polyethylene,

[0007] The weight of flash spun fabric is 35g / m 2 above;

[0008] The compression ratio of flash spun fabrics is greater than 0.08 gf·cm / cm 2 ;

[0009] The hygroscopic expansion rate of flash-spun fabrics is 0.2% to 0.4% when the relative humidity is between 33% and 84%.

[0010] The hygroscopic expansion rate of flash-spun fabrics is 0.2% to 0.4% when the relative humidity is between 33% and 84%, and both the transverse and longitudinal hygroscopic expansion rates of flash-spun fabrics are between 0.2% and 0.4%.

[0011] The performance tests of compression ratio work and surface roughness of this application are carried out by using a KES style tester. The ambient temperature is 20±2°C and the relative humidity is 65%±4%RH. The compression ratio work is tested by FB3 and the surface roughness is tested by FB4.

[0012] The hygroscopic expansion rate test at a relative humidity between 33% and 84% in this application was conducted in accordance with the national standard GBT 22899.2-2008, Paper and paperboard—Determination of hygroscopic expansion rate—Part 2: Hygroscopic expansion rate during a period of increasing relative humidity up to a maximum of 86%. Hygroscopic expansion rate is defined as the change in length of a sample of known length as the relative humidity equilibrates and increases from a specified lower value to a specified higher value (if shrinkage occurs, the hygroscopic expansion rate may be negative). This application was tested in accordance with GBT 22899.2-2008, with a test sample size of 150 mm by 20 mm, a test load of 15 N / m, a 100 mm clamp at the start of the test, and a constant temperature and humidity chamber.

[0013] Flash spun fabrics weighing less than 60 g / m 2 .

[0014] Flash spun fabrics weighing less than 50 g / m 2 .

[0015] The compression ratio of flash spun fabrics is 0.08 to 0.15 gf·cm / cm 2 .

[0016] The compression ratio of flash spun fabrics is 0.15 to 0.2 gf·cm / cm 2 .

[0017] The compression ratio of flash spun fabrics is 0.2 to 0.3 gf·cm / cm 2 .

[0018] The compression ratio of flash spun fabrics is 0.3 to 0.5 gf·cm / cm 2 .

[0019] The hygroscopic expansion rate of flash-spun fabrics is 0.2% to 0.3% when the relative humidity is between 33% and 84%.

[0020] The hygroscopic expansion rate of flash-spun fabrics is 0.3% to 0.4% when the relative humidity is between 33% and 84%.

[0021] The ratio of the longitudinal hygroscopic expansion rate to the transverse hygroscopic expansion rate of flash-spun fabrics is less than 1 when the relative humidity is between 33% and 84%.

[0022] The ratio of the longitudinal hygroscopic expansion rate to the transverse hygroscopic expansion rate of the flash-spun fabric when the relative humidity is between 33% and 84% is greater than 0.5.

[0023] When the relative humidity of flash-spun fabrics is between 33% and 84%, the ratio of the longitudinal hygroscopic expansion rate to the transverse hygroscopic expansion rate is between 0.65 and 0.85.

[0024] The surface roughness of flash spun fabrics is 2 to 3.5 microns.

[0025] The surface roughness of the flash-spun fabric is 2.6 to 3 microns.

[0026] Compared with the prior art, the present invention has the following positive effects:

[0027] When the flash fiber just comes out of the spinneret, the temperature of the flash fiber is relatively high. Using a self-circulating airflow with a lower wind speed for cooling can not only keep the flash fiber at a suitable viscosity and help reduce subsequent resistance, but also importantly reduce the disturbance of the flash fiber and reduce the probability of yarn doubling; ultimately, the fiber is more uniform when laying the web, and the tissue density tends to be consistent, which is beneficial to reducing the compression ratio and expansion coefficient of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic structural diagram of a processing device for flash-spun fabrics according to the present invention;

[0029] In the figure: spinning box 1, spinneret 2, spinning baffle 3, pipeline 4, self-circulating bellows 5, fan 6, first partition 7, second partition 8, third partition 9, damping plate 10, first wind speed pump 11, second wind speed pump 12, third wind speed pump 13, first air outlet duct 14, second air outlet duct 15, third air outlet duct 16, flash spun fiber 17. DETAILED DESCRIPTION

[0030] The following provides a specific embodiment of a flash-spun fabric with low compression ratio according to the present invention.

[0031] A method for processing a flash-spun fabric with a low compression ratio comprises the following steps:

[0032] Step 1: Processing of spinning solution:

[0033] dissolving the polymer raw material in a spinning solvent to obtain a spinning solution;

[0034] The mass fraction of the polymer raw material in the spinning solution is 8 to 19%, preferably 10 to 13%;

[0035] The polymer raw materials include polyethylene and modified inorganic substances;

[0036] The mass fraction of the modified inorganic substance in the polymer raw material is 1.25 to 2.25%;

[0037] A processing method for modified inorganic substances: the specific steps are:

[0038] The egg-box-shaped three-dimensional carbon material is dispersed in a sodium hydroxide solution for 4 to 5 hours, and then an aluminum chloride solution is slowly added to the system at a reaction temperature of 40 to 65°C and a stirring speed of 1600 to 2000 rpm. After the aluminum chloride solution is added within 2 to 2.5 hours, the reaction temperature is raised to 85 to 95°C and the reaction is continued for 2 to 3 hours to allow aluminum ions to be adsorbed in the micropores of the egg-box-shaped three-dimensional carbon material, thereby generating aluminum hydroxide in the micropores of the egg-box-shaped three-dimensional carbon material. The reaction solution is then subjected to high-speed centrifugation at 5000 to 5500 rpm for 1 to 1.5 hours, and the bottom precipitate after centrifugation is collected. The precipitate is vacuum-heated and dried to obtain an egg-box-shaped three-dimensional carbon material modification having aluminum hydroxide adsorbed on its surface and in its micropores.

[0039] The mass fraction of the egg-box-shaped three-dimensional carbon material in the sodium hydroxide solution is 30-35%;

[0040] The mass ratio of aluminum chloride in the aluminum chloride solution to the egg-box-shaped three-dimensional carbon material is 1:8 to 1:10;

[0041] The egg-box-shaped three-dimensional carbon material is an egg-box-shaped three-dimensional carbon material co-doped with N and O. Its characteristic is that it is a three-dimensional porous carbon with a multi-level pore structure, and at the same time it is an interconnected three-dimensional structure, containing a large number of micropores and a small number of mesopores, and the size of the micropores is less than 3 nm. The present application utilizes the porous structure of the egg-box-shaped three-dimensional carbon material, and the structural characteristics that the micropores are interconnected. Aluminum hydroxide itself is an amphoteric compound, and aluminum hydroxide is generated in the micropores of the egg-box-shaped three-dimensional carbon material. When the flash-spun fabric is subjected to stress, the egg-box-shaped three-dimensional carbon material that adsorbs aluminum hydroxide acts as a buffer between the fiber gaps of the flash-spun fabric, reducing its local stress, which is beneficial to reducing its hygroscopic expansion rate. Since the egg-box-shaped three-dimensional carbon material that adsorbs aluminum hydroxide is added between the fiber gaps of the flash-spun fabric, its surface roughness can be improved, which is beneficial to the subsequent printing process. The team led by He Xiaojun from Anhui University of Technology and the team led by Qiu Jieshan from Beijing University of Chemical Technology used coal tar pitch rich in aromatic ring compounds as the carbon source and carbon cloth as the matrix, and prepared this N and O co-doped egg-box-shaped three-dimensional carbon material based on the in-situ activation method of K2CO3.

[0042] The spinning solvent is aromatic hydrocarbons, aliphatic hydrocarbons, alicyclic hydrocarbons, unsaturated hydrocarbons, halogenated hydrocarbons, alcohols, esters, ethers, ketones, nitriles, amides, fluorocarbons, sulfur dioxide, carbon disulfide, nitromethane, water, and a mixture of one or more of the above substances;

[0043] As a preferred technical solution, the spinning solvent is a mixture of dichloromethane, 1,1-dichloro-1-chloroethane, 1,1,1,3,3-pentafluorobutane, and 1H-perfluoroheptane, with a mass ratio of the four being 6:2:1:1.

[0044] Step 2: Processing of Flashspun Fabric:

[0045] like Figure 1 As shown, the spinning solution obtained in step 1 is flash-spun in a spinning manifold 1 at a spinning temperature of 190-230° C. Flash-spun fibers 17 are ejected from a spinneret 2. Spinning baffles 3 are provided on both sides of the flash-spun fibers 17. A pipe 4 is provided at the upper end of the spinning manifold 1 to connect with a self-circulating wind box 5. The self-circulating wind box 5 is provided with a fan 6. A first partition 7, a second partition 8, a third partition 9, and a damping plate 10 are sequentially provided on the left side of the self-circulating wind box.

[0046] The first air outlet duct 14 passes through the spinning baffle to guide the self-circulating gas to cool the flash-spun fiber 17, and the speed V1 is controlled by the first wind speed pump 11;

[0047] The second air outlet duct 15 passes through the spinning baffle to guide the self-circulating gas to cool the flash-spun fiber 17, and the speed V2 is controlled by the second wind speed pump 12;

[0048] The third air outlet duct 16 passes through the spinning baffle to guide the self-circulating gas to cool the flash-spun fiber 17, and the speed V3 is controlled by the third wind speed pump 13;

[0049] The flash-spun fiber is cooled in layers using self-circulating airflow, then laid out and hot-pressed to obtain the flash-spun fabric.

[0050] The self-circulating gas uses the gas generated during the spinning process, and its main component is the spinning solvent;

[0051] Rollers are used in the hot pressing process, and the Rockwell hardness of the hot rollers is 55HRC to 65HRC.

[0052] The greater the Rockwell hardness of the roller, the smaller the compression ratio and the smaller the hygroscopic expansion rate.

[0053] The wind speed V1 of the self-circulating airflow is 2 to 5 m / s, and the distance H1 between the air outlet of the self-circulating airflow and the spinneret is 8 to 15 cm.

[0054] The reason why nitrogen cannot be used: Nitrogen cannot be condensed, which will affect the treatment of exhaust gas.

[0055] The reason why air cannot be used: because it contains oxygen, there is a risk of explosion.

[0056] When V1 is too low, the wind speed is low, the blowing effect is not obvious, the cooling effect is not achieved, the filament bundles are relatively concentrated, resulting in uneven distribution of the non-woven fabric.

[0057] When V1 is too high, strong wind blowing may cause some broken filaments or even floating filaments, resulting in discontinuous production. Finally, the non-woven fabric may become partially super thin or even unevenly distributed.

[0058] When H1 is too small, the spinneret is too close to the air outlet, generating strong blowing, which causes some filament breakage and even floating filaments, resulting in inability to produce continuously.

[0059] When H1 is too high, the spinneret is far away from the air outlet, the air blowing cooling effect is not obvious, and the cooling effect is not achieved, resulting in uneven distribution of the non-woven fabric.

[0060] H1, H2, H3 gradually decrease in steps, while the wind speed increases in steps (i.e. the speed of the first air outlet duct is V1, the second air outlet duct is V1, the third air outlet duct is V3).

[0061] H2=0.85~0.95H1; H3=0.65~0.75H1;

[0062] V2=1.1~1.2V1; V3=1.4~1.5V1;

[0063] This application also provides another technical route:

[0064] A PE-PP composite flash-spun fabric with low compression ratio work. The polymer raw materials include a mixture of polyethylene, polypropylene, and a modified inorganic compound, wherein the mass fraction of polypropylene in the polymer raw materials is 10-15%; the mass fraction of the modified inorganic compound in the polymer raw materials is 1.25-2.25%. The processing steps are the same as above.

[0065] Example 1

[0066] This embodiment provides a method for processing a flash-spun fabric with a low compression ratio, which comprises the following steps:

[0067] Step 1: Processing of spinning solution:

[0068] dissolving the polymer raw material in a spinning solvent to obtain a spinning solution;

[0069] The mass fraction of polymer raw materials in the spinning solution is 10%;

[0070] The polymer raw materials are polyethylene and modified inorganic substances;

[0071] The mass fraction of modified inorganic matter in the polymer raw material is 1.25%;

[0072] A processing method for modified inorganic substances: the specific steps are:

[0073] The egg-box-shaped three-dimensional carbon material is dispersed in a sodium hydroxide solution for 4 hours, and then an aluminum chloride solution is slowly added to the system at a reaction temperature of 40°C and a stirring speed of 1600 rpm. After the aluminum chloride solution is added within 2 hours, the reaction temperature is raised to 85-95°C and the reaction is continued for 2 hours to allow aluminum ions to be adsorbed in the micropores of the egg-box-shaped three-dimensional carbon material, thereby generating aluminum hydroxide in the micropores of the egg-box-shaped three-dimensional carbon material. The reaction solution is then subjected to high-speed centrifugation at 5000 rpm for 1 hour, and the bottom precipitate after centrifugation is collected. The precipitate is vacuum-heated and dried to obtain an egg-box-shaped three-dimensional carbon material modification having aluminum hydroxide adsorbed on its surface and in its micropores.

[0074] The mass fraction of the egg-box-shaped three-dimensional carbon material in the sodium hydroxide solution is 30%;

[0075] The mass ratio of aluminum chloride in the aluminum chloride solution to the egg-box-shaped three-dimensional carbon material is 1:8;

[0076] As a preferred technical solution, the spinning solvent is a mixture of dichloromethane, 1,1-dichloro-1-chloroethane, 1,1,1,3,3-pentafluorobutane, and 1H-perfluoroheptane, with a mass ratio of the four being 6:2:1:1.

[0077] Step 2: Processing of Flashspun Fabric:

[0078] like Figure 1 As shown, the spinning solution obtained in step 1 is flash-spun in a spinning manifold 1 at a spinning temperature of 200° C. Flash-spun fibers 17 are ejected from a spinneret 2. Spinning baffles 3 are provided on both sides of the flash-spun fibers 17. A pipe 4 is provided at the upper end of the spinning manifold 1 to connect with a self-circulating wind box 5. The self-circulating wind box 5 is provided with a fan 6. A first partition 7, a second partition 8, a third partition 9, and a damping plate 10 are sequentially provided on the left side of the self-circulating wind box.

[0079] The first air outlet duct 14 passes through the spinning baffle to guide the self-circulating gas to cool the flash-spun fiber 17, and the speed V1 is controlled by the first wind speed pump 11;

[0080] The second air outlet duct 15 passes through the spinning baffle to guide the self-circulating gas to cool the flash-spun fiber 17, and the speed V2 is controlled by the second wind speed pump 12;

[0081] The third air outlet duct 16 passes through the spinning baffle to guide the self-circulating gas to cool the flash-spun fiber 17, and the speed V3 is controlled by the third wind speed pump 13;

[0082] The flash-spun fiber is cooled in layers using self-circulating airflow, then laid out and hot-pressed to obtain the flash-spun fabric.

[0083] Rollers are used in the hot pressing process, and the Rockwell hardness of the hot roller is 55HRC.

[0084] The wind speed V1 of the self-circulating airflow is 2 m / s, and the distance H1 between the air outlet of the self-circulating airflow and the spinneret is 8 cm.

[0085] H1, H2, H3 gradually decrease in steps, while the wind speed increases in steps (i.e. the speed of the first air outlet duct is V1, the second air outlet duct is V1, the third air outlet duct is V3).

[0086] H2=0.855H1; H3=0.655H1;

[0087] V2=1.1V1; V3=1.4V1.

[0088] The test results of this embodiment 1 are shown in Table 1.

[0089] Example 2

[0090] This embodiment provides a method for processing a flash-spun fabric with a low compression ratio, which comprises the following steps:

[0091] Step 1: Processing of spinning solution:

[0092] dissolving the polymer raw material in a spinning solvent to obtain a spinning solution;

[0093] The mass fraction of polymer raw materials in the spinning solution is 11%;

[0094] The polymer raw materials are polyethylene and modified inorganic substances;

[0095] The mass fraction of modified inorganic matter in the polymer raw material is 1.75%;

[0096] A processing method for modified inorganic substances: the specific steps are:

[0097] The egg-box-shaped three-dimensional carbon material is dispersed in a sodium hydroxide solution for 4.5 hours, and then an aluminum chloride solution is slowly added to the system at a reaction temperature of 53°C and a stirring speed of 1800 rpm. After the aluminum chloride solution is added within 2.25 hours, the reaction temperature is raised to 90°C and the reaction is continued for 2.5 hours to allow aluminum ions to be adsorbed in the micropores of the egg-box-shaped three-dimensional carbon material, thereby generating aluminum hydroxide in the micropores of the egg-box-shaped three-dimensional carbon material. The reaction solution is then subjected to high-speed centrifugation at 5250 rpm for 1.25 hours, and the bottom precipitate after centrifugation is collected. The precipitate is vacuum-heated and dried to obtain an egg-box-shaped three-dimensional carbon material modification having aluminum hydroxide adsorbed on its surface and in its micropores.

[0098] The mass fraction of the egg-box-shaped three-dimensional carbon material in the sodium hydroxide solution is 33%;

[0099] The mass ratio of aluminum chloride in the aluminum chloride solution to the egg-box-shaped three-dimensional carbon material is 1:9;

[0100] As a preferred technical solution, the spinning solvent is a mixture of dichloromethane, 1,1-dichloro-1-chloroethane, 1,1,1,3,3-pentafluorobutane, and 1H-perfluoroheptane, with a mass ratio of the four being 6:2:1:1.

[0101] Step 2: Processing of Flashspun Fabric:

[0102] like Figure 1 As shown, the spinning solution obtained in step 1 is flash-spun in a spinning manifold 1 at a spinning temperature of 210° C. Flash-spun fibers 17 are ejected from a spinneret 2. Spinning baffles 3 are provided on both sides of the flash-spun fibers 17. A pipe 4 is provided at the upper end of the spinning manifold 1 to connect with a self-circulating wind box 5. The self-circulating wind box 5 is provided with a fan 6. A first partition 7, a second partition 8, a third partition 9, and a damping plate 10 are sequentially provided on the left side of the self-circulating wind box.

[0103] The first air outlet duct 14 passes through the spinning baffle to guide the self-circulating gas to cool the flash-spun fiber 17, and the speed V1 is controlled by the first wind speed pump 11;

[0104] The second air outlet duct 15 passes through the spinning baffle to guide the self-circulating gas to cool the flash-spun fiber 17, and the speed V2 is controlled by the second wind speed pump 12;

[0105] The third air outlet duct 16 passes through the spinning baffle to guide the self-circulating gas to cool the flash-spun fiber 17, and the speed V3 is controlled by the third wind speed pump 13;

[0106] The flash-spun fiber is cooled in layers using self-circulating airflow, then laid out and hot-pressed to obtain the flash-spun fabric.

[0107] Rollers are used in the hot pressing process, and the Rockwell hardness of the hot roller is 60HRC.

[0108] The wind speed V1 of the self-circulating airflow is 4 m / s, and the distance H1 between the air outlet of the self-circulating airflow and the spinneret is 12 cm.

[0109] H1, H2, H3 gradually decrease in steps, while the wind speed increases in steps (i.e. the speed of the first air outlet duct is V1, the second air outlet duct is V1, the third air outlet duct is V3).

[0110] H2=0.9H1; H3=0.7H1;

[0111] V2=1.15V1; V3=1.45V1.

[0112] The test results of this embodiment 2 are shown in Table 1.

[0113] Example 3

[0114] This embodiment provides a method for processing a flash-spun fabric with a low compression ratio, which comprises the following steps:

[0115] Step 1: Processing of spinning solution:

[0116] dissolving the polymer raw material in a spinning solvent to obtain a spinning solution;

[0117] The mass fraction of polymer raw materials in the spinning solution is 13%;

[0118] The polymer raw materials are polyethylene and modified inorganic substances;

[0119] The mass fraction of modified inorganic matter in the polymer raw material is 2.25%;

[0120] A processing method for modified inorganic substances: the specific steps are:

[0121] The egg-box-shaped three-dimensional carbon material is dispersed in a sodium hydroxide solution for 5 hours, and then an aluminum chloride solution is slowly added to the system at a reaction temperature of 65°C and a stirring speed of 2000 rpm. After the aluminum chloride solution is added within 2.5 hours, the reaction temperature is raised to 95°C and the reaction is continued for 3 hours to allow aluminum ions to be adsorbed in the micropores of the egg-box-shaped three-dimensional carbon material, thereby generating aluminum hydroxide in the micropores of the egg-box-shaped three-dimensional carbon material. The reaction solution is then subjected to high-speed centrifugation at 5500 rpm for 1.5 hours, and the bottom precipitate after centrifugation is collected. The precipitate is vacuum-heated and dried to obtain an egg-box-shaped three-dimensional carbon material modification having aluminum hydroxide adsorbed on its surface and in its micropores.

[0122] The mass fraction of the egg-box-shaped three-dimensional carbon material in the sodium hydroxide solution is 35%;

[0123] The mass ratio of aluminum chloride in the aluminum chloride solution to the egg-box-shaped three-dimensional carbon material is 1:10;

[0124] The spinning solvent is a mixture of dichloromethane, 1,1-dichloro-1-chloroethane, 1,1,1,3,3-pentafluorobutane, and 1H-perfluoroheptane, with a mass ratio of 6:2:1:1.

[0125] Step 2: Processing of Flashspun Fabric:

[0126] like Figure 1 As shown, the spinning solution obtained in step 1 is flash-spun in a spinning manifold 1 at a spinning temperature of 230° C. Flash-spun fibers 17 are ejected from a spinneret 2. Spinning baffles 3 are provided on both sides of the flash-spun fibers 17. A pipe 4 is provided at the upper end of the spinning manifold 1 to connect with a self-circulating wind box 5. The self-circulating wind box 5 is provided with a fan 6. A first partition 7, a second partition 8, a third partition 9, and a damping plate 10 are sequentially provided on the left side of the self-circulating wind box.

[0127] The first air outlet duct 14 passes through the spinning baffle to guide the self-circulating gas to cool the flash-spun fiber 17, and the speed V1 is controlled by the first wind speed pump 11;

[0128] The second air outlet duct 15 passes through the spinning baffle to guide the self-circulating gas to cool the flash-spun fiber 17, and the speed V2 is controlled by the second wind speed pump 12;

[0129] The third air outlet duct 16 passes through the spinning baffle to guide the self-circulating gas to cool the flash-spun fiber 17, and the speed V3 is controlled by the third wind speed pump 13;

[0130] The flash-spun fiber is cooled in layers using self-circulating airflow, then laid out and hot-pressed to obtain the flash-spun fabric.

[0131] Rollers are used in the hot pressing process, and the Rockwell hardness of the hot rollers is 55HRC to 65HRC.

[0132] The wind speed V1 of the self-circulating airflow is 5 m / s, and the distance H1 between the air outlet of the self-circulating airflow and the spinneret is 15 cm.

[0133] H1, H2, H3 gradually decrease in steps, while the wind speed increases in steps (i.e. the speed of the first air outlet duct is V1, the second air outlet duct is V1, the third air outlet duct is V3).

[0134] H2=0.95H1; H3=0.75H1;

[0135] V2=1.2V1; V3=1.5V1.

[0136] The test results of this embodiment 3 are shown in Table 1.

[0137] Comparative Example 1

[0138] This comparative example provides a method for processing a flash-spun fabric with a low compression ratio, which comprises the following steps:

[0139] Step 1: Processing of spinning solution:

[0140] dissolving the polymer raw material in a spinning solvent to obtain a spinning solution;

[0141] The mass fraction of polymer raw materials in the spinning solution is 11%;

[0142] The polymer raw materials are polyethylene and modified inorganic substances;

[0143] The mass fraction of modified inorganic matter in the polymer raw material is 1.75%;

[0144] A processing method for modified inorganic substances: the specific steps are:

[0145] The aluminum hydroxide and the egg-box-shaped three-dimensional carbon material are mixed, wherein the mass ratio of the aluminum hydroxide to the egg-box-shaped three-dimensional carbon material is 0.6:9;

[0146] The spinning solvent is a mixture of dichloromethane, 1,1-dichloro-1-chloroethane, 1,1,1,3,3-pentafluorobutane, and 1H-perfluoroheptane, with a mass ratio of 6:2:1:1.

[0147] Step 2: Processing of Flashspun Fabric:

[0148] like Figure 1As shown, the spinning solution obtained in step 1 is flash-spun in a spinning manifold 1 at a spinning temperature of 210° C. Flash-spun fibers 17 are ejected from a spinneret 2. Spinning baffles 3 are provided on both sides of the flash-spun fibers 17. A pipe 4 is provided at the upper end of the spinning manifold 1 to connect with a self-circulating wind box 5. The self-circulating wind box 5 is provided with a fan 6. A first partition 7, a second partition 8, a third partition 9, and a damping plate 10 are sequentially provided on the left side of the self-circulating wind box.

[0149] The first air outlet duct 14 passes through the spinning baffle to guide the self-circulating gas to cool the flash-spun fiber 17, and the speed V1 is controlled by the first wind speed pump 11;

[0150] The second air outlet duct 15 passes through the spinning baffle to guide the self-circulating gas to cool the flash-spun fiber 17, and the speed V2 is controlled by the second wind speed pump 12;

[0151] The third air outlet duct 16 passes through the spinning baffle to guide the self-circulating gas to cool the flash-spun fiber 17, and the speed V3 is controlled by the third wind speed pump 13;

[0152] The flash-spun fiber is cooled in layers using self-circulating airflow, then laid out and hot-pressed to obtain the flash-spun fabric.

[0153] Rollers are used in the hot pressing process, and the Rockwell hardness of the hot roller is 60HRC.

[0154] The wind speed V1 of the self-circulating airflow is 4 m / s, and the distance H1 between the air outlet of the self-circulating airflow and the spinneret is 12 cm.

[0155] H1, H2, H3 gradually decrease in steps, while the wind speed increases in steps (i.e. the speed of the first air outlet duct is V1, the second air outlet duct is V1, the third air outlet duct is V3).

[0156] H2=0.9H1; H3=0.7H1;

[0157] V2=1.15V1; V3=1.45V1.

[0158] The test results of this comparative example 1 are shown in Table 1.

[0159] Comparative Example 2

[0160] This comparative example provides a method for processing a flash-spun fabric with a low compression ratio, which comprises the following steps:

[0161] Step 1: Processing of spinning solution:

[0162] dissolving the polymer raw material in a spinning solvent to obtain a spinning solution;

[0163] The mass fraction of polymer raw materials in the spinning solution is 11%;

[0164] The polymer raw materials are polyethylene and modified inorganic substances;

[0165] The mass fraction of modified inorganic matter in the polymer raw material is 0.75%;

[0166] A processing method for modified inorganic matter: the specific steps are the same as those in Example 2;

[0167] Step 2: Processing of flash spun fabric: the specific steps are the same as those in Example 2;

[0168] The test results of this comparative example 2 are shown in Table 1.

[0169] Comparative Example 3

[0170] This comparative example provides a method for processing a flash-spun fabric with a low compression ratio, which comprises the following steps:

[0171] Step 1: Processing of spinning solution:

[0172] dissolving the polymer raw material in a spinning solvent to obtain a spinning solution;

[0173] The mass fraction of polymer raw materials in the spinning solution is 11%;

[0174] The polymer raw materials are polyethylene and modified inorganic substances;

[0175] The mass fraction of modified inorganic matter in the polymer raw material is 1%;

[0176] A processing method for modified inorganic matter: the specific steps are the same as those in Example 2;

[0177] Step 2: Processing of flash spun fabric: the specific steps are the same as those in Example 2;

[0178] The test results of this comparative example 3 are shown in Table 1.

[0179] Comparative Example 4

[0180] This comparative example provides a method for processing a flash-spun fabric with a low compression ratio, which comprises the following steps:

[0181] Step 1: Processing of spinning solution:

[0182] dissolving the polymer raw material in a spinning solvent to obtain a spinning solution;

[0183] The mass fraction of polymer raw materials in the spinning solution is 11%;

[0184] The polymer raw materials are polyethylene and modified inorganic substances;

[0185] The mass fraction of modified inorganic matter in the polymer raw material is 2.75%;

[0186] A processing method for modified inorganic matter: the specific steps are the same as those in Example 2;

[0187] Step 2: Processing of flash spun fabric: the specific steps are the same as those in Example 2;

[0188] The test results of this comparative example 4 are shown in Table 1.

[0189] Comparative Example 5

[0190] This comparative example provides a method for processing a flash-spun fabric with a low compression ratio, which comprises the following steps:

[0191] Step 1: Processing of spinning solution:

[0192] dissolving the polymer raw material in a spinning solvent to obtain a spinning solution;

[0193] The mass fraction of polymer raw materials in the spinning solution is 11%;

[0194] The polymer raw materials are polyethylene and modified inorganic substances;

[0195] The mass fraction of modified inorganic matter in the polymer raw material is 3.00%;

[0196] A processing method for modified inorganic matter: the specific steps are the same as those in Example 2;

[0197] Step 2: Processing of flash spun fabric: the specific steps are the same as those in Example 2;

[0198] The test results of this comparative example 5 are shown in Table 1.

[0199] Comparative Example 6

[0200] This comparative example provides a method for processing a flash-spun fabric with a low compression ratio, which comprises the following steps:

[0201] Step 1: Processing of spinning solution:

[0202] dissolving the polymer raw material in a spinning solvent to obtain a spinning solution;

[0203] The mass fraction of polymer raw materials in the spinning solution is 11%;

[0204] The polymer raw materials are polyethylene and modified inorganic substances;

[0205] The mass fraction of modified inorganic matter in the polymer raw material is 1.75%;

[0206] A processing method for modified inorganic matter: the specific steps are the same as those in Example 2;

[0207] Step 2: Processing of Flashspun Fabric:

[0208] like Figure 1As shown, the spinning solution obtained in step 1 is flash-spun in a spinning manifold 1 at a spinning temperature of 210° C. Flash-spun fibers 17 are ejected from a spinneret 2. Spinning baffles 3 are provided on both sides of the flash-spun fibers 17. A pipe 4 is provided at the upper end of the spinning manifold 1 to connect with a self-circulating wind box 5. The self-circulating wind box 5 is provided with a fan 6. A first partition 7, a second partition 8, a third partition 9, and a damping plate 10 are sequentially provided on the left side of the self-circulating wind box.

[0209] The first air outlet duct 14 passes through the spinning baffle to guide the self-circulating gas to cool the flash-spun fiber 17, and the speed V1 is controlled by the first wind speed pump 11;

[0210] The second air outlet duct 15 passes through the spinning baffle to guide the self-circulating gas to cool the flash-spun fiber 17, and the speed V2 is controlled by the second wind speed pump 12;

[0211] The third air outlet duct 16 passes through the spinning baffle to guide the self-circulating gas to cool the flash-spun fiber 17, and the speed V3 is controlled by the third wind speed pump 13;

[0212] The flash-spun fiber is cooled in layers using self-circulating airflow, then laid out and hot-pressed to obtain the flash-spun fabric.

[0213] Rollers are used in the hot pressing process, and the Rockwell hardness of the hot roller is 60HRC.

[0214] The wind speed V1 of the self-circulating airflow is 4 m / s, and the distance H1 between the air outlet of the self-circulating airflow and the spinneret is 12 cm.

[0215] H2=H1; H3=H1;

[0216] V2=V1; V3=V1.

[0217] The test results of this comparative example 6 are shown in Table 1.

[0218] Comparative Example 7

[0219] This comparative example provides a method for processing a flash-spun fabric with a low compression ratio, which comprises the following steps:

[0220] Step 1: Processing of spinning solution:

[0221] dissolving the polymer raw material in a spinning solvent to obtain a spinning solution;

[0222] The mass fraction of polymer raw materials in the spinning solution is 11%;

[0223] The polymer raw materials are polyethylene and modified inorganic substances;

[0224] The mass fraction of modified inorganic matter in the polymer raw material is 1.75%;

[0225] A processing method for modified inorganic matter: the specific steps are the same as those in Example 2;

[0226] As a preferred technical solution, the spinning solvent is a mixture of dichloromethane, 1,1-dichloro-1-chloroethane, 1,1,1,3,3-pentafluorobutane, and 1H-perfluoroheptane, with a mass ratio of the four being 6:2:1:1.

[0227] Step 2: Processing of Flashspun Fabric:

[0228] like Figure 1 As shown, the spinning solution obtained in step 1 is flash-spun in a spinning manifold 1 at a spinning temperature of 210° C. Flash-spun fibers 17 are ejected from a spinneret 2. Spinning baffles 3 are provided on both sides of the flash-spun fibers 17. A pipe 4 is provided at the upper end of the spinning manifold 1 to connect with a self-circulating wind box 5. The self-circulating wind box 5 is provided with a fan 6. A first partition 7, a second partition 8, a third partition 9, and a damping plate 10 are sequentially provided on the left side of the self-circulating wind box.

[0229] The first air outlet duct 14 passes through the spinning baffle to guide the self-circulating gas to cool the flash-spun fiber 17, and the speed V1 is controlled by the first wind speed pump 11;

[0230] The second air outlet duct 15 passes through the spinning baffle to guide the self-circulating gas to cool the flash-spun fiber 17, and the speed V2 is controlled by the second wind speed pump 12;

[0231] The third air outlet duct 16 passes through the spinning baffle to guide the self-circulating gas to cool the flash-spun fiber 17, and the speed V3 is controlled by the third wind speed pump 13;

[0232] The flash-spun fiber is cooled in layers using self-circulating airflow, then laid out and hot-pressed to obtain the flash-spun fabric.

[0233] Rollers are used in the hot pressing process, and the Rockwell hardness of the hot roller is 60HRC.

[0234] The wind speed V1 of the self-circulating airflow is 0.5 m / s, and the distance H1 between the air outlet of the self-circulating airflow and the spinneret is 12 cm.

[0235] H1, H2, H3 gradually decrease in steps, while the wind speed increases in steps (i.e. the speed of the first air outlet duct is V1, the second air outlet duct is V1, the third air outlet duct is V3).

[0236] H2=0.9H1; H3=0.7H1;

[0237] V2=1.15V1; V3=1.45V1.

[0238] The test results of this comparative example 7 are shown in Table 1.

[0239] Comparative Example 8

[0240] This comparative example provides a method for processing a flash-spun fabric with a low compression ratio, which comprises the following steps:

[0241] Step 1: Processing of spinning solution:

[0242] dissolving the polymer raw material in a spinning solvent to obtain a spinning solution;

[0243] The mass fraction of polymer raw materials in the spinning solution is 11%;

[0244] The polymer raw materials are polyethylene and modified inorganic substances;

[0245] The mass fraction of modified inorganic matter in the polymer raw material is 1.75%;

[0246] A processing method for modified inorganic matter: the specific steps are the same as those in Example 2;

[0247] As a preferred technical solution, the spinning solvent is a mixture of dichloromethane, 1,1-dichloro-1-chloroethane, 1,1,1,3,3-pentafluorobutane, and 1H-perfluoroheptane, with a mass ratio of the four being 6:2:1:1.

[0248] Step 2: Processing of Flashspun Fabric:

[0249] like Figure 1 As shown, the spinning solution obtained in step 1 is flash-spun in a spinning manifold 1 at a spinning temperature of 210° C. Flash-spun fibers 17 are ejected from a spinneret 2. Spinning baffles 3 are provided on both sides of the flash-spun fibers 17. A pipe 4 is provided at the upper end of the spinning manifold 1 to connect with a self-circulating wind box 5. The self-circulating wind box 5 is provided with a fan 6. A first partition 7, a second partition 8, a third partition 9, and a damping plate 10 are sequentially provided on the left side of the self-circulating wind box.

[0250] The first air outlet duct 14 passes through the spinning baffle to guide the self-circulating gas to cool the flash-spun fiber 17, and the speed V1 is controlled by the first wind speed pump 11;

[0251] The second air outlet duct 15 passes through the spinning baffle to guide the self-circulating gas to cool the flash-spun fiber 17, and the speed V2 is controlled by the second wind speed pump 12;

[0252] The third air outlet duct 16 passes through the spinning baffle to guide the self-circulating gas to cool the flash-spun fiber 17, and the speed V3 is controlled by the third wind speed pump 13;

[0253] The flash-spun fiber is cooled in layers using self-circulating airflow, then laid out and hot-pressed to obtain the flash-spun fabric.

[0254] Rollers are used in the hot pressing process, and the Rockwell hardness of the hot roller is 60HRC.

[0255] The wind speed V1 of the self-circulating airflow is 7 m / s, and the distance H1 between the air outlet of the self-circulating airflow and the spinneret is 12 cm.

[0256] H1, H2, H3 gradually decrease in steps, while the wind speed increases in steps (i.e. the speed of the first air outlet duct is V1, the second air outlet duct is V1, the third air outlet duct is V3).

[0257] H2=0.9H1; H3=0.7H1;

[0258] V2=1.15V1; V3=1.45V1.

[0259] The spinneret of this application was too close to the air outlet, which generated strong airflow, causing some broken filaments and even floating filaments, resulting in the inability to produce continuous production. No more samples were tested.

[0260] Comparative Example 9

[0261] This comparative example provides a method for processing a flash-spun fabric with a low compression ratio, which comprises the following steps:

[0262] Step 1: Processing of spinning solution:

[0263] dissolving the polymer raw material in a spinning solvent to obtain a spinning solution;

[0264] The mass fraction of polymer raw materials in the spinning solution is 11%;

[0265] The polymer raw materials are polyethylene and modified inorganic substances;

[0266] The mass fraction of modified inorganic matter in the polymer raw material is 1.75%;

[0267] A processing method for modified inorganic matter: the specific steps are the same as those in Example 2;

[0268] The spinning solvent is a mixture of dichloromethane, 1,1-dichloro-1-chloroethane, 1,1,1,3,3-pentafluorobutane, and 1H-perfluoroheptane, with a mass ratio of 6:2:1:1.

[0269] Step 2: Processing of Flashspun Fabric:

[0270] like Figure 1As shown, the spinning solution obtained in step 1 is flash-spun in a spinning manifold 1 at a spinning temperature of 210° C. Flash-spun fibers 17 are ejected from a spinneret 2. Spinning baffles 3 are provided on both sides of the flash-spun fibers 17. A pipe 4 is provided at the upper end of the spinning manifold 1 to connect with a self-circulating wind box 5. The self-circulating wind box 5 is provided with a fan 6. A first partition 7, a second partition 8, a third partition 9, and a damping plate 10 are sequentially provided on the left side of the self-circulating wind box.

[0271] The first air outlet duct 14 passes through the spinning baffle to guide the self-circulating gas to cool the flash-spun fiber 17, and the speed V1 is controlled by the first wind speed pump 11;

[0272] The second air outlet duct 15 passes through the spinning baffle to guide the self-circulating gas to cool the flash-spun fiber 17, and the speed V2 is controlled by the second wind speed pump 12;

[0273] The third air outlet duct 16 passes through the spinning baffle to guide the self-circulating gas to cool the flash-spun fiber 17, and the speed V3 is controlled by the third wind speed pump 13;

[0274] The flash-spun fiber is cooled in layers using self-circulating airflow, then laid out and hot-pressed to obtain the flash-spun fabric.

[0275] Rollers are used in the hot pressing process, and the Rockwell hardness of the hot roller is 60HRC.

[0276] The wind speed V1 of the self-circulating airflow is 4 m / s, and the distance H1 between the air outlet of the self-circulating airflow and the spinneret is 4 cm.

[0277] H1, H2, H3 gradually decrease in steps, while the wind speed increases in steps (i.e. the speed of the first air outlet duct is V1, the second air outlet duct is V1, the third air outlet duct is V3).

[0278] H2=0.9H1; H3=0.7H1;

[0279] V2=1.15V1; V3=1.45V1.

[0280] The spinneret of this application was too close to the air outlet, which generated strong airflow, causing some broken filaments and even floating filaments, resulting in the inability to produce continuous production. No more samples were tested.

[0281] Comparative Example 10

[0282] This comparative example provides a method for processing a flash-spun fabric with a low compression ratio, which comprises the following steps:

[0283] Step 1: Processing of spinning solution:

[0284] dissolving the polymer raw material in a spinning solvent to obtain a spinning solution;

[0285] The mass fraction of polymer raw materials in the spinning solution is 11%;

[0286] The polymer raw materials are polyethylene and modified inorganic substances;

[0287] The mass fraction of modified inorganic matter in the polymer raw material is 1.75%;

[0288] A processing method for modified inorganic matter: the specific steps are the same as those in Example 2;

[0289] The spinning solvent is a mixture of dichloromethane, 1,1-dichloro-1-chloroethane, 1,1,1,3,3-pentafluorobutane, and 1H-perfluoroheptane, with a mass ratio of 6:2:1:1.

[0290] Step 2: Processing of Flashspun Fabric:

[0291] like Figure 1 As shown, the spinning solution obtained in step 1 is flash-spun in a spinning manifold 1 at a spinning temperature of 210° C. Flash-spun fibers 17 are ejected from a spinneret 2. Spinning baffles 3 are provided on both sides of the flash-spun fibers 17. A pipe 4 is provided at the upper end of the spinning manifold 1 to connect with a self-circulating wind box 5. The self-circulating wind box 5 is provided with a fan 6. A first partition 7, a second partition 8, a third partition 9, and a damping plate 10 are sequentially provided on the left side of the self-circulating wind box.

[0292] The first air outlet duct 14 passes through the spinning baffle to guide the self-circulating gas to cool the flash-spun fiber 17, and the speed V1 is controlled by the first wind speed pump 11;

[0293] The second air outlet duct 15 passes through the spinning baffle to guide the self-circulating gas to cool the flash-spun fiber 17, and the speed V2 is controlled by the second wind speed pump 12;

[0294] The third air outlet duct 16 passes through the spinning baffle to guide the self-circulating gas to cool the flash-spun fiber 17, and the speed V3 is controlled by the third wind speed pump 13;

[0295] The flash-spun fiber is cooled in layers using self-circulating airflow, then laid out and hot-pressed to obtain the flash-spun fabric.

[0296] Rollers are used in the hot pressing process, and the Rockwell hardness of the hot roller is 60HRC.

[0297] The wind speed V1 of the self-circulating airflow is 4 m / s, and the distance H1 between the air outlet of the self-circulating airflow and the spinneret is 20 cm.

[0298] H1, H2, H3 gradually decrease in steps, while the wind speed increases in steps (i.e. the speed of the first air outlet duct is V1, the second air outlet duct is V1, the third air outlet duct is V3).

[0299] H2=0.9H1; H3=0.7H1;

[0300] V2=1.15V1; V3=1.45V1.

[0301] The test results of this comparative example 10 are shown in Table 1.

[0302] Example 4

[0303] This embodiment provides a method for processing a PE-PP composite flash-spun fabric with a low compression ratio, which comprises the following steps:

[0304] Step 1: Processing of spinning solution:

[0305] dissolving the polymer raw material in a spinning solvent to obtain a spinning solution;

[0306] The mass fraction of polymer raw materials in the spinning solution is 10%;

[0307] The polymer raw materials are polyethylene, polypropylene and modified inorganic substances; the mass fraction of polypropylene in the polymer raw materials is 10%; the mass fraction of the modified inorganic substances in the polymer raw materials is 1.25%;

[0308] The spinning solvent is a mixture of dichloromethane, 1,1-dichloro-1-chloroethane, 1,1,1,3,3-pentafluorobutane, and 1H-perfluoroheptane, with a mass ratio of 6:2:1:1.

[0309] A method for processing modified inorganic substances: the specific steps are the same as those in Example 1;

[0310] Step 2: Processing of flash-spun fabric: the specific steps are the same as those in Example 1;

[0311] The test results of this embodiment 4 are shown in Table 1.

[0312] Example 5

[0313] This embodiment provides a method for processing a PE-PP composite flash-spun fabric with a low compression ratio, which comprises the following steps:

[0314] Step 1: Processing of spinning solution:

[0315] dissolving the polymer raw material in a spinning solvent to obtain a spinning solution;

[0316] The mass fraction of polymer raw materials in the spinning solution is 11%;

[0317] The polymer raw materials are polyethylene, polypropylene and modified inorganic substances; the mass fraction of polypropylene in the polymer raw materials is 12.5%; the mass fraction of modified inorganic substances in the polymer raw materials is 1.75%;

[0318] The spinning solvent is a mixture of dichloromethane, 1,1-dichloro-1-chloroethane, 1,1,1,3,3-pentafluorobutane, and 1H-perfluoroheptane, with a mass ratio of 6:2:1:1.

[0319] A processing method for modified inorganic matter: the specific steps are the same as those in Example 2;

[0320] Step 2: Processing of flash spun fabric: the specific steps are the same as those in Example 2;

[0321] The test results of this embodiment 5 are shown in Table 1.

[0322] Example 6

[0323] This embodiment provides a method for processing a PE-PP composite flash-spun fabric with a low compression ratio, which comprises the following steps:

[0324] Step 1: Processing of spinning solution:

[0325] dissolving the polymer raw material in a spinning solvent to obtain a spinning solution;

[0326] The mass fraction of polymer raw materials in the spinning solution is 13%;

[0327] The polymer raw materials are polyethylene, polypropylene and modified inorganic substances; the mass fraction of polypropylene in the polymer raw materials is 15%; the mass fraction of the modified inorganic substances in the polymer raw materials is 2.25%;

[0328] The spinning solvent is a mixture of dichloromethane, 1,1-dichloro-1-chloroethane, 1,1,1,3,3-pentafluorobutane, and 1H-perfluoroheptane, with a mass ratio of 6:2:1:1.

[0329] A processing method for modified inorganic matter: the specific steps are the same as those in Example 3;

[0330] Step 2: Processing of flash-spun fabric: the specific steps are the same as those in Example 3;

[0331] The test results of this embodiment 6 are shown in Table 1.

[0332] Table 1

[0333]

[0334] Analysis of results: 1. From the experimental results of Examples 1-3 and Comparative Example 1, it can be seen that the egg-box-shaped three-dimensional carbon material is first dispersed in a sodium hydroxide solution and then mixed with aluminum chloride, and the inorganic modification method in which aluminum hydroxide is generated and adsorbed is compared with the modification method in which the material is directly mixed with aluminum hydroxide. The final product has better performance in terms of compression ratio and hygroscopic expansion rate.

[0335] 2. From the experimental results of Examples 1-3 and Comparative Examples 2-5, it can be seen that adding too much or too little modified inorganic material will affect the compression ratio and hygroscopic expansion rate. In particular, when the amount added is too much, although the hygroscopic expansion rate is reduced, the longitudinal / transverse ratio is below 0.5, which is an unbalanced ratio, and the surface roughness is also significantly increased, which is not an ideal material.

[0336] 3. From the experimental results of Examples 1-3 and Comparative Examples 6-7 and Comparative Example 10, it can be seen that the distance between the air outlet and the spinneret and the wind speed of the self-circulating airflow during the spinning process will also have a significant impact on the compression ratio and hygroscopic expansion rate of the final product.

[0337] 4. From the experimental results of Examples 1-3 and Examples 4-6, it can be seen that after using part of polypropylene in the polymer raw material, the obtained products can still roughly maintain a small compression work ratio and hygroscopic expansion rate.

[0338] The above is only a preferred embodiment of the present invention. It should be pointed out that ordinary technicians in this technical field can make several improvements and modifications without departing from the concept of the present invention. These improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A flash-spun fabric with low compression ratio, the raw material of which comprises polyethylene, The weight of flash spun fabric is 35g / m 2 above; The compression ratio of flash spun fabrics is greater than 0.08 gf·cm / cm 2 ; The hygroscopic expansion rate of flash-spun fabrics is 0.2% to 0.4% when the relative humidity is between 33% and 84%; The method for processing the above-mentioned flash-spun fabric with low compression ratio comprises the following steps: Step 1: Processing of spinning solution: dissolving the polymer raw material in a spinning solvent to obtain a spinning solution; The mass fraction of polymer raw materials in the spinning solution is 8-19%; The polymer raw materials include polyethylene and modified inorganic substances; The mass fraction of the modified inorganic substance in the polymer raw material is 1.25 to 2.25%; Step 2: Processing of Flashspun Fabric: The spinning solution obtained in step 1 is flash-spun in a spinning box (1) at a spinning temperature of 190 to 230° C., and flash-spun fibers (17) are ejected from a spinneret (2). Spinning baffles (3) are provided on both sides of the flash-spun fibers (17). A pipe (4) is provided at the upper end of the spinning box (1) and is connected to a self-circulating wind box (5). The self-circulating wind box (5) is provided with a fan (6). A first partition (7), a second partition (8), a third partition (9), and a damping plate (10) are sequentially provided on the left side of the self-circulating wind box. The first air outlet duct (14) passes through the spinning baffle to discharge the self-circulating gas to cool the flash-spun fibers (17), and the speed V1 is controlled by the first wind speed pump (11); The second air outlet duct (15) passes through the spinning baffle to discharge the self-circulating gas to cool the flash-spun fibers (17), and the speed V2 is controlled by the second wind speed pump (12); The third air outlet duct (16) passes through the spinning baffle to discharge the self-circulating gas to cool the flash-spun fibers (17), and the speed V3 is controlled by the third wind speed pump (13); The wind speed V1 of the self-circulating airflow is 2 to 5 m / s, and the distance H1 between the outlet of the self-circulating airflow and the spinneret is 8 to 15 cm; H2=0.85~0.95H1; H3=0.65~0.75H1; Wherein, H2 is the distance between the first air outlet duct (14) and the second air outlet duct (15), and H3 is the distance between the second air outlet duct (15) and the third air outlet duct (16); V2=1.1~1.2V1; V3=1.4~1.5V1; The modified inorganic material is an egg-box-shaped three-dimensional carbon material modified material, and is prepared by the following method: The egg-box-shaped three-dimensional carbon material is dispersed in a sodium hydroxide solution for 4 to 5 hours, and then an aluminum chloride solution is slowly added to the system at a reaction temperature of 40 to 65°C and a stirring speed of 1600 to 2000 rpm. After the aluminum chloride solution is added within 2 to 2.5 hours, the reaction temperature is increased to 85 to 95°C and the reaction is continued for 2 to 3 hours to allow aluminum ions to be adsorbed in the micropores of the egg-box-shaped three-dimensional carbon material, thereby generating aluminum hydroxide in the micropores of the egg-box-shaped three-dimensional carbon material. The reaction solution is then subjected to high-speed centrifugation at 5000 to 5500 rpm for 1 to 1.5 hours, and the bottom precipitate after centrifugation is collected. The precipitate is vacuum-heated and dried to obtain an egg-box-shaped three-dimensional carbon material modification.

2. A flash-spun fabric with low compression ratio according to claim 1, characterized in that: The weight of flash spun fabric is less than 60g / m 2 .

3. A flash-spun fabric with low compression ratio according to claim 1, characterized in that: The weight of flash spun fabric is less than 50g / m 2 .

4. A flash-spun fabric with low compression ratio according to claim 1, characterized in that: The compression ratio of flash spun fabrics is 0.08 to 0.15 gf·cm / cm 2 .

5. The flash-spun fabric with low compression ratio according to claim 1, characterized in that: The compression ratio of flash spun fabrics is 0.15 to 0.2 gf·cm / cm 2 .

6. The flash-spun fabric with low compression ratio according to claim 1, characterized in that: The compression ratio of flash spun fabrics is 0.2 to 0.3 gf·cm / cm 2 .

7. The flash-spun fabric with low compression ratio according to claim 1, characterized in that: The compression ratio of flash spun fabrics is 0.3 to 0.5 gf·cm / cm 2 .

8. The flash-spun fabric with low compression ratio according to claim 1, characterized in that: The hygroscopic expansion rate of vinyl non-woven fabric is 0.2% to 0.3% when the relative humidity is between 33% and 84%.

9. The flash-spun fabric with low compression ratio according to claim 1, characterized in that: The hygroscopic expansion rate of vinyl non-woven fabric is 0.3% to 0.4% when the relative humidity is between 33% and 84%.

10. The flash-spun fabric with low compression ratio according to claim 1, characterized in that: The ratio of the longitudinal hygroscopic expansion rate to the transverse hygroscopic expansion rate of the ethylene non-woven fabric is less than 1 when the relative humidity is between 33% and 84%.

11. The flash-spun fabric with low compression ratio according to claim 1, characterized in that: The ratio of the longitudinal hygroscopic expansion rate to the transverse hygroscopic expansion rate of the ethylene non-woven fabric when the relative humidity is between 33% and 84% is greater than 0.

5.

12. The flash-spun fabric with low compression ratio according to claim 1, characterized in that: When the relative humidity of the vinyl non-woven fabric is between 33% and 84%, the ratio of the longitudinal hygroscopic expansion rate to the transverse hygroscopic expansion rate is between 0.65 and 0.

85.

13. The flash-spun fabric with low compression ratio according to claim 1, characterized in that: The surface roughness of flash spun fabrics is 2 to 3.5 microns.

14. The flash-spun fabric with low compression ratio according to claim 1, characterized in that: The surface roughness of the flash-spun fabric is 2.6 to 3 microns.

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