Flash evaporation material with low haze decay rate

Abstract

The present invention relates to a method for manufacturing a flash spun nonwoven fabric, the raw material of which is polyethylene, and the basis weight of the flash spun nonwoven fabric is 35 g / m 2 The compression ratio P of the flash evaporation material is greater than 0.07 gf cm / cm. 2 The flash evaporation material has a low haze decay rate, and the compression ratio work is tested using a KES-style tester and FB3, the haze decay rate ΔW of the flash evaporation material is 0.3% to 1.5%, where ΔW = (W0 - W5) / W0 * 100%, and the heat insulation rate decay rate ΔS of the flash evaporation material is 7% to 15%, where ΔS = (S0 - S5) / S0 * 100%. This application utilizes modification of the spinning raw material to improve the performance of the flash evaporation material and expand its application range.

Description

[Technical Field]

[0001] The present invention is in the field of flash evaporation technology, and in particular relates to flash evaporation materials with low haze decay rates. [Background technology]

[0002] Flash evaporation spinning involves dissolving similar polymers, such as PE or PP, in a spinning solvent to form a spinning solution, which is then ejected through a spinning hole. The rapid evaporation of the solvent resolidifies the polymer into fibers, which are then absorbed into a web-forming curtain to directly form a fibrous web. The resulting flash material is then produced through a hot press and winding process. The current polymer raw material for flash evaporation is PE. Flash evaporation polyethylene nonwoven fabrics have many excellent properties, including excellent waterproofness and breathability. The sheet material has excellent strength, tear resistance, puncture resistance, and burst resistance. The sheet material is generally non-pilling and non-dusting, and has excellent performance over a wide temperature range. Therefore, flash evaporation polyethylene nonwoven fabrics are widely used in packaging, protective clothing, covers, and printing substrates.

[0003] Chinese Patent Publication No. CN114687057A relates to a flash evaporator sheet made from polyethylene and a modifier, characterized in that the bending length decay value ΔC is 0.1 to 0.4, ΔC=1-C2 / C1, where C1 is the bending length of the unaged flash evaporator sheet and C2 is the bending length of the aged flash evaporator sheet, and the bending length C2 of the aged flash evaporator sheet is 4 to 10 centimeters, and its applications. The flash evaporator sheet of this application maintains brightness while exhibiting low bending length decay, extending the service life of products and expanding the scope of applications.

[0004] Chinese Patent Publication No. CN114687069A relates to a multifunctional polymer nonwoven fabric, characterized in that its elongation at break decay rate ▲E is 0.20-0.50, ▲E=1-E2 / E1, where E1 is the elongation at break of the unaged multifunctional polymer nonwoven fabric and E2 is the elongation at break of the aged multifunctional polymer nonwoven fabric, and the value of E2 is less than 0.5. The process involved in this application is simple and has wide application.

[0005] Chinese Patent Publication No. CN114687068A relates to an improved flash evaporation nonwoven fabric. This invention addresses the problem of the prior art where flash evaporation nonwoven fabrics lose brightness over a period of use. The improved flash evaporation nonwoven fabric has a D65 fluorescence brightness loss factor (▲F) of 0.20 to 0.30, where ▲F=1-F2 / F1, where F1 is the D65 fluorescence brightness of the unaged nonwoven fabric and F2 is the D65 fluorescence brightness of the aged nonwoven fabric. The aging process conditions are an irradiance of 60±2 watts / m2 in the wavelength range of 300-400 nanometers, a black mark temperature of 65±2°C, a test room air temperature of 38±3°C, a relative humidity of 50±10%, and a drying time of 1440 hours. The flash evaporation nonwoven fabric of this invention maintains high brightness over a period of use.

[0006] Chinese Patent Publication No. CN114108112A relates to a polyethylene sheet having a tensile strength aging ratio (ΔS) of 0.10-0.30, ΔS=1-S2 / S1, where S1 is the tensile strength of the unaged nonwoven fabric in kN / m and S2 is the tensile strength of the aged nonwoven fabric in kN / m. The aging process conditions are an irradiance of 60±2 watts / m2 in the wavelength range of 300-400 nanometers, a black mark temperature of 65±2°C, a test room air temperature of 38±3°C, a relative humidity of 50±10%, and a drying time of 1440 hours. The product of this invention maintains good tensile strength even after aging, extending the service life of the product.

[0007] Chinese Patent Publication No. CN115537959A relates to a composite material, the raw material of which is polyethylene, characterized in that the shrinkage ratio R is 0.2-0.7, the standard heat shrinkage strength σr is 0.5-3.5 N / mm2, and the antifungal grade is less than grade 2. This application has good shrinkage performance and favorable antibacterial and antifungal effects, and is therefore widely used.

[0008] Chinese Patent Publication No. CN109154138A relates to a composite laminate, which is a composite material including a nonwoven vapor-permeable sheet, the composite laminate comprising at least one moisture vapor-permeable nonwoven sheet having a first and second surface, and a fluorinated polymer coating on the first surface of the sheet, wherein (i) the fluorinated polymer coating is present in an amount such that the total fluorine content of the coated nonwoven sheet is from 0.05 gsm to no more than 0.4 gsm, and (ii) the composite laminate exhibits a retained hydraulic head of at least 60% after exposure to wet wood.

[0009] U.S. Patent Publication No. US20160138197A1 discloses flash-spun plexifilament yarns and sheets with a BET surface area of ​​12 m 2 / g, wherein the fiber bundle comprises fibers formed primarily from polyethylene, the fibers have a total crystallinity index less than 55%, and the fiber bundle has a sheet with an elongation to break greater than 55%.

[0010] U.S. Patent Publication No. US8048513 relates to a flash-spun sheet and improved plexifilament sheet for use in protective clothing and filtration media, the material consisting of substantially continuous polyethylene plexifilament sheet fiber bundles and having a density of at least 2 cfm / ft normalized to 1.0 oz / yd. 2 It has a Fraser permeability of

[0011] In the prior art, there has been little research on the heat-shielding performance and haze performance of flash evaporation materials, and flash evaporation materials have the problem that their heat-shielding performance and haze performance decrease after a certain period of use. Summary of the Invention [Problem to be solved by the invention]

[0012] SUMMARY OF THE INVENTION An object of the present invention is to provide a flash evaporation material with a low haze decay rate in response to the above problems. [Means for solving the problem]

[0013] In order to achieve the above object, the present invention adopts the following technical solutions: A flash evaporation material with low haze decay rate, wherein the raw material of the flash evaporation material comprises polyethylene, and the basis weight of the flash spun nonwoven fabric is 35 g / m 2 is larger than The compression ratio P of the flash evaporation material is 0.07 gf cm / cm 2 is larger than Compression ratio work is tested by KES style tester, compression ratio work is tested by FB3, The haze decay rate △W of flash evaporation materials is 0.3% to 1.5%. △W=(W0-W5) / W0*100%, The attenuation rate △S of the heat insulation rate of flash evaporation material is 7% to 15%. △S=(S0-S5) / S0*100% The tests for heat insulation rate, haze and transverse tensile strength are as follows: (1) The sample is left under conditions of 25°C and 65% relative humidity for 24 hours, and then its shading index is measured and recorded as initial heat shielding rate S0, its haze is measured and recorded as initial haze W0, and its tensile strength in the transverse direction is measured and recorded as transverse tensile strength CTS0, (2) Then, after exposing it to a dry heat atmosphere at 90°C for 6 hours and then cooling it under conditions of 25°C and 65% relative humidity for 24 hours, (3) Repeat the operation of step (2) four more times, and then measure the shading index and record it as the final heat shielding rate S5, measure the haze and record it as the final haze W5, and measure the transverse tensile strength and record it as the final transverse tensile strength CTS5; Haze is tested according to the national standard GB / T2410-2008, A flash evaporation material with low haze decay rate, characterized in that the heat shielding rate is tested according to the national standard GB / T41560-2022 measurement.

[0014] Tensile strength is tested according to the national standard GB / T12914-2018, and the tensile strength is the maximum tension that a specimen per unit width can withstand before breaking under the specified test conditions.

[0015] The basis weight of flash-spun nonwoven fabric is 75 g / m 2 is smaller than.

[0016] The basis weight of flash-spun nonwoven fabric is 65 g / m 2 is smaller than.

[0017] The compression ratio P of flash-spun nonwoven fabric is 0.15 gf cm / cm 2 is greater than.

[0018] The compression ratio P of flash-spun nonwoven fabric is 2 gf cm / cm 2 is smaller than.

[0019] The compression ratio P of flash-spun nonwoven fabric is 1 gf cm / cm 2 is smaller than.

[0020] The haze decay rate ΔW of the flash evaporation material is 0.6% to 0.9%.

[0021] The haze decay rate ΔW of the flash evaporation material is 0.9% to 1.3%.

[0022] The thermal insulation rate of flash evaporation materials is reduced by 7% to 10%.

[0023] The thermal insulation rate of flash evaporation materials is reduced by 10% to 14%.

[0024] The transverse tensile strength decay rate (△CTS) of flash evaporated materials is 2% to 10%. △CTS=(CTS0-CTS5) / CTS0*100%, The transverse tensile strength CTS0 is greater than 1.4KN / m.

[0025] The transverse tensile strength decay rate △CTS of flash evaporated material is 3% to 5%.

[0026] The transverse tensile strength decay rate △CTS of flash evaporated material is 5% to 7%.

[0027] The transverse tensile strength decay rate △CTS of flash evaporated material is 7% to 9%.

[0028] A method for preparing a flash evaporation material with a low haze decay rate, the method comprising: preparing a spinning solution; and preparing a flash evaporation material; where: The spinning solution is prepared as follows: the spinning raw material is dissolved in a spinning solvent to obtain a spinning solution; The spinning raw material is a porous carbon material carrying polyethylene and zinc oxide, The mass fraction of the porous carbon material supporting zinc oxide in the spinning raw material is 3% to 6%; A method for preparing a porous carbon material loaded with zinc oxide, which comprises the following specific technical steps: (1) A step of preparing a solution in which the surface of silica nanoparticles is coated with polyvinyl alcohol, Silica nanoparticles are added to deionized water and ultrasonically dispersed to obtain a dispersion, and polyvinyl alcohol powder is added to the dispersion, and the mixture is stirred while being heated at the same time. The heating temperature is controlled to 80°C to 100°C to dissolve and disperse the polyvinyl alcohol. After the polyvinyl alcohol solution is dissolved, the reaction is carried out for 36 to 60 hours. Undissolved polyvinyl alcohol is removed by filtration to obtain a coating solution, and a solution in which the surfaces of the silica nanoparticles are coated with polyvinyl alcohol is obtained. The mass ratio of silica nanoparticles to polyvinyl alcohol powder is 1:9 to 1:12; (2) A step of preparing a zinc-containing porous carbon precursor dispersion, The solution of polyvinyl alcohol coated on the surface of silica nanoparticles prepared in step (1) is added to an aqueous zinc nitrate solution to continue the primary reaction, and zinc and polyvinyl alcohol are chelated to be supported on the surface of silica nanoparticles. Then, the pH value of the mixed solution is slowly adjusted to 11-12 with alkali, and the secondary reaction is continued under alkaline conditions to obtain a zinc-containing porous carbon precursor dispersion. The primary reaction time is 30 hours to 48 hours, and the reaction temperature is 60°C to 80°C. The alkali may specifically be a 0.1 mol / L sodium hydroxide solution or potassium hydroxide solution; The secondary reaction is carried out under alkaline conditions, and the reaction time is 4 to 8 hours. This step involves etching the internal silica and using the internal zinc ions to generate zinc hydroxide precipitates in the alkaline solution, thereby simultaneously achieving the etching of silica and the formation of zinc hydroxide precipitates; (3) A step of preparing a porous carbon material supporting zinc oxide, Finally, the zinc-containing porous carbon precursor dispersion liquid of step (2) is centrifuged, and the lower layer sediment is removed to obtain a zinc-containing porous carbon precursor. The lower layer zinc-containing porous carbon precursor is calcined under an oxygen atmosphere at 180°C to 200°C for 15 to 30 minutes, and then rapidly heated to 440°C to 450°C within 1 to 5 minutes, calcined without oxygen for 45 to 60 minutes, and then naturally cooled to obtain a porous carbon material carrying zinc oxide. Includes:

[0029] The calcination process begins with an aerobic calcination. The polyvinyl alcohol structure undergoes aerobic pre-oxidation carbonization at 180°C, where zinc hydroxide is oxidized and decomposed to form zinc oxide. This is followed by high-temperature oxygen-free carbonization. The carbon material formed in the oxygen-free environment undergoes a redox reaction with zinc oxide, ultimately producing excellent zinc oxide. This avoids the problems associated with blending and dispersion. The zinc oxide is substituted and reduced on the surface of the carbon material, forming a relatively stable zinc oxide-doped porous carbon structure. The zinc oxide-doped porous carbon structure fills the gaps between the flash-evaporated fibers of the flash-evaporated material, reducing light transmission and increasing light emission and refraction. The zinc oxide has good emission properties, thereby improving the heat-shielding performance of the product.

[0030] The spinning solvent is a surfactant and a solvent, The surfactant is present in the spinning solvent at a concentration of 500 ppm to 2000 ppm.

[0031] The surfactant is polyvinylpyrrolidone.

[0032] The solvents are aromatic hydrocarbons, aliphatic hydrocarbons, cycloaliphatic hydrocarbons, unsaturated hydrocarbons, halogenated hydrocarbons, and the like.

[0033] The preparation of the flash evaporation material is as follows: The prepared spinning solution is introduced into a spinning chamber to perform flash evaporation spinning, and flash evaporation fibers are obtained through the nozzle of a spinning assembly, and the flash evaporation fibers are then subjected to web forming and hot pressing processes to obtain flash evaporation materials.

[0034] The temperature of flash evaporation spinning is 200℃ to 220℃. The hot press temperature is 105°C to 115°C. [Effects of the Invention]

[0035] Compared with the prior art, the advantages of the present invention are as follows: The present invention experimentally finds that the haze decay rate and heat shielding rate decay rate of a flash evaporation material are closely related to factors such as at least the content of zinc oxide-loaded porous carbon material in the spinning raw material and the content of surfactant in the spinning solvent, and provides a novel manufacturing process for a flash evaporation material so that the prepared flash evaporation material has a lower haze decay rate and heat shielding rate decay rate, thereby overcoming the problem in the prior art that the heat shielding performance and haze performance of flash evaporation materials are obviously reduced after a certain period of use. DETAILED DESCRIPTION OF THE INVENTION

[0036] The present invention will now be described in more detail with reference to specific embodiments.

[0037] Example 1 This embodiment provides a flash evaporation material with low haze decay rate, which mainly includes preparing a spinning solution and preparing a flash evaporation material, where: The spinning solution is prepared as follows: the spinning raw material is dissolved in a spinning solvent to obtain a spinning solution; The spinning raw material is a porous carbon material carrying polyethylene and zinc oxide, The mass fraction of the porous carbon material supporting zinc oxide in the spinning raw material is 3%; A method for preparing a porous carbon material loaded with zinc oxide, which comprises the following specific technical steps: (1) A step of preparing a solution in which the surface of silica nanoparticles is coated with polyvinyl alcohol, Silica nanoparticles are added to deionized water and ultrasonically dispersed to obtain a dispersion, and polyvinyl alcohol powder is added to the dispersion, and the mixture is stirred while being heated at the same time. The heating temperature is controlled to 80°C to 100°C to dissolve and disperse the polyvinyl alcohol. After the polyvinyl alcohol solution is dissolved, the reaction is carried out for 36 to 60 hours. Undissolved polyvinyl alcohol is removed by filtration to obtain a coating solution, and a solution in which the surfaces of the silica nanoparticles are coated with polyvinyl alcohol is obtained. Step 1: The mass ratio of silica nanoparticles to polyvinyl alcohol powder is 1:9; (2) A step of preparing a zinc-containing porous carbon precursor dispersion, The solution of polyvinyl alcohol coated on the surface of silica nanoparticles prepared in step (1) is added to an aqueous zinc nitrate solution to continue the primary reaction, and zinc and polyvinyl alcohol are chelated to be supported on the surface of silica nanoparticles. Then, the pH value of the mixed solution is slowly adjusted to 11-12 with alkali, and the secondary reaction is continued under alkaline conditions to obtain a zinc-containing porous carbon precursor dispersion. The primary reaction time is 30 hours, and the reaction temperature is 60°C to 80°C. The alkali may specifically be a 0.1 mol / L sodium hydroxide solution or potassium hydroxide solution; The secondary reaction is carried out under alkaline conditions, and the reaction time is 5 hours. This step involves etching the internal silica and using the internal zinc ions to generate zinc hydroxide precipitates in the alkaline solution, thereby simultaneously achieving the etching of silica and the formation of zinc hydroxide precipitates; (3) A step of preparing a porous carbon material supporting zinc oxide, Finally, in step (ii), the zinc-containing porous carbon precursor dispersion is centrifuged, and the lower layer sediment is removed to obtain a zinc-containing porous carbon precursor. The lower layer zinc-containing porous carbon precursor is calcined under an oxygen atmosphere at 180-200°C for 15-30 minutes, and then rapidly heated to 440-450°C within 1-5 minutes, calcined without oxygen for 45-60 minutes, and then naturally cooled to obtain a porous carbon material carrying zinc oxide.

[0038] The spinning solvent is a surfactant and a solvent, The surfactant is 700 ppm in the spin solvent.

[0039] The surfactant is polyvinylpyrrolidone.

[0040] The solvents were chloroethane, dichloromethane, 1,1-dichloro-2,2-difluoroethane, and 1,1,2,2,3,3,4,4-octafluorobutane, and the mass ratio of these four solvents was 4:4:1:1.

[0041] The preparation of the flash evaporation material is as follows: The prepared spinning solution is introduced into a spinning chamber to perform flash evaporation spinning, and flash evaporation fibers are obtained through the nozzle of a spinning assembly, and the flash evaporation fibers are then subjected to web forming and hot pressing processes to obtain flash evaporation materials.

[0042] The temperature of flash evaporation spinning is 200°C. The temperature of the hot press is 105°C.

[0043] Performance test data for the flash evaporation materials prepared in this example are shown in Table 1.

[0044] Example 2 This embodiment provides a flash evaporation material with low haze decay rate, which mainly includes preparing a spinning solution and preparing a flash evaporation material, where: The spinning solution is prepared as follows: the spinning raw material is dissolved in a spinning solvent to obtain a spinning solution; The spinning raw material is a porous carbon material carrying polyethylene and zinc oxide, The mass fraction of the porous carbon material supporting zinc oxide in the spinning raw material is 4.5%; A method for preparing a porous carbon material loaded with zinc oxide, which comprises the following specific technical steps: (1) A step of preparing a solution in which the surface of silica nanoparticles is coated with polyvinyl alcohol, Silica nanoparticles are added to deionized water and ultrasonically dispersed to obtain a dispersion, and polyvinyl alcohol powder is added to the dispersion, and the mixture is stirred while being heated at the same time. The heating temperature is controlled to 80°C to 100°C to dissolve and disperse the polyvinyl alcohol. After the polyvinyl alcohol solution is dissolved, the reaction is carried out for 36 to 60 hours. Undissolved polyvinyl alcohol is removed by filtration to obtain a coating solution, and a solution in which the surfaces of the silica nanoparticles are coated with polyvinyl alcohol is obtained. Step 1: The mass ratio of silica nanoparticles to polyvinyl alcohol powder is 1:10.5; (2) A step of preparing a zinc-containing porous carbon precursor dispersion, The solution of polyvinyl alcohol coated on the surface of silica nanoparticles prepared in step (1) is added to an aqueous zinc nitrate solution to continue the primary reaction, and zinc and polyvinyl alcohol are chelated to be supported on the surface of silica nanoparticles. Then, the pH value of the mixed solution is slowly adjusted to 11-12 with alkali, and the secondary reaction is continued under alkaline conditions to obtain a zinc-containing porous carbon precursor dispersion. The primary reaction time is 40 hours, and the reaction temperature is 60°C to 80°C. The alkali may specifically be a 0.1 mol / L sodium hydroxide solution or potassium hydroxide solution; The secondary reaction is carried out under alkaline conditions, and the reaction time is 6 hours. This step involves etching the internal silica and using the internal zinc ions to generate zinc hydroxide precipitates in the alkaline solution, thereby simultaneously achieving the etching of silica and the formation of zinc hydroxide precipitates; (3) A step of preparing a porous carbon material supporting zinc oxide, Finally, in step (ii), the zinc-containing porous carbon precursor dispersion is centrifuged, and the lower layer sediment is removed to obtain a zinc-containing porous carbon precursor. The lower layer zinc-containing porous carbon precursor is calcined under an oxygen atmosphere at 180-200°C for 15-30 minutes, and then rapidly heated to 440-450°C within 1-5 minutes, calcined without oxygen for 45-60 minutes, and then naturally cooled to obtain a porous carbon material carrying zinc oxide.

[0045] The spinning solvent is a surfactant and a solvent, The surfactant is 1200 ppm in the spin solvent.

[0046] The surfactant is polyvinylpyrrolidone.

[0047] The solvents were chloroethane, dichloromethane, 1,1-dichloro-2,2-difluoroethane, and 1,1,2,2,3,3,4,4-octafluorobutane, and the mass ratio of these four solvents was 4:4:1:1.

[0048] The preparation of the flash evaporation material is as follows: The prepared spinning solution is introduced into a spinning chamber to perform flash evaporation spinning, and flash evaporation fibers are obtained through the nozzle of a spinning assembly, and the flash evaporation fibers are then subjected to web forming and hot pressing processes to obtain flash evaporation materials.

[0049] The flash evaporation spinning temperature is 210°C. The temperature of the hot press is 110°C.

[0050] Performance test data for the flash evaporation materials prepared in this example are shown in Table 1.

[0051] Example 3 This embodiment provides a flash evaporation material with low haze decay rate, which mainly includes preparing a spinning solution and preparing a flash evaporation material, where: The spinning solution is prepared as follows: the spinning raw material is dissolved in a spinning solvent to obtain a spinning solution; The spinning raw material is a porous carbon material carrying polyethylene and zinc oxide, The mass fraction of the porous carbon material supporting zinc oxide in the spinning raw material is 6%; A method for preparing a porous carbon material loaded with zinc oxide, which comprises the following specific technical steps: (1) A step of preparing a solution in which the surface of silica nanoparticles is coated with polyvinyl alcohol, Silica nanoparticles are added to deionized water and ultrasonically dispersed to obtain a dispersion, and polyvinyl alcohol powder is added to the dispersion, and the mixture is stirred while being heated at the same time. The heating temperature is controlled to 80°C to 100°C to dissolve and disperse the polyvinyl alcohol. After the polyvinyl alcohol solution is dissolved, the reaction is carried out for 36 to 60 hours. Undissolved polyvinyl alcohol is removed by filtration to obtain a coating solution, and a solution in which the surfaces of the silica nanoparticles are coated with polyvinyl alcohol is obtained. Step 1: The mass ratio of silica nanoparticles to polyvinyl alcohol powder is 1:12; (2) A step of preparing a zinc-containing porous carbon precursor dispersion, The solution of polyvinyl alcohol coated on the surface of silica nanoparticles prepared in step (1) is added to an aqueous zinc nitrate solution to continue the primary reaction, and zinc and polyvinyl alcohol are chelated to be supported on the surface of silica nanoparticles. Then, the pH value of the mixed solution is slowly adjusted to 11-12 with alkali, and the secondary reaction is continued under alkaline conditions to obtain a zinc-containing porous carbon precursor dispersion. The primary reaction time is 48 hours, and the reaction temperature is 60°C to 80°C. The alkali may specifically be a 0.1 mol / L sodium hydroxide solution or potassium hydroxide solution; The secondary reaction is carried out under alkaline conditions, and the reaction time is 8 hours. This step involves etching the internal silica and using the internal zinc ions to generate zinc hydroxide precipitates in the alkaline solution, thereby simultaneously achieving the etching of silica and the formation of zinc hydroxide precipitates; (3) A step of preparing a porous carbon material supporting zinc oxide, Finally, in step (ii), the zinc-containing porous carbon precursor dispersion is centrifuged, and the lower layer sediment is removed to obtain a zinc-containing porous carbon precursor. The lower layer zinc-containing porous carbon precursor is calcined under an oxygen atmosphere at 180-200°C for 15-30 minutes, and then rapidly heated to 440-450°C within 1-5 minutes, calcined without oxygen for 45-60 minutes, and then naturally cooled to obtain a porous carbon material carrying zinc oxide.

[0052] The spinning solvent is a surfactant and a solvent, The surfactant is at 2000 ppm in the spinning solvent.

[0053] The surfactant is polyvinylpyrrolidone.

[0054] The solvents were chloroethane, dichloromethane, 1,1-dichloro-2,2-difluoroethane, and 1,1,2,2,3,3,4,4-octafluorobutane, and the mass ratio of these four solvents was 4:4:1:1.

[0055] The preparation of the flash evaporation material is as follows: The prepared spinning solution is introduced into a spinning chamber to perform flash evaporation spinning, and flash evaporation fibers are obtained through the nozzle of a spinning assembly, and the flash evaporation fibers are then subjected to web forming and hot pressing processes to obtain flash evaporation materials.

[0056] The temperature of the flash evaporation spinning is 220°C. The temperature of the hot press is 115°C.

[0057] Performance test data for the flash evaporation materials prepared in this example are shown in Table 1.

[0058] Comparative Example 1 This comparative example provides a flash evaporation material, which mainly includes the preparation of a spinning solution and the preparation of a flash evaporation material, where: The spinning solution is prepared as follows: the spinning raw material is dissolved in a spinning solvent to obtain a spinning solution; The spinning material is polyethylene, The spinning solvent is a surfactant and a solvent, The surfactant is 1200 ppm in the spin solvent.

[0059] The surfactant is polyvinylpyrrolidone.

[0060] The solvents were chloroethane, dichloromethane, 1,1-dichloro-2,2-difluoroethane, and 1,1,2,2,3,3,4,4-octafluorobutane, and the mass ratio of these four solvents was 4:4:1:1.

[0061] The preparation of the flash evaporation material is as follows: The prepared spinning solution is introduced into a spinning chamber to perform flash evaporation spinning, and flash evaporation fibers are obtained through the nozzle of a spinning assembly, and the flash evaporation fibers are then subjected to web forming and hot pressing processes to obtain flash evaporation materials.

[0062] The flash evaporation spinning temperature is 210°C. The temperature of the hot press is 110°C.

[0063] The performance test data for the flash evaporation material prepared in this comparative example are shown in Table 1.

[0064] Comparative Example 2 This comparative example provides a flash evaporation material, which mainly includes the preparation of a spinning solution and the preparation of a flash evaporation material, where: The spinning solution is prepared as follows: the spinning raw material is dissolved in a spinning solvent to obtain a spinning solution; The spinning raw material is a porous carbon material carrying polyethylene and zinc oxide, The mass fraction of the porous carbon material supporting zinc oxide in the spinning raw material is 1%; The method for preparing the porous carbon material supporting zinc oxide was the same as in Example 2.

[0065] The spinning solvent is a surfactant and a solvent, The surfactant is 1200 ppm in the spin solvent.

[0066] The surfactant is polyvinylpyrrolidone.

[0067] The solvents were chloroethane, dichloromethane, 1,1-dichloro-2,2-difluoroethane, and 1,1,2,2,3,3,4,4-octafluorobutane, and the mass ratio of these four solvents was 4:4:1:1.

[0068] The preparation of the flash evaporation material is as follows: The prepared spinning solution is introduced into a spinning chamber to perform flash evaporation spinning, and flash evaporation fibers are obtained through the nozzle of a spinning assembly, and the flash evaporation fibers are then subjected to web forming and hot pressing processes to obtain flash evaporation materials.

[0069] The flash evaporation spinning temperature is 210°C. The temperature of the hot press is 110°C.

[0070] The performance test data for the flash evaporation material prepared in this comparative example are shown in Table 1.

[0071] Comparative Example 3 This comparative example provides a flash evaporation material, which mainly includes the preparation of a spinning solution and the preparation of a flash evaporation material, where: The spinning solution is prepared as follows: the spinning raw material is dissolved in a spinning solvent to obtain a spinning solution; The spinning raw material is a porous carbon material carrying polyethylene and zinc oxide, The mass fraction of the porous carbon material supporting zinc oxide in the spinning raw material is 2%; The method for preparing the porous carbon material supporting zinc oxide was the same as in Example 2.

[0072] The spinning solvent is a surfactant and a solvent, The surfactant is 1200 ppm in the spin solvent.

[0073] The surfactant is polyvinylpyrrolidone.

[0074] The solvents were chloroethane, dichloromethane, 1,1-dichloro-2,2-difluoroethane, and 1,1,2,2,3,3,4,4-octafluorobutane, and the mass ratio of these four solvents was 4:4:1:1.

[0075] The preparation of the flash evaporation material is as follows: The prepared spinning solution is introduced into a spinning chamber to perform flash evaporation spinning, and flash evaporation fibers are obtained through the nozzle of a spinning assembly, and the flash evaporation fibers are then subjected to web forming and hot pressing processes to obtain flash evaporation materials.

[0076] The flash evaporation spinning temperature is 210°C. The temperature of the hot press is 110°C.

[0077] The performance test data for the flash evaporation material prepared in this comparative example are shown in Table 1.

[0078] Comparative Example 4 This comparative example provides a flash evaporation material, which mainly includes the preparation of a spinning solution and the preparation of a flash evaporation material, where: The spinning solution is prepared as follows: the spinning raw material is dissolved in a spinning solvent to obtain a spinning solution; The spinning raw material is a porous carbon material carrying polyethylene and zinc oxide, The mass fraction of the porous carbon material supporting zinc oxide in the spinning raw material is 8%; The method for preparing the porous carbon material supporting zinc oxide was the same as in Example 2.

[0079] The spinning solvent is a surfactant and a solvent, The surfactant is 1200 ppm in the spin solvent.

[0080] The surfactant is polyvinylpyrrolidone.

[0081] The solvents were chloroethane, dichloromethane, 1,1-dichloro-2,2-difluoroethane, and 1,1,2,2,3,3,4,4-octafluorobutane, and the mass ratio of these four solvents was 4:4:1:1.

[0082] The preparation of the flash evaporation material is as follows: The prepared spinning solution is introduced into a spinning chamber to perform flash evaporation spinning, and flash evaporation fibers are obtained through the nozzle of a spinning assembly, and the flash evaporation fibers are then subjected to web forming and hot pressing processes to obtain flash evaporation materials.

[0083] The flash evaporation spinning temperature is 210°C. The temperature of the hot press is 110°C.

[0084] The performance test data for the flash evaporation material prepared in this comparative example are shown in Table 1.

[0085] Comparative Example 5 This comparative example provides a flash evaporation material, which mainly includes the preparation of a spinning solution and the preparation of a flash evaporation material, where: The spinning solution is prepared as follows: the spinning raw material is dissolved in a spinning solvent to obtain a spinning solution; The spinning raw material is a porous carbon material carrying polyethylene and zinc oxide, The mass fraction of the porous carbon material supporting zinc oxide in the spinning raw material is 9%; The method for preparing the porous carbon material supporting zinc oxide was the same as in Example 2.

[0086] The spinning solvent is a surfactant and a solvent, The surfactant is 1200 ppm in the spin solvent.

[0087] The surfactant is polyvinylpyrrolidone.

[0088] The solvents were chloroethane, dichloromethane, 1,1-dichloro-2,2-difluoroethane, and 1,1,2,2,3,3,4,4-octafluorobutane, and the mass ratio of these four solvents was 4:4:1:1.

[0089] The preparation of the flash evaporation material is as follows: The prepared spinning solution is introduced into a spinning chamber to perform flash evaporation spinning, and flash evaporation fibers are obtained through the nozzle of a spinning assembly, and the flash evaporation fibers are then subjected to web forming and hot pressing processes to obtain flash evaporation materials.

[0090] The flash evaporation spinning temperature is 210°C. The temperature of the hot press is 110°C.

[0091] The performance test data for the flash evaporation material prepared in this comparative example are shown in Table 1.

[0092] Comparative Example 6 This comparative example provides a flash evaporation material, which mainly includes the preparation of a spinning solution and the preparation of a flash evaporation material, where: The spinning solution is prepared as follows: the spinning raw material is dissolved in a spinning solvent to obtain a spinning solution; The spinning raw material is a porous carbon material carrying polyethylene and zinc oxide, The mass fraction of the porous carbon material supporting zinc oxide in the spinning raw material is 4.5%; The method for preparing the porous carbon material supporting zinc oxide was the same as in Example 2. The spinning solvent is a solvent, The solvents were chloroethane, dichloromethane, 1,1-dichloro-2,2-difluoroethane, and 1,1,2,2,3,3,4,4-octafluorobutane, and the mass ratio of these four solvents was 4:4:1:1.

[0093] The preparation of the flash evaporation material is as follows: The prepared spinning solution is introduced into a spinning chamber to perform flash evaporation spinning, and flash evaporation fibers are obtained through the nozzle of a spinning assembly, and the flash evaporation fibers are then subjected to web forming and hot pressing processes to obtain flash evaporation materials.

[0094] The flash evaporation spinning temperature is 210°C. The temperature of the hot press is 110°C.

[0095] The performance test data for the flash evaporation material prepared in this comparative example are shown in Table 1.

[0096] Comparative Example 7 This comparative example provides a flash evaporation material, which mainly includes the preparation of a spinning solution and the preparation of a flash evaporation material, where: The spinning solution is prepared as follows: the spinning raw material is dissolved in a spinning solvent to obtain a spinning solution; The spinning raw material is a porous carbon material carrying polyethylene and zinc oxide, The mass fraction of the porous carbon material supporting zinc oxide in the spinning raw material is 4.5%; The method for preparing the porous carbon material supporting zinc oxide was the same as in Example 2. The spinning solvent is a surfactant and a solvent, The surfactant is 200 ppm in the spinning solvent.

[0097] The surfactant is polyvinylpyrrolidone.

[0098] The solvents were chloroethane, dichloromethane, 1,1-dichloro-2,2-difluoroethane, and 1,1,2,2,3,3,4,4-octafluorobutane, and the mass ratio of these four solvents was 4:4:1:1.

[0099] The preparation of the flash evaporation material is as follows: The prepared spinning solution is introduced into a spinning chamber to perform flash evaporation spinning, and flash evaporation fibers are obtained through the nozzle of a spinning assembly, and the flash evaporation fibers are then subjected to web forming and hot pressing processes to obtain flash evaporation materials.

[0100] The flash evaporation spinning temperature is 210°C. The temperature of the hot press is 110°C.

[0101] The performance test data for the flash evaporation material prepared in this comparative example are shown in Table 1.

[0102] Comparative Example 8 This comparative example provides a flash evaporation material, which mainly includes the preparation of a spinning solution and the preparation of a flash evaporation material, where: The spinning solution is prepared as follows: the spinning raw material is dissolved in a spinning solvent to obtain a spinning solution; The spinning raw material is a porous carbon material carrying polyethylene and zinc oxide, The mass fraction of the porous carbon material supporting zinc oxide in the spinning raw material is 4.5%; The method for preparing the porous carbon material supporting zinc oxide was the same as in Example 2.

[0103] The spinning solvent is a surfactant and a solvent, The surfactant is at 2000 ppm in the spinning solvent.

[0104] The surfactant is polyvinylpyrrolidone.

[0105] The solvents were chloroethane, dichloromethane, 1,1-dichloro-2,2-difluoroethane, and 1,1,2,2,3,3,4,4-octafluorobutane, and the mass ratio of these four solvents was 4:4:1:1.

[0106] The preparation of the flash evaporation material is as follows: The prepared spinning solution is introduced into a spinning chamber to perform flash evaporation spinning, and flash evaporation fibers are obtained through the nozzle of a spinning assembly, and the flash evaporation fibers are then subjected to web forming and hot pressing processes to obtain flash evaporation materials.

[0107] The flash evaporation spinning temperature is 210°C. The temperature of the hot press is 110°C.

[0108] The performance test data for the flash evaporation material prepared in this comparative example are shown in Table 1. JPEG2026503741000001.jpg93170

[0109] Result analysis: Comparing the above data, it can be seen that increasing the amount of zinc oxide-loaded porous carbon material in the spinning raw material reduces the haze decay rate and heat shielding coefficient decay rate, but once it reaches a certain amount, the rate of decline slows down significantly. Increasing the amount of surfactant in the spinning solvent also reduces the haze decay rate and heat shielding coefficient decay rate, but once it reaches a certain amount, the rate of decline also slows down significantly.

[0110] The specific embodiments described herein are merely illustrative of the spirit of the present invention, and those skilled in the art may make various modifications or additions to the specific embodiments described, or may substitute them in similar ways, without departing from the spirit of the present invention or beyond the scope defined in the appended claims.

Claims

1. A flash evaporation material with low haze decay rate, wherein the raw material of the flash evaporation material comprises polyethylene, and the basis weight of the flash spun nonwoven fabric is 35 g / m ２ is larger than The compression ratio P of the flash evaporation material is 0.07 gf cm / cm ２ is larger than Compression ratio work is tested by KES style tester, compression ratio work is tested by FB3, The haze decay rate ΔW of the flash evaporation material is 0.3% to 1.5%; △W=(W ０ -W ５ ) / W ０ *100%、 The attenuation rate ΔS of the heat insulation rate of the flash evaporation material is 7% to 15%; △S=(S ０ -S ５ ) / S ０ *100%、 The tests for heat insulation rate, haze and transverse tensile strength are as follows: (1) The sample is left at 25°C and a relative humidity of 65% for 24 hours, and then its shading index is measured to determine the initial shading rate S ０ The haze was measured to obtain the initial haze W ０ The tensile strength in the transverse direction is measured to obtain the transverse tensile strength CTS. ０ He wrote, (2) Then, after exposing to a dry heat atmosphere at 90°C for 6 hours and cooling under conditions of 25°C and relative humidity of 65% for 24 hours, (3) Repeat the operation of step (2) four more times, and then measure the shading index to obtain the final shading rate S ５ The haze is measured and the final haze W ５ The tensile strength in the transverse direction is measured to obtain the final transverse tensile strength CTS. ５ He wrote, Haze is tested according to national standard GB / T2410-2008, A flash evaporation material with low haze decay rate, characterized in that the heat insulating rate is tested according to the national standard GB / T41560-2022 measurement.

2. The basis weight of the flash spun nonwoven fabric is 75 g / m ２ 2. The low haze decay rate flash evaporation material of claim 1, wherein the haze decay rate is less than 0.

05.

3. The compression specific work P of flash spun nonwoven fabric is 0.15 gf cm / cm ２ 2. The low haze decay rate flash evaporation material of claim 1, wherein the haze decay rate is greater than 0.

05.

4. 2. The flash evaporation material with low haze decay rate according to claim 1, wherein the flash evaporation material has a haze decay rate ΔW of 0.6% to 0.9%.

5. 2. The flash evaporation material with low haze decay rate according to claim 1, wherein the flash evaporation material has a haze decay rate ΔW of 0.9% to 1.3%.

6. 2. The flash evaporation material with low haze decay rate according to claim 1, wherein the decay rate of the heat insulation rate of the flash evaporation material is 7% to 10%.

7. 2. The flash evaporation material with low haze decay rate according to claim 1, wherein the decay rate of the heat insulation rate of the flash evaporation material is 10% to 14%.

8. The transverse tensile strength decay rate ΔCTS of the flash evaporation material is 2% to 10%; △CTS=(CTS ０ -CTS ５ ) / CTS ０ *100%、 Transverse tensile strength CTS ０ 2. The low haze decay rate flash evaporation material of claim 1, wherein the haze decay rate is greater than 1.4 KN / m.

9. The flash evaporation material with low haze decay rate according to claim 8, wherein the flash evaporation material has a transverse tensile strength decay rate ΔCTS of 3% to 5%.

10. The flash evaporation material with low haze decay rate according to claim 8, characterized in that the flash evaporation material has a transverse tensile strength decay rate ΔCTS of 5% to 7%.

11. The flash evaporation material with low haze decay rate described in claim 1, characterized in that the spinning raw material is a porous carbon material supported by polyethylene and zinc oxide, and the spinning solvent is a surfactant and a solvent.

12. The mass fraction of the porous carbon material supporting zinc oxide in the spinning raw material is 3% to 6%; 12. The low haze decay rate flash evaporation material of claim 11, wherein the surfactant is 500 ppm to 2000 ppm in the spinning solvent.

13. The porous carbon material supporting zinc oxide is (1) preparing a solution in which the surface of silica nanoparticles is coated with polyvinyl alcohol; (2) preparing a zinc-containing porous carbon precursor dispersion, adding the solution of polyvinyl alcohol coated on the surface of the silica nanoparticles prepared in step (1) to an aqueous zinc nitrate solution to continue the primary reaction, so that zinc and polyvinyl alcohol are chelated and supported on the surface of the silica nanoparticles; and then slowly adjusting the pH value of the mixed solution to 11-12 with an alkali, and continuing the secondary reaction under alkaline conditions to obtain a zinc-containing porous carbon precursor dispersion; (3) A step of preparing a porous carbon material supporting zinc oxide, Finally, the zinc-containing porous carbon precursor dispersion liquid of step (ii) is centrifuged to remove the lower layer sediment, thereby obtaining a zinc-containing porous carbon precursor, which is then calcined under an oxygen atmosphere at 180°C to 200°C for 15 to 30 minutes, and then rapidly heated to 440°C to 450°C within 1 to 5 minutes, calcined without oxygen for 45 to 60 minutes, and then naturally cooled to obtain a porous carbon material carrying zinc oxide; 12. The low haze decay rate flash evaporation material of claim 11, prepared by:

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