Flashspun material having low haze attenuation rate

Abstract

A flashspun material having a low haze attenuation rate. The raw materials of the flashspun material comprise polyethylene; the fabric weight of a flashspun non-woven fabric is greater than 35 g / m2; the compressional energy P of the flashspun material is greater than 0.07 gf·cm / cm2; the compressional energy is tested by means of a KES style tester, and FB3 is used to test the compressional energy; the haze attenuation rate ΔW of the flashspun material ranges from 0.3% to 1.5%, wherein ΔW=(W0-W5) / W0*100%; and the attenuation rate ΔS of the heat shielding rate of the flashspun material ranges from 7% to 15%, wherein ΔS=(S0-S5) / S0*100%. The spinning raw materials are modified to improve the performance of flashspun materials, thereby widening the application of the flashspun materials.

Description

A flash evaporation material with low fog attenuation rate Technical Field

[0001] The invention belongs to the field of flash evaporation technology, and in particular relates to a flash evaporation material with a low haze attenuation rate. Background Art

[0002] Flash spinning involves dissolving polymers like PE and PP in a specific spinning solvent to create a spinning solution. The solution is then ejected from the spinneret. The rapid evaporation of the solvent causes the polymer to solidify into fibers, which are then adsorbed onto a mesh curtain to form a web. The web is then heat-pressed and wound to create the flash-spun material. Currently, the raw polymer for the flash spinning process is PE. Flash-spun polyethylene non-woven fabrics possess numerous excellent properties, including excellent waterproof and breathable properties; excellent sheet strength, tear resistance, puncture resistance, and rupture resistance; generally non-pilling and dust-free; and excellent performance across a wide temperature range. Consequently, flash-spun polyethylene non-woven fabrics are widely used in packaging, protective clothing, drapes, and printing substrates.

[0003] Chinese Patent Publication No. CN114687057A relates to a flash-steamed sheet and its application. The flash-steamed sheet is made of polyethylene and a modifier; the flash-steamed sheet has a bending length attenuation value, ΔC, of ​​0.1 to 0.4; ΔC = 1 - C2 / C1; C1 is the bending length of the unaged flash-steamed sheet; C2 is the bending length of the aged flash-steamed sheet; and the bending length C2 of the aged flash-steamed sheet is 4 to 10 centimeters. The flash-steamed sheet maintains brightness while maintaining minimal loss of bending length, extending the product's service life and expanding its application range.

[0004] Chinese Patent Publication No. CN114687069A relates to a multifunctional polymer nonwoven fabric and fabric thereof, characterized by an elongation at break decay rate (▲E) of 0.20 to 0.50; ▲E = 1 - E2 / E1, where E1 is the elongation at break of the multifunctional polymer nonwoven fabric before aging treatment; E2 is the elongation at break of the multifunctional polymer nonwoven fabric after aging treatment; and the value of E2 is less than 0.5. The process of this application is simple and has a wide range of applications.

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

[0006] Chinese Patent Publication No. CN114108112A relates to a polyethylene sheet characterized by an aging rate (ΔS) of tensile strength of 0.10 to 0.30; ΔS = 1-S2 / S1; S1 is the tensile strength of the unaged non-woven fabric, in kN / m; S2 is the tensile strength of the aged non-woven fabric, in kN / m; and the aging process conditions are: an irradiance of 60±2 W / m2 at a wavelength of 300 to 400 nm, a black mark temperature of 65±2°C, an air temperature of 38±3°C in the test chamber, a relative humidity of 50±10%, and a drying time of 1440 hours. The product of the present invention maintains good tensile strength after aging, thereby extending the product's service life.

[0007] Chinese Patent Publication No. CN115537959A relates to a composite material characterized by comprising polyethylene as a raw material; a shrinkage ratio R of 0.2 to 0.7; a standard heat shrinkage strength σr of 0.5 to 3.5 N / mm²; and a mildew resistance rating of less than Class 2. This composite material exhibits excellent shrinkage properties and antibacterial and mildew resistance, and therefore has a wide range of applications.

[0008] Chinese Patent Publication No. CN109154138A relates to a composite material including a nonwoven vapor permeable sheet. A composite laminate comprises at least one water vapor permeable nonwoven sheet having a first and a 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 not more than 0.4 gsm, and (ii) the composite laminate exhibits a retained water head of at least 60% after exposure to wet wood.

[0009] US Patent Publication No. US20160138197A1 relates to flash-spun plexifilamentary precursors and sheets with a BET surface area less than 12 m2 A sheet prepared from a flash-spun plexifilamentary fiber bundle having a crush value of at least 0.9 mm / g, wherein the fiber bundle comprises primarily fibers formed from polyethylene, the fibers having a total crystallinity index of less than 55%, and the fiber bundle having an elongation at break greater than 55%.

[0010] US Patent Publication No. 8,048,513 relates to an improved plexifilamentary sheet material for protective apparel and filter media, the material being composed of substantially continuous polyethylene plexifilamentary fiber bundles and having a Frazier permeability normalized to 1.0 ounce per yard of at least 2 cfm / ft 2 .

[0011] In the prior art, there are few studies on the heat shielding and haze performance of flash vaporized materials. In addition, the heat shielding and haze performance of flash vaporized materials decrease after being used for a period of time.

[0012] Summary of the Invention

[0013] The object of the present invention is to provide a flash evaporation material with low haze attenuation rate in order to solve the above problems.

[0014] In order to achieve the above object, the present invention adopts the following technical solutions:

[0015] A flash evaporation material with low haze attenuation rate, characterized in that the raw material of the flash evaporation material comprises polyethylene, and the weight of the flash spun non-woven fabric is greater than 35g / m 2 ,

[0016] The compression ratio P of the flash material is greater than 0.07gf·cm / cm 2 ;

[0017] The compression ratio work is tested by KES style tester and the compression ratio work is tested by FB3;

[0018] The haze attenuation rate ΔW of the flash vaporized material is 0.3% to 1.5%; ΔW = (W0-W5) / W0*100%;

[0019] The heat shielding rate of the flash material is reduced by △S from 7% to 15%; △S=(S0-S5) / S0*100%

[0020] Heat shielding rate, haze and transverse tensile strength tests:

[0021] (1) The sample was placed at 25°C and 65% relative humidity for 24 hours; then its sunshade index was measured and recorded as the initial heat shielding rate S0, its haze was measured and recorded as the initial haze W0, and its transverse tensile strength was measured and recorded as the transverse tensile strength CTS0;

[0022] (2) then exposed to a dry heat atmosphere at 90°C for 6 hours, and then cooled at 25°C and 65% relative humidity for 24 hours;

[0023] (3) Repeat step (2) for another 4 treatments, then measure the sunshade 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;

[0024] Haze is tested according to the national standard GB / T2410-2008;

[0025] The heat shielding rate is measured according to the national standard GB / T41560-2022.

[0026] The tensile strength is measured according to the national standard GB / T 12914-2018. The tensile strength is the maximum tension that a specimen of unit width can withstand before breaking under specified test conditions.

[0027] The weight of flash spun nonwoven fabric is less than 75g / m 2 .

[0028] The weight of flash spun nonwoven fabric is less than 65g / m 2 .

[0029] The compression ratio P of flash spun nonwoven fabric is greater than 0.15gf·cm / cm 2 .

[0030] The compression ratio P of flash spun nonwoven fabric is less than 2gf·cm / cm 2 .

[0031] The compression ratio P of flash spun nonwoven fabric is less than 1gf·cm / cm 2 .

[0032] The haze attenuation rate ΔW of the flash vaporized material is 0.6% to 0.9%.

[0033] The haze attenuation rate ΔW of the flash vaporized material is 0.9% to 1.3%.

[0034] The attenuation rate of the heat shielding rate of the flash evaporation material is 7% to 10%.

[0035] The attenuation rate of the heat shielding rate of the flash vapor material is 10% to 14%.

[0036] The transverse tensile strength attenuation rate ΔCTS of the flash evaporated material is 2% to 10%; ΔCTS = (CTS0-CTS5) / CTS0*100%;

[0037] The transverse tensile strength CTS0 is greater than 1.4KN / m.

[0038] The transverse tensile strength attenuation rate △CTS of the flash evaporated material is 3% to 5%.

[0039] The transverse tensile strength attenuation rate △CTS of the flash evaporated material is 5% to 7%.

[0040] The transverse tensile strength attenuation rate △CTS of the flash evaporated material is 7% to 9%.

[0041] A method for preparing a flash vapor material with a low haze attenuation rate, which mainly comprises the preparation of a spinning solution and the preparation of a flash vapor material;

[0042] in:

[0043] Preparation of spinning solution: dissolving the spinning raw materials in the spinning solvent to obtain the spinning solution;

[0044] The spinning materials are polyethylene and porous carbon material loaded with zinc oxide;

[0045] The mass fraction of the porous carbon material loaded with zinc oxide in the spinning raw material is 3% to 6%;

[0046] The preparation method of the porous carbon material loaded with zinc oxide comprises the following specific technical steps:

[0047] (1) Preparation of solution of polyvinyl alcohol coated on the surface of silica nanoparticles:

[0048] Adding silica nanoparticles to deionized water for ultrasonic dispersion to obtain a dispersion liquid, then adding polyvinyl alcohol powder to the dispersion liquid, while heating and stirring, controlling the heating temperature to 80°C to 100°C for dissolution and dispersion, after the polyvinyl alcohol solution is dissolved, reacting for 36 hours to 60 hours, and then filtering to remove undissolved polyvinyl alcohol to obtain a coating solution, thereby obtaining a solution in which the surface of the silica nanoparticles is coated with polyvinyl alcohol;

[0049] The mass ratio of silica nanoparticles to polyvinyl alcohol powder is 1:9 to 1:12;

[0050] (2) Preparation of zinc-containing porous carbon precursor dispersion

[0051] The solution of polyvinyl alcohol coated on the surface of the silica nanoparticles prepared in step (1) is then added to the aqueous zinc nitrate solution to continue the primary reaction, so that zinc and polyvinyl alcohol undergo a chelating reaction and are loaded on the surface of the silica nanoparticles. The pH value of the mixed solution is then slowly adjusted to 11-12 with an alkali, and a secondary reaction is continued under alkaline conditions to obtain a zinc-containing porous carbon precursor dispersion.

[0052] The primary reaction time is 30 hours to 48 hours, and the reaction temperature is 60°C to 80°C;

[0053] The base can specifically be a 0.1 mol / L sodium hydroxide solution or potassium hydroxide solution;

[0054] The secondary reaction is carried out under alkaline conditions, and the reaction time is 4 hours to 8 hours;

[0055] In this step, the internal silicon dioxide is etched, and at the same time, the internal zinc ions generate zinc hydroxide precipitation in the alkaline solution, so that silicon dioxide etching and zinc hydroxide precipitation are carried out simultaneously;

[0056] (III) Preparation of porous carbon materials loaded with zinc oxide:

[0057] Finally, the zinc-containing porous carbon precursor dispersion in step (2) is centrifuged, and the lower layer of precipitate is removed to obtain a zinc-containing porous carbon precursor; the lower layer of zinc-containing porous carbon precursor is aerobically calcined 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, and calcined in an oxygen-free state for 45 to 60 minutes, and naturally cooled to obtain a porous carbon material loaded with zinc oxide.

[0058] During the calcination process, aerobic calcination is first performed. Since the polyvinyl alcohol structure undergoes aerobic pre-oxidation and carbonization at 180°C, and zinc hydroxide is oxidatively decomposed to form zinc oxide, it is then transferred to high-temperature oxygen-free carbonization. The carbon material formed in the oxygen-free environment undergoes an oxidation-reduction reaction with zinc oxide, ultimately generating zinc oxide with excellent properties. This avoids the dispersion problems of conventional blending and addition. Zinc oxide is generated on the surface of the carbon material and replaces the reduced carbon material, forming a relatively stable porous carbon structure doped with zinc oxide. The porous carbon structure doped with zinc oxide fills the gaps between the flash-evaporated fibers of the flash-evaporated material, reducing the transmission of light and increasing the emission and refraction of light. Zinc oxide has good emission properties, thereby improving the heat shielding performance of the product.

[0059] The spinning solvent is a surfactant and a solvent;

[0060] The surfactant content in the spinning solvent is 500 ppm to 2000 ppm.

[0061] The surfactant is polyvinyl pyrrolidone.

[0062] The solvent is aromatic hydrocarbons, aliphatic hydrocarbons, alicyclic hydrocarbons, unsaturated hydrocarbons, halogenated hydrocarbons and the like and the like.

[0063] Preparation of flash materials:

[0064] The prepared spinning solution is fed into the spinning chamber for flash spinning, and flash fibers are obtained through the nozzle of the spinning assembly. The flash fibers are then passed through a web laying and hot pressing process to obtain flash materials.

[0065] The temperature of flash spinning is 200℃~220℃;

[0066] The temperature of hot pressing is 105℃~115℃.

[0067] Compared with the prior art, the present invention has the following positive effects:

[0068] The present invention discovered through experiments that the haze attenuation rate and heat shielding rate attenuation rate of the flash vaporization material are closely related to factors such as at least the content of the porous carbon material loaded with zinc oxide in the spinning raw material and the content of the surfactant in the spinning solvent, and provides a new flash vaporization material preparation process, so that the prepared flash vaporization material has a lower haze attenuation rate and heat shielding rate attenuation rate, thereby overcoming the problem in the prior art that the heat shielding performance and haze performance of the flash vaporization material will be significantly reduced after being used for a period of time. DETAILED DESCRIPTION

[0069] The present invention will be further described in detail below with reference to specific embodiments.

[0070] Example 1

[0071] This embodiment provides a flash vaporization material with low haze attenuation rate, which mainly includes the preparation of spinning solution and the preparation of flash vaporization material;

[0072] in:

[0073] Preparation of spinning solution: dissolving the spinning raw materials in the spinning solvent to obtain the spinning solution;

[0074] The spinning materials are polyethylene and porous carbon material loaded with zinc oxide;

[0075] The mass fraction of the porous carbon material loaded with zinc oxide in the spinning raw material is 3%;

[0076] The preparation method of the porous carbon material loaded with zinc oxide comprises the following specific technical steps:

[0077] (1) Preparation of solution of polyvinyl alcohol coated silica nanoparticles:

[0078] Adding silica nanoparticles to deionized water for ultrasonic dispersion to obtain a dispersion liquid, then adding polyvinyl alcohol powder to the dispersion liquid, while heating and stirring, controlling the heating temperature to 80°C to 100°C for dissolution and dispersion, after the polyvinyl alcohol solution is dissolved, reacting for 36 hours to 60 hours, and then filtering to remove undissolved polyvinyl alcohol to obtain a coating solution, thereby obtaining a solution in which the surface of the silica nanoparticles is coated with polyvinyl alcohol;

[0079] The mass ratio of silica nanoparticles to polyvinyl alcohol powder was 1:9;

[0080] (2) Preparation of zinc-containing porous carbon precursor dispersion

[0081] The solution of polyvinyl alcohol coated on the surface of the silica nanoparticles prepared in step (1) is then added to the aqueous zinc nitrate solution to continue the primary reaction, so that zinc and polyvinyl alcohol undergo a chelating reaction and are loaded on the surface of the silica nanoparticles. The pH value of the mixed solution is then slowly adjusted to 11-12 with an alkali, and a secondary reaction is continued under alkaline conditions to obtain a zinc-containing porous carbon precursor dispersion.

[0082] The primary reaction time is 30 hours, and the reaction temperature is 60°C to 80°C;

[0083] The base can specifically be a 0.1 mol / L sodium hydroxide solution or potassium hydroxide solution;

[0084] The secondary reaction was carried out under alkaline conditions with a reaction time of 5 hours;

[0085] In this step, the internal silicon dioxide is etched, and at the same time, the internal zinc ions generate zinc hydroxide precipitation in the alkaline solution, so that silicon dioxide etching and zinc hydroxide precipitation are carried out simultaneously;

[0086] (III) Preparation of porous carbon materials loaded with zinc oxide:

[0087] Finally, the zinc-containing porous carbon precursor dispersion in step (2) is centrifuged, and the lower layer of precipitate is removed to obtain a zinc-containing porous carbon precursor; the lower layer of zinc-containing porous carbon precursor is aerobically calcined 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, and calcined in an oxygen-free state for 45 to 60 minutes, and naturally cooled to obtain a porous carbon material loaded with zinc oxide.

[0088] The spinning solvent is a surfactant and a solvent;

[0089] The surfactant was present in the spinning solvent at 700 ppm.

[0090] The surfactant is polyvinyl pyrrolidone.

[0091] The solvents are ethyl chloride, dichloromethane, 1,1-dichloro-2,2-difluoroethane, and 1,1,2,2,3,3,4,4-octafluorobutane, and the mass ratio of the four is 4:4:1:1.

[0092] Preparation of flash materials:

[0093] The prepared spinning solution is fed into the spinning chamber for flash spinning, and flash fibers are obtained through the nozzle of the spinning assembly. The flash fibers are then passed through a web laying and hot pressing process to obtain flash materials.

[0094] The flash spinning temperature was 200°C;

[0095] The temperature of hot pressing was 105°C.

[0096] The performance test data of the flash vaporized material prepared in this example are shown in Table 1.

[0097] Example 2

[0098] This embodiment provides a flash vaporization material with low haze attenuation rate, which mainly includes the preparation of spinning solution and the preparation of flash vaporization material;

[0099] in:

[0100] Preparation of spinning solution: dissolving the spinning raw materials in the spinning solvent to obtain the spinning solution;

[0101] The spinning materials are polyethylene and porous carbon material loaded with zinc oxide;

[0102] The mass fraction of the porous carbon material loaded with zinc oxide in the spinning raw material is 4.5%;

[0103] The preparation method of the porous carbon material loaded with zinc oxide comprises the following specific technical steps:

[0104] (1) Preparation of solution of polyvinyl alcohol coated silica nanoparticles:

[0105] Adding silica nanoparticles to deionized water for ultrasonic dispersion to obtain a dispersion liquid, then adding polyvinyl alcohol powder to the dispersion liquid, while heating and stirring, controlling the heating temperature to 80°C to 100°C for dissolution and dispersion, after the polyvinyl alcohol solution is dissolved, reacting for 36 hours to 60 hours, and then filtering to remove undissolved polyvinyl alcohol to obtain a coating solution, thereby obtaining a solution in which the surface of the silica nanoparticles is coated with polyvinyl alcohol;

[0106] The mass ratio of silica nanoparticles to polyvinyl alcohol powder was 1:10.5;

[0107] (2) Preparation of zinc-containing porous carbon precursor dispersion

[0108] The solution of polyvinyl alcohol coated on the surface of the silica nanoparticles prepared in step (1) is then added to the aqueous zinc nitrate solution to continue the primary reaction, so that zinc and polyvinyl alcohol undergo a chelating reaction and are loaded on the surface of the silica nanoparticles. The pH value of the mixed solution is then slowly adjusted to 11-12 with an alkali, and a secondary reaction is continued under alkaline conditions to obtain a zinc-containing porous carbon precursor dispersion.

[0109] The primary reaction time is 40 hours, and the reaction temperature is 60°C to 80°C;

[0110] The base can specifically be a 0.1 mol / L sodium hydroxide solution or potassium hydroxide solution;

[0111] The secondary reaction was carried out under alkaline conditions with a reaction time of 6 hours;

[0112] In this step, the internal silicon dioxide is etched, and at the same time, the internal zinc ions generate zinc hydroxide precipitation in the alkaline solution, so that silicon dioxide etching and zinc hydroxide precipitation are carried out simultaneously;

[0113] (III) Preparation of porous carbon materials loaded with zinc oxide:

[0114] Finally, the zinc-containing porous carbon precursor dispersion in step (2) is centrifuged, and the lower layer of precipitate is removed to obtain a zinc-containing porous carbon precursor; the lower layer of zinc-containing porous carbon precursor is aerobically calcined 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, and calcined in an oxygen-free state for 45 to 60 minutes, and naturally cooled to obtain a porous carbon material loaded with zinc oxide.

[0115] The spinning solvent is a surfactant and a solvent;

[0116] The surfactant content in the spinning solvent was 1200 ppm.

[0117] The surfactant is polyvinyl pyrrolidone.

[0118] The solvents are ethyl chloride, dichloromethane, 1,1-dichloro-2,2-difluoroethane, and 1,1,2,2,3,3,4,4-octafluorobutane, and the mass ratio of the four is 4:4:1:1.

[0119] Preparation of flash materials:

[0120] The prepared spinning solution is fed into the spinning chamber for flash spinning, and flash fibers are obtained through the nozzle of the spinning assembly. The flash fibers are then passed through a web laying and hot pressing process to obtain flash materials.

[0121] The temperature of flash spinning was 210°C;

[0122] The temperature of hot pressing was 110°C.

[0123] The performance test data of the flash vaporized material prepared in this example are shown in Table 1.

[0124] Example 3

[0125] This embodiment provides a flash vaporization material with low haze attenuation rate, which mainly includes the preparation of spinning solution and the preparation of flash vaporization material;

[0126] in:

[0127] Preparation of spinning solution: dissolving the spinning raw materials in the spinning solvent to obtain the spinning solution;

[0128] The spinning materials are polyethylene and porous carbon material loaded with zinc oxide;

[0129] The mass fraction of the porous carbon material loaded with zinc oxide in the spinning raw material is 6%;

[0130] The preparation method of the porous carbon material loaded with zinc oxide comprises the following specific technical steps:

[0131] (1) Preparation of solution of polyvinyl alcohol coated silica nanoparticles:

[0132] Adding silica nanoparticles to deionized water for ultrasonic dispersion to obtain a dispersion liquid, then adding polyvinyl alcohol powder to the dispersion liquid, while heating and stirring, controlling the heating temperature to 80°C to 100°C for dissolution and dispersion, after the polyvinyl alcohol solution is dissolved, reacting for 36 hours to 60 hours, and then filtering to remove undissolved polyvinyl alcohol to obtain a coating solution, thereby obtaining a solution in which the surface of the silica nanoparticles is coated with polyvinyl alcohol;

[0133] The mass ratio of silica nanoparticles to polyvinyl alcohol powder was 1:12;

[0134] (2) Preparation of zinc-containing porous carbon precursor dispersion

[0135] The solution of polyvinyl alcohol coated on the surface of the silica nanoparticles prepared in step (1) is then added to the aqueous zinc nitrate solution to continue the primary reaction, so that zinc and polyvinyl alcohol undergo a chelating reaction and are loaded on the surface of the silica nanoparticles. The pH value of the mixed solution is then slowly adjusted to 11-12 with an alkali, and a secondary reaction is continued under alkaline conditions to obtain a zinc-containing porous carbon precursor dispersion.

[0136] The primary reaction time is 48 hours, and the reaction temperature is 60°C to 80°C;

[0137] The base can specifically be a 0.1 mol / L sodium hydroxide solution or potassium hydroxide solution;

[0138] The secondary reaction was carried out under alkaline conditions with a reaction time of 8 hours;

[0139] In this step, the internal silicon dioxide is etched, and at the same time, the internal zinc ions generate zinc hydroxide precipitation in the alkaline solution, so that silicon dioxide etching and zinc hydroxide precipitation are carried out simultaneously;

[0140] (III) Preparation of porous carbon materials loaded with zinc oxide:

[0141] Finally, the zinc-containing porous carbon precursor dispersion in step (2) is centrifuged, and the lower layer of precipitate is removed to obtain a zinc-containing porous carbon precursor; the lower layer of zinc-containing porous carbon precursor is aerobically calcined 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, and calcined in an oxygen-free state for 45 to 60 minutes, and naturally cooled to obtain a porous carbon material loaded with zinc oxide.

[0142] The spinning solvent is a surfactant and a solvent;

[0143] The surfactant content in the spinning solvent was 2000 ppm.

[0144] The surfactant is polyvinyl pyrrolidone.

[0145] The solvents are ethyl chloride, dichloromethane, 1,1-dichloro-2,2-difluoroethane, and 1,1,2,2,3,3,4,4-octafluorobutane, and the mass ratio of the four is 4:4:1:1.

[0146] Preparation of flash materials:

[0147] The prepared spinning solution is fed into the spinning chamber for flash spinning, and flash fibers are obtained through the nozzle of the spinning assembly. The flash fibers are then passed through a web laying and hot pressing process to obtain flash materials.

[0148] The temperature of flash spinning was 220°C;

[0149] The temperature of hot pressing was 115°C.

[0150] The performance test data of the flash vaporized material prepared in this example are shown in Table 1.

[0151] Comparative Example 1

[0152] This comparative example provides a flash evaporated material, which mainly includes the preparation of spinning solution and the preparation of flash evaporated material;

[0153] in:

[0154] Preparation of spinning solution: dissolving the spinning raw materials in the spinning solvent to obtain the spinning solution;

[0155] The spinning material is polyethylene;

[0156] The spinning solvent is a surfactant and a solvent;

[0157] The surfactant content in the spinning solvent was 1200 ppm.

[0158] The surfactant is polyvinyl pyrrolidone.

[0159] The solvents are ethyl chloride, dichloromethane, 1,1-dichloro-2,2-difluoroethane, and 1,1,2,2,3,3,4,4-octafluorobutane, and the mass ratio of the four is 4:4:1:1.

[0160] Preparation of flash materials:

[0161] The prepared spinning solution is fed into the spinning chamber for flash spinning, and flash fibers are obtained through the nozzle of the spinning assembly. The flash fibers are then passed through a web laying and hot pressing process to obtain flash materials.

[0162] The temperature of flash spinning was 210°C;

[0163] The temperature of hot pressing was 110°C.

[0164] The performance test data of the flash vaporized material prepared in this comparative example are shown in Table 1.

[0165] Comparative Example 2

[0166] This comparative example provides a flash evaporated material, which mainly includes the preparation of spinning solution and the preparation of flash evaporated material;

[0167] in:

[0168] Preparation of spinning solution: dissolving the spinning raw materials in the spinning solvent to obtain the spinning solution;

[0169] The spinning materials are polyethylene and porous carbon material loaded with zinc oxide;

[0170] The mass fraction of the porous carbon material loaded with zinc oxide in the spinning raw material is 1%;

[0171] The preparation method of the porous carbon material loaded with zinc oxide is the same as that in Example 2.

[0172] The spinning solvent is a surfactant and a solvent;

[0173] The surfactant content in the spinning solvent was 1200 ppm.

[0174] The surfactant is polyvinyl pyrrolidone.

[0175] The solvents are ethyl chloride, dichloromethane, 1,1-dichloro-2,2-difluoroethane, and 1,1,2,2,3,3,4,4-octafluorobutane, and the mass ratio of the four is 4:4:1:1.

[0176] Preparation of flash materials:

[0177] The prepared spinning solution is fed into the spinning chamber for flash spinning, and flash fibers are obtained through the nozzle of the spinning assembly. The flash fibers are then passed through a web laying and hot pressing process to obtain flash materials.

[0178] The temperature of flash spinning was 210°C;

[0179] The temperature of hot pressing was 110°C.

[0180] The performance test data of the flash vaporized material prepared in this comparative example are shown in Table 1.

[0181] Comparative Example 3

[0182] This comparative example provides a flash evaporated material, which mainly includes the preparation of spinning solution and the preparation of flash evaporated material;

[0183] in:

[0184] Preparation of spinning solution: dissolving the spinning raw materials in the spinning solvent to obtain the spinning solution;

[0185] The spinning materials are polyethylene and porous carbon material loaded with zinc oxide;

[0186] The mass fraction of the porous carbon material loaded with zinc oxide in the spinning raw material is 2%;

[0187] The preparation method of the porous carbon material loaded with zinc oxide is the same as that in Example 2.

[0188] The spinning solvent is a surfactant and a solvent;

[0189] The surfactant content in the spinning solvent was 1200 ppm.

[0190] The surfactant is polyvinyl pyrrolidone.

[0191] The solvents are ethyl chloride, dichloromethane, 1,1-dichloro-2,2-difluoroethane, and 1,1,2,2,3,3,4,4-octafluorobutane, and the mass ratio of the four is 4:4:1:1.

[0192] Preparation of flash materials:

[0193] The prepared spinning solution is fed into the spinning chamber for flash spinning, and flash fibers are obtained through the nozzle of the spinning assembly. The flash fibers are then passed through a web laying and hot pressing process to obtain flash materials.

[0194] The temperature of flash spinning was 210°C;

[0195] The temperature of hot pressing was 110°C.

[0196] The performance test data of the flash vaporized material prepared in this comparative example are shown in Table 1.

[0197] Comparative Example 4

[0198] This comparative example provides a flash evaporated material, which mainly includes the preparation of spinning solution and the preparation of flash evaporated material;

[0199] in:

[0200] Preparation of spinning solution: dissolving the spinning raw materials in the spinning solvent to obtain the spinning solution;

[0201] The spinning materials are polyethylene and porous carbon material loaded with zinc oxide;

[0202] The mass fraction of the porous carbon material loaded with zinc oxide in the spinning raw material is 8%;

[0203] The preparation method of the porous carbon material loaded with zinc oxide is the same as that in Example 2.

[0204] The spinning solvent is a surfactant and a solvent;

[0205] The surfactant content in the spinning solvent was 1200 ppm.

[0206] The surfactant is polyvinyl pyrrolidone.

[0207] The solvents are ethyl chloride, dichloromethane, 1,1-dichloro-2,2-difluoroethane, and 1,1,2,2,3,3,4,4-octafluorobutane, and the mass ratio of the four is 4:4:1:1.

[0208] Preparation of flash materials:

[0209] The prepared spinning solution is fed into the spinning chamber for flash spinning, and flash fibers are obtained through the nozzle of the spinning assembly. The flash fibers are then passed through a web laying and hot pressing process to obtain flash materials.

[0210] The temperature of flash spinning was 210°C;

[0211] The temperature of hot pressing was 110°C.

[0212] The performance test data of the flash vaporized material prepared in this comparative example are shown in Table 1.

[0213] Comparative Example 5

[0214] This comparative example provides a flash evaporated material, which mainly includes the preparation of spinning solution and the preparation of flash evaporated material;

[0215] in:

[0216] Preparation of spinning solution: dissolving the spinning raw materials in the spinning solvent to obtain the spinning solution;

[0217] The spinning materials are polyethylene and porous carbon material loaded with zinc oxide;

[0218] The mass fraction of the porous carbon material loaded with zinc oxide in the spinning raw material is 9%;

[0219] The preparation method of the porous carbon material loaded with zinc oxide is the same as that in Example 2.

[0220] The spinning solvent is a surfactant and a solvent;

[0221] The surfactant content in the spinning solvent was 1200 ppm.

[0222] The surfactant is polyvinyl pyrrolidone.

[0223] The solvents are ethyl chloride, dichloromethane, 1,1-dichloro-2,2-difluoroethane, and 1,1,2,2,3,3,4,4-octafluorobutane, and the mass ratio of the four is 4:4:1:1.

[0224] Preparation of flash materials:

[0225] The prepared spinning solution is fed into the spinning chamber for flash spinning, and flash fibers are obtained through the nozzle of the spinning assembly. The flash fibers are then passed through a web laying and hot pressing process to obtain flash materials.

[0226] The temperature of flash spinning was 210°C;

[0227] The temperature of hot pressing was 110°C.

[0228] The performance test data of the flash vaporized material prepared in this comparative example are shown in Table 1.

[0229] Comparative Example 6

[0230] This comparative example provides a flash evaporated material, which mainly includes the preparation of spinning solution and the preparation of flash evaporated material;

[0231] in:

[0232] Preparation of spinning solution: dissolving the spinning raw materials in the spinning solvent to obtain the spinning solution;

[0233] The spinning materials are polyethylene and porous carbon material loaded with zinc oxide;

[0234] The mass fraction of the porous carbon material loaded with zinc oxide in the spinning raw material is 4.5%;

[0235] The preparation method of the porous carbon material loaded with zinc oxide is the same as that in Example 2.

[0236] The spinning solvent is a solvent;

[0237] The solvents are ethyl chloride, dichloromethane, 1,1-dichloro-2,2-difluoroethane, and 1,1,2,2,3,3,4,4-octafluorobutane, and the mass ratio of the four is 4:4:1:1.

[0238] Preparation of flash materials:

[0239] The prepared spinning solution is fed into the spinning chamber for flash spinning, and flash fibers are obtained through the nozzle of the spinning assembly. The flash fibers are then passed through a web laying and hot pressing process to obtain flash materials.

[0240] The temperature of flash spinning was 210°C;

[0241] The temperature of hot pressing was 110°C.

[0242] The performance test data of the flash vaporized material prepared in this comparative example are shown in Table 1.

[0243] Comparative Example 7

[0244] This comparative example provides a flash evaporated material, which mainly includes the preparation of spinning solution and the preparation of flash evaporated material;

[0245] in:

[0246] Preparation of spinning solution: dissolving the spinning raw materials in the spinning solvent to obtain the spinning solution;

[0247] The spinning materials are polyethylene and porous carbon material loaded with zinc oxide;

[0248] The mass fraction of the porous carbon material loaded with zinc oxide in the spinning raw material is 4.5%;

[0249] The preparation method of the porous carbon material loaded with zinc oxide is the same as that in Example 2.

[0250] The spinning solvent is a surfactant and a solvent;

[0251] The surfactant was present in the spinning solvent at 200 ppm.

[0252] The surfactant is polyvinyl pyrrolidone.

[0253] The solvents are ethyl chloride, dichloromethane, 1,1-dichloro-2,2-difluoroethane, and 1,1,2,2,3,3,4,4-octafluorobutane, and the mass ratio of the four is 4:4:1:1.

[0254] Preparation of flash materials:

[0255] The prepared spinning solution is fed into the spinning chamber for flash spinning, and flash fibers are obtained through the nozzle of the spinning assembly. The flash fibers are then passed through a web laying and hot pressing process to obtain flash materials.

[0256] The temperature of flash spinning was 210°C;

[0257] The temperature of hot pressing was 110°C.

[0258] The performance test data of the flash vaporized material prepared in this comparative example are shown in Table 1.

[0259] Comparative Example 8

[0260] This comparative example provides a flash evaporated material, which mainly includes the preparation of spinning solution and the preparation of flash evaporated material;

[0261] in:

[0262] Preparation of spinning solution: dissolving the spinning raw materials in the spinning solvent to obtain the spinning solution;

[0263] The spinning materials are polyethylene and porous carbon material loaded with zinc oxide;

[0264] The mass fraction of the porous carbon material loaded with zinc oxide in the spinning raw material is 4.5%;

[0265] The preparation method of the porous carbon material loaded with zinc oxide is the same as that in Example 2.

[0266] The spinning solvent is a surfactant and a solvent;

[0267] The surfactant content in the spinning solvent was 2000 ppm.

[0268] The surfactant is polyvinyl pyrrolidone.

[0269] The solvents are ethyl chloride, dichloromethane, 1,1-dichloro-2,2-difluoroethane, and 1,1,2,2,3,3,4,4-octafluorobutane, and the mass ratio of the four is 4:4:1:1.

[0270] Preparation of flash materials:

[0271] The prepared spinning solution is fed into the spinning chamber for flash spinning, and flash fibers are obtained through the nozzle of the spinning assembly. The flash fibers are then passed through a web laying and hot pressing process to obtain flash materials.

[0272] The temperature of flash spinning was 210°C;

[0273] The temperature of hot pressing was 110°C.

[0274] The performance test data of the flash vaporized material prepared in this comparative example are shown in Table 1.

[0275] Table 1 Performance test data of flash evaporation materials

[0276] Results Analysis: Comparing the above data, it can be seen that increasing the amount of zinc oxide-loaded porous carbon material in the spinning feedstock reduces the haze attenuation rate and the heat shielding rate attenuation rate, but the rate of reduction slows significantly after reaching a certain level. Increasing the amount of surfactant in the spinning solvent also reduces the haze attenuation rate and the heat shielding rate attenuation rate, but the rate of reduction also slows significantly after reaching a certain level.

[0277] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope of the appended claims.

Claims

1. A flash evaporation material with low haze attenuation rate, characterized in that: The raw material of the flash spun material contains polyethylene, and the weight of the flash spun nonwoven fabric is greater than 35g / m 2 , The compression ratio P of the flash material is greater than 0.07 gf·cm / cm 2 ; The compression ratio work is tested by KES style tester, and the compression ratio work is tested by FB3; The fog attenuation rate △W of the flash vapor material is 0.3% to 1.5%; △W=(W0-W5) / W0*100%; The heat shielding rate attenuation rate △S of the flash evaporation material is 7% to 15%; △S=(S0-S5) / S0*100%; Tests of heat shielding rate, haze and transverse tensile strength: (1) The sample is placed at 25°C and 65% relative humidity for 24 hours; then its shading index is measured and recorded as the initial heat shielding rate S0, its haze is measured and recorded as the initial haze W0, and its transverse tensile strength is measured and recorded as the transverse tensile strength CTS0; (2) then exposed to a dry heat atmosphere at 90°C for 6 hours, and then cooled for 24 hours at 25°C and 65% relative humidity; (3) Repeat the operation of step (2) for another 4 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; The haze is tested according to the national standard GB / T2410-2008; The heat shielding rate is measured according to the national standard GB / T41560-2022.

2. A flash evaporation material with low haze attenuation rate as claimed in claim 1, characterized in that: The weight of flash spun nonwoven fabric is less than 75g / m 2 .

3. A flash evaporation material with low haze attenuation rate as claimed in claim 1, characterized in that: The compression ratio P of flash spun nonwoven fabric is greater than 0.15gf·cm / cm 2 .

4. A flash evaporation material with low haze attenuation rate as claimed in claim 1, characterized in that: The haze attenuation rate ΔW of the flash evaporated material is 0.6% to 0.9%.

5. A flash evaporation material with low haze attenuation rate as claimed in claim 1, characterized in that the haze attenuation rate ΔW of the flash evaporation material is 0.9% to 1.3%.

6. A flash evaporation material with low haze attenuation rate as claimed in claim 1, characterized in that: The heat shielding rate of the flash material has a decay rate of 7% to 10%.

7. A flash evaporation material with low haze attenuation rate as claimed in claim 1, characterized in that: The heat shielding rate of the flash material has a decay rate of 10% to 14%.

8. The flash evaporation material with low haze attenuation rate according to claim 1, characterized in that: The transverse tensile strength attenuation rate △CTS of the flash evaporated material is 2% to 10%; △CTS=(CTS0-CTS5) / CTS0*100%; The transverse tensile strength CTS0 is greater than 1.4KN / m.

9. A flash evaporation material with low haze attenuation rate as claimed in claim 8, characterized in that: The transverse tensile strength attenuation rate △CTS of the flash evaporated material is 3% to 5%.

10. A flash evaporation material with low haze attenuation rate as claimed in claim 8, characterized in that: The transverse tensile strength attenuation rate △CTS of the flash evaporated material is 5% to 7%.

11. The flash evaporation material with low haze attenuation rate according to claim 1, characterized in that: The spinning raw materials are polyethylene and porous carbon material loaded with zinc oxide, and the spinning solvents are surfactant and solvent.

12. A flash evaporation material with low haze attenuation rate as claimed in claim 11, characterized in that: The mass fraction of the porous carbon material loaded with zinc oxide in the spinning raw material is 3% to 6%; The surfactant is contained in the spinning solvent at 500 ppm to 2000 ppm.

13. A flash evaporation material with low haze attenuation rate as claimed in claim 11, characterized in that: The porous carbon material loaded with zinc oxide is prepared by the following steps: (I) Preparation of solution of polyvinyl alcohol coated on the surface of silica nanoparticles: (II) Preparation of zinc-containing porous carbon precursor dispersion: Then, the solution of polyvinyl alcohol coated on the surface of the silicon dioxide nanoparticles prepared in step (i) is added to the zinc nitrate aqueous solution to continue the primary reaction, so that zinc and polyvinyl alcohol undergo a chelating reaction and are loaded on the surface of the silicon dioxide nanoparticles, and then the mixture is slowly regulated with an alkali. The pH value of the solution is 11-12, and the secondary reaction is continued under alkaline conditions to obtain a zinc-containing porous carbon precursor dispersion; (III) Preparation of porous carbon materials loaded with zinc oxide: Finally, the zinc-containing porous carbon precursor dispersion in step (ii) is centrifuged to remove the lower layer of precipitate to obtain a zinc-containing porous carbon precursor; the lower layer of zinc-containing porous carbon precursor is aerobically calcined 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, and calcined without oxygen for 45 to 60 minutes, and naturally cooled to obtain a porous carbon material loaded with zinc oxide.

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