A kind of polyester flash nonwoven fabric and preparation method thereof

Abstract

The present invention relates to a polyester flash non-woven fabric and a preparation method thereof, and belongs to the technical field of non-woven fabrics. The preparation method is as follows: polyester particles, polyethylene particles, zinc oxide, a compatibilizer and an antioxidant are added to an extruder to extrude modified particles, the modified particles are ground to obtain ultrafine powders; the ultrafine powders and solvents are added to an autoclave, stirred and dissolved under heating and pressurization conditions to form a uniform polyester solution; the uniform polyester solution is cooled to a spinning temperature, and supercritical carbon dioxide gas is introduced to form a uniform flash spinning solution; the spinning pressure is controlled to spin, and the net is laid by electrostatic separation, and the residual solvent is treated by hot air to obtain a mesh, and the mesh is preheated by three-level infrared, and finally the polyester flash non-woven fabric is obtained by hot pressing. The obtained non-woven fabric has better strength than traditional polyethylene non-woven fabrics, good air permeability, good antibacterial properties, and excellent comprehensive performance.

Description

Technical Field

[0001] The invention relates to a polyester flash nonwoven fabric and a preparation method thereof, belonging to the technical field of nonwoven fabrics. Background Art

[0002] Polyethylene flash non-woven fabric is made of polyethylene through flash spinning process to produce continuous long fibers. The long fibers are swung, webbed and hot pressed to form non-woven fabric. The continuous long fibers are multi-directional, cross-woven and stacked to form a web. Its unique structure makes it have excellent antibacterial properties and has many applications in medical protection. At present, in medical protection, people have relatively high requirements for antibacterial and breathable properties.

[0003] Polyester non-woven fabrics are wear-resistant, tensile-resistant, breathable, and have the advantages of chemical corrosion resistance and heat resistance. However, common polyester particles cannot be used for flash evaporation preparation. The main reason is that common polyester has a high melting point and is difficult to melt and dissolve in halogenated hydrocarbons at low temperatures. The dissolution temperature is generally above 240°C. At this temperature, the solubility of supercritical gas in resin is reduced. Due to the large temperature difference, it is difficult to connect the filaments to form long fibers after flash spinning. It is impossible to form a multi-layer three-dimensional network structure, and it can only form a relatively broken powder. After hot pressing, the finished product of this structure has low strength and poor comprehensive performance.

[0004] Chinese patent application CN117867753A discloses a regenerated flash nonwoven fabric and a preparation method thereof. Regenerated polyethylene is used as the main material, and conventional polyethylene, modified polyester, cyclodextrin modified shell powder and calcium stearate are added to make a nonwoven fabric by flash evaporation. The proportion of polyester added in this technology is very low, and the nonwoven fabric is mainly made of polyethylene, which cannot meet higher air permeability requirements. Chinese patent application CN113186654A discloses a polyester meltblown nonwoven fabric and a preparation method thereof. This technology uses polyester to make a meltblown nonwoven fabric, and the preparation efficiency is relatively low. Therefore, it is of great value to develop a more efficient flash evaporation method for preparing polyester nonwoven fabrics with excellent air permeability, strength and antibacterial properties. Summary of the invention

[0005] The present invention aims at the deficiencies in the prior art and provides a polyester flash-steamed nonwoven fabric and a preparation method thereof. The preparation method of the polyester flash-steamed nonwoven fabric can solve the problem of difficulty in dissolving polyester and make up for the vacancy of polyester materials for flash spinning. The prepared polyester flash-steamed nonwoven fabric has the comprehensive properties of high tensile strength, good air permeability and excellent antibacterial performance.

[0006] The technical solution of the present invention to solve the above technical problems is as follows: a method for preparing a polyester flash nonwoven fabric, the preparation method comprising:

[0007] S1. Polyester particle modification:

[0008] Adding polyester particles, polyethylene particles, zinc oxide, a compatibilizer and an antioxidant into an extruder to extrude modified particles, and grinding the modified particles to obtain ultrafine powder;

[0009] S2, high temperature and low pressure dissolving polyester:

[0010] The ultrafine powder and solvent are added into an autoclave, and stirred and dissolved under heating and pressurization conditions to form a uniform polyester solution;

[0011] S3, preparing flash spinning solution:

[0012] The uniform polyester solution obtained in step S2 is cooled to the spinning temperature, and supercritical carbon dioxide gas is introduced and stirred to form a uniform flash spinning solution;

[0013] S4, non-woven fabric forming:

[0014] The spinning pressure is controlled to spin the yarn, the yarn is separated and laid through electrostatic separation, the residual solvent is treated by hot air to obtain a mesh, the mesh is preheated by three-level infrared, and finally the polyester flash non-woven fabric is obtained by hot pressing.

[0015] Furthermore, in terms of weight fraction, the polyester particles are 70-100 parts, the polyethylene particles are 0-30 parts, the compatibilizer is 3-5 parts, and the antioxidant is 0.5-2 parts; the amount of zinc oxide is 0.5%-5% of the mass of the polyester particles.

[0016] Further, the melting point of the polyester particles is 220-240°C, and the number average molecular weight is 20,000-30,000;

[0017] The polyethylene particles are high-density polyethylene with a melting point of 130-135°C and a number average molecular weight of 100,000-150,000;

[0018] The compatibilizer is at least one of EAA, EVA, and POE;

[0019] The antioxidant is at least one of antioxidant 168 and antioxidant 1010;

[0020] The solvent is one or more of aliphatic hydrocarbons, unsaturated hydrocarbons, and halogenated hydrocarbons.

[0021] Furthermore, the specific operation of step S1 polyester particle modification is:

[0022] The polyester particles, polyethylene particles, zinc oxide, compatibilizer and antioxidant are melt-blended at 240-250° C. through a twin-screw extruder, and the outlet of the extruder enters the cooling water of a mold temperature controller at a speed of 50-100 m / min and is rapidly cooled at a speed of 30-60° C. / s, and is cut to obtain modified particles; the modified particles enter a grinder and are ground to obtain ultrafine powder;

[0023] The particle size of the ultrafine powder is 2-20um, the crystallinity is 10-40%, and the density is 1.30-1.40g / cm 3 .

[0024] Furthermore, in step S2, the mass proportion of the ultrafine powder in the uniform polyester solution is 15-20%;

[0025] During the dissolution process of step S2, an inert gas is introduced to promote dissolution, and the mass of the inert gas introduced is 1-5% of the volume of the solvent;

[0026] The temperature condition of the high temperature and low pressure dissolution is 230-240° C., the pressure condition is 1-3 Mpa, the stirring time is 60-120 min, and the stirring speed is 50-70 rpm.

[0027] Furthermore, in step S3, the mass of supercritical carbon dioxide introduced is 10-20% of the mass of the solvent;

[0028] In step S3, the spinning temperature is 180-190° C., and the stirring speed is 100-150 rpm.

[0029] Further, in step S4, the spinning pressure is 9-11 MPa;

[0030] The voltage of the electrostatic wire laying is controlled at 30000-50000V.

[0031] Further, in step S4, the three-level infrared heating conditions are: the first-level red temperature heating temperature is 60-80°C, the second-level red temperature heating temperature is 80-100°C, and the third-level red temperature heating temperature is 100°C-120°C;

[0032] The temperature difference between the second level red temperature heating and the first level red temperature heating is not less than 5°C and not more than 25°C, and the temperature difference between the third level red temperature heating and the second level red temperature heating is not less than 5°C and not more than 25°C.

[0033] Furthermore, in step S4, the pressure during hot pressing is 5-30 N / mm and the temperature is 230-250°C.

[0034] The invention also discloses a polyester flash-steamed non-woven fabric, which is prepared by adopting the preparation method of the invention.

[0035] The beneficial effects of the present invention are:

[0036] The present invention uses polyester as a main raw material, adjusts the density of modified particles by polyethylene, and regulates the degree of crystallization of the modified polyester by quenching crystallization, thereby effectively reducing the crystallinity of the polyester. The modified polyester prepared by the present invention has low crystallinity, and the polyester is more easily dissolved during the dissolution process, and the molecular chains are more easily disentangled, thereby preparing a uniform spinning solution.

[0037] Traditional flash spinning methods all use polyethylene as the main raw material. The present invention uses a two-step method for flash spinning of polyester. First, it is completely dissolved in a high temperature and low pressure state to form a uniform and stable solution. Then, supercritical gas is inhaled under low temperature and high pressure to form a uniform flash spinning solution. Long fibers with a mesh structure are formed by flash spinning. The present invention overcomes the difficulty of dissolving polyester and fills the gap in the use of polyester materials for flash spinning.

[0038] The polyester flash nonwoven fabric prepared by the preparation method of the present invention exhibits comprehensive excellent performance in terms of tensile strength, air permeability and antibacterial performance, and can be applied in the field of medical protection. DETAILED DESCRIPTION

[0039] In order to make the above-mentioned purpose, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0040] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0041] A method for preparing a polyester flash nonwoven fabric, the preparation method comprising:

[0042] S1. Polyester particle modification:

[0043] Adding polyester particles, polyethylene particles, zinc oxide, a compatibilizer and an antioxidant into an extruder to extrude modified particles, and grinding the modified particles to obtain ultrafine powder;

[0044] S2, high temperature and low pressure dissolving polyester:

[0045] The ultrafine powder and solvent are added into an autoclave, and stirred and dissolved under heating and pressurization conditions to form a uniform polyester solution;

[0046] S3, preparing flash spinning solution:

[0047] The uniform polyester solution obtained in step S2 is cooled to the spinning temperature, and supercritical carbon dioxide gas is introduced (the role of carbon dioxide gas is to promote fiber formation), and stirred to form a uniform flash spinning solution;

[0048] S4, non-woven fabric forming:

[0049] The spinning pressure is controlled to spin the yarn, the yarn is separated and laid through electrostatic separation, the residual solvent is treated by hot air to obtain a mesh, the mesh is preheated by three-level infrared, and finally the polyester flash non-woven fabric is obtained by hot pressing.

[0050] Specifically, according to weight fraction, the polyester particles are 70-100 parts, the polyethylene particles are 0-30 parts, the compatibilizer is 3-5 parts, and the antioxidant is 0.5-2 parts; the amount of zinc oxide is 0.5%-5% of the mass of the polyester particles.

[0051] Specifically, the melting point of the polyester particles is 220-240°C, and the number average molecular weight is 20,000-30,000;

[0052] The polyethylene particles are high-density polyethylene with a melting point of 130-135°C and a number average molecular weight of 100,000-150,000;

[0053] The compatibilizer is at least one of EAA, EVA, and POE;

[0054] The antioxidant is at least one of antioxidant 168 and antioxidant 1010;

[0055] The solvent is one or more of aliphatic hydrocarbons, unsaturated hydrocarbons, and halogenated hydrocarbons.

[0056] More specifically, the polyester particles used in the embodiment of the present invention are Shanghai Yuanfang CH-610, and the polyethylene particles are Yangzi Petrochemical 5000s. However, this is not a limitation to the technical solution of the present invention.

[0057] Specifically, the specific operation of step S1 polyester particle modification is:

[0058] The polyester particles, polyethylene particles, zinc oxide, compatibilizer and antioxidant are melt-blended at 240-250° C. through a twin-screw extruder, and the outlet of the extruder enters the cooling water of a mold temperature controller at a speed of 50-100 m / min and is rapidly cooled at a speed of 30-60° C. / s, and is cut to obtain modified particles; the modified particles enter a grinder and are ground to obtain ultrafine powder;

[0059] The particle size of the ultrafine powder is 2-20um, the crystallinity is 10-40%, and the density is 1.30-1.40g / cm 3 .

[0060] Specifically, in step S2, the mass proportion of the ultrafine powder in the uniform polyester solution is 15-20%;

[0061] During the dissolution process of step S2, an inert gas is introduced to promote dissolution, and the mass of the inert gas introduced is 1-5% of the mass of the solvent;

[0062] The temperature condition of the high temperature and low pressure dissolution is 230-240° C., the pressure condition is 1-3 Mpa, the stirring time is 60-120 min, and the stirring speed is 50-70 rpm.

[0063] More specifically, the inert gas is at least one of nitrogen, helium, neon, argon, krypton, and xenon.

[0064] Specifically, in step S3, the mass of supercritical carbon dioxide introduced is 10-20% of the mass of the solvent;

[0065] In step S3, the spinning temperature is 180-190° C., and the stirring speed is 100-150 rpm.

[0066] Specifically, in step S4, the spinning pressure is 9-11 MPa;

[0067] The voltage of the electrostatic wire laying is controlled at 30000-50000V.

[0068] Specifically, in step S4, the three-level infrared heating conditions are: the first-level red temperature heating temperature is 60-80°C, the second-level red temperature heating temperature is 80-100°C, and the third-level red temperature heating temperature is 100°C-120°C;

[0069] The temperature difference between the second level red temperature heating and the first level red temperature heating is not less than 5°C and not more than 25°C, and the temperature difference between the third level red temperature heating and the second level red temperature heating is not less than 5°C and not more than 25°C.

[0070] Specifically, in step S4, the pressure during hot pressing is 5-30 N / mm and the temperature is 230-250°C.

[0071] A polyester flash-steamed nonwoven fabric is prepared by adopting the preparation method of the present invention.

[0072] Example 1

[0073] A polyester flash nonwoven fabric, the preparation method of the polyester nonwoven fabric comprising the following steps:

[0074] S1. Polyester particle modification:

[0075] According to the weight proportions, 90 parts of polyester particles, 10 parts of high-density polyethylene particles, 3 parts of compatibilizer EAA, 0.5 parts of antioxidant 168 and zinc oxide (3% of the mass of polyester particles) are melt-blended at 240°C through a twin-screw extruder. The outlet of the extruder enters the cooling water of the mold temperature controller at a speed of 100m / min and is rapidly cooled at a speed of 40°C / s. The cooling water temperature is 5°C. The particles are cut by a cutter and ground into ultrafine powder in a grinder. The particle size of the ultrafine powder is 2-20um.

[0076] S2, high temperature and low pressure dissolving polyester:

[0077] The ultrafine powder of modified polyester is put into a high-pressure reactor A, and chloroform and dichloromethane are added, wherein the mass ratio of dichloromethane to chloroform is 4:1, the solid content of the ultrafine powder is 15%, and an inert gas of 5% by mass of the solvent is added. The temperature is raised to 235°C, and the pressure is maintained at 2-3MPa and the stirring speed is 50rpm for 90 minutes to form a uniform polyester solution.

[0078] S3, low temperature and high pressure preparation of flash spinning solution:

[0079] The uniform polyester solution in the autoclave A is transferred to the autoclave B. The temperature in the autoclave B is 180°C. Supercritical carbon dioxide gas with a mass percentage of 15% of the solvent is added to the autoclave B. The mixture is stirred at 120 rpm for 0.5 h to form a uniform flash spinning solution.

[0080] S4, non-woven fabric forming:

[0081] The yarn was spun at a pressure of 10 MPa, and then electrostatically separated and laid. The electrostatic voltage was controlled at 50,000 V, and the residual solvent was treated by hot air. The mesh was preheated by three levels of infrared, and the temperatures of the three levels of infrared preheating were 60°C, 80°C, and 100°C, respectively, so that the residual solvent could be removed. The polyester flash nonwoven fabric was obtained at a hot pressing temperature of 240°C and a pressure of 5 N / mm.

[0082] Example 2

[0083] A polyester flash nonwoven fabric, the preparation method of the polyester nonwoven fabric comprising the following steps:

[0084] S1. Polyester particle modification:

[0085] According to the weight proportions, 80 parts of polyester particles, 20 parts of high-density polyethylene particles, 5 parts of compatibilizer EAA, 0.5 parts of antioxidant 168 and zinc oxide (3% of the mass of polyester particles) are melt-blended at 250°C through a twin-screw extruder. The outlet of the extruder enters the cooling water of the mold temperature controller at a speed of 50m / min and is rapidly cooled at a speed of 60°C / s. The cooling water temperature is 5°C. The particles are cut by a cutter and then enter a grinder to be ground into ultrafine powder with a particle size of 2-20um.

[0086] S2, high temperature and low pressure dissolving polyester:

[0087] The ultrafine powder of modified polyester is put into high-pressure reactor A, and chloroform and dichloromethane are added. The mass ratio of dichloromethane to chloroform is 4:1, the solid content of the ultrafine powder is 15%, and 5% of the solvent mass of inert gas is added. The temperature is raised to 235°C, and the pressure is 2-3MPa and the stirring speed is 50rpm for 70 minutes. At this time, the polyester is completely dissolved to form a uniform polyester solution.

[0088] S3, low temperature and high pressure preparation of flash spinning solution:

[0089] The uniform polyester solution in the autoclave A was transferred to the autoclave B. The temperature in the autoclave B was 190°C. Supercritical carbon dioxide gas with a mass percentage of 15% of the solvent was added to the autoclave B. The mixture was stirred at 130 rpm for 0.5 h to form a uniform flash spinning solution.

[0090] S4, non-woven fabric forming:

[0091] The spinning was carried out under a pressure of 11 MPa, and the electrostatic filaments were spread and laid. The electrostatic voltage was controlled at 30,000 V, and the residual solvent was treated by hot air. The mesh was subjected to three-level infrared preheating, and the temperatures of the three-level infrared preheating were 60°C, 80°C, and 100°C, respectively, so that the residual solvent could be removed. The hot pressing temperature was 240°C and the pressure was 5N / mm to obtain a polyester flash nonwoven fabric.

[0092] Example 3

[0093] A polyester flash nonwoven fabric, the preparation method of the polyester nonwoven fabric comprising the following steps:

[0094] S1. Polyester particle modification:

[0095] According to the weight proportions, 70 parts of polyester particles, 30 parts of high-density polyethylene particles, 3 parts of compatibilizer EVA, 2 parts of antioxidant 1010 and zinc oxide (0.5% of the mass of polyester particles) are melt-blended at 245°C through a twin-screw extruder. The outlet of the extruder enters the cooling water of a mold temperature controller at a speed of 100m / min and is rapidly cooled at a speed of 30°C / s. The cooling water temperature is 5°C. Particles are obtained by a cutter and then enter a grinder for grinding to obtain ultrafine powder with a particle size of 2-20um.

[0096] S2, high temperature and low pressure dissolving polyester:

[0097] The ultrafine powder of modified polyester is put into high-pressure reactor A, and chloroform and dichloromethane are added. The mass ratio of dichloromethane to chloroform is 4:1, the solid content of the ultrafine powder is 15%, and 1% of the solvent mass of inert gas is added. The temperature is raised to 240°C, and the pressure is 2-3MPa and the stirring speed is 70rpm for 60 minutes. At this time, the polyester is completely dissolved to form a uniform polyester solution.

[0098] S3, low temperature and high pressure preparation of flash spinning solution:

[0099] The uniform polyester solution in the autoclave A was transferred to the autoclave B. The temperature in the autoclave B was 180°C. Supercritical carbon dioxide gas with a mass percentage of 10% of the solvent was added to the autoclave B. The mixture was stirred at 130 rpm for 0.5 h to form a uniform flash spinning solution.

[0100] S4, non-woven fabric forming:

[0101] The yarn was spun at a pressure of 9 MPa, and the electrostatic wire was spread and the electrostatic voltage was controlled at 40,000 V. The residual solvent was treated by hot air. The mesh was preheated by three levels of infrared, and the temperatures of the three levels of infrared preheating were 60°C, 80°C, and 100°C, respectively, to remove the residual solvent. The hot pressing temperature was 250°C and the pressure was 30 N / mm to obtain the polyester flash nonwoven fabric.

[0102] Example 4

[0103] A polyester flash nonwoven fabric, the preparation method of the polyester nonwoven fabric comprising the following steps:

[0104] S1. Polyester particle modification:

[0105] According to the weight proportions, 100 parts of polyester particles, 3 parts of compatibilizer POE, 0.5 parts of antioxidant 1010 and zinc oxide (3% of the weight of polyester particles) are melt-blended at 250°C through a twin-screw extruder. The outlet of the extruder enters the cooling water of the mold temperature controller at a speed of 80m / min and is rapidly cooled at a speed of 40°C / s. The cooling water temperature is 5°C. Particles are obtained by a cutter and then enter a grinder for grinding to obtain ultrafine powder with a particle size of 2-20um.

[0106] S2, high temperature and low pressure dissolving polyester:

[0107] The ultrafine powder of modified polyester is put into high-pressure reactor A, and chloroform and dichloromethane are added. The mass ratio of dichloromethane to chloroform is 4:1, the solid content of the ultrafine powder is 20%, and 5% inert gas by mass of the solvent is added. The temperature is raised to 230°C, and the pressure is 2-3MPa and the stirring speed is 50rpm. Maintain 120min, at this time, the polyester has been completely dissolved to form a uniform polyester solution.

[0108] S3, low temperature and high pressure preparation of flash spinning solution:

[0109] The uniform polyester solution in the autoclave A is transferred to the autoclave B. The temperature in the autoclave B is 190°C. Supercritical carbon dioxide gas with a mass percentage of 10% of the solvent is added to the autoclave B. The mixture is stirred at 120 rpm for 0.5 h to form a uniform flash spinning solution.

[0110] S4, non-woven fabric forming:

[0111] The spinning was carried out at a pressure of 9MPa, and the electrostatic wire laying was carried out. The electrostatic voltage was controlled at 30000V, and the residual solvent was treated by hot air. The mesh was subjected to three-level infrared preheating, and the temperatures of the three-level infrared preheating were 80℃, 100℃, and 120℃, respectively, so that the residual solvent could be removed. The hot pressing temperature was 230℃ and the pressure was 5N / mm to obtain the polyester flash nonwoven fabric.

[0112] Example 5

[0113] A polyester flash nonwoven fabric, the preparation method of the polyester nonwoven fabric comprising the following steps:

[0114] S1. Polyester particle modification:

[0115] According to the weight proportions, 80 parts of polyester particles, 20 parts of high-density polyethylene particles, 3 parts of compatibilizer EAA, 0.5 parts of antioxidant 168 and zinc oxide (3% of the mass of polyester particles) are melt-blended at 240°C through a twin-screw extruder. The outlet of the extruder enters the cooling water of the mold temperature controller at a speed of 100m / min and is rapidly cooled at a speed of 30°C / s. The cooling water temperature is 10°C. The particles are obtained by a cutter and enter a grinder for grinding. The particle size of the ultrafine powder is 10-20um.

[0116] S2, high temperature and low pressure dissolving polyester:

[0117] The ultrafine powder of modified polyester is put into high-pressure reactor A, and chloroform and dichloromethane are added. The mass ratio of dichloromethane to chloroform is 4:1, the solid content of the ultrafine powder is 15%, and 5% of the solvent mass of inert gas is added. The temperature is raised to 235°C, and the pressure is 2-3MPa and the stirring speed is 50rpm for 120min. At this time, the polyester is completely dissolved to form a uniform polyester solution.

[0118] S3, low temperature and high pressure preparation of flash spinning solution:

[0119] The uniform polyester solution in the autoclave A is transferred to the autoclave B. The temperature in the autoclave B is 180°C. Supercritical carbon dioxide gas with a dissolution mass of 15% is added into the autoclave B. The mixture is stirred at 130 rpm for 0.5 h to form a uniform flash spinning solution.

[0120] S4, non-woven fabric forming:

[0121] The spinning was carried out at a pressure of 9MPa, and the electrostatic filaments were laid on the net. The electrostatic voltage was controlled at 50000V, and the residual solvent was treated by hot air. The net was preheated by three levels of infrared, and the temperatures of the three levels of infrared preheating were 70℃, 85℃, and 105℃, respectively, so that the residual solvent could be removed. The hot pressing temperature was 250℃ and the pressure was 10N / mm to obtain the polyester flash nonwoven fabric.

[0122] Comparative Example 1

[0123] The polyester flash nonwoven fabric was prepared by the same method as in Example 1, except that: the flash spinning solution was prepared by a one-step dissolution method in this comparative example 1, and the specific preparation process was as follows:

[0124] S1. Polyester particle modification:

[0125] According to the weight proportions, 90 parts of polyester particles, 10 parts of high-density polyethylene particles, 3 parts of compatibilizer EAA, 0.5 parts of antioxidant 168 and zinc oxide (3% of the mass of polyester particles) are melt-blended at 240°C through a twin-screw extruder. The outlet of the extruder enters the cooling water of the mold temperature controller at a speed of 100m / min and is rapidly cooled at a speed of 40°C / s. The cooling water temperature is 5°C. The particles are cut by a cutter and ground into ultrafine powder in a grinder. The particle size of the ultrafine powder is 2-20um.

[0126] S2, preparing flash spinning solution:

[0127] The ultrafine powder of modified polyester is put into a high-pressure reactor A, and chloroform and dichloromethane are added, wherein the mass ratio of dichloromethane to chloroform is 4:1, the solid content of the ultrafine powder is 15%, and supercritical carbon dioxide of 15% by mass of the solvent is added. The temperature is raised to 250°C, and the pressure is 10-14MPa and the stirring speed is 120-130rpm for 80 minutes to form a spinning solution.

[0128] S3, non-woven fabric forming:

[0129] The yarn was spun at a pressure of 14 MPa, and then electrostatically separated and laid. The electrostatic voltage was controlled at 50,000 V, and the residual solvent was treated by hot air. The mesh was preheated by three levels of infrared, and the temperatures of the three levels of infrared preheating were 60°C, 80°C, and 100°C, respectively, so that the residual solvent could be removed. The polyester flash nonwoven fabric was obtained at a hot pressing temperature of 240°C and a pressure of 5 N / mm.

[0130] Comparative Example 2

[0131] The polyester flash nonwoven fabric was prepared by the same method as in Example 1, except that: in the preparation process of this comparative example 2, the particles were not ground into ultrafine powder in step S1. The specific preparation process is as follows:

[0132] S1. Polyester particle modification:

[0133] According to the weight proportions, 90 parts of polyester granules, 10 parts of high-density polyethylene granules, 3 parts of compatibilizer EAA, 0.5 parts of antioxidant 168 and zinc oxide (3% of the mass of polyester granules) were melt-blended at 240°C through a twin-screw extruder. The outlet of the extruder entered the cooling water of a mold temperature controller at a speed of 100m / min and was rapidly cooled at a speed of 40°C / s. The cooling water temperature was 5°C and the granules were obtained by cutting with a knife.

[0134] S2, high temperature and low pressure dissolving polyester:

[0135] The particles obtained in step S1 are put into a high-pressure reactor A, and chloroform and dichloromethane are added, wherein the mass ratio of dichloromethane to chloroform is 4:1, the solid content of the particles is 15%, and an inert gas of 5% by mass of the solvent is added. The temperature is raised to 235° C. and maintained at a pressure of 2-3 MPa and a stirring speed of 50 rpm for 150 minutes to form a uniform polyester solution.

[0136] S3, low temperature and high pressure preparation of flash spinning solution:

[0137] The uniform polyester solution in the autoclave A is transferred to the autoclave B. The temperature in the autoclave B is 180°C. Supercritical carbon dioxide gas with a mass percentage of 15% of the solvent is added to the autoclave B. The mixture is stirred at 120 rpm for 0.5 h to form a uniform flash spinning solution.

[0138] S4, non-woven fabric forming:

[0139] The yarn was spun at a pressure of 10 MPa, and then electrostatically separated and laid. The electrostatic voltage was controlled at 50,000 V, and the residual solvent was treated by hot air. The mesh was preheated by three levels of infrared, and the temperatures of the three levels of infrared preheating were 60°C, 80°C, and 100°C, respectively, so that the residual solvent could be removed. The polyester flash nonwoven fabric was obtained at a hot pressing temperature of 240°C and a pressure of 5 N / mm.

[0140] Comparative Example 3

[0141] The polyester flash nonwoven fabric was prepared by the same method as in Example 1, except that: in the preparation process of this comparative example 3, the operations of step S1 and step S2 were not performed, and the flash spinning solution was directly prepared under high pressure conditions. The specific preparation process is as follows:

[0142] 90 parts of polyester particles, 10 parts of high-density polyethylene particles, 3 parts of compatibilizer EAA, 0.5 parts of antioxidant 168 and zinc oxide (3% of the mass of polyester particles) were put into an autoclave A, and chloroform and dichloromethane were added, wherein the mass ratio of dichloromethane to chloroform was 4:1, and the solid content in the autoclave A was 15%. 5% of the mass of the solvent was added with an inert gas, and the temperature was raised to 250°C, and the pressure was maintained at 14 MPa and the stirring speed was maintained at 120 rpm for 180 minutes for spinning.

[0143] After electrostatic filament laying, the electrostatic voltage is controlled at 30000-50000V, and the residual solvent is treated by hot air. The mesh is preheated in three levels of infrared, and the temperatures are 60℃, 80℃, and 100℃ respectively. The hot pressing temperature is 240℃ and the pressure is 5N / mm to obtain polyester flash non-woven fabric.

[0144] Comparative Example 4

[0145] The polyester flash nonwoven fabric was prepared by the same method as in Example 1, except that: in the preparation process of this comparative example 4, the amount of polyester particles was reduced. The specific preparation process is as follows:

[0146] S1. Polyester particle modification:

[0147] According to the weight proportions, 10 parts of polyester particles, 90 parts of high-density polyethylene particles, 3 parts of compatibilizer EAA, 0.5 parts of antioxidant 168 and zinc oxide (3% of the mass of polyester particles) are melt-blended at 240°C through a twin-screw extruder. The outlet of the extruder enters the cooling water of a mold temperature controller at a speed of 100m / min and is rapidly cooled at a speed of 40°C / s. The cooling water temperature is 5°C. The particles are cut by a cutter and ground into ultrafine powder in a grinder. The particle size of the ultrafine powder is 2-20um.

[0148] S2, high temperature and low pressure dissolving polyester:

[0149] The ultrafine powder of modified polyester is put into a high-pressure reactor A, and chloroform and dichloromethane are added, wherein the mass ratio of dichloromethane to chloroform is 4:1, the solid content of the ultrafine powder is 15%, and an inert gas of 5% by volume of the solvent is added. The temperature is raised to 235°C, and the pressure is maintained at 2-3MPa and the stirring speed is 50rpm for 60 minutes to form a uniform polyester solution.

[0150] S3, low temperature and high pressure preparation of flash spinning solution:

[0151] The uniform polyester solution in the autoclave A was transferred to the autoclave B. The temperature in the autoclave B was 180°C. Supercritical carbon dioxide gas with a volume of 15% of the solvent was added to the autoclave B. The mixture was stirred at 120 rpm for 0.5 h to form a uniform flash spinning solution.

[0152] S4, non-woven fabric forming:

[0153] The yarn was spun at a pressure of 10 MPa, and then electrostatically separated and laid. The electrostatic voltage was controlled at 50,000 V, and the residual solvent was treated by hot air. The mesh was preheated by three levels of infrared, and the temperatures of the three levels of infrared preheating were 60°C, 80°C, and 100°C, respectively, so that the residual solvent could be removed. The polyester flash nonwoven fabric was obtained at a hot pressing temperature of 240°C and a pressure of 5 N / mm.

[0154] Comparative Example 5

[0155] The polyester flash nonwoven fabric was prepared by the same method as in Example 1, except that zinc oxide was not added during the preparation of this comparative example 5. The specific preparation process is as follows:

[0156] S1. Polyester particle modification:

[0157] According to the weight proportions, 90 parts of polyester particles, 10 parts of high-density polyethylene particles, 3 parts of compatibilizer EAA and 0.5 parts of antioxidant 168 were melt-blended at 240°C through a twin-screw extruder. The outlet of the extruder entered the cooling water of the mold temperature controller at a speed of 100m / min and was rapidly cooled at a speed of 40°C / s. The cooling water temperature was 5°C. The particles were cut by a cutter and ground into ultrafine powder in a grinder. The particle size of the ultrafine powder was 2-20um.

[0158] S2, high temperature and low pressure dissolving polyester:

[0159] The ultrafine powder of modified polyester is put into a high-pressure reactor A, and chloroform and dichloromethane are added, wherein the mass ratio of dichloromethane to chloroform is 4:1, the solid content of the ultrafine powder is 15%, and an inert gas of 5% by volume of the solvent is added. The temperature is raised to 235°C, and the pressure is maintained at 2-3MPa and the stirring speed is 50rpm for 90 minutes to form a uniform polyester solution.

[0160] S3, low temperature and high pressure preparation of flash spinning solution:

[0161] The uniform polyester solution in the autoclave A was transferred to the autoclave B. The temperature in the autoclave B was 180°C. Supercritical carbon dioxide gas with a volume of 15% of the solvent was added to the autoclave B. The mixture was stirred at 120 rpm for 0.5 h to form a uniform flash spinning solution.

[0162] S4, non-woven fabric forming:

[0163] The yarn was spun at a pressure of 10 MPa, and then electrostatically separated and laid. The electrostatic voltage was controlled at 50,000 V, and the residual solvent was treated by hot air. The mesh was preheated by three levels of infrared, and the temperatures of the three levels of infrared preheating were 60°C, 80°C, and 100°C, respectively, so that the residual solvent could be removed. The polyester flash nonwoven fabric was obtained at a hot pressing temperature of 240°C and a pressure of 5 N / mm.

[0164] Comparative Example 6

[0165] The polyester flash nonwoven fabric was prepared by the same method as in Example 1, except that: during the preparation process of this comparative example 6, the spinning temperature was lowered, and the temperature of step S3 in this comparative example 6 was 170° C. (lower than the temperature range specified in the present invention). The specific preparation process is as follows:

[0166] S1. Polyester particle modification:

[0167] According to the weight proportions, 90 parts of polyester particles, 10 parts of high-density polyethylene particles, 3 parts of compatibilizer EAA, 0.5 parts of antioxidant 168 and zinc oxide (3% of the mass of polyester particles) are melt-blended at 240°C through a twin-screw extruder. The outlet of the extruder enters the cooling water of the mold temperature controller at a speed of 100m / min and is rapidly cooled at a speed of 40°C / s. The cooling water temperature is 5°C. The particles are cut by a cutter and ground into ultrafine powder in a grinder. The particle size of the ultrafine powder is 2-20um.

[0168] S2, high temperature and low pressure dissolving polyester:

[0169] The ultrafine powder of modified polyester is put into a high-pressure reactor A, and chloroform and dichloromethane are added, wherein the mass ratio of dichloromethane to chloroform is 4:1, the solid content of the ultrafine powder is 15%, and an inert gas of 5% by volume of the solvent is added. The temperature is raised to 235°C, and the pressure is maintained at 2-3MPa and the stirring speed is 50rpm for 90 minutes to form a uniform polyester solution.

[0170] S3, low temperature and high pressure preparation of flash spinning solution:

[0171] The uniform polyester solution in the autoclave A was transferred to the autoclave B. The temperature in the autoclave B was 170°C. Supercritical carbon dioxide gas with a volume of 15% of the solvent was added to the autoclave B. The mixture was stirred at 120 rpm for 0.5 h to form a uniform flash spinning solution.

[0172] S4, non-woven fabric forming:

[0173] The yarn was spun at a pressure of 10 MPa, and then electrostatically separated and laid. The electrostatic voltage was controlled at 50,000 V, and the residual solvent was treated by hot air. The mesh was preheated by three levels of infrared, and the temperatures of the three levels of infrared preheating were 60°C, 80°C, and 100°C, respectively, so that the residual solvent could be removed. The polyester flash nonwoven fabric was obtained at a hot pressing temperature of 240°C and a pressure of 5 N / mm.

[0174] Comparative Example 7

[0175] The polyester flash nonwoven fabric was prepared by the same method as in Example 1, except that: in the preparation process of this comparative example 7, in step S4, the temperature difference between the three levels of infrared preheating was increased. The specific preparation process is as follows:

[0176] S1. Polyester particle modification:

[0177] According to the weight proportions, 90 parts of polyester particles, 10 parts of high-density polyethylene particles, 3 parts of compatibilizer EAA, 0.5 parts of antioxidant 168 and zinc oxide (3% of the mass of polyester particles) are melt-blended at 240°C through a twin-screw extruder. The outlet of the extruder enters the cooling water of the mold temperature controller at a speed of 100m / min and is rapidly cooled at a speed of 40°C / s. The cooling water temperature is 5°C. The particles are cut by a cutter and ground into ultrafine powder in a grinder. The particle size of the ultrafine powder is 2-20um.

[0178] S2, high temperature and low pressure dissolving polyester:

[0179] The ultrafine powder of modified polyester is put into a high-pressure reactor A, and chloroform and dichloromethane are added, wherein the mass ratio of dichloromethane to chloroform is 4:1, the solid content of the ultrafine powder is 15%, and an inert gas of 5% by volume of the solvent is added. The temperature is raised to 235°C, and the pressure is maintained at 2-3MPa and the stirring speed is 50rpm for 90 minutes to form a uniform polyester solution.

[0180] S3, low temperature and high pressure preparation of flash spinning solution:

[0181] The uniform polyester solution in the autoclave A was transferred to the autoclave B. The temperature in the autoclave B was 180°C. Supercritical carbon dioxide gas with a volume of 15% of the solvent was added to the autoclave B. The mixture was stirred at 120 rpm for 0.5 h to form a uniform flash spinning solution.

[0182] S4, non-woven fabric forming:

[0183] The spinning was carried out under a pressure of 10 MPa, and the electrostatic wire laying was carried out. The electrostatic voltage was controlled at 50,000 V, and the residual solvent was treated by hot air. The mesh was subjected to three-level infrared preheating, and the temperatures of the three-level infrared preheating were 60°C, 90°C, and 120°C, respectively, so that the residual solvent could be removed. The polyester flash nonwoven fabric was obtained at a hot pressing temperature of 240°C and a pressure of 5N / mm.

[0184] The dissolution state and fiber state of the polyester solutions in the above examples and comparative examples were observed, and the specific results are shown in Table 1 below.

[0185] Table 1 Dissolution and fiber state

[0186]

[0187] Note: Complete dissolution is determined by the absence of swollen fine particles, no agglomerated molten state, and a uniform and transparent solution in the sight glass kettle.

[0188] From the data in Table 1 above, it can be seen that: Example 1-Example 5 adopts the preparation method of the present invention to effectively reduce the crystallinity of polyester. The modified polyester prepared by the present invention has low crystallinity, and the polyester is easier to dissolve during the dissolution process, and the molecular chain is easier to disentangle, thereby obtaining a uniform spinning solution. The present invention adopts a two-step method for flash spinning of polyester, first completely dissolving it in a high temperature and low pressure state to form a uniform and stable solution, and then inhaling supercritical gas under low temperature and high pressure to form a uniform flash spinning solution, and forming long fibers with a mesh structure through flash spinning. The present invention overcomes the difficulty of dissolving polyester and fills the gap in the use of polyester materials for flash spinning. The simple unmodified polyester has a large crystallinity, is difficult to dissolve, has a long dissolution time, and has a coarser fiber diameter of the ejected filament bundle; after being modified and made into an ultrafine powder, the crystallinity is reduced, the solubility in the solvent is enhanced, and the fiber diameter of the ejected filament bundle becomes thinner.

[0189] From the comparison of the data of Comparative Example 1 and Example 1, it can be seen that: if the one-step dissolution method is used to prepare the flash spinning solution, the spinning temperature and pressure are relatively high, the content of the auxiliary filamentation gas dissolved at this temperature is low, the resin cannot be completely dissolved in the system, the solution temperature has a large temperature difference with the external temperature, and a powder state is formed after spinning, and the subsequent molding performance deteriorates.

[0190] From the comparison of the data of Comparative Example 2 and Example 1, it can be seen that if the particles are not ground into ultrafine powder in step S1, the resin will take a long time to dissolve in the system, the molecular chains cannot be completely untangled, and the formed fibers will have a large diameter. The large fiber diameter will lead to reduced mechanical properties of the nonwoven fabric.

[0191] From the comparison of the data of Comparative Example 3 and Example 1, it can be seen that if steps S1 and S2 are not performed, the solubility of the resin in the system becomes poor, the molecules cannot be completely untangled and stretched in the system, and directly become powder under the action of high temperature during the spraying process.

[0192] From the comparison of the data of Comparative Example 4 and Example 1, it can be seen that if the dosage ratio of polyester particles is reduced, the raw material is mainly polyethylene, and the solubility is enhanced, the strength of the generated fibers will be reduced, resulting in a decrease in the strength of the non-woven fabric.

[0193] From the data comparison of Comparative Example 5, Comparative Example 7 and Example 1, it can be seen that if zinc oxide is not added, there is not much difference in the resin dissolution, and the antibacterial performance of the non-woven fabric will be reduced after the non-woven fabric is formed; if the temperature difference between subsequent infrared is increased, there is not much difference in the early dissolution effect.

[0194] From the comparison of the data of Comparative Example 6 and Example 1, it can be seen that if the spinning temperature is lowered, the resin is analyzed inside the system, the fiber is relatively wet and does not unfold, the spinning process is unstable, and the fiber is disconnected.

[0195] The polyester flash nonwoven fabrics prepared in the above examples and comparative examples were tested for performance, and the testing methods involved were as follows: after the nonwoven fabrics were subjected to constant temperature and humidity treatment, the quantitative measurement standard was GB / T451.2-2002; the thickness measurement standard was GB / T451.3-2002; the tensile strength and elongation measurement standard was GB / T12914-2008; the tear measurement standard was GB / T455-2002; and the air permeability measurement standard was GB / T5453. The test results are shown in Table 2.

[0196] Table 2 Test results of physical properties of polyester flash nonwoven fabrics

[0197]

[0198] Note: MD in Table 2 is the longitudinal direction of the nonwoven fabric, and CD is the transverse direction.

[0199] The polyester flash nonwoven fabrics prepared in the above examples and comparative examples were tested for antibacterial rate: see standard GB / T20944.2-2007 (Evaluation of antibacterial properties of textiles Part 2: Absorption method) The specific test conditions are:

[0200] The bacterial species used in the antimicrobial test were Staphylococcus aureus, Klebsiella pneumoniae and Escherichia coli.

[0201] Culture conditions: temperature 37℃±2℃, vibration frequency 110min -1 , culture time 18-24 hours.

[0202] The antibacterial rate (i.e., the inhibition rate) is expressed as: antibacterial rate = (average number of recovered bacteria in blank control samples - average number of recovered bacteria in test samples) / average number of recovered bacteria in blank control samples. An inhibition rate of more than 95% represents "having antibacterial properties", and an inhibition rate of more than 99% represents "having better antibacterial function". The specific test results are shown in Table 3.

[0203] Table 3 Antibacterial performance test results

[0204]

[0205] From the data in Table 2 and Table 3 above, it can be seen that the polyester flash-steamed nonwoven fabrics prepared by the preparation method of the present invention in Examples 1 to 5 have good fiber structures, and the polyester flash-steamed nonwoven fabrics have good antibacterial properties in combination with the properties of polyester itself. The polyester flash-steamed nonwoven fabrics have high strength, good air permeability, good antibacterial properties, and excellent comprehensive properties.

[0206] From the comparison of the data of Comparative Example 1 and Example 1, it can be seen that if the flash spinning solution is prepared by a one-step dissolution method, the solubility of the resin and the supercritical gas in the system becomes poor, causing the fiber to become powdery, and the strength, air permeability and antibacterial properties of the non-woven fabric after molding are significantly reduced.

[0207] From the comparison of the data of Comparative Example 2 and Example 1, it can be seen that if the particles are not ground into ultrafine powder in step S1, the resin has a small specific surface area, dissolves slowly in the system, the diameter of the ejected fiber becomes coarser, the air permeability is improved, but the antibacterial performance becomes worse.

[0208] From the comparison of the data of Comparative Example 3 and Example 1, it can be seen that if steps S1 and S2 are not performed, the sprayed filament bundles are in powder form, the powdered fibers do not have the three-dimensional network structure of the flash-steamed non-woven fabric, the bonding ability between the layers becomes poor, and the strength, air permeability and antibacterial properties of the non-woven fabric after hot pressing are significantly reduced.

[0209] From the comparison of the data of Comparative Example 4 and Example 1, it can be seen that if the dosage ratio of polyester particles is reduced, the raw material is mainly polyethylene, and polyethylene itself has good solubility, but its strength, air permeability and antibacterial properties are worse than polyester, then the strength, air permeability and antibacterial properties of the prepared non-woven fabric will be reduced.

[0210] From the comparison of the data of Comparative Example 5 and Example 1, it can be seen that if zinc oxide is not added, there is no inhibitory effect of zinc oxide particles on fungi, and the antibacterial performance is significantly reduced.

[0211] From the comparison of the data of Comparative Example 6 and Example 1, it can be seen that: if the spinning temperature is lowered, part of the resin will precipitate in the solvent, and the solvent cannot be completely flash-evaporated at low temperature, which will make the fiber wet and difficult to unfold, the spinning process will be unstable, the filament bundles will be broken, the web laying will be uneven, and the subsequent solvent treatment will be difficult. After hot pressing, the strength performance, air permeability and antibacterial performance will be significantly reduced. Therefore, the spinning temperature specified in the present invention is more conducive to obtaining a non-woven fabric product with excellent performance.

[0212] From the data comparison of Comparative Example 7 and Example 1, it can be seen that if the temperature difference between the three-stage infrared preheating is increased, the strength performance of the non-woven fabric will be significantly damaged. The increase in the temperature difference between the three-stage infrared preheating will lead to uncontrollable solvent removal speed, which will eventually affect the structure inside the non-woven fabric and further affect the strength performance. In the preparation method described in the present application, by reasonably controlling the temperature difference between the three-stage infrared preheating, the speed of residual solvent removal is more compatible with the structure of the polyester flash non-woven fabric, thereby obtaining a non-woven fabric product with relatively excellent comprehensive performance.

[0213] In summary, the present invention modifies polyester, high-density polyethylene particles, and additives in a twin-screw extruder, and adjusts the crystallinity of the particles by a quenching method, and the amount of polyethylene used can adjust the particle density to make it better soluble in the solvent. The modified particles are ground into ultrafine powders to increase the solubility in the solvent. The modified polyester is added to a reactor and mixed with a solvent, and a certain auxiliary gas is first added. The resin particles with low crystallinity can be dissolved at high temperature and low pressure to form a uniform polyester solution, and then transferred to a low-temperature autoclave to fully absorb supercritical gas spinning and web laying hot pressing to prepare a non-woven fabric with high tensile strength, good air permeability, and excellent antibacterial properties.

[0214] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0215] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A method for preparing a polyester flash nonwoven fabric, characterized in that: The preparation method is: S1. Polyester particle modification: Adding polyester particles, polyethylene particles, zinc oxide, a compatibilizer and an antioxidant into an extruder to extrude modified particles, and grinding the modified particles to obtain ultrafine powder; S2, high temperature and low pressure dissolving polyester: The ultrafine powder and solvent are added into an autoclave, and stirred and dissolved under heating and pressurization conditions to form a uniform polyester solution; S3, preparing flash spinning solution: The uniform polyester solution obtained in step S2 is cooled to the spinning temperature, and supercritical carbon dioxide gas is introduced and stirred to form a uniform flash spinning solution; S4, non-woven fabric forming: The spinning pressure is controlled to spin the yarn, the yarn is electrostatically separated and laid, the residual solvent is treated by hot air to obtain a mesh, the mesh is subjected to three-level infrared preheating, and finally hot pressing to obtain a polyester flash non-woven fabric; According to weight percentage, the polyester particles are 70-100 parts, the polyethylene particles are 0-30 parts, the compatibilizer is 3-5 parts, and the antioxidant is 0.5-2 parts; the amount of zinc oxide is 0.5%-5% of the mass of the polyester particles; The specific operation of step S1 polyester particle modification is: The polyester particles, polyethylene particles, zinc oxide, compatibilizer and antioxidant are melt-blended at 240-250° C. through a twin-screw extruder, and the outlet of the extruder enters the cooling water of a mold temperature controller at a speed of 50-100 m / min and is rapidly cooled at a speed of 30-60° C. / s, and the modified particles are obtained by cutting with a cutter; The modified particles are put into a grinder and ground to obtain ultrafine powder; The particle size of the ultrafine powder is 2-20um, the crystallinity is 10-40%, and the density is 1.30-1.40g / cm 3 .

2. The method for preparing a polyester flash nonwoven fabric according to claim 1, characterized in that: The polyester particles have a melting point of 220-240°C and a number average molecular weight of 20,000-30,000; The polyethylene particles are high-density polyethylene with a melting point of 130-135°C and a number average molecular weight of 100,000-150,000; The compatibilizer is at least one of EAA, EVA, and POE; The antioxidant is at least one of antioxidant 168 and antioxidant 1010; The solvent is at least one of aliphatic hydrocarbon and halogenated hydrocarbon.

3. The method for preparing a polyester flash nonwoven fabric according to claim 1, characterized in that: In step S2, the mass proportion of the ultrafine powder in the uniform polyester solution is 15-20%; During the dissolution process of step S2, an inert gas is introduced to promote dissolution, and the mass of the inert gas introduced is 1-5% of the mass of the solvent; The temperature condition of the high temperature and low pressure dissolution is 230-240° C., the pressure condition is 1-3 Mpa, the stirring time is 60-120 min, and the stirring speed is 50-70 rpm.

4. The method for preparing a polyester flash nonwoven fabric according to claim 1, characterized in that: In step S3, the mass of supercritical carbon dioxide introduced is 10-20% of the mass of the solvent; In step S3, the spinning temperature is 180-190° C., and the stirring speed is 100-150 rpm.

5. The method for preparing a polyester flash nonwoven fabric according to claim 1, characterized in that: In step S4, the spinning pressure is 9-11 MPa; The voltage of the electrostatic wire laying is controlled at 30000-50000V.

6. The method for preparing a polyester flash nonwoven fabric according to claim 1, characterized in that: In step S4, the three-level infrared heating conditions are: the first-level red temperature heating temperature is 60-80°C, the second-level red temperature heating temperature is 80-100°C, and the third-level red temperature heating temperature is 100°C-120°C; The temperature difference between the second level red temperature heating and the first level red temperature heating is not less than 5°C and not more than 25°C, and the temperature difference between the third level red temperature heating and the second level red temperature heating is not less than 5°C and not more than 25°C.

7. The method for preparing a polyester flash nonwoven fabric according to claim 1, characterized in that: In step S4, the pressure during hot pressing is 5-30 N / mm and the temperature is 230-250°C.

8. A polyester flash nonwoven fabric, characterized in that: The polyester flash nonwoven fabric is prepared by the preparation method described in any one of claims 1 to 7.

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