CN111229051A - Preparation method of electrostatic spinning polysulfonamide electret composite filter material - Google Patents
Preparation method of electrostatic spinning polysulfonamide electret composite filter material Download PDFInfo
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- CN111229051A CN111229051A CN202010170094.2A CN202010170094A CN111229051A CN 111229051 A CN111229051 A CN 111229051A CN 202010170094 A CN202010170094 A CN 202010170094A CN 111229051 A CN111229051 A CN 111229051A
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- 239000000463 material Substances 0.000 title claims abstract description 49
- 238000010041 electrostatic spinning Methods 0.000 title claims abstract description 42
- 239000002131 composite material Substances 0.000 title claims abstract description 22
- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims abstract description 52
- 239000004810 polytetrafluoroethylene Substances 0.000 claims abstract description 52
- 238000000034 method Methods 0.000 claims abstract description 38
- 239000000835 fiber Substances 0.000 claims abstract description 23
- 239000002114 nanocomposite Substances 0.000 claims abstract description 16
- 230000008569 process Effects 0.000 claims abstract description 15
- 230000005684 electric field Effects 0.000 claims abstract description 12
- 239000000243 solution Substances 0.000 claims description 44
- 238000009987 spinning Methods 0.000 claims description 42
- 239000002105 nanoparticle Substances 0.000 claims description 28
- -1 Polytetrafluoroethylene Polymers 0.000 claims description 19
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 claims description 18
- 239000002904 solvent Substances 0.000 claims description 18
- 239000006185 dispersion Substances 0.000 claims description 17
- 239000002121 nanofiber Substances 0.000 claims description 14
- 239000012528 membrane Substances 0.000 claims description 13
- 238000002347 injection Methods 0.000 claims description 10
- 239000007924 injection Substances 0.000 claims description 10
- 239000007788 liquid Substances 0.000 claims description 9
- 239000011259 mixed solution Substances 0.000 claims description 8
- 238000005516 engineering process Methods 0.000 claims description 7
- 230000005686 electrostatic field Effects 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 6
- 239000000758 substrate Substances 0.000 claims description 6
- 238000009210 therapy by ultrasound Methods 0.000 claims description 6
- 230000010412 perfusion Effects 0.000 claims description 5
- 229920000642 polymer Polymers 0.000 claims description 5
- BFKJFAAPBSQJPD-UHFFFAOYSA-N tetrafluoroethene Chemical group FC(F)=C(F)F BFKJFAAPBSQJPD-UHFFFAOYSA-N 0.000 claims description 5
- 238000004945 emulsification Methods 0.000 claims description 4
- 239000004745 nonwoven fabric Substances 0.000 claims description 4
- 238000001914 filtration Methods 0.000 abstract description 15
- 238000002156 mixing Methods 0.000 abstract description 5
- 230000009471 action Effects 0.000 abstract description 3
- 238000003860 storage Methods 0.000 abstract description 3
- 239000002245 particle Substances 0.000 description 8
- 230000000694 effects Effects 0.000 description 5
- 230000010287 polarization Effects 0.000 description 3
- 238000001179 sorption measurement Methods 0.000 description 3
- 239000004812 Fluorinated ethylene propylene Substances 0.000 description 2
- 239000002033 PVDF binder Substances 0.000 description 2
- 238000005374 membrane filtration Methods 0.000 description 2
- 244000005700 microbiome Species 0.000 description 2
- 229920009441 perflouroethylene propylene Polymers 0.000 description 2
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 2
- 239000011550 stock solution Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- 241000711573 Coronaviridae Species 0.000 description 1
- 241000282414 Homo sapiens Species 0.000 description 1
- 206010035664 Pneumonia Diseases 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000005516 deep trap Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000001523 electrospinning Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- HQQADJVZYDDRJT-UHFFFAOYSA-N ethene;prop-1-ene Chemical group C=C.CC=C HQQADJVZYDDRJT-UHFFFAOYSA-N 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
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- 230000005923 long-lasting effect Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
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- 230000035699 permeability Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000037303 wrinkles Effects 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D67/00—Processes specially adapted for manufacturing semi-permeable membranes for separation processes or apparatus
- B01D67/0002—Organic membrane manufacture
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/54—Particle separators, e.g. dust precipitators, using ultra-fine filter sheets or diaphragms
- B01D46/543—Particle separators, e.g. dust precipitators, using ultra-fine filter sheets or diaphragms using membranes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D69/00—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor
- B01D69/12—Composite membranes; Ultra-thin membranes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
- B01D71/06—Organic material
- B01D71/66—Polymers having sulfur in the main chain, with or without nitrogen, oxygen or carbon only
- B01D71/68—Polysulfones; Polyethersulfones
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Artificial Filaments (AREA)
- Nonwoven Fabrics (AREA)
- Filtering Materials (AREA)
Abstract
The invention relates to a preparation method of an electrostatic spinning polysulfonamide electret composite filter material. The preparation method disclosed by the invention is simple in steps and strong in operability, and the PTEF nano-electrets in the PTFE/polysulfonamide electret nano-composite fiber filter material are uniformly distributed in the fibers through a mixing process and an electrostatic spinning process, so that the charge storage capacity and the charge stability of the electret material are enhanced under the action of a high-voltage electric field in the electrostatic spinning process. The PTFE/polysulfonamide electret nano composite fiber filter material obtained by the method has high filtering performance and small filtering resistance.
Description
Technical Field
The invention relates to an air filter material, in particular to a preparation method of an electrostatic spinning polysulfonamide electret composite filter material.
Background
With the rapid development of economy, a large amount of dust particles, chemical substances, harmful microorganisms and the like are generated in the industrial production and natural activity process of human beings, the environmental quality and the body health of people are seriously harmed, the emergence and the spread of the novel coronavirus pneumonia in 2020 cause extreme attention of people to the field of air filtration, and the effective control of harmful substances in the air is a major problem which needs to be solved urgently.
Conventional filtering materials rely on the structural characteristics of the materials to realize effective filtering of particles, removal of fine particles is not thorough enough, and the materials are easy to breed harmful microorganisms, so that secondary pollution is possible. The electret material can greatly improve the interception effect of electrostatic adsorption force on particles on the basis of the original filter material structure efficiency through electrostatic adsorption, thereby improving the filter efficiency and ensuring the characteristic of low pressure resistance.
Excellent dielectric properties such as high bulk and surface resistance, high dielectric breakdown strength, low moisture absorption, air permeability, and the like are required for the raw material used as the electret. Electret materials can be divided into inorganic electrets, polymeric electrets and biological electrets. The electret materials of high polymers such as Polytetrafluoroethylene (PTFE), Fluorinated Ethylene Propylene (FEP), polyvinylidene fluoride (PVDF), etc., which are mainly used as air filter materials, are excellent electret materials.
The electrostatic spinning technology is not only a nanofiber preparation technology for spinning by using high voltage, but also a nanofiber electret technology, and has the advantages that a large amount of space charges can be injected into fibers in the spinning process compared with corona discharge and thermal polarization electret technologies, the space charges are easily captured by deep traps inside the fibers, dipole polarization can be induced to generate polarization charges, and the electret effect is long-lasting and durable, so that the nanofiber electret filtering material can be prepared by one-step forming through an electrostatic spinning method, and the nanofiber electret filtering material has an excellent electret effect.
Application No.: 201410254387.3 discloses a method for preparing polysulfonamide nano fiber felt, which comprises the following steps: mixing polysulfonamide and a solvent to prepare a polysulfonamide spinning stock solution, injecting the polysulfonamide spinning stock solution into an injector of an electrostatic spinning device, adjusting the collection distance under the action of an external electric field, changing liquid drops at the top end of a metal needle into a cone shape when the electric field force is greater than the surface tension of the solution, ejecting the liquid drops from the top end to form jet flow, stretching and thinning the jet flow in the electric field, volatilizing and solidifying the solvent, falling on an aluminum foil with a certain receiving distance to form an electrospun membrane, and drying the electrospun membrane under a vacuum condition to obtain the polysulfonamide electrospun membrane. The polysulfonamide nano fiber felt with different structures and appearances is prepared through electrostatic spinning, and the prepared polysulfonamide nano fiber felt has excellent adsorption performance and thermal stability and is a separation filtering material with a very promising prospect.
Disclosure of Invention
The invention aims to provide a preparation method of an electrostatic spinning polysulfonamide electret composite filter material.
Still another object of the present invention is to provide a PTFE/polysulfonamide composite fiber filter material obtained by the above method.
The purpose of the invention is realized by the following scheme: a preparation method of electrostatic spinning polysulfonamide electret composite filter material, which takes polysulfonamide as a substrate, adds Polytetrafluoroethylene (PTFE) nano particles into the polysulfonamide, and prepares a PTFE/polysulfonamide nano composite fiber membrane by electrostatic spinning technology, comprises the following steps:
1) dispersing polytetrafluoroethylene nanoparticles in an N, N-dimethylformamide solvent, and performing ultrasonic treatment for 20-60 min to obtain a solvent dispersion solution of the polytetrafluoroethylene nanoparticles;
2) adding the solvent dispersion liquid of the polytetrafluoroethylene nanoparticles into 10-17% by mass of the polysulfonamide polymer solution, continuously stirring for 30-120 min, and then carrying out ultrasonic defoaming on the solution for 20-120 min to form a PTFE/polysulfonamide nanocomposite spinning solution, wherein the polytetrafluoroethylene nanoparticles account for 0.1-2% by mass of the spinning solution;
3) uniformly and slowly injecting the PTFE/polysulfonamide nanocomposite spinning solution into a material cylinder of an injection device for electrostatic spinning, vertically placing the injection device right above a receiving device, slowly extruding the spinning solution from the spinning material cylinder through an operation control system, stretching the spinning solution through an electric field to form nanofibers, and finally forming a PTFE/polysulfonamide nanocomposite fiber membrane on the surface of the receiving device, wherein the electrostatic spinning process parameters are as follows: the electrostatic voltage is 20-50 kV, the receiving distance is 10-20 cm, the perfusion speed is 0.2-0.8 mL/h, the receiving device is used for receiving by the rotation of a roller, the revolution is 20-50 r/min, the ambient temperature of the electrostatic field is 25-50 ℃, and the humidity is below 50%.
The method fully considers the stability of the spinning solution and the dispersion uniformity of the electret PTFE nano particles in the spinning solution to directly influence the filtering and charge storage performance of the nano fiber filtering membrane. In order to prevent the low surface energy PTFEE nano particles from easily generating agglomeration phenomenon in the solution, the ultrasonic and long-time stirring method is designed to improve the dispersion performance of the PTFEE nano particles in the solution.
Specifically, 0.12g to 0.18g of polytetrafluoroethylene nanoparticles are dispersed in 5ml of N, N-dimethylformamide solvent, and ultrasonic treatment is carried out for 20 to 60min to obtain the polytetrafluoroethylene nanoparticle solvent dispersion liquid.
On the basis of the scheme, the diameter of the polytetrafluoroethylene nano-particles is 100-150 nm.
Considering the influence of the viscosity of the spinning solution on the intermolecular cohesion and the tensile property of the electric field force, in order to improve the spinning property, the mass fraction of the polysulfonamide in the spinning solution is preferably 12-14%.
The viscosity of the spinning solution is directly influenced by the content of the polymer, when the viscosity is high, the intermolecular cohesive force is high, the electric field force is difficult to stretch, and the diameter is correspondingly enlarged due to insufficient stretching; however, when the viscosity is too low, the intermolecular cohesion is small, the solution is too thin, and the fiber may not be formed due to the failure to stretch the solution.
In order to ensure the uniformity of the fiber membrane, a non-woven fabric base material is flatly laid and fixed on a roller before spinning. A non-woven fabric substrate is flatly laid and fixed on a receiving roller, and the substrate cannot be pulled forcefully during the flatly laying process so as to prevent wrinkles from appearing.
Preferably, in the step 2), the mixed solution is stirred for 30min at a speed of 20000r/min by using a high shear emulsification disperser, and then the mixed solution is placed into an ultrasonic bath for deaeration for 120min to form the uniformly mixed tetrafluoroethylene/polysulfonamide spinning solution.
Preferably, in the step 3), the electrostatic spinning process parameters are as follows: the electrostatic voltage is set to be 24kV, the receiving distance is 10cm, the perfusion speed is 0.3mL/h, the rotation number of the roller is 30r/min, the ambient temperature of the electrostatic field is 25 ℃, and the humidity is 30%.
The invention also provides an electrostatic spinning polysulfonamide electret composite filter material which is prepared by the method, wherein the mass fraction of the polysulfonamide polymer in the spinning solution is 10-17%, and the mass fraction of the polytetrafluoroethylene nanoparticles is 0.1-2%.
The preparation method disclosed by the invention is simple in steps and strong in operability, the PTEF nano-electrets in the PTFE/polysulfonamide electret nano-composite fiber filter material are uniformly distributed in the fibers through a mixing process and an electrostatic spinning process, the charge storage capacity and the charge stability of the electret material are enhanced through the action of a high-voltage electric field in the electrostatic spinning process, and the filtering efficiency of the filter material can be effectively improved while the low pressure resistance is kept by utilizing the electrostatic effect of the composite electret filter material. The PTFE/polysulfonamide electret nano composite fiber filter material obtained by the method has high filtering performance and small filtering resistance.
Drawings
FIG. 1 is a schematic structural view of an electrospinning device.
1-an injection device; 2-a receiving device;
3-control system;
4-high voltage power supply.
Detailed Description
The invention is further illustrated by the following examples.
Example 1
An electrostatic spinning polysulfonamide electret composite filter material is prepared by taking polysulfonamide as a substrate, adding PTFE nano particles into the polysulfonamide, preparing a PTFE/polysulfonamide nano composite fiber membrane by an electrostatic spinning technology and preparing the material by the following steps:
1) preparation of PTFE dispersion:
dispersing 0.12g of PTFE nano particles in 5ml of N, N-dimethylformamide solvent, and carrying out ultrasonic treatment for 20-60 min to obtain a PTFE nano particle solvent dispersion liquid, wherein the diameter of the PTFE nano particles is 100-150 nm;
2) preparing a PTFE/polysulfonamide spinning solution:
weighing 100g of polysulfonamide spinning solution with the mass fraction of 12%, adding the solvent dispersion solution of the PTFE nano particles for mixing, stirring the mixed solution for 30min by using a high-shear emulsification dispersion machine at the speed of 20000r/min, and then carrying out ultrasonic defoaming on the mixed solution for 120min to form uniformly mixed PTFE/polysulfonamide spinning solution;
3) preparing an electrostatic spinning polysulfonamide electret composite filter material by electrostatic spinning:
the PTFE/polysulfonamide spinning solution is slowly injected into an injection cylinder for electrostatic spinning, the electrostatic spinning equipment is shown in figure 1 and comprises an injection system 1, a receiving device 2, a control system 3 and a high-voltage power supply 4, the injection device 1 is vertically arranged right above the receiving device 2, the receiving device 2 is a roller device, and before electrostatic spinning, a non-woven fabric substrate is flatly laid and fixed on a roller, wherein the control system 3 is used for setting parameters such as starting and stopping of the whole system, propelling and extruding of the spinning solution, and spinning speed;
in the process of preparing the nano-fiber by electrostatic spinning, the prepared spinning solution doped with PFTE particles is slowly sucked into an injector of an injection system 1 to avoid generating bubbles, the spinning solution is slowly extruded under the control of a propeller, the nano-fiber is formed in an electric field stretching area provided by a high-voltage power supply 4, and finally a PTFE/polysulfonamide nano-composite fiber membrane is formed on the surface of a receiving device 2,
an electrostatic spinning process is adopted, the electrostatic voltage is set to be 24kV, the receiving distance is 10cm, and the filling speed is 0.3 mL/h; the receiving device 2 receives the data by the rotation of a roller at the revolution of 30 r/min; the ambient temperature of the electrostatic field is 25 ℃, and the humidity is 30%; the spinning solution is extruded and is stretched by an electric field to form nano-fibers, and finally a PTFE/polysulfonamide nano-composite fiber membrane is formed on the surface of the receiving device 2.
The electret composite filter material prepared by the method is determined to have the average fiber diameter of 200nm, the fiber membrane filtration efficiency of 99.92 percent (the filtration efficiency is relative to particles with the particle diameter of more than 0.3 mu m), and the pressure resistance of 19 Pa.
Example 2
An electrostatic spinning polysulfonamide electret composite filter material similar to the embodiment 1 is prepared by the following steps:
(1) preparation of polytetrafluoroethylene dispersion:
dispersing 0.18g of polytetrafluoroethylene nanoparticles in 5ml of N, N-dimethylformamide solvent, and carrying out ultrasonic treatment for 20-60 min to obtain a polytetrafluoroethylene nanoparticle solvent dispersion liquid.
(2) Preparing a tetrafluoroethylene/polysulfonamide spinning solution:
weighing 100g of polysulfonamide spinning solution with the mass fraction of 12%, adding the solvent dispersion solution of the polytetrafluoroethylene nanoparticles for mixing, stirring the mixed solution for 30min by using a high-shear emulsification dispersion machine at the speed of 20000r/min, and then placing the mixed solution into an ultrasonic bath for defoaming for 120min to form the uniformly mixed tetrafluoroethylene/polysulfonamide spinning solution.
(3) Preparing electrostatic spinning:
and slowly injecting the tetrafluoroethylene/polysulfonamide spinning solution into an injection charging barrel, adopting an electrostatic spinning process, setting the electrostatic voltage to be 24kV, setting the receiving distance to be 10cm, setting the perfusion speed to be 0.3mL/h, and setting the revolution of a receiving device to be 30 r/min. The electrostatic field environment temperature is 25 ℃, and the humidity is 30%. The spinning solution is extruded and is stretched by an electric field to form nano-fibers, and finally a PTFE/polysulfonamide nano-composite fiber membrane is formed on the surface of the receiving device.
The electret composite filter material prepared by the method is determined to have the average fiber diameter of 220nm, the fiber membrane filtration efficiency of 99.98 percent (the filtration efficiency is relative to particles with the particle diameter of more than 0.3 mu m), and the pressure resistance of 19 Pa.
Claims (8)
1. The preparation method of the electrostatic spinning polysulfonamide electret composite filter material takes polysulfonamide as a substrate and is characterized in that: adding Polytetrafluoroethylene (PTFE) nano particles into polysulfonamide, and preparing a PTFE/polysulfonamide nano composite fiber membrane by an electrostatic spinning technology, wherein the method comprises the following steps:
1) dispersing PTFE nano particles in an N, N-dimethylformamide solvent, and performing ultrasonic treatment for 20-60 min to obtain a PTFE nano particle solvent dispersion liquid;
2) adding the solvent dispersion liquid of the polytetrafluoroethylene nanoparticles into 10-17% by mass of the polysulfonamide polymer solution, continuously stirring for 30-120 min, and then carrying out ultrasonic defoaming on the solution for 20-120 min to form a polytetrafluoroethylene/polysulfonamide nanocomposite spinning solution, wherein the PTFE nanoparticles account for 0.1-2% by mass of the spinning solution;
3) uniformly and slowly injecting the PTFE/polysulfonamide nanocomposite spinning solution into a material cylinder of an injection device for electrostatic spinning, vertically placing the injection device right above a receiving device, slowly extruding the spinning solution from the spinning material cylinder through an operation control system, stretching the spinning solution through an electric field to form nanofibers, and finally forming a PTFE/polysulfonamide nanocomposite fiber membrane on the surface of the receiving device, wherein the electrostatic spinning process parameters are as follows: the electrostatic voltage is 20-50 kV, the receiving distance is 10-20 cm, the perfusion speed is 0.2-0.8 mL/h, the receiving device is used for receiving by the rotation of a roller, the revolution is 20-50 r/min, the ambient temperature of the electrostatic field is 25-50 ℃, and the humidity is below 50%.
2. The method for preparing the electrostatic spinning polysulfonamide electret composite filter material according to claim 1, wherein the method comprises the following steps: dispersing 0.12 g-0.18 g of polytetrafluoroethylene nano particles in 5ml of N, N-dimethylformamide solvent, and carrying out ultrasonic treatment for 20-60 min to obtain the PTFE nano particle solvent dispersion liquid.
3. The method for preparing the electrostatic spinning polysulfonamide electret composite filter material according to claim 1 or 2, characterized in that: the diameter of the polytetrafluoroethylene nano-particles is 100-150 nm.
4. The method for preparing the electrostatic spinning polysulfonamide electret composite filter material according to claim 1, wherein the method comprises the following steps: the mass fraction of the polysulfonamide in the spinning solution is 12-14%.
5. The method for preparing the electrostatic spinning polysulfonamide electret composite filter material according to claim 1, wherein the method comprises the following steps: before spinning, a non-woven fabric base material is flatly laid and fixed on a roller.
6. The method for preparing the electrostatic spinning polysulfonamide electret composite filter material according to claim 1, wherein the method comprises the following steps: in the step 2), a high-shear emulsification dispersion machine is adopted to stir the mixed solution for 30min at the speed of 20000r/min, and then the mixed solution is placed into an ultrasonic bath to be defoamed for 120min to form the uniformly mixed tetrafluoroethylene/polysulfonamide spinning solution.
7. The method for preparing the electrostatic spinning polysulfonamide electret composite filter material according to claim 1, wherein the method comprises the following steps: in the step 3), the electrostatic spinning process parameters are as follows: the electrostatic voltage is set to be 24kV, the receiving distance is 10cm, the perfusion speed is 0.3mL/h, the rotation number of the roller is 30r/min, the ambient temperature of the electrostatic field is 25 ℃, and the humidity is 30%.
8. An electrospun polysulfonamide electret composite filter material prepared according to the method of any one of claims 1 to 7.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111685421A (en) * | 2020-06-19 | 2020-09-22 | 齐鲁工业大学 | Double-layer mask with nanofiber film-coated paper-based filter material |
| WO2023015826A1 (en) * | 2021-08-13 | 2023-02-16 | 南方科技大学台州研究院 | Nanofiber filtering membrane, and preparation method therefor and use thereof |
| CN117684331A (en) * | 2023-12-13 | 2024-03-12 | 上海经海纬象生物材料有限公司 | Electrostatic spinning PHA degradable filter material, preparation method and application thereof |
| CN119243415A (en) * | 2024-09-27 | 2025-01-03 | 天津工业大学 | An electret fresh-keeping nanofiber membrane and its preparation method and application |
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| CN111685421A (en) * | 2020-06-19 | 2020-09-22 | 齐鲁工业大学 | Double-layer mask with nanofiber film-coated paper-based filter material |
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