CN116116109A - Air filtration composite membrane material and preparation method thereof - Google Patents

Air filtration composite membrane material and preparation method thereof Download PDF

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Publication number
CN116116109A
CN116116109A CN202210678507.7A CN202210678507A CN116116109A CN 116116109 A CN116116109 A CN 116116109A CN 202210678507 A CN202210678507 A CN 202210678507A CN 116116109 A CN116116109 A CN 116116109A
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polyamide
composite membrane
air filtration
membrane material
spinning
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董丽杰
琚艳云
殷嘉骏
孙政权
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Wuhan University of Technology WUT
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/14—Other self-supporting filtering material ; Other filtering material
    • B01D39/16—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres
    • 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
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/02—Types of fibres, filaments or particles, self-supporting or supported materials
    • B01D2239/0266—Types of fibres, filaments or particles, self-supporting or supported materials comprising biodegradable or bio-soluble polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/06—Filter cloth, e.g. knitted, woven non-woven; self-supported material
    • B01D2239/065—More than one layer present in the filtering material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/10—Filtering material manufacturing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/12—Special parameters characterising the filtering material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/12—Special parameters characterising the filtering material
    • B01D2239/1208—Porosity
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
    • Y02A50/2351—Atmospheric particulate matter [PM], e.g. carbon smoke microparticles, smog, aerosol particles, dust

Abstract

The invention belongs to the technical field of new materials, and particularly relates to an air filtration composite membrane material. The air filtration composite membrane material comprises a substrate layer and a filter layer, wherein the substrate layer is degradable non-woven fabric and is modified by adopting an amino hydrocarbon silane coupling agent; the filter layer is a polyamide nanofiber membrane prepared by continuous electrostatic spinning. According to the invention, the substrate layer is modified by adopting the amino alkyl silane coupling agent, so that the binding force between the substrate layer and the filter layer is enhanced, and the problem that the nanofiber membrane is easy to fall off in use is effectively solved. In addition, the air filtering membrane can realize complete degradation, can generate gradual interception and blocking for fine particle aerosol, and can achieve the filtering efficiency of more than 99 percent for particles with the size of 0.3 mu m.

Description

Air filtration composite membrane material and preparation method thereof
Technical Field
The invention belongs to the technical field of air filtering materials, and particularly relates to an air filtering composite membrane material and a preparation method thereof.
Background
The problem of air pollution is increasingly aggravated, and submicron Particulate Matter (PM) in the air is inhaled by human body for a long time, which may induce a series of health problems such as respiratory tract infection, cardiovascular diseases, chronic lung diseases and even cancers. These fine particles are carriers of pathogenic microorganisms such as bacteria and viruses and gaseous pollutants, and as important materials for resisting air pollution and protecting human health, air filtration membranes have become a focus of attention and dependence. The air filter material using polypropylene (PP) as a base material has the serious problems of environmental pollution after being abandoned and difficult recovery and treatment. Development of multifunctional degradable materials is imperative.
The traditional air filter material can not meet the performance requirement of high filtration efficiency of submicron particles, and the electrostatic spinning technology can prepare superfine fibers with diameters in the range of nanometers to micrometers, so that the high-efficiency low-resistance filtration requirement can be realized. The nanofiber has the advantages of light weight, large specific surface area, high porosity and the like, and has attracted wide attention in the field of fiber filter materials. CN113797649a discloses an antibacterial and anti-virus air filtering material and a preparation method, CN111116974A discloses a nylon nanofiber aerogel material for air filtering and a preparation method, CN110711430a discloses a composite filtering material and a preparation technology, and the like, and the nanofiber is prepared by adopting an electrostatic spinning technology, but no continuous preparation technology for material modification and electrostatic spinning is involved. The composite filter material disclosed in CN110711430A and the piezoelectric antibacterial nano-film air filter membrane disclosed in CN110354648A are formed by depositing a fiber filter layer on a substrate layer, and are not combined with the substrate by chemical bonds, so that the nano-fiber membrane of the filter layer is easy to fall off in the use process, especially under the condition of high air flow.
The existing air filtering material has the problem that the material is difficult to process after being used. For example, CN113181711a discloses a degradable nanofiber membrane air filtering material, and the degradable nanofiber layer is mainly researched, and common non-woven fabric is used as a base material. The degradable bio-based air filter material disclosed in CN105597575A is prepared from soybean protein and polyvinyl alcohol as raw materials, and is prepared from a polyethylene screen as a base material to receive a nanofiber membrane layer. The substrate layer is an important supporting material of the air filtering membrane material, has large occupation ratio, pollutes the environment after being abandoned, and is difficult to recycle.
Disclosure of Invention
The invention aims to solve the technical problem of providing an air filtration composite membrane material and a preparation method thereof aiming at the defects existing in the prior art. The air filtration composite membrane material canEfficiently intercept PM 0.3 The tiny aerosol particles can be completely degraded after being discarded.
The invention adopts the technical proposal for solving the problems that:
an air filtration composite membrane material comprises a substrate layer and a filter layer, wherein the substrate layer is carboxyl-containing biodegradable non-woven fabric modified by an amino hydrocarbon silane coupling agent; the filter layer is a polyamide polymer nanofiber membrane prepared by continuous electrostatic spinning.
According to the scheme, the air filtration composite membrane material according to claim 1 is characterized in that the thickness of the base material layer is 0.08-0.2 mm, the thickness of the filter layer is 0.001-0.010 mm, and the diameter of the nano fiber in the filter layer is 20-500 nm; the BET specific surface area of the whole air filtration composite membrane material is 0.5-20 m 2 And/g, the porosity is 60% -90%.
According to the scheme, the base material layer accounts for more than 95wt.% and the filter layer accounts for less than 5wt.%.
According to the scheme, the material of the non-woven fabric is a degradable polymer material and contains carboxyl functional groups; among them, degradable polymers include, but are not limited to, polylactic acid, polyglycolic acid, amino acid polymers, and the like.
According to the above scheme, the polyamide-based polymer includes polyamide 6, polyamide 610, polyamide 66, polyamide 11, polyamide 12, polyamide 1010, polyamide 56, polyamide 4, polyamide 8, polyamide 9, polyamide 810, and the like.
According to the scheme, the amino alkyl silane coupling agent comprises gamma-amino propyl triethoxy silane, gamma-amino propyl trimethoxy silane, gamma- (beta-amino ethyl) amino propyl trimethoxy silane, gamma-urea propyl triethoxy silane, aniline methyl trimethyl silane, aniline methyl triethyl silane and the like.
The invention also provides a preparation method of the air filtration composite membrane material, which comprises the following steps:
(1) Preparing an amino alkyl silane coupling agent solution with the concentration of 1-20 wt.% by taking water and ethanol as mixed solvents; placing the non-woven fabric on a feeding reel of a continuous electrostatic spinning machine, starting an air pump to spray by adopting an amino alkyl silane coupling agent solution, then controlling the temperature to be 35-55 ℃ for drying, and winding to obtain a modified non-woven fabric base material;
(2) And (3) mounting the modified nonwoven fabric base material obtained in the step (1) on a feeding reel of an electrostatic spinning machine, dissolving polyamide polymers by using formic acid, acetic acid or a mixed solvent of formic acid and acetic acid as a solvent, preparing 10-15 wt.% of spinning solution, and continuously spinning to obtain the polyamide polymer nanofiber membrane combined with the modified nonwoven fabric base material, namely the air filtration composite membrane material.
According to the scheme, in the step (1), the mixed solvent consists of deionized water and absolute ethyl alcohol according to the volume ratio of 1:20-1:5.
According to the scheme, in the step (1), the spraying amount is 0.1-10 mL/cm 2 The spraying times are 1-10 times.
According to the scheme, in the step (2), the technological parameters of continuous electrostatic spinning are as follows: the temperature of the spinning chamber is 20-60 ℃, the humidity is controlled to be less than or equal to 50%, the nozzle is needle-free, the spinning speed is 1-350 mm/s, the set voltage is 10-100 kV, and the winding speed is controlled to be 0.1-2 m/min.
Compared with the prior art, the invention has the beneficial effects that:
firstly, the filter layer of the air filtration composite membrane material is a nanofiber membrane, has light weight, good permeability and large specific surface area, has a nanofiber structure, can efficiently intercept tiny aerosol particles, and is suitable for PM 2.5 The filtering efficiency of the particles can reach 100 percent, and PM is filtered 0.3 The filtering efficiency of the particles can reach 99 percent; and the substrate layer adopts non-woven fabric which can be degraded by biological enzyme, and is combined with the filter layer which can be degraded by ultraviolet light, so that the air filtration composite membrane material can be almost completely degraded.
Secondly, the invention adopts the amino alkyl silane coupling agent to modify the base material, enhances the binding force between the base material and the filter layer through chemical bonding, and effectively solves the problem that the nanofiber membrane is easy to fall off in use.
Thirdly, the preparation method of the air filtration composite membrane material can adopt a continuous electrostatic spinning process, so that the production efficiency is greatly improved, and the prepared air filtration composite membrane material can be applied to the fields of mask protective clothing, indoor air purification and the like.
Drawings
FIG. 1 is an SEM image of filter layer nanofibers in an air filtration composite membrane material obtained in example 1.
FIG. 2 is a graph showing the filtration performance and pressure drop of the air filtration composite membrane material obtained in example 1 over the spinning time.
Fig. 3 is an SEM image (left image) and EDS image (right image) of the modified base material nonwoven fabric obtained in example 2.
FIG. 4 is a degradation chart of the air filtration composite membrane material obtained in example 3.
Detailed Description
For a better understanding of the present invention, the following examples are set forth to illustrate the invention further, but are not to be construed as limiting the invention.
Example 1
An air filtration composite membrane material comprises a substrate layer and a filter layer, wherein the substrate layer is gamma-aminopropyl trimethoxysilane modified polylactic acid non-woven fabric; the filter layer is a polyamide 6 nanofiber membrane prepared by continuous electrostatic spinning. Wherein the thickness of the base material layer is 0.0930mm, the average diameter is 5 mu m, the thickness of the modified base material layer is 0.0960mm, the total thickness of the modified base material layer after being combined with the filter layer is 0.0966mm, and the average diameter of the nanofibers of the filter layer is 50nm. The porosity of the integral composite membrane material is about 70%, and the BET specific surface area is 19.7m 2 /g, substrate layer 97.5wt.% and filter layer 2.5wt.%.
The preparation method of the air filtration composite membrane material comprises the following specific steps:
(1) Deionized water and absolute ethyl alcohol with the volume ratio of 1:9 are prepared into a mixed solvent, and a silane coupling agent gamma-aminopropyl trimethoxysilane is selected to prepare into a solution with the concentration of 10 wt%; placing a polylactic acid (PLA) non-woven fabric roll with the width of 1m and the thickness of 0.0930mm on a feeding reel of a continuous electrostatic spinning machine, and preparing a silane coupling agent solutionPouring into a spray gun, starting an air pump to spray PLA non-woven fabric, and controlling the spraying amount to be 1mL/cm each time 2 Spraying for 2 times. After spray coating modification, the intermediate spinning chamber of the continuous electrostatic spinning machine is set to be dried at 40 ℃, other control parts of the spinning chamber are not started, and the winding speed is controlled to be 0.1m/min, so that the modified PLA non-woven fabric is obtained after winding, the thickness is 0.0933mm, and the modified PLA non-woven fabric is arranged on a supply reel.
(2) Taking formic acid as a solvent, preparing polyamide 6 spinning solution with the concentration of 12wt.%, coating the spinning solution on an electrode wire of an electrostatic spinning device through a pump and a mobile liquid supply device for high-voltage spinning, controlling the temperature in a spinning chamber to be 60 ℃, the humidity to be 20%, the spinning voltages to be 80KV respectively, the winding speed to be 0.2m/min respectively, and the spinning time to be 45min to have optimal performance, so as to obtain the polyamide 6 nanofiber membrane combined with the modified PLA non-woven fabric, namely the air filtration composite membrane material with the thickness of 0.0966mm.
The thickness of the sample is measured by a screw micrometer (precision 0.0001 mm), the thickness of the base material layer is 0.0930mm, the thickness of the modified base material layer is 0.0960mm, and the total thickness of the composite membrane material is 0.0966mm after the filter layer is combined. The BET specific surface area of the material is 19.7m measured by using a full-automatic specific surface area and porosity analyzer (ASAP 2460) and utilizing the principle of low-temperature nitrogen physical adsorption (static capacity method) 2 /g。
As can be seen from FIG. 1, the average diameter of the polyamide 6 fibers in the filter layer of the air filtration composite membrane material is 50nm. FIG. 2 is a graph showing PM of the air filtration composite membrane material obtained in example 1 over spinning time 0.3 Graph of filtration performance and air resistance, PM at 45min of spinning 0.3 The filtration efficiency reaches 99%.
Example 2
An air filtration composite membrane material comprises a substrate layer and a filter layer, wherein the substrate layer is gamma-aminopropyl triethoxysilane modified polylactic acid non-woven fabric; the filter layer is a polyamide 6 nanofiber membrane prepared by continuous electrostatic spinning. Wherein the thickness of the base material layer is 0.0900mm, the average diameter is 10 μm, the thickness of the modified base material layer is 0.0960mm, the total thickness is 0.1020mm after combining with the filter layer, and the filter layer is filteredThe average diameter of the nanofibers of the layer was 50nm. The porosity of the integral composite membrane material is about 75.5%, and the BET specific surface area is 20.0m 2 /g, substrate layer at 96.3wt.% and filter layer at 3.7wt.%.
(1) The preparation method of the air filtration composite membrane material comprises the following specific steps: deionized water and absolute ethyl alcohol with the volume of 1:5 are prepared into a mixed solvent, and a silane coupling agent gamma-aminopropyl triethoxysilane is selected to prepare into a solution with the concentration of 5wt percent. Placing a PLA non-woven fabric roll with the width of 1m and the thickness of 0.0900mm on a feeding roll of a continuous electrostatic spinning machine for drawing, pouring the prepared silane coupling agent solution into a spray gun, starting an air pump to spray the PLA non-woven fabric, and controlling the spraying amount to be 10ml/cm each time 2 And (3) spraying for 10 times, after spraying modification, setting the temperature of a spinning chamber in the middle of a continuous electrostatic spinning machine to be 35 ℃, and controlling the winding speed to be 0.2m/min without starting other control parts of the spinning chamber, namely, winding to obtain modified PLA non-woven fabrics with the thickness of 0.0960mm, and mounting the modified PLA non-woven fabrics on a feeding scroll.
(2) Taking formic acid as a solvent, preparing a spinning solution with the concentration of 13wt.% of polyamide 6 (PA 6), coating the spinning solution on an electrode wire through a pump and a mobile liquid supply device, controlling the temperature in a spinning chamber to be 60 ℃, the humidity to be 20%, the spinning voltage to be 60KV respectively, the spinning time to be 50min, and the winding speed to be 0.5m/min respectively, thereby obtaining the polyamide 6 nanofiber membrane combined with the modified PLA non-woven fabric, namely the air filtration composite membrane material, and the thickness to be 0.1020mm.
FIG. 3 is an SEM image of a modified PLA nonwoven fabric of this example, from which the average diameter of the nonwoven fabric was 10. Mu.m; from the EDS diagram (right) of the silicon-containing element of the modified PLA nonwoven fabric, it was found that the fiber surface was loaded with γ -aminopropyl triethoxysilane.
The porosity was calculated using the following method: the air filtration composite membrane of this example was cut into a size of 2cm×2cm, placed in a solvent, allowed to wet completely, soaked for 24 hours, taken out, rapidly filtered with paper to suck the surface liquid, and the mass m of the wet membrane was measured w Placing the sample in a vacuum oven, drying the film to constant weight, and measuring the mass m of the dry film d According to the following formulaAnd calculating the porosity of the composite membrane material, measuring each group of samples for 3 times, and taking an average value to obtain the porosity of the composite membrane material which is 75.5%.
Figure BDA0003695553720000061
Wherein epsilon is the porosity of the sample to be tested,%;
m w g is the mass of the sample to be tested in a wet state;
m d g is the mass of the sample to be tested in a dry state;
a is the surface area of the film in wet state, cm 2 ；
L is the surface area of the film in wet state, cm;
ρ is the density of the selected solvent, g/cm 3 。
Example 3
An air filtration composite membrane material comprises a substrate layer and a filter layer, wherein the substrate layer is gamma-aminopropyl triethoxysilane modified polylactic acid non-woven fabric; the filter layer is a polyamide 6 nanofiber membrane prepared by continuous electrostatic spinning. Wherein the thickness of the base material layer is 0.1500mm, the average diameter is 2 mu m, the thickness of the modified base material layer is 0.1520mm, the total thickness of the composite filtering membrane is 0.1600mm after the filtering layer is combined, and the average diameter of the nano fibers of the filtering layer is 70nm. The porosity of the integral composite membrane material is about 90%, and the BET specific surface area is 15.0m 2 /g, substrate layer at 95.5wt.% and filter layer at 4.5wt.%.
The preparation method of the air filtration composite membrane material comprises the following specific steps:
(1) Deionized water and absolute ethyl alcohol with the volume ratio of 1:20 are prepared into a mixed solvent, and a silane coupling agent gamma-aminopropyl triethoxysilane is selected to prepare into a solution with the concentration of 20 wt.%. Placing a PLA non-woven fabric roll with the width of 1m and the thickness of 0.1500mm on a feeding roll of a continuous electrostatic spinning machine for drawing, pouring the prepared silane coupling agent solution into a spray gun, starting an air pump to spray the PLA non-woven fabric, and controlling the spraying amount to be 10ml/cm each time 2 Spraying for 3 times. After the spraying modification, continuous electrostatic spinning is arrangedThe temperature of the spinning chamber in the middle of the silk machine is 50 ℃, other control parts of the spinning chamber are not started, the winding speed is controlled to be 0.2m/min, namely, the modified PLA non-woven fabric is obtained through winding, the thickness of the modified base material is 0.1520mm, and the modified PLA non-woven fabric is arranged on the feeding scroll.
(2) Taking formic acid as a solvent, preparing a spinning solution with the concentration of 12wt.% of polyamide 66, coating the spinning solution on an electrode wire through a pump and a mobile liquid supply device, controlling the temperature in a spinning chamber to be 50 ℃, the humidity to be 30%, the spinning voltages to be 80KV respectively, the spinning time to be 60min, the winding speed to be 0.2m/min respectively, and the thickness of the polyamide 66 nanofiber membrane combined with the modified PLA non-woven fabric, namely an air filtration composite membrane material, to be 0.1600mm.
The air filtration composite membrane material prepared in the embodiment is degraded by biological protease and ultraviolet irradiation, and the optical photograph of the air filtration material is shown in fig. 4. The air filtration composite membrane material prepared in the embodiment is firstly subjected to biodegradation by adopting proteinase k, the concentration is 0.5mg/ml, the pH is 9.0, the temperature is 60 ℃, the degradation time is 1d, and then the degradation is carried out by adopting ultraviolet light with the ultraviolet wavelength of 365nm for 3d. As can be seen from the optical photographs before and after degradation in fig. 4, the air filter material according to this example basically realizes complete degradation.
It is apparent that the above examples are only examples given for clarity of illustration and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. And thus obvious variations or modifications to the disclosure are within the scope of the invention.

Claims (10)

1. The air filtration composite membrane material is characterized by comprising a substrate layer and a filter layer, wherein the substrate layer is non-woven fabric modified by an amino hydrocarbon silane coupling agent; the filter layer is a polyamide polymer nanofiber membrane.
2. The air filtration composite membrane material according to claim 1,the method is characterized in that the thickness of the base material layer is 0.08-0.2 mm, the thickness of the filter layer is 0.001-0.010 mm, and the diameter of the nanofiber in the filter layer is 20-500 nm; the BET specific surface area of the air filtration composite membrane material is 0.5-20 m 2 And/g, the porosity is 60% -90%.
3. The air filtration composite membrane material according to claim 1, wherein the nonwoven fabric material is a degradable polymeric material and contains carboxyl functional groups.
4. The air filtration composite membrane material of claim 2, wherein the degradable polymer comprises polylactic acid, polyglycolic acid, amino acid polymers.
5. The air filtration composite membrane material of claim 1, wherein the polyamide-based polymer comprises polyamide 6, polyamide 610, polyamide 66, polyamide 11, polyamide 12, polyamide 1010, polyamide 56, polyamide 4, polyamide 8, polyamide 9, and polyamide 810; the amino alkyl silane coupling agent comprises gamma-amino propyl triethoxy silane, gamma-amino propyl trimethoxy silane, gamma- (beta-amino ethyl) amino propyl trimethoxy silane, gamma-urea propyl triethoxy silane, aniline methyl trimethyl silane and aniline methyl triethyl silane.
6. The method for preparing the air filtration composite membrane material according to claim 1, which is characterized by comprising the following steps:
(1) Preparing an amino alkyl silane coupling agent solution with the concentration of 1-20 wt.% by taking water and ethanol as mixed solvents, spraying the non-woven fabric, then controlling the temperature to be 35-55 ℃ for drying, and winding to obtain a modified non-woven fabric substrate;
(2) And (3) mounting the modified nonwoven fabric base material obtained in the step (1) on a feeding reel of an electrostatic spinning machine, and adopting a polyamide polymer solution as a spinning solution for continuous spinning to obtain a filter layer of a polyamide polymer nanofiber membrane combined with the modified nonwoven fabric base material, namely an air filtration composite membrane material.
7. The preparation method according to claim 6, wherein in the step (1), the mixed solvent is composed of deionized water and absolute ethyl alcohol in a volume ratio of 1:20-1:5.
8. The process according to claim 6, wherein in the step (1), the amount of each spray is 0.1 to 10mL/cm 2 The spraying times are 1-10 times.
9. The method according to claim 6, wherein in the step (2), the technological parameters of continuous electrospinning are as follows: the temperature of the spinning chamber is 20-60 ℃, the humidity is controlled to be less than or equal to 50%, the nozzle is needle-free, the spinning speed is 1-350 mm/s, the set voltage is 10-100 kV, the spinning time is 10-100 min, and the winding speed is controlled to be 0.1-2 m/min.
10. The method according to claim 6, wherein in the step (2), the spinning solution polyamide-based polymer solution is prepared in a spinning concentration of 10 to 15wt.% with one or a mixture of formic acid and acetic acid as a solvent.
CN202210678507.7A 2022-06-15 2022-06-15 Air filtration composite membrane material and preparation method thereof Pending CN116116109A (en)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102872654A (en) * 2012-09-28 2013-01-16 上海交通大学 Filtering material for mask and method for manufacturing filtering material
CN103230812A (en) * 2013-03-07 2013-08-07 苏州新纶超净技术有限公司 Photocatalytic air filtering material and preparation method thereof
CN105133187A (en) * 2015-07-22 2015-12-09 东华大学 Method for manufacturing electrospun nanofiber gas filtering material in mass manner
CN106039839A (en) * 2016-05-31 2016-10-26 武汉理工大学 Recyclable, efficient, efficient, low-resistance, antibacterial and haze-preventing air filtration material
CN113181711A (en) * 2021-04-26 2021-07-30 苏州和塑美科技有限公司 Degradable nanofiber air filtering material and preparation method thereof
CN113181781A (en) * 2021-04-28 2021-07-30 新材料与产业技术北京研究院 Preparation method of polylactic acid nanofiber filter element membrane, filter element membrane and application

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102872654A (en) * 2012-09-28 2013-01-16 上海交通大学 Filtering material for mask and method for manufacturing filtering material
CN103230812A (en) * 2013-03-07 2013-08-07 苏州新纶超净技术有限公司 Photocatalytic air filtering material and preparation method thereof
CN105133187A (en) * 2015-07-22 2015-12-09 东华大学 Method for manufacturing electrospun nanofiber gas filtering material in mass manner
CN106039839A (en) * 2016-05-31 2016-10-26 武汉理工大学 Recyclable, efficient, efficient, low-resistance, antibacterial and haze-preventing air filtration material
CN113181711A (en) * 2021-04-26 2021-07-30 苏州和塑美科技有限公司 Degradable nanofiber air filtering material and preparation method thereof
CN113181781A (en) * 2021-04-28 2021-07-30 新材料与产业技术北京研究院 Preparation method of polylactic acid nanofiber filter element membrane, filter element membrane and application

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