CN111450635A - Multilayer antibacterial nanofiber air purification filter membrane and preparation process thereof - Google Patents
Multilayer antibacterial nanofiber air purification filter membrane and preparation process thereof Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/0001—Making filtering elements
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L9/00—Disinfection, sterilisation or deodorisation of air
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- 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
- B01D46/0027—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with additional separating or treating functions
- B01D46/0028—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with additional separating or treating functions provided with antibacterial or antifungal means
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B01D67/00—Processes specially adapted for manufacturing semi-permeable membranes for separation processes or apparatus
- B01D67/0079—Manufacture of membranes comprising organic and inorganic components
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D69/00—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor
- B01D69/02—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor characterised by their properties
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
- B01D71/06—Organic material
- B01D71/76—Macromolecular material not specifically provided for in a single one of groups B01D71/08 - B01D71/74
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D2323/00—Details relating to membrane preparation
- B01D2323/39—Electrospinning
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D2325/00—Details relating to properties of membranes
- B01D2325/48—Antimicrobial properties
Abstract
The invention provides a multilayer antibacterial nanofiber air purification filter membrane and a preparation process thereof, and the filter membrane comprises a first filter layer, a sterilization layer and a second filter layer, wherein the multilayer antibacterial nanofiber air purification filter membrane is of a three-layer structure, the first filter layer is arranged on the outer layer of the air filter membrane and consists of coarse nanofibers, the second filter layer is arranged on the bottom layer of the air filter membrane and consists of fine nanofibers, the sterilization layer is arranged between the first filter layer and the second filter layer, and the three-layer nanofiber composite material is adopted, so that the filtration efficiency reaches 99.9%, and the filtration efficiency and the killing rate of viruses and bacteria reach more than 95%.
Description
Technical Field
The invention relates to the field of air filtration membranes, in particular to a multilayer antibacterial nanofiber air purification filtration membrane and a preparation process thereof.
Background
In recent years, with the increasing year by year of environmental pollution, the content of tiny particulate matters such as dust and the like harmful to human bodies in the air is continuously increased, higher requirements are put forward on the protection effects such as the filtration precision, the antibacterial efficiency and the sterilization efficiency of the filtration protection material, and the human body health is seriously harmed, so that an air filtration membrane product with high filtration efficiency, high antibacterial rate and high sterilization rate and convenient use is urgently needed.
The graphene fiber has a unique antibacterial and bacteriostatic function, effectively inhibits the breeding of fungi, and has a remarkable antibacterial and deodorizing function. Ag + can strongly attract sulfhydryl (-SH) on protease in bacterial body, and rapidly combine with it to inactivate protease, resulting in bacterial death. When the bacteria are killed by the Ag +, the Ag + is dissociated from the bacterial corpses and is contacted with other bacterial colonies, and the process is repeatedly carried out, which is also the reason of the durability of the silver sterilization. Meanwhile, due to the mechanical adsorption and fixation effects of the nano-silver on the virus, the polymer with the thickness of 5-10 nm is covered on the surface of the nano-ultrafine particles, a large amount of protein and enzyme, especially polysaccharides can be fixed, and a large number of polysaccharide substances can prevent the adsorption of the virus and host cells and inhibit the combination of the virus and cell receptors, so that the strong antiviral activity is shown, the infection of the virus on the host cells is prevented, but Ag < + > is easily oxidized to form a protective layer, and the antibacterial effect is reduced.
Patent CN103774345B, the film that a graphite alkene and nanofiber combined together is proposed, but this air filter membrane single use graphite alkene is as the material that disinfects, and the ability of disinfecting is not enough, and this filter membrane uses single-layer structure, and graphite alkene is easily by the large granule pollution in the air, reduces bactericidal effect and graphite alkene drops easily after long-time the use and causes potential bodily injury.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a multilayer antibacterial nanofiber air purification filter membrane and a preparation process thereof, and solves the problems.
(II) technical scheme
In order to achieve the purpose, the invention is realized by the following technical scheme: the multilayer antibacterial nanofiber air purification filter membrane is of a three-layer structure, the first filter layer is arranged on the outer layer of the air filter membrane and consists of coarse nanofibers, the second filter layer is arranged on the bottom layer of the air filter membrane and consists of fine nanofibers, and the sterilization layer is arranged between the first filter layer and the second filter layer.
Preferably, the film thickness of the antibacterial nanofiber air purification filter membrane is 3-30 microns.
Preferably, the average diameter of the coarse nano-fibers in the first filter layer is 600-1000 nm.
Preferably, the average diameter of the nano-fibers of the bactericidal layer is 200-500 nm.
Preferably, the fine nanofibers in the second filter layer have an average diameter of 100-400 nanometers.
Preferably, the nanofiber material is specifically prepared by mixing one or more of PDVF, PES, PSF, PAN, PVA and PI with an organic solution and then carrying out an electrostatic spinning method.
Preferably, the organic solution is one of DMF, DMSO, and DMAC.
Preferably, the sterilization layer is specifically a nanofiber film doped with silver-loaded graphene
A preparation process of a multilayer antibacterial nanofiber air purification filter membrane comprises the following steps:
s1, mixing one or more of PDVF, PES, PSF and PAN with an organic solution to prepare a nanofiber spinning solution, uniformly stirring the solution, and dividing the solution into three groups for later use, wherein the mass ratio of PDVF, PES, PSF and PAN to the organic solvent is as follows: 5% -15%;
s2, weighing 0.2-0.6g of ethylenediamine graft modified graphene oxide, dispersing the graphene oxide in 100-300ml of DMF solution to form 0.02-0.06g/ml graphene oxide solution, adding 0.02-0.06g SDS into the graphene oxide solution, performing ultrasonic dispersion for one hour, adding 0.4-1.2g of silver nitrate crystal, stirring for 15-30min by using magnetic force, and then adding 0.028-0.084g of NaBH4Transferring the powder into a round-bottom flask with a magnetic stirrer, heating in water bath at 60 ℃, reacting in the dark for 1-2h, and standing for 24 h;
s3, after the solution in the S2 is placed still, filtering and washing are carried out, vacuum drying is carried out at the temperature of 60 ℃, silver-loaded graphene oxide particles are obtained, the silver-loaded graphene oxide particles are mixed with a group of nanofiber spinning solution prepared in the S1, the silver-loaded graphene spinning solution is prepared, and the mass ratio of the silver-loaded graphene to the nanofiber spinning solution is as follows: 0.1% -5%;
s4: and (3) sequentially injecting two groups of nanofiber spinning solutions in S1 and the silver-loaded graphene spinning solution in S3 into spinning electrodes, wherein the nanofiber spinning solutions are distributed on the spinning electrodes on two sides, the silver-loaded graphene spinning solution is placed on the middle spinning electrode, the spinning diameter is controlled by controlling parameters such as spinning voltage, spinning solution concentration and spinning electrode height, and the multilayer antibacterial nanofiber air purification filter membrane is prepared by adopting a one-step electrospinning method.
(III) advantageous effects
The invention provides a multilayer antibacterial nanofiber air purification filter membrane and a preparation process thereof, and the filter membrane has the following beneficial effects:
the invention adopts three layers of nano-fiber to be compounded layer by layer, greatly improves the filtering performance of the air filter membrane, and is provided with a sterilization layer, wherein the sterilization layer is a silver-loaded graphene nano-fiber film, the average diameter of the fiber is 200-500 nm, both Ag + and graphene have strong sterilization effect, the graphene is combined with Ag +, the reduction effect of the graphene is utilized to prevent Ag + from being oxidized, the sterilization effect of the sterilization layer is improved, meanwhile, the outer layer of the sterilization layer is provided with a first filter layer, the average molecular diameter of the first filter layer is 600-1000 nm, larger particles are effectively filtered, the particles are prevented from being attached to the sterilization layer to influence the sterilization and filtering effect of the sterilization layer, the inner side of the sterilization layer is provided with a second filter layer, the second filter layer adopts fine nano-fiber, the average molecular diameter of the second filter layer is 100-300 nm, the antibacterial nano-fiber air purification filter membrane has the advantages that the silver-loaded graphene in the sterilization layer can be prevented from falling off to cause potential personal injury when small molecular particles are further filtered, the spinning diameter of the three-layer membrane structure is controlled by adjusting parameters such as spinning voltage, spinning solution concentration and spinning electrode height through an electrostatic spinning method, the multi-layer antibacterial nano-fiber air purification filter membrane is directly spun through a one-step method, and large-scale mass production is facilitated.
Drawings
FIG. 1 is a schematic view of the overall structure of an air filtration membrane according to the present invention;
FIG. 2 is a schematic diagram of a one-step electrospinning spinning process according to the present invention;
FIG. 3 is an electron micrograph (front side) of a multi-layer antibacterial nanofiber air purification filter membrane;
FIG. 4 is an electron micrograph (cross section) of a multi-layer antibacterial nanofiber air purification filter membrane.
In the figure: 1 a first filter layer, 2 a sterilization layer and 3 a second filter layer.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
The following disclosure provides many different embodiments or examples for implementing different features of the invention. To simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, the present invention provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize applications of other processes and/or uses of other materials.
The first embodiment is as follows: the embodiment of the invention provides a multilayer antibacterial nanofiber air purification filter membrane and a preparation process thereof, wherein the multilayer antibacterial nanofiber air purification filter membrane is of a three-layer structure, the first filter layer 1 is arranged on the outer layer of the air filter membrane, the first filter layer 1 is composed of coarse nanofibers, the second filter layer 3 is arranged on the bottom layer of the air filter membrane, the second filter layer 3 is composed of fine nanofibers, and the sterilization layer 2 is arranged between the first filter layer 1 and the second filter layer 3.
The film thickness of the antibacterial nanofiber air purification filter membrane is 25 microns.
The average diameter of the coarse nanofibers in the first filter layer 1 is 1000 nanometers, the average diameter of the nanofibers in the sterilization layer 2 is 500 nanometers, the average diameter of the fine nanofibers in the second filter layer 3 is 400 nanometers, the nanofiber material is specifically prepared by mixing one or more of PDVF, PES, PSF, PAN, PVA and PI with an organic solution and then carrying out electrostatic spinning, the organic solution is one of DMF, DMSO and DMAC, and the sterilization layer 2 is specifically a nanofiber film doped with silver-loaded graphene
A preparation process of a multilayer antibacterial nanofiber air purification filter membrane comprises the following steps:
s1, mixing one or more of PDVF, PES, PSF and PAN with an organic solution to prepare a nanofiber spinning solution, uniformly stirring the solution, and dividing the solution into three groups for later use, wherein the mass ratio of PDVF, PES, PSF and PAN to the organic solvent is as follows: 10 percent;
s2, weighing 0.4g of ethylenediamine graft modified graphene oxide, dispersing the graphene oxide in 200ml of DMF solution to form 0.02g/ml graphene oxide solution, adding 0.04g of SDS into the graphene oxide solution, performing ultrasonic dispersion for one hour, adding 0.8g of silver nitrate crystal, stirring for 20min by using magnetic force, and then adding 0.06g of NaBH4Transferring the powder into a round-bottom flask with a magnetic stirrer, heating in water bath at 60 ℃, reacting in a dark place for 1.5h, and standing for 24 h;
s3, after the solution in the S2 is placed still, filtering and washing are carried out, vacuum drying is carried out at the temperature of 60 ℃, silver-loaded graphene oxide particles are obtained, the silver-loaded graphene oxide particles are mixed with a group of nanofiber spinning solution prepared in the S1, the silver-loaded graphene spinning solution is prepared, and the mass ratio of the silver-loaded graphene to the nanofiber spinning solution is as follows: 1 percent;
s4: and (3) sequentially injecting two groups of nanofiber spinning solutions in S1 and the silver-loaded graphene spinning solution in S3 into spinning electrodes, wherein the nanofiber spinning solutions are distributed on the spinning electrodes on two sides, the silver-loaded graphene spinning solution is placed on the middle spinning electrode, the spinning diameter is controlled by controlling parameters such as spinning voltage, spinning solution concentration and spinning electrode height, and the multilayer antibacterial nanofiber air purification filter membrane is prepared by adopting a one-step electrospinning method.
Example two: the embodiment of the invention provides a multilayer antibacterial nanofiber air purification filter membrane and a preparation process thereof, wherein the multilayer antibacterial nanofiber air purification filter membrane is of a three-layer structure, the first filter layer 1 is arranged on the outer layer of the air filter membrane, the first filter layer 1 is composed of coarse nanofibers, the second filter layer 3 is arranged on the bottom layer of the air filter membrane, the second filter layer 3 is composed of fine nanofibers, and the sterilization layer 2 is arranged between the first filter layer 1 and the second filter layer 3.
The film thickness of the antibacterial nanofiber air purification filter membrane is 25 microns.
The average diameter of the coarse nanofibers in the first filter layer 1 is 800 nanometers, the average diameter of the nanofibers in the sterilization layer 2 is 350 nanometers, the average diameter of the fine nanofibers in the second filter layer 3 is 250 nanometers, the nanofiber material is specifically prepared by mixing one or more of PDVF, PES, PSF, PAN, PVA and PI with an organic solution and then carrying out electrostatic spinning, the organic solution is one of DMF, DMSO and DMAC, and the sterilization layer 2 is specifically a nanofiber film doped with silver-loaded graphene
A preparation process of a multilayer antibacterial nanofiber air purification filter membrane comprises the following steps:
s1, mixing one or more of PDVF, PES, PSF and PAN with an organic solution to prepare a nanofiber spinning solution, uniformly stirring the solution, and dividing the solution into three groups for later use, wherein the mass ratio of PDVF, PES, PSF and PAN to the organic solvent is as follows: 10 percent;
s2, weighing 0.4g of ethylenediamine graft modified graphene oxide, dispersing in 200ml of DMF solution to form 0.02g/ml graphene oxide solution, and oxidizingAdding 0.04g SDS into the graphene solution, carrying out ultrasonic dispersion for one hour, adding 0.8g silver nitrate crystal, stirring for 20min by using magnetic force, and then adding 0.06g NaBH4Transferring the powder into a round-bottom flask with a magnetic stirrer, heating in water bath at 60 ℃, reacting in a dark place for 1.5h, and standing for 24 h;
s3, after the solution in the S2 is placed still, filtering and washing are carried out, vacuum drying is carried out at the temperature of 60 ℃, silver-loaded graphene oxide particles are obtained, the silver-loaded graphene oxide particles are mixed with a group of nanofiber spinning solution prepared in the S1, the silver-loaded graphene spinning solution is prepared, and the mass ratio of the silver-loaded graphene to the nanofiber spinning solution is as follows: 1 percent;
s4: and (3) sequentially injecting two groups of nanofiber spinning solutions in S1 and the silver-loaded graphene spinning solution in S3 into spinning electrodes, wherein the nanofiber spinning solutions are distributed on the spinning electrodes on two sides, the silver-loaded graphene spinning solution is placed on the middle spinning electrode, the spinning diameter is controlled by controlling parameters such as spinning voltage, spinning solution concentration and spinning electrode height, and the multilayer antibacterial nanofiber air purification filter membrane is prepared by adopting a one-step electrospinning method.
Example three: the embodiment of the invention provides a multilayer antibacterial nanofiber air purification filter membrane and a preparation process thereof, wherein the multilayer antibacterial nanofiber air purification filter membrane is of a three-layer structure, the first filter layer 1 is arranged on the outer layer of the air filter membrane, the first filter layer 1 is composed of coarse nanofibers, the second filter layer 3 is arranged on the bottom layer of the air filter membrane, the second filter layer 3 is composed of fine nanofibers, and the sterilization layer 2 is arranged between the first filter layer 1 and the second filter layer 3.
The film thickness of the antibacterial nanofiber air purification filter membrane is 25 microns.
The average diameter of the coarse nanofibers in the first filter layer 1 is 600 nanometers, the average diameter of the nanofibers in the sterilization layer 2 is 200 nanometers, the average diameter of the fine nanofibers in the second filter layer 3 is 100 nanometers, the nanofiber material is specifically prepared by mixing one or more of PDVF, PES, PSF, PAN, PVA and PI with an organic solution and then carrying out electrostatic spinning, the organic solution is one of DMF, DMSO and DMAC, and the sterilization layer 2 is specifically a nanofiber film doped with silver-loaded graphene
A preparation process of a multilayer antibacterial nanofiber air purification filter membrane comprises the following steps:
s1, mixing one or more of PDVF, PES, PSF and PAN with an organic solution to prepare a nanofiber spinning solution, uniformly stirring the solution, and dividing the solution into three groups for later use, wherein the mass ratio of PDVF, PES, PSF and PAN to the organic solvent is as follows: 10 percent;
s2, weighing 0.4g of ethylenediamine graft modified graphene oxide, dispersing the graphene oxide in 200ml of DMF solution to form 0.02g/ml graphene oxide solution, adding 0.04g of SDS into the graphene oxide solution, performing ultrasonic dispersion for one hour, adding 0.8g of silver nitrate crystal, stirring for 20min by using magnetic force, and then adding 0.06g of NaBH4Transferring the powder into a round-bottom flask with a magnetic stirrer, heating in water bath at 60 ℃, reacting in a dark place for 1.5h, and standing for 24 h;
s3, after the solution in the S2 is placed still, filtering and washing are carried out, vacuum drying is carried out at the temperature of 60 ℃, silver-loaded graphene oxide particles are obtained, the silver-loaded graphene oxide particles are mixed with a group of nanofiber spinning solution prepared in the S1, the silver-loaded graphene spinning solution is prepared, and the mass ratio of the silver-loaded graphene to the nanofiber spinning solution is as follows: 1 percent;
s4: and (3) sequentially injecting two groups of nanofiber spinning solutions in S1 and the silver-loaded graphene spinning solution in S3 into spinning electrodes, wherein the nanofiber spinning solutions are distributed on the spinning electrodes on two sides, the silver-loaded graphene spinning solution is placed on the middle spinning electrode, the spinning diameter is controlled by controlling parameters such as spinning voltage, spinning solution concentration and spinning electrode height, and the multilayer antibacterial nanofiber air purification filter membrane is prepared by adopting a one-step electrospinning method.
Example four: the air purification filter membrane comprises a first filter layer 1, a sterilization layer 2 and a second filter layer 3, wherein the multi-layer antibacterial nanofiber air purification filter membrane is of a three-layer structure, the first filter layer 1 is arranged on the outer layer of the air purification filter membrane, the first filter layer 1 is composed of coarse nanofibers, the second filter layer 3 is arranged on the bottom layer of the air purification filter membrane, the second filter layer 3 is composed of fine nanofibers, and the sterilization layer 2 is arranged between the first filter layer 1 and the second filter layer 3.
The film thickness of the antibacterial nanofiber air purification filter membrane is 25 microns.
The average diameter of the coarse nanofibers in the first filter layer 1 is 800 nanometers, the average diameter of the nanofibers in the sterilization layer 2 is 350 nanometers, the average diameter of the fine nanofibers in the second filter layer 3 is 250 nanometers, the nanofiber material is specifically prepared by mixing one or more of PDVF, PES, PSF, PAN, PVA and PI with an organic solution and then carrying out electrostatic spinning, the organic solution is one of DMF, DMSO and DMAC, and the sterilization layer 2 is specifically a nanofiber film doped with silver-loaded graphene
A preparation process of a multilayer antibacterial nanofiber air purification filter membrane comprises the following steps:
s1, mixing one or more of PDVF, PES, PSF and PAN with an organic solution to prepare a nanofiber spinning solution, uniformly stirring the solution, and dividing the solution into three groups for later use, wherein the mass ratio of PDVF, PES, PSF and PAN to the organic solvent is as follows: 10 percent;
s2, weighing 0.4g of ethylenediamine graft modified graphene oxide, dispersing the graphene oxide in 200ml of DMF solution to form 0.02g/ml graphene oxide solution, adding 0.04g of SDS into the graphene oxide solution, performing ultrasonic dispersion for one hour, adding 0.8g of silver nitrate crystal, stirring for 20min by using magnetic force, and then adding 0.06g of NaBH4Transferring the powder into a round-bottom flask with a magnetic stirrer, heating in water bath at 60 ℃, reacting in a dark place for 1.5h, and standing for 24 h;
s3, after the solution in the S2 is placed still, filtering and washing are carried out, vacuum drying is carried out at the temperature of 60 ℃, silver-loaded graphene oxide particles are obtained, the silver-loaded graphene oxide particles are mixed with a group of nanofiber spinning solution prepared in the S1, the silver-loaded graphene spinning solution is prepared, and the mass ratio of the silver-loaded graphene to the nanofiber spinning solution is as follows: 0.1 percent;
s4: and (3) sequentially injecting two groups of nanofiber spinning solutions in S1 and the silver-loaded graphene spinning solution in S3 into spinning electrodes, wherein the nanofiber spinning solutions are distributed on the spinning electrodes on two sides, the silver-loaded graphene spinning solution is placed on the middle spinning electrode, the spinning diameter is controlled by controlling parameters such as spinning voltage, spinning solution concentration and spinning electrode height, and the multilayer antibacterial nanofiber air purification filter membrane is prepared by adopting a one-step electrospinning method.
Example five: the air purification filter membrane comprises a first filter layer 1, a sterilization layer 2 and a second filter layer 3, wherein the multi-layer antibacterial nanofiber air purification filter membrane is of a three-layer structure, the first filter layer 1 is arranged on the outer layer of the air purification filter membrane, the first filter layer 1 is composed of coarse nanofibers, the second filter layer 3 is arranged on the bottom layer of the air purification filter membrane, the second filter layer 3 is composed of fine nanofibers, and the sterilization layer 2 is arranged between the first filter layer 1 and the second filter layer 3.
The film thickness of the antibacterial nanofiber air purification filter membrane is 25 microns.
The average diameter of the coarse nanofibers in the first filter layer 1 is 1000 nanometers, the average diameter of the nanofibers in the sterilization layer 2 is 500 nanometers, the average diameter of the fine nanofibers in the second filter layer 3 is 400 nanometers, the nanofiber material is specifically prepared by mixing one or more of PDVF, PES, PSF, PAN, PVA and PI with an organic solution and then carrying out electrostatic spinning, the organic solution is one of DMF, DMSO and DMAC, and the sterilization layer 2 is specifically a nanofiber film doped with silver-loaded graphene
A preparation process of a multilayer antibacterial nanofiber air purification filter membrane comprises the following steps:
s1, mixing one or more of PDVF, PES, PSF and PAN with an organic solution to prepare a nanofiber spinning solution, uniformly stirring the solution, and dividing the solution into three groups for later use, wherein the mass ratio of PDVF, PES, PSF and PAN to the organic solvent is as follows: 10 percent;
s2, weighing 0.4g of ethylenediamine graft modified graphene oxide, dispersing the graphene oxide in 200ml of DMF solution to form 0.02g/ml graphene oxide solution, adding 0.04g of SDS into the graphene oxide solution, performing ultrasonic dispersion for one hour, adding 0.8g of silver nitrate crystal, stirring for 20min by using magnetic force, and then adding 0.06g of NaBH4Transferring the powder into a round-bottom flask with a magnetic stirrer, heating in water bath at 60 ℃, reacting in a dark place for 1.5h, and standing for 24 h;
s3, after the solution in the S2 is placed still, filtering and washing are carried out, vacuum drying is carried out at the temperature of 60 ℃, silver-loaded graphene oxide particles are obtained, the silver-loaded graphene oxide particles are mixed with a group of nanofiber spinning solution prepared in the S1, the silver-loaded graphene spinning solution is prepared, and the mass ratio of the silver-loaded graphene to the nanofiber spinning solution is as follows: 5 percent;
s4: and (3) sequentially injecting two groups of nanofiber spinning solutions in S1 and the silver-loaded graphene spinning solution in S3 into spinning electrodes, wherein the nanofiber spinning solutions are distributed on the spinning electrodes on two sides, the silver-loaded graphene spinning solution is placed on the middle spinning electrode, the spinning diameter is controlled by controlling parameters such as spinning voltage, spinning solution concentration and spinning electrode height, and the multilayer antibacterial nanofiber air purification filter membrane is prepared by adopting a one-step electrospinning method.
Table 1: the sterilization efficiency, the filtration efficiency and the respiratory resistance detection results in each group of examples are compared:
although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. The utility model provides an antibiotic nanofiber air purification filter membrane of multilayer, includes first filter layer (1), layer (2) and second filter layer (3) disinfect, its characterized in that: the multi-layer antibacterial nanofiber air purification filter membrane is of a three-layer structure, the first filter layer (1) is arranged on the outer layer of the air filter membrane, the first filter layer (1) is composed of coarse nanofibers, the second filter layer (3) is arranged on the bottom layer of the air filter membrane, the second filter layer (3) is composed of fine nanofibers, and the sterilization layer (2) is arranged between the first filter layer (1) and the second filter layer (3).
2. The multi-layer antibacterial nanofiber air purification filter membrane as claimed in claim 1, wherein: the thickness of the film of the antibacterial nanofiber air purification filter membrane is 3-30 microns.
3. The multi-layer antibacterial nanofiber air purification filter membrane as claimed in claim 1, wherein: the average diameter of the coarse nano-fibers in the first filter layer (1) is 600-1000 nm.
4. The multi-layer antibacterial nanofiber air purification filter membrane as claimed in claim 1, wherein: the average diameter of the nano-fibers of the sterilizing layer (2) is 200-500 nm.
5. The multi-layer antibacterial nanofiber air purification filter membrane as claimed in claim 1, wherein: the average diameter of the fine nanofibers in the second filter layer (3) is 100-400 nm.
6. The multi-layer antibacterial nanofiber air purification filter membrane as claimed in claims 1, 2, 3, 4, 5, wherein: the nanofiber material is prepared by mixing one or more of PDVF, PES, PSF, PAN, PVA and PI with an organic solution and then carrying out an electrostatic spinning method.
7. The multi-layer antibacterial nanofiber air purification filter membrane as claimed in claim 6, wherein: the organic solution is one of DMF, DMSO and DMAC.
8. The multi-layer antibacterial nanofiber air purification filter membrane as claimed in claim 1, wherein: the sterilization layer (2) is specifically a nanofiber film doped with silver-loaded graphene.
9. A preparation process of a multilayer antibacterial nanofiber air purification filter membrane comprises the following steps:
s1: mixing one or more of PDVF, PES, PSF and PAN with an organic solution to prepare a nanofiber spinning solution, uniformly stirring the solution, and dividing the solution into three groups for later use, wherein the mass ratio of PDVF, PES, PSF, PAN to the organic solvent is as follows: 5% -15%;
s2: 0.2-0.6g of ethylenediamine graft modified graphene oxide is weighed and dispersed in 100-300ml of DMF solution to form 0.02-0.06g/ml of oxygenDissolving graphene solution, adding 0.02-0.06g SDS into graphene oxide solution, ultrasonically dispersing for one hour, adding 0.4-1.2g silver nitrate crystal, magnetically stirring for 15-30min, and adding 0.028-0.084g NaBH4Transferring the powder into a round-bottom flask with a magnetic stirrer, heating in water bath at 60 ℃, reacting in the dark for 1-2h, and standing for 24 h;
s3: and (3) after the solution in the S2 is stood, filtering and washing, performing vacuum drying at 60 ℃ to obtain silver-loaded graphene oxide particles, mixing the silver-loaded graphene oxide particles with a group of nanofiber spinning solution prepared in S1 to prepare the silver-loaded graphene spinning solution, wherein the mass ratio of the silver-loaded graphene to the nanofiber spinning solution is as follows: 0.1% -5%;
s4: and (3) sequentially injecting two groups of nanofiber spinning solutions in S1 and the silver-loaded graphene spinning solution in S3 into spinning electrodes, wherein the nanofiber spinning solutions are distributed on the spinning electrodes on two sides, the silver-loaded graphene spinning solution is placed on the middle spinning electrode, the spinning diameter is controlled by controlling parameters such as spinning voltage, spinning solution concentration and spinning electrode height, and the multilayer antibacterial nanofiber air purification filter membrane is prepared by adopting a one-step electrospinning method.
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