CN119177569B - Preparation method and application of charge self-recovery electret composite porous membrane - Google Patents
Preparation method and application of charge self-recovery electret composite porous membrane Download PDFInfo
- Publication number
- CN119177569B CN119177569B CN202411688498.5A CN202411688498A CN119177569B CN 119177569 B CN119177569 B CN 119177569B CN 202411688498 A CN202411688498 A CN 202411688498A CN 119177569 B CN119177569 B CN 119177569B
- Authority
- CN
- China
- Prior art keywords
- porous membrane
- electret
- composite porous
- recovery
- preparing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000012528 membrane Substances 0.000 title claims abstract description 103
- 239000002131 composite material Substances 0.000 title claims abstract description 55
- 238000011084 recovery Methods 0.000 title claims abstract description 32
- 238000002360 preparation method Methods 0.000 title abstract description 13
- 239000002245 particle Substances 0.000 claims abstract description 39
- -1 polytetrafluoroethylene Polymers 0.000 claims abstract description 29
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims abstract description 24
- 239000004810 polytetrafluoroethylene Substances 0.000 claims abstract description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 20
- 238000000034 method Methods 0.000 claims abstract description 16
- 239000011259 mixed solution Substances 0.000 claims abstract description 10
- 238000002156 mixing Methods 0.000 claims abstract description 7
- 239000007788 liquid Substances 0.000 claims abstract description 5
- 229920000642 polymer Polymers 0.000 claims abstract description 5
- 239000000243 solution Substances 0.000 claims description 32
- 238000009987 spinning Methods 0.000 claims description 22
- 239000011148 porous material Substances 0.000 claims description 9
- WQZGKKKJIJFFOK-VFUOTHLCSA-N beta-D-glucose Chemical compound OC[C@H]1O[C@@H](O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-VFUOTHLCSA-N 0.000 claims description 8
- 229960001031 glucose Drugs 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 8
- 239000004205 dimethyl polysiloxane Substances 0.000 claims description 7
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 claims description 7
- 229920003171 Poly (ethylene oxide) Polymers 0.000 claims description 6
- 238000005245 sintering Methods 0.000 claims description 6
- 238000001523 electrospinning Methods 0.000 claims description 5
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 4
- 238000002347 injection Methods 0.000 claims description 4
- 239000007924 injection Substances 0.000 claims description 4
- 238000004528 spin coating Methods 0.000 claims description 4
- 229920005575 poly(amic acid) Polymers 0.000 claims description 3
- 229920005594 polymer fiber Polymers 0.000 claims description 3
- 239000011248 coating agent Substances 0.000 claims description 2
- 238000000576 coating method Methods 0.000 claims description 2
- 239000006185 dispersion Substances 0.000 claims description 2
- 230000010287 polarization Effects 0.000 claims description 2
- 239000011780 sodium chloride Substances 0.000 claims description 2
- 238000010041 electrostatic spinning Methods 0.000 abstract description 8
- 239000004642 Polyimide Substances 0.000 description 6
- 229920001721 polyimide Polymers 0.000 description 6
- 239000003094 microcapsule Substances 0.000 description 5
- 239000008367 deionised water Substances 0.000 description 4
- 229910021641 deionized water Inorganic materials 0.000 description 4
- 238000001914 filtration Methods 0.000 description 4
- 238000003860 storage Methods 0.000 description 4
- 239000004952 Polyamide Substances 0.000 description 3
- 239000002253 acid Substances 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 229920002647 polyamide Polymers 0.000 description 3
- WQZGKKKJIJFFOK-GASJEMHNSA-N Glucose Natural products OC[C@H]1OC(O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-GASJEMHNSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000008103 glucose Substances 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 239000002243 precursor Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000003989 dielectric material Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000007731 hot pressing Methods 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000001000 micrograph Methods 0.000 description 1
- 239000013618 particulate matter Substances 0.000 description 1
- 238000004987 plasma desorption mass spectroscopy Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
- D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
- D06N3/12—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof with macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. gelatine proteins
- D06N3/128—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof with macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. gelatine proteins with silicon polymers
-
- 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
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F8/00—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof
- D01F8/04—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers
- D01F8/10—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers with at least one other macromolecular compound obtained by reactions only involving carbon-to-carbon unsaturated bonds as constituent
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F8/00—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof
- D01F8/04—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers
- D01F8/16—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers with at least one other macromolecular compound obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds as constituent
-
- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
- D04H1/70—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres
- D04H1/72—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres the fibres being randomly arranged
- D04H1/728—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres the fibres being randomly arranged by electro-spinning
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
- D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
- D06N3/0002—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by the substrate
- D06N3/0011—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by the substrate using non-woven fabrics
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
- D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
- D06N3/0056—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by the compounding ingredients of the macro-molecular coating
- D06N3/0068—Polymeric granules, particles or powder, e.g. core-shell particles, microcapsules
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
- D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
- D06N3/007—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by mechanical or physical treatments
- D06N3/0077—Embossing; Pressing of the surface; Tumbling and crumbling; Cracking; Cooling; Heating, e.g. mirror finish
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
- D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
- D06N3/007—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by mechanical or physical treatments
- D06N3/0084—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by mechanical or physical treatments by electrical processes, e.g. potentials, corona discharge, electrophoresis, electrolytic
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
- D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
- D06N3/0086—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by the application technique
- D06N3/0088—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by the application technique by directly applying the resin
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N30/00—Piezoelectric or electrostrictive devices
- H10N30/80—Constructional details
- H10N30/85—Piezoelectric or electrostrictive active materials
- H10N30/857—Macromolecular compositions
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
- D06N2211/00—Specially adapted uses
- D06N2211/30—Filters
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Electrochemistry (AREA)
- Molecular Biology (AREA)
- Plasma & Fusion (AREA)
- Dispersion Chemistry (AREA)
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
- Laminated Bodies (AREA)
Abstract
The invention belongs to the technical field of electret porous films, and particularly discloses a preparation method and application of an electret composite porous film with self-recovery of charges, comprising the following steps of S1, dispersing water-soluble particles and polytetrafluoroethylene particles in curable polymer liquid according to a certain proportion, and uniformly mixing to obtain a mixed solution A; S2, preparing a lower porous membrane by adopting an electrostatic spinning method, S3, dispersing the mixed solution A obtained in S1 on the upper surface of the lower porous membrane obtained in S2, performing high-temperature curing, preparing an upper porous membrane on the lower porous membrane, S4, performing high-temperature water bath on the upper porous membrane obtained in S3 to obtain a composite porous membrane, and S5, performing corona charging on the composite porous membrane obtained in S4 to obtain the electret composite porous membrane. The preparation method and the application of the electret composite porous membrane with the self-recovery of the charges are simple to operate and stable in property, and the problems that the traditional electret porous membrane is easy to lose effectiveness and difficult to apply in high-humidity environment and in water conditions are solved.
Description
Technical Field
The invention relates to the technical field of electret porous films, in particular to a preparation method and application of a charge self-recovery electret composite porous film.
Background
Electrets refer to dielectric materials that can store space charges and dipole charges for long periods of time, and are commonly used in the manufacture of electret generators, electret filter membranes, and the like. Thus, electrets have a wide and important application in the field of energy environments. An important measure of electret performance is its stability in charge storage.
However, most electret materials belong to space charge electrets, most of the stored charges are located on the surface of the electret film and are easy to interfere with the outside, and when the electret material is touched with moisture, the retained charges can be quickly lost and cannot be automatically recovered.
In the prior art, the invention patent with publication number of CN113783462A discloses a microcapsule electret self-generating device and a preparation method thereof, according to the method, polytetrafluoroethylene, uncured polydimethylsiloxane and self-made charged microcapsules are assembled and then cured, and the self-made charged microcapsules are assembled with upper and lower electrodes, so that electret self-power generation is realized. However, the device has the defects of fine structures of the upper electrode, the lower electrode and the microcapsule, high preparation cost and dependence on a single-layer microcapsule structure in device power generation, and is easy to deform under the action of external force, so that the effect is unstable.
The invention patent with publication number CN106863994A discloses a charge self-recovery electret film, which stably stores charges through a hot-pressing groove structure, so that the charge self-recovery can be realized under the condition of external interference. However, the electret film is very compact, does not have air permeability, has a small application range, and is difficult to ensure higher charge recovery capability because the charge recovery only depends on an electric dipole generated by a groove structure under corona charging.
Disclosure of Invention
The invention aims to provide a preparation method and application of a charge self-recovery electret composite porous membrane, which are simple to operate, good in charge recovery performance and stable in property, and after external moisture interference disappears, the surface charge of the electret composite porous membrane can be automatically recovered, the charge recovery rate reaches 80-95%, and the problems that the traditional electret porous membrane is easy to lose efficacy and difficult to apply in a high-humidity environment and in a water-meeting condition can be effectively solved.
In order to achieve the above object, the present invention provides a method for preparing a charge self-recovering electret composite porous membrane, comprising the steps of:
S1, dispersing water-soluble particles and polytetrafluoroethylene particles in curable polymer liquid according to a certain proportion, and uniformly mixing to obtain a mixed solution A;
s2, preparing a lower porous membrane by adopting an electrostatic spinning method;
S3, dispersing the mixed solution A obtained in the S1 on the upper surface of the lower porous membrane obtained in the S2, and performing high-temperature curing to prepare an upper porous membrane on the lower porous membrane;
s4, carrying out high-temperature water bath on the upper porous membrane obtained in the step S3 to obtain a composite porous membrane;
s5, carrying out corona charging on the composite porous membrane obtained in the S4 to obtain the electret composite porous membrane.
Preferably, in S1, the curable polymer liquid is polydimethylsiloxane, the water-soluble particles are one or two of anhydrous glucose and sodium chloride particles, the particle size interval of the water-soluble particles is 0.1-1000 μm, and the particle size interval of the polytetrafluoroethylene particles is 0.2-1.6 μm.
Preferably, in the S1, the mass fraction of the water-soluble particles and the polytetrafluoroethylene particles is 15-35 wt%.
Preferably, in S2, the electrospinning method specifically includes:
According to a certain proportion, polytetrafluoroethylene solution and polyethylene oxide are mixed to prepare spinning solution A, polyamide acid solution is used as spinning solution B, double-needle electrostatic spinning is carried out by adopting the spinning solution A and the spinning solution B, and high-temperature sintering is carried out to obtain the polymer fiber membrane with the thickness of 10-100 mu m and the aperture interval of 50-100 mu m, wherein the electrostatic spinning voltage is 25kV, and the injection speed of the spinning solution is 0.1-1 ml.min -1.
Preferably, in S3, the dispersion is performed by spin coating or press coating, and the thickness of the upper porous film is 10 to 100 μm.
Preferably, in S3, the temperature of the high-temperature curing is 50-90 ℃ and the time is 3-5 hours.
Preferably, in S3, the pore size interval of the upper porous membrane is 100 to 2000 μm.
Preferably, in S4, the temperature of the high-temperature water bath is 50-80 ℃ and the time is 52-80 h.
Preferably, in S5, the corona charging adopts a polarization needle to face the central position of the upper porous membrane, the voltage is-5 to-15 kV, and the distance is 3-5 cm.
In order to achieve the above purpose, the invention also provides an application of the electret composite porous membrane prepared by the preparation method of the charge self-recovery electret composite porous membrane in a recyclable particulate matter filtering membrane and a piezoelectric material in a high-humidity environment.
Therefore, the preparation method and application of the electret composite porous membrane with the self-recovery of charges have the following beneficial effects:
(1) According to the invention, the polydimethylsiloxane and the polytetrafluoroethylene with larger difference of charge storage capacity are adopted, and more charges are concentrated on polytetrafluoroethylene particle interfaces embedded in the upper porous membrane and polytetrafluoroethylene fiber surfaces of the lower porous membrane during corona charging, so that after the polytetrafluoroethylene particles are contacted with moisture, the internal charges can be kept stable, and after the moisture interference disappears, the internal charges migrate to the surfaces, thereby realizing automatic recovery of the charges.
(2) According to the invention, polytetrafluoroethylene and polyimide are adopted, the polytetrafluoroethylene contains strong polar C-F bonds, when the polytetrafluoroethylene is used as an upper porous membrane doped particle and a lower porous membrane main body material, charges can be stably stored after corona charging, and in addition, polyimide with high mechanical strength is doped, so that the mechanical strength of the lower porous membrane is further increased on the premise of ensuring the charge storage capacity.
(3) The invention uses high-temperature water bath method to remove water-soluble particles in the upper porous film, to realize more simple and accurate pore-forming on the polymer fiber film, after corona charging, the inner holes of the electret composite porous film form electric dipoles, which are larger than the charge amount stored by the nonporous film, and after the moisture interference disappears, the electric dipoles of the inner holes can adsorb charges in the air to promote the automatic recovery of charges.
(4) The electret composite porous membrane prepared by the method has the characteristics of a moisture-resistant electret material and a porous material, can be used as an electret filter membrane in the field of industrial particle filtration, and can be used as a porous piezoelectric material in a high-humidity environment.
The technical scheme of the invention is further described in detail through the drawings and the embodiments.
Drawings
FIG. 1 is a schematic view of the structure and charge distribution of an embodiment of a charge self-healing electret composite porous membrane of the present invention;
FIG. 2 is a scanning electron microscope image of an embodiment of a charge self-recovering electret composite porous membrane of the present invention, wherein (a) is an upper porous membrane and (b) is a lower porous membrane;
FIG. 3 is a schematic diagram of the charge distribution during deionized water immersion in accordance with one embodiment of the present invention;
FIG. 4 is a schematic diagram of the charge distribution after the surface moisture disturbance has disappeared for an embodiment of a charge self-healing electret composite porous film of the present invention;
FIG. 5 is a graph of surface potential decay of an embodiment of a charge self-healing electret composite porous membrane of the invention, wherein (a) is a graph of surface potential versus time decay and (b) is a graph of surface potential versus cycle number decay.
Reference numerals
100. 200 Parts of lower porous membrane, 200 parts of upper porous membrane and 300 parts of deionized water.
Detailed Description
The technical scheme of the invention is further described below through the attached drawings and the embodiments.
Unless defined otherwise, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs.
As shown in fig. 1, an electret composite porous membrane with a charge self-recovery function includes a lower porous membrane 100 and an upper porous membrane 200, both of which store space charges and electric dipoles. As shown in FIG. 2, the upper porous film 200 has a non-dense film and surface-generated pores with a pore diameter smaller than 100 μm and a certain permeability, and the lower porous film 100 has a non-dense film and surface-generated pores with a pore diameter smaller than 100 μm and a larger porosity than the upper porous film 200.
The mechanism of the charge self-recovery function is that when the electret porous film is disturbed by external moisture, namely deionized water 300 is soaked in the electret porous film, the surface charge of the electret porous film is lost as shown in figure 3. As shown in fig. 4, when the surface moisture interference disappears, that is, when the electret porous film leaves the deionized water 300, charges of pores in the electret porous film and charges of the lower porous film 100 are spontaneously transferred to the surface, so that the surface charges are automatically recovered, and the electret porous film has the advantages of large charge storage amount and strong external interference resistance.
Example 1
A preparation method of an electret composite porous membrane with a charge self-recovery function comprises the following steps:
S1, adding polytetrafluoroethylene particles with the particle size of 1.2 mu m and anhydrous glucose particles into polydimethylsiloxane, wherein the mass fractions of the anhydrous glucose particles and the polytetrafluoroethylene particles are 20wt%, and uniformly mixing to obtain a mixed solution A.
S2, mixing 60wt% of polytetrafluoroethylene solution with 1.52wt% of polyethylene oxide to prepare spinning solution A, taking 25wt% of polyimide precursor polyamic acid solution as spinning solution B, carrying out double-needle electrostatic spinning by adopting the spinning solution A and the spinning solution B, and then sintering at high temperature, removing polyethylene oxide and simultaneously converting polyamic acid into polyimide to obtain the lower porous membrane 100, wherein the electrostatic spinning voltage is 25kV, the injection speed of the spinning solution is 0.1ml.min -1, the spinning time is 4h, and the high-temperature sintering temperature is 390 ℃.
And S3, spin-coating and dispersing the mixed solution A obtained in the step S1 on the upper surface of the lower porous membrane 100 obtained in the step S2, and curing at a high temperature to prepare the upper porous membrane 200 on the lower porous membrane 100. Wherein the high temperature curing temperature is 70 ℃ and the time is 4 hours.
And S4, performing high-temperature water bath on the upper porous membrane 200 obtained in the step S3, and removing internal glucose to obtain the composite porous membrane. Wherein the temperature of the high-temperature water bath is 60 ℃ and the time is 76h.
S5, carrying out corona charging on the composite porous membrane obtained in the S4 to obtain the electret composite porous membrane. The corona charging voltage used was-10 kV, and the distance between the polarizing needle and the center of the upper porous membrane 200 was 5cm.
Example two
A preparation method of an electret composite porous membrane with a charge self-recovery function comprises the following steps:
S1, adding polytetrafluoroethylene particles with the particle size of 0.2 mu m and anhydrous glucose particles into polydimethylsiloxane, wherein the mass fractions of the anhydrous glucose particles and the polytetrafluoroethylene particles are 25wt%, and uniformly mixing to obtain a mixed solution A.
S2, mixing 60wt% of polytetrafluoroethylene solution with 1.52wt% of polyethylene oxide to prepare spinning solution A, taking 25wt% of polyimide precursor polyamide acid solution as spinning solution B, carrying out double-needle electrostatic spinning by adopting the spinning solution A and the spinning solution B, and then sintering at high temperature, removing polyethylene oxide and simultaneously converting polyamide acid into polyimide to obtain the lower porous membrane 100, wherein the electrostatic spinning voltage is 25kV, the injection speed of the spinning solution is 1ml.min -1, the spinning time is 5h, and the high-temperature sintering temperature is 390 ℃.
And S3, spin-coating and dispersing the mixed solution A obtained in the step S1 on the upper surface of the lower porous membrane 100 obtained in the step S2, and curing at a high temperature to prepare the upper porous membrane 200 on the lower porous membrane 100. Wherein the high temperature curing temperature is 80 ℃ and the time is 4 hours.
And S4, performing high-temperature water bath on the upper porous membrane 200 obtained in the step S3, and removing internal glucose to obtain the composite porous membrane. Wherein the temperature of the high-temperature water bath is 60 ℃ and the time is 76h.
S5, carrying out corona charging on the composite porous membrane obtained in the S4 to obtain the electret composite porous membrane. The corona charging voltage used was-10 kV, and the distance between the polarizing needle and the center of the upper porous membrane 200 was 3cm.
Test
The electret composite porous membrane (PTFE-PDMS porous membrane) obtained in the first embodiment was used as a recyclable particulate filter membrane, and was mounted on an air filter, and a particle counter and a differential pressure meter were externally connected to both ends of the filter to detect the filtration efficiency and pressure drop. After filtering for a period of time, the electret composite porous membrane is soaked and cleaned in water, as shown in (a) of fig. 5, surface charges are annihilated by water, and then the electret composite porous membrane is taken out and dried, and internal charges of the electret composite porous membrane spontaneously migrate to the surface, so that the surface charges are automatically recovered.
The electret composite porous membrane (PDMS-PTFE composite membrane) obtained in the second example was immersed in water for 10 seconds and then taken out, the surface potential thereof was recovered to 95% of the original value, and as shown in (b) of FIG. 5, the surface charge was stably recovered to 80% or more of the original value after a plurality of cycles.
The composite electret porous membrane obtained in the second embodiment is prepared into a piezoelectric device, and when a certain pressure is applied, the electret composite porous membrane is contacted with an electrode, short-circuit current can be output. After water soaking, compared with the normal electret material losing the water-meeting charge, the device ensures the current output of a certain proportion due to the charge self-recovery characteristic of the electret composite porous membrane.
Therefore, the preparation method and the application of the electret composite porous membrane with the self-recovery of the electric charge are simple in operation, good in electric charge recovery performance and stable in property, after the external moisture interference disappears, the surface electric charge of the electret composite porous membrane can be automatically recovered, the electric charge recovery rate reaches 80-95%, and the problems that the traditional electret porous membrane is easy to lose efficacy and difficult to apply in high-humidity environment and under water conditions can be effectively solved.
It should be noted that the above-mentioned embodiments are merely for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solution of the present invention may be modified or substituted by the same, and the modified or substituted technical solution may not deviate from the spirit and scope of the technical solution of the present invention.
Claims (8)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202411688498.5A CN119177569B (en) | 2024-11-25 | 2024-11-25 | Preparation method and application of charge self-recovery electret composite porous membrane |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202411688498.5A CN119177569B (en) | 2024-11-25 | 2024-11-25 | Preparation method and application of charge self-recovery electret composite porous membrane |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN119177569A CN119177569A (en) | 2024-12-24 |
| CN119177569B true CN119177569B (en) | 2025-02-25 |
Family
ID=93898072
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202411688498.5A Active CN119177569B (en) | 2024-11-25 | 2024-11-25 | Preparation method and application of charge self-recovery electret composite porous membrane |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN119177569B (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114504951A (en) * | 2022-01-24 | 2022-05-17 | 华南理工大学 | A recyclable electret filter membrane and its preparation method, cleaning and charge regeneration method |
| CN115301086A (en) * | 2022-08-09 | 2022-11-08 | 烟台大学 | Perfluoropolymer-based composite nanofiltration membrane |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1528500A (en) * | 2003-10-16 | 2004-09-15 | 同济大学 | Preparation method of polytetrafluoroethylene electret porous filter membrane |
| JP2018103109A (en) * | 2016-12-27 | 2018-07-05 | 東洋紡株式会社 | Electret filter and method for manufacturing electret filter |
-
2024
- 2024-11-25 CN CN202411688498.5A patent/CN119177569B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114504951A (en) * | 2022-01-24 | 2022-05-17 | 华南理工大学 | A recyclable electret filter membrane and its preparation method, cleaning and charge regeneration method |
| CN115301086A (en) * | 2022-08-09 | 2022-11-08 | 烟台大学 | Perfluoropolymer-based composite nanofiltration membrane |
Also Published As
| Publication number | Publication date |
|---|---|
| CN119177569A (en) | 2024-12-24 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Ye et al. | Effects of liquid metal particles on performance of triboelectric nanogenerator with electrospun polyacrylonitrile fiber films | |
| Xu et al. | Carbon Nanotube Fiber Based Stretchable Wire-Shaped Supercapacitors. | |
| CN104795252B (en) | Ultra-thin Ti3C2The preparation method of the electrode of super capacitor of nanometer sheet self assembly | |
| CN107959049B (en) | Preparation method of gel electrolyte, gel electrolyte and lithium ion battery | |
| CN107221454B (en) | A kind of all-solid-state flexible supercapacitor and preparation method thereof based on porous carbon fiber cloth | |
| KR101530823B1 (en) | Fabrication of three-dimensional graphene structures decorated with carbon-layer coated metal-oxide nanofiber for flexible supercapacitor electrode | |
| CN107441848B (en) | A kind of silk fibroin nanofiltration membrane with micro-nano structure on the surface, preparation method and application thereof | |
| CN103247446A (en) | Fibrous super capacitor with coaxial structure and preparation method and application thereof | |
| Jabbarnia et al. | Investigating the thermal, mechanical, and electrochemical properties of PVdF/PVP nanofibrous membranes for supercapacitor applications | |
| CN104241601A (en) | Preparation method of metal-current-collector-free lithium battery or super-capacitor electrode | |
| CN113670487B (en) | A kind of composite flexible piezoresistive sensor based on bionic multilevel structure and preparation method thereof | |
| CN111883371A (en) | Flexible self-supporting electrode of supercapacitor and preparation method and application thereof | |
| CN108822586B (en) | A kind of preparation method of modified barium titanate material, battery separator and lithium ion battery | |
| CN107611341B (en) | Flexible electrode slice with coating layer and preparation method thereof | |
| CN119177569B (en) | Preparation method and application of charge self-recovery electret composite porous membrane | |
| CN113249060B (en) | Preparation method of polyvinylidene fluoride modified by lithium ion battery binder | |
| CN111330355B (en) | A kind of electret nanofiber high-efficiency filter material and preparation method thereof | |
| CN105679554A (en) | Preparation method for needle-shaped polyaniline/coal-based carbon nanofiber flexible supercapacitor | |
| CN111092186B (en) | Method for preparing PE-based lithium ion battery diaphragm based on self-assembly technology and application | |
| CN113223862A (en) | Activated sponge capacitor material and preparation method and application thereof | |
| CN112397849A (en) | A kind of high temperature resistant flame retardant battery separator and its preparation method and application | |
| Dissanayake et al. | High-efficiency dye-sensitized solar cells fabricated with electrospun PVdF-HFP polymer nanofibre-based gel electrolytes | |
| CN108539207B (en) | Nanofiber air battery cathode and preparation method thereof | |
| CN115497753B (en) | A preparation method of polyaniline/bamboo fiber/MXene composite material and its products and applications | |
| CN110180400A (en) | A kind of conductive-nano-fibers filter membrane and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |