CN108722032B - Filter material for fresh air system of building - Google Patents
Filter material for fresh air system of building Download PDFInfo
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- CN108722032B CN108722032B CN201810363967.4A CN201810363967A CN108722032B CN 108722032 B CN108722032 B CN 108722032B CN 201810363967 A CN201810363967 A CN 201810363967A CN 108722032 B CN108722032 B CN 108722032B
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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
- B01D46/56—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with multiple filtering elements, characterised by their mutual disposition
- B01D46/62—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with multiple filtering elements, characterised by their mutual disposition connected in series
- B01D46/64—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with multiple filtering elements, characterised by their mutual disposition connected in series arranged concentrically or coaxially
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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
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
- B32B27/304—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl halide (co)polymers, e.g. PVC, PVDC, PVF, PVDF
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
- B32B27/308—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising acrylic (co)polymers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/34—Layered products comprising a layer of synthetic resin comprising polyamides
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/0007—Electro-spinning
- D01D5/0061—Electro-spinning characterised by the electro-spinning apparatus
- D01D5/0076—Electro-spinning characterised by the electro-spinning apparatus characterised by the collecting device, e.g. drum, wheel, endless belt, plate or grid
- D01D5/0084—Coating by electro-spinning, i.e. the electro-spun fibres are not removed from the collecting device but remain integral with it, e.g. coating of prostheses
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- 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
- D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
- D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
- D04H1/4282—Addition polymers
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- 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
- D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
- D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
- D04H1/4282—Addition polymers
- D04H1/43—Acrylonitrile series
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- 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
- D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
- D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
- D04H1/4326—Condensation or reaction polymers
- D04H1/4334—Polyamides
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- 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
- D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
- D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
- D04H1/4374—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece using different kinds of webs, e.g. by layering webs
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- 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
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- Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
- Nonwoven Fabrics (AREA)
- Artificial Filaments (AREA)
Abstract
The invention provides a filtering material for a fresh air system of a building, which sequentially comprises a PVC filtering membrane, a PAN filtering membrane, a microstructure PVC filtering membrane and a microstructure PA66 filtering membrane from bottom to top. According to the invention, through design, multiple types of single-layer filter materials are stacked through an electrostatic spinning method, the bonding force between the structures of the layers is good, and because the single-layer filter materials are multilayer materials of different types and different structures prepared by different methods, the probability of generating completely through gaps is very small, and the filtering effect is excellent.
Description
Technical Field
The invention relates to the field of air filtering materials, in particular to a filtering material for a fresh air system of a building.
Background
The fiber air filtering material has the characteristics of simple processing technology, product diversity, stable physical and chemical properties, low cost and the like, and is widely applied to the fields of air purification, individual protection, medical treatment and health, industrial dust removal and the like. The service performance of the filter device, such as filtration efficiency, energy consumption, dust holding capacity, service stability, service life and the like, mainly depends on the type and structure of the core filter material used. Currently, the major types of fiber filters used in industry are glass fibers, melt blown and needle punched fiber products. Since the nineties of the twentieth century, the high-performance filter material which takes the nano material as the main body is the heterophoria, and new vitality is injected for the development of the fiber filter material. With the increasing maturity of nanofiber material preparation technology and the diversification of raw materials, researchers have focused attention on the preparation of nanofiber materials and the application research of nanofiber materials in filtration. The electrostatic spinning is a new method for directly and continuously preparing the nano-fiber in recent years, and the technology has the advantages of strong operability, controllable process, good repeatability and the like. The electrostatic spinning nanofiber membrane has the characteristics of three-dimensional stable structure, controllable size and stacking structure, intercommunicating pore structure, small pore diameter, high specific surface area and the like, is favorable for filtering and separating ultrafine particles, and is an ideal nanofiber material for preparing high-performance filter devices.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Disclosure of Invention
The invention aims to provide a filter material for a fresh air system of a building, so that the defects of the prior art are overcome.
In order to achieve the purpose, the invention provides a filter material for a fresh air system of a building, which is characterized in that: the filtering material sequentially comprises a PVC filtering membrane, a PAN filtering membrane, a microstructure PVC filtering membrane and a microstructure PA66 filtering membrane from bottom to top.
Preferably, in the above technical solution, the PVC filter membrane is prepared by the following method: dissolving PVC in a mixed solvent of DMF and THF to obtain a first PVC spinning solution, wherein the concentration of the first PVC spinning solution is 10-12 wt%; stirring the first PVC spinning solution; and (3) carrying out electrostatic spinning by using the first PVC spinning solution after stirring to generate the PVC filtering membrane.
Preferably, in the above technical scheme, the specific process for producing the PVC filtration membrane by electrostatic spinning comprises: the spinning voltage is 20-25kV, the injection speed of the spinning solution is 3-5mL/h, and the distance between the spinning nozzle and the receiving plate is 10-15 cm.
Preferably, in the above technical solution, the PAN filtration membrane is prepared by the following method: dissolving PAN in DMF to obtain PAN spinning solution, wherein the concentration of the PAN spinning solution is 10-12 wt%; adding nano titanium dioxide powder into the PAN spinning solution to obtain a modified PAN spinning solution, wherein the concentration of the nano titanium dioxide powder is 10-12 wt%; stirring the modified PAN spinning solution; and (3) carrying out electrostatic spinning by using the stirred modified PAN spinning solution so as to generate a PAN filtering membrane on the surface of the PVC filtering membrane.
Preferably, in the above technical scheme, the specific process for generating the PAN filter membrane on the surface of the PVC filter membrane by electrostatic spinning is as follows: the spinning voltage is 30-35kV, the injection speed of the spinning solution is 4-6mL/h, and the distance between the spinning nozzle and the receiving plate is 20-25 cm.
Preferably, in the above technical solution, the microstructure PVC filter membrane is prepared by the following method: dissolving PVC powder in H2Obtaining a second PVC spinning solution in a mixed solvent of O and FA, wherein the concentration of the second PVC spinning solution is 10-12 wt%; stirring the second PVC spinning solution; and carrying out electrostatic spinning by using the second PVC spinning solution after stirring to generate the microstructure PVC filtering membrane on the surface of the PAN filtering membrane.
Preferably, in the above technical scheme, the specific process for generating the microstructure PVC filter membrane on the surface of the PAN filter membrane by electrostatic spinning is as follows: the spinning voltage is 35-40kV, the injection speed of the spinning solution is 0.3-0.6mL/h, and the distance between the spinning nozzle and the receiving plate is 20-25 cm.
Preferably, in the above technical solution, the microstructure PA66 filter membrane is prepared by the following method: dissolving PA66 in FA solvent to obtain PA66 spinning solution, wherein the concentration of the PA66 spinning solution is 10-12 wt%; stirring the PA66 spinning solution; and (3) carrying out electrostatic spinning by using the stirred PA66 spinning solution to generate a micro-structure PA66 filtering membrane on the surface of the micro-structure PVC filtering membrane.
Preferably, in the above technical scheme, the specific process for generating the microstructure PA66 filter membrane on the surface of the microstructure PVC filter membrane by electrostatic spinning is as follows: the spinning voltage is 25-30kV, the injection speed of the spinning solution is 0.7-1mL/h, and the distance between the spinning nozzle and the receiving plate is 10-15 cm.
Compared with the prior art, the invention has the following beneficial effects: the first layer of barrier material of the existing fresh air system is generally a non-woven fabric-like material generated by electrostatic spinning, the existing filter material is generally a single-layer structure or a simple multi-layer structure (for example, two layers with the same composition), and the traditional technology considers that the filter material with the simple structure has low manufacturing cost, high manufacturing speed and high yield. However, the inventor finds that internal and external connection often occurs in the gaps in the filter material with a simple structure, and although the pore channels of the gaps are staggered and criss-cross to form a 'labyrinth' channel, the contact area of air and the blocking material can be increased, the internal and external connection pore channels easily cause the air to flow through the pore channels preferentially, so that the contact time of the air and the filter material is shortened, and the blocking capability of the filter material is poor. According to the invention, through design, multiple types of single-layer filter materials are stacked through an electrostatic spinning method, the bonding force between the structures of the layers is good, and because the single-layer filter materials are multilayer materials of different types and different structures prepared by different methods, the probability of generating completely through gaps is very small, and the filtering effect is excellent.
Drawings
Fig. 1 is a schematic structural view of a filter material for a building fresh air system according to the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. It should be noted that, in order to prove the technical effects of the materials and methods proposed by the present invention, a plurality of examples and comparative examples are provided, the comparative examples are modifications on the basis of the examples, in order to ensure the simplicity and the emphasis of the description, only the differences between the comparative examples and the examples are shown, and the parts which are not written are considered to be consistent with example 4 by default.
Fig. 1 is a schematic structural view of a filter material for a building fresh air system according to the present invention. The filtering material sequentially comprises a PVC filtering membrane 101, a PAN filtering membrane 102, a microstructure PVC filtering membrane 103 and a microstructure PA66 filtering membrane 104 from bottom to top.
Example 1
The filtering material sequentially comprises a PVC filtering membrane, a PAN filtering membrane and a microstructure PV from bottom to topC filter membrane and microstructured PA66 filter membrane. The PVC filtering membrane is prepared by the following method: dissolving PVC in a mixed solvent of DMF and THF to obtain a first PVC spinning solution, wherein the concentration of the first PVC spinning solution is 10 wt%; stirring the first PVC spinning solution; and (3) carrying out electrostatic spinning by using the first PVC spinning solution after stirring to generate the PVC filtering membrane. The specific process for carrying out electrostatic spinning to generate the PVC filtering membrane comprises the following steps: the spinning voltage is 20kV, the injection speed of the spinning solution is 3mL/h, and the distance between a spinning nozzle and a receiving plate is 10 cm. The PAN filtration membrane is prepared by the following method: dissolving PAN in DMF to obtain PAN spinning solution, wherein the concentration of the PAN spinning solution is 10 wt%; adding nano titanium dioxide powder into the PAN spinning solution to obtain a modified PAN spinning solution, wherein the concentration of the nano titanium dioxide powder is 10 wt%; stirring the modified PAN spinning solution; and (3) carrying out electrostatic spinning by using the stirred modified PAN spinning solution so as to generate a PAN filtering membrane on the surface of the PVC filtering membrane. The specific process for carrying out electrostatic spinning to generate the PAN filtering membrane on the surface of the PVC filtering membrane comprises the following steps: the spinning voltage is 30kV, the injection speed of the spinning solution is 4mL/h, and the distance between a spinning nozzle and a receiving plate is 20 cm. The microstructure PVC filtering membrane is prepared by the following method: dissolving PVC powder in H2Obtaining a second PVC spinning solution in a mixed solvent of O and Formic Acid (FA), wherein the concentration of the second PVC spinning solution is 10 wt%; stirring the second PVC spinning solution; and carrying out electrostatic spinning by using the second PVC spinning solution after stirring to generate the microstructure PVC filtering membrane on the surface of the PAN filtering membrane. The specific process for carrying out electrostatic spinning to generate the microstructure PVC filtering membrane on the surface of the PAN filtering membrane comprises the following steps: the spinning voltage is 35kV, the injection speed of the spinning solution is 0.3mL/h, and the distance between the spinning nozzle and the receiving plate is 20 cm. The microstructure PA66 filter membrane is prepared by the following method: dissolving PA66 in FA solvent to obtain PA66 spinning solution, wherein the concentration of the PA66 spinning solution is 10 wt%; stirring the PA66 spinning solution; and (3) carrying out electrostatic spinning by using the stirred PA66 spinning solution to generate a micro-structure PA66 filtering membrane on the surface of the micro-structure PVC filtering membrane. The specific process for carrying out electrostatic spinning to generate the microstructure PA66 filter membrane on the surface of the microstructure PVC filter membrane comprises the following steps: the spinning voltage is 25kV, the injection speed of the spinning solution is 0.7mL/h, and the distance between the spinning nozzle and the receiving plate is 10 cm.
Example 2
The filtering material sequentially comprises a PVC filtering membrane, a PAN filtering membrane, a microstructure PVC filtering membrane and a microstructure PA66 filtering membrane from bottom to top. The PVC filtering membrane is prepared by the following method: dissolving PVC in a mixed solvent of DMF and THF to obtain a first PVC spinning solution, wherein the concentration of the first PVC spinning solution is 12 wt%; stirring the first PVC spinning solution; and (3) carrying out electrostatic spinning by using the first PVC spinning solution after stirring to generate the PVC filtering membrane. The specific process for carrying out electrostatic spinning to generate the PVC filtering membrane comprises the following steps: the spinning voltage is 25kV, the injection speed of the spinning solution is 5mL/h, and the distance between the spinning nozzle and the receiving plate is 15 cm. The PAN filtration membrane is prepared by the following method: dissolving PAN in DMF to obtain PAN spinning solution, wherein the concentration of the PAN spinning solution is 12 wt%; adding nano titanium dioxide powder into the PAN spinning solution to obtain a modified PAN spinning solution, wherein the concentration of the nano titanium dioxide powder is 12 wt%; stirring the modified PAN spinning solution; and (3) carrying out electrostatic spinning by using the stirred modified PAN spinning solution so as to generate a PAN filtering membrane on the surface of the PVC filtering membrane. The specific process for carrying out electrostatic spinning to generate the PAN filtering membrane on the surface of the PVC filtering membrane comprises the following steps: the spinning voltage is 35kV, the injection speed of the spinning solution is 6mL/h, and the distance between the spinning nozzle and the receiving plate is 25 cm. The microstructure PVC filtering membrane is prepared by the following method: dissolving PVC powder in H2Obtaining a second PVC spinning solution in a mixed solvent of O and FA, wherein the concentration of the second PVC spinning solution is 12 wt%; stirring the second PVC spinning solution; and carrying out electrostatic spinning by using the second PVC spinning solution after stirring to generate the microstructure PVC filtering membrane on the surface of the PAN filtering membrane. The specific process for carrying out electrostatic spinning to generate the microstructure PVC filtering membrane on the surface of the PAN filtering membrane comprises the following steps: the spinning voltage is 40kV, the injection speed of the spinning solution is 0.6mL/h, and the distance between the spinning nozzle and the receiving plate is 25 cm. The microstructure PA66 filter membrane is prepared by the following method: dissolving PA66 in FA solvent to obtain PA66 spinning solution, wherein the concentration of the PA66 spinning solution is 12 wt%; stirring the PA66 spinning solution; and (3) carrying out electrostatic spinning by using the stirred PA66 spinning solution to generate a micro-structure PA66 filtering membrane on the surface of the micro-structure PVC filtering membrane. The specific technology of electrostatic spinning is carried out to generate a microstructure PA66 filter membrane on the surface of the microstructure PVC filter membraneThe process comprises the following steps: the spinning voltage is 30kV, the injection speed of the spinning solution is 1mL/h, and the distance between the spinning nozzle and the receiving plate is 15 cm.
Example 3
The filtering material sequentially comprises a PVC filtering membrane, a PAN filtering membrane, a microstructure PVC filtering membrane and a microstructure PA66 filtering membrane from bottom to top. The PVC filtering membrane is prepared by the following method: dissolving PVC in a mixed solvent of DMF and THF to obtain a first PVC spinning solution, wherein the concentration of the first PVC spinning solution is 10.5 wt%; stirring the first PVC spinning solution; and (3) carrying out electrostatic spinning by using the first PVC spinning solution after stirring to generate the PVC filtering membrane. The specific process for carrying out electrostatic spinning to generate the PVC filtering membrane comprises the following steps: the spinning voltage is 21kV, the injection speed of the spinning solution is 3.5mL/h, and the distance between the spinning nozzle and the receiving plate is 11 cm. The PAN filtration membrane is prepared by the following method: dissolving PAN in DMF to obtain PAN spinning solution, wherein the concentration of the PAN spinning solution is 10.5 wt%; adding nano titanium dioxide powder into the PAN spinning solution to obtain a modified PAN spinning solution, wherein the concentration of the nano titanium dioxide powder is 10.5 wt%; stirring the modified PAN spinning solution; and (3) carrying out electrostatic spinning by using the stirred modified PAN spinning solution so as to generate a PAN filtering membrane on the surface of the PVC filtering membrane. The specific process for carrying out electrostatic spinning to generate the PAN filtering membrane on the surface of the PVC filtering membrane comprises the following steps: the spinning voltage is 31kV, the injection speed of the spinning solution is 4.5mL/h, and the distance between the spinning nozzle and the receiving plate is 21 cm. The microstructure PVC filtering membrane is prepared by the following method: dissolving PVC powder in H2Obtaining a second PVC spinning solution in a mixed solvent of O and FA, wherein the concentration of the second PVC spinning solution is 10.5 wt%; stirring the second PVC spinning solution; and carrying out electrostatic spinning by using the second PVC spinning solution after stirring to generate the microstructure PVC filtering membrane on the surface of the PAN filtering membrane. The specific process for carrying out electrostatic spinning to generate the microstructure PVC filtering membrane on the surface of the PAN filtering membrane comprises the following steps: the spinning voltage is 36kV, the injection speed of the spinning solution is 0.4mL/h, and the distance between the spinning nozzle and the receiving plate is 21 cm. The microstructure PA66 filter membrane is prepared by the following method: dissolving PA66 in FA solvent to obtain PA66 spinning solution, wherein the concentration of the PA66 spinning solution is 10.5 wt%; stirring the PA66 spinning solution; electrospinning using the stirred PA66 dope to impart a microstructureThe surface of the PVC filter membrane generates a micro-structure PA66 filter membrane. The specific process for carrying out electrostatic spinning to generate the microstructure PA66 filter membrane on the surface of the microstructure PVC filter membrane comprises the following steps: the spinning voltage is 26kV, the injection speed of the spinning solution is 0.8mL/h, and the distance between the spinning nozzle and the receiving plate is 11 cm.
Example 4
The filtering material sequentially comprises a PVC filtering membrane, a PAN filtering membrane, a microstructure PVC filtering membrane and a microstructure PA66 filtering membrane from bottom to top. The PVC filtering membrane is prepared by the following method: dissolving PVC in a mixed solvent of DMF and THF to obtain a first PVC spinning solution, wherein the concentration of the first PVC spinning solution is 11 wt%; stirring the first PVC spinning solution; and (3) carrying out electrostatic spinning by using the first PVC spinning solution after stirring to generate the PVC filtering membrane. The specific process for carrying out electrostatic spinning to generate the PVC filtering membrane comprises the following steps: the spinning voltage is 22kV, the injection speed of the spinning solution is 4mL/h, and the distance between a spinning nozzle and a receiving plate is 12 cm. The PAN filtration membrane is prepared by the following method: dissolving PAN in DMF to obtain PAN spinning solution, wherein the concentration of the PAN spinning solution is 11 wt%; adding nano titanium dioxide powder into the PAN spinning solution to obtain a modified PAN spinning solution, wherein the concentration of the nano titanium dioxide powder is 11 wt%; stirring the modified PAN spinning solution; and (3) carrying out electrostatic spinning by using the stirred modified PAN spinning solution so as to generate a PAN filtering membrane on the surface of the PVC filtering membrane. The specific process for carrying out electrostatic spinning to generate the PAN filtering membrane on the surface of the PVC filtering membrane comprises the following steps: the spinning voltage is 32kV, the injection speed of the spinning solution is 5mL/h, and the distance between the spinning nozzle and the receiving plate is 22 cm. The microstructure PVC filtering membrane is prepared by the following method: dissolving PVC powder in H2Obtaining a second PVC spinning solution in a mixed solvent of O and FA, wherein the concentration of the second PVC spinning solution is 11 wt%; stirring the second PVC spinning solution; and carrying out electrostatic spinning by using the second PVC spinning solution after stirring to generate the microstructure PVC filtering membrane on the surface of the PAN filtering membrane. The specific process for carrying out electrostatic spinning to generate the microstructure PVC filtering membrane on the surface of the PAN filtering membrane comprises the following steps: the spinning voltage is 37kV, the injection speed of the spinning solution is 0.5mL/h, and the distance between the spinning nozzle and the receiving plate is 23 cm. The microstructure PA66 filter membrane is prepared by the following method: dissolving PA66 in FA solvent to obtain PA66 spinning solution, wherein,the concentration of the PA66 spinning solution is 11 wt%; stirring the PA66 spinning solution; and (3) carrying out electrostatic spinning by using the stirred PA66 spinning solution to generate a micro-structure PA66 filtering membrane on the surface of the micro-structure PVC filtering membrane. The specific process for carrying out electrostatic spinning to generate the microstructure PA66 filter membrane on the surface of the microstructure PVC filter membrane comprises the following steps: the spinning voltage is 27kV, the injection speed of the spinning solution is 0.9mL/h, and the distance between the spinning nozzle and the receiving plate is 12 cm.
Comparative example 1
The filter material did not include the PAN filter membrane and the microstructured PVC filter membrane and accordingly the steps for preparing the PAN filter membrane and the microstructured PVC filter membrane were omitted and the microstructured PA66 filter membrane was prepared directly on the PVC filter membrane using the method of example 4.
Comparative example 2
The filter material did not include the PAN filter membrane and the microstructured PA66 filter membrane, and accordingly the steps for making the PAN filter membrane and the microstructured PA66 filter membrane were omitted, and the microstructured PVC filter membrane was made directly on the PVC filter membrane using the method of example 4.
Comparative example 3
A four-layer stacked PVC filtration membrane was formed using the method of example 4.
Comparative example 4
The concentration of the first PVC spinning solution is 15 wt%; the specific process for carrying out electrostatic spinning to generate the PVC filtering membrane comprises the following steps: the spinning voltage is 37kV, the injection speed of the spinning solution is 6mL/h, and the distance between the spinning nozzle and the receiving plate is 20 cm.
Comparative example 5
The concentration of the first PVC spinning solution is 15 wt%; the specific process for carrying out electrostatic spinning to generate the PVC filtering membrane comprises the following steps: the spinning voltage is 17kV, the injection speed of the spinning solution is 2mL/h, and the distance between a spinning nozzle and a receiving plate is 8 cm.
Comparative example 6
The concentration of the PAN spinning solution is 15 wt%; adding nano titanium dioxide powder into the PAN spinning solution to obtain a modified PAN spinning solution, wherein the concentration of the nano titanium dioxide powder is 15 wt%; the specific process for carrying out electrostatic spinning to generate the PAN filtering membrane on the surface of the PVC filtering membrane comprises the following steps: the spinning voltage is 40kV, the injection speed of the spinning solution is 8mL/h, and the distance between a spinning nozzle and a receiving plate is 27 cm.
Comparative example 7
The concentration of the PAN spinning solution is 8 wt%; adding nano titanium dioxide powder into the PAN spinning solution to obtain a modified PAN spinning solution, wherein the concentration of the nano titanium dioxide powder is 8 wt%; the specific process for carrying out electrostatic spinning to generate the PAN filtering membrane on the surface of the PVC filtering membrane comprises the following steps: the spinning voltage is 27kV, the injection speed of the spinning solution is 3mL/h, and the distance between a spinning nozzle and a receiving plate is 17 cm.
Comparative example 8
Without adding nano titanium dioxide powder
Comparative example 9
The concentration of the second PVC spinning solution is 15 wt%; the second PVC spinning solution was stirred. The specific process for carrying out electrostatic spinning to generate the microstructure PVC filtering membrane on the surface of the PAN filtering membrane comprises the following steps: the spinning voltage is 42kV, the injection speed of the spinning solution is 0.8mL/h, and the distance between the spinning nozzle and the receiving plate is 27 cm.
Comparative example 10
The concentration of the second PVC spinning solution is 8 wt%; the second PVC spinning solution was stirred. The specific process for carrying out electrostatic spinning to generate the microstructure PVC filtering membrane on the surface of the PAN filtering membrane comprises the following steps: the spinning voltage is 33kV, the injection speed of the spinning solution is 0.2mL/h, and the distance between the spinning nozzle and the receiving plate is 18 cm.
Comparative example 11
The PA66 spinning dope concentration was 15 wt%. The specific process for carrying out electrostatic spinning to generate the microstructure PA66 filter membrane on the surface of the microstructure PVC filter membrane comprises the following steps: the spinning voltage is 33kV, the injection speed of the spinning solution is 1.3mL/h, and the distance between the spinning nozzle and the receiving plate is 18 cm.
Comparative example 12
The concentration of the PA66 spinning solution is 8 wt%; the PA66 spinning solution was stirred. The specific process for carrying out electrostatic spinning to generate the microstructure PA66 filter membrane on the surface of the microstructure PVC filter membrane comprises the following steps: the spinning voltage is 23kV, the injection speed of the spinning solution is 0.5mL/h, and the distance between the spinning nozzle and the receiving plate is 8 cm.
The filtration efficiency test and the tensile strength test were performed for examples 1 to 4 and comparative examples 1 to 12, and in order to highlight the advantages of the present invention, the tensile strength of a commercially available single-layer PVC electrospinning filter of a certain brand was used as a standard sample (the tensile strength was set to 100%). The filtration efficiency test is to assemble the fresh air system with the filter materials of examples 1-4 and comparative examples 1-12 in sequence, and use the fresh air system to purify the air in the space with 100 cubic meters PM2.5 index of about 500, and test the PM2.5 index at the air outlet.
TABLE 1
The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and its practical application to enable one skilled in the art to make and use various exemplary embodiments of the invention and various alternatives and modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims and their equivalents.
Claims (1)
1. A filtering material for a fresh air system of a building comprises a PVC filtering membrane, a PAN filtering membrane, a microstructure PVC filtering membrane and a microstructure PA66 filtering membrane from bottom to top in sequence, wherein the PVC filtering membrane is prepared by the following method: dissolving PVC in a mixed solvent of DMF and THF to obtain a first PVC spinning solution, wherein the concentration of the first PVC spinning solution is 10.5 wt%; stirring the first PVC spinning solution; the first PVC spinning solution after stirring is utilized for electrostatic spinning to generate a PVC filtering membrane, and the specific process for generating the PVC filtering membrane by electrostatic spinning comprises the following steps: the spinning voltage is 21kV, the injection speed of the spinning solution is 3.5mL/h, the distance between a spinning nozzle and a receiving plate is 11cm, and the PAN filter membrane is prepared by the following method: dissolving PAN in DMF to obtain PAN spinning solution, wherein the concentration of the PAN spinning solution is 10.5 wt%; adding nano titanium dioxide powder into the PAN spinning solution to obtain a modified PAN spinning solution, wherein the concentration of the nano titanium dioxide powder is 10.5 wt%; stirring the modified PAN spinning solution; carrying out electrostatic spinning by using the stirred modified PAN spinning solution to generate a PAN filtering membrane on the surface of the PVC filtering membrane, carrying out electrostatic spinning, and generating the PAN filtering membrane on the surface of the PVC filtering membrane by using the specific process as follows: the spinning voltage is 31kV, the injection speed of the spinning solution is 4.5mL/h, the distance between a spinning nozzle and a receiving plate is 21cm, and the microstructure PVC filtering membrane is prepared by the following method: dissolving PVC powder in a mixed solvent of H2O and FA to obtain a second PVC spinning solution, wherein the concentration of the second PVC spinning solution is 10.5 wt%; stirring the second PVC spinning solution; and (3) performing electrostatic spinning by using the stirred second PVC spinning solution to generate a microstructure PVC filtering membrane on the surface of the PAN filtering membrane, and performing electrostatic spinning to generate the microstructure PVC filtering membrane on the surface of the PAN filtering membrane, wherein the specific process comprises the following steps: the spinning voltage is 36kV, the injection speed of the spinning solution is 0.4mL/h, the distance between a spinning nozzle and a receiving plate is 21cm, and the microstructure PA66 filter membrane is prepared by the following method: dissolving PA66 in FA solvent to obtain PA66 spinning solution, wherein the concentration of the PA66 spinning solution is 10.5 wt%; stirring the PA66 spinning solution; the method comprises the following specific steps of carrying out electrostatic spinning by using the stirred PA66 spinning solution to generate a microstructure PA66 filter membrane on the surface of the microstructure PVC filter membrane, and carrying out electrostatic spinning to generate a microstructure PA66 filter membrane on the surface of the microstructure PVC filter membrane: the spinning voltage is 26kV, the injection speed of the spinning solution is 0.8mL/h, and the distance between the spinning nozzle and the receiving plate is 11 cm.
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| CN102112196A (en) * | 2008-08-01 | 2011-06-29 | 纳幕尔杜邦公司 | Composite filter media |
| CN105080258A (en) * | 2014-04-15 | 2015-11-25 | 纳米新能源（唐山）有限责任公司 | Gas purification apparatus and vehicle air purification system using gas purification apparatus |
| CN107754493A (en) * | 2017-11-01 | 2018-03-06 | 陕西科技大学 | A kind of transparent PM2.5 filter membranes with photocatalytic and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102112196A (en) * | 2008-08-01 | 2011-06-29 | 纳幕尔杜邦公司 | Composite filter media |
| CN105080258A (en) * | 2014-04-15 | 2015-11-25 | 纳米新能源（唐山）有限责任公司 | Gas purification apparatus and vehicle air purification system using gas purification apparatus |
| CN107754493A (en) * | 2017-11-01 | 2018-03-06 | 陕西科技大学 | A kind of transparent PM2.5 filter membranes with photocatalytic and preparation method thereof |
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