CN111249823A - Five-layer symmetrical polyimide nanofiber efficient and durable air filter - Google Patents
Five-layer symmetrical polyimide nanofiber efficient and durable air filter Download PDFInfo
- Publication number
- CN111249823A CN111249823A CN202010240277.7A CN202010240277A CN111249823A CN 111249823 A CN111249823 A CN 111249823A CN 202010240277 A CN202010240277 A CN 202010240277A CN 111249823 A CN111249823 A CN 111249823A
- Authority
- CN
- China
- Prior art keywords
- layer
- air filter
- supporting layer
- component
- diamine
- 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.)
- Pending
Links
Classifications
-
- 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
- B01D46/10—Particle separators, e.g. dust precipitators, using filter plates, sheets or pads having plane surfaces
-
- 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
- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
- B32B5/022—Non-woven fabric
-
- 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
- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/22—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
- B32B5/24—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer
- B32B5/26—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer another layer next to it also being fibrous or filamentary
-
- 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
- D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
- D01F6/58—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolycondensation products
- D01F6/74—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolycondensation products from polycondensates of cyclic compounds, e.g. polyimides, polybenzimidazoles
-
- 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
- D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
- D01F6/78—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from copolycondensation products
-
- 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
- B32B2250/00—Layers arrangement
- B32B2250/05—5 or more layers
-
- 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
- B32B2250/00—Layers arrangement
- B32B2250/20—All layers being fibrous or filamentary
-
- 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
- B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
- B32B2262/02—Synthetic macromolecular fibres
-
- 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
- B32B2307/00—Properties of the layers or laminate
- B32B2307/20—Properties of the layers or laminate having particular electrical or magnetic properties, e.g. piezoelectric
- B32B2307/206—Insulating
-
- 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
- B32B2307/00—Properties of the layers or laminate
- B32B2307/30—Properties of the layers or laminate having particular thermal properties
- B32B2307/306—Resistant to heat
-
- 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
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/71—Resistive to light or to UV
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- General Chemical & Material Sciences (AREA)
- Nonwoven Fabrics (AREA)
- Filtering Materials (AREA)
Abstract
The invention relates to the field of high polymer materials, in particular to a five-layer symmetrical polyimide nanofiber efficient and durable air filter disc. The polyamide acid solution is prepared by electrostatic spinning; the preparation raw material of the polyamic acid solution comprises a component A and a component B; the component A is aromatic dianhydride; the component B is bipyrimidine diamine and/or aromatic diamine. In the invention, the inner side and the outer side of the core filtering function layer are symmetrically provided with the superfine fiber function supporting layer and the thicker fiber strong supporting layer, and the fibers with different diameters of each layer are mutually lapped and woven into a three-dimensional reticular structure to trap particles and germs in the environment layer by layer. In addition, because the outermost strong supporting layer is thick in fiber, large in strength and large in pore size, the direction of particles in the environment is changed due to the reaction of inertia and force after the particles collide on the surface of the outermost strong supporting layer, and the particles are settled or adhered to the outermost strong supporting layer, so that the core filtering function layer can be effectively protected.
Description
Technical Field
The invention relates to the field of high polymer materials, in particular to a five-layer symmetrical polyimide nanofiber efficient and durable air filter disc.
Background
Along with the aggravation of urban air pollution, the haze weather is gradually increased, the air pollution can not only generate destructive influence on surrounding objects through physical, chemical and biological erosion, but also generate serious toxic action on respiratory systems, nervous systems, immunocompetence, skins and the like of people through parts such as respiratory systems, skins and the like of people by polluted gas. For this reason, people often use protective masks to filter and purify inhaled air. The traditional mask is made of gauze, which does not conform to the national standard of medical sanitation protection.
The conventional protective mask is generally made of polypropylene, polyethylene and other materials, is of a single-layer or multi-layer symmetrical structure prepared by an SM melt-blown process, and mainly achieves the effect of filtering micro particles and microorganisms in air through pores formed by non-woven fabrics. However, since the melt strength of polyethylene, polypropylene and other materials in the melt-blowing process is low, although the diameter of the nonwoven fabric fiber can be adjusted by adjusting the magnitude of the electrostatic force, when preparing ultrafine fibers or nano-sized fibers, the continuity, stability and uniformity of the fibers are hindered to some extent, so that the filtration performance of the fibers is affected. In addition, because the mechanical properties of the non-woven fabrics prepared by polyethylene, polypropylene and the like serving as materials need to be improved, the bonding force between every two layers of fibers and between the layers is weak, the microporous structure of the non-woven fabrics is easy to damage and the filtering performance of the non-woven fabrics is greatly influenced when the non-woven fabrics are subjected to washing, ultraviolet sterilization and other operations, so that the non-woven fabrics cannot be repeatedly used for many times and even can only be used as disposable products.
Disclosure of Invention
In order to solve the technical problems, the invention provides a five-layer symmetrical polyimide nanofiber efficient and durable air filter disc which is prepared by performing electrostatic spinning on a polyamic acid solution; the preparation raw material of the polyamic acid solution comprises a component A and a component B; the component A is aromatic dianhydride; the component B is bipyrimidine diamine and/or aromatic diamine.
As a preferable embodiment, the aromatic diamine is one or more selected from diphenyl ether diamine, triphenyl diether diamine, bisphenol a type diamine, p-phenylene diamine, m-phenylene diamine, benzimidazole diphenyl diamine, 5 '-bis (4-aminophenoxy) -2, 2' -bipyrimidine, and 2, 2-bis [4- (3-aminophenoxy) phenyl ] propane.
As a preferred technical scheme, the aromatic dianhydride is selected from one or more of pyromellitic dianhydride, 3 ', 4, 4' -benzophenone tetracarboxylic dianhydride, biphenyl dianhydride, diphenyl ether dianhydride, benzophenone dianhydride and triphendiether dianhydride, and bis- (3, 4-phthalic anhydride) dimethylsilane; preferably, the aromatic dianhydride is 3,3 ', 4, 4' -benzophenone tetracarboxylic dianhydride or bis- (3, 4-phthalic anhydride) dimethylsilane.
As a preferable technical scheme, the five-layer symmetrical polyimide nanofiber efficient durable air filter disc sequentially comprises a first strong supporting layer, a first functional supporting layer, a filtering functional layer, a second functional supporting layer and a second strong supporting layer; the thickness of the filtering functional layer is 0.5-3.0 μm; the thickness of the functional supporting layer is 5-10 μm; the thickness of the strong supporting layer is 10-50 mu m.
As a preferable technical scheme, the fiber diameter of the filtering functional layer is 0.05-0.5 μm; the fiber diameter of the functional supporting layer is 0.5-1.0 mu m; the fiber diameter of the strong supporting layer is 1-5 mu m.
The second aspect of the invention provides a preparation method of the five-layer symmetrical polyimide nanofiber high-efficiency durable air filter disc, which comprises the following steps:
step one, preparation of spinning solution: uniformly mixing an equimolar amount of the component A and the component B in an organic solvent, mechanically stirring, and reacting for 4-12 hours at the temperature of not higher than 10 ℃ under the protection of nitrogen to obtain the spinning solution;
step two, electrostatic spinning: arranging five groups of electrostatic spinning heads on a line in sequence, extruding and electrospinning, and sequentially layering polyamide acid fibers formed by electrospinning and falling on a steel conveyor belt to form a five-layer composite structure non-woven fabric with different fiber diameters;
step three, thermal imidization: and introducing the non-woven fabric with the five-layer composite structure into a high-temperature furnace through a conveyor belt, and imidizing at 200-400 ℃ to form the five-layer symmetrical polyimide nanofiber efficient and durable air filter.
As a preferable technical scheme, the spinning solution comprises a filtering function layer spinning solution, and the absolute viscosity of the filtering function layer spinning solution is 0.6-1.4 Pa.S.
As a preferable technical scheme, the spinning solution comprises a functional supporting layer spinning solution, and the absolute viscosity of the functional supporting layer spinning solution is 1.8-3.0 Pa.S.
The third aspect of the invention provides the application of the five-layer symmetrical polyimide nanofiber high-efficiency durable air filter disc in the medical protection field.
Has the advantages that: in the invention, the inner side and the outer side of the core filtering function layer are symmetrically provided with the superfine fiber function supporting layer and the thicker fiber strong supporting layer, and the fibers with different diameters of each layer are mutually lapped and woven into a three-dimensional reticular structure to trap particles and germs in the environment layer by layer. In addition, because the outermost strong supporting layer is thick in fiber, large in strength and large in pore size, the direction of particles in the environment is changed due to the reaction of inertia and force after the particles collide on the surface of the outermost strong supporting layer, and the particles are settled or adhered to the outermost strong supporting layer, so that the core filtering function layer can be effectively protected. And because the diameters of the outermost layer and the secondary outer layer are relatively thick, the formed three-dimensional net structure is relatively stable, and trapped particles are easily removed when the fiber is subjected to sterilization treatment processing required by repeated use such as water boiling, water washing, high-temperature baking, ultraviolet radiation or microwave heating, so that the porosity of the fiber is basically consistent before and after treatment, and the filtering efficiency of the fiber is not lost. The thermal decomposition temperature of the obtained five-layer symmetrical polyimide nanofiber efficient and durable air filter is more than 540 ℃, and the air filter is resistant to boiling by water; resisting ultraviolet radiation; high insulation; electrostatically charged (electrostatic voltages greater than 2000 volts); porosity exceeds 90%; the average pore diameter of the functional layer is about 0.2 micron, the pressure difference under the air flow rate of 85L/min is about less than 210Pa, and the interception rate of particles with the particle size of more than 0.3 micron is more than 99.9%. And baking the mixture in a baking oven at 150 ℃ for 2 hours, taking out the mixture, boiling the mixture for 45min, drying the mixture, and repeating the operation for 50 times to simulate the disinfection treatment process required by repeated use, wherein the interception rate of the particles with the particle size of more than 0.3 micrometer is still more than 95%.
Detailed Description
The disclosure may be understood more readily by reference to the following detailed description of preferred embodiments of the invention and the examples included therein. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. In case of conflict, the present specification, including definitions, will control.
The terms "comprises," "comprising," "includes," "including," "has," "having," "contains," "containing," or any other variation thereof, as used herein, are intended to cover a non-exclusive inclusion. For example, a composition, process, method, article, or apparatus that comprises a list of elements is not necessarily limited to only those elements but may include other elements not expressly listed or inherent to such composition, process, method, article, or apparatus.
When an amount, concentration, or other value or parameter is expressed as a range, preferred range, or as a range of upper preferable values and lower preferable values, this is to be understood as specifically disclosing all ranges formed from any pair of any upper range limit or preferred value and any lower range limit or preferred value, regardless of whether ranges are separately disclosed. For example, when a range of "1 to 5" is disclosed, the described range should be interpreted to include the ranges "1 to 4", "1 to 3", "1 to 2 and 4 to 5", "1 to 3 and 5", and the like. When a range of values is described herein, unless otherwise stated, the range is intended to include the endpoints thereof and all integers and fractions within the range.
In addition, the indefinite articles "a" and "an" preceding an element or component of the invention are not intended to limit the number requirement (i.e., the number of occurrences) of the element or component. Thus, "a" or "an" should be read to include one or at least one, and the singular form of an element or component also includes the plural unless the stated number clearly indicates that the singular form is intended.
In this document, relational terms such as first, second, third, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions.
The invention provides a five-layer symmetrical polyimide nanofiber efficient and durable air filter disc, which is prepared by performing electrostatic spinning on a polyamic acid solution; the preparation raw material of the polyamic acid solution comprises a component A and a component B; the component A is aromatic dianhydride; the component B is bipyrimidine diamine and/or aromatic diamine.
The polyimide macromolecule main chain contains a large amount of nitrogenous five-membered heterocyclic rings, benzene rings, ether bonds, carbonyl bonds and amido bonds, the amido bond is particularly important, and the carbon and the oxygen in the aromatic ring are connected by double bonds and the conjugated effect of the aromatic heterocyclic ring effectively enhances the binding energy, when radiation is most used for polyimide fibers, the radiation absorbed by the molecule is far from sufficient to open the covalent bonds between atoms in the molecular chain, and due to the molecular structure, so that the polyimide fiber can resist high radiation, high temperature and chemical corrosion, has difficult molecular chain fracture, better thermal stability and excellent mechanical property, the method has good application prospect in the fields of atomic energy industry, space environment, aerospace, national defense construction, novel buildings, high-speed vehicles, ocean development, sports equipment, new energy, environmental industry, protective tools and the like.
The aromatic diamine in the present invention refers to a diamine having a molecular structure containing a benzene ring, and may be a diamine having a symmetric structure or a diamine having an asymmetric structure, including, but not limited to, a diamine having a molecular structure further containing a structure such as imidazole, cycloalkane, alkylene oxide, etc. The aromatic diamine does not include aromatic diamines having an imidazole structure in the molecular structure.
In some embodiments, the aromatic diamine is selected from one or more of diphenyl ether diamine, triphenyl diether diamine, bisphenol a type diamine, p-phenylene diamine, m-phenylene diamine, benzimidazole diphenyl diamine, 2-bis [4- (3-aminophenoxy) phenyl ] propane.
Further, the aromatic diamine is 2, 2-bis [4- (3-aminophenoxy) phenyl ] propane.
The aromatic dianhydride is dianhydride obtained by dehydrating tetrabasic acid containing benzene rings in a molecular structure, the specific structure of the dianhydride is not particularly limited, and the dianhydride can be symmetrical aromatic dianhydride or asymmetrical aromatic dianhydride, and can contain components such as organic silicon and the like besides the benzene ring structure.
In some embodiments, the aromatic dianhydride is selected from one or more of pyromellitic dianhydride, 3 ', 4, 4' -benzophenone tetracarboxylic dianhydride, biphenyl dianhydride, diphenyl ether dianhydride, benzophenone dianhydride, triphendiether dianhydride, bis- (3, 4-phthalic anhydride) dimethylsilane.
More preferably, the aromatic dianhydride is 3,3 ', 4, 4' -benzophenone tetracarboxylic dianhydride or bis- (3, 4-phthalic anhydride) dimethylsilane.
The bis- (3, 4-phthalic anhydride) dimethylsilane has the following structure:
in the process of completing the invention, the applicant finds that the aromatic dianhydride with a specific structure is selected, so that the heat stability of the air filter sheet can be improved, the characteristics of water boiling resistance, high-temperature baking resistance and the like can be improved, and the reuse rate of the air filter sheet can be increased. The hygroscopicity of the mask can be increased, the uncomfortable feeling caused by the exhaled moisture is reduced, and the use comfort of the mask is effectively improved.
In some embodiments, the bipyrimidinyl diamine is 5,5 ' -bis [ P- (4-aminophenoxy) phenoxy ] bipyrimidine and/or 5,5 ' -bis (4-aminophenoxy) -2,2 ' -bipyrimidine.
Further preferably, the bipyrimidinyl diamine is 5,5 '-bis (4-aminophenoxy) -2, 2' -bipyrimidine. The 5,5 '-bis (4-aminophenoxy) -2, 2' -bipyrimidine has the following structure:
in some embodiments, the five-layer symmetrical polyimide nanofiber high-efficiency durable air filter comprises a first strong support layer, a first functional support layer, a filtering functional layer, a second functional support layer and a second strong support layer in sequence; the thickness of the filtering functional layer is 0.5-3.0 μm; the thickness of the functional supporting layer is 5-10 μm; the thickness of the strong supporting layer is 10-50 mu m.
Further, the fiber diameter of the filtering functional layer is 0.05-0.5 μm; the fiber diameter of the functional supporting layer is 0.5-1.0 mu m; the fiber diameter of the strong supporting layer is 1-5 mu m.
In the five-layer symmetrical polyimide nanofiber efficient and durable air filter disc, the first/fifth layers (the outermost/inner layers) are thick fiber strong supporting layers, the second/fourth layers are superfine fiber functional supporting layers, and the third layer, namely the middle layer with five layers of symmetrical structures, is a filtering core functional layer formed by polyimide nanofibers. According to the invention, electrostatic spinning film layers with different fiber sizes are stacked according to fibers with specific diameter sizes, a strong supporting layer of thicker fibers is used as an inner layer and an outer layer of the filter disc, a functional supporting layer of superfine fibers is used as a secondary outer layer, and then a nanofiber layer is arranged between the functional supporting layers, so that the five-layer symmetrical polyimide nanofiber efficient durable air filter disc is obtained.
In the invention, the inner side and the outer side of the core filtering function layer are symmetrically provided with the superfine fiber function supporting layer and the thicker fiber strong supporting layer, and the fibers with different diameters of each layer are mutually lapped and woven into a three-dimensional reticular structure to trap particles and germs in the environment layer by layer. In addition, because the outermost strong supporting layer is thick in fiber, large in strength and large in pore size, the direction of particles in the environment is changed due to the reaction of inertia and force after the particles collide on the surface of the outermost strong supporting layer, and the particles are settled or adhered to the outermost strong supporting layer, so that the core filtering function layer can be effectively protected. And because the diameters of the outermost layer and the secondary outer layer are relatively thick, the formed three-dimensional net structure is relatively stable, and trapped particles are easily removed when the fiber is subjected to sterilization treatment processing required by repeated use such as water boiling, water washing, high-temperature baking, ultraviolet radiation or microwave heating, so that the porosity of the fiber is basically consistent before and after the treatment, and the filtering efficiency is not lost. In addition, the applicant reasonably selects the polyamide acid to prepare the monomers, and a large number of rigid benzene ring structures in polyimide structures prepared by the monomers are utilized, so that the prepared air filter has high thermal stability, good ultraviolet radiation performance and high edge bonding performance, and the air filter has good hygroscopicity, and the discomfort caused by the fact that the face is always in a damp and hot environment due to the damp and hot air exhaled in the wearing process is avoided.
The second aspect of the invention provides a preparation method of the five-layer symmetrical polyimide nanofiber high-efficiency durable air filter disc, which comprises the following steps:
step one, preparation of spinning solution: uniformly mixing an equimolar amount of the component A and the component B in an organic solvent, mechanically stirring, and reacting for 4-12 hours at the temperature of not higher than 10 ℃ under the protection of nitrogen to obtain the spinning solution;
step two, electrostatic spinning: arranging five groups of electrostatic spinning heads on a line in sequence, extruding and electrospinning, and sequentially layering polyamide acid fibers formed by electrospinning and falling on a steel conveyor belt to form a five-layer composite structure non-woven fabric with different fiber diameters;
step three, thermal imidization: and introducing the non-woven fabric with the five-layer composite structure into a high-temperature furnace through a conveyor belt, and imidizing at 200-400 ℃ to form the five-layer symmetrical polyimide nanofiber efficient and durable air filter.
The spinning solution is obtained by dissolving preparation monomers of polyamic acid in an organic solvent and reacting at low temperature under the protection of nitrogen, the concentration of the spinning solution is controlled according to the content of the solvent, and the spinning solutions with different concentrations are obtained to be used for spinning different layers of an air filter sheet, so that the diameter of fibers obtained by electrostatic spinning is controlled. The polyamic acid preparation monomers of different layers in the invention can be the same or different.
In the present invention, the organic solvent for dissolving the polyamic acid preparation monomer is not particularly limited, and includes, but is not limited to, N-Dimethylacetamide (DMAC), N-Dimethylformamide (DMF), or 1-methyl-2-pyrrolidone (NMP).
In some embodiments, the dope comprises a filtration function layer dope having an absolute viscosity of 0.6 to 1.4 pa.s.
Further, the mass concentration of the spinning solution of the filter function layer is 6%.
In some embodiments, the dope comprises a functional support layer dope having an absolute viscosity of 1.8 to 3.0 pa.s; further, the absolute viscosity thereof was 2.0Pa.S
Further, the mass concentration of the functional support layer spinning solution is 12%.
In some embodiments, the dope comprises an intensive support layer dope having an absolute viscosity of 3.0 to 8.0 pa.s.
Further, the mass concentration of the spinning solution for the strong support layer is 20%.
Further, the preparation method of the five-layer symmetrical polyimide nanofiber efficient and durable air filter comprises the following steps:
step one, preparation of spinning solution: uniformly mixing an equimolar amount of the component A and the component B in an organic solvent, mechanically stirring, and reacting for 4-12 hours at the temperature of not higher than 10 ℃ under the protection of nitrogen to obtain the spinning solution;
step two, arranging five groups of electrostatic spinning heads on one line in sequence, wherein the first group has three heads, the mass concentration of the polyamic acid spinning solution is about 20%, and the absolute viscosity is 3.0-8.0 Pa.S; the mass concentration of the polyamic acid spinning solution is about 12%, and the absolute viscosity is 1.8-3.0 Pa.S; the third group of heads has the mass concentration of the polyamic acid spinning solution of about 6 percent and the absolute viscosity of 0.6-1.4 Pa.S; the fourth group of two ends, the mass concentration of the polyamic acid spinning solution is about 12%, and the absolute viscosity is 1.8-3.0 Pa.S; a fifth group of three heads, wherein the mass concentration of the polyamic acid spinning solution is about 20%, and the absolute viscosity is 3.0-8.0 Pa.S;
step three, the polyamic acid superfine fiber or the nano fiber formed by electrospinning is sequentially dropped on the steel conveyer belt in five layers to form a five-layer composite structure with different fiber diametersThe non-woven fabric is led into a high-temperature furnace through a conveyor belt to be imidized at the temperature of 200-400 ℃ to form the polyimide super air filter disc, and the plane size of the filter disc is 120-150-200-250 cm2。
The third aspect of the invention provides the application of the five-layer symmetrical polyimide nanofiber high-efficiency durable air filter disc in the medical protection field.
Examples
Example 1: the five-layer symmetrical polyimide nanofiber efficient and durable air filter disc comprises a five-layer composite structure, wherein a first strong supporting layer, a first functional supporting layer, a filtering functional layer, a second functional supporting layer and a second strong supporting layer are sequentially arranged; wherein the preparation raw materials, the layer thickness and the fiber diameter of the first strong supporting layer and the second strong supporting layer are the same; the preparation raw materials, the layer thickness and the fiber diameter of the first functional supporting layer and the second functional supporting layer are the same. The thickness of the filtering functional layer is 1.8 mu m, and the fiber diameter of the filtering functional layer is 0.08 mu m; the thickness of the functional supporting layer is 8 μm, and the diameter of the functional supporting layer is 0.7 μm; the thickness of the strong support layer is 30 μm, and the diameter thereof is 2.5 μm.
The preparation method of the five-layer symmetrical polyimide nanofiber efficient and durable air filter comprises the following steps:
step one, preparation of spinning solution: uniformly mixing equimolar amounts of the component A and the component B in N, N-dimethylformamide, mechanically stirring, and reacting for 8 hours at 5 ℃ under the protection of nitrogen to obtain the spinning solution;
step two, arranging five groups of electrostatic spinning heads on a line in sequence, wherein the first group of electrostatic spinning heads has the mass concentration of about 20 percent and the absolute viscosity of 4.8 Pa.S; the mass concentration of the polyamic acid spinning solution is about 12%, and the absolute viscosity is 2.0 Pa.S; the third group of heads has the mass concentration of the polyamic acid spinning solution of about 6 percent and the absolute viscosity of 0.8 Pa.S; the fourth group has two ends, the mass concentration of the polyamic acid spinning solution is about 12%, and the absolute viscosity is 2.0 Pa.S; a fifth group of three heads, wherein the mass concentration of the polyamic acid spinning solution is about 20 percent, and the absolute viscosity is 4.8 Pa.S;
step three, electrospinningThe formed polyamide acid superfine fiber or nano fiber is sequentially dropped on a steel conveyer belt in five layers to form a non-woven fabric with a five-layer composite structure with different fiber diameters, the non-woven fabric is led into a high-temperature furnace through the conveyer belt to be imidized at 380 ℃ to form a polyimide super air filter, and the plane size of the filter is 160 x 220cm2. Wherein the component A is bis- (3, 4-phthalic anhydride) dimethylsilane, and the component B is 5,5 '-bis (4-aminophenoxy) -2, 2' -bipyrimidine.
The thermal decomposition temperature of the five-layer symmetrical polyimide nanofiber efficient and durable air filter disc in the embodiment is about 556 ℃, and the air filter disc is resistant to boiling by water; resisting ultraviolet radiation; high insulation; electrostatically charged (electrostatic voltages greater than 2000 volts); porosity about 94%; the average pore diameter of the functional layer is about 0.2 micron, the pressure difference under the air flow rate of 85L/min is about 209Pa, and the interception rate of particles with the particle size of more than 0.3 micron is more than 99.9%. And baking the mixture in a baking oven at 150 ℃ for 2 hours, taking out the mixture, boiling the mixture for 45min, drying the mixture, and repeating the operation for 50 times to simulate the repeated use process, wherein the interception rate of the particles with the particle size of more than 0.3 micrometer is still more than 98.0%. Moreover, when the medical protective cover is installed on the medical protective cover, 8 used people all think that the medical protective cover has remarkable moisture absorption effect and high wearing comfort.
Example 2: the five-layer symmetrical polyimide nanofiber efficient and durable air filter disc comprises a five-layer composite structure, wherein a first strong supporting layer, a first functional supporting layer, a filtering functional layer, a second functional supporting layer and a second strong supporting layer are sequentially arranged; wherein the preparation raw materials, the layer thickness and the fiber diameter of the first strong supporting layer and the second strong supporting layer are the same; the preparation raw materials, the layer thickness and the fiber diameter of the first functional supporting layer and the second functional supporting layer are the same. The thickness of the filtering functional layer is 1.8 mu m, and the fiber diameter of the filtering functional layer is 0.08 mu m; the thickness of the functional supporting layer is 8 μm, and the diameter of the functional supporting layer is 0.7 μm; the thickness of the strong support layer is 30 μm, and the diameter thereof is 2.5 μm.
The preparation method of the five-layer symmetrical polyimide nanofiber efficient and durable air filter comprises the following steps:
step one, preparation of spinning solution: uniformly mixing equimolar amounts of the component A and the component B in N, N-dimethylformamide, mechanically stirring, and reacting for 8 hours at 5 ℃ under the protection of nitrogen to obtain the spinning solution;
step two, arranging five groups of electrostatic spinning heads on a line in sequence, wherein the mass concentration of the polyamic acid spinning solution in the first group is about 20%; the mass concentration of the polyamic acid spinning solution at the two ends of the second group is about 12%; the third group of heads has the mass concentration of the polyamic acid spinning solution of about 6 percent; the fourth group has two ends, and the mass concentration of the polyamic acid spinning solution is about 12 percent; a fifth group of three heads, wherein the mass concentration of the polyamic acid spinning solution is about 20%;
step three, sequentially dividing the polyamic acid superfine fibers or the nano fibers formed by electrospinning into five layers, falling the polyamide acid superfine fibers or the nano fibers on a steel conveyor belt to form a five-layer composite structure non-woven fabric with different fiber diameters, introducing the non-woven fabric into a high-temperature furnace through the conveyor belt, and imidizing the polyamide acid superfine fibers or the nano fibers at 380 ℃ to form the polyimide super air filter, wherein the plane size of the filter is 160 x 220cm2. Wherein the component A is bis- (3, 4-phthalic anhydride) dimethylsilane, and the component B is 2, 2-bis [4- (3-aminophenoxy) phenyl]Propane.
The five-layer symmetrical polyimide nanofiber efficient and durable air filter disc in the embodiment is resistant to boiling by water; resisting ultraviolet radiation; high insulation; electrostatically charged (electrostatic voltages greater than 2000 volts); the pressure difference at 85L/min air flow rate is about 218Pa, and the interception rate of the particles with the particle size of more than 0.3 micrometer is more than 99.9%. And baking the mixture in a baking oven at 150 ℃ for 2 hours, taking out the mixture, boiling the mixture in water for 45min, drying the mixture, and repeating the operation for 50 times to simulate the repeated use process, wherein the interception rate of the particles with the particle size of more than 0.3 micrometer is about 94.5%. Moreover, the medical protective cover is installed on a medical protective cover, 5 used people all think that the medical protective cover has remarkable moisture absorption effect, and the wearing comfort level is high.
Example 3: the five-layer symmetrical polyimide nanofiber efficient and durable air filter disc comprises a five-layer composite structure, wherein a first strong supporting layer, a first functional supporting layer, a filtering functional layer, a second functional supporting layer and a second strong supporting layer are sequentially arranged; wherein the preparation raw materials and the layer thicknesses of the first strong supporting layer and the second strong supporting layerThe diameters of the fibers are the same; the preparation raw materials, the layer thickness and the fiber diameter of the first functional supporting layer and the second functional supporting layer are the same. The thickness of the filtering functional layer is 1.8 mu m, and the fiber diameter of the filtering functional layer is 0.08 mu m; the thickness of the functional supporting layer is 8 μm, and the diameter of the functional supporting layer is 0.7 μm; the thickness of the strong support layer is 30 μm, and the diameter thereof is 2.5 μm.
The preparation method of the five-layer symmetrical polyimide nanofiber efficient and durable air filter comprises the following steps:
step one, preparation of spinning solution: uniformly mixing equimolar amounts of the component A and the component B in N, N-dimethylformamide, mechanically stirring, and reacting for 8 hours at 5 ℃ under the protection of nitrogen to obtain the spinning solution;
step two, arranging five groups of electrostatic spinning heads on a line in sequence, wherein the mass concentration of the polyamic acid spinning solution in the first group is about 20%; the mass concentration of the polyamic acid spinning solution at the two ends of the second group is about 12%; the third group of heads has the mass concentration of the polyamic acid spinning solution of about 6 percent; the fourth group has two ends, and the mass concentration of the polyamic acid spinning solution is about 12 percent; a fifth group of three heads, wherein the mass concentration of the polyamic acid spinning solution is about 20%;
step three, sequentially dividing the polyamic acid superfine fibers or the nano fibers formed by electrospinning into five layers, falling the polyamide acid superfine fibers or the nano fibers on a steel conveyor belt to form a five-layer composite structure non-woven fabric with different fiber diameters, introducing the non-woven fabric into a high-temperature furnace through the conveyor belt, and imidizing the polyamide acid superfine fibers or the nano fibers at 380 ℃ to form the polyimide super air filter, wherein the plane size of the filter is 160 x 220cm2. The component A is 3,3 ', 4, 4' -benzophenone tetracarboxylic dianhydride, and the component B is diphenyl diamine.
The five-layer symmetrical polyimide nanofiber efficient and durable air filter in the embodiment is highly insulating; electrostatically charged (electrostatic voltages greater than 2000 volts); the pressure difference at 85L/min air flow rate is about 221Pa, and the interception rate of the particles with the particle size of more than 0.3 micrometer is more than 99.9%. And baking the mixture in a baking oven at 150 ℃ for 2 hours, taking out the mixture, boiling the mixture for 45min, drying the mixture, and repeating the operation for 50 times to simulate the repeated use process, wherein the interception rate of the particles with the particle size of more than 0.3 micrometer is 90%. Moreover, when the medical protective cover is installed on a medical protective cover, 5 used people do not think that the medical protective cover has obvious moisture absorption effect, and the wearing comfort level is high.
Example 4: the five-layer symmetrical polyimide nanofiber efficient and durable air filter disc comprises a three-layer composite structure which is sequentially provided with a first strong supporting layer, a first functional supporting layer and a filtering functional layer; wherein the thickness of the filtering functional layer is 1.8 μm, and the fiber diameter is 0.08 μm; the thickness of the functional supporting layer is 8 μm, and the diameter of the functional supporting layer is 0.7 μm; the thickness of the strong support layer is 30 μm, and the diameter thereof is 2.5 μm.
The preparation method of the five-layer symmetrical polyimide nanofiber efficient and durable air filter comprises the following steps:
step one, preparation of spinning solution: uniformly mixing equimolar amounts of the component A and the component B in N, N-dimethylformamide, mechanically stirring, and reacting for 8 hours at 5 ℃ under the protection of nitrogen to obtain the spinning solution;
step two, three groups of electrostatic spinning heads are arranged on a line in sequence, and the mass concentration of the polyamic acid spinning solution in the first group is about 20%; the mass concentration of the polyamic acid spinning solution at the two ends of the second group is about 12%; the third group of heads has the mass concentration of the polyamic acid spinning solution of about 6 percent;
step three, sequentially dropping the polyamide acid superfine fibers or the nano fibers formed by electrospinning on a steel conveyer belt in three layers to form a non-woven fabric with a three-layer composite structure with different fiber diameters, introducing the non-woven fabric into a high-temperature furnace through the conveyer belt, and imidizing the non-woven fabric at 380 ℃ to form the polyimide super air filter, wherein the plane size of the filter is 160 x 220cm2. Wherein the component A is bis- (3, 4-phthalic anhydride) dimethylsilane, and the component B is 5,5 '-bis (4-aminophenoxy) -2, 2' -bipyrimidine.
The three-layer symmetrical polyimide nanofiber high-efficiency durable air filter in the embodiment is highly insulating; electrostatically charged (electrostatic voltages greater than 2000 volts); the pressure difference at 85L/min air flow rate is about 195Pa, and the interception rate of the particles with the particle size of more than 0.3 micrometer is more than 99.8%. And baking the mixture in a baking oven at 150 ℃ for 2 hours, taking out the mixture, boiling the mixture for 45min, drying the mixture, and repeating the operation for 50 times to simulate the repeated use process, wherein the interception rate of the particles with the particle size of more than 0.3 micrometer is still more than 84.0%.
Example 5: the five-layer symmetrical polyimide nanofiber efficient and durable air filter disc comprises a three-layer composite structure, namely a first function supporting layer, a filtering function layer and a second function supporting layer in sequence; wherein the preparation raw materials, the layer thickness and the fiber diameter of the first functional supporting layer and the second functional supporting layer are the same. The thickness of the filtering functional layer is 1.8 mu m, and the fiber diameter of the filtering functional layer is 0.08 mu m; the thickness of the functional support layer is 8 μm, and the diameter thereof is 0.7 μm.
The preparation method of the five-layer symmetrical polyimide nanofiber efficient and durable air filter comprises the following steps:
step one, preparation of spinning solution: uniformly mixing equimolar amounts of the component A and the component B in N, N-dimethylformamide, mechanically stirring, and reacting for 8 hours at 5 ℃ under the protection of nitrogen to obtain the spinning solution;
step two, three groups of electrostatic spinning heads are arranged on a line in sequence, and the mass concentration of the polyamic acid spinning solution at the first group of two heads is about 12%; the mass concentration of the polyamic acid spinning solution at one end of the second group is about 6%; the third group has two ends, and the mass concentration of the polyamic acid spinning solution is about 12%;
step three, sequentially dropping the polyamide acid superfine fibers or the nano fibers formed by electrospinning on a steel conveyer belt in three layers to form a non-woven fabric with a three-layer composite structure with different fiber diameters, introducing the non-woven fabric into a high-temperature furnace through the conveyer belt, and imidizing the non-woven fabric at 380 ℃ to form the polyimide super air filter, wherein the plane size of the filter is 160 x 220cm2. Wherein the component A is bis- (3, 4-phthalic anhydride) dimethylsilane, and the component B is 5,5 '-bis (4-aminophenoxy) -2, 2' -bipyrimidine.
The pressure difference of the three-layer symmetrical polyimide nanofiber efficient durable air filter in the embodiment is about 201Pa under the air flow rate of 85L/min, and the interception rate of particles with the particle size of more than 0.3 micrometer is more than 99.8%. And baking the mixture in a baking oven at 150 ℃ for 2 hours, taking out the mixture, boiling the mixture in water for 45min, drying the mixture, and repeating the operation for 50 times to simulate the repeated use process, wherein the interception rate of the particles with the particle size of more than 0.3 micrometer is about 81.5%.
Example 6: the five-layer symmetrical polyimide nanofiber efficient and durable air filter disc comprises a three-layer composite structure which is sequentially provided with a first strong supporting layer, a filtering functional layer and a second strong supporting layer; wherein the preparation raw materials, the layer thickness and the fiber diameter of the first strong supporting layer and the second strong supporting layer are the same. The thickness of the filtering functional layer is 1.8 mu m, and the fiber diameter of the filtering functional layer is 0.08 mu m; the thickness of the strong support layer is 30 μm, and the diameter thereof is 2.5 μm.
The preparation method of the five-layer symmetrical polyimide nanofiber efficient and durable air filter comprises the following steps:
step one, preparation of spinning solution: uniformly mixing equimolar amounts of the component A and the component B in N, N-dimethylformamide, mechanically stirring, and reacting for 8 hours at 5 ℃ under the protection of nitrogen to obtain the spinning solution;
step two, arranging five groups of electrostatic spinning heads on a line in sequence, wherein the mass concentration of the polyamic acid spinning solution in the first group is about 20%; the mass concentration of the polyamic acid spinning solution at one end of the second group is about 6%; a fifth group of three heads, wherein the mass concentration of the polyamic acid spinning solution is about 20%;
step three, sequentially dropping the polyamide acid superfine fibers or the nano fibers formed by electrospinning on a steel conveyer belt in three layers to form a non-woven fabric with a three-layer composite structure with different fiber diameters, introducing the non-woven fabric into a high-temperature furnace through the conveyer belt, and imidizing the non-woven fabric at 380 ℃ to form the polyimide super air filter, wherein the plane size of the filter is 160 x 220cm2. Wherein the component A is bis- (3, 4-phthalic anhydride) dimethylsilane, and the component B is 5,5 '-bis (4-aminophenoxy) -2, 2' -bipyrimidine.
The pressure difference of the three-layer symmetrical polyimide nanofiber efficient durable air filter disc in the embodiment is about 184Pa under the air flow rate of 85L/min, and the interception rate of particles with the particle size of more than 0.3 micrometer is more than 99.9%. And baking the mixture in a baking oven at 150 ℃ for 2 hours, taking out the mixture, boiling the mixture in water for 45min, drying the mixture, and repeating the operation for 50 times to simulate the repeated use process, wherein the interception rate of the particles with the particle size of more than 0.3 micrometer is about 86.0%.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in other forms, and any person skilled in the art may modify or change the technical content of the above disclosure into equivalent embodiments with equivalent changes, but all those simple modifications, equivalent changes and modifications made to the above embodiments according to the technical spirit of the present invention still belong to the protection scope of the present invention.
Claims (10)
1. A five-layer symmetrical polyimide nanofiber efficient and durable air filter disc is characterized in that the air filter disc is prepared by polyamide acid solution through electrostatic spinning; the preparation raw material of the polyamic acid solution comprises a component A and a component B; the component A is aromatic dianhydride; the component B is aromatic diamine and/or bipyrimidine diamine.
2. The five-layer symmetric polyimide nanofiber high efficiency durable air filter sheet according to claim 1, wherein the aromatic diamine is selected from one or more of diphenyl ether diamine, triphenyl diether diamine, bisphenol a type diamine, p-phenylene diamine, m-phenylene diamine, benzimidazole biphenyl diamine, 2-bis [4- (3-aminophenoxy) phenyl ] propane.
3. The five-layer symmetric polyimide nanofiber high efficiency durable air filter of claim 1, wherein the aromatic dianhydride is selected from one or more of pyromellitic dianhydride, 3 ', 4, 4' -benzophenone tetracarboxylic dianhydride, biphenyl dianhydride, diphenyl ether dianhydride, triphendiether dianhydride, bis- (3, 4-phthalic anhydride) dimethylsilane; preferably, the aromatic dianhydride is 3,3 ', 4, 4' -benzophenone tetracarboxylic dianhydride or bis- (3, 4-phthalic anhydride) dimethylsilane.
4. The five-layer symmetric polyimide nanofiber high efficiency durable air filter of claim 1, wherein the bipyrimidine diamine is 5,5 ' -bis [ P- (4-aminophenoxy) phenoxy ] bipyrimidine and/or 5,5 ' -bis (4-aminophenoxy) -2,2 ' -bipyrimidine.
5. The five-layer symmetrical polyimide nanofiber efficient and durable air filter disc as claimed in any one of claims 1 to 4, wherein the five-layer symmetrical polyimide nanofiber efficient and durable air filter disc sequentially comprises a first strong supporting layer, a first functional supporting layer, a filtering functional layer, a second functional supporting layer and a second strong supporting layer; the thickness of the filtering functional layer is 0.5-3.0 μm; the thickness of the functional supporting layer is 5-10 μm; the thickness of the strong supporting layer is 10-50 mu m.
6. The five-layer symmetrical polyimide nanofiber high-efficiency durable air filter disc as claimed in claim 5, wherein the fiber diameter of the filter function layer is 0.05-0.5 μm; the fiber diameter of the functional supporting layer is 0.5-1.0 mu m; the fiber diameter of the strong supporting layer is 1-5 mu m.
7. The preparation method of the five-layer symmetrical polyimide nanofiber efficient and durable air filter disc as claimed in any one of claims 1 to 6, wherein the preparation method comprises the following steps:
step one, preparation of spinning solution: uniformly mixing an equimolar amount of the component A and the component B in an organic solvent, mechanically stirring, and reacting for 4-12 hours at the temperature of not higher than 10 ℃ under the protection of nitrogen to obtain the spinning solution;
step two, electrostatic spinning: arranging five groups of electrostatic spinning heads on a line in sequence, extruding and electrospinning, and sequentially layering polyamide acid fibers formed by electrospinning and falling on a steel conveyor belt to form a five-layer composite structure non-woven fabric with different fiber diameters;
step three, thermal imidization: and introducing the non-woven fabric with the five-layer composite structure into a high-temperature furnace through a conveyor belt, and imidizing at 200-400 ℃ to form the five-layer symmetrical polyimide nanofiber efficient and durable air filter.
8. The preparation method of the five-layer symmetrical polyimide nanofiber high-efficiency durable air filter disc as claimed in claim 7, wherein the spinning solution comprises a filtering function layer spinning solution, and the absolute viscosity of the spinning solution is 0.6-1.4 Pa.S.
9. The preparation method of the five-layer symmetrical polyimide nanofiber high-efficiency durable air filter disc as claimed in claim 7, wherein the spinning solution comprises a functional support layer spinning solution, and the absolute viscosity of the spinning solution is 1.8-3.0 Pa.S.
10. The application of the five-layer symmetrical polyimide nanofiber high-efficiency durable air filter as claimed in any one of claims 1 to 6 in the field of medical protection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010240277.7A CN111249823A (en) | 2020-03-31 | 2020-03-31 | Five-layer symmetrical polyimide nanofiber efficient and durable air filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010240277.7A CN111249823A (en) | 2020-03-31 | 2020-03-31 | Five-layer symmetrical polyimide nanofiber efficient and durable air filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111249823A true CN111249823A (en) | 2020-06-09 |
Family
ID=70944469
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010240277.7A Pending CN111249823A (en) | 2020-03-31 | 2020-03-31 | Five-layer symmetrical polyimide nanofiber efficient and durable air filter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111249823A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113085306A (en) * | 2021-04-28 | 2021-07-09 | 广东溢达纺织有限公司 | Reusable mask filter material and preparation method thereof |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1460534A (en) * | 2003-05-28 | 2003-12-10 | 东南大学 | Nano fibre protective filtering material and its preparation method |
| CN101974828A (en) * | 2010-09-30 | 2011-02-16 | 江西先材纳米纤维科技有限公司 | Copolymerized polyimide nanofiber nonwoven and preparation method and application thereof |
| CN203425408U (en) * | 2013-08-26 | 2014-02-12 | 上海硕创生物医药科技有限公司 | Anti-bacteria dust layer structure used for gauze mask or nasal mask |
| CN204120283U (en) * | 2014-08-25 | 2015-01-28 | 宁波绿健生物科技有限公司 | The environmental protection mouth mask filter disc of a kind of effective filtration PM2.5 |
| CN105019141A (en) * | 2015-06-08 | 2015-11-04 | 江西先材纳米纤维科技有限公司 | Polyimide nanofiber flocculus, preparation method and application thereof |
| CN105231527A (en) * | 2015-11-10 | 2016-01-13 | 梧株茉 | High-function filter film and preparation method thereof and mask with multiple filter functions |
| CN105268327A (en) * | 2015-03-17 | 2016-01-27 | 青岛瑞利特新材料科技有限公司 | Graphene anti-PM2.5 mouth mask filter sheet functional layer and applications in filter sheet |
| CN105795549A (en) * | 2014-12-30 | 2016-07-27 | 天津市四维康环保科技发展有限公司 | Functional anti-haze mask for civil use |
| CN205492685U (en) * | 2016-02-03 | 2016-08-24 | 梧株茉 | Breathing mask |
| CN108164698A (en) * | 2017-11-23 | 2018-06-15 | 长沙新材料产业研究院有限公司 | The preparation method and application of polyimide precursor and polyimide nanofiber membrane |
| CN110067084A (en) * | 2019-05-21 | 2019-07-30 | 江西先材纳米纤维科技有限公司 | The preparation process and application of a kind of long yarns of superelevation branch PI electrospinning fibre |
-
2020
- 2020-03-31 CN CN202010240277.7A patent/CN111249823A/en active Pending
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1460534A (en) * | 2003-05-28 | 2003-12-10 | 东南大学 | Nano fibre protective filtering material and its preparation method |
| CN101974828A (en) * | 2010-09-30 | 2011-02-16 | 江西先材纳米纤维科技有限公司 | Copolymerized polyimide nanofiber nonwoven and preparation method and application thereof |
| CN203425408U (en) * | 2013-08-26 | 2014-02-12 | 上海硕创生物医药科技有限公司 | Anti-bacteria dust layer structure used for gauze mask or nasal mask |
| CN204120283U (en) * | 2014-08-25 | 2015-01-28 | 宁波绿健生物科技有限公司 | The environmental protection mouth mask filter disc of a kind of effective filtration PM2.5 |
| CN105795549A (en) * | 2014-12-30 | 2016-07-27 | 天津市四维康环保科技发展有限公司 | Functional anti-haze mask for civil use |
| CN105268327A (en) * | 2015-03-17 | 2016-01-27 | 青岛瑞利特新材料科技有限公司 | Graphene anti-PM2.5 mouth mask filter sheet functional layer and applications in filter sheet |
| CN105019141A (en) * | 2015-06-08 | 2015-11-04 | 江西先材纳米纤维科技有限公司 | Polyimide nanofiber flocculus, preparation method and application thereof |
| CN105231527A (en) * | 2015-11-10 | 2016-01-13 | 梧株茉 | High-function filter film and preparation method thereof and mask with multiple filter functions |
| CN205492685U (en) * | 2016-02-03 | 2016-08-24 | 梧株茉 | Breathing mask |
| CN108164698A (en) * | 2017-11-23 | 2018-06-15 | 长沙新材料产业研究院有限公司 | The preparation method and application of polyimide precursor and polyimide nanofiber membrane |
| CN110067084A (en) * | 2019-05-21 | 2019-07-30 | 江西先材纳米纤维科技有限公司 | The preparation process and application of a kind of long yarns of superelevation branch PI electrospinning fibre |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113085306A (en) * | 2021-04-28 | 2021-07-09 | 广东溢达纺织有限公司 | Reusable mask filter material and preparation method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Li et al. | Electrospun nanofibers for high-performance air filtration | |
| Guibo et al. | The electrospun polyamide 6 nanofiber membranes used as high efficiency filter materials: Filtration potential, thermal treatment, and their continuous production | |
| KR101504245B1 (en) | Polyimide blend nanofibre and its use in battery separator | |
| Dai et al. | Electrospinning polyacrylonitrile/graphene oxide/polyimide nanofibrous membranes for high-efficiency PM2. 5 filtration | |
| CN107137979B (en) | Micron fiber three-dimensional framework/polymer nanofiber composite filter material and preparation method thereof | |
| CN105821586A (en) | Nano-fiber filtering material and preparation method thereof | |
| EP3029191A1 (en) | Multi-layered nanofiber filter medium using electro-blowing, melt-blowing or electrospinning, and method for manufacturing same | |
| Wang et al. | Multilevel‐layer‐structured polyamide 6/poly (trimethylene terephthalate) nanofibrous membranes for low‐pressure air filtration | |
| CN113403707B (en) | Polyimide aerogel fiber and preparation method thereof | |
| CN105019141A (en) | Polyimide nanofiber flocculus, preparation method and application thereof | |
| TWI635891B (en) | Non-woven fabric, filter material using the same, and method for manufacturing non-woven fabric | |
| CN110195278B (en) | Preparation process and application of ultra-high-count PI-PSA electrospun fiber long yarn | |
| CN101406811B (en) | Blended fiberglass overlay film filter material | |
| CN108201735B (en) | Filter device and preparation method thereof | |
| CN106110762A (en) | The material of a kind of high efficiency filter air particle and preparation method | |
| CN111013255A (en) | Preparation method of micro/nano fiber aerogel composite filter material | |
| CN111249823A (en) | Five-layer symmetrical polyimide nanofiber efficient and durable air filter | |
| WO2012119291A1 (en) | Composite microporous filter material | |
| CN103755957B (en) | High Strength Polyimide nanofiber biaxial stretching film and its preparation method and application | |
| Li et al. | Dual-bionic nano-groove structured nanofibers for breathable and moisture-wicking protective respirators | |
| Wei et al. | Self-assembly-dominated hierarchical porous nanofibrous membranes for efficient high-temperature air filtration and unidirectional water penetration | |
| JP2009097117A (en) | Non-thermoplastic non-woven fabric, utilization of the same, and method for producing the same | |
| Akgul et al. | Nanofibrous composite air filters | |
| KR101479758B1 (en) | Polyimide nanofiber filter with excellent heat-resisting property and its method | |
| CN115608171A (en) | polyimide/MXene composite film for gas separation 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 |