CN115534454A - Nanofiber composite vehicle-mounted air filter paper with gradient structure and preparation method thereof - Google Patents

Nanofiber composite vehicle-mounted air filter paper with gradient structure and preparation method thereof Download PDF

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Publication number
CN115534454A
CN115534454A CN202211285837.6A CN202211285837A CN115534454A CN 115534454 A CN115534454 A CN 115534454A CN 202211285837 A CN202211285837 A CN 202211285837A CN 115534454 A CN115534454 A CN 115534454A
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China
Prior art keywords
filter paper
nanofiber
stirring
air filter
mounted air
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CN202211285837.6A
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Chinese (zh)
Inventor
何建新
张惠
邓书义
邵伟力
刘凡
韩鹏举
李想
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PINGYUAN FILTER CO Ltd
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PINGYUAN FILTER CO Ltd
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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
    • B32B29/00—Layered products comprising a layer of paper or cardboard
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/14—Other self-supporting filtering material ; Other filtering material
    • B01D39/16—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B29/00—Layered products comprising a layer of paper or cardboard
    • B32B29/02—Layered products comprising a layer of paper or cardboard next to a fibrous or filamentary layer
    • 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
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/06—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the heating method
    • 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
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/10—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure
    • 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
    • B32B5/265—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 characterised by one fibrous or filamentary layer being a non-woven fabric layer
    • B32B5/266—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 characterised by one fibrous or filamentary layer being a non-woven fabric layer next to one or more non-woven fabric layers
    • 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
    • D01D5/0015—Electro-spinning characterised by the initial state of the material
    • D01D5/003—Electro-spinning characterised by the initial state of the material the material being a polymer solution or dispersion
    • 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
    • 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
    • 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
    • B32B2262/0223—Vinyl resin fibres
    • B32B2262/023—Aromatic vinyl resin, e.g. styrenic (co)polymers
    • 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
    • B32B2262/0223—Vinyl resin fibres
    • B32B2262/0238—Vinyl halide, e.g. PVC, PVDC, PVF, PVDF
    • 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
    • B32B2262/0292—Polyurethane 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
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/51—Elastic
    • 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
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/536—Hardness
    • 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
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/554—Wear resistance
    • 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
    • B32B2605/00—Vehicles
    • B32B2605/08—Cars
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Dispersion Chemistry (AREA)
  • Filtering Materials (AREA)
  • Nonwoven Fabrics (AREA)

Abstract

The invention provides a nanofiber composite vehicle-mounted air filter paper with a gradient structure and a preparation method thereof, and aims to solve the technical problems of poor bonding fastness and low filtering efficiency between nanofibers and a base material in a nanofiber filter material. The invention utilizes a preparation process combining electrostatic spinning and electrostatic spraying to prepare the nanofiber composite vehicle-mounted air filter paper, which comprises an ultrafine nanofiber net layer, a nanofiber layer and a filter paper layer which are sequentially arranged. The invention is used for controlling PM under the condition of industrial standard wind speed 0.3 The initial filtering efficiency of the particles can reach 99.9 percent and reach the H12 standard of an air filtering material. More importantly, in the self-cleaning back-blowing test, after 10000 back-blowing tests, PM is treated 0.3 The filtering efficiency can still be kept above 90%. The method provides a new strategy for the high-performance nanofiber filtering material, and has important significance for the high-tech, high-quality and green sustainable development of the non-woven material and the filtering material.

Description

Nanofiber composite vehicle-mounted air filter paper with gradient structure and preparation method thereof
Technical Field
The invention belongs to the technical field of air purification, and particularly relates to nanofiber composite vehicle-mounted air filter paper with a gradient structure and a preparation method thereof.
Background
The air filter element of the automobile engine is used as an important component in an air inlet system, and can effectively filter dust or sand particles suspended in air so as to reduce the abrasion of related parts such as an air valve, an air cylinder, a piston and the like, avoid serious phenomena of cylinder pulling and cylinder explosion, enable the engine to work under normal working conditions and further improve the total service time of the engine. When the engine works normally, air firstly enters the air inlet manifold after being filtered by the filter element, then sequentially passes through the throttle valve and the air inlet pressure stabilizing box and finally is gathered into the cylinder of the engine. Under the condition that no air filter element is installed, unfiltered air can not be normally combusted when being contacted with automobile fuel, carbon deposition is easily generated in an engine cylinder, the condition of incapability of accelerating in the running process of a vehicle can be caused when the carbon deposition is serious, and the tail gas emission is influenced. In addition, due to the use of the air filter element of the engine, the air intake resistance of the engine is increased, which not only affects the power output of the engine, but also affects the economic performance of the engine. Therefore, the air filter element can prolong the service life of the engine and ensure the stable output of power.
In the traditional electrostatic spinning process, the diameter of the prepared nanofiber is 100-300nm, the prepared nanofiber membrane still has the mechanical properties and chemical properties of the original raw materials, but the fiber diameter is thick and the pore diameter is large, so that the interception performance of particles with various dimensions in the air is low, and the application of high-performance nanofiber in an air filter material is limited.
The electrostatic spraying technique differs from the traditional electrospinning process technique in that the polymer solution is formed into a pendant conical droplet at the tip of the spray head by the action of a high voltage electrostatic field, known by researchers as taylor cones. When the charge repulsion on the surface of the drop exceeds its surface tension, the pendant drop begins to break apart to form numerous small droplets, referred to as "sprays"; the droplets are subjected to stretching action of electric field force, solvent volatilization, solidification and a self-assembly forming mechanism in the process of flying at high speed in the electric field, and finally deposited on a grounded receiving device to form the polymer reticular fibers. The diameters of which are generally distributed between 10 and 30 nm. The superfine nanometer fiber net formed by electrostatic spraying has the characteristics of small pore diameter and high porosity, but also has the characteristic of low strength.
In addition, most researchers at present aim at the modification of the nano fiber, and the bonding fastness between the nano fiber and the substrate is rarely studied. In practical applications and tests, the fastness between the nanofiber and the substrate can seriously affect the filtration performance. Especially in a self-cleaning back-blowing test (one of air filtering material industry standard tests), the poor adhesion fastness can greatly reduce the filtering performance of the nanofiber filtering material, and the nanofiber filtering material cannot be reused, so that the practical application of the nanofibers is greatly limited.
Disclosure of Invention
The invention provides a nanofiber composite vehicle-mounted air filter paper with a gradient structure and a preparation method thereof, aiming at the technical problems of poor bonding fastness and low filtering efficiency between nanofibers and a base material in a nanofiber filter material.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a preparation method of nanofiber composite vehicle-mounted air filter paper with a gradient structure comprises the following steps:
(1) Sequentially stirring and dissolving a polymer I, an adhesive and a curing agent into a solvent I to prepare a nanofiber spinning solution;
(2) Sequentially stirring and dissolving triethylamine salt, a polymer II, an adhesive and a curing agent into a solvent II to prepare a superfine nano fiber spinning solution;
(3) Spinning the nanofiber spinning solution prepared in the step (1) by using an electrostatic spinning technology, taking a receiving substrate as filter paper, and spraying a layer of nanofiber to prepare nanofiber membrane filter paper;
(4) Spinning the superfine nano fiber spinning solution prepared in the step (2) by using an electrostatic spray technology, receiving the nano fiber membrane filter paper prepared in the step (3) as a substrate, and spraying a layer of superfine nano fiber net to prepare multilayer composite filter paper
(5) And (4) bonding the layers in the multilayer composite filter paper prepared in the step (4) together through a hot-pressing composite process to prepare the nanofiber composite vehicle-mounted air filter paper.
Preferably, the polymer I is dried in advance at a temperature of 50-75 ℃ for at least 2 hours.
Preferably, the polymer II needs to be dried in advance, the drying temperature is 50-75 ℃, and the drying time is at least 2 hours.
In the step (1), the mass ratio of the adhesive to the polymer I is 1: (2-5), wherein the mass ratio of the curing agent to the polymer I is 1: (10-100), wherein the mass ratio of the solvent I to the polymer I is (12-25): 1.
in the step (2), the mass ratio of triethylamine salt to polymer II is 1: (5-8), wherein the mass ratio of the adhesive to the polymer II is 1: (2-5), wherein the mass ratio of the curing agent to the polymer II is 1: (10-100), wherein the mass ratio of the solvent II to the polymer II is (12-25): 1.
the polymer I is polystyrene or polyacrylonitrile; the solvent I is N, N-dimethylacetamide or N, N-dimethylformamide; the polymer II is polyvinylidene fluoride or polyurethane; the solvent II is N, N-dimethylacetamide or N, N-dimethylformamide; in the step (1) or (2), the adhesive is ethyl acrylate, and the curing agent is polyether amine; the triethylamine salt is one or the combination of more than two of triethylamine hydrochloride, triethylamine sulfate or triethylamine nitrate; preferably, the triethylamine salt is triethylamine hydrochloride.
Preferably, the curing agent in the step (1) or (2) is polyether ZT-143 curing agent.
The dissolving conditions of the components in the step (1) are as follows: the stirring and dissolving temperature of the polymer I is 60-70 ℃; the stirring and dissolving temperature of the adhesive is 40-55 ℃; the stirring and dissolving temperature of the curing agent is 20-25 ℃, and the stirring time is 10-30min.
The dissolving conditions of the components in the step (2) are as follows: the stirring and dissolving temperature of the triethylamine salt is 60-70 ℃; the stirring and dissolving temperature of the polymer II is 80-120 ℃; the stirring and dissolving temperature of the adhesive is 40-55 ℃; the stirring and dissolving temperature of the curing agent is 20-25 ℃, and the stirring time is 10-30min.
Preferably, the stirring, dissolving and stirring time of the adhesive in the step (1) or the step (2) is 2-4h.
The parameters of the electrostatic spinning technology in the step (3) are as follows: the spinning voltage of the high-voltage generator is 10-80KV, the distance from the nozzle to the receiving base cloth is 15-20cm, the caliber of the nozzle is 0.15-0.3cm, and the flow rate of the sprayed electrostatic spinning solution is 0.5-1.5mL/h.
By controlling the receiving time of the electrostatic spinning, the thickness of the nanofiber membrane can be regulated and controlled, and the receiving time can be controlled according to actual needs. Preferably, the receiving time is 5-30min.
The filter paper in the step (3) is cellulose filter paper; preferably, the cellulose filter paper has a pore size distribution of 75-100 μm and a gram weight of 50-300g/m 3 。
The parameters of the electrostatic spraying technology in the step (4) are as follows: the voltage of the high-voltage generator is 40-80KV, the distance from the spray nozzle to the receiving base cloth is 18-25cm, the caliber of the spray nozzle is 0.05-0.2cm, the flow rate of the sprayed electrostatic spinning solution is 0.2-1.0mL/h, and the receiving time is 5-30min.
In the hot-pressing compounding process in the step (5), the hot-pressing temperature is 60-130 ℃, the pressure is 0.5-2MPa, and the hot-pressing rotating speed is 50-300r/min.
The nanofiber composite vehicle-mounted air filter paper prepared by the method comprises an ultrafine nanofiber web, a nanofiber membrane and filter paper which are sequentially arranged, wherein the average diameter of fibers in the ultrafine nanofiber web is 20-35nm, and the average diameter of fibers in the nanofibers is 200-300nm. Preferably, the porosity of the vehicle air filter paper is 0.25-0.85cm 3 /g
The invention has the beneficial effects that: the prepared nanofiber composite vehicle-mounted air filter paper has a gradient structure, the fiber diameter is distributed about 20-300nm, and the nanofiber composite vehicle-mounted air filter paper has the advantages of being fine in diameter, small in pore size, high in strength, good in filtering effect and the like. Nano-fiber composite vehicle-mounted air filter paper for PM (particulate matter) under the condition of industrial standard wind speed (5.33 cm/s) 0.3 The initial filtering efficiency of the particles can reach 99.9 percent and reach the H12 standard of an air filtering material. More importantly, compared with the common nano-fiber filter material (the filtration efficiency is reduced by more than 50%) in the self-cleaning back-blowing test, the invention filters PM0.3 after 10000 back-blowing testThe efficiency can still be kept above 90%, and the strong composite strength and the high filtering efficiency among all layers of the composite filter paper are shown.
The prepared nanofiber membrane with the gradient structure is coated on the cellulose filter paper and is bonded through hot pressing, the vehicle-mounted air filter paper has the characteristics of oil resistance, wear resistance, high hardness, good elasticity, low resistance, high efficiency, high filtering precision, long service life and the like by means of the good mechanical property of the cellulose filter paper and the high surface energy of the nanofiber, and by means of the combination of electrostatic spinning and electrostatic spraying, the vehicle-mounted air filter paper has the advantages of energy conservation, simple process flow, convenience in operation and mass production, and provides convenient conditions for effectively improving the air inlet quality of an engine and improving the fuel efficiency.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is an electron microscope picture of the nanofiber composite vehicle-mounted air filter paper with a gradient structure.
Fig. 2 is a real image of the nanofiber composite vehicle-mounted air filter paper with a gradient structure.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.
Example 1
A preparation method of nanofiber composite vehicle-mounted air filter paper with a gradient structure comprises the following steps:
1) PS with a mass of 1.2g is poured into different beakers and placed in an oven at a temperature of 75 ℃ for 2 hours. 18g of (N, N-dimethylacetamide) DMAc were weighed out into a bottle containing the corresponding PS and stirred with a magnetic stirrer. The stirring temperature is 60 ℃, the rotating speed is 500r/min, and the stirring time is 4h.
2) Adding 0.4g of ethyl acrylate adhesive into the solution obtained in the step 1), placing the solution into a magnetic stirrer, and stirring for 2 hours at the stirring temperature of 55 ℃ and the stirring speed of 350 r/min.
3) And (3) placing the reaction product obtained in the step 2) at room temperature, adding 0.02g of polyether ZT-143 curing agent, placing the mixture into a magnetic stirrer, and stirring for 30min at the stirring temperature of 25 ℃ and the stirring speed of 50 r/min.
4) PVDF (polyvinylidene fluoride) with the mass of 0.8g is poured into different beakers and placed in an oven at the temperature of 75 ℃ for 2 hours.
5) 0.1g of triethylamine hydrochloride crystals were weighed into a clean glass bottle, and 18g of (N, N-dimethylacetamide) DMAc was weighed into the corresponding bottle and stirred with a magnetic stirrer. In order to ensure that the triethylamine hydrochloride crystals are fully dissolved, the stirring temperature is 70 ℃, the rotating speed is 500r/min, and the stirring time is 4 hours.
6) And then adding the raw material obtained in the step 4) into the triethylamine hydrochloride/DMAc solution obtained in the step 5), placing the mixture into a magnetic stirrer to stir, wherein the stirring temperature is 80 ℃, the stirring speed is 300r/min, and the stirring time is 8h.
7) Adding 0.4g of ethyl acrylate adhesive into the solution obtained in the step 6), placing the solution into a magnetic stirrer for stirring, wherein the stirring temperature is 40 ℃, the stirring speed is 200r/min, and the stirring time is 2h.
8) And (3) placing the reaction product obtained in the step 7) at room temperature, adding 0.01g of polyether ZT-143 curing agent, placing the mixture in a magnetic stirrer, and stirring the mixture at the stirring temperature of 20 ℃ and the stirring speed of 50r/min for 10min.
9) Spinning the solution obtained in the step 3) by utilizing an electrostatic spinning technology, and spraying PS nano-fibers on the cellulose filter paper in random arrangement. The irregular cellulose filter paper is made by taking wood pulp as a raw material through a paper making technology, and the pore size distribution is 75 mu m. When the electrostatic spinning device works, the voltage of the high-voltage generator is 50KV; the distance from the nozzle to the receiving base cloth is 20cm; the caliber of the nozzle is 0.15cm; the flow rate of the sprayed electrostatic spinning solution is 1.5mL/h; the receiving time is 30min.
10 ) spinning the solution obtained in the step 8) by using an electrostatic spraying technology, and spraying the superfine PVDF nano-fiber net on the filter paper prepared in the step 9). When the electrostatic spraying device works, the voltage of the high-voltage generator is 80KV; the distance from the spray nozzle to the receiving base cloth is 20cm; the caliber of the spray nozzle is 0.2cm; the flow rate of the sprayed electrostatic spinning solution is 0.5mL/h; and receiving for 5min to obtain the multilayer composite filter paper.
11 And) carrying out hot-pressing compounding on the multilayer composite filter paper obtained in the step 10) to tightly adhere the multilayer composite filter paper together, wherein the hot-pressing temperature in the hot-pressing compounding is 80 ℃, the hot-pressing pressure is 1MPa, and the hot-pressing rotating speed is 300r/min, so that the nanofiber composite vehicle-mounted air filter paper is prepared, as shown in figure 2.
As can be seen from FIG. 1, the diameter of the obtained PS nanofibers was 280nm, the average diameter of the PVDF ultrafine nanofiber web was 30nm, and the porosity of the nanofiber composite vehicle-mounted air filter paper was 0.68cm 3 (ii) in terms of/g. And then carrying out the passing performance on the prepared nanofiber composite vehicle-mounted air filter paper by adopting a TSI8130A filter material testing system, wherein the filter medium is NaCl aerosol with the particle size of 0.3 mu m, the air flow is 32L/min, and the air speed is 5.33cm/s. Through testing, the nano-fiber composite vehicle-mounted air filter paper is used for PM 0.3 The initial filtering efficiency of the particles can reach 99.9 percent and reach the H12 standard of an air filtering material. In the self-cleaning back-blowing test, after 10000 back-blowing tests, PM is treated 0.3 The filtration efficiency was 91%.
Example 2
A preparation method of nanofiber composite vehicle-mounted air filter paper with a gradient structure comprises the following steps:
1) PAN with the mass of 0.9g is poured into different beakers and placed in an oven at the temperature of 50 ℃ for 2 hours. 18.8g of (N, N-dimethylacetamide) DMAc were weighed into a bottle containing the corresponding PAN and stirred with a magnetic stirrer. The stirring temperature is 60 ℃, the rotating speed is 500r/min, and the stirring time is 4h.
2) Adding 0.4g of ethyl acrylate adhesive into the solution obtained in the step 1), placing the mixture into a magnetic stirrer for stirring, wherein the stirring temperature is 55 ℃, the stirring speed is 2000r/min, and the stirring time is 4 hours.
3) And (3) placing the reaction product obtained in the step 2) at room temperature, adding 0.02g of polyether ZT-143 curing agent, placing the mixture in a magnetic stirrer, and stirring the mixture for 20min at the stirring temperature of 20 ℃ at the stirring speed of 100 r/min.
4) PU with the mass of 0.9g is poured into different beakers and placed in an oven at the temperature of 60 ℃ for 2 hours.
5) 0.15g of triethylamine hydrochloride crystals were weighed into a clean glass bottle, and 18.8g of (N, N-dimethylacetamide) DMAc was weighed into the corresponding bottle and stirred with a magnetic stirrer. In order to ensure that the triethylamine hydrochloride crystals are fully dissolved, the stirring temperature is 70 ℃, the rotating speed is 600r/min, and the stirring time is 4 hours.
6) Then adding the raw material obtained in the step 4) into the obtained triethylamine hydrochloride/DMAc solution, placing the solution into a magnetic stirrer for stirring, wherein the stirring temperature is 90 ℃, the stirring speed is 400r/min, and the stirring time is 9 hours.
7) Adding 0.3g of ethyl acrylate adhesive into the solution obtained in the step 6), placing the solution into a magnetic stirrer, and stirring the solution at the stirring temperature of 55 ℃ at the stirring speed of 250r/min for 4 hours.
8) And (3) placing the reaction product obtained in the step 7) at room temperature, adding 0.05g of polyether ZT-143 curing agent, placing the mixture into a magnetic stirrer, and stirring for 10min at the stirring temperature of 25 ℃ and the stirring speed of 100 r/min.
9) Spinning the solution obtained in the step 3) by utilizing an electrostatic spinning technology, and spraying the PAN nano-fibers on the cellulose filter paper in random arrangement. The irregular cellulose filter paper is made from wood pulp by a papermaking technology, and the aperture is 75 μm. When the electrostatic spinning device works, the voltage of the high-voltage generator is 60KV; the distance from the nozzle to the receiving base cloth is 16cm; the caliber of the nozzle is 0.2cm; the flow rate of the sprayed electrostatic spinning solution is 0.6mL/h; the receiving time is 10min.
10 Spinning the solution obtained in the step 8) by using an electrostatic spraying technology, and spraying the superfine PU nano fiber net on the filter paper prepared in the step 9). When the electrostatic spraying device works, the voltage of the high-voltage generator is 50KV; the distance from the spray nozzle to the receiving base cloth is 18cm; the caliber of the spray nozzle is 0.2cm; the flow rate of the sprayed electrostatic spinning solution is 0.8mL/h; and (5) receiving for 15min to prepare the multilayer composite filter paper.
11 Carrying out hot-pressing compounding on the multilayer composite filter paper obtained in the step 10) to tightly adhere the multilayer composite filter paper together, wherein the hot-pressing temperature is 80 ℃, the hot-pressing pressure is 0.5MPa, and the hot-pressing rotating speed is 100r/min, so as to obtain the nanofiber composite vehicle-mounted air filter paper.
Tests show that the average diameter of the obtained PAN nanofiber is 202nm, the average diameter of the PU superfine nanofiber net is 21nm, and the porosity of the nanofiber composite vehicle-mounted air filter paper is 0.52cm 3 /g。
Example 3
A preparation method of nanofiber composite vehicle-mounted air filter paper with a gradient structure comprises the following steps:
1) PS with the mass of 0.9g is poured into different beakers and placed in an oven at the temperature of 60 ℃ for 2 hours. 18.8g of (N, N-dimethylacetamide) DMAc were weighed into a bottle containing the corresponding PS and stirred with a magnetic stirrer. The stirring temperature is 70 ℃, the rotating speed is 500r/min, and the stirring time is 4h.
2) Adding 0.4g of ethyl acrylate adhesive into the solution obtained in the step 1), placing the mixture into a magnetic stirrer, and stirring the mixture for 4 hours at the stirring temperature of 50 ℃ and the stirring speed of 300r/min.
3) And (3) placing the reaction product obtained in the step 2) at room temperature, adding 0.05g of polyether ZT-143 curing agent, placing the mixture in a magnetic stirrer, and stirring the mixture at the stirring temperature of 22 ℃ and the stirring speed of 60r/min for 10min.
4) PVDF (polyvinylidene fluoride) with the mass of 0.9g is poured into different beakers and placed in an oven at the temperature of 55 ℃ for 2 hours.
5) 0.25g of triethylamine hydrochloride crystals were weighed into a clean glass bottle, and 18.8g of (N, N-dimethylacetamide) DMAc was weighed into the corresponding bottle and stirred with a magnetic stirrer. In order to ensure that the triethylamine hydrochloride crystals are fully dissolved, the stirring temperature is 70 ℃, the rotating speed is 500r/min, and the stirring time is 4 hours.
6) Then adding the raw material obtained in the step 4) into the obtained triethylamine hydrochloride/DMAc solution, placing the solution into a magnetic stirrer for stirring, wherein the stirring temperature is 100 ℃, the stirring speed is 400r/min, and the stirring time is 10 hours.
7) Adding 0.4g of ethyl acrylate adhesive into the solution obtained in the step 6), placing the mixture into a magnetic stirrer for stirring, wherein the stirring temperature is 55 ℃, the stirring speed is 300r/min, and the stirring time is 4 hours.
8) And (3) placing the reaction product obtained in the step 7) at room temperature, adding 0.02g of polyether ZT-143 curing agent, placing the mixture into a magnetic stirrer, and stirring for 10min at the stirring temperature of 20 ℃ and the stirring speed of 100 r/min.
9) Spinning the solution obtained in the step 3) by utilizing an electrostatic spinning technology, and spraying PS nano-fibers on the cellulose filter paper in random arrangement. The irregular cellulose filter paper is made from wood pulp by a papermaking technology, and the pore size distribution is 100 mu m. When the electrostatic spinning device works, the voltage of the high-voltage generator is 50KV; the distance from the nozzle to the receiving base cloth is 16cm; the caliber of the nozzle is 0.3cm; the flow rate of the sprayed electrostatic spinning solution is 0.8mL/h; the receiving time is 10min.
10 Spinning the solution obtained in the step 8) by utilizing an electrostatic spraying technology, and spraying the superfine PVDF nanofiber net on the nanofiber layer prepared in the step 9). When the electrostatic spraying device works, the voltage of the high-voltage generator is 60KV; the distance from the spray nozzle to the receiving base cloth is 16cm; the caliber of the spray nozzle is 0.1cm; the flow rate of the sprayed electrostatic spinning solution is 0.5mL/h; receiving for 10min to obtain the multilayer composite filter paper.
11 The multi-layer composite filter paper obtained in the step 10) is tightly bonded together through hot-press compounding. The hot pressing temperature is 70 ℃, the hot pressing pressure is 2MPa, and the hot pressing rotating speed is 100r/min, so that the nanofiber composite vehicle-mounted air filter paper is prepared.
Tests show that the diameters of the obtained PS nano-fibers are 200-300nm, the diameters of the PVDF superfine nano-fiber nets are respectively 20-35nm, and the porosity of the nano-fiber composite vehicle-mounted air filter paper is 0.61cm 3 /g。
Example 4
A preparation method of nanofiber composite vehicle-mounted air filter paper with a gradient structure comprises the following steps:
1) PS with the mass of 0.9g is poured into different beakers and placed in an oven at the temperature of 60 ℃ for 3 hours. 18.8g of (N, N-dimethylacetamide) DMAc were weighed into a bottle containing the corresponding PS and stirred with a magnetic stirrer. The stirring temperature is 70 ℃, the rotating speed is 500r/min, and the stirring time is 4h.
2) Adding 0.3g of ethyl acrylate adhesive into the solution obtained in the step 1), placing the mixture into a magnetic stirrer, and stirring the mixture for 4 hours at the stirring temperature of 45 ℃ and the stirring speed of 350 r/min.
3) And (3) placing the reaction product obtained in the step 2) at room temperature, adding 0.03g of polyether ZT-143 curing agent, placing the mixture in a magnetic stirrer, and stirring the mixture at the stirring temperature of 20 ℃ and the stirring speed of 40r/min for 10min.
4) PU with the mass of 0.9g is poured into different beakers and placed in an oven at the temperature of 75 ℃ for 2 hours.
5) 0.2g of triethylamine hydrochloride crystals were weighed into a clean glass bottle, and 19.2g of (N, N-dimethylacetamide) DMAc was weighed into the corresponding bottle and stirred with a magnetic stirrer. In order to ensure that the triethylamine hydrochloride crystals are fully dissolved, the stirring temperature is 60 ℃, the rotating speed is 600r/min, and the stirring time is 4 hours.
6) Then adding the raw material obtained in the step 4) into the obtained triethylamine hydrochloride/DMAc solution, placing the solution into a magnetic stirrer for stirring, wherein the stirring temperature is 80 ℃, the stirring speed is 500r/min, and the stirring time is 10 hours.
7) Adding 0.3g of ethyl acrylate adhesive into the solution obtained in the step 6), placing the solution into a magnetic stirrer, and stirring for 4 hours at the stirring temperature of 45 ℃ and the stirring speed of 200 r/min.
8) And (3) placing the reaction product obtained in the step 7) at room temperature, adding 0.01g of polyether ZT-143 curing agent, placing the mixture in a magnetic stirrer, and stirring the mixture at the stirring temperature of 20 ℃ and the stirring speed of 50r/min for 10min.
9) Spraying PS nano-fibers on the cellulose filter paper in random arrangement by utilizing the electrostatic spinning technology to the reaction product obtained in the step 3). The irregular cellulose filter paper is made by taking wood pulp as a raw material through a paper making technology, and the pore size distribution is 75 mu m. When the electrostatic spinning device works, the voltage of the high-voltage generator is 40KV; the distance from the nozzle to the receiving base cloth is 16cm; the caliber of the nozzle is 0.5cm; the flow rate of the sprayed electrostatic spinning solution is 0.8mL/h; the receiving time is 10min.
10 Spraying the reaction product obtained in the step 8) on the filter paper containing the irregularly arranged cellulose in the step 9) by using an electrostatic spraying technology. When the electrostatic spraying device works, the voltage of the high-voltage generator is 60KV; the distance from the spray nozzle to the receiving base cloth is 20cm; the caliber of the spray nozzle is 0.2cm; the flow rate of the sprayed electrostatic spinning solution is 0.5mL/h; and receiving for 15min to obtain the multilayer composite filter paper.
11 Carrying out hot-pressing compounding on the multilayer composite filter paper obtained in the step 10) to tightly adhere the multilayer composite filter paper together, wherein the hot-pressing temperature is 60 ℃, the hot-pressing pressure is 1MPa, and the hot-pressing rotating speed is 50r/min, so as to obtain the nanofiber composite vehicle-mounted air filter paper.
Tests show that the diameters of the obtained PS nanofibers are 200-300nm, the diameters of the PU superfine nanofiber nets are respectively 20-35nm, and the porosity of the nanofiber composite vehicle-mounted air filter paper is 0.71cm 3 /g。
Example 5
A preparation method of nanofiber composite vehicle-mounted air filter paper with a gradient structure comprises the following steps:
1) PAN with the mass of 1g is poured into different beakers and placed in an oven at the temperature of 50 ℃ for 5 hours. 25g of (N, N-dimethylformamide) DMF are then weighed into a bottle containing the corresponding PAN and stirred with a magnetic stirrer. The stirring temperature is 65 ℃, the rotating speed is 500r/min, and the stirring time is 4h.
2) Adding 0.2g of ethyl acrylate adhesive into the solution obtained in the step 1), placing the mixture into a magnetic stirrer for stirring, wherein the stirring temperature is 40 ℃, the stirring speed is 2000r/min, and the stirring time is 2 hours.
3) And (3) placing the reaction product obtained in the step 2) at room temperature, adding 0.01g of polyether ZT-143 curing agent, placing the mixture in a magnetic stirrer, and stirring the mixture for 20min at the stirring temperature of 23 ℃ and the stirring speed of 100 r/min.
4) PU with the mass of 1g is poured into different beakers and placed in an oven at the temperature of 60 ℃ for 4 hours.
5) 0.2g of triethylamine sulfate crystals are weighed into a clean glass bottle, and 25g of (N, N-dimethylacetamide) DMAc are weighed into the corresponding bottle and stirred with a magnetic stirrer. In order to ensure that the triethylamine hydrochloride crystals are fully dissolved, the stirring temperature is 65 ℃, the rotating speed is 600r/min, and the stirring time is 4h.
6) Then adding the raw material obtained in the step 4) into the obtained triethylamine hydrochloride/DMAc solution, placing the solution into a magnetic stirrer to be stirred, wherein the stirring temperature is 120 ℃, the stirring speed is 400r/min, and the stirring time is 6h.
7) Adding 0.2g of ethyl acrylate adhesive into the solution obtained in the step 6), placing the solution into a magnetic stirrer, and stirring the solution at the stirring temperature of 45 ℃ at the stirring speed of 250r/min for 3h.
8) And (3) placing the reaction product obtained in the step 7) at room temperature, adding 0.01g of polyether ZT-143 curing agent, placing the mixture in a magnetic stirrer, and stirring the mixture at the stirring temperature of 25 ℃ and the stirring speed of 100r/min for 30min.
9) Spinning the solution obtained in the step 3) by utilizing an electrostatic spinning technology, and spraying PAN (Polyacrylonitrile) nano fibers on the irregularly arranged cellulose filter paper. The irregular cellulose filter paper is made from wood pulp as a raw material by a paper making technology, and the aperture is 75 mu m. When the electrostatic spinning device works, the voltage of the high-voltage generator is 10KV; the distance from the nozzle to the receiving base cloth is 15cm; the caliber of the nozzle is 0.15cm; the flow rate of the sprayed electrostatic spinning solution is 0.5mL/h; the receiving time is 30min.
10 Spinning the solution obtained in the step 8) by using an electrostatic spraying technology, and spraying the superfine PU nano fiber net on the filter paper prepared in the step 9). When the electrostatic spraying device works, the voltage of the high-voltage generator is 40KV; the distance from the spray nozzle to the receiving base cloth is 25cm; the caliber of the spray nozzle is 0.05cm; the flow rate of the sprayed electrostatic spinning solution is 0.1mL/h; receiving for 20min to obtain the multilayer composite filter paper.
11 Carrying out hot-pressing compounding on the multilayer composite filter paper obtained in the step 10) to tightly adhere the multilayer composite filter paper together, wherein the hot-pressing temperature is 130 ℃, the hot-pressing pressure is 0.1MPa, and the hot-pressing rotating speed is 50r/min, so as to obtain the nanofiber composite vehicle-mounted air filter paper.
Tests show that the average diameter of the obtained PAN nano-fiber is 290nm, the average diameter of the PU superfine nano-fiber net is 34nm, and the porosity of the nano-fiber composite vehicle-mounted air filter paper is 0.26cm 3 /g。
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (10)

1. A preparation method of nanofiber composite vehicle-mounted air filter paper with a gradient structure is characterized by comprising the following steps:
(1) Sequentially stirring and dissolving a polymer I, an adhesive and a curing agent into a solvent I to prepare a nanofiber spinning solution;
(2) Sequentially stirring and dissolving triethylamine salt, a polymer II, an adhesive and a curing agent into a solvent II to prepare an ultrafine nanofiber spinning solution;
(3) Spinning the nanofiber spinning solution prepared in the step (1) by using an electrostatic spinning technology, and spraying a layer of nanofiber membrane on filter paper to prepare nanofiber membrane filter paper;
(4) Spinning the superfine nano-fiber spinning solution prepared in the step (2) by using an electrostatic spraying technology, spraying a layer of superfine nano-fiber net on the nano-fiber membrane filter paper prepared in the step (3) to prepare the multi-layer composite filter paper
(5) And (4) bonding the layers in the multilayer composite filter paper prepared in the step (4) together through a hot-pressing composite process to prepare the nanofiber composite vehicle-mounted air filter paper.
2. The preparation method of the nanofiber composite vehicle-mounted air filter paper with the gradient structure as claimed in claim 1, is characterized in that: in the step (1), the mass ratio of the adhesive to the polymer I is 1: (2-5), wherein the mass ratio of the curing agent to the polymer I is 1: (10-100), wherein the mass ratio of the solvent I to the polymer I is (12-25): 1.
3. the preparation method of the nanofiber composite vehicle-mounted air filter paper with the gradient structure as claimed in claim 2, is characterized in that: in the step (2), the mass ratio of the triethylamine salt to the polymer II is 1: (5-8), wherein the mass ratio of the adhesive to the polymer II is 1: (2-5), wherein the mass ratio of the curing agent to the polymer II is 1: (10-100), wherein the mass ratio of the solvent II to the polymer II is (12-25): 1.
4. the preparation method of the nanofiber composite vehicle-mounted air filter paper with the gradient structure as claimed in claim 3, is characterized in that: the polymer I is polystyrene or polyacrylonitrile; the solvent I is N, N-dimethylacetamide or N, N-dimethylformamide; the polymer II is polyvinylidene fluoride or polyurethane; the solvent II is N, N-dimethylacetamide or N, N-dimethylformamide; in the step (1) or (2), the adhesive is ethyl acrylate, and the curing agent is polyether amine; the triethylamine salt is one or the combination of more than two of triethylamine hydrochloride, triethylamine sulfate or triethylamine nitrate.
5. The preparation method of nanofiber composite vehicle-mounted air filter paper with a gradient structure as claimed in claim 4, wherein the stirring and dissolving conditions of the components in the step (1) are as follows: the stirring and dissolving temperature of the polymer I is 60-70 ℃; the stirring and dissolving temperature of the adhesive is 40-55 ℃; the stirring and dissolving temperature of the curing agent is 20-25 ℃, and the stirring time is 10-30min.
6. The preparation method of nanofiber composite vehicle-mounted air filter paper with gradient structure as claimed in claim 4, wherein the stirring and dissolving conditions of each component in the step (2) are as follows: the stirring and dissolving temperature of the triethylamine salt is 60-70 ℃; the stirring and dissolving temperature of the polymer II is 80-120 ℃; the stirring and dissolving temperature of the adhesive is 40-55 ℃; the stirring and dissolving temperature of the curing agent is 20-25 ℃, and the stirring time is 10-30min.
7. The preparation method of nanofiber composite vehicle-mounted air filter paper with a gradient structure as claimed in claim 6, wherein the parameters of the electrospinning technology in the step (3) are as follows: the spinning voltage of the high-voltage generator is 10-80KV, the distance from the nozzle to the receiving base cloth is 15-20cm, the caliber of the nozzle is 0.15-0.3cm, the flow rate of the sprayed electrostatic spinning solution is 0.5-1.5mL/h, and the receiving time is 5-30min; the filter paper is cellulose filter paper.
8. The preparation method of the nanofiber composite vehicle-mounted air filter paper with the gradient structure as claimed in claim 7, wherein the parameters of the electrostatic spraying technology in the step (4) are as follows: the voltage of the high-voltage generator is 40-80KV, the distance from the spray nozzle to the receiving base cloth is 18-25cm, the caliber of the spray nozzle is 0.05-0.2cm, the flow rate of the sprayed electrostatic spinning solution is 0.2-1.0mL/h, and the receiving time is 5-30min.
9. The preparation method of the nanofiber composite vehicle-mounted air filter paper with the gradient structure as claimed in claim 8, is characterized in that: in the hot-pressing compounding process in the step (5), the hot-pressing temperature is 60-130 ℃, the hot-pressing pressure is 0.5-2MPa, and the hot-pressing rotating speed is 50-300r/min.
10. The nanofiber composite vehicle-mounted air filter paper with a gradient structure prepared by the method of any one of claims 1 to 9, which comprises an ultrafine nanofiber web, a nanofiber membrane and the filter paper, wherein the ultrafine nanofiber web, the nanofiber membrane and the filter paper are sequentially arranged, the average diameter of fibers in the ultrafine nanofiber web is 20-35nm, and the average diameter of fibers in the nanofiber membrane is 200-300nm.
CN202211285837.6A 2022-06-07 2022-10-20 Nanofiber composite vehicle-mounted air filter paper with gradient structure and preparation method thereof Pending CN115534454A (en)

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CN105233568A (en) * 2015-09-29 2016-01-13 东华大学 Static spinning method and nano fiber/glass fiber composite filter material prepared by same
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Publication number Priority date Publication date Assignee Title
CN105233568A (en) * 2015-09-29 2016-01-13 东华大学 Static spinning method and nano fiber/glass fiber composite filter material prepared by same
CN111013407A (en) * 2019-12-31 2020-04-17 杭州帝凡过滤技术有限公司 Multi-stage filtration hydrophilic nanofiber membrane and manufacturing method thereof

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