CN116550049A - Corrugated structure air filtering material and preparation method thereof - Google Patents
Corrugated structure air filtering material and preparation method thereof Download PDFInfo
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- CN116550049A CN116550049A CN202310386024.4A CN202310386024A CN116550049A CN 116550049 A CN116550049 A CN 116550049A CN 202310386024 A CN202310386024 A CN 202310386024A CN 116550049 A CN116550049 A CN 116550049A
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- 239000003658 microfiber Substances 0.000 claims abstract description 51
- 239000002121 nanofiber Substances 0.000 claims abstract description 51
- 239000000835 fiber Substances 0.000 claims abstract description 46
- 229920000098 polyolefin Polymers 0.000 claims abstract description 21
- 238000000034 method Methods 0.000 claims abstract description 20
- 238000009987 spinning Methods 0.000 claims description 28
- 238000010041 electrostatic spinning Methods 0.000 claims description 22
- 239000002131 composite material Substances 0.000 claims description 21
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- 239000003063 flame retardant Substances 0.000 description 1
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Classifications
-
- 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
-
- 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
- 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
- B01D39/1607—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being fibrous
- B01D39/1623—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being fibrous of synthetic origin
-
- 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
- B01D39/18—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being cellulose or derivatives thereof
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
- B01D2239/02—Types of fibres, filaments or particles, self-supporting or supported materials
- B01D2239/025—Types of fibres, filaments or particles, self-supporting or supported materials comprising nanofibres
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
- B01D2239/06—Filter cloth, e.g. knitted, woven non-woven; self-supported material
- B01D2239/0604—Arrangement of the fibres in the filtering material
- B01D2239/0618—Non-woven
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
- B01D2239/06—Filter cloth, e.g. knitted, woven non-woven; self-supported material
- B01D2239/0604—Arrangement of the fibres in the filtering material
- B01D2239/0631—Electro-spun
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
- B01D2239/06—Filter cloth, e.g. knitted, woven non-woven; self-supported material
- B01D2239/065—More than one layer present in the filtering material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
- B01D2239/06—Filter cloth, e.g. knitted, woven non-woven; self-supported material
- B01D2239/065—More than one layer present in the filtering material
- B01D2239/0654—Support layers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
- B01D2239/10—Filtering material manufacturing
-
- 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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
- Y02A50/2351—Atmospheric particulate matter [PM], e.g. carbon smoke microparticles, smog, aerosol particles, dust
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Filtering Materials (AREA)
Abstract
The invention discloses an air filtering material with a corrugated structure, which comprises a nanofiber layer, a microfiber filter layer and a supporting layer which are sequentially arranged from top to bottom, wherein the supporting layer is a U-shaped wavy corrugated board, the opening side of a U-shaped groove of the supporting layer is an air inlet side, and the nanofiber layer and the microfiber filter layer are arranged on the air inlet surface of the supporting layer; the supporting layer is made of polyolefin non-woven material, and the gram weight of the supporting layer per unit area is 70-180g/m 2 The method comprises the steps of carrying out a first treatment on the surface of the The microfiber filter layer is a polyolefin short fiber layer with a fiber diameter of 0.5-2.5um and a fiber length of less than or equal to 3mm, and the adhesion amount of the fiber of the microfiber filter layer on the supporting layer is 2-10g/m 2 The method comprises the steps of carrying out a first treatment on the surface of the The nanofiber layer is made of polyolefin, the fiber diameter is less than or equal to 500nm, and the thickness of the nanofiber layer is 40-145um. The corrugated structure air filtering material provided by the invention has the nanofiber layer and good filtering effectAnd the service life is long, and the condition that the filtering structure is damaged is not easy to occur.
Description
Technical Field
The invention relates to the technical field of filter materials, in particular to an air filter material with a corrugated structure and a preparation method thereof.
Background
In the filtration industry, nanofibers are often used as functional materials that reduce drag while improving efficiency, and often such functionality is evident when the nanofiber diameter is less than or equal to 100 nm. In the existing application technology, the nano-fiber is often used as an additional layer of the traditional filter medium, namely, a single layer is positioned in an air inlet layer or an intermediate layer or an inner layer, but because the nano-fiber is thinner and weaker, a protective layer such as non-woven fabric is usually applied on the surface of the nano-fiber. This increases some resistance and reduces some efficacy of the nanofiber. When the nano layer is damaged, the filtering efficiency of the filter material is obviously reduced, and even failure occurs, so that the service life is shortened.
The nanofiber has a filtering principle mainly of surface filtration due to the finer fibers, i.e. serves as a surface for trapping dirt during operation, like a porous net or screen. Dirt particles accumulate on a geometric plane of the surface near the upstream of the media and are therefore easily clogged by dirt, losing filtering capacity. Its capacity for receiving dirt is generally low and the filter material needs to be replaced when the difference between the two layers of the filter material reaches a certain value.
The depth filter material is generally permeable and has a plurality of through-holes therein. Its filtration takes place over the entire thickness. Some of the dirt particles are blocked at the surface near the upstream of the media, some smaller particles enter the interior of the filter media and are adsorbed on the walls of the pores under the action of shrinkage, expansion, etc., or are filtered out by sedimentation caused by bridge and fluid direction change. Therefore, the depth type filter medium has larger dirt holding capacity, better filtering effect than the surface type filter medium and longer service life.
Disclosure of Invention
The invention aims at solving the problems and providing the corrugated structure air filtering material with good filtering effect and long service life, which is provided with the nanofiber layer, does not need to apply a protective layer on the surface of the nanofiber, and can simultaneously maximize the function of reducing resistance and improving efficiency of the nanofiber; in the use, the condition that the filter structure is damaged is difficult to appear.
In order to achieve the purpose, the invention adopts the following technical scheme:
the air filtering material with the corrugated structure comprises a nanofiber layer, a microfiber filtering layer and a supporting layer which are sequentially arranged from top to bottom, wherein the supporting layer is a U-shaped wavy corrugated board, the opening side of a U-shaped groove of the supporting layer is an air inlet side, and the nanofiber layer and the microfiber filtering layer are arranged on the air inlet surface of the supporting layer;
the supporting layer is made of polyolefin non-woven material, and the gram weight of the supporting layer in unit area is 70-180g/m 2 ；
The microfiber filter layer is a polyolefin short fiber layer with the fiber diameter of 0.5-2.5um and the fiber length less than or equal to 3mm, and the adhesion amount of the fiber of the microfiber filter layer on the supporting layer is 2-10g/m 2 ；
The nanofiber layer is made of polyolefin, the fiber diameter is less than or equal to 500nm, and the thickness of the nanofiber layer is 40-145um.
Preferably, the filter material has a flute height of 3-5mm and a flute width of 2.5-4mm.
The fiber material of the microfiber filter layer is polyester or polyamide;
the raw material polyolefin of the nanofiber layer comprises polyester, polyamide and polypropylene;
the compressive strength of the supporting layer is more than or equal to 50Pa, and the air permeability is more than or equal to 1200L/m2.S.
Preferably, the microfiber filtration layer is combined with the support layer by a binder, preferably an acrylic binder.
Preferably, the microfiber filter layer staple fibers are crimped staple fibers;
the microfiber filter layer has a fiber length of 0.5-2.5mm or 1-3mm or 1-2mm.
Preferably, the fiber diameter of the nanofiber layer is 50-500nm or 100-500nm or 130-450nm; the thickness of the nanofiber layer is 45-145um.
Preferably, the included angle between two adjacent U-shaped grooves of the filter material is an acute angle a.
The invention also provides a preparation method of the corrugated structure air filtering material, which comprises the following steps:
(1) Preparing a composite layer material: and uniformly mixing the short fibers serving as raw materials of the microfiber filter layer with a binder to obtain a mixture, wherein the solid content of the binder accounts for 2-5% of the total weight of the mixture. Taking a U-shaped wavy supporting layer, uniformly spraying a mixture of short fibers and an adhesive on an air inlet surface of the U-shaped wavy supporting layer by using a spray gun, and performing roller treatment to obtain a composite material with a microfiber filter layer;
(2) Preparing a nanofiber layer on the microfiber filter layer of the composite layer prepared in the step (1) in an electrostatic spinning mode:
and (3) compounding the raw material polyolefin of the nanofiber layer on the composite layer prepared in the step (1) by adopting a melt spinning method, injecting the raw material melt material into electrostatic spinning equipment, placing the composite layer on a receiving rod of the electrostatic spinning equipment, enabling a groove of a U-shaped groove of the composite layer to be opposite to a spinning nozzle, keeping the distance between the spinning nozzle and the groove bottom of the U-shaped groove to be 10-20cm, injecting spinning solution into a spinning solution storage, setting operation parameters, starting the electrostatic spinning equipment, forming a jet flow at the spinning nozzle under the action of an electric field, and accelerating movement along the direction of the electric field to finally obtain the nanofiber layer on a microfiber filter layer of the composite layer.
The working parameters of the electrostatic spinning in the step (2) are as follows: the voltage of the electrostatic spinning equipment is 15-35 kV, the flow rate of the spinning solution is 1.0-2.5 ml/L, the ambient temperature is kept at 25-30 ℃, the ambient humidity is kept at 35-45%, and the receiving distance is 10-20 cm; preferably, the voltage of the electrostatic spinning equipment is 15-25 kV or 15-20 kV, the flow rate of the spinning solution is 1.1-2.3 ml/L or 1.2-2.1 ml/L, the ambient temperature is kept at 25-28 ℃, and the receiving distance is 13-20 cm or 15-20 cm.
In the technical scheme of the preparation method, the supporting layer is prepared by adopting polyolefin non-woven materials, preparing non-woven fabrics through a spun-bonded non-woven process, and hot-pressing and shaping the corrugated paper.
The beneficial effects of the invention are as follows:
the supporting layer is used for providing mechanical strength perpendicular to the filter material and parallel to the filter material, so that the use requirement and the filter requirement can be met; secondly, the supporting layer requires to possess corrugated wave structure, and its effect has two aspects, has increased filtration area on the one hand, and on the other hand makes nanofiber most sunken inside the material through folding mode, and little part exposes in the skin, avoids the microfiber filter layer to receive the damage, changes into deep filtration by surface filtration to reduce filtration resistance when increasing filtration efficiency, improve dust holding efficiency, increase life.
The microfiber filter layer has the function of forming a rougher surface on the air inlet surface of the support layer than the air outlet surface, so that electrostatic spinning nanofibers are conveniently loaded, and the nanofibers are in a deep structure. The microfiber filter layer grammage and fiber diameter determine the structural state of the microfiber filter layer. Too low a grammage does not create a lamellar effect, too high a grammage results in too compact a microfiber filter layer, lacking large pores, and being detrimental to the depth of formation structure of the nanofibers. Too large or too small a fiber diameter is detrimental to forming a microfiber filter layer having a certain elasticity, a certain depth, and a certain porosity.
In the case of electrospinning, the probability of attachment of electrospinning is regarded as uniform on a unit horizontal plane, and the corrugated structure increases the filtering area, so that the area of electrospun fibers deposited on the corrugated structure is increased compared with that of a planar filtering layer (that is, the corrugated supporting layer has a larger accumulated amount than that of the planar supporting layer under the same accumulated thickness of the supporting layer, or the corrugated supporting layer has a thinner thickness under the same accumulated amount of the nanofiber layer), and the nanofiber layer can have a certain depth structure due to the coarse microfiber filtering layer on the surface of the supporting layer.
The corrugated structure filter material adopts the U-shaped grooves, the included angle between two adjacent U-shaped grooves is an acute angle, and the opening side of the U-shaped groove is an air inlet side, so that the wind resistance can be reduced, and meanwhile, the collapse of the acute angle between the two adjacent U-shaped grooves in the using process is reduced.
The corrugated structure filter material is applied to an air filter or an air inlet system of an air conditioner, and is high in dust filtering efficiency and good in effect.
Drawings
Fig. 1 is a schematic structural view of a corrugated air filter material of the present invention.
Fig. 2 is an enlarged schematic view of a U-shaped groove of the corrugated air filter material of fig. 1.
Detailed Description
The invention is further illustrated, but is not limited, by the following examples.
The experimental methods in the following examples are conventional methods unless otherwise specified.
Description of the terminology:
edge width and edge height: see GB/T6544-2008 corrugated board.
U-shaped groove: refers to a single groove on the corrugated filter material.
The invention relates to an air filtering material with a corrugated structure, which comprises a nanofiber layer 1, a microfiber filter layer 2 and a support layer 3 which are sequentially arranged from top to bottom, wherein the support layer 3 is a U-shaped corrugated board, the open side of a U-shaped groove of the support layer 3 is an air inlet side, and the nanofiber layer 1 and the microfiber filter layer 2 are arranged on the air inlet surface of the support layer 3. The flute height of the filter material is 3-5mm, and the flute width is 2.5-4mm. The included angle between two adjacent U-shaped grooves of the filter material is an acute angle a.
Wherein the supporting layer is made of polyolefin non-woven material, and the gram weight of the supporting layer in unit area is 70-180g/m 2 The method comprises the steps of carrying out a first treatment on the surface of the The supporting layer is obtained by preparing non-woven fabrics from polyolefin non-woven materials through a spun-bonded non-woven process and hot-pressing shaping corrugated, wherein the technology is the prior art, and the shaping can be prepared according to the prior art. The microfiber filter layer is a polyolefin short fiber layer with a fiber diameter of 0.5-2.5um (preferably 1-2.5um or 1.5-2.5um or 1-2 um), a fiber length less than or equal to 3mm (preferably 0.5-2.5mm or 1-3mm or 1-2 mm), and the adhesion amount of the fiber of the microfiber filter layer on the support layer is 2-10g/m 2 (preferably 2-7 g/m) 2 Or 2-5g/m 2 Or 5-10g/m 2 Or 5-7g/m 2 ) The method comprises the steps of carrying out a first treatment on the surface of the The nanofiber layer is made of polyolefin, and has a fiber diameter less than or equal to 500nm (preferably 50-500nm or 100-500nm or 130-450 nm) and the thickness of the nanofiber layer is 40-145um (preferably 45-145um or 65-145um or 45-80 um). The fiber material of the microfiber filter layer is polyester or polyamide, and the microfiber filter layer short fiber is crimped short fiber (the crimped short fiber can be directly purchased from the market); the raw material polyolefin of the nanofiber layer comprises polyester, polyamide and polypropylene; the compressive strength of the supporting layer is more than or equal to 50Pa, and the air permeability is more than or equal to 1200L/m2.S. The microfiber filtration layer is combined with the support layer by a binder, preferably an acrylic binder.
The preparation method of the corrugated structure air filtering material comprises the following steps:
(1) Preparing a composite layer material: and uniformly mixing the short fibers serving as raw materials of the microfiber filter layer with a binder to obtain a mixture, wherein the solid content of the binder accounts for 2-5% of the total weight of the mixture. Taking a U-shaped wavy supporting layer, uniformly spraying a mixture of short fibers and an adhesive on an air inlet surface of the U-shaped wavy supporting layer by using a spray gun, and performing roller treatment to obtain a composite material with a microfiber filter layer;
(2) Preparing a nanofiber layer on the microfiber filter layer of the composite layer prepared in the step (1) in an electrostatic spinning mode:
and (3) compounding the raw material polyolefin of the nanofiber layer on the composite layer prepared in the step (1) by adopting a melt spinning method, injecting the raw material melt material into electrostatic spinning equipment, placing the composite layer on a receiving rod of the electrostatic spinning equipment, enabling a groove of a U-shaped groove of the composite layer to be opposite to a spinning nozzle, keeping the distance between the spinning nozzle and the groove bottom of the U-shaped groove to be 10-20cm, injecting spinning solution into a spinning solution storage, setting operation parameters, starting the electrostatic spinning equipment, forming a jet flow at the spinning nozzle under the action of an electric field, and accelerating movement along the direction of the electric field to finally obtain the nanofiber layer on a microfiber filter layer of the composite layer. The working parameters of the electrostatic spinning are as follows: the voltage of the electrostatic spinning equipment is 15-35 kV, the flow rate of the spinning solution is 1.0-2.5 ml/L, the ambient temperature is kept at 25-30 ℃, the ambient humidity is kept at 35-45%, and the receiving distance is 10-20 cm; preferably, the voltage of the electrostatic spinning equipment is 15-25 kV or 15-20 kV, the flow rate of the spinning solution is 1.1-2.3 ml/L or 1.2-2.1 ml/L, the ambient temperature is kept at 25-28 ℃, and the receiving distance is 13-20 cm or 15-20 cm.
The melt spinning method is a spinning method in which a raw polymer is melted to obtain a spinning melt, the spinning melt is quantitatively extruded from a spinneret orifice to form trickles, the trickles are solidified through air or water cooling, and the spinning melt is wound into fibers at a certain speed, and the method is the prior art and comprises the following steps: (1) preparing a spinning melt (melt of fiber-forming polymer chips or melt produced by continuous polymerization); (2) extruding the melt through a spinneret orifice to form a melt trickle; (3) cooling and solidifying the melt trickle to form nascent fibers; (4) oiling and winding the primary fiber. Melt spinning is a direct spinning method and a chip spinning method. The spinning melt is generally pure raw polymer, and flame retardant, antibacterial agent, bactericide and the like with granularity smaller than 20nm can be optionally added according to the situation.
The corrugated filter material of table 1 was prepared as described above:
TABLE 1
The properties of the corrugated paper filter media in table 1 were examined:
measuring the air permeability according to ASTM D737-2018 "standard test method for air permeability of textile fabrics";
fiber diameter was tested using SEM;
the gram weight is tested by using GB/T451.2-2002 'determination of quantitative amount of paper and paper board';
the compressive strength of the prepared filter material is tested, the filter material is placed on a plane, modules with different pressures are placed on the upper surface of the corrugated, and the modules take 10pa as gradient, so that the collapse deformation condition of the corrugated is visually examined. When the module is deformed, the last module is considered to be corrugated for compressive strength.
Air resistance and filtration efficiency test criteria refer to the counting method in GB/T6165-2021 efficiency and resistance of efficient air Filter Performance test method.
The detection method of the gram weight of the unit area of the supporting layer comprises the following steps: after the corrugation of the supporting layer is pulled to be flatTaking 10 pieces of 100cm 2 The gram weights G of all the wafers are weighed, the gram weight M of unit area is calculated, and the calculation formula is as follows:
M＝G/(10*0.01)。
the method for calculating the adhesion amount of the microfiber filter layer in table 1: and (3) calculating according to the amount and the attachment area of a mixture obtained by mixing the raw material short fibers of the microfiber filter layer sprayed by the spray gun with the adhesive, and dividing the amount of the mixture by the attachment area to obtain an attachment amount value.
Average thickness measurement of nanofiber layer: a plurality of small pieces are cut from the filter material, the small pieces are measured under an electron microscope, and the average value is obtained through multipoint test.
The dust holding capacity is the dust holding capacity per unit area, and the unit is g/m 2 The test method comprises preparing filter material into filter (i.e. adding an outer frame to the filter material to obtain 600mm×600mm filter), and filtering with 17m filter area 2 Test air volume 4000m 3 And/h, terminating the resistance by 600pa, testing the dust holding capacity of the filter by referring to ISO 1689, and calculating the dust holding capacity per unit area.
The detection results are shown in tables 1 and 2:
TABLE 2
Examples 1-3, 5-7 were similar in structure, and therefore, only examples 1, 7 were tested for dust holding capacity.
In table 1, the support layers of comparative examples 1 to 3 were flat plates, were not provided in the form of wavy corrugations, and the support layer of comparative example 4 was provided in the form of wavy corrugations. As is apparent from the results of table 2, the support layer of comparative example 1 was a flat plate, and the microfiber filter layer and the nanofiber layer were combined, and compared with example 1, the dust holding amount was lower, and the air resistance was higher at the same air filtration efficiency. Comparative example 2 is different from example 4 in that the support layer is in a flat plate shape, and the air resistance is significantly higher at the same air filtration efficiency as that of example 4. Comparative example 3 has a flat support layer compared to example 1, and no microfiber filter layer was provided, and the dust holding amount of comparative example 3 was significantly reduced compared to example 1. Comparative example 4 is different from example 1 in that no microfiber filter layer was provided, and air resistance of comparative example 4 is significantly higher and dust holding amount is significantly reduced compared to example 1.
Claims (10)
1. An air filter material with a corrugated structure, which is characterized in that: the novel corrugated board comprises a nanofiber layer, a microfiber filter layer and a supporting layer which are sequentially arranged from top to bottom, wherein the supporting layer is a U-shaped wavy corrugated board, the opening side of a U-shaped groove of the supporting layer is an air inlet side, and the nanofiber layer and the microfiber filter layer are arranged on the air inlet surface of the supporting layer;
the supporting layer is made of polyolefin non-woven material, and the gram weight of the supporting layer in unit area is 70-180g/m 2 ；
The microfiber filter layer is a polyolefin short fiber layer with the fiber diameter of 0.5-2.5um and the fiber length less than or equal to 3mm, and the adhesion amount of the fiber of the microfiber filter layer on the supporting layer is 2-10g/m 2 ；
The nanofiber layer is made of polyolefin, the fiber diameter is less than or equal to 500nm, and the thickness of the nanofiber layer is 40-145um.
2. A corrugated air filtration material according to claim 1, wherein: the flute height of the filter material is 3-5mm, and the flute width is 2.5-4mm.
3. A corrugated air filtration material according to claim 1, wherein:
the fiber material of the microfiber filter layer is polyester or polyamide;
the raw material polyolefin of the nanofiber layer comprises polyester, polyamide and polypropylene;
the compressive strength of the supporting layer is more than or equal to 50Pa, and the air permeability is more than or equal to 1200L/m2.S.
4. A corrugated air filtration material according to claim 1, wherein: the microfiber filter layer is combined with the support layer by a binder, preferably an acrylic binder.
5. A corrugated air filtration material according to claim 1, wherein:
the microfiber filter layer staple fibers are crimped staple fibers;
the microfiber filter layer has a fiber length of 0.5-2.5mm or 1-3mm or 1-2mm.
6. A corrugated air filtration material according to claim 1, wherein: the fiber diameter of the nanofiber layer is 50-500nm or 100-500nm or 130-450nm; the thickness of the nanofiber layer is 45-145um.
7. A corrugated air filtration material according to claim 1, wherein: the included angle between two adjacent U-shaped grooves of the filter material is an acute angle a.
8. A method of producing a corrugated air filter material according to any one of claims 1 to 7, comprising the steps of:
(1) Preparing a composite layer material: and uniformly mixing the short fibers serving as raw materials of the microfiber filter layer with a binder to obtain a mixture, wherein the solid content of the binder accounts for 2-5% of the total weight of the mixture. Taking a U-shaped wavy supporting layer, uniformly spraying a mixture of short fibers and an adhesive on an air inlet surface of the U-shaped wavy supporting layer by using a spray gun, and performing roller treatment to obtain a composite material with a microfiber filter layer;
(2) Preparing a nanofiber layer on the microfiber filter layer of the composite layer prepared in the step (1) in an electrostatic spinning mode:
and (3) compounding the raw material polyolefin of the nanofiber layer on the composite layer prepared in the step (1) by adopting a melt spinning method, injecting the raw material melt material into electrostatic spinning equipment, placing the composite layer on a receiving rod of the electrostatic spinning equipment, enabling a groove of a U-shaped groove of the composite layer to be opposite to a spinning nozzle, keeping the distance between the spinning nozzle and the groove bottom of the U-shaped groove to be 10-20cm, injecting spinning solution into a spinning solution storage, setting operation parameters, starting the electrostatic spinning equipment, forming a jet flow at the spinning nozzle under the action of an electric field, and accelerating movement along the direction of the electric field to finally obtain the nanofiber layer on a microfiber filter layer of the composite layer.
9. The method of manufacturing according to claim 8, wherein:
the working parameters of the electrostatic spinning in the step (2) are as follows: the voltage of the electrostatic spinning equipment is 15-35 kV, the flow rate of the spinning solution is 1.0-2.5 ml/L, the ambient temperature is kept at 25-30 ℃, the ambient humidity is kept at 35-45%, and the receiving distance is 10-20 cm; preferably, the voltage of the electrostatic spinning equipment is 15-25 kV or 15-20 kV, the flow rate of the spinning solution is 1.1-2.3 ml/L or 1.2-2.1 ml/L, the ambient temperature is kept at 25-28 ℃, and the receiving distance is 13-20 cm or 15-20 cm.
10. The method of manufacturing according to claim 8, wherein:
the supporting layer is made of polyolefin nonwoven material, nonwoven fabric is prepared by a spunbonding nonwoven process, and the corrugated board is obtained by hot pressing.
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