CN117180853B - Oil mist adsorption composite material and preparation method and application thereof - Google Patents
Oil mist adsorption composite material and preparation method and application thereof Download PDFInfo
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- CN117180853B CN117180853B CN202311214430.9A CN202311214430A CN117180853B CN 117180853 B CN117180853 B CN 117180853B CN 202311214430 A CN202311214430 A CN 202311214430A CN 117180853 B CN117180853 B CN 117180853B
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Abstract
The invention relates to the technical field of range hoods, in particular to an oil mist adsorption composite material and a preparation method and application thereof. The oil mist adsorption composite material comprises a first filter layer and a second filter layer which are arranged in a stacked manner, and a connecting layer arranged between the first filter layer and the second filter layer; the first filter layer is mainly composed of inorganic fiber materials, and is mainly prepared by preparing inorganic fiber materials through melting and wiredrawing of the inorganic materials, and lapping and shaping the inorganic fiber materials; the inorganic material comprises glass, and the inorganic fiber material comprises glass fibers; the second filter layer is made primarily of polymeric fibers through a needle punching process or made primarily of polymeric materials through a melt blowing process. The oil mist adsorption composite material has high filtering efficiency, and can effectively intercept oil mist or smoke dust with the particle diameter as low as 0.3 mu m.
Description
Technical Field
The invention relates to the technical field of range hoods, in particular to an oil mist adsorption composite material and a preparation method and application thereof.
Background
The current household range hood aims at oil smoke separation, and the main modes comprise: collecting oil mist by utilizing a centrifugal separation technology, and cleaning and replacing periodically; filtering oil smoke by using a metal primary filter screen, and intercepting large-particle oil mist by inertial collision; or chemical fiber high-efficiency filter paper such as PA material is used for filtering, and the filtering precision is high.
However, the above methods have drawbacks. For example, the centrifugal filtration method has insufficient oil mist filtration efficiency and mainly plays a role in purification by discharging.
In addition, the existing metal filter screen adopts a mechanical equipment punching process, the punching aperture size is 1-4 mm, and the metal filter screen has a filtering and intercepting function on large-particle oil mist liquid drops and the like, but cannot intercept oil mist or smoke dust with the particle diameter lower than 10 microns.
The chemical fiber high-efficiency filter material is used for single-layer filtration, and after a large amount of oil mist is accumulated, an oil film is formed on the surface of the chemical fiber high-efficiency filter material, and the oil film leads to blockage of fine pore channels of the material, reduces air permeability, increases resistance and leads to reduction of suction force of the oil smoke fan.
In view of this, the present invention has been made.
Disclosure of Invention
A first object of the present invention is to provide an oil mist adsorption composite material having a double filtration function, high filtration efficiency, and capable of effectively intercepting oil mist or smoke having a diameter as low as 0.3 μm.
The second aim of the invention is to provide a preparation method of the oil mist adsorption composite material.
The third object of the invention is to provide a filter device for a range hood.
A fourth object of the present invention is to provide a range hood.
In order to achieve the above object of the present invention, the following technical solutions are specifically adopted:
the invention provides an oil mist adsorption composite material, which comprises a first filter layer, a second filter layer and a connecting layer, wherein the first filter layer and the second filter layer are arranged in a stacked mode;
The first filter layer is mainly made of inorganic fiber materials, and is mainly made of inorganic fiber materials through melting and wiredrawing, and the inorganic fiber materials are paved and shaped; the inorganic material comprises glass, the inorganic fiber material comprises glass fibers, and the diameter of the inorganic fiber material obtained after the inorganic material is drawn is 10-80 mu m; the gram weight of the first filter layer is 90-400 g/m 2 after the shaping, and the thickness of the first filter layer is 5-50 mm after the shaping;
The second filter layer is mainly prepared from polymer fibers through a needling process, or the second filter layer is mainly prepared from polymer materials through a melt blowing process; wherein the polymer fibers comprise PP fibers and/or PLA fibers, and the polymer material comprises PP and/or PLA; the gram weight of the second filter layer is 35-150 g/m 2, the thickness of the second filter layer is 0.3-2 mm, and the second filter layer is provided with electrostatic charges.
The invention also provides a preparation method of the oil mist adsorption composite material, which comprises the following steps:
After the adhesive material is sprayed on the first surface of the first filter layer, the second filter layer is attached to the first surface containing the adhesive material, or after the adhesive material is sprayed on the second surface of the second filter layer, the first filter layer is attached to the second surface containing the adhesive material; and then curing, and obtaining the oil mist adsorption composite material after the curing is completed.
The invention also provides a filter device for the range hood, which comprises the oil mist adsorption composite material.
The invention also provides a range hood, which comprises the filtering device for the range hood.
Compared with the prior art, the invention has the beneficial effects that:
(1) The oil mist adsorption composite material provided by the invention has a double filtering effect by adopting the specific first filter layer and the specific second filter layer to be matched for use, and has high filtering efficiency.
(2) The oil mist adsorption composite material provided by the invention can effectively intercept oil mist or smoke dust with the particle size as low as 0.3 mu m.
(3) According to the oil mist adsorption composite material provided by the invention, through the arrangement of the first filter layer, a large amount of oil mist can be adsorbed, the oil mist adsorption capacity is improved, oil mist particles can not immediately enter the second filter layer, the resistance of the oil mist adsorption composite material is reduced, and the problem of reduction of the suction force of the oil smoke fan is solved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of an oil mist adsorption composite material provided by the invention.
Detailed Description
The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings and detailed description, but it will be understood by those skilled in the art that the examples described below are some, but not all, examples of the present invention, and are intended to be illustrative of the present invention only and should not be construed as limiting the scope of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention. The specific conditions are not noted in the examples and are carried out according to conventional conditions or conditions recommended by the manufacturer. The reagents or apparatus used were conventional products commercially available without the manufacturer's attention.
The invention provides an oil mist adsorption composite material, which comprises a first filter layer, a second filter layer and a connecting layer, wherein the first filter layer and the second filter layer are arranged in a stacked mode, and the connecting layer is arranged between the first filter layer and the second filter layer. Fig. 1 is a schematic structural diagram of an oil mist adsorption composite material provided by the invention.
In use, the oil mist particles pass through the first filter layer and then the second filter layer. Wherein, first filter layer and second filter layer all play the effect of filtration, interception oil mist granule. The connection layer mainly plays a role of connecting (bonding) the first filter layer and the second filter layer.
The first filter layer is mainly made of inorganic fiber materials, and is mainly made of inorganic fiber materials through melting and wiredrawing, and the inorganic fiber materials are paved and shaped; the inorganic material comprises glass and the inorganic fiber material comprises glass fibers. The inorganic fiber material provided by the invention has good oil absorption property, and is beneficial to improving the adsorption effect on oil mist particles.
The diameter of the inorganic fiber material obtained after the inorganic material is subjected to the wire drawing is 10-80 mu m; including but not limited to a dot value of any one of 10 μm, 20 μm, 30 μm, 40 μm, 50 μm, 60 μm, 70 μm, 80 μm, or a range value between any two.
The grammage of the first filter layer after the shaping is 90-400 g/m 2, including but not limited to a point value of any one of 100g/m2、130g/m2、150g/m2、180g/m2、200g/m2、250g/m2、300g/m2、350g/m2、380g/m2 or a range of values between any two.
The thickness of the first filter layer after the shaping is 5 to 50mm, including but not limited to a point value of any one of 10mm, 15mm, 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, or a range value between any two.
The second filter layer is mainly prepared from polymer fibers through a needling process, or the second filter layer is mainly prepared from polymer materials through a melt blowing process; wherein the polymer fibers comprise PP fibers (i.e. polypropylene fibers) and/or PLA fibers (i.e. polylactic acid fibers, also known as corn fibers), and the polymer material comprises PP (i.e. polypropylene) and/or PLA (i.e. polylactic acid).
The polymer fiber and the polymer material provided by the invention have good oil absorption characteristics, are matched with the fiber material for use, and are used for multistage filtration, so that the adsorption effect on oil mist particles can be further improved, the oil mist filtration efficiency is improved, and the filtration life of the material is longer.
The second filter layer has an electrostatic charge thereon.
In some embodiments of the invention, the second filter layer is subjected to an electrostatic electret technique (high voltage electric field) to obtain an electrostatic charge.
The needling process is to convey the polymer fiber to a needling machine for needling after opening, carding and cotton laying. By means of needling, the fibers can be staggered, penetrated and compactly arranged, and the tensile strength of the cloth cover is improved. The needles in the needling process rub against the fibers to form charges on the surfaces of the fibers, and the fine particles are adsorbed. Wherein, the material prepared by the PP through the needling process is also called electrostatic cotton.
The melt blowing process is a one-step technique for directly preparing a web from a polymeric material (polymer melt). The material prepared by the melt-blowing process can obtain electrostatic charges by an electrostatic electret technology (high-voltage electric field). The material prepared by the melt-blowing process of PP is also called PP melt-blowing cloth, and the material prepared by the melt-blowing process of PLA is also called PLA melt-blowing cloth.
The second filter layer is provided with electrostatic charges, so that the filter can play a good role in filtering and adsorbing oil mist particles.
The grammage of the second filter layer is 35-150 g/m 2, including but not limited to a point value of any one of 40g/m2、45g/m2、50g/m2、60g/m2、70g/m2、80g/m2、90g/m2、100g/m2、120g/m2、140g/m2 or a range of values between any two.
The thickness of the second filter layer is 0.3-2 mm, including but not limited to any one of 0.5mm, 0.8mm, 1.0mm, 1.3mm, 1.5mm, 1.8mm, or a range of values therebetween.
According to the oil mist adsorption composite material provided by the invention, the first filter layer is a coarse filter layer, the fibers of the filter layer are inorganic glass fibers, no electric charge is generated on the surfaces of the fibers, the filter effect on fine particles is avoided, and the interception effect on large particles is realized. The second layer is a fine filter layer, the fiber surface of the fine filter layer is enriched with static electricity, and particles as small as 0.3 mu m can be strongly adsorbed, so that good filtering efficiency is shown.
According to the oil mist adsorption composite material provided by the invention, the fiber material with a specific diameter is adopted, the first filter layer is obtained through irregular interweaving, the formed gap channel is between 20 and 1000 mu m, and the fiber material is used for adsorbing oily mist particles, so that the primary filtration and interception effects can be achieved. The remaining oil mist particles then enter a second filter layer, which, due to electrostatic adsorption, is capable of filtering and intercepting oil mist particles having a particle size as low as 0.3 μm. Therefore, the oil mist adsorption composite material provided by the invention has double filtration effect and high filtration efficiency, and also has excellent filtration interception effect on oil mist droplets with small particles (the particle size is as low as 0.3 mu m).
Furthermore, the material of the first filter layer provided by the invention is fluffy, a large amount of oil mist can be adsorbed, the oil mist capacity is increased, oil mist particles can not immediately enter the second filter layer to contact, the degree of increasing the material resistance of the second filter layer is further relieved, and the phenomenon that the suction force of the oil smoke fan is reduced due to the fact that the material resistance of the second filter layer is rapidly increased is avoided. Therefore, the oil mist adsorption composite material provided by the invention has large adsorption capacity and longer service life.
Preferably, the diameter of the inorganic fiber material obtained after the drawing of the inorganic material is 20 to 60 μm, including but not limited to a point value of any one of 20 μm, 30 μm, 50 μm or a range value between any two.
The first filter layer is primarily adsorbed by intermolecular forces between the fibrous materials. The adoption of the fiber filaments with specific diameters is beneficial to improving the adsorption effect on oil mist particles.
Preferably, the polymer fibers have a fiber fineness of 1.5 to 7D, including but not limited to a point value of any one of 1.5D, 2.5D, 3D, 4D, 5D, 6D, 7D or a range of values between any two. Wherein D is an index describing the fiber thickness, and chinese is named denier.
The polymer fiber with the fineness is beneficial to further improving the adsorption efficiency of oil mist particles.
Preferably, the second filter layer may adsorb particulates having a particle size of 0.3 to 10 μm, wherein the particle size includes, but is not limited to, a dot value of any one of 0.5 μm, 1 μm, 2 μm, 3 μm, 4 μm, 5 μm, 6 μm, 7 μm, 8 μm, 9 μm, or a range value between any two.
The second filter layer (oil mist adsorption composite material) provided by the invention can intercept oil mist or smoke dust with particle diameters as low as 0.3 microns, and solves the technical problem that a metal filter screen in the prior art is too large in pore diameter to intercept small-particle oil mist or smoke dust.
Preferably, the second filter layer has a filtration efficiency of 20% to 99.97% for particles having a particle size of 0.3 μm at an air flow rate of 32L/min, including but not limited to any one of the point values or range values between any two of 25%, 30%, 35%, 40%, 45%, 50%, 60%, 70%, 80%, 85%, 90%, 95%, 99%. It can be seen that the second filter layer (oil mist adsorption composite) has a higher filtration efficiency for particulate matter having a particle size=0.3 μm.
More preferably, the second filter layer has a filtration efficiency of 40 to 85% for particles having a particle diameter of 0.3 μm at an air flow rate of 32L/min.
Preferably, the connection layer is mainly formed by curing an adhesive material.
In some specific embodiments of the present invention, the method for forming the connection layer includes: diluting the emulsion type adhesive material with water in a certain proportion, or heating and melting the adhesive material into a liquid state, then spraying the liquid state on the surface of the first filter layer and/or the second filter layer, and then solidifying.
Preferably, the adhesive material includes at least one of an emulsion type adhesive and a thermoplastic synthetic resin type adhesive.
Preferably, the emulsion type adhesive comprises a vinyl acetate-ethylene copolymer emulsion.
In some specific embodiments of the present invention, when the adhesive material is a vinyl acetate-ethylene copolymer, in addition to the vinyl acetate-ethylene copolymer emulsion, water is added as a diluent in actual production, and the mass fraction of the vinyl acetate-ethylene copolymer in the adhesive material is 35% -65%.
Preferably, the thermoplastic synthetic resin based adhesive includes at least one of a Polyolefin (PO) hot melt adhesive, an ethylene-vinyl acetate copolymer (EVA) hot melt adhesive, and a styrene-butadiene-styrene block copolymer (SBS).
The invention also provides a preparation method of the oil mist adsorption composite material, which comprises the following steps:
And after the curing is completed, a connecting layer is formed, and the oil mist adsorption composite material comprising the first filter layer, the connecting layer and the second filter layer is obtained. The first filter layer comprises two surfaces (an upper surface and a lower surface), and the adhesive material is sprayed on one surface.
Or after the adhesive material is sprayed on the second surface of the second filter layer, attaching the first filter layer to the second surface containing the adhesive material, then curing, and forming a connecting layer after the curing is completed to obtain the oil mist adsorption composite material comprising the first filter layer, the connecting layer and the second filter layer. The second filter layer comprises two surfaces (an upper surface and a lower surface), and the adhesive material is sprayed on one surface.
The preparation method of the oil mist adsorption composite material provided by the invention is simple, easy to implement, short in process flow and suitable for mass production.
When the adhesive material is sprayed, if the emulsion type adhesive is adopted as the adhesive material, water is added as a diluent, namely: adding a certain amount of water into the emulsion type adhesive, uniformly mixing, and then spraying. If hot melt adhesives and/or hot melt pressure-sensitive adhesives are used as the adhesive material, the hot melt adhesives and/or hot melt pressure-sensitive adhesives are melted into a liquid state and then sprayed.
Wherein the curing comprises the curing of emulsion type adhesives and the curing of hot melt adhesives. In some embodiments of the present invention, the method of curing the emulsion adhesive includes: and (3) drying at normal temperature or drying under the condition of hot air, and evaporating the water in the emulsion type adhesive to enable the emulsion type adhesive to be solidified into solid. The method for curing the hot melt adhesive and the hot melt pressure-sensitive adhesive comprises the following steps: and cooling the liquid hot melt adhesive or the liquid hot melt pressure sensitive adhesive to enable the liquid hot melt adhesive or the liquid hot melt pressure sensitive adhesive to be solid.
In some embodiments of the present invention, the adhesive material is sprayed (sprinkled) only as a thin layer, so that the thickness of the connection layer is negligible.
The invention also provides a filter device for the range hood, which comprises the oil mist adsorption composite material.
The filtering device for the range hood has high filtering efficiency on oil mist and oil smoke and long service life.
The invention also provides a range hood, which comprises the filtering device for the range hood.
The range hood has high filtering efficiency on oil mist and oil fume, long service life and good suction force.
Embodiments of the present invention will be described in detail below with reference to examples, but it will be understood by those skilled in the art that the following examples are only for illustrating the present invention and should not be construed as limiting the scope of the present invention. The specific conditions are not noted in the examples and are carried out according to conventional conditions or conditions recommended by the manufacturer. The reagents or apparatus used were conventional products commercially available without the manufacturer's attention.
In the examples below, the diameters of the glass fibers obtained after drawing the glass were not completely uniform, and thus the diameters of the glass fibers were within a range.
Example 1
The oil mist adsorption composite material provided by the embodiment comprises a first filter layer and a second filter layer which are arranged in a stacked mode, and a connecting layer arranged between the first filter layer and the second filter layer.
The first filter layer is made of glass fibers, and is made of glass through melting and wire drawing, and the glass fibers are paved and shaped. The diameter of the glass fiber obtained after the glass is drawn is 10-20 mu m; the first filter layer had a grammage of 90g/m 2 and a thickness of 8mm after shaping.
The second filter layer is prepared from PP fibers with fineness of 2.5D and 6D through a needling process, and the mass ratio of the PP fibers to the 6D is 3:1, so that the PP fibers have electrostatic charges. The grammage of the second filter layer was 65g/m 2, and the thickness of the second filter layer was 1mm.
The preparation method of the oil mist adsorption composite material provided by the embodiment comprises the following steps: spraying an acrylic resin solution (the mass fraction is 50%, wherein the solvent is water) on one surface of the second filter layer, covering the sprayed acrylic resin solution with the first filter layer, enabling one surface of the first filter layer to be attached to one surface of the second filter layer, drying and curing under the hot air condition of 80 ℃, and obtaining the oil mist adsorption composite material after 10 minutes.
Example 2
The oil mist adsorption composite material provided by the embodiment comprises a first filter layer and a second filter layer which are arranged in a stacked mode, and a connecting layer arranged between the first filter layer and the second filter layer. The first filter layer is made of glass fibers, and is made of glass through melting and wire drawing, and the glass fibers are paved and shaped. The diameter of the glass fiber obtained after the glass is drawn is 15-35 mu m. The first filter layer had a grammage of 200g/m 2 and a thickness of 25mm after shaping. The second filter layer provided in this example is the same as that in example 1.
The preparation method of the oil mist adsorption composite material provided by the embodiment comprises the following steps: spraying the melted EVA hot melt adhesive on one surface of the first filter layer, covering the second filter layer on the sprayed acrylic resin solution, enabling one surface of the second filter layer to be attached to one surface of the first filter layer, cooling to room temperature, and cooling and solidifying the hot melt adhesive to obtain the oil mist adsorption composite material.
Example 3
The oil mist adsorption composite material provided by the embodiment comprises a first filter layer and a second filter layer which are arranged in a stacked mode, and a connecting layer arranged between the first filter layer and the second filter layer. The first filter layer is made of glass fibers, and is made of glass through melting and wire drawing, and the glass fibers are paved and shaped. The diameter of the glass fiber obtained after the glass is drawn is 30-80 mu m. The first filter layer had a grammage of 400g/m 2 and a thickness of 50mm after shaping. The second filter layer provided in this example is the same as that in example 1.
The preparation method of the oil mist adsorption composite material provided in this example is the same as that in example 1.
Example 4
The oil mist adsorption composite material provided by the embodiment comprises a first filter layer and a second filter layer which are arranged in a stacked mode, and a connecting layer arranged between the first filter layer and the second filter layer. Wherein the first filter layer is the same as the first filter layer in example 1.
The second filter layer provided in this embodiment is made of PLA (polylactic acid) fibers with fineness of 2.5D and 6D, the mass ratio of the two is 3:1, and after carding and needle punching, the second filter layer has electrostatic charges thereon. The grammage of the second filter layer was 40g/m 2, and the thickness of the second filter layer was 0.6mm.
The preparation method of the oil mist adsorption composite material provided in this example is the same as that in example 1.
Example 5
The oil mist adsorption composite material provided by the embodiment comprises a first filter layer and a second filter layer which are arranged in a stacked mode, and a connecting layer arranged between the first filter layer and the second filter layer. Wherein the first filter layer is the same as the first filter layer in example 1.
The second filter layer provided in this embodiment is made of PP (polypropylene) through a melt-blown process, and then is subjected to an electrostatic electret technology treatment, so that the second filter layer has electrostatic charges thereon. The grammage of the second filter layer was 20g/m 2, and the thickness of the second filter layer was 0.5mm.
The preparation method of the oil mist adsorption composite material provided in this example is the same as that in example 1.
Example 6
The oil mist adsorption composite material provided by the embodiment comprises a first filter layer and a second filter layer which are arranged in a stacked mode, and a connecting layer arranged between the first filter layer and the second filter layer. Wherein the first filter layer is the same as the first filter layer in example 1.
The second filter layer provided in this embodiment is made from PLA (polylactic acid) through a melt-blown process, and then is subjected to an electrostatic electret technique treatment, so that the second filter layer has electrostatic charges thereon. The grammage of the second filter layer was 20g/m 2, and the thickness of the second filter layer was 0.5mm.
The preparation method of the oil mist adsorption composite material provided in this example is the same as that in example 1.
Comparative example 1
The oil mist adsorbing material provided in this comparative example was a single layer, specifically the first filter layer of example 1.
Comparative example 2
The oil mist adsorbing material provided in this comparative example was a single layer, specifically the second filter layer of example 1.
Comparative example 3
The oil mist adsorbing material provided in this comparative example was substantially the same as the oil mist adsorbing composite material in example 1, except that: the first filter layer had a grammage of 90g/m 2 and a thickness of 2mm.
The preparation method of the oil mist adsorbing material provided in this comparative example is the same as that of example 1.
Comparative example 4
The oil mist adsorbing material provided in this comparative example was substantially the same as the oil mist adsorbing composite material in example 1, except that: the grammage of the second filter layer was 65g/m 2, and the thickness of the second filter layer was 2mm.
The preparation method of the oil mist adsorbing material provided in this comparative example is the same as that of example 1.
Comparative example 5
The oil mist adsorbing material provided in this comparative example was substantially the same as the oil mist adsorbing composite material in example 5, except that: after the second filter layer is prepared from PP through a melt-blowing process, electrostatic electret technology treatment is not carried out, namely the second filter layer is not provided with electrostatic charges.
The preparation method of the oil mist adsorbing material provided in this comparative example is the same as that of example 5.
Experimental example 1
The oil mist adsorption composite material prepared in each example and the oil mist adsorption material prepared in each comparative example were respectively placed in an oil mist filtration test bench device, and oil mist absorption test measurements were performed, and the detection results are shown in table 1. The oil mist filtering test board is a ventilating duct test board built by referring to the HJ/T62-2001 industry standard, and the wind speed at the wind inlet is set to be 1m/s during testing. And calculating the gram weight of the oil mist absorbed by the material by adopting the mass difference of the material before and after the experiment.
TABLE 1 oil mist absorption test results
The initial resistance is the initial resistance, which is the pressure difference generated between the upstream and downstream of the material under the set wind speed after the brand new unused material is put into the test bench, and the unit is Pa.
The initial oil mist filtration efficiency is the initial filtration efficiency obtained by passing air containing 10mg/m 3 of oil smoke through a new unused material under the condition of a set wind speed, measuring the downstream oil smoke concentration value, and comparing the difference between the two values with the upstream concentration value.
The oil mist absorption gram weight of the material means that the air containing oil mist continuously passes through the obtained material, the generated resistance gradually rises along with the accumulation of the oil mist by the material, when the resistance generated by the material reaches the termination resistance, the collection of the oil mist is stopped, the adsorption material is taken down and weighed, and the difference between the weight of the adsorption material and the weight of the adsorption material when the oil mist is not collected is the oil mist absorption gram weight of the material.
As can be seen from table 1, the oil mist adsorption composite material prepared in each example has higher filtration efficiency and larger oil mist adsorption capacity.
Comparative example 1, however, shows that the filter efficiency is very low without the second filter layer and only with the first filter layer, because no fine fibers are effective in intercepting the oil mist particles. When the ventilating duct is used for oil mist loading test, although the material resistance is only increased by 10Pa, oil mist substances are penetrated through the material and cannot be effectively intercepted on the material, and the purpose of filtering and purifying is not achieved.
While the grammage of the first filter layer was kept constant and the material thickness was reduced (comparative example 3), the initial resistance obtained was increased and the gram of absorbed soot was relatively low when the ending resistance was reached. The initial filtration efficiency is primarily contributed by the second filter layer. Or the gram weight per square meter of the second filter layer is kept unchanged, and the increase of the material thickness (comparative example 4) increases the adsorption gram weight of a certain amount of oil smoke, but decreases the filtration efficiency.
Experimental example 2
The filtration efficiency of the second filtration layer in example 1, the second filtration layer in example 5 and the second filtration layer in example 6 was examined for particles having a particle size of 0.3 μm at an air flow rate of 32L/min, respectively, and the examination results are shown in Table 2 below.
TABLE 2 filtration efficiency of the second filter layer on 0.3 μm particulate matter
| Group of | Filtration efficiency for 0.3 μm particulate matter |
| Second filter layer in example 1 | 80％ |
| The second Filter layer in example 5 | 95％ |
| The second Filter layer in example 6 | 90％ |
As can be seen from Table 2, the second filter layer provided by the present invention has a higher filtration efficiency for particles having a particle size of 0.3 μm at an air flow rate of 32L/min, especially up to 95% in example 5.
While the invention has been illustrated and described with reference to specific embodiments, it is to be understood that the above embodiments are merely illustrative of the technical aspects of the invention and not restrictive thereof; those of ordinary skill in the art will appreciate that: modifications may be made to the technical solutions described in the foregoing embodiments, or equivalents may be substituted for some or all of the technical features thereof, without departing from the spirit and scope of the present invention; such modifications and substitutions do not depart from the spirit of the corresponding technical solutions; it is therefore intended to cover in the appended claims all such alternatives and modifications as fall within the scope of the invention.
Claims (8)
1. The oil mist adsorption composite material is characterized by comprising a first filter layer and a second filter layer which are arranged in a stacked manner, and a connecting layer arranged between the first filter layer and the second filter layer; the connecting layer is mainly formed by curing an adhesive material, wherein the adhesive material comprises at least one of emulsion-type adhesives and thermoplastic synthetic resin adhesives;
The first filter layer is mainly made of inorganic fiber materials, and is mainly made of inorganic fiber materials through melting and wiredrawing, and the inorganic fiber materials are paved and shaped; the inorganic material comprises glass, the inorganic fiber material comprises glass fibers, and the diameter of the inorganic fiber material obtained after the inorganic material is drawn is 10-80 mu m; the gram weight of the first filter layer is 90-400 g/m 2 after the shaping, and the thickness of the first filter layer is 5-50 mm after the shaping;
the second filter layer is mainly prepared from polymer fibers through a needling process, or the second filter layer is mainly prepared from polymer materials through a melt blowing process; the polymer fiber comprises PP fiber and/or PLA fiber, the fiber fineness of the polymer fiber is 1.5-7D, and the polymer material comprises PP and/or PLA; the gram weight of the second filter layer is 35-150 g/m 2, the thickness of the second filter layer is 0.3-2 mm, and the second filter layer is provided with electrostatic charges;
The second filter layer has a filtering efficiency of 40-85% for particles with a particle size of 0.3 μm under the condition that the air flow rate is 32L/min.
2. The oil mist adsorbing composite material according to claim 1, wherein the diameter of the inorganic fiber material obtained after the drawing of the inorganic material is 20 to 60 μm.
3. The oil mist adsorbing composite material according to claim 1, wherein the second filter layer is capable of adsorbing particulate matters having a particle diameter of 0.3 to 10 μm.
4. The oil mist adsorbing composite according to claim 1, wherein the emulsion type adhesive comprises a vinyl acetate-ethylene copolymer emulsion.
5. The oil mist adsorbing composite material according to claim 1, wherein the thermoplastic synthetic resin based adhesive comprises at least one of a polyolefin hot melt adhesive, an ethylene-vinyl acetate copolymer hot melt adhesive, and a styrene-butadiene-styrene block copolymer.
6. The method for producing an oil mist adsorption composite material according to any one of claims 1 to 5, comprising the steps of:
After the adhesive material is sprayed on the first surface of the first filter layer, the second filter layer is attached to the first surface containing the adhesive material, or after the adhesive material is sprayed on the second surface of the second filter layer, the first filter layer is attached to the second surface containing the adhesive material; and then curing, and obtaining the oil mist adsorption composite material after the curing is completed.
7. A filter device for a range hood, comprising the oil mist adsorbing composite material according to any one of claims 1 to 5.
8. A range hood comprising the filter device for a range hood according to claim 7.
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