Modifying device, modifying method, modified fiber filter material and application of fiber filter material

Abstract

The application belongs to the technical field of gas filtration, and particularly relates to a modification device of fiber filter material, a modification method, modified fiber filter material and application. The modification device comprises a filter funnel and a liquid collecting bottle which are connected, wherein the filter funnel comprises a buffer cavity, a liquid collecting cavity and a liquid outlet section from top to bottom, a filter plate is arranged between the buffer cavity and the liquid collecting cavity, and a plurality of through holes are formed in the side wall of the liquid collecting cavity; the liquid collecting bottle comprises a gas inlet. The application is modified on the basis of the existing suction filter bottle, the air outlet is changed into the gas inlet, the gas is used to offset a part of the gravity of the solution, the falling speed of the modified solution is reduced, the contact time of the fiber filter material and the modified solution is prolonged, the effective load of heterogeneous materials is realized, a plurality of through holes are formed in the edge of the funnel below the filter material, the inhaled gas can resist the gravity of the modified solution, and the inhaled gas does not always accumulate in the liquid collecting cavity to cause the gradually increased pressure below the modified solution, so that the modified solution cannot finally fall.

Description

Technical Field

[0001] This invention belongs to the field of gas filtration technology, specifically relating to a device, method, modified fiber filter material, and application for modifying fiber filter material. Background Technology

[0002] In existing technologies, heterogeneous materials, such as two-dimensional nanosheets, are often loaded onto (fiber) filter material substrates to enhance filter performance (e.g., oil-water separation) or impart other functions to the substrate. For these filter substrates with dense fiber distribution or small pore structure, good loading can be achieved using simple physical methods such as vacuum filtration and impregnation. However, in coarse-efficiency filter fiber combined with electrostatic enhancement technology, using loose (or larger-pore) coarse-efficiency fibers as the filter substrate can simultaneously achieve high-efficiency, low-resistance filtration. But when modifying the filter substrate of these coarse-efficiency fiber filters, due to the large pore size between fibers, traditional physical methods such as vacuum filtration and impregnation cannot retain the heterogeneous material, thus failing to achieve a good loading effect. Summary of the Invention

[0003] Therefore, the technical problem to be solved by the present invention is to overcome the defects of the existing technology, such as the inability of traditional filtration and impregnation methods to achieve good loading effect when modifying coarse fibers, so as to provide a fiber filter material modification device, modification method, modified fiber filter material and application.

[0004] Therefore, the present invention provides the following technical solution:

[0005] This invention provides a device for modifying fiber filter media, characterized in that it includes a filter funnel and a collection bottle connected in communication, wherein...

[0006] The filter funnel includes a buffer chamber, a collection chamber, and an outlet section from top to bottom. A filter plate is provided between the buffer chamber and the collection chamber. Several through holes are provided on the side wall of the collection chamber.

[0007] The collection bottle includes an air inlet. Optionally, the air inlet is connected to an air pump for introducing gas.

[0008] Optionally, the pore size of the filter plate is 1mm-3mm;

[0009] And / or, the diameter of the through hole is 0.1mm-1mm;

[0010] And / or, the number of through holes is 5-50 per square centimeter.

[0011] The present invention also provides a method for modifying fiber filter material, using the above-mentioned modification apparatus.

[0012] Optionally, the modification method of the fiber filter material includes the following steps:

[0013] The fiber filter media is placed on the filter plate, the modified liquid is injected into the buffer chamber, gas is blown in through the air inlet, and the modified liquid enters the collection bottle through the collection chamber and the outlet section.

[0014] Optionally, the pore size of the fiber filter material is 50μm-1000μm.

[0015] Optionally, the flow rate of the injected gas is 5-50 L / min.

[0016] Optionally, the filter fiber is made of any one of aramid, polyethylene terephthalate, polyurethane, polytetrafluoroethylene, polyvinylidene fluoride, polyolefin, polylactic acid, activated carbon, and glass fiber.

[0017] Optionally, the content of heterogeneous materials in the modified liquid is 0.01-1%;

[0018] And / or, the mass ratio of heterogeneous material to fiber filter material in the modified solution is 1:1 to 1:10.

[0019] The present invention also provides a modified fiber filter material obtained by the above-described modification method.

[0020] The present invention also provides an application of the above-mentioned modified fiber filter material in electrostatic enhanced filtration.

[0021] Specifically, it can be widely used in public building spaces such as hospitals and office buildings, or in clean rooms such as pharmaceutical factories and chip factories where indoor air quality requirements are high.

[0022] In this invention, the heterogeneous material in the modified solution is a conventional fiber filter material modification material, including but not limited to two-dimensional nanosheets or semiconductor materials; the solvent used can be water or ethanol or other non-toxic and harmless common laboratory solvents.

[0023] The technical solution of this invention has the following advantages:

[0024] The present invention provides a device for modifying fiber filter media, comprising a filter funnel and a collection bottle connected in series. The filter funnel, from top to bottom, includes a buffer chamber, a collection chamber, and a discharge section. A filter plate is disposed between the buffer chamber and the collection chamber. Several through holes are formed on the side wall of the collection chamber. The collection bottle includes an air inlet. The modification device provided by the present invention modifies an existing vacuum filtration bottle by replacing the suction port with an air inlet. Air is blown in to counteract part of the gravity of the solution, reducing the rate at which the modified solution falls, extending the contact time between the fiber filter media and the modified solution, and achieving effective loading of heterogeneous materials. Several through holes are formed on the edge of the funnel below the filter media, ensuring that the blown gas can resist the gravity of the modified solution without accumulating in the collection chamber, causing the pressure below the modified solution to gradually increase and ultimately preventing the modified solution from falling.

[0025] The fiber filter material modification method provided by this invention, using a specific modification device provided by this invention, can achieve the modification of coarse fibers through a simple filtration method, increase the contact time between the fiber filter material and the modification solution, effectively retain heterogeneous materials, and achieve a better modification loading effect.

[0026] The fiber filter material modification method provided by this invention can regulate the rate at which the modified solution falls by limiting the flow rate of the aeration gas, thereby achieving the control of the load.

[0027] The modified fiber filter material provided by this invention can be applied in the field of electrostatic enhanced filtration. Specifically, it can be widely used in public building spaces such as hospitals and office buildings, or in clean rooms such as pharmaceutical factories and chip factories where indoor air quality requirements are high. Attached Figure Description

[0028] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0029] Figure 1 A schematic diagram of the structure of the fiber filter material modification device provided in an embodiment of the present invention;

[0030] Figure 2 This is a schematic diagram of the electrostatic enhanced filtration testing equipment in the test examples of the present invention;

[0031] Explanation of reference numerals in the attached figures:

[0032] 1. Buffer chamber; 2. Liquid collection chamber; 3. Through hole; 4. Liquid outlet section; 5. Filter plate; 6. Liquid collection bottle; 7. Air outlet; 8. Fiber filter media; 9. Filter pipe; 10. Pre-filtration test port; 11. Porous metal plate; 12. Discharge power supply; 13. Discharge needle; 14. Polarization power supply; 15. Positive electrode metal mesh; 16. Filter material; 17. Negative electrode metal mesh; 18. Post-filtration test port. Detailed Implementation

[0033] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] In the description of this invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0035] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0036] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0037] Example 1

[0038] This embodiment provides a method for modifying fiber filter media, using methods such as... Figure 1 The modification apparatus shown has the following specific modification steps and operating parameters:

[0039] The modification device used in this embodiment includes a filter funnel and a collection bottle 6 connected together. The filter funnel includes, from top to bottom, a buffer chamber 1 for buffering the modified solution, a collection chamber 2, and a liquid outlet section 4. A filter plate 5 is provided between the buffer chamber 1 and the collection chamber 2. The filter plate 5 is used to place fiber filter media 8. Several through holes 3 are opened on the side wall of the collection chamber 2. The collection bottle 6 includes an air inlet 7 for blowing in gas.

[0040] The filter plate has a pore size of 1 mm; the through holes have a pore size of 0.1 mm; and there are 50 through holes per square centimeter.

[0041] During the modification process, fiber filter material 8 is placed on filter plate 5, modified liquid is injected into buffer chamber 1, gas is blown in through air outlet 7, and modified liquid enters collection bottle 6 through collection chamber 2 and outlet section 4.

[0042] The fiber filter material is made of PET with a pore size of 1000μm; the gas introduced is air with a flow rate of 5L / min; the modified liquid contains 0.01% heterogeneous material, which is GO with a size of 5μm, and the solvent is water; the mass ratio of heterogeneous material to fiber filter material in the modified solution is 1:1.

[0043] Example 2

[0044] This embodiment provides a method for modifying fiber filter media, using methods such as... Figure 1 The modification apparatus shown has the following specific modification steps and operating parameters:

[0045] The modification device used in this embodiment includes a filter funnel and a collection bottle 6 connected together. The filter funnel includes, from top to bottom, a buffer chamber 1 for buffering the modified solution, a collection chamber 2, and a liquid outlet section 4. A filter plate 5 is provided between the buffer chamber 1 and the collection chamber 2. The filter plate 5 is used to place fiber filter media 8. Several through holes 3 are opened on the side wall of the collection chamber 2. The collection bottle 6 includes an air inlet 7 for blowing in gas.

[0046] The filter plate has a pore size of 3 mm; the through holes have a pore size of 1 mm; and there are 5 through holes per square centimeter.

[0047] During the modification process, fiber filter material 8 is placed on filter plate 5, modified liquid is injected into buffer chamber 1, gas is blown in through air outlet 7, and modified liquid enters collection bottle 6 through collection chamber 2 and outlet section 4.

[0048] The fiber filter material is made of polylactic acid with a pore size of 100 μm; the gas introduced is air with a flow rate of 50 L / min; the modified liquid contains 0.5% heterogeneous material, which is BN with a size of 1 μm, and the solvent is water; the mass ratio of heterogeneous material to fiber filter material in the modified solution is 1:10.

[0049] Example 3

[0050] This embodiment provides a method for modifying fiber filter media, using methods such as... Figure 1 The modification apparatus shown has the following specific modification steps and operating parameters:

[0051] The modification device used in this embodiment includes a filter funnel and a collection bottle 6 connected together. The filter funnel includes, from top to bottom, a buffer chamber 1 for buffering the modified solution, a collection chamber 2, and a liquid outlet section 4. A filter plate 5 is provided between the buffer chamber 1 and the collection chamber 2. The filter plate 5 is used to place fiber filter media 8. Several through holes 3 are opened on the side wall of the collection chamber 2. The collection bottle 6 includes an air inlet 7 for blowing in gas.

[0052] The filter plate has a pore size of 2 mm; the through holes have a pore size of 0.5 mm; and there are 30 through holes per square centimeter.

[0053] During the modification process, fiber filter material 8 is placed on filter plate 5, modified liquid is injected into buffer chamber 1, gas is blown in through air outlet 7, and modified liquid enters collection bottle 6 through collection chamber 2 and outlet section 4.

[0054] The fiber filter material is made of polypropylene with a pore size of 500 μm; the gas introduced is air with a flow rate of 30 L / min; the modified liquid contains 0.1% heterogeneous material, which is MoS2 with a size of 2 μm, and the solvent is water; the mass ratio of heterogeneous material to fiber filter material in the modified solution is 1:6.

[0055] Example 4

[0056] This embodiment provides a method for modifying fiber filter media, using methods such as... Figure 1 The modification apparatus shown has the following specific modification steps and operating parameters:

[0057] The modification device used in this embodiment includes a filter funnel and a collection bottle 6 connected together. The filter funnel includes, from top to bottom, a buffer chamber 1 for buffering the modified solution, a collection chamber 2, and a liquid outlet section 4. A filter plate 5 is provided between the buffer chamber 1 and the collection chamber 2. The filter plate 5 is used to place fiber filter media 8. Several through holes 3 are opened on the side wall of the collection chamber 2. The collection bottle 6 includes an air inlet 7 for blowing in gas.

[0058] The filter plate has a pore size of 2 mm; the through holes have a pore size of 0.5 mm; and there are 30 through holes per square centimeter.

[0059] During the modification process, fiber filter material 8 is placed on filter plate 5, modified liquid is injected into buffer chamber 1, gas is blown in through air outlet 7, and modified liquid enters collection bottle 6 through collection chamber 2 and outlet section 4.

[0060] The fiber filter material is made of polypropylene with a pore size of 500 μm; the gas introduced is air with a flow rate of 30 L / min; the modified liquid contains 0.2% heterogeneous material, which is BN with a size of 1 μm, and the solvent is water; the mass ratio of heterogeneous material to fiber filter material in the modified solution is 1:5.

[0061] Example 5

[0062] This embodiment provides a method for modifying fiber filter media, using methods such as... Figure 1 The modification apparatus shown has the following specific modification steps and operating parameters:

[0063] The modification device used in this embodiment includes a filter funnel and a collection bottle 6 connected together. The filter funnel includes, from top to bottom, a buffer chamber 1 for buffering the modified solution, a collection chamber 2, and a liquid outlet section 4. A filter plate 5 is provided between the buffer chamber 1 and the collection chamber 2. The filter plate 5 is used to place fiber filter media 8. Several through holes 3 are opened on the side wall of the collection chamber 2. The collection bottle 6 includes an air inlet 7 for blowing in gas.

[0064] The filter plate has a pore size of 2 mm; the through holes have a pore size of 0.5 mm; and there are 30 through holes per square centimeter.

[0065] During the modification process, fiber filter material 8 is placed on filter plate 5, modified liquid is injected into buffer chamber 1, gas is blown in through air outlet 7, and modified liquid enters collection bottle 6 through collection chamber 2 and outlet section 4.

[0066] The fiber filter material is made of glass fiber with a pore size of 100 μm; the gas introduced is air with a flow rate of 30 L / min; the modified liquid contains 0.1% heterogeneous material, which is MoS2 with a size of 2 μm, and the solvent is water; the mass ratio of heterogeneous material to fiber filter material in the modified solution is 1:5.

[0067] Comparative Example 1

[0068] This comparative example provides a method for modifying fiber filter material. Compared with Example 1, the difference is that a conventional filtration device is used, the sidewall of the liquid collection chamber does not include through holes, and air is pumped out during the modification process at a flow rate of 5 L / min.

[0069] Comparative Example 2

[0070] This comparative example provides a method for modifying fiber filter material. Compared with Example 1, the difference is that a conventional filtration device is used, the sidewall of the liquid collection chamber does not include through holes, and gravity is used for filtration during the modification process without pumping or blowing air.

[0071] Test case

[0072] The modified fiber filter media provided in each embodiment and comparative example were tested. The specific test items and test methods are as follows:

[0073] Loading capacity: The mass of the fiber filter media before and after loading is measured using an analytical balance. The mass of the fiber filter media before loading is subtracted from the mass of the fiber filter media after loading to obtain the loading capacity of the heterogeneous material.

[0074] Dielectric constant: The dielectric constant of the fiber filter material surface before and after loading heterogeneous materials was measured using a vector network analyzer (1MHz);

[0075] Filtration efficiency: using methods such as Figure 2 The electrostatic enhanced filtration testing equipment shown includes a filter pipe (19), which mainly comprises a discharge section (discharge needle 13, porous metal plate 11, and discharge power supply 12), a polarization section (positive metal mesh 15, filter material 16, negative metal mesh 17, and polarization power supply 14), and two test ports (10 before filtration and 18 after filtration). Airborne particulate matter (approximately 10,000 particles / L, particle size approximately 0.3-0.5 μm) moves from left to right with the airflow. It is charged in the discharge section and further moves to the polarization section, where it is captured by the polarized filter mesh, thus trapping the particles. The filtration efficiency is obtained by testing the number of particles before and after filtration at points 2 and 10. In the equipment shown, the target test filter material is placed at point 8, and the fan is adjusted to 1 m / s (wind speed measured by an anemometer). The discharge voltage during the test is 7 kV; the polarization voltage is 20 kV. The filtration resistance is recorded using a differential pressure gauge. The particle count before and after filtration was measured at points 2 and 10, respectively, to obtain the test efficiency.

[0076] Filtration resistance: After adjusting to the target wind speed, use a drag meter to measure the pressure difference at points 2 and 10 to obtain the filtration resistance;

[0077] The specific test results are shown in the table below.

[0078] Table 1

[0079]

[0080]

[0081] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A device for modifying fiber filter media, characterized in that, This includes a filter funnel and a collection bottle that are connected together, wherein, The filter funnel includes a buffer chamber, a collection chamber, and an outlet section from top to bottom. A filter plate is provided between the buffer chamber and the collection chamber. Several through holes are provided on the side wall of the collection chamber. The collection bottle includes an air inlet.

2. The device for modifying fiber filter media according to claim 1, characterized in that, The filter plate has a pore size of 1mm-3mm; And / or, the diameter of the through hole is 0.1 mm-1 mm; And / or, the number of through holes is 5-50 per square centimeter.

3. A method for modifying fiber filter media, characterized in that, The modified apparatus described in claim 1 or 2 is used.

4. The method for modifying fiber filter material according to claim 3, characterized in that, Includes the following steps: The fiber filter media is placed on the filter plate, the modified liquid is injected into the buffer chamber, gas is blown in through the air inlet, and the modified liquid enters the collection bottle through the collection chamber and the outlet section.

5. The method for modifying fiber filter material according to claim 4, characterized in that, The pore size of the fiber filter material is 50μm-1000 μm.

6. The method for modifying fiber filter media according to claim 4 or 5, characterized in that, The flow rate of the injected gas is 5-50 L / min.

7. The method for modifying fiber filter material according to any one of claims 4-5, characterized in that, The fiber filter material is made of any one of the following: aramid, polyethylene terephthalate, polyurethane, polytetrafluoroethylene, polyvinylidene fluoride, polyolefin, polylactic acid, and glass fiber.

8. The method for modifying fiber filter material according to claim 7, characterized in that, The content of heterogeneous materials in the modified liquid is 0.01-1%; And / or, the mass ratio of heterogeneous material to fiber filter media in the modified liquid is 1:1 to 1:

10.

9. A modified fiber filter material obtained by the modification method according to any one of claims 3-8.

10. The application of the modified fiber filter material according to claim 9 in electrostatic enhanced filtration.

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