Novel high-precision dust-removal ultra-clean filter material with two coated surfaces

Abstract

The utility model discloses a novel high-precision dust-removing ultra-clean filter material with two coated surfaces, which improves the filtering efficiency of PM2.5 and meets the ultra-low emission standard. The novel high-precision dust removal ultra-clean filter material comprises a first film covering layer, a first fiber layer, a base cloth layer, a second fiber layer and a second film covering layer which are sequentially stacked in the airflow direction, the first film coating layer is a polytetrafluoroethylene microporous film, and the second film coating layer is a polyimide nanofiber film; the first fiber layer is made of one or more of polyphenylene sulfide, aramid fiber, polyester and glass fiber; the base cloth layer is made of one of polyphenylene sulfide, aramid fiber, polyester and glass fiber; the material of the second fiber layer is one or more of polyphenylene sulfide, aramid fiber, polyester and glass fiber; the fineness of the first fiber layer is 2.0 D, and the fineness of fibers of the second fiber layer is 1.0-1.5 D.

Description

Technical Field

[0001] The utility model relates to the technical field of dust removal filter materials, in particular to a new type of high-precision double-sided coated dust removal ultra-clean filter material. Background Art

[0002] The structure of a dust removal filter material generally includes a first fiber layer, a base fabric layer, and a second fiber layer. After dust enters the dust collector with the air flow, most of the dust will be blocked on the surface of the first fiber layer; however, due to the loose and porous three-dimensional structure inside the fiber layer, some fine dust will enter the first fiber layer and be carried by the air flow and gradually move towards the base fabric layer and the second fiber layer, and finally penetrate the dust removal filter material and be discharged into the atmosphere, resulting in the influence on the dust removal effect.

[0003] In order to improve the dust removal efficiency of the filter material, the existing filter material products use ultra-fine fibers to make the first fiber layer into a densified layer, or use a coating process to laminate a layer of polytetrafluoroethylene microporous membrane on the surface of the first fiber layer, so that the pore diameter of the first fiber layer is smaller and denser, thereby enabling more efficient filtration of dust.

[0004] The defects of the existing technology are that there are still certain pores in the densified layer made of ultra-fine fibers and the polytetrafluoroethylene microporous membrane, and fine dust cannot be completely blocked; and because the second fiber layer is usually not treated and still has a loose and porous structure, the pore diameter is much larger than that of the first fiber layer, and the blockage of fine dust in the second fiber layer is greatly reduced and it is easily carried out by the air flow. The current market has put forward higher requirements for the filtration accuracy of dust removal filter materials, and traditional filter materials can no longer fully meet the ultra-low emission standards. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a new type of high-precision double-sided coated dust removal ultra-clean filter material, solve the problems existing in the existing technology, improve the filtration efficiency of PM2.5, and meet the ultra-low emission standards.

[0006] In order to achieve the above purpose, the solution of the utility model is:

[0007] A new type of high-precision double-sided coated dust removal ultra-clean filter material, comprising a first coated layer, a first fiber layer, a base fabric layer, a second fiber layer, and a second coated layer that are sequentially laminated along the air flow direction; the first coated layer is a polytetrafluoroethylene microporous membrane, and the second coated layer is a polyimide nanofiber membrane; the material of the first fiber layer is one or more of polyphenylene sulfide, aramid, polyester, and glass fiber; the material of the base fabric layer is one of polyphenylene sulfide, aramid, polyester, and glass fiber; the material of the second fiber layer is one or more of polyphenylene sulfide, aramid, polyester, and glass fiber; the fineness of the first fiber layer is 2.0D, and the fiber of the second fiber layer is 1.0 - 1.5D.

[0008] The finished weight of the filter media is 550 - 650 g / m 2 、the thickness is 2.0 - 2.6 mm, the air permeability is 10 - 50 L / dm 2 / min, the transverse breaking strength is 1200 - 2500 N / 5 cm, and the longitudinal breaking strength is 1000 - 1500 N / 5 cm.

[0009] The first fiber layer, the base fabric layer, and the second fiber layer are reinforced by a hydroentangling process.

[0010] After adopting the above technical solution, the utility model has the following technical effects:

[0011] When the utility model laminates the first fiber layer, it makes the second fiber layer denser with smaller and denser pores, and then laminates a nanofiber membrane with better filtration performance, which can intercept the fine dust passing through the first fiber layer; the overall filter media can be thickened by 10 - 20%, and the thickened filter media extends the distance for the dust to move outwards. On the basis of the efficient surface filtration of the filter media for dust, it can further prevent the fine dust from passing through the second fiber layer and being discharged into the atmosphere, greatly improving the filtration efficiency of the fine dust, effectively blocking the emission of PM2.5, and achieving a dust removal efficiency of up to 99.9999%; this filter media can be used in combination with conventional filter media for the ultra-low emission of industrial dust, and can also be used in other air filtration fields that require ultra-low emission. Description of the Drawings

[0012] Figure 1 is a schematic structural diagram of a specific embodiment of the utility model;

[0013] Explanation of the reference numerals in the drawings:

[0014] 1 - First lamination layer; 2 - First fiber layer; 3 - Base fabric layer; 4 - Second fiber layer; 5 - Second lamination layer. Detailed Embodiments

[0015] In order to further explain the technical solution of the utility model, the following will elaborate on the utility model through specific embodiments.

[0016] Referring to Figure 1 as shown, the utility model discloses a new type of high-precision double-sided laminated dust removal ultra-clean filter media, including a first lamination layer 1, a first fiber layer 2, a base fabric layer 3, a second fiber layer 4, and a second lamination layer 5 laminated in sequence along the air flow direction;

[0017] The first lamination layer 1 is a polytetrafluoroethylene microporous membrane, and the second lamination layer 5 is a polyimide nanofiber membrane;

[0018] The material of the first fiber layer 2 is one or more of polyphenylene sulfide, aramid, polyester, and glass fiber; the material of the base fabric layer 3 is one of polyphenylene sulfide, aramid, polyester, and glass fiber; the material of the second fiber layer 4 is one or more of polyphenylene sulfide, aramid, polyester, and glass fiber (that is to say, the first fiber layer 2, the base fabric layer 3, and the second fiber layer 4 can be of the same material or can be mixed and spun from different materials);

[0019] The fineness of the first fiber layer 2 is 2.0 D, and the fiber of the second fiber layer 4 is 1.0 - 1.5 D.

[0020] Through the above solution, while laminating the first fiber layer 2, the present utility model performs an encryption treatment on the second fiber layer 4 to make it have smaller and denser pore sizes, and then laminates a nanofiber membrane with better filtration performance, which can intercept the fine dust passing through the first fiber layer 2; the overall filter material can be thickened by 10 - 20%, and the thickened filter material extends the distance for the dust to move outwards. On the basis of the efficient surface filtration of the filter material for dust, it can further prevent the fine dust from passing through the second fiber layer and being discharged into the atmosphere, greatly improving the filtration efficiency of the fine dust, effectively blocking the emission of PM2.5, and achieving a dust removal efficiency of up to 99.9999%; this filter material can be used in combination with conventional filter materials for the ultra - low emission of industrial dust, and can also be used in other air filtration fields requiring ultra - low emission.

[0021] The following shows specific embodiments of the present utility model.

[0022] In this embodiment, the first fiber layer 2 is a gradient filter material of 2.0 D polyphenylene sulfide fiber, the second fiber layer 4 is 1.0 D polyphenylene sulfide fiber, the base fabric layer 3 is a polyphenylene sulfide base fabric, a layer of polytetrafluoroethylene microporous membrane is laminated on the dust - facing surface of the filter material, and a polyimide nanofiber membrane is laminated on the other side. The finished weight of the above filter material is 550 - 650 g / m 2 , the thickness is 2.0 - 2.6 mm, the air permeability is 10 - 50 L / dm 2 / min, the transverse breaking strength is 1200 - 2500 N / 5 cm, the longitudinal breaking strength is 1000 - 1500 N / 5 cm, and the emission concentration of the VDI test of the filter material filtration performance is 0 mg / m 3 , and the dust removal efficiency reaches 100%. During filtration, most of the dust is blocked by the first lamination layer 1, and it is difficult for a small part of the fine dust to continue to move outwards after infiltrating into the filter material, and finally it is retained in the filter material.

[0023] The above - mentioned first fiber layer 2, base fabric layer 3, and second fiber layer 4 are reinforced by a hydro - entanglement process. The high - pressure and high - density water needles make the pore sizes of the fiber layers smaller and the filter material denser.

[0024] The above embodiments and drawings do not limit the product form and style of the present utility model. Any appropriate changes or modifications made by those of ordinary skill in the art shall be regarded as not departing from the patent scope of the present utility model.

Claims

1. A new type of high-precision double-sided film dust removal ultra-clean filter material, characterized by: It comprises a first coating layer, a first fiber layer, a base fabric layer, a second fiber layer and a second coating layer which are sequentially stacked along the airflow direction; The first coating layer is a polytetrafluoroethylene microporous membrane, and the second coating layer is a polyimide nanofiber membrane; The material of the first fiber layer is a blend of one or more of polyphenylene sulfide, aramid, polyester, and glass fiber; The material of the base fabric layer is one of polyphenylene sulfide, aramid, polyester, and glass fiber; The material of the second fiber layer is a blend of one or more of polyphenylene sulfide, aramid, polyester, and glass fiber; The fiber fineness of the first fiber layer is 2.0D, and the fiber fineness of the second fiber layer is 1.0-1.5D.

2. The novel high-precision double-sided film dust removal ultra-clean filter material according to claim 1 is characterized in that: The finished product weight of the filter material is 550-650g / m 2 , thickness 2.0~2.6mm, air permeability 10~50L / dm 2 / min, transverse breaking strength is 1200~2500N / 5cm, and longitudinal breaking strength is 1000~1500N / 5cm.

3. The novel high-precision double-sided film dust removal ultra-clean filter material according to claim 1 is characterized in that: The first fiber layer, the base fabric layer and the second fiber layer are reinforced by a hydroentanglement process.

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