Gradient type superfine PPS-aramid fiber high-temperature-resistant composite needled felt

Abstract

The utility model provides a gradient type superfine PPS-aramid fiber high-temperature-resistant composite needled felt which comprises a main filtering layer, a pre-filtering layer and a connecting layer, and the pre-filtering layer and the connecting layer are fixedly connected to the two side faces of the main filtering layer respectively. A first gradient sub-layer, a second gradient sub-layer and a third gradient sub-layer are fixedly connected to the side face, away from the main filtering layer, of the connecting layer in sequence, and a fourth gradient sub-layer is fixedly connected to the side face, away from the second gradient sub-layer, of the third gradient sub-layer; the proportions of PI and PTFE fibers in the first gradient layer, the second gradient layer and the third gradient layer are sequentially increased. According to the scheme, the needled felt with the main filtering layer as a main body is compounded with the fiber net which is formed by penetrating PI into PTFE to serve as base cloth according to different PI and PTFE fiber proportions, and the mode that the aramid nanofiber dispersion liquid is adopted for coating scraping and covering is adopted, so that the scheme can filter dust particles in the atmosphere in a gradient layering mode, and the purpose of improving the filtering effect is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of air purification, in particular to a gradient type ultra-fine PPS-aramid high-temperature resistant composite needle-punched felt. Background Art

[0002] Particulate matter (PM) is a major atmospheric pollutant. Currently, industrial dust emissions are primarily treated using bag filter technology. The conventional needle-punched filter material used in these systems has low filtration efficiency and a short service life. Furthermore, the needle-punched felt fibers have coarse pore sizes, ranging from several microns to tens of microns, making them less than ideal for filtering PM.

[0003] Therefore, there is a need for a needle-punched felt that can filter dust particles in the atmosphere in a gradient and layered manner and improve the filtering effect on PM series particles. Utility Model Content

[0004] (1) Technical problems solved

[0005] In view of the deficiencies in the prior art, the present invention provides a gradient ultrafine PPS-aramid high-temperature resistant composite needle-punched felt, which solves the problems raised in the above-mentioned background technology.

[0006] (2) Technical solution

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions: a gradient ultrafine PPS-aramid high temperature resistant composite needle-punched felt, characterized in that it includes a main filter layer, a pre-filter layer and a connecting layer, the pre-filter layer and the connecting layer are respectively fixedly connected to the two side surfaces of the main filter layer, the first gradient layer, the second gradient layer and the third gradient layer are fixedly connected in sequence on the side of the connecting layer away from the main filter layer, the fourth gradient layer is fixedly connected on the side of the third gradient layer away from the second gradient layer, and the proportions of PI and PTFE fibers in the first gradient layer, the second gradient layer and the third gradient layer increase in sequence.

[0008] Preferably, the first gradient layer, the second gradient layer, the third gradient layer and the fourth gradient layer all use a needle punching process to insert the PI fibers into the fiber mesh of the PTFE base fabric.

[0009] Preferably, the ratio of PI and PTFE fibers in the first gradient layer is 4:6, the ratio of PI and PTFE fibers in the second gradient layer is 5:5, the ratio of PI and PTFE fibers in the third gradient layer is 6:4, and the ratio of PI and PTFE fibers in the fourth gradient layer is 7:3.

[0010] Preferably, the ratio of PI to PTFE fibers in the main filter layer is 3:7, and the ratio of PI to PTFE fibers in the pre-filter layer is 2:8.

[0011] Preferably, the main filter layer and the fourth gradient layer are both coated and scraped with aramid nanofiber dispersion.

[0012] Preferably, the thickness of the main filter layer is 5.5 mm, and the thickness of the fourth gradient layer is 1.1 mm.

[0013] (3) Beneficial effects

[0014] The utility model provides a gradient ultrafine PPS-aramid high temperature resistant composite needle punched felt. It has the following beneficial effects:

[0015] 1. This solution achieves the purpose of improving the filtration effect by compositely inserting PI into a fiber mesh with PTFE as the base fabric in different ratios of PI and PTFE fibers on a needle-punched felt with the main filter layer as the main body, and using aramid nanofiber dispersion for coating and scraping. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic cross-sectional structural diagram of the present utility model.

[0017] In the figure: 11, main filter layer; 12, pre-filter layer; 13, connecting layer; 14, first gradient layer; 15, second gradient layer; 16, third gradient layer; 17, fourth gradient layer. DETAILED DESCRIPTION

[0018] The present invention provides a gradient ultrafine PPS-aramid high temperature resistant composite needle punched felt. Figure 1 As shown, it includes a main filter layer 11 , a pre-filter layer 12 , a connecting layer 13 , a first gradient layer 14 , a second gradient layer 15 , a third gradient layer 16 , and a fourth gradient layer 17 .

[0019] like Figure 1As shown, it includes a main filter layer 11, a pre-filter layer 12 and a connecting layer 13. The pre-filter layer 12 and the connecting layer 13 are fixedly connected to the two side surfaces of the main filter layer 11 respectively. The first gradient layer 14, the second gradient layer 15 and the third gradient layer 16 are fixedly connected in sequence on the side of the connecting layer 13 away from the main filter layer 11. The fourth gradient layer 17 is fixedly connected to the side of the third gradient layer 16 away from the second gradient layer 15. The proportions of PI and PTFE fibers in the first gradient layer 14, the second gradient layer 15 and the third gradient layer 16 decrease in sequence. The main filter layer 11, the pre-filter layer 12, the connecting layer 13, the first gradient layer 14, the second gradient layer 15, the third gradient layer 16 and the fourth gradient layer 17 all use a needle-punching process to insert PI fibers into the fiber mesh of PTFE as the base fabric.

[0020] The ratio of PI and PTFE fibers in the main filter layer 11 is 3:7; the ratio of PI and PTFE fibers in the pre-filter layer 12 is 2:8; the ratio of PI and PTFE fibers in the first gradient layer 14 is 4:6; the ratio of PI and PTFE fibers in the second gradient layer 15 is 5:5; the ratio of PI and PTFE fibers in the third gradient layer 16 is 6:4; and the ratio of PI and PTFE fibers in the fourth gradient layer 17 is 7:3.

[0021] The thickness of the main filter layer 11 is 5.5 mm, the thickness of the pre-filter layer 12 is 1.3 mm, and the thickness of the first gradient layer 14, the second gradient layer 15, the third gradient layer 16 and the fourth gradient layer 17 are all 1.1 mm.

[0022] The main filter layer 11 and the fourth gradient layer 17 are both modified by coating with aramid nanofiber dispersion. Furthermore, the filtering effect of this scheme can be improved by coating the pre-filter layer 12, the first gradient layer 14, the second gradient layer 15 and the third gradient layer 16 with aramid nanofiber dispersion.

[0023] When this scheme performs PM2.5 filtration, the dust particles (PM) in the atmosphere pass through the pre-filter layer 12, the main filter layer 11, the connecting layer 13, the first gradient layer 14, the second gradient layer 15, the third gradient layer 16 and the fourth gradient layer 17 in sequence. Since the pores of the above layers decrease in sequence, the dust particles (PM) are adsorbed on each filter layer in layers.

[0024] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A gradient ultrafine PPS-aramid high temperature resistant composite needle-punched felt, characterized by: The invention comprises a main filter layer (11), a pre-filter layer (12) and a connecting layer (13), wherein the pre-filter layer (12) and the connecting layer (13) are fixedly connected to the two side surfaces of the main filter layer (11), respectively; a first gradient layer (14), a second gradient layer (15) and a third gradient layer (16) are fixedly connected in sequence on a side of the connecting layer (13) away from the main filter layer (11); a fourth gradient layer (17) is fixedly connected on a side of the third gradient layer (16) away from the second gradient layer (15); and the proportions of PI and PTFE fibers in the first gradient layer (14), the second gradient layer (15) and the third gradient layer (16) increase in sequence.

2. The gradient ultrafine PPS-aramid high temperature resistant composite needle punched felt according to claim 1, characterized in that: The first gradient layer (14), the second gradient layer (15), the third gradient layer (16) and the fourth gradient layer (17) all use a needle punching process to insert PI fibers into a fiber mesh with PTFE as the base fabric.

3. The gradient ultrafine PPS-aramid high temperature resistant composite needle punched felt according to claim 1, characterized in that: The main filter layer (11) and the fourth gradient layer (17) are both coated and scraped using aramid nanofiber dispersion.

4. The gradient ultrafine PPS-aramid high temperature resistant composite needle felt according to claim 1, characterized in that: The thickness of the main filter layer (11) is 5.5 mm, and the thickness of the fourth gradient layer (17) is 1.1 mm.

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