High-efficiency low-resistance long-life multilayer gradient filtering material

Abstract

The utility model relates to a high-efficiency low-resistance long-service-life multilayer gradient filtering material which comprises a supporting layer, a gas adsorption layer, a fluffy layer, a filtering layer and a protective layer which are overlapped in sequence, the fiber diameter of the supporting layer is larger than or equal to the fiber diameter of the fluffy layer, and the fiber diameter of the fluffy layer is larger than or equal to the fiber diameter of the filtering layer. According to the material disclosed by the utility model, through the hierarchical design of five-layer stepped filtering efficiency, the filtering material with low resistance, high efficiency, high dust holding capacity and long service life is realized, the resistance of the filter can be reduced by lower resistance, the energy consumption of an air conditioner assembly is reduced, and the carbon emission is reduced; the particulate matter filtering efficiency is higher, and the air cleaning speed and efficiency are improved; the harmful gas adsorption and removal effect is higher, and the harm of harmful gas in automobile exhaust and air to human bodies is reduced; compared with the prior art, the air filter has the advantages of higher dust capacity, longer service time of the filter element in the air conditioner assembly, and better cleaning effect on air in unit area by the filter in the same driving mileage and replacement period.

Description

Technical Field

[0001] This utility model relates to a filter material, specifically a high-efficiency, low-resistance, long-life multi-layer gradient filter material. Background Technology

[0002] With continuous technological advancements and rising living standards, people are placing increasingly higher demands on quality of life and air quality. Factors affecting air quality primarily include particulate pollutants, volatile organic compounds (VOCs), inorganic harmful gases, photochemical smog, and vehicle exhaust, encompassing both physical particles and chemical substances. Using air filters to filter the air in residential environments or vehicle cabins is one of the most effective means of improving air quality and has been widely adopted. Filter materials, as the core component of air filters, directly affect the filter's filtration efficiency, harmful gas removal capacity, and dust holding capacity, thus influencing its overall effectiveness and lifespan.

[0003] Traditional filter materials that can adsorb harmful gases are usually three-layered. The material structure from the air inlet to the air outlet consists of a support layer, an adsorption layer, and a filter layer. However, during the air filtration process, this type of filter material is prone to the accumulation of particulate pollutants in the filter layer, which leads to increased resistance, reduced filtration efficiency, and shortened lifespan. On the other hand, the design direction of the filter layer's resistance and efficiency is contradictory, making it difficult to achieve a low-resistance and high-efficiency filtration effect.

[0004] Chinese patent CN107137978A discloses a high-efficiency, low-resistance fiber composite filter material, which consists of an activated carbon layer and a melt-blown layer laminated to both the upper and lower surfaces. While this patented filter material can effectively improve filtration efficiency through its double-layer melt-blown design, thus achieving high-efficiency filtration, the double-sided melt-blown structure leads to dust accumulation on both sides during use, resulting in a short service life. Utility Model Content

[0005] To address the shortcomings of existing filter materials, which, while achieving high air filtration efficiency, suffer from high resistance, low dust holding capacity, and short lifespan, this invention provides a high-efficiency, low-resistance, long-life multi-layer gradient filter material.

[0006] The objective of this utility model can be achieved through the following technical solutions:

[0007] A high-efficiency, low-resistance, long-life multilayer gradient filter material, comprising a support layer, a gas adsorption layer, a fluffy layer, a filter layer, and a protective layer stacked sequentially.

[0008] The fiber diameter of the support layer is greater than or equal to the fiber diameter of the fluffy layer, and the fiber diameter of the fluffy layer is greater than or equal to the fiber diameter of the filter layer.

[0009] The composite method for the fluffy layer, the filter layer, and the protective layer is either hot melt adhesive bonding or ultrasonic bonding. Considering reduced energy consumption, ease of processing, and lower emissions of volatile organic compounds from the material, ultrasonic bonding is preferred. The composite method for the support layer, the gas adsorption layer, and the bonded material is either hot melt adhesive filament bonding or adhesive powder bonding. Considering reduced energy consumption and lower emissions of volatile organic compounds from the material, hot melt adhesive filament bonding is preferred.

[0010] Support layer, used to provide stiffness to the filter material:

[0011] In this invention, the support layer is a layered structure made of polyethylene terephthalate, polypropylene, nylon, polyethylene terephthalate and polyacrylic acid resin, preferably one of needle-punched hot-rolled nonwoven fabric, long-fiber spunbond nonwoven fabric or wet papermaking nonwoven fabric.

[0012] In this invention, the fiber diameter of the support layer is 35-50 μm;

[0013] In this invention, the basis weight of the support layer is 50-90 g / m². 2 The preferred weight is 55-70 g / m³. 2 .

[0014] A gas adsorption layer is used to adsorb harmful gases.

[0015] In this invention, the gas adsorption layer is a layered structure composed of a mixture of deodorizing agents with different mesh sizes. Preferably, the gas adsorption layer is a layered structure composed of a mixture of two deodorizing agents with different mesh sizes, wherein the low-mesh deodorizing agent has a mesh size of 20-40 mesh and the high-mesh deodorizing agent has a mesh size of 40-100 mesh. The deodorizing agent includes any one or more of activated carbon, silica, porous ceramics, or modified activated carbon.

[0016] In this invention, the basis weight of the gas adsorption layer is 100-350 g / m³. 2 .

[0017] A fluffy layer is used to synergistically enhance the efficiency and dust holding capacity of the filter material:

[0018] In this invention, the fluffy layer is a layered structure made of polyethylene terephthalate or polypropylene;

[0019] In this invention, the fiber diameter of the fluffy layer is 20-35 μm;

[0020] In this invention, the basis weight of the fluffy layer is 20-40 g / m³. 2 .

[0021] The filter layer is used to improve the particulate matter capture efficiency of the filter material.

[0022] In this invention, the filter layer is a layered structure made of electrostatic electret polypropylene meltblown nonwoven fabric;

[0023] In this invention, the fiber diameter of the filter layer is 1.5-5 μm;

[0024] In this invention, the basis weight of the filter layer is 15-40 g / m³. 2 .

[0025] A protective layer is used to prevent damage to the filter layer.

[0026] In this invention, the protective layer is a layered structure made of polyethylene terephthalate or polypropylene;

[0027] In this invention, the fiber diameter of the protective layer is 10-20 μm;

[0028] In this invention, the basis weight of the protective layer is 7-20 g / m³. 2 .

[0029] Furthermore, the preparation method of the high-efficiency, low-resistance, long-life multilayer gradient filter material is as follows:

[0030] (1) Preparation of the support layer. The support layer can be made of needle-punched hot-rolled nonwoven fabric, long-fiber spunbond nonwoven fabric, or wet-laid paper nonwoven fabric. Considering the stiffness and dust holding capacity of the filter material, wet-laid paper nonwoven fabric is preferred, with a basis weight of 55-70 g / m³. 2 .

[0031] (2) The fluffy layer, filter layer, and protective layer are combined into an integrated filter media intermediate. The fluffy layer, filter layer, and protective layer are combined by hot melt adhesive or ultrasonic bonding. Considering the reduction of energy consumption, the convenience of processing, and the reduction of volatile organic compounds emitted from the material, ultrasonic bonding is preferred, and the snowflake pattern is selected.

[0032] (3) Apply adhesive evenly to the upper surface of the support layer in step (1) above, then lay the gas adsorption layer on the upper surface of the support layer sprayed with adhesive, and then apply the adhesive evenly to the upper surface of the gas adsorption layer. The adhesive can be selected as adhesive powder or hot melt adhesive filament. Considering the reduction of volatile organic compounds emitted from the material, hot melt adhesive filament composite is preferred. Considering the lower resistance, PUR hot melt adhesive is preferred.

[0033] (4) The integrated filter material intermediate of step (2) is superimposed on the upper surface of the gas adsorption layer sprayed with adhesive, and each layer is laminated by pressure roller to obtain a high-efficiency, low-resistance, long-life multi-layer gradient filter material.

[0034] Compared with the prior art, the present invention has the following advantages:

[0035] (1) This utility model provides a high-efficiency, low-resistance, long-life multi-layer gradient filter material. This material achieves low resistance, high efficiency, high dust holding capacity, and long life through a five-layer stepped filtration efficiency design. Lower resistance reduces the filter's resistance, lowers the energy consumption of the air conditioning assembly, and reduces carbon emissions; higher particulate matter filtration efficiency improves the speed and efficiency of air cleaning; higher adsorption and removal of harmful gases reduces the harm to the human body from vehicle exhaust and harmful gases in the air; higher dust holding capacity allows the filter element to be used for a longer time in the air conditioning assembly, and within the same mileage and replacement cycle, the filter has a better air cleaning effect per unit area.

[0036] (2) This utility model provides a high-efficiency, low-resistance, long-life multi-layer gradient filter material. This material is a five-layer filter material with a stepped filtration effect. The filter material implements gradient filtration according to the gap between the fibers of the constituent materials from large to small. For particles of different sizes in the air, they will be intercepted in different filter layers, reducing the concentrated accumulation of particulate pollutants and making full use of the materials of each layer to improve the service life of the material. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of the high-efficiency, low-resistance, long-life multilayer gradient filter material of the present invention;

[0038] The labels in the diagram indicate: 1-Support layer; 2-Gas adsorption layer; 3-Fluffy layer; 4-Filter layer; 5-Protective layer. Detailed Implementation

[0039] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. These embodiments are implemented based on the technical solution of the present invention, providing detailed implementation methods and specific operating procedures. However, the scope of protection of the present invention is not limited to the following embodiments.

[0040] To address the shortcomings of existing filter materials, which, while achieving high air filtration efficiency, suffer from high resistance, low dust holding capacity, and short lifespan, this embodiment provides a high-efficiency, low-resistance, long-life multi-layer gradient filter material. The specific structure is shown in [reference needed]. Figure 1 It includes a support layer 1, a gas adsorption layer 2, a fluffy layer 3, a filter layer 4 and a protective layer 5 stacked in sequence, with the outer side of the support layer 1 being the windward side;

[0041] The fiber diameter of the support layer 1 is greater than or equal to the fiber diameter of the fluffy layer 3, and the fiber diameter of the fluffy layer 3 is greater than or equal to the fiber diameter of the filter layer 4.

[0042] The composite method of the fluffy layer 3, the filter layer 4 and the protective layer 5 is hot melt adhesive composite or ultrasonic composite. Considering the reduction of energy consumption, the convenience of processing and the reduction of volatile organic compounds emitted from the material, ultrasonic composite is preferred. The composite method of the support layer 1, the gas adsorption layer 2 and the above-mentioned bonded material is hot melt adhesive filament composite or adhesive powder composite. Considering the reduction of energy consumption and volatile organic compounds emitted from the material, hot melt adhesive filament composite is preferred.

[0043] In this invention, the support layer 1 is used to achieve the stiffness of the filter material: the support layer 1 is a layered structure made of polyethylene terephthalate, polypropylene, nylon, polyethylene terephthalate and polyacrylic acid resin, preferably one of needle-punched thermally rolled nonwoven fabric, long-fiber spunbond nonwoven fabric or wet papermaking nonwoven fabric; the fiber diameter of the support layer 1 is 35-50 μm; the basis weight of the support layer 1 is 50-90 g / m³. 2 The preferred weight is 55-70 g / m³. 2 .

[0044] In this invention, the gas adsorption layer 2 is used to adsorb harmful gases. The gas adsorption layer 2 is a layered structure composed of a mixture of deodorizing agents with different mesh sizes. Preferably, the gas adsorption layer 2 is a layered structure composed of two deodorizing agents with different mesh sizes, wherein the lower mesh size deodorizing agent has a mesh size of 20-40 mesh, and the higher mesh size deodorizing agent has a mesh size of 40-100 mesh. The deodorizing agent includes any one or more of activated carbon, silica, porous ceramics, or modified activated carbon. The basis weight of the gas adsorption layer 2 is 100-350 g / m³. 2 .

[0045] In this invention, the fluffy layer 3 is used to synergistically enhance the efficiency and dust holding capacity of the filter material: the fluffy layer 3 is a layered structure made of polyethylene terephthalate or polypropylene; the fiber diameter of the fluffy layer 3 is 20-35 μm; the basis weight of the fluffy layer 3 is 20-40 g / m³. 2 .

[0046] In this invention, the filter layer 4 is used to achieve the particulate matter capture efficiency of the filter material: the filter layer 4 is a layered structure made of electrostatic electret polypropylene meltblown nonwoven fabric; the fiber diameter of the filter layer 4 is 20-40 μm; the basis weight of the filter layer 4 is 15-40 g / m³. 2 .

[0047] In this invention, the protective layer 5 is used to prevent damage to the filter layer: the protective layer 5 is a layered structure made of polyethylene terephthalate or polypropylene; the fiber diameter of the protective layer 5 is 10-20 μm; the basis weight of the protective layer 5 is 7-20 g / m³. 2 .

[0048] Furthermore, this invention also provides a method for preparing a high-efficiency, low-resistance, long-life multilayer gradient filter material:

[0049] (1) Preparation of support layer 1. Support layer 1 can be made of needle-punched hot-rolled nonwoven fabric, long-fiber spunbond nonwoven fabric, or wet papermaking nonwoven fabric. Considering the stiffness and dust holding capacity of the filter material, wet papermaking nonwoven fabric is preferred, and the basis weight is preferably 55-70 g / m³. 2 .

[0050] (2) The fluffy layer 3, filter layer 4, and protective layer 5 are combined into an integrated filter material intermediate. The fluffy layer 3, filter layer 4, and protective layer 5 are combined by hot melt adhesive or ultrasonic bonding. Considering the reduction of energy consumption, the convenience of processing, and the reduction of volatile organic compounds emitted from the material, ultrasonic bonding is preferred, and the pattern is selected as snowflake.

[0051] (3) Apply adhesive evenly to the upper surface of the support layer 1 from step (1) above, then lay the gas adsorption layer on the upper surface of the support layer 1 sprayed with adhesive, and then apply the adhesive evenly to the upper surface of the gas adsorption layer 2. The adhesive can be selected as adhesive powder or hot melt adhesive filament. Considering the reduction of volatile organic compounds emitted from the material, hot melt adhesive filament composite is preferred. Considering lower resistance, PUR hot melt adhesive is preferred.

[0052] (4) The integrated filter material intermediate of step (2) is superimposed on the upper surface of the gas adsorption layer 2 sprayed with adhesive, and each layer is laminated by pressure roller to obtain a high-efficiency, low-resistance, long-life multi-layer gradient filter material.

[0053] Example 1

[0054] The high-efficiency, low-resistance, long-life multilayer gradient filter material in this embodiment has the following specific structure: Figure 1 It includes a support layer 1, a gas adsorption layer 2, a fluffy layer 3, a filter layer 4 and a protective layer 5 stacked in sequence, with the outer side of the support layer 1 being the windward side;

[0055] in:

[0056] The support layer 1 is a layered structure of wet-process papermaking nonwoven fabric made of polyethylene terephthalate, polypropylene, and polyacrylic acid resin; the fiber diameter of the support layer 1 is 40 μm; the basis weight of the support layer 1 is 60 g / m³. 2 .

[0057] The gas adsorption layer 2 is a layered structure composed of two deodorizing agents with different mesh sizes. The lower-mesh deodorizing agent has a mesh size of 30 and a basis weight of 150 g / m³. 2 The high-mesh deodorizing agent has a mesh size of 60 and a weight of 150 g / m³. 2 Both the high-mesh and low-mesh deodorizing agents are activated carbon.

[0058] The fluffy layer 3 is a layered structure made of polyethylene terephthalate; the fiber diameter of the fluffy layer 3 is 25 μm; the basis weight of the fluffy layer 3 is 30 g / m³. 2 .

[0059] The filter layer 4 is a layered structure made of electrostatic electret polypropylene meltblown nonwoven fabric; the fiber diameter of the filter layer 4 is 2.5 μm; the basis weight of the filter layer 4 is 30 g / m³. 2 .

[0060] The protective layer 5 is a layered structure made of polypropylene; the fiber diameter of the protective layer 5 is 15 μm; the basis weight of the protective layer 5 is 10 g / m³. 2 .

[0061] The specific method for preparing the filter material in this embodiment is as follows:

[0062] (1) Preparation of support layer 1. Support layer 1 can be made of needle-punched hot-rolled nonwoven fabric, long-fiber spunbond nonwoven fabric, or wet papermaking nonwoven fabric. Considering the stiffness and dust holding capacity of the filter material, wet papermaking nonwoven fabric is preferred, and the basis weight is preferably 55-70 g / m³. 2 .

[0063] (2) The fluffy layer 3, filter layer 4, and protective layer 5 are combined into an integrated filter material intermediate. The fluffy layer 3, filter layer 4 and protective layer 5 are combined by hot melt adhesive or ultrasonic bonding. Considering the reduction of energy consumption, the convenience of processing and the reduction of volatile organic compounds emitted from the material, ultrasonic bonding is preferred, and the pattern is selected as snowflake.

[0064] (3) Apply adhesive evenly to the upper surface of the support layer 1 from step (1) above, then lay the gas adsorption layer 2 on the upper surface of the support layer 1 sprayed with adhesive, and then apply the adhesive evenly to the upper surface of the gas adsorption layer. The adhesive can be selected as adhesive powder or hot melt adhesive filament. Considering the reduction of volatile organic compounds emitted from the material, hot melt adhesive filament composite is preferred. Considering lower resistance, PUR hot melt adhesive is preferred.

[0065] (4) The integrated filter material intermediate of step (2) is superimposed on the upper surface of the gas adsorption layer 2 sprayed with adhesive, and each layer is laminated by pressure roller to obtain a high-efficiency, low-resistance, long-life multi-layer gradient filter material.

[0066] The high-efficiency, low-resistance, long-life multilayer gradient filter material obtained in this embodiment was tested, and the results are shown in Table 2. The test standards are as follows:

[0067] Fiber diameter: The fiber diameter was tested according to GB / T10685-2007 "Wool Fiber Diameter Test Method - Projection Microscopy".

[0068] Basis weight: The basis weight of nonwoven fabrics was tested in accordance with GB / T 24218.1-2009 "Textiles - Test methods for nonwoven fabrics - Part 1: Determination of mass per unit area".

[0069] Mesh count refers to the particle size or fineness of a material. Generally, it's defined as the number of openings in a 1-inch by 1-inch sieve that allows material to pass through. For example, 200 mesh means the material can pass through a sieve with 200 openings per 1-inch area. Using the Taylor system, the number of openings per inch is called the mesh number.

[0070] Pressure loss: The nonwoven fabric resistance test was conducted in accordance with GB / T 32610-2016 "Technical Specification for Daily Protective Masks" with an air volume of 32L / min.

[0071] Filtration efficiency: The non-woven fabric filtration efficiency was tested according to GB / T 32610-2016 "Technical Specification for Daily Protective Masks", using an air volume of 32L / min and 0.3um sodium chloride particles.

[0072] Dust holding capacity: The dust holding capacity of the filter material was tested in accordance with GB / T 32085.1-2015 "Automotive air conditioning filters - Part 1: Dust filtration test", with a face wind speed of 0.12 m / s, ISO A2 dust, and the termination condition being initial pressure loss +200 Pa.

[0073] Initial deodorization efficiency: The initial deodorization efficiency of the filter material was tested according to GB / T 32085.2-2015 "Automotive air conditioning filters - Part 1: Gas filtration test", with a face wind speed of 0.12 m / s, toluene as the gas used, and a test concentration of 80 ppm.

[0074] Dirt holding capacity: The dirt holding capacity of the filter material was tested in accordance with GB / T 32085.2-2015 "Automotive air conditioning filters - Part 1: Gas filtration test", with a face wind speed of 0.12 m / s, toluene as the gas used, and a test concentration of 80 ppm.

[0075] Example 2

[0076] The structure of this embodiment is the same as that of embodiment 1, except that the differences are shown in Table 1 and the experimental results are shown in Table 2.

[0077] Example 3

[0078] The structure of this embodiment is the same as that of embodiment 1, except that the differences are shown in Table 1 and the experimental results are shown in Table 2.

[0079] Example 4

[0080] The structure of this embodiment is the same as that of embodiment 1, except that the differences are shown in Table 1 and the experimental results are shown in Table 2.

[0081] Example 5

[0082] The structure of this embodiment is the same as that of embodiment 1, except that the differences are shown in Table 1 and the experimental results are shown in Table 2.

[0083] Example 6

[0084] The structure of this embodiment is the same as that of embodiment 1, except that the differences are shown in Table 1 and the experimental results are shown in Table 2.

[0085] Example 7

[0086] The structure of this embodiment is the same as that of embodiment 1, except that the differences are shown in Table 1 and the experimental results are shown in Table 2.

[0087] Example 8

[0088] The structure of this embodiment is the same as that of embodiment 1, except that the differences are shown in Table 1 and the experimental results are shown in Table 2.

[0089] Example 9

[0090] The structure of this embodiment is the same as that of embodiment 1, except that the differences are shown in Table 1 and the experimental results are shown in Table 2.

[0091] Example 10

[0092] The structure of this embodiment is the same as that of embodiment 1, except that the differences are shown in Table 1 and the experimental results are shown in Table 2.

[0093] Example 11

[0094] The structure of this embodiment is the same as that of embodiment 1, except that the differences are shown in Table 1 and the experimental results are shown in Table 2.

[0095] Comparative Example 1

[0096] The preparation method of this comparative example is basically the same as that of Example 1. The difference is that in this comparative example, the stacking order of the filter material is support layer 1, gas adsorption layer 2, protective layer 5, filter layer 4, and fluffy layer 3. The outer side of the support layer 1 is the windward side. The specific parameters are shown in Table 1, and the experimental results are shown in Table 2.

[0097] Comparative Example 2

[0098] The preparation method of this comparative example is basically the same as that of Example 1. The difference is that in this comparative example, the stacking order of the filter materials is support layer 1, gas adsorption layer 2, filter layer 4, protective layer 5, and fluffy layer 3. The outer side of the support layer 1 is the windward side. The specific parameters are shown in Table 1, and the experimental results are shown in Table 2.

[0099] Comparative Example 3

[0100] The preparation method of this comparative example is basically the same as that of Example 1. The difference is that in this comparative example, the stacking order of the filter material is fluffy layer 3, gas adsorption layer 2, fluffy layer 3, filter layer 4, and protective layer 5. The outer side of the support layer 1 is the windward side. The specific parameters are shown in Table 1, and the experimental results are shown in Table 2.

[0101] Comparative Example 4

[0102] The preparation method of this comparative example is basically the same as that of Example 1. The difference is that in this comparative example, the stacking order of the filter material is support layer 1, gas adsorption layer 2, fluffy layer 3, filter layer 4 and protective layer 5. The outer side of the support layer 1 is the windward side. The specific parameters are shown in Table 1 and the experimental results are shown in Table 2.

[0103] Comparative Example 5

[0104] The preparation method of this comparative example is basically the same as that of Example 1. The difference is that in this comparative example, the stacking order of the filter material is support layer 1, gas adsorption layer 2, fluffy layer 3, filter layer 4 and protective layer 5. The outer side of the support layer 1 is the windward side. The specific parameters are shown in Table 1 and the experimental results are shown in Table 2.

[0105] Comparative Example 6

[0106] The preparation method of this comparative example is basically the same as that of Example 1. The difference is that in this comparative example, the stacking order of the filter material is support layer 1, gas adsorption layer 2, fluffy layer 3, filter layer 4 and protective layer 5. The outer side of the support layer 1 is the windward side. The specific parameters are shown in Table 1 and the experimental results are shown in Table 2.

[0107] Comparative Example 7

[0108] The preparation method of this comparative example is basically the same as that of Example 1. The difference is that in this comparative example, the stacking order of the filter material is support layer 1, gas adsorption layer 2, filter layer 4 and protective layer 5. The outer side of the support layer 1 is the windward side. The specific parameters are shown in Table 1 and the experimental results are shown in Table 2.

[0109] Comparative Example 8

[0110] The preparation method of this comparative example is basically the same as that of Example 1. The difference is that in this comparative example, the stacking order of the filter material is support layer 1, gas adsorption layer 2, fluffy layer 3, and filter layer 4. The outer side of the support layer 1 is the windward side. The specific parameters are shown in Table 1, and the experimental results are shown in Table 2.

[0111] Table 1

[0112]

[0113]

[0114]

[0115]

[0116] Table 2

[0117]

[0118]

[0119]

[0120] Analysis of Tables 1 and 2 shows that:

[0121] The experimental results from Examples 1 and 5 show that, under the same conditions, when the filter layer remains unchanged, Example 5 achieves a better gradient by adjusting the fiber diameters of the support layer, the fluffy layer, and the protective layer, resulting in lower material resistance and greater dust holding capacity.

[0122] The experimental results of Examples 1 and 7 show that, under the same conditions, when the fluffy layer remains unchanged, even after the filtration efficiency is greatly improved, the dust holding capacity of the material in Example 7 only decreases slightly.

[0123] The experimental results from Examples 9 and 11 show that, under the same conditions, the fiber diameters of the support layer and the bulk layer in Example 11 are better matched with the fiber diameters of the process layer, resulting in a superior dust holding capacity of the material.

[0124] The experimental results of Example 1 and Comparative Example 1 show that, under the same conditions, the fluffy layer and protective layer of Comparative Example 1 were not arranged in the order of gradient filtration, resulting in increased material resistance and a sharp decrease in dust holding capacity.

[0125] The experimental results of Example 1 and Comparative Example 2 show that, under the same conditions, the fluffy layer, filter layer and protective layer of Comparative Example 2 were not arranged in the order of gradient filtration, and the resistance and dust holding capacity of the material deteriorated sharply.

[0126] The experimental results of Example 1 and Comparative Example 5 show that, under the same conditions, after the coarse deodorizing agent was removed in Comparative Example 5, not only was the toluene content of the material reduced, but the resistance of the material also increased and the dust holding capacity decreased significantly due to the disruption of the coarse and fine arrangement of the gas adsorption layer.

[0127] The experimental results of Example 1 and Comparative Example 6 show that, under the same conditions, after the fine deodorizing agent was removed in Comparative Example 6, not only did the initial toluene adsorption efficiency of the material decrease, but the dust holding capacity of the material actually decreased because the single-mesh deodorizing agent formed a relatively dense layer.

[0128] The experimental results of Example 1 and Comparative Example 7 show that, under the same conditions, after the fluffy layer of Comparative Example 7 was removed, the material had less filtration gradient buffer in the middle, which led to a sharp deterioration in the material's resistance and dust holding capacity.

[0129] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of this utility model without departing from its technical solution shall still fall within the protection scope of this utility model.

Claims

1. A high-efficiency, low-resistance, long-life multilayer gradient filter material, characterized in that, It includes a support layer (1), a gas adsorption layer (2), a fluffy layer (3), a filter layer (4), and a protective layer (5) stacked in sequence. The fiber diameter of the support layer (1) is greater than or equal to the fiber diameter of the fluffy layer (3), and the fiber diameter of the fluffy layer (3) is greater than or equal to the fiber diameter of the filter layer (4).

2. The high-efficiency, low-resistance, long-life multilayer gradient filter material according to claim 1, characterized in that, The support layer (1) is one of needle-punched hot-rolled nonwoven fabric, long-fiber spunbond nonwoven fabric or wet papermaking nonwoven fabric.

3. The high-efficiency, low-resistance, long-life multilayer gradient filter material according to claim 1, characterized in that, The basis weight of the support layer (1) is 55-70 g / m³. 2 .

4. The high-efficiency, low-resistance, long-life multilayer gradient filter material according to claim 1, characterized in that, The fluffy layer (3) satisfies at least one of the following conditions: ①The fluffy layer (3) is a layered structure made of polyethylene terephthalate or polypropylene; ①The fiber diameter of the fluffy layer (3) is 20-35 μm; ②The basis weight of the fluffy layer (3) is 20-40 g / m³. 2 .

5. The high-efficiency, low-resistance, long-life multilayer gradient filter material according to claim 1, characterized in that, The filter layer (4) satisfies at least one of the following conditions: ①The filter layer (4) is a layered structure made of electrostatic electret polypropylene meltblown nonwoven fabric; ② The fiber diameter of the filter layer (4) is 1.5-5 μm; ③ The basis weight of the filter layer (4) is 15-40 g / m 2 .

6. The high-efficiency, low-resistance, long-life multilayer gradient filter material according to claim 1, characterized in that, The protective layer (5) satisfies at least one of the following conditions: ①The protective layer (5) is a layered structure made of polyethylene terephthalate or polypropylene; ②The fiber diameter of the protective layer (5) is 10-20 μm; ③The basis weight of the protective layer (5) is 7-20 g / m 2 .

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