Filtering material, preparation method thereof and novel multi-effect catalytic formaldehyde removal filter for automobile air conditioner

Abstract

The invention relates to the technical field of automobile air purification, and particularly discloses a filtering material, a preparation method of the filtering material and a novel automobile air conditioner multi-effect catalytic formaldehyde removal filter. The filtering material comprises a PET (Polyethylene Terephthalate) supporting layer, a gas filtering layer and a PP (Polypropylene) electrostatic filtering layer which are arranged in sequence, the gas filtering layer is prepared from the following raw materials in parts by weight: 30 to 90 parts of activated carbon and 10 to 70 parts of manganese catalyst. The gas filtering layer composed of the activated carbon and the manganese catalyst is matched with the filtering material composed of the PET supporting layer and the PP electrostatic filtering layer, four gases of n-butane, methylbenzene, sulfur dioxide and nitrogen dioxide can be adsorbed, the manganese catalyst degrades formaldehyde at normal temperature, meanwhile, the reaction on the formaldehyde is a catalytic reaction, and the environment-friendly effect is achieved. Therefore, the filter material disclosed by the invention also has longer service life, so that a filter made of the filter material has a better formaldehyde removal effect and longer service life.

Description

Technical Field

[0001] This application relates to the technical field of automotive air purification, and in particular to a filter material and its preparation method, as well as a novel multi-effect catalytic formaldehyde removal filter for automotive air conditioning. Background Technology

[0002] As a key component for in-vehicle air purification, the core function of the automotive air conditioning filter is to filter out impurities, dust, industrial exhaust gases, and harmful gases such as formaldehyde released from the interior of the vehicle. Current industry standards only mandate filtration efficiency for dust, n-butane, toluene, and sulfur dioxide, without specifying requirements for formaldehyde removal. Commercially available products have significant technical defects: firstly, traditional activated carbon has an adsorption capacity of only 0.1-0.3 mg / g, with a filtration efficiency of <40% at room temperature, resulting in low formaldehyde removal efficiency; secondly, the formaldehyde desorption rate exceeds 30% at 60℃, easily causing secondary pollution; and thirdly, under physical adsorption mode, the filter element's efficiency decreases by over 50% after 150 hours, resulting in a short lifespan. Therefore, there is an urgent need to develop a multi-effect filter that combines high-efficiency formaldehyde removal with a long lifespan. Summary of the Invention

[0003] In order to improve the formaldehyde removal effect and lifespan of the filter, this application provides a filter material and its preparation method, as well as a novel multi-effect catalytic formaldehyde removal filter for automotive air conditioning.

[0004] Firstly, the filter material provided in this application adopts the following technical solution: A filter material includes a PET support layer, a gas filter layer, and a PP electrostatic filter layer arranged sequentially; the raw material of the gas filter layer includes the following components by weight: 30-90 parts activated carbon and 10-70 parts manganese catalyst.

[0005] By adopting the above technical solution, using a gas filter layer composed of activated carbon and manganese catalyst, and a filter material composed of a PET support layer and a PP electrostatic filter layer, four gases, n-butane, toluene, sulfur dioxide, and nitrogen dioxide, can be adsorbed. Moreover, the manganese catalyst degrades formaldehyde at room temperature. Since the reaction with formaldehyde is a catalytic reaction, the filter material of this application also has a long service life. Therefore, the filter made from the filter material has a good formaldehyde removal effect and a long service life.

[0006] In one specific implementation scheme, the activated carbon has a particle size of 0.18-0.83 mm, a pH of 7-11, an iodine value of 900-1600 mg / g, and a specific surface area of ​​900-1800 g / m².

[0007] By adopting the above technical solutions and controlling the particle size range of activated carbon, a moderate particle size distribution can be achieved while ensuring a large specific surface area, which is conducive to improving the uniformity of activated carbon spreading on the PET support layer and improving the gas filtration efficiency. Alkaline activated carbon with a pH of 7-11 can increase the adsorption and removal capacity of acidic gases in automobile exhaust, such as sulfur dioxide and nitrogen oxides.

[0008] In one specific implementation, the manganese catalyst has a crystal structure of δ-MnO2 and contains an alkali metal, wherein the molar ratio of the alkali metal to Mn is 0.05-0.25.

[0009] In one specific implementation, the alkali metal is one or both of potassium and sodium.

[0010] By adopting the above technical solution, the doping of alkali metal elements plays a key role in the charge balance of δ-MnO2 crystal, the generation of surface active centers, and the redox properties. When the molar ratio of alkali metal to Mn is 0.05-0.25, the alkali metal can enhance the chemisorption capacity of the catalyst for formaldehyde molecules and promote the migration of surface active oxygen, thereby improving the decomposition activity of manganese catalyst for formaldehyde under room temperature conditions.

[0011] Secondly, this application provides a method for preparing a filter material, which adopts the following technical solution: A method for preparing a filter material includes the following steps: Pretreatment: Activated carbon and manganese catalyst are mixed or separately loaded into the spreading silo to obtain the material; Lamination molding: First, spray polyolefin hot melt adhesive onto the PET support layer (21), then spread the material evenly, then spray polyolefin hot melt adhesive again, cover with PP electrostatic filter layer (23), bond at 130-160℃, roll and roll to form, activated carbon and manganese catalyst form gas filter layer (22), and obtain filter material.

[0012] By adopting the above technical solution, activated carbon and manganese catalyst are first mixed or separately loaded into the spreading bin to obtain the material. Then, polyolefin hot melt adhesive is sprayed on the PET support layer, the material is evenly spread, and then adhesive is sprayed again to cover the PP electrostatic filter layer. The material is then bonded at high temperature, rolled and wound to form a filter material with good formaldehyde removal effect.

[0013] In one specific feasible implementation, the PET support layer has a basis weight of 50 g / m². 2 PET polyester nonwoven fabric; PP electrostatic filter layer with a basis weight of 70g / m 2 PP electrostatic electret cotton.

[0014] In one specific feasible implementation, during the lamination process, the spraying amount of polyolefin hot melt adhesive is 30 g / m³. 2 .

[0015] Thirdly, this application provides a novel multi-effect catalytic converter for automotive air conditioning systems, employing the following technical solution: A novel multi-effect catalytic formaldehyde removal filter for automotive air conditioning includes a frame and a filter material. The filter material is disposed within the frame and is serrated. The frame includes a first sidewall and a second sidewall disposed opposite to each other, which together form the frame. The inner sidewalls of the first sidewall and the second sidewall are both in contact with the peripheral wall of the filter material. An adhesive component is disposed between the two second sidewalls and is bonded to the filter material.

[0016] By adopting the above technical solution, the formaldehyde removal filter made of the filter material has a better formaldehyde removal effect and a longer service life. The serrated design increases the adsorption area of ​​the filter material, and the design of the rubber parts improves the bonding strength between the filter material and the frame.

[0017] In one specific implementation, the method for preparing the formaldehyde removal filter includes the following steps: PET polyester nonwoven fabric is selected as the first frame and the second frame. The filter material is folded into a serrated shape and then placed in the frame. It is fixed with polyolefin hot melt adhesive. Finally, polyolefin hot melt adhesive is sprayed on the filter material to form a glue part, and the glue part is bonded to the second frame to obtain a formaldehyde removal filter.

[0018] In summary, this application includes at least one of the following beneficial technical effects: 1. The gas filter layer composed of activated carbon and manganese catalyst in this application, combined with the filter material composed of PET support layer and PP electrostatic filter layer, can adsorb four gases: n-butane, toluene, sulfur dioxide, and nitrogen dioxide. The manganese catalyst degrades formaldehyde at room temperature. Since the reaction with formaldehyde is a catalytic reaction, the filter material of this application also has a long service life. Therefore, the filter made from the filter material has a good formaldehyde removal effect and a long service life. 2. The method in this application first mixes or separately loads activated carbon and manganese catalyst into a spreading hopper to obtain material. Then, polyolefin hot melt adhesive is sprayed onto the PET support layer, the material is evenly spread, adhesive is sprayed again, a PP electrostatic filter layer is covered, high-temperature bonding is performed, and the material is rolled and wound to form a filter material with good formaldehyde removal effect. 3. The formaldehyde removal filter in this application is made of filter material, which has a good formaldehyde removal effect and a long service life. The serrated design increases the adsorption area of ​​the filter material, and the design of the adhesive parts improves the bonding strength between the filter material and the frame. Attached Figure Description

[0019] Figure 1 This is a cross-sectional schematic diagram used in this application to illustrate the filter material in Example 1.

[0020] Figure 2 This is a schematic diagram illustrating the overall structure of the formaldehyde removal filter in Application Example 1 in this application.

[0021] Explanation of reference numerals in the attached drawings: 1. Frame; 11. First border; 12. Second border; 2. Filter material Materials; 21. PET support layer; 22. Gas filter layer; 23. PP electrostatic filter layer; 3. Adhesive parts. Detailed Implementation

[0022] The present application will be further described in detail below with reference to the embodiments.

[0023] All raw materials used in the examples are commercially available. The polyolefin hot melt adhesive was provided by Guangzhou Poseidon Materials Technology Co., Ltd.

[0024] Preparation Example Preparation Example 1 Preparation Example 1 provides a method for preparing a manganese catalyst, comprising the following steps: 15.8 g of KMnO4 was dissolved in 500 mL of water and labeled as the first solution. 322.2 g of 50 wt% manganese nitrate solution was taken and labeled as the second solution. The two solutions were added to the high-pressure reactor in parallel flow, and the stirring paddle in the high-pressure reactor was turned on at the same time. After the parallel flow was completed, the high-pressure reactor was sealed and the temperature was raised to 120 °C. The reaction was continued for 4 h. Then the heating and stirring were turned off and the aging was continued. After the aging was completed, the catalyst was washed, filtered, dried, calcined and granulated to obtain the manganese catalyst. The alkali metal in the manganese catalyst was K, and the molar ratio of K to Mn was 0.1.

[0025] Preparation Example 2 Preparation Example 2 provides a method for preparing a manganese catalyst, comprising the following steps: 15.8 g of KMnO4 was dissolved in 500 mL of water and labeled as the first solution. 107.4 g of 50 wt% manganese nitrate solution was taken and labeled as the second solution. The two solutions were added to the high-pressure reactor in parallel flow, and the stirring paddle in the high-pressure reactor was turned on at the same time. After the parallel flow was completed, the high-pressure reactor was sealed and the temperature was raised to 120 °C. The reaction was continued for 4 h. Then the heating and stirring were turned off and the aging was continued. After the aging was completed, the catalyst was washed, filtered, dried, calcined and granulated to obtain the manganese catalyst. The alkali metal in the manganese catalyst was K, and the molar ratio of K to Mn was 0.25.

[0026] Preparation Example 3 Preparation Example 3 provides a method for preparing a manganese catalyst, comprising the following steps: 15.8 g of KMnO4 was dissolved in 500 mL of water and labeled as the first solution. 680.2 g of 50 wt% manganese nitrate solution was taken and labeled as the second solution. The two solutions were added to the high-pressure reactor in parallel flow, and the stirring paddle in the high-pressure reactor was turned on at the same time. After the parallel flow was completed, the high-pressure reactor was sealed and the temperature was raised to 120 °C. The reaction was continued for 4 h. Then the heating and stirring were turned off and the aging was continued. After the aging was completed, the catalyst was washed, filtered, dried, calcined and granulated to obtain the manganese catalyst. The alkali metal in the manganese catalyst was K, and the molar ratio of K to Mn was 0.05.

[0027] Preparation Example 4 Preparation Example 4 provides a method for preparing a manganese catalyst, comprising the following steps: 14.2 g of NaMnO4 was dissolved in 500 mL of water and labeled as the first solution. 322.2 g of 50 wt% manganese nitrate solution was taken and labeled as the second solution. The two solutions were added to the high-pressure reactor in parallel flow, and the stirring paddle in the high-pressure reactor was turned on at the same time. After the parallel flow was completed, the high-pressure reactor was sealed and the temperature was raised to 120 °C. The reaction was continued for 4 h. Then the heating and stirring were turned off and the aging was continued. After the aging was completed, the catalyst was washed, filtered, dried, calcined and granulated to obtain the manganese catalyst. The alkali metal in the manganese catalyst is Na, and the molar ratio of Na to Mn is 0.1.

[0028] Preparation Example 5 Preparation Example 5 provides a method for preparing a manganese catalyst, comprising the following steps: 15.8 g of KMnO4 was dissolved in 500 mL of water and labeled as the first solution. 83.4 g of 50 wt% manganese nitrate solution was taken and labeled as the second solution. The two solutions were added to the high-pressure reactor in parallel flow, and the stirring paddle in the high-pressure reactor was turned on at the same time. After the parallel flow was completed, the high-pressure reactor was sealed and the temperature was raised to 120 °C. The reaction was continued for 4 h. Then the heating and stirring were turned off and the aging was continued. After the aging was completed, the catalyst was washed, filtered, dried, calcined and granulated to obtain the manganese catalyst. The alkali metal in the manganese catalyst was K, and the molar ratio of K to Mn was 0.3. Example

[0029] Example 1 Example 1 provides a filter material 2.

[0030] Reference Figure 1 A filter material 2 includes a PET support layer 21, a gas filter layer 22, and a PP electrostatic filter layer 23 arranged sequentially.

[0031] Example 1 also provides a method for preparing filter material 2, comprising the following steps: Pretreatment: 85 kg of activated carbon and 15 kg of manganese catalyst from Preparation Example 1 were mixed and loaded into a spreading silo to obtain the material; wherein the activated carbon had a particle size of 0.35 mm, an iodine value of 1300 mg / g, a pH of 8, and a specific surface area of ​​1300 g / m². Lamination molding: A thickness of 0.4mm and a basis weight of 50g / m³ are selected. 2 PET polyester nonwoven fabric is used as the PET support layer 21. The tensile strength of the PET polyester nonwoven fabric is ≥25N. Polyolefin hot melt adhesive is first sprayed onto the PET support layer at a spraying amount of 30g / m². 2 Next, activated carbon and the manganese catalyst from Preparation Example 1 were evenly spread, with a spreading amount of 410 g / m³. 2 Then spray polyolefin hot melt adhesive at a rate of 30g / m². 2 The PP electrostatic filter layer 23 is used as a cover. The PP electrostatic filter layer 23 has a thickness of 0.8mm and a basis weight of 70g / m³. 2 PP electrostatic electret cotton is bonded at 145℃, rolled and wound into shape, and activated carbon and manganese catalyst form a gas filter layer 22 with a thickness of 1.2mm to obtain the filter material.

[0032] Example 2 The difference between Example 2 and Example 1 is that the pretreatment is as follows: 75 kg of activated carbon and 25 kg of manganese catalyst from Example 1 are mixed and loaded into a spreading silo to obtain the material; wherein the activated carbon has a particle size of 0.35 mm, an iodine value of 1300 mg / g, a pH of 8, and a specific surface area of ​​1300 g / m²; the remaining steps are the same as in Example 1.

[0033] Example 3 The difference between Example 3 and Example 1 is that the pretreatment is as follows: 85 kg of activated carbon and 15 kg of manganese catalyst from Preparation Example 2 are mixed and loaded into a spreading silo to obtain the material; wherein the activated carbon has a particle size of 0.35 mm, an iodine value of 1300 mg / g, a pH of 8, and a specific surface area of ​​1300 g / m²; the remaining steps are the same as in Example 1.

[0034] Example 4 The difference between Example 4 and Example 1 is that the pretreatment is as follows: 85 kg of activated carbon and 15 kg of manganese catalyst from Preparation Example 3 are mixed and loaded into a spreading silo to obtain the material; wherein the activated carbon has a particle size of 0.35 mm, an iodine value of 1300 mg / g, a pH of 8, and a specific surface area of ​​1300 g / m²; the remaining steps are the same as in Example 1.

[0035] Example 5 The difference between Example 5 and Example 1 is that the pretreatment is as follows: 85 kg of activated carbon and 15 kg of manganese catalyst from Preparation Example 4 are mixed and loaded into a spreading silo to obtain the material; wherein the activated carbon has a particle size of 0.35 mm, an iodine value of 1300 mg / g, a pH of 8, and a specific surface area of ​​1300 g / m²; the remaining steps are the same as in Example 1.

[0036] Example 6 The difference between Example 6 and Example 1 is that the pretreatment is as follows: 85 kg of activated carbon and 15 kg of manganese catalyst from Preparation Example 5 are mixed and loaded into a spreading silo to obtain the material; wherein the activated carbon has a particle size of 0.35 mm, an iodine value of 1300 mg / g, a pH of 8, and a specific surface area of ​​1300 g / m²; the remaining steps are the same as in Example 1.

[0037] Example 7 The difference between Example 7 and Example 1 is that the pretreatment is as follows: 30 kg of activated carbon and 70 kg of manganese catalyst from Example 1 are mixed and loaded into a spreading silo to obtain the material; wherein the activated carbon has a particle size of 0.35 mm, an iodine value of 1300 mg / g, a pH of 8, and a specific surface area of ​​1300 g / m²; the remaining steps are the same as in Example 1.

[0038] Example 8 The difference between Example 8 and Example 1 is that the pretreatment is as follows: 90 kg of activated carbon and 10 kg of manganese catalyst from Example 1 are mixed and loaded into a spreading silo to obtain the material; wherein the activated carbon has a particle size of 0.35 mm, an iodine value of 1300 mg / g, a pH of 8, and a specific surface area of ​​1300 g / m²; the remaining steps are the same as in Example 1.

[0039] Comparative Example Comparative Example 1 The difference between Comparative Example 1 and Example 1 is that the pretreatment is as follows: 100 kg of activated carbon is loaded into the spreading hopper to obtain the material; wherein the activated carbon has a particle size of 0.35 mm, an iodine value of 1300 mg / g, a pH of 8, and a specific surface area of ​​1300 g / m²; the remaining steps are the same as in Example 1.

[0040] Comparative Example 2 The difference between Comparative Example 2 and Example 1 is that the pretreatment is as follows: 100 kg of the manganese catalyst from Preparation Example 1 is loaded into the spreading silo to obtain the material; the remaining steps are the same as in Example 1.

[0041] Application examples Application Example 1 Application Example 1 provides a novel multi-effect catalytic formaldehyde removal filter for automotive air conditioning.

[0042] Reference Figure 2 A novel multi-effect catalytic formaldehyde removal filter for automotive air conditioning includes a frame 1 and a filter material 2 as described in Example 1. The filter material 2 is disposed within the frame 1 and is serrated. The frame includes a first side frame 11 and a second side frame 12 disposed opposite to each other. The first side frame 11 and the second side frame 12 enclose the frame 1. The inner sidewalls of the first side frame 11 and the second side frame 12 are both attached to the peripheral wall of the filter material 2. An adhesive component 3 is disposed between the two second side frames 12 and is bonded to the filter material 2.

[0043] Application Example 1 Application Example 1 also provides a method for preparing a novel multi-effect catalytic converter for removing formaldehyde from automotive air conditioning systems, comprising the following steps: A thickness of 0.4 mm and a basis weight of 50 g / m² were selected. 2 PET polyester nonwoven fabric is used as the first frame 11 and the second frame 12. The filter material 2 in Example 1 is folded into a serrated shape and then placed in the frame 1. It is fixed with polyolefin hot melt adhesive. Finally, polyolefin hot melt adhesive is sprayed on the filter material 2 to form the adhesive part 3. The adhesive part 3 is bonded to the second frame 12 to obtain the formaldehyde removal filter.

[0044] Application Example 2 The difference between Application Example 2 and Application Example 1 is that the filter material 2 is the same as the filter material 2 in Example 2, while the rest of the steps are the same as in Application Example 1.

[0045] Application Example 3 The difference between Application Example 3 and Application Example 1 is that the filter material 2 is the same as the filter material 2 in Example 3, while the rest of the steps are the same as in Application Example 1.

[0046] Application Example 4 The difference between Application Example 4 and Application Example 1 is that the filter material 2 is the same as that in Application Example 4, while the rest of the steps are the same as in Application Example 1.

[0047] Application Example 5 The difference between Application Example 5 and Application Example 1 is that the filter material 2 is the same as the filter material 2 in Example 5, while the rest of the steps are the same as in Application Example 1.

[0048] Application Example 6 The difference between Application Example 6 and Application Example 1 is that the filter material 2 is the same as that in Application Example 6, while the rest of the steps are the same as in Application Example 1.

[0049] Application Example 7 The difference between Application Example 7 and Application Example 1 is that the filter material 2 is the same as the filter material 2 in Example 7, while the rest of the steps are the same as in Application Example 1.

[0050] Application Example 8 The difference between Application Example 8 and Application Example 1 is that the filter material 2 is the same as that in Application Example 8, while the rest of the steps are the same as in Application Example 1.

[0051] Comparative application examples Comparative Application Example 1 The difference between Application Example 1 and Application Example 2 is that the filter material 2 used in Comparative Example 1 is selected, while the other steps are the same as in Application Example 1.

[0052] Comparative Application Example 2 The difference between Application Example 2 and Application Example 1 is that the filter material 2 is the same as the filter material 2 in Comparative Example 2, while the rest of the steps are the same as in Application Example 1.

[0053] Compare and contrast with example 3-26 Comparative application examples 3-26 are the commercially available automotive air conditioning filters listed in Table 3.

[0054] Performance testing Dust filtration test: According to GB / T32085.1-2015 "Automotive air conditioning filters - Part 1", the A2 ash interception efficiency and A2 ash content of the formaldehyde removal filters in each application example and comparative application example were tested. The PP electrostatic filter layer in the filter material was the test contact surface.

[0055] Gas filtration test: The gas filtration performance and gas dirt holding capacity of the formaldehyde removal filters in each application example and comparative application example were tested according to GB / T32085.2-2015 "Automotive air conditioning filters Part 2". The PP electrostatic filter layer in the filter material was used as the test contact surface.

[0056] Formaldehyde efficiency and formaldehyde holding capacity testing: The experiment was conducted according to GB / T18801-2022 Air Purifiers, Appendix E: Test method for clean air delivery rate of gaseous pollutants, Appendix F: Test method for cumulative purification capacity of gaseous pollutants, to obtain formaldehyde efficiency and formaldehyde holding capacity. The larger the formaldehyde holding capacity, the longer the service life of the formaldehyde removal filter.

[0057] 10-minute formaldehyde removal rate: The formaldehyde removal rate of the car air conditioning filter in Application Example 3-26 and the formaldehyde removal filter in Application Example 1 were tested for 10 minutes. The test method was as follows: the filter or filter was installed in the air conditioning assembly of a 2021 Volkswagen Jetta, and the test airflow was 200m³ / min. 3 The formaldehyde concentration generated by the detection system was approximately 1.5 ppm per hour. The test was conducted at room temperature (23℃), relative humidity (53% RH), and normal pressure. The formaldehyde concentration was measured and recorded using a MIC2000-4-WT formaldehyde detector from Shenzhen Yiyuntian Company, and the formaldehyde removal rate after 10 minutes was calculated.

[0058] Table 1. Dust and gas detection results of the formaldehyde removal filter Table 2. Test results of formaldehyde efficiency and formaldehyde holding capacity of the formaldehyde removal filter. sample Formaldehyde efficiency (%) Formaldehyde holding capacity (mg) Application Example 1 95.5 420.95 Application Example 2 96.4 549.92 Application Example 3 76.8 217.23 Application Example 4 77.9 197.45 Application Example 5 95.3 324.69 Application Example 6 18.5 4.48 Application Example 7 98.7 1599.83 Application Example 8 90.1 115.26 Comparative Application Example 1 55.14 3.24 Comparative Application Example 2 99.1 2165.66 Table 3. Formaldehyde removal rate test results of filter elements and filters within 10 minutes. Combining Tables 1 and 2, Application Examples 1, 2, 7-8, and Comparative Application Examples 1-2, it can be seen that in Example 1, filter material 2, through an adsorption-catalysis synergistic mechanism and a reasonable mixing ratio of activated carbon and manganese catalyst, achieves efficient formaldehyde degradation at room temperature, avoiding the traditional adsorption saturation problem, and has a long service life; in addition, alkaline activated carbon simultaneously enhances the removal capacity of acidic gases, meeting the requirements of composite purification. Demand for transformation.

[0059] Based on Tables 1 and 2, and application examples 3, 4 and 6, it can be seen that when the molar ratio of alkali metal to Mn in the manganese catalyst is 0.05-0.25, the filter material has a better effect on formaldehyde treatment.

[0060] Based on Tables 1 and 2, Application Example 1 and Application Example 5, it can be seen that potassium or sodium is the preferred alkali metal in the manganese catalyst, resulting in good formaldehyde treatment effect of the filter material.

[0061] Based on Table 3, Application Example 1, and Comparative Application Example 3-26, it can be seen that the formaldehyde removal effect of the formaldehyde removal filter in this application is far superior to that of commercially available products.

[0062] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A filter material, characterized in that: It includes a PET support layer (21), a gas filter layer (22), and a PP electrostatic filter layer (23) arranged in sequence; the raw materials of the gas filter layer (22) include the following components by weight: 30-90 parts activated carbon and 10-70 parts manganese catalyst.

2. The filter material according to claim 1, characterized in that: The activated carbon has a particle size of 0.18-0.83 mm, a pH of 7-11, an iodine value of 900-1600 mg / g, and a specific surface area of ​​900-1800 g / m².

3. The filter material according to claim 1, characterized in that: The manganese catalyst has a crystal structure of δ-MnO2 and contains an alkali metal, wherein the molar ratio of the alkali metal to Mn is 0.05-0.

25.

4. The filter material according to claim 3, characterized in that: The alkali metal is one or both of potassium and sodium.

5. A method for preparing a filter material as described in any one of claims 1-4, characterized in that: Includes the following steps: Pretreatment: Activated carbon and manganese catalyst are mixed or separately loaded into the spreading silo to obtain the material; Lamination molding: First, spray polyolefin hot melt adhesive on the PET support layer (21), then spread the material evenly, then spray polyolefin hot melt adhesive again, cover the PP electrostatic filter layer (23), bond at 130-160℃, roll and roll to form, activated carbon and manganese catalyst form gas filter layer (22), and obtain filter material.

6. The method for preparing a filter material according to claim 5, characterized in that: The PET support layer (21) is a PET polyester nonwoven fabric with a basis weight of 50g / m²; the PP electrostatic filter layer (23) is a PP electrostatic electret cotton with a basis weight of 70g / m².

7. The method for preparing a filter material according to claim 5, characterized in that: In the lamination process, the amount of polyolefin hot melt adhesive sprayed is 30 g / m².

8. A novel multi-effect catalytic converter for removing formaldehyde from automotive air conditioning systems, characterized in that: The device includes a frame (1) and a filter material (2) as described in any one of claims 1-4. The filter material (2) is disposed within the frame (1) and is serrated. The frame (1) includes a first side frame (11) and a second side frame (12) disposed opposite to each other. The first side frame (11) and the second side frame (12) enclose the frame (1). The inner sidewalls of the first side frame (11) and the second side frame (12) are both attached to the peripheral wall of the filter material (2). An adhesive component (3) is disposed between the two second side frames (12) and is bonded to the filter material (2).

9. A novel multi-effect catalytic converter for removing formaldehyde from automotive air conditioning according to claim 8, characterized in that: The method for preparing the formaldehyde removal filter includes the following steps: PET polyester nonwoven fabric is selected as the first frame (11) and the second frame (12). The filter material (2) is folded into a serrated shape and then placed in the frame (1). It is fixed with polyolefin hot melt adhesive. Finally, polyolefin hot melt adhesive is sprayed on the filter material (2) to form a glue part (3). The glue part (3) is bonded to the second frame (12) to obtain a formaldehyde removal filter.

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