An air purifier filter element, its preparation method and application

Abstract

This invention discloses an air purifier filter element, its preparation method, and its application. It relates to the field of air purification technology. The aforementioned air purifier filter element comprises the following components in parts by weight: 0-40 parts of aluminosilicate-containing material; 0.1-2 parts of nano-titanium dioxide; 10-20 parts of sepiolite; 40-70 parts of modified molecular sieve; 0.1-5 parts of bentonite; and 0.1-2 parts of colorant; wherein the modified molecular sieve is hydroxyl-rich zeolite. The air purifier filter element of this invention no longer uses activated carbon as a raw material to prepare the filter element frame, but instead uses modified molecular sieve as the main raw material to prepare the filter element frame. It utilizes the hydroxyl content of the modified molecular sieve to capture formaldehyde in the air and react with a large number of amino groups to generate non-toxic and harmless amide substances, solving the problem of formaldehyde adsorption and desorption in existing activated carbon filter elements, thus achieving technological progress.

Description

Technical Field

[0001] This invention relates to the field of air purification technology, and in particular to an air purifier filter element, its preparation method, and its application. Background Technology

[0002] As society continues to develop, people are paying more and more attention to their health. Indoor air, which is closely related to our lives, is inevitably linked to our health, making the demand for healthy and fresh air urgent. Currently, most air purifiers use activated carbon filters combined with multi-layer high-efficiency filters to filter gases, effectively removing PM2.5 and some odors from the air. However, activated carbon filters only have an adsorption effect, and the internal pores of activated carbon are mostly semi-porous and microporous. While they can filter large particles, small molecules such as formaldehyde (radius 0.45nm) can escape through the pores, rendering them ineffective for filtration.

[0003] Filter cartridges only perform adsorption and filtration. After a period of use, the adsorption capacity of the filter cartridge reaches saturation, at which point the filter's effectiveness significantly decreases or even becomes ineffective. Existing filter cartridges are difficult to reuse and it's hard to determine if they have already failed, leading to situations where filters may have already expired but haven't been replaced in time, or filters that are still effective are replaced prematurely. Therefore, how to enable filter cartridges to remove small molecules such as formaldehyde, and how to easily determine whether the filter is still effective after a period of use, have become urgent problems to be solved. Summary of the Invention

[0004] The first technical problem to be solved by this invention is:

[0005] An air purifier filter element is provided.

[0006] The second technical problem to be solved by this invention is:

[0007] A method for preparing the air purifier filter element is provided.

[0008] The third technical problem to be solved by this invention is:

[0009] Application of the air purifier filter element.

[0010] To solve the first technical problem, the technical solution adopted by the present invention is as follows:

[0011] An air purifier filter element comprises the following components in parts by weight:

[0012] 0-40 parts of aluminosilicate-containing substances;

[0013] 0.1-2 parts nano titanium dioxide;

[0014] 10-20 parts sepiolite;

[0015] 40-70 parts modified molecular sieve;

[0016] 0.1-5 parts bentonite;

[0017] 0.1-2 parts colorant;

[0018] The modified molecular sieve is a hydroxyl-rich zeolite.

[0019] According to embodiments of the present invention, one of the technical solutions has at least one of the following advantages or beneficial effects:

[0020] 1. The air purifier filter of the present invention no longer uses activated carbon as the raw material to prepare the filter frame. Instead, it uses modified molecular sieve as the main raw material to prepare the filter frame. The modified molecular sieve is rich in hydroxyl groups to capture formaldehyde in the air and reacts with a large number of amino groups to generate amide-like non-toxic and harmless substances. This solves the problem of formaldehyde adsorption and desorption in the existing activated carbon filter, and achieves technological progress.

[0021] 2. The air purifier filter of this invention uses a modified molecular sieve as a white substrate, and the colorant can display different colors on the filter. Because formaldehyde has reducing properties, it can react with the unsaturated double-bond chromophores or oxidants in the colorant, causing a color change. After the filter has been used for a period of time, once all the amino groups it carries have formed amides, the adsorbed formaldehyde reacts with the colorant, causing a color change. This allows consumers to clearly understand whether the air purifier filter needs to be replaced. This effectively solves the current industry problem where black activated carbon filters need to be replaced after adsorption reaches saturation, but consumers cannot determine when to replace them.

[0022] 3. This filter element can be made in various colors, has excellent formaldehyde removal performance, is more aesthetically pleasing than black activated carbon filter elements, and has a simple overall production process with low production cost and energy consumption.

[0023] According to one embodiment of the present invention, the air purifier filter element comprises the following components in parts by weight:

[0024] 25-30 parts of aluminosilicate-containing substances;

[0025] 0.1-2 parts nano titanium dioxide;

[0026] 15-20 parts sepiolite;

[0027] 48.9-58.9 parts modified molecular sieve;

[0028] 0.5-5 parts bentonite;

[0029] 0.5-2 parts colorant.

[0030] According to one embodiment of the present invention, the nano-titanium dioxide includes at least one of rutile titanium dioxide and anatase titanium dioxide.

[0031] According to one embodiment of the present invention, the nano-titanium dioxide has a mesh size of 1000-1200 and a specific surface area of ​​600-800 m². 2 / g.

[0032] According to one embodiment of the present invention, the mass percentage of magnesium oxide in the sepiolite is 20-25%.

[0033] According to one embodiment of the present invention, the sepiolite comprises white sepiolite.

[0034] According to one embodiment of the present invention, the bentonite includes sodium-based bentonite.

[0035] According to one embodiment of the present invention, the colorant includes at least one of potassium permanganate and a natural pigment. Potassium permanganate is a strong oxidizing agent, and the chromophore of the natural pigment is an unsaturated double bond, enabling them to act as colorants to induce a color reaction in formaldehyde.

[0036] To solve the second technical problem, the technical solution adopted by the present invention is as follows:

[0037] A method for preparing the air purifier filter element includes the following steps:

[0038] The air purifier filter element is obtained by mixing aluminosilicate-containing substances, nano-titanium dioxide, sepiolite, modified molecular sieve, bentonite, and colorant.

[0039] According to one embodiment of the present invention, a method for preparing the air purifier filter element includes the following steps:

[0040] Mix aluminosilicate-containing materials, nano-titanium dioxide, sepiolite, modified molecular sieves, bentonite, and solvent. Stir evenly in a mixer at medium speed to form a paste. Pour the paste into a vacuum pumice machine with a vacuum degree of 0.5-1 MPa and pumice 3-5 times. Let it age for 5-7 days. Add colorant and pumice again under vacuum. Place the pumice segments into molds and press them into shape. After demolding, dry at low temperature for 24-48 hours.

[0041] According to one embodiment of the present invention, the preparation method of the modified molecular sieve includes the following steps: baking zeolite molecules in a protective atmosphere for 2 hours, cooling, mixing zeolite, aldehyde removal reagent and solvent, heating in a water bath to 50-60°C, adding dilute sulfuric acid dropwise, and drying to obtain the modified molecular sieve.

[0042] According to one embodiment of the present invention, the preparation method of the modified molecular sieve includes the following steps: baking zeolite molecules in a nitrogen-protected furnace at 600-800℃ for 2-4 hours, cooling to room temperature, mixing and dissolving aldehyde removal reagent, water, and alcohol in a ratio of 1-2:8-10:1, adding the zeolite molecular sieve to the solution and stirring evenly, heating in a water bath to 50-60℃, adding a small amount of dilute sulfuric acid, maintaining the temperature for 12-18 hours, discharging the material, drying it at low temperature to powder, sieving, and selecting particles with a diameter of 0.1-20μm.

[0043] According to one embodiment of the present invention, the formaldehyde removal agent includes at least one of ammonium citrate, 2-imidazolium ketone, and tea polyphenols. The formaldehyde removal agent can react with formaldehyde to generate a non-toxic and harmless substance.

[0044] Another aspect of the present invention relates to the application of the air purifier filter element in an air conditioner. This includes the air purifier filter element as described in the first aspect embodiment above. Since this application employs all the technical solutions of the aforementioned air purifier filter element, it possesses at least all the beneficial effects brought about by the technical solutions of the above embodiments.

[0045] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. Detailed Implementation

[0046] The embodiments of the present invention are described in detail below. Throughout the embodiments, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions. The embodiments described below are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0047] In the description of this invention, the use of terms such as "first," "second," etc., is for the purpose of distinguishing technical features only and should not be construed as indicating or implying relative importance, or implicitly indicating the number of technical features indicated, or implicitly indicating the order of the technical features indicated.

[0048] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of the present invention.

[0049] Unless otherwise specified, the reagents, methods and equipment used in this invention are all conventional reagents, methods and equipment in this technical field.

[0050] The membranes used in the embodiments are all honeycomb-shaped membranes with a size of 20*20*4cm.

[0051] Example 1

[0052] An air purifier filter element comprises the following components in parts by weight:

[0053] 35 parts aluminosilicate;

[0054] 0.1 parts nano titanium dioxide;

[0055] 15 parts meerschaum;

[0056] 48.9 parts of modified molecular sieve;

[0057] 0.5 parts bentonite;

[0058] 0.5 parts chlorophyll.

[0059] The modified molecular sieves were prepared using the following method: zeolite molecules were baked in a nitrogen-protected furnace at 600℃ for 2 hours and cooled to room temperature. The aldehyde removal component, water, and alcohol were mixed in a ratio of 1:8:1 and stirred until dissolved. The zeolite molecular sieves were added to the solution and stirred until dissolved. The solution was heated to 50℃ in a water bath and a small amount of dilute sulfuric acid was added dropwise. The solution was kept at a constant temperature for 12 hours, discharged, dried at low temperature to powder, and sieved to select particles with a diameter of 0.1-20μm.

[0060] A method for preparing an air purifier filter element includes the following steps:

[0061] Aluminosilicate, titanium dioxide, sepiolite, modified molecules, sieved bentonite, and water are mixed in proportion and stirred evenly in a mixer at medium speed to form a paste. The paste is then poured into a vacuum slurry mill with a vacuum degree of 0.5 MPa and slurryed three times. After aging for 7 days, chlorophyll is added and the paste is slurryed again under vacuum. The paste segments are placed in a mold and extruded into shape using a press. After demolding, the paste is dried at low temperature for 48 hours to obtain an air purifier filter element.

[0062] Example 2

[0063] An air purifier filter element comprises the following components in parts by weight:

[0064] 30 parts aluminosilicate;

[0065] 0.1 parts nano titanium dioxide;

[0066] 15 parts meerschaum;

[0067] 53.9 parts of modified molecular sieves;

[0068] 0.5 parts bentonite;

[0069] 0.5 parts chlorophyll.

[0070] The modified molecular sieves were prepared using the following method: zeolite molecules were baked in a nitrogen-protected furnace at 600℃ for 2 hours and cooled to room temperature. The aldehyde removal component, water, and alcohol were mixed in a ratio of 1:8:1 and stirred until dissolved. The zeolite molecular sieves were added to the solution and stirred until dissolved. The solution was heated to 50℃ in a water bath and a small amount of dilute sulfuric acid was added dropwise. The solution was kept at a constant temperature for 12 hours, discharged, dried at low temperature to powder, and sieved to select particles with a diameter of 0.1-20μm.

[0071] A method for preparing an air purifier filter element includes the following steps:

[0072] Aluminosilicate, titanium dioxide, sepiolite, modified molecules, sieved bentonite, and water are mixed in proportion and stirred evenly in a mixer at medium speed to form a paste. The paste is then poured into a vacuum slurry mill with a vacuum degree of 0.5 MPa and slurryed three times. After aging for 7 days, chlorophyll is added and the paste is slurryed again under vacuum. The paste segments are placed in a mold and extruded into shape using a press. After demolding, the paste is dried at low temperature for 48 hours to obtain an air purifier filter element.

[0073] Example 3

[0074] An air purifier filter element comprises the following components in parts by weight:

[0075] 25 parts aluminosilicate;

[0076] 0.1 parts nano titanium dioxide;

[0077] 15 parts meerschaum;

[0078] 58.9 parts of modified molecular sieves;

[0079] 0.5 parts bentonite;

[0080] 0.5 parts chlorophyll.

[0081] The modified molecular sieves were prepared using the following method: zeolite molecules were baked in a nitrogen-protected furnace at 600℃ for 2 hours and cooled to room temperature. The aldehyde removal component, water, and alcohol were mixed in a ratio of 1:8:1 and stirred until dissolved. The zeolite molecular sieves were added to the solution and stirred until dissolved. The solution was heated to 50℃ in a water bath and a small amount of dilute sulfuric acid was added dropwise. The solution was kept at a constant temperature for 12 hours, discharged, dried at low temperature to powder, and sieved to select particles with a diameter of 0.1-20μm.

[0082] A method for preparing an air purifier filter element includes the following steps:

[0083] Aluminosilicate, titanium dioxide, sepiolite, modified molecules, sieved bentonite, and water are mixed in proportion and stirred evenly in a mixer at medium speed to form a paste. The paste is then poured into a vacuum slurry mill with a vacuum degree of 0.5 MPa and slurryed three times. After aging for 7 days, chlorophyll is added and the paste is slurryed again under vacuum. The paste segments are placed in a mold and extruded into shape using a press. After demolding, the paste is dried at low temperature for 48 hours to obtain an air purifier filter element.

[0084] Example 4

[0085] An air purifier filter element comprises the following components in parts by weight:

[0086] 30 parts aluminosilicate;

[0087] 0.1 parts nano titanium dioxide;

[0088] 15 parts meerschaum;

[0089] 53.9 parts of modified molecular sieves;

[0090] 0.5 parts bentonite;

[0091] 0.5 parts potassium permanganate.

[0092] The modified molecular sieves were prepared using the following method: zeolite molecules were baked in a nitrogen-protected furnace at 600℃ for 2 hours and cooled to room temperature. The aldehyde removal component, water, and alcohol were mixed in a ratio of 1:8:1 and stirred until dissolved. The zeolite molecular sieves were added to the solution and stirred until dissolved. The solution was heated to 50℃ in a water bath and a small amount of dilute sulfuric acid was added dropwise. The solution was kept at a constant temperature for 12 hours, discharged, dried at low temperature to powder, and sieved to select particles with a diameter of 0.1-20μm.

[0093] A method for preparing an air purifier filter element includes the following steps:

[0094] Aluminosilicate, titanium dioxide, sepiolite, modified molecules, sieved bentonite, and water are mixed in proportion and stirred evenly in a mixer at medium speed to form a paste. The paste is then poured into a vacuum slurry mill with a vacuum degree of 0.5 MPa and slurryed three times. After aging for 7 days, potassium permanganate is added and vacuum slurry is slurryed again. The paste segments are placed in a mold and extruded into shape using a press. After demolding, the paste is dried at low temperature for 48 hours to obtain an air purifier filter element.

[0095] Example 5

[0096] An air purifier filter element comprises the following components in parts by weight:

[0097] 30 parts aluminosilicate;

[0098] 0.1 parts nano titanium dioxide;

[0099] 15 parts meerschaum;

[0100] 53.9 parts of modified molecular sieves;

[0101] 0.5 parts bentonite;

[0102] 0.5 parts curcumin.

[0103] The modified molecular sieves were prepared using the following method: zeolite molecules were baked in a nitrogen-protected furnace at 600℃ for 2 hours and cooled to room temperature. The aldehyde removal component, water, and alcohol were mixed in a ratio of 1:8:1 and stirred until dissolved. The zeolite molecular sieves were added to the solution and stirred until dissolved. The solution was heated to 50℃ in a water bath and a small amount of dilute sulfuric acid was added dropwise. The solution was kept at a constant temperature for 12 hours, discharged, dried at low temperature to powder, and sieved to select particles with a diameter of 0.1-20μm.

[0104] A method for preparing an air purifier filter element includes the following steps:

[0105] Aluminosilicate, titanium dioxide, sepiolite, modified molecules, sieved bentonite, and water are mixed in proportion and stirred evenly in a mixer at medium speed to form a paste. The paste is then poured into a vacuum slurry mill with a vacuum degree of 0.5 MPa and slurryed three times. After aging for 7 days, curcumin is added and vacuum slurry is slurryed again. The paste segments are placed in a mold and extruded into shape using a press. After demolding, the paste is dried at low temperature for 48 hours to obtain an air purifier filter element.

[0106] Performance testing:

[0107] The air purifier filter elements prepared in Examples 1-5 were alternately placed in the air purifier along with existing ordinary activated carbon filter elements. To eliminate interference, primary filter cotton and high-efficiency filter were not used in combination. (The last sentence appears to be incomplete and possibly refers to a specific process or setup.) 3 The test was conducted in an experimental chamber. First, the test was performed according to the national standard GB / T15516-1995, with the initial concentration value being A1, naturally decreasing to A2, and then purified by an air purifier and filter, resulting in a value of B. The purification rate was calculated as W1 = (A1 - A2 - B) / (A1 - A2) * 100%. After measuring value B, the air purifier and filter were placed in a clean 1.5m... 3 In the experimental chamber, the filter desorption value C was tested, and the desorption rate W2 was calculated as W2 = C / (A1-A2-B)*100%. Additionally, the filters from Examples 1 to 5 were installed in five air purifiers of the same model, and, to eliminate interference, primary filter cotton and high-efficiency filter screens were used interchangeably. The filters were then tested at a depth of 1.5m. 3 The experiment was conducted in a test chamber, with 3 microliters of formaldehyde liquid injected into the chamber every 24 hours to test the color change time of the filter element. The results are shown in Table 1:

[0108] Table 1

[0109]

[0110] As shown in the table above, Example 3 had the highest purification rate, but its structural strength was weaker due to the lower amount of adhesive. Examples 1-3 showed more significant color changes, and these color changes generally coincided with the time it took for the formaldehyde removal performance to be lost.

[0111] The above are merely embodiments of the present invention and do not limit the patent scope of the present invention. Any equivalent modifications made based on the content of the present invention specification, or direct or indirect applications in related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. An air purifier filter element, characterized in that: The components include the following parts by weight: 0-40 parts of aluminosilicate-containing material; wherein the content of the aluminosilicate-containing material does not include 0; 0.1-2 parts nano titanium dioxide; 10-20 parts sepiolite; 40-70 parts modified molecular sieve; 0.1-5 parts bentonite; 0.1-2 parts of colorant, wherein the colorant is potassium permanganate or natural pigment; The chromophore of the natural pigment is an unsaturated double bond; The modified molecular sieve is a hydroxyl-rich zeolite; The preparation method of the modified molecular sieve includes the following steps: baking zeolite molecules in a protective atmosphere for 2 hours, cooling, mixing zeolite, aldehyde removal reagent and solvent, heating in a water bath to 50~60℃ and then adding dilute sulfuric acid, and drying to obtain the modified molecular sieve. The formaldehyde removal agent includes at least one of ammonium citrate, 2-imidazolidineone, and tea polyphenols; The method for preparing the air purifier filter element includes the following steps: Mix aluminosilicate-containing materials, nano-titanium dioxide, sepiolite, modified molecular sieve, bentonite and solvent, and stir evenly in a mixer at medium speed to form a paste. Then pour it into a vacuum pumice machine with a vacuum degree of 0.5~1MPa and pumice 3~5 times. After aging for 5~7 days, add colorant and pumice again under vacuum. Place the pumice segments into molds and press them into shape. After demolding, dry at low temperature for 24~48 hours.

2. An air purifier filter element according to claim 1, characterized in that: The air purifier filter element comprises the following components in parts by weight: 25-35 parts of aluminosilicate-containing substances; 0.1-2 parts nano titanium dioxide; 15-20 parts sepiolite; 45-60 parts of modified molecular sieve; 0.5-2 parts bentonite; 0.5-2 parts colorant.

3. An air purifier filter element according to claim 1, characterized in that: The aluminosilicate-containing material includes at least one of clay, diatomaceous earth, and attapulgite.

4. An air purifier filter element according to claim 1, characterized in that: The nano-titanium dioxide includes at least one of rutile titanium dioxide and anatase titanium dioxide.

5. An air purifier filter element according to claim 1, characterized in that: The mass percentage of magnesium oxide in the sepiolite is 20-25%.

6. An air purifier filter element according to claim 1, characterized in that: The bentonite includes sodium-based bentonite.

7. A method for preparing an air purifier filter element as described in any one of claims 1 to 6, characterized in that: It includes the following steps: Mix aluminosilicate-containing materials, nano-titanium dioxide, sepiolite, modified molecular sieve, bentonite and solvent, and stir evenly in a mixer at medium speed to form a paste. Then pour it into a vacuum pumice machine with a vacuum degree of 0.5~1MPa and pumice 3~5 times. After aging for 5~7 days, add colorant and pumice again under vacuum. Place the pumice segments into molds and press them into shape. After demolding, dry at low temperature for 24~48 hours.

8. The application of an air purifier filter element as described in any one of claims 1 to 6 in an air conditioner.

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