An indoor air purification wallboard based on negative ion release and a preparation method thereof

Abstract

This invention discloses an indoor air-purifying wall panel based on negative ion release and its preparation method, relating to the field of wall panel coating technology. The method includes the following steps: Step 1: Adding composite filler to deionized water, adding dispersant and wetting agent, dispersing at high speed, and grinding to obtain a composite filler aqueous slurry; Step 2: Blending low-viscosity polyurethane acrylate, high-viscosity polyurethane acrylate, composite filler aqueous slurry, and trimethylolpropane ethoxylate triacrylate, adding photoinitiator, leveling agent, and defoamer, and adding deionized water to adjust the solid content to obtain a negative ion-releasing coating; Step 3: Applying the negative ion-releasing coating to the surface of the wall panel, UV curing, heat drying, and cooling to obtain the indoor air-purifying wall panel. The indoor air-purifying wall panel prepared by this application has good formaldehyde adsorption performance and high scratch resistance, meeting the usage requirements of indoor air-purifying wall panels.

Description

Technical Field

[0001] This invention relates to the field of wall panel coating technology, specifically to an indoor air purification wall panel based on negative ion release and its preparation method. Background Technology

[0002] People's demands for indoor air quality are gradually increasing, especially regarding formaldehyde pollution after indoor decoration, which has a long release period and poses a significant threat to human health. Therefore, research has begun on materials for indoor air purification, among which wall panels, with their large surface area and direct contact with air, have become an ideal carrier.

[0003] In existing technologies, achieving formaldehyde purification functionality in wall panels primarily relies on coating their surfaces with functional paints. However, in practical use, the adsorption capacity of these paints for formaldehyde is generally limited. Furthermore, due to the poor compatibility between inorganic fillers and organic resins, wiping can cause damage to the wall surface or even the shedding of filler powder, significantly impacting their performance and lifespan.

[0004] In summary, the development of an indoor air-purifying wall panel based on negative ion release and its preparation method are of great significance in addressing the aforementioned issues. Summary of the Invention

[0005] The purpose of this invention is to provide an indoor air purification wall panel based on negative ion release and its preparation method, so as to solve the problems mentioned in the background art.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: A method for preparing an indoor air-purifying wall panel based on negative ion release includes the following steps: Step 1: Add the composite filler to deionized water, add dispersant and wetting agent, disperse at high speed, and grind to obtain composite filler water slurry; Step 2: Blend low-viscosity polyurethane acrylate, high-viscosity polyurethane acrylate, composite filler water-based slurry, and trimethylolpropane ethoxy acrylate. Add photoinitiator, leveling agent, and defoamer. Add deionized water to adjust the solid content to obtain negative ion releasing coating. Step 3: Apply negative ion releasing coating to the surface of the wall panel, UV cure, heat dry, and cool to obtain indoor air purifying wall panel; The composite filler is composed of alkenyl-modified composite montmorillonite and acrylate silane-modified tourmaline.

[0007] In a further embodiment, the coating amount of the negative ion releasing coating is 150g / m² to 450g / m².

[0008] In a more optimized manner, the composite filler includes an alkenyl-modified composite montmorillonite and an acrylate silane-modified tourmaline in a mass ratio of (3~4):(1~1.8).

[0009] A more optimized method for preparing the alkenyl-modified composite montmorillonite is as follows: Step 1: Add sodium-based montmorillonite and amino-based polyethylene glycol mercapto to deionized water and stir at room temperature for 8-12 hours to obtain intercalated montmorillonite; Step 2: Add intercalated montmorillonite and epoxy silane modified titanium dioxide to deionized water, react at 60~80℃ for 2~4h, filter and dry to obtain composite montmorillonite; Step 3: Add the composite montmorillonite, ethyl isocyanate acrylate, and organotin catalyst sequentially to anhydrous toluene, set the temperature to 40~60℃, stir for 1~2 hours, filter and dry to obtain alkenyl-modified composite montmorillonite.

[0010] In a more optimized manner, the mass ratio of sodium-based montmorillonite to amino-polyethylene glycol thiosulfate in the intercalated montmorillonite is (85~95):(5~12), and the molecular weight of amino-polyethylene glycol thiosulfate is 400~1000.

[0011] In a more optimized manner, the mass ratio of intercalated montmorillonite to epoxy silane-modified titanium dioxide in the composite montmorillonite is (2~6):1; In the alkenyl-modified composite montmorillonite, the mass ratio of composite montmorillonite, ethyl isocyanate acrylate, and organotin catalyst is (1~3):1:(0.02~0.05).

[0012] More preferably, the particle size of the sodium-based montmorillonite is 1000-1500 mesh; the average particle size of the titanium dioxide in the epoxy silane-modified titanium dioxide is 10-30 nm; and the average particle size of the tourmaline in the acrylate silane-modified tourmaline is 500-1000 nm.

[0013] In a more optimized manner, the solid content of the negative ion releasing coating is 30-40%; the raw materials of the negative ion releasing coating include the following components, by mass parts: 5-15 parts low viscosity polyurethane acrylate, 25-35 parts high viscosity polyurethane acrylate, 15-25 parts composite filler water-based slurry, 2-5 parts triethanolamine propane ethoxylate triacrylate, 1-3 parts photoinitiator, 0.5-2 parts leveling agent, and 0.5-2 parts defoamer; In the composite filler aqueous slurry, the mass ratio of composite filler, deionized water, dispersant, and wetting agent is (65~75):100:(2~3):(2~3).

[0014] Ideally, the viscosity of the low-viscosity polyurethane acrylate is 300~800 cps at 25°C, and the viscosity of the high-viscosity polyurethane acrylate is 5000~10000 cps at 25°C.

[0015] The UV curing process parameters are optimized as follows: UV lamp power 400~600mJ / cm². 2 The drying time is 10-40 minutes; the process parameters for the heat drying are: temperature 60-90℃, time 1-2 hours.

[0016] An indoor air purification wall panel prepared by a method for preparing an indoor air purification wall panel based on negative ion release.

[0017] Compared with the prior art, the beneficial effects achieved by the present invention are: by designing composite fillers with specific structures and sizes, this application improves the formaldehyde adsorption efficiency and scratch resistance, and meets the usage requirements of indoor air purification wall panels.

[0018] The composite filler is composed of alkenyl-modified composite montmorillonite and acrylate silane-modified tourmaline with a specific mass ratio and specific size structure.

[0019] (1) First, montmorillonite itself can regulate humidity and adsorb a small amount of polar molecules, serving as an adsorption carrier. By intercalating montmorillonite with amino polyethylene glycol thiol groups of a specific molecular weight, on the one hand, hydrogen bonds are formed between the ether oxygen chain and formaldehyde, thereby improving the selective adsorption of formaldehyde. On the other hand, an appropriate amount of polyethylene glycol segments can expand the interlayer spacing of montmorillonite, which not only improves its own adsorption capacity but also provides space for subsequent loading of catalytic components. It should be noted that the molecular weight and the amount of amino polyethylene glycol thiol groups introduced need to be controlled within a reasonable range. If the molecular weight is too large, long chains will entangle and accumulate in the interlayer, blocking adsorption sites and reducing the effective specific surface area.

[0020] Secondly, titanium dioxide is introduced into the surface and interlayer of the intercalated montmorillonite through chemical bonds, making it highly dispersed and less prone to aggregation. The two work synergistically: montmorillonite preferentially adsorbs and enriches formaldehyde molecules around its supported titanium dioxide particles, locally increasing the reactant concentration and thus improving photocatalytic efficiency. Under light irradiation, titanium dioxide generates active groups such as hydroxyl radicals, decomposing formaldehyde into harmless products. It is important to note that the loading amount and particle size of titanium dioxide must be controlled; excessive loading or excessively large particles can lead to particle aggregation, which in turn reduces the overall adsorption and mass transfer efficiency.

[0021] Finally, the electric field of acrylate silane-modified tourmaline is used to promote the electron transport process and release negative ions. After decomposition, some sites of montmorillonite become vacant, thereby further improving the formaldehyde adsorption efficiency.

[0022] (2) This solution controls specific dimensions and structures (montmorillonite as micron-sized sheets, titanium dioxide as nanoparticles, and tourmaline as submicron-sized particles) to ensure that the fillers are uniformly dispersed in the coating, avoiding surface roughness and stress concentration points caused by excessive particle size or agglomeration, and forming a physically dense interface; and through the reactive groups on the surface of the composite filler, copolymerization with polyurethane acrylate of a specific viscosity is carried out during the UV curing process to form a tight three-dimensional network; thus synergistically improving the scratch resistance.

[0023] (3) In the scheme, high and low viscosity polyurethane acrylates are used as the matrix. High viscosity polyurethane acrylates usually have a large molecular weight and a certain degree of elasticity, which provides good film-forming properties and toughness after curing. Low viscosity polyurethane acrylates have a smaller molecular weight and lower viscosity, which plays a role in dilution and promoting flow, promoting the dispersion of fillers and improving interfacial bonding. Thus, by limiting the ratio of the two, the viscosity can be effectively adjusted, and good filler wetting and dispersion can be achieved before curing. Curing ensures the toughness and curing shrinkage of the coating, forming a rigid-flexible network cross-linked structure, firmly wrapping the filler to prevent it from falling off, ensuring a certain toughness to resist wiping stress, and improving scratch resistance. Detailed Implementation

[0024] The technical solutions in the embodiments of the present invention will be clearly and completely described below. 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 skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] It should be noted that the following quantities are by weight. There are no special restrictions on the manufacturers of the raw materials involved in this invention. Exemplary examples include: dispersant: BYK-190; wetting agent: BETTERSOL 607; low-viscosity polyurethane acrylate U-Cure. 9211; High-viscosity polyurethane acrylate U-Cure9215; Trimethylolpropane ethoxylate triacrylate: CAS No. 28961-43-5, Item No. 412171; Photoinitiator: 2-hydroxy-2-methyl-1-phenyl-1-propanone; Leveling agent: Leveling agent BYK-346; Defoamer: German BYK defoamer BYK024; Wall panel: Calcium silicate board; Sodium montmorillonite: 1250 mesh sodium bentonite; Amino polyethylene glycol mercapto: Item No. Delta-SN, molecular weight 600; Titanium dioxide: Anatase type 20nm; Tourmaline: Specification 500nm, Model HY-X625; Organotin catalyst: Dibutyltin dilaurate; Amino polyethylene glycol mercapto: Item No. Delta-SN, molecular weight 2400; Titanium dioxide: Anatase type 100nm; and other raw materials are all commercially available.

[0026] The following examples specifically illustrate: (1) The preparation process of epoxy silane modified titanium dioxide is as follows: titanium dioxide and KH-560 (3-(2,3-epoxypropoxy)propyltrimethoxysilane) with a mass ratio of 5:0.04 are added to an 80wt% ethanol aqueous solution, reacted at 70℃ for 5h, cooled, purified and dried to obtain epoxy silane modified titanium dioxide.

[0027] (2) The preparation process of acrylate silane modified tourmaline is as follows: tourmaline and 3-methacryloyloxypropylmethyldimethoxysilane with a mass ratio of 5:0.04 are added to 80wt% ethanol aqueous solution, reacted at 70℃ for 5h, cooled, purified and dried to obtain acrylate silane modified tourmaline.

[0028] Example 1: A method for preparing an indoor air-purifying wall panel based on negative ion release, comprising the following steps: Step 1: Add the composite filler (including alkenyl-modified composite montmorillonite and acrylate silane-modified tourmaline with a mass ratio of 3:1, and the average particle size of the tourmaline is 500nm) to deionized water, add dispersant and wetting agent, disperse at high speed, and grind to obtain composite filler water slurry (the mass ratio of composite filler, deionized water, dispersant and wetting agent is 65:100:2:2). Step 2: Blend 5 parts low-viscosity polyurethane acrylate (500 cps), 35 parts high-viscosity polyurethane acrylate (5000 cps), 15 parts composite filler water-based slurry, and 2 parts trimethylolpropane ethoxy acrylate. Add 1 part photoinitiator, 0.5 parts leveling agent, and 0.5 parts defoamer. Add deionized water to adjust the solid content (solid content is 35%) to obtain a negative ion releasing coating. Step 3: Apply the negative ion releasing coating to the wall panel surface (coating amount: 225g / m²), and UV cure (UV lamp power: 500mJ / cm²). 2 The process involves hot drying (at 75°C for 1.5 hours) followed by cooling to obtain indoor air purification wall panels. The preparation method of alkenyl-modified composite montmorillonite is as follows: Step 1: Add sodium montmorillonite (1250 mesh) and amino polyethylene glycol thiosulfate (molecular weight 600) to deionized water (mass ratio of sodium montmorillonite to amino polyethylene glycol thiosulfate is 90:8, molecular weight of amino polyethylene glycol thiosulfate is 600), stir at room temperature for 10 h to obtain intercalated montmorillonite. Step 2: Intercalated montmorillonite and epoxy silane-modified titanium dioxide were added to deionized water (the mass ratio of intercalated montmorillonite to epoxy silane-modified titanium dioxide was 4:1, and the particle size of titanium dioxide was 20 nm). The mixture was reacted at 70 °C for 3 h, filtered and dried to obtain composite montmorillonite. Step 3: Add composite montmorillonite, ethyl isocyanate acrylate, and organotin catalyst sequentially to anhydrous toluene (the mass ratio of composite montmorillonite, ethyl isocyanate acrylate, and organotin catalyst is 2:1:0.04). Set the temperature to 50℃, stir and react for 1.5 hours, filter and dry to obtain alkenyl-modified composite montmorillonite.

[0029] Example 2: A method for preparing an indoor air-purifying wall panel based on negative ion release, comprising the following steps: Step 1: Add the composite filler (including alkenyl-modified composite montmorillonite and acrylate silane-modified tourmaline with a mass ratio of 3.5:1.4, and the average particle size of the tourmaline is 500nm) to deionized water, add dispersant and wetting agent, disperse at high speed, and grind to obtain a composite filler aqueous slurry (the mass ratio of composite filler, deionized water, dispersant and wetting agent is 70:100:2.5:2.5). Step 2: Blend 10 parts of low-viscosity polyurethane acrylate (500 cps), 30 parts of high-viscosity polyurethane acrylate (5000 cps), 20 parts of composite filler water-based slurry, and 3.5 parts of trimethylolpropane ethoxy acrylate. Add 2 parts of photoinitiator, 1.2 parts of leveling agent, and 1.2 parts of defoamer. Add deionized water to adjust the solid content (solid content is 35%) to obtain a negative ion releasing coating. Step 3: Apply the negative ion releasing coating to the wall panel surface (coating amount: 225g / m²), and UV cure (UV lamp power: 500mJ / cm²). 2 The process involves hot drying (at 75°C for 1.5 hours) followed by cooling to obtain indoor air purification wall panels. The preparation method of alkenyl-modified composite montmorillonite is as follows: Step 1: Add sodium montmorillonite (1250 mesh) and amino polyethylene glycol thiosulfate (molecular weight 600) to deionized water (mass ratio of sodium montmorillonite to amino polyethylene glycol thiosulfate is 90:8, molecular weight of amino polyethylene glycol thiosulfate is 600), stir at room temperature for 10 h to obtain intercalated montmorillonite. Step 2: Intercalated montmorillonite and epoxy silane-modified titanium dioxide were added to deionized water (the mass ratio of intercalated montmorillonite to epoxy silane-modified titanium dioxide was 4:1, and the particle size of titanium dioxide was 20 nm). The mixture was reacted at 70 °C for 3 h, filtered and dried to obtain composite montmorillonite. Step 3: Add composite montmorillonite, ethyl isocyanate acrylate, and organotin catalyst sequentially to anhydrous toluene (the mass ratio of composite montmorillonite, ethyl isocyanate acrylate, and organotin catalyst is 2:1:0.04). Set the temperature to 50℃, stir and react for 1.5 hours, filter and dry to obtain alkenyl-modified composite montmorillonite.

[0030] Example 3: A method for preparing an indoor air-purifying wall panel based on negative ion release, comprising the following steps: Step 1: Add the composite filler (including alkenyl-modified composite montmorillonite and acrylate silane-modified tourmaline with a mass ratio of 4:1.8, and the average particle size of the tourmaline is 500nm) to deionized water, add dispersant and wetting agent, disperse at high speed, and grind to obtain composite filler water slurry (the mass ratio of composite filler, deionized water, dispersant and wetting agent is 75:100:3:3). Step 2: Blend 15 parts of low-viscosity polyurethane acrylate (500 cps), 25 parts of high-viscosity polyurethane acrylate (5000 cps), 25 parts of composite filler water-based slurry, and 5 parts of trimethylolpropane ethoxy acrylate. Add 3 parts of photoinitiator, 2 parts of leveling agent, and 2 parts of defoamer. Add deionized water to adjust the solid content (solid content is 35%) to obtain negative ion releasing coating. Step 3: Apply the negative ion releasing coating to the wall panel surface (coating amount: 225g / m²), and UV cure (UV lamp power: 500mJ / cm²). 2 The process involves hot drying (at 75°C for 1.5 hours) followed by cooling to obtain indoor air purification wall panels. The preparation method of alkenyl-modified composite montmorillonite is as follows: Step 1: Add sodium montmorillonite (1250 mesh) and amino polyethylene glycol thiosulfate (molecular weight 600) to deionized water (mass ratio of sodium montmorillonite to amino polyethylene glycol thiosulfate is 90:8, molecular weight of amino polyethylene glycol thiosulfate is 600), stir at room temperature for 10 h to obtain intercalated montmorillonite. Step 2: Intercalated montmorillonite and epoxy silane-modified titanium dioxide were added to deionized water (the mass ratio of intercalated montmorillonite to epoxy silane-modified titanium dioxide was 4:1, and the particle size of titanium dioxide was 20 nm). The mixture was reacted at 70 °C for 3 h, filtered and dried to obtain composite montmorillonite. Step 3: Add composite montmorillonite, ethyl isocyanate acrylate, and organotin catalyst sequentially to anhydrous toluene (the mass ratio of composite montmorillonite, ethyl isocyanate acrylate, and organotin catalyst is 2:1:0.04). Set the temperature to 50℃, stir and react for 1.5 hours, filter and dry to obtain alkenyl-modified composite montmorillonite.

[0031] Comparative Example 1: The titanium dioxide particle size in epoxy silane modified titanium dioxide is 100 nm; the rest is the same as in Example 2.

[0032] Comparative Example 2: The molecular weight of amino polyethylene glycol thiol is 3400; the rest is the same as in Example 2.

[0033] Comparative Example 3: The composite filler contained an excess of acrylate silane-modified tourmaline, and the rest was the same as in Example 2; the specific differences are as follows: Step 1: The composite filler (including alkenyl-modified composite montmorillonite and acrylate silane-modified tourmaline in a mass ratio of 3.5:5, with an average particle size of 500 nm) was added to deionized water, along with a dispersant and a wetting agent. The mixture was dispersed at high speed and ground to obtain an aqueous slurry of the composite filler (the mass ratio of composite filler, deionized water, dispersant, and wetting agent was 70:100:2.5:2.5). Step 2: Blend 10 parts of low-viscosity polyurethane acrylate (500 cps), 30 parts of high-viscosity polyurethane acrylate (5000 cps), 20 parts of composite filler water-based slurry, and 3.5 parts of trimethylolpropane ethoxy acrylate. Add 2 parts of photoinitiator, 1.2 parts of leveling agent, and 1.2 parts of defoamer. Add deionized water to adjust the solid content (solid content is 35%) to obtain a negative ion releasing coating. Step 3: Apply the negative ion releasing coating to the wall panel surface (coating amount: 225g / m²), and UV cure (UV lamp power: 500mJ / cm²). 2 The process involves hot drying (at 75°C for 1.5 hours) followed by cooling to obtain the indoor air purification wall panel.

[0034] Comparative Example 4: Montmorillonite, titanium dioxide, and tourmaline were physically blended as a composite filler, with the rest being the same as in Example 2; the specific differences are as follows: Sodium-based montmorillonite (1250 mesh), acrylate silane-modified titanium dioxide (particle size 20 nm), and acrylate silane-modified tourmaline (particle size 500 nm) in a mass ratio of 4:1.8:2.32 were physically blended to obtain a composite filler; it was added to deionized water, along with a dispersant and a wetting agent, dispersed at high speed, and ground to obtain an aqueous slurry of the composite filler (the mass ratio of composite filler, deionized water, dispersant, and wetting agent was 70:100:2.5:2.5); The preparation process of acrylate silane-modified titanium dioxide is as follows: titanium dioxide and 3-methacryloyloxypropylmethyldimethoxysilane in a mass ratio of 5:0.04 are added to an 80wt% ethanol aqueous solution, reacted at 70℃ for 5h, cooled, purified and dried to obtain acrylate silane-modified titanium dioxide.

[0035] Comparative Example 5: Only the mass ratio of low-viscosity polyurethane acrylate to high-viscosity polyurethane acrylate was adjusted; the rest was the same as in Example 2. The specific differences are as follows: Step 2: Blend 30 parts of low-viscosity polyurethane acrylate (500 cps), 10 parts of high-viscosity polyurethane acrylate (5000 cps), 20 parts of composite filler water-based slurry, and 3.5 parts of trimethylolpropane ethoxy acrylate. Add 2 parts of photoinitiator, 1.2 parts of leveling agent, and 1.2 parts of defoamer. Add deionized water to adjust the solid content (solid content is 35%) to obtain negative ion releasing coating.

[0036] Performance Test 1: The negative ion releasing coatings prepared in Examples 1-3 and Comparative Examples 1-5 were applied to indoor rooms of 64 square meters. The application areas were all interior walls facing due east. The formaldehyde content of the rooms was tested after 0h and 12h according to the test method of GB / T 15516-2006. The test results are shown in Table 1. Performance Test 2: The negative ion releasing coatings prepared in Examples 1-3 and Comparative Examples 1-5 were applied to the surfaces of two plates respectively. After curing, test plates were formed. The test was conducted at a temperature of (23±2℃) and a relative humidity of (50±5)% according to the test method of GB / T 9279.1-2015. Each test plate was scratched three times. If it was not scratched through in six times, it passed; if it was scratched through once or more in six times, it failed. The test results are shown in Table 1. Table 1

[0037] Conclusion: As can be seen from the data in Table 1 above, this application improves the formaldehyde removal effect and scratch resistance of the product by preparing negative ion releasing coating. Data from Comparative Example 1 shows that the titanium dioxide particle size in the epoxy silane-modified titanium dioxide is 100 nm, which easily forms agglomerates, causing stress concentration and a decrease in overall performance. Data from Comparative Example 2 shows that the molecular weight of amino polyethylene glycol mercapto is 3400, which reduces the adsorption sites, resulting in a higher formaldehyde content after 12 hours. Data from Comparative Example 3 shows that the excessive amount of acrylate silane-modified tourmaline in the composite filler reduces the adsorption sites. Although the negative ion concentration is slightly stronger, the formaldehyde removal capacity still decreases, the coating is unstable, and the overall performance decreases. Data from Comparative Example 4 shows that using montmorillonite, titanium dioxide, and tourmaline as a composite filler through physical blending reduces interfacial interaction, resulting in a significant decrease in overall performance. Data from Comparative Example 5 shows that adjusting only the mass ratio of low-viscosity polyurethane acrylate to high-viscosity polyurethane acrylate, with an excess of low-viscosity polyurethane acrylate, reduces toughness and has a relatively low impact on formaldehyde content, but a significant impact on scratch resistance, with all six samples being scratched.

[0038] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for preparing an indoor air-purifying wall panel based on negative ion release, characterized in that: Includes the following steps: Step 1: Add the composite filler to deionized water, add dispersant and wetting agent, disperse at high speed, and grind to obtain composite filler water slurry; Step 2: Blend low-viscosity polyurethane acrylate, high-viscosity polyurethane acrylate, composite filler water-based slurry, and trimethylolpropane ethoxy acrylate. Add photoinitiator, leveling agent, and defoamer. Add deionized water to adjust the solid content to obtain negative ion releasing coating. Step 3: Apply negative ion releasing coating to the surface of the wall panel, UV cure, heat dry, and cool to obtain indoor air purifying wall panel; The composite filler is composed of alkenyl-modified composite montmorillonite and acrylate silane-modified tourmaline.

2. The method for preparing an indoor air-purifying wall panel based on negative ion release according to claim 1, characterized in that: The composite filler includes alkenyl-modified composite montmorillonite and acrylate silane-modified tourmaline in a mass ratio of (3~4):(1~1.8).

3. The method for preparing an indoor air-purifying wall panel based on negative ion release according to claim 2, characterized in that: The preparation method of the alkenyl-modified composite montmorillonite is as follows: Step 1: Add sodium-based montmorillonite and amino-based polyethylene glycol mercapto to deionized water and stir at room temperature for 8-12 hours to obtain intercalated montmorillonite; Step 2: Add intercalated montmorillonite and epoxy silane modified titanium dioxide to deionized water, react at 60~80℃ for 2~4h, filter and dry to obtain composite montmorillonite; Step 3: Add the composite montmorillonite, ethyl isocyanate acrylate, and organotin catalyst sequentially to anhydrous toluene, set the temperature to 40~60℃, stir for 1~2 hours, filter and dry to obtain alkenyl-modified composite montmorillonite.

4. The method for preparing an indoor air-purifying wall panel based on negative ion release according to claim 3, characterized in that: In the intercalated montmorillonite, the mass ratio of sodium-based montmorillonite to amino-polyethylene glycol thiosulfate is (85~95):(5~12), and the molecular weight of amino-polyethylene glycol thiosulfate is 400~1000.

5. The method for preparing an indoor air-purifying wall panel based on negative ion release according to claim 3, characterized in that: In the composite montmorillonite, the mass ratio of intercalated montmorillonite to epoxy silane-modified titanium dioxide is (2~6):1; In the alkenyl-modified composite montmorillonite, the mass ratio of composite montmorillonite, ethyl isocyanate acrylate, and organotin catalyst is (1~3):1:(0.02~0.05).

6. The method for preparing an indoor air-purifying wall panel based on negative ion release according to claim 3, characterized in that: The sodium-based montmorillonite has a particle size of 1000-1500 mesh; the epoxy-silane-modified titanium dioxide has an average particle size of 10-30 nm; and the acrylate silane-modified tourmaline has an average particle size of 500-1000 nm.

7. The method for preparing an indoor air-purifying wall panel based on negative ion release according to claim 1, characterized in that: The negative ion releasing coating has a solid content of 30-40%; the raw materials of the negative ion releasing coating include the following components, by mass parts: 5-15 parts low viscosity polyurethane acrylate, 25-35 parts high viscosity polyurethane acrylate, 15-25 parts composite filler water-based slurry, 2-5 parts trimethylolpropane ethoxy acrylate, 1-3 parts photoinitiator, 0.5-2 parts leveling agent, and 0.5-2 parts defoamer; In the composite filler aqueous slurry, the mass ratio of composite filler, deionized water, dispersant, and wetting agent is (65~75):100:(2~3):(2~3).

8. The method for preparing an indoor air-purifying wall panel based on negative ion release according to claim 1, characterized in that: The viscosity of the low-viscosity polyurethane acrylate is 300~800 cps at 25°C, and the viscosity of the high-viscosity polyurethane acrylate is 5000~10000 cps at 25°C.

9. The method for preparing an indoor air-purifying wall panel based on negative ion release according to claim 1, characterized in that: The UV curing process parameters are as follows: UV lamp power 400~600mJ / cm². 2 The drying time is 10-40 minutes; the process parameters for the heat drying are: temperature 60-90℃, time 1-2 hours.

10. An indoor air purification wall panel prepared by the method for preparing an indoor air purification wall panel based on negative ion release according to any one of claims 1 to 9.

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