Inorganic composite environmentally friendly coating for photocatalytic air purification and preparation method thereof

Abstract

The present application discloses an inorganic composite environmentally friendly coating for photocatalytic air purification and a preparation method thereof. The coating comprises the following raw material components by mass: 30 to 60 parts of emulsion; 5 to 20 parts of porous substance-dye molecule-TiO2 photocatalytic composite material; 10 to 30 parts of inorganic filler; 1 to 5 parts of auxiliary agent; and 10 to 40 parts of water. The porous substance-dye molecule-TiO2 photocatalytic composite material is a composite material formed by loading dye molecules onto the surface of titanium dioxide on the surface or in the pores of the porous substance. The porous substance is used to provide a more sufficient photocatalytic substrate, and the light absorption ability of the dye molecules is used to promote photocatalytic ability, thereby enhancing the air purification effect and improving the purification efficiency.

Description

Technical Field

[0001] The present application relates to the field of coating technology, and in particular to an inorganic composite environmentally friendly coating for photocatalytic air purification and a preparation method thereof. Background Art

[0002] Traditional paints release harmful gases like formaldehyde during the drying and curing process, severely impacting indoor air quality and potentially harming occupants' health. Research is exploring the possibility of adding photocatalysts to paint formulations. This approach uses light to stimulate the photocatalysts, generating highly reactive hydroxyl radicals with strong oxidizing power. This degrades organic pollutants and also breaks down harmful substances like formaldehyde in the air.

[0003] However, the photocatalytic effect of photocatalytic environmentally friendly coatings is directly affected by the light source conditions. The photocatalytic environmentally friendly coatings currently on the market have strict requirements on light sources and need to pay attention to sufficient light source supply. The purification efficiency of harmful gases is not high. Summary of the Invention

[0004] The present application provides an inorganic composite environmentally friendly coating for photocatalytic air purification and a preparation method thereof, in order to solve the technical problem that the current photocatalytic coating has low purification efficiency for harmful gases.

[0005] In order to solve the above technical problems, in a first aspect, the present application provides an inorganic composite environmentally friendly coating for photocatalytic air purification, comprising the following raw material components in parts by mass:

[0006] 30 to 60 parts of emulsion;

[0007] 5 to 20 parts of a porous material-dye molecule-TiO2 photocatalytic composite material;

[0008] 10 to 30 parts of inorganic filler;

[0009] 1 to 5 parts of additives;

[0010] 10 to 40 parts water;

[0011] The porous material-dye molecule-TiO2 photocatalytic composite material is a composite material formed by loading dye molecules onto the surface of titanium dioxide on the surface or in the pores of the porous material.

[0012] In some embodiments, the method for preparing the porous material-dye molecule-TiO2 photocatalytic composite material comprises the following steps:

[0013] Dispersing titanium dioxide particles in anhydrous ethanol and ultrasonically treating for 20 to 40 minutes until the titanium dioxide particles are evenly dispersed; then adding 3-aminopropyltriethoxysilane, adjusting the pH to 7 to 9, and stirring for 2 to 4 hours to obtain a titanium dioxide dispersion;

[0014] The dye molecules are dissolved in dimethyl sulfoxide, and then added to the titanium dioxide dispersion, stirred for 6 to 12 hours, filtered and impurities removed to obtain dye molecule-TiO2 composite particles;

[0015] The porous material is uniformly dispersed in ethanol, and then the dye molecule-TiO2 composite particles are added. After stirring at 500rpm~1000rpm for 2h~4h, methyl cellulose is added and stirring is continued for 30min~60min. The porous material is filtered, impurities are removed, and dried. After heat treatment at 300℃~500℃, it is cooled to room temperature to obtain a porous material-dye molecule-TiO2 photocatalytic composite material.

[0016] In some embodiments, the titanium dioxide particles have a particle size of 10 nm to 50 nm.

[0017] In some embodiments, the mass ratio of the titanium dioxide particles, the dye molecules and the porous material is 5:1:10.

[0018] In some embodiments, the porous material includes, but is not limited to, one or more of diatomaceous earth, activated carbon, zeolite, porous ceramics, montmorillonite, bentonite, porous silica, and porous alumina.

[0019] In some embodiments, the dye molecules include but are not limited to one or more of phthalocyanine dye molecules, porphyrin dye molecules, rhodamine dye molecules and pyridine dye molecules.

[0020] In some embodiments, the phthalocyanine dye molecules include one or two of copper phthalocyanine, zinc phthalocyanine, iron phthalocyanine, cobalt phthalocyanine and nickel phthalocyanine;

[0021] Or, the porphyrin dye molecules include one or more of hematoporphyrin, porphyrin iron, porphyrin copper, dihydrochlorin e6 and dihydrochlorin e4;

[0022] Or, the rhodamine dye molecules include one or two of rhodamine B, rhodamine 6G, rhodamine X and rhodamine green;

[0023] Alternatively, the pyridine dye molecules include one or both of zinc pyridine and cobalt pyridine.

[0024] In some embodiments, the emulsion includes any one of acrylic emulsion, styrene acrylic emulsion, polyvinyl acetate emulsion and polyvinyl alcohol emulsion;

[0025] The inorganic filler includes one or more of silicon dioxide, talc, mica, kaolin, calcium carbonate, barium sulfate, wollastonite, titanium dioxide, graphite and carbon black.

[0026] In some embodiments, the auxiliary agent includes one or more of a dispersant, a defoaming agent, a leveling agent, a thickener, a preservative, a wetting agent, an antistatic agent, a mildewproof agent, a cross-linking agent, and a flame retardant.

[0027] In a second aspect, the present invention also provides a method for preparing the above-mentioned inorganic composite environmentally friendly coating for photocatalytic air purification, comprising the following steps:

[0028] Add emulsion, inorganic filler, additive and water into a stirrer and stir at 500 rpm to 1000 rpm for 15 to 30 minutes; then add porous substance-dye molecule-TiO2 photocatalytic composite material and stir at 1500 rpm to 3000 rpm for 1 to 2 hours to obtain a composite environmentally friendly coating for photocatalytic air purification.

[0029] Compared with the prior art, this application has at least the following beneficial effects:

[0030] The present application combines a porous material, dye molecules and TiO2 into a photocatalytic composite material. In photocatalysis, the porous material has a high specific surface area and can provide a large number of adsorption sites, effectively adsorbing organic pollutants, particulate matter, harmful gases, etc. in the air, providing more sufficient substrate for subsequent photocatalytic reactions. The dye molecules have a strong ability to absorb visible light and can extend the light response range of TiO2 to the visible light region, reducing light source requirements and enhancing light absorption efficiency. After absorbing light energy, the dye molecules transfer energy to TiO2 through an energy transfer mechanism, causing it to produce more active oxygen species, thereby improving photocatalytic efficiency. The pore structure of the porous material can increase light scattering, further enhancing the photocatalytic effect. The dye molecules absorb visible light to generate an excited state. The excited dye molecules transfer electrons to the conduction band of titanium dioxide and become oxidized states, thereby effectively separating photogenerated electron-hole pairs through the photosensitization of the dye molecules. The pore structure of the porous material promotes the separation of photogenerated electron and hole pairs. The separated electrons and holes participate in the photocatalytic reaction, enhancing the air purification effect and improving the purification efficiency. DETAILED DESCRIPTION

[0031] To make the above-mentioned objects, features, and advantages of the present invention more readily apparent, specific embodiments of the present invention are described in detail below. The following description sets forth numerous specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0032] As used herein, the term "prepared from" is synonymous with "comprising." As used herein, the terms "comprising," "including," "having," "containing," or any other variations thereof, are intended to cover a non-exclusive inclusion. For example, a composition, process, method, article, or apparatus that comprises the listed elements is not necessarily limited to only those elements but may include other elements not expressly listed or inherent to such composition, process, method, article, or apparatus.

[0033] When amount, concentration or other value or parameter is represented with range, preferred range or the range that a series of upper preferred value and lower preferred value limit are expressed, this should be understood as specifically disclosing all ranges formed by any pairing of any range upper limit or preferred value and any range lower limit or preferred value, no matter whether this range is disclosed separately.For example, when disclosing scope "1 to 5", described scope should be interpreted as including scope "1 to 4", "1 to 3", "1 to 2", "1 to 2 and 4 to 5", "1 to 3 and 5" etc.When numerical range is described in this article, unless otherwise stated, otherwise this scope is intended to include its end value and all integers and fractions within this range.

[0034] In addition, the indefinite articles "a" and "an" before the elements or components of the present invention do not limit the quantity requirement (i.e., the number of times the elements or components appear). Therefore, "a" or "an" should be interpreted as including one or at least one, and elements or components in the singular also include plural forms, unless the number is obviously intended to be singular.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the present invention pertains. The terms used herein in the specification of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0036] Composite material preparation example 1

[0037] The preparation method of the activated carbon-copper phthalocyanine-TiO2 photocatalytic composite material comprises the following steps:

[0038] Weigh the raw materials with a mass ratio of 10 nm titanium dioxide particles, copper phthalocyanine, and activated carbon of 5:1:10;

[0039] Dispersing titanium dioxide particles in anhydrous ethanol and ultrasonically treating for 20 minutes until the titanium dioxide particles are evenly dispersed; then adding 3-aminopropyltriethoxysilane, adjusting the pH to 7-9, and stirring for 4 hours to obtain a titanium dioxide dispersion;

[0040] Dissolve copper phthalocyanine in dimethyl sulfoxide, add it to the titanium dioxide dispersion, stir for 6 hours, filter and remove impurities to obtain copper phthalocyanine-TiO2 composite particles;

[0041] Activated carbon was evenly dispersed in ethanol, and then dye molecules-TiO2 composite particles were added. After stirring at 500 rpm for 4 hours, methyl cellulose was added and stirring was continued for 60 minutes. The mixture was filtered, impurities were removed, and dried. After heat treatment at 300°C, it was cooled to room temperature to obtain an activated carbon-copper phthalocyanine-TiO2 photocatalytic composite material.

[0042] Composite material preparation example 2

[0043] The preparation method of the porous silica-porphyrin copper-TiO2 photocatalytic composite material comprises the following steps:

[0044] The raw materials were weighed with a mass ratio of 25 nm titanium dioxide particles, copper porphyrin, and porous silica of 5:1:10;

[0045] Dispersing titanium dioxide particles in anhydrous ethanol and ultrasonically treating for 40 minutes until the titanium dioxide particles are evenly dispersed; then adding 3-aminopropyltriethoxysilane, adjusting the pH to 7-9, and stirring for 2 hours to obtain a titanium dioxide dispersion;

[0046] The copper porphyrin was dissolved in dimethyl sulfoxide, and then added to the titanium dioxide dispersion, stirred for 12 hours, filtered and impurities were removed to obtain the copper porphyrin-TiO2 composite particles;

[0047] Porous silica was uniformly dispersed in ethanol, and porphyrin copper-TiO2 composite particles were added. After stirring at 1000 rpm for 2 hours, methyl cellulose was added and stirring was continued for 30 minutes. The mixture was filtered, impurities were removed, and dried. After heat treatment at 500°C, it was cooled to room temperature to obtain a porous silica-porphyrin copper-TiO2 photocatalytic composite material.

[0048] Composite material preparation example 3

[0049] The preparation method of the diatomaceous earth-rhodamine green-TiO2 photocatalytic composite material comprises the following steps:

[0050] Weigh the raw materials with a mass ratio of 35 nm titanium dioxide particles, rhodamine green, and diatomaceous earth of 5:1:10;

[0051] Dispersing titanium dioxide particles in anhydrous ethanol and ultrasonically treating for 30 minutes until the titanium dioxide particles are evenly dispersed; then adding 3-aminopropyltriethoxysilane, adjusting the pH to 7-9, and stirring for 3 hours to obtain a titanium dioxide dispersion;

[0052] The dye molecules were dissolved in dimethyl sulfoxide, and then added to the titanium dioxide dispersion, stirred for 8 hours, filtered, and impurities were removed to obtain dye molecule-TiO2 composite particles;

[0053] The porous material was evenly dispersed in ethanol, and then dye molecules-TiO2 composite particles were added. After stirring at 700 rpm for 3.5 hours, methyl cellulose was added and stirring was continued for 35 minutes. The mixture was filtered, impurities were removed, and dried. After heat treatment at 400°C, it was cooled to room temperature to obtain a diatomaceous earth-rhodamine green-TiO2 photocatalytic composite material.

[0054] Composite material preparation example 4

[0055] The preparation method of the bentonite-cobalt pyridine-TiO2 photocatalytic composite material comprises the following steps:

[0056] Weigh the raw materials with a mass ratio of 50 nm titanium dioxide particles, cobalt pyridine and bentonite of 5:1:10;

[0057] Titanium dioxide particles were dispersed in anhydrous ethanol and ultrasonically treated for 35 minutes until the titanium dioxide particles were uniformly dispersed; 3-aminopropyltriethoxysilane was then added, and the pH was adjusted to 7-9, and stirred for 2.8 hours to obtain a titanium dioxide dispersion;

[0058] Dissolve cobalt pyridine in dimethyl sulfoxide, add it to the titanium dioxide dispersion, stir for 10 hours, filter and remove impurities to obtain dye molecule-TiO2 composite particles;

[0059] The porous material was evenly dispersed in ethanol, and then dye molecules-TiO2 composite particles were added. After stirring at 900 rpm for 2.5 hours, methyl cellulose was added and stirring was continued for 45 minutes. The mixture was filtered, impurities were removed, and dried. After heat treatment at 400°C, it was cooled to room temperature to obtain a bentonite-cobalt pyridine-TiO2 photocatalytic composite material.

[0060] Example 1

[0061] The composite environmentally friendly coating for photocatalytic air purification comprises the following raw material components in parts by mass:

[0062] 30 parts of acrylic emulsion;

[0063] 5 parts of the activated carbon-copper phthalocyanine-TiO2 photocatalytic composite material of Preparation Example 1;

[0064] 10 parts of calcium carbonate;

[0065] 1 part of fatty alcohol polyoxyethylene ether;

[0066] 10 parts water;

[0067] A method for preparing a composite environmentally friendly coating for photocatalytic air purification comprises the following steps:

[0068] The emulsion, inorganic filler, additive and water were added to a stirrer and stirred at 500 rpm for 30 minutes; then the activated carbon-copper phthalocyanine-TiO2 photocatalytic composite material was added and stirred at 3000 rpm for 1 hour to obtain a composite environmentally friendly coating for photocatalytic air purification.

[0069] Example 2

[0070] The composite environmentally friendly coating for photocatalytic air purification comprises the following raw material components in parts by mass:

[0071] 60 parts of acrylic emulsion;

[0072] 20 parts of porous silica-porphyrin copper-TiO2 photocatalytic composite material;

[0073] 30 parts of calcium carbonate;

[0074] 5 parts of fatty alcohol polyoxyethylene ether;

[0075] 40 parts water;

[0076] A method for preparing a composite environmentally friendly coating for photocatalytic air purification comprises the following steps:

[0077] The emulsion, inorganic filler, additive and water were added to a stirrer and stirred at 1000 rpm for 15 minutes; then the porous silica-porphyrin copper-TiO2 photocatalytic composite material was added and stirred at 1500 rpm for 2 hours to obtain a composite environmentally friendly coating for photocatalytic air purification.

[0078] Example 3

[0079] The composite environmentally friendly coating for photocatalytic air purification comprises the following raw material components in parts by mass:

[0080] 40 parts of acrylic emulsion;

[0081] 10 parts of diatomaceous earth-rhodamine green-TiO2 photocatalytic composite material;

[0082] 15 parts of calcium carbonate;

[0083] 3 parts of fatty alcohol polyoxyethylene ether;

[0084] 20 parts water;

[0085] A method for preparing a composite environmentally friendly coating for photocatalytic air purification comprises the following steps:

[0086] The emulsion, inorganic filler, additive and water were added to a stirrer and stirred at 600 rpm for 25 minutes; then the diatomaceous earth-rhodamine green-TiO2 photocatalytic composite material was added and stirred at 2000 rpm for 1.5 hours to obtain a composite environmentally friendly coating for photocatalytic air purification.

[0087] Example 4

[0088] The composite environmentally friendly coating for photocatalytic air purification comprises the following raw material components in parts by mass:

[0089] 40 parts of acrylic emulsion;

[0090] 15 parts of bentonite-cobalt pyridine-TiO2 photocatalytic composite material;

[0091] 25 parts of calcium carbonate;

[0092] 3 parts of fatty alcohol polyoxyethylene ether;

[0093] 30 parts water;

[0094] A method for preparing a composite environmentally friendly coating for photocatalytic air purification comprises the following steps:

[0095] The emulsion, inorganic filler, additive and water were added to a stirrer and stirred at 900 rpm for 25 minutes; then the bentonite-cobalt pyridine-TiO2 photocatalytic composite material was added and stirred at 2500 rpm for 1.5 hours to obtain a composite environmentally friendly coating for photocatalytic air purification.

[0096] Comparative Example 1

[0097] Compared with Example 1, the titanium dioxide particles of Preparation Example 1 were used to replace the activated carbon-copper phthalocyanine-TiO2 photocatalytic composite material, and the rest was the same as Example 1.

[0098] Comparative Example 2

[0099] Compared with Example 1, the copper phthalocyanine-TiO2 composite particles of Preparation Example 1 were used instead of the activated carbon-copper phthalocyanine-TiO2 photocatalytic composite material, and the rest was the same as Example 1.

[0100] Comparative Example 3

[0101] Compared with Example 1, activated carbon-TiO2 composite particles are used instead of the activated carbon-copper phthalocyanine-TiO2 photocatalytic composite material, and the rest is the same as Example 1. The preparation method of the activated carbon-TiO2 composite particles includes: dispersing titanium dioxide particles in anhydrous ethanol, ultrasonically treating for 20 minutes until the titanium dioxide particles are uniformly dispersed; then adding 3-aminopropyltriethoxysilane, adjusting the pH to 7-9, and stirring for 4 hours to obtain a titanium dioxide dispersion; uniformly dispersing activated carbon in the titanium dioxide dispersion, stirring at 500 rpm for 4 hours, adding methyl cellulose, and continuing to stir for 60 minutes, filtering, removing impurities, drying, and then heat treating at 300°C and cooling to room temperature to obtain activated carbon-TiO2 composite particles.

[0102] In accordance with GBT 18204.26-2000 Requirements for the determination of organic gases in the air of public places, the coatings of Examples 1 to 4 and Comparative Examples 1 to 3 were tested for their photocatalytic purification efficiency of organic gases; in accordance with JC / T1074-2008 Purification Performance of Indoor Air Purification Functional Coating Materials, the above coatings were tested for formaldehyde purification efficiency.

[0103]

[0104]

[0105] As can be seen from the table above, compared to Comparative Examples 1 to 3, the composite environmentally friendly coatings prepared in Examples 1 to 4 of the present application achieved an organic gas decomposition efficiency of over 92.2% under 4 hours of photocatalysis, and formaldehyde purification efficiencies of greater than 99%, significantly superior to Comparative Examples 1 to 3. This shows that the use of the porous material-dye molecule-TiO2 photocatalytic composite material as a photocatalyst in the present application enables the coating to have better purification effect and efficiency.

[0106] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0107] The specific embodiments described above further illustrate the objectives, technical solutions, and beneficial effects of this application. It should be understood that the above descriptions are merely specific embodiments of this application and are not intended to limit the scope of protection of this application. In particular, it should be noted that any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of this application by those skilled in the art should be included within the scope of protection of this application.

Claims

1. An inorganic composite environmentally friendly coating for photocatalytic air purification, characterized in that: The invention comprises the following raw material components in parts by mass: 30 to 60 parts of emulsion; 5 to 20 parts of a porous material-dye molecule-TiO2 photocatalytic composite material; 10 to 30 parts of inorganic filler; 1 to 5 parts of additives; 10 to 40 parts water; The porous material-dye molecule-TiO2 photocatalytic composite material is a composite material formed by loading dye molecules onto the surface of titanium dioxide on the surface or in the pores of the porous material. The preparation method of the porous material-dye molecule-TiO2 photocatalytic composite material comprises the following steps: Dispersing titanium dioxide particles in anhydrous ethanol and ultrasonically treating for 20 to 40 minutes until the titanium dioxide particles are evenly dispersed; then adding 3-aminopropyltriethoxysilane, adjusting the pH to 7 to 9, and stirring for 2 to 4 hours to obtain a titanium dioxide dispersion; The dye molecules are dissolved in dimethyl sulfoxide, and then added to the titanium dioxide dispersion, stirred for 6 to 12 hours, filtered and impurities removed to obtain dye molecule-TiO2 composite particles; The porous material is uniformly dispersed in ethanol, and then dye molecules-TiO2 composite particles are added. After stirring at 500 rpm to 1000 rpm for 2 hours to 4 hours, methyl cellulose is added and stirring is continued for 30 minutes to 60 minutes. The porous material is filtered, impurities are removed, and dried. After heat treatment at 300°C to 500°C, the mixture is cooled to room temperature to obtain a porous material-dye molecules-TiO2 photocatalytic composite material. The particle size of the titanium dioxide particles is 10 nm to 50 nm, and the mass ratio of the titanium dioxide particles, the dye molecules and the porous material is 5:1:

10.

2. The inorganic composite environmentally friendly paint for photocatalytic air purification according to claim 1, characterized in that: The porous substance includes, but is not limited to, one or more of diatomaceous earth, activated carbon, zeolite, porous ceramics, montmorillonite, bentonite, porous silica, and porous alumina.

3. The inorganic composite environmentally friendly paint for photocatalytic air purification according to claim 1, characterized in that: The dye molecules include, but are not limited to, one or more of phthalocyanine dye molecules, porphyrin dye molecules, rhodamine dye molecules, and pyridine dye molecules.

4. The inorganic composite environmentally friendly paint for photocatalytic air purification according to claim 3, characterized in that: The phthalocyanine dye molecules include one or two of copper phthalocyanine, zinc phthalocyanine, iron phthalocyanine, cobalt phthalocyanine and nickel phthalocyanine; Or, the porphyrin dye molecules include one or more of hematoporphyrin, porphyrin iron, porphyrin copper, dihydrochlorin e6 and dihydrochlorin e4; Or, the rhodamine dye molecules include one or two of rhodamine B, rhodamine 6G, rhodamine X and rhodamine green; Alternatively, the pyridine dye molecules include one or both of zinc pyridine and cobalt pyridine.

5. The inorganic composite environmentally friendly paint for photocatalytic air purification according to claim 1, characterized in that: The emulsion includes any one of acrylic emulsion, polyvinyl acetate emulsion and polyvinyl alcohol emulsion; The inorganic filler includes one or more of silicon dioxide, talc, mica, kaolin, calcium carbonate, barium sulfate, wollastonite, titanium dioxide, graphite and carbon black.

6. The inorganic composite environmentally friendly paint for photocatalytic air purification according to claim 1, characterized in that: The auxiliary agent includes one or more of a dispersant, a defoaming agent, a leveling agent, a thickener, a preservative, a wetting agent, an antistatic agent, a mildewproof agent, a cross-linking agent and a flame retardant.

7. A method for preparing an inorganic composite environmentally friendly coating for photocatalytic air purification according to any one of claims 1 to 6, characterized in that: The following steps are involved: Add emulsion, inorganic filler, additive and water into a stirrer and stir at 500 rpm to 1000 rpm for 15 to 30 minutes; then add porous substance-dye molecule-TiO2 photocatalytic composite material and stir at 1500 rpm to 3000 rpm for 1 to 2 hours to obtain a composite environmentally friendly coating for photocatalytic air purification.

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