CN112266666A - Photocatalytic environment-friendly coating for purifying air pollutants and preparation method thereof - Google Patents

Photocatalytic environment-friendly coating for purifying air pollutants and preparation method thereof Download PDF

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CN112266666A
CN112266666A CN202010983446.6A CN202010983446A CN112266666A CN 112266666 A CN112266666 A CN 112266666A CN 202010983446 A CN202010983446 A CN 202010983446A CN 112266666 A CN112266666 A CN 112266666A
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photocatalytic
environment
agent
coating
mixed solution
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赵梓俨
李伟
赵梓权
万文超
刘劲鹏
刘帅卓
曾广勇
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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D143/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and containing boron, silicon, phosphorus, selenium, tellurium, or a metal; Coating compositions based on derivatives of such polymers
    • C09D143/04—Homopolymers or copolymers of monomers containing silicon
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D133/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers
    • C09D133/04—Homopolymers or copolymers of esters
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/43—Thickening agents
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/60—Additives non-macromolecular
    • C09D7/61—Additives non-macromolecular inorganic
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/60—Additives non-macromolecular
    • C09D7/63—Additives non-macromolecular organic
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/20—Oxides; Hydroxides
    • C08K3/22—Oxides; Hydroxides of metals
    • C08K2003/2237—Oxides; Hydroxides of metals of titanium
    • C08K2003/2241—Titanium dioxide
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/24—Acids; Salts thereof
    • C08K3/26—Carbonates; Bicarbonates
    • C08K2003/265—Calcium, strontium or barium carbonate
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/32—Phosphorus-containing compounds
    • C08K2003/321—Phosphates
    • C08K2003/324—Alkali metal phosphate
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2201/00—Properties
    • C08L2201/08—Stabilised against heat, light or radiation or oxydation
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend

Abstract

The invention relates to the technical field of coatings, and particularly discloses a photocatalytic environment-friendly coating for purifying air pollutants and a preparation method thereof, wherein the photocatalytic environment-friendly coating comprises the following components in percentage by mass: 1-8% of visible light response photocatalytic material, 5-20% of environment-friendly emulsion, 10-25% of filler, 1-5% of dispersing agent, 0.5-1% of film-forming assistant, 0.2-1% of thickening agent, 0.2-0.5% of flatting agent, 0.1-0.5% of defoaming agent, 0.5-1% of pigment and 38-80.5% of solvent. The photocatalytic coating provided by the invention is a green environment-friendly coating, wherein the photocatalytic material is a visible light responsive photocatalytic material, and the coating has the advantages of simple preparation process and excellent photocatalytic performance and can endow the coating with an air purification function.

Description

Photocatalytic environment-friendly coating for purifying air pollutants and preparation method thereof
Technical Field
The invention relates to the technical field of coatings, in particular to a photocatalytic environment-friendly coating for purifying air pollutants and a preparation method thereof.
Background
Ozone, NOxAnd the air pollution caused by pollutants is intensified, so that the appeal of people on environmental purification is stimulated. Ozone in cities is mainly composed of Nitrogen Oxides (NO) in the atmospherex) And secondary pollutants generated by photochemical reaction of precursors such as Volatile Organic Compounds (VOCs) under the irradiation of solar ultraviolet rays. Ozone generation and consumption mainly depend on control of atmospheric photochemical reaction, and influencing factors comprise meteorological conditions such as solar radiation, temperature, humidity and the like, and are closely related to concentration change of precursor of the ozone.
Traditional environmental protection coating self hangs down VOCs or does not have VOCs, but does not possess purification performance, and present most purification coating purifies to the absorption mode, not only can cause secondary pollution, does not also possess the function of initiative air-purifying.
In order to solve the current air pollution problem, the photocatalysis technology based on solar energy is used for purifying ozone and NOxExcellent performance in terms of equal pollutantsLow energy consumption, environmental protection and the like, and is concerned by people. The photocatalytic material is a material with photocatalytic air purification function, and is excited under the condition of illumination to generate photoproduction electrons and photoproduction holes which react with oxygen and water molecules in the air to form superoxide radical and hydroxyl radical with extremely strong oxidizing power, and the formed free radical can react with ozone and NOxAir pollutants such as formaldehyde and VOCs undergo redox reaction, and harmful gas pollutants react into water and carbon dioxide, so that the effect of degrading the pollutants is achieved, and the purpose of purifying air is achieved.
However, the actual effect of the conventional photocatalytic material in purifying air is not ideal. With TiO2Typical of conventional photocatalytic materials, TiO2The photocatalytic material needs ultraviolet light to play a role, needs the ultraviolet light for excitation, has special requirements on the intensity and the illumination condition of the ultraviolet light, causes certain damage to human health, and is not suitable for long-time irradiation. In terms of energy, the ultraviolet light accounts for only about 4% of the solar energy, while the visible light accounts for 43% of the solar energy, so that TiO is usually used2The purification effect of (2) is poor. Therefore, how to overcome the defects of poor air purification effect and low conversion rate of the existing photocatalytic material becomes a technical problem which needs to be solved urgently.
Disclosure of Invention
The invention aims to provide a photocatalytic environment-friendly coating for purifying air pollutants, which solves the problems of poor effect and low conversion rate of the existing photocatalytic material coating when the existing photocatalytic material coating is actually used for purifying air.
In order to achieve the purpose, the invention adopts the following technical scheme:
a photocatalytic environment-friendly coating for purifying air pollutants, which comprises the following components in percentage by mass: 1-8% of visible light response photocatalytic material, 5-20% of environment-friendly emulsion, 10-25% of filler, 1-5% of dispersing agent, 0.5-1% of film-forming assistant, 0.2-1% of thickening agent, 0.2-0.5% of flatting agent, 0.1-0.5% of defoaming agent, 0.5-1% of pigment and 38-80.5% of solvent.
Further, the photocatalytic material is C3N4Doped C3N4Composite C3N4And one or more of nanometer bismuth series oxides.
Further, the doped C3N4The doped elements comprise one or more of non-metal elements, alkali metal elements and alkaline earth metal elements, such as C, O, N, K, Na, Ca, Mg and the like.
Further, the environment-friendly emulsion is one or more of water-based silicone acrylic emulsion, water-based polyacrylic emulsion, water-based acrylic resin dispersion, water-based acrylic resin aqueous solution water-based styrene-acrylic emulsion, water-based acrylic emulsion, polyurethane emulsion, silicate solution and water-based silicone resin, wherein the silicate comprises aluminum silicate, iron silicate, calcium silicate, magnesium silicate, potassium silicate and sodium silicate.
Further, the filler is one or more of calcium carbonate (heavy calcium, light calcium), silicon dioxide, kaolin, diatomite, wollastonite, talcum powder, white carbon black, graphite, barite, titanium dioxide, sepiolite, alumina powder, glass powder, asbestos powder, mica powder, quartz powder, precipitated barium sulfate, wollastonite, bentonite, shell powder and diatom ooze.
Further, the solvent is water solvent or silica sol or low-concentration ethanol.
Further, the auxiliary agent is one or more of a film forming auxiliary agent, a dispersing agent, a flatting agent, a defoaming agent and a thickening agent.
Further, the pigment is an inorganic pigment including one or more of metal oxides, chromates, carbonates, sulfates, and sulfides.
The second objective of the present invention is to provide a method for preparing the photocatalytic environmental protection coating for air pollutant purification, which comprises the following steps:
weighing the raw material components for preparing the photocatalytic environment-friendly coating according to the proportion, mixing a photocatalytic material with the emulsion, and uniformly stirring at a constant speed to obtain a first mixed solution;
mixing and soaking the filler and the solvent to obtain a second mixed solution;
adding the second mixed solution into the first mixed solution, and mechanically and uniformly stirring to obtain a third mixed solution;
adding a dispersing agent, a film forming auxiliary agent, a flatting agent and a defoaming agent into the third mixed solution, and mechanically and uniformly stirring to obtain a fourth mixed solution;
and adding the pigment and the thickening solution into the fourth mixed solution in sequence, and uniformly stirring at a constant speed to obtain the photocatalytic environment-friendly coating.
Further, the rotation speed of the mechanical stirring is 200-800r/min, and the stirring time is 0.5-2 h.
The invention has the beneficial effects that:
the invention provides a photocatalytic environment-friendly coating for purifying air pollutants, which comprises the following components in percentage by mass: 1-8% of visible light response photocatalytic material, 5-20% of environment-friendly emulsion, 10-25% of filler, 1-5% of dispersing agent, 0.5-1% of film-forming assistant, 0.2-1% of thickening agent, 0.2-0.5% of flatting agent, 0.1-0.5% of defoaming agent, 0.5-1% of pigment and 38-80.5% of solvent. The photocatalytic environment-friendly coating prepared by adopting the visible light responsive photocatalytic material has excellent photocatalytic performance, good photochemical stability and higher thermal stability, and is beneficial to practical application. The preparation condition is mild, the preparation method is simple, the production process is simple and easy to control, the cost is low, and the large-scale production is facilitated. The photocatalytic environment-friendly coating for purifying air pollutants, provided by the invention, has excellent photocatalytic activity, can be widely applied to the field of air purification, especially the field of water-based environment-friendly coatings, and has the application scenes of inner walls and outer walls, and the coating has good waterproofness, weather resistance, anti-crusting property, high-efficiency and stable photocatalytic performance and cyclicity.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a flow chart of a method for preparing a photocatalytic eco-friendly coating for air pollutant purification according to an embodiment of the present invention;
FIG. 2 is a graph showing the results of testing the ozone degradation rate of the photocatalytic environmental protection coating in the embodiment of the present invention;
FIG. 3 shows the photocatalytic eco-friendly coating test NO in the example of the present inventionxResults for degradation rate are shown schematically.
Detailed Description
The numerical values set forth in the examples of the present invention are approximations, not necessarily values. All values within the error range may be included without limiting to the specific values disclosed in the embodiments of the present invention, where the error or experimental conditions allow.
The numerical ranges disclosed in the examples of the present invention are intended to indicate the relative amounts of the components in the mixture and the ranges of temperatures or other parameters recited in the other method examples.
The invention provides a photocatalytic environment-friendly coating for purifying air pollutants, which comprises the following components in percentage by mass: 1-8% of visible light response photocatalytic material, 5-20% of environment-friendly emulsion, 10-25% of filler, 1-5% of dispersing agent, 0.5-1% of film-forming assistant, 0.2-1% of thickening agent, 0.2-0.5% of flatting agent, 0.1-0.5% of defoaming agent, 0.5-1% of pigment and 38-80.5% of solvent.
The photocatalytic coating provided by the invention has the characteristics of easily available raw materials, simple process and environment-friendly preparation, can be widely applied to the field of purifying pollutants such as ozone, NOx and the like, and can be applied to indoor and outdoor outer walls, and the coating has good waterproofness, weather resistance, anti-crusting property, high-efficiency and stable photocatalytic performance and cyclicity.
In order to realize the technical scheme of the invention, the photocatalytic coating adopts a nano photocatalytic material with visible light response, and the long-acting property of the coating under weak light and natural illumination can be improved by applying the nano photocatalytic material to the formula of the water-based coating.
In particular, the photocatalytic material in the present invention may be selected from C3N4Doped C3N4Composite C3N4And one or more of nano bismuth-based oxides. Wherein, doped C3N4The doped elements comprise one or more of non-metal elements, alkali metal elements and alkaline earth metal elements, such as C, O, N, K, Na, Ca, Mg and the like. Compound C3N4Can be selected from TiO2/C3N4polyaniline/C3N4graphene/C3N4、GO/C3N4、SiO2/C3N4、BiOCl/C3N4、Fe3O4/C3N4、ZnO/C3N4And the like. The nanometer bismuth-based oxide can be selected from BiOCl and (BiO)2CO3BiOBr, BiOI, etc.
In this embodiment, the photocatalytic material is preferably C3N4Or doped C3N4Or of compound C3N4Due to C3N4The material is a visible light response photocatalysis material and can be excited under the condition of illumination, and the generated photoproduction electrons and photoproduction holes react with oxygen and water molecules in the air to form superoxide radicals and hydroxyl radicals with extremely strong oxidizing power. The formed free radical can react with ozone and NOxAir pollutants such as formaldehyde and VOCs undergo redox reaction, and harmful gas pollutants react into water and carbon dioxide, so that the effect of degrading the pollutants is achieved, and the purpose of air purification is achieved. And C3N4The catalytic condition is mild, catalytic reaction can be carried out under the illumination condition of visible light (400-750 nm), and the catalytic reaction can be applied to the formula of the water-based paint, so that the purification capability of the paint under the illumination can be improved, and the catalytic reaction can be widely applied to ozone and NOxAnd VOC and other pollutants, and the application scenes comprise building interior walls and exterior walls.
Specifically, the environment-friendly emulsion in the invention is one or more of water-based silicone acrylic emulsion, water-based polyacrylic emulsion, water-based acrylic resin dispersion, water-based acrylic resin aqueous solution water-based styrene-acrylic emulsion, water-based acrylic emulsion, polyurethane emulsion, silicate solution, water-based silicone resin and the like, wherein the silicate comprises aluminum silicate, iron silicate, calcium silicate, magnesium silicate, potassium silicate and sodium silicate. The main function of the environment-friendly emulsion is to form a film on the formed coating and improve the uniformity of the coating.
The filler is one or more of calcium carbonate (heavy calcium and light calcium), silicon dioxide, kaolin, diatomite, wollastonite, talcum powder, white carbon black, graphite, barite, titanium dioxide, sepiolite, alumina powder, glass powder, asbestos powder, mica powder, quartz powder, precipitated barium sulfate, wollastonite, bentonite, shell powder and diatom ooze. The main functions of the filler are represented in the following aspects:
1. plays roles of framework and filling in the coating; 2. adjusting the rheological property of the coating; 3. improved wear resistance and durability; 4. adjusting the optical performance; 5. the weather resistance is improved; the production cost is reduced;
from the above, it is known that the filler plays an important role in the coating, and therefore the specific gravity of the filler affects the properties of the coating.
The solvent is hydrosolvent or silica sol or low-concentration ethanol, the material is easy to obtain, and the cost is low.
The auxiliary agent is one or more of film forming auxiliary agent, dispersant, flatting agent, defoaming agent, thickening agent and the like.
The dispersant is mainly used for dispersing materials, so that the uniformity of a coating film is improved;
the film-forming auxiliary agent is mainly used for improving the film-forming effect of a coating film;
the thickener is mainly used for adjusting the consistency of the paint and meeting different spraying conditions;
the leveling agent is mainly used for promoting the coating to form a flat, smooth and uniform coating film in the drying film-forming process, can effectively reduce the surface tension of the coating brushed on the surface of an object, improve the leveling property and uniformity of the coating, improve the permeability of the coating, reduce the possibility of generating spots and stains when the coating is brushed, increase the coverage property and enable the film to be formed uniformly and naturally;
the main function of the defoaming agent is to reduce the surface tension of water, solutions, suspensions, etc., to prevent the formation of foam, or to reduce or eliminate the original foam.
The pigment is an inorganic pigment and comprises one or more of metal oxide, chromate, carbonate, sulfate, sulfide and the like. Such as aluminum powder, copper powder, carbon black, zinc white, titanium white, chrome yellow, iron blue, cadmium red, cadmium yellow, lithopone, carbon black, iron oxide red, iron oxide yellow and the like. The primary function of the pigment is to color and provide different color choices for the coating.
The photocatalytic coating provided by the invention has the characteristics of easily available raw materials, simple process and environmental protection in preparation, and has good waterproofness, weather resistance, anti-crusting property, high-efficiency and stable photocatalytic performance and cyclicity.
In another aspect, the present invention further provides a preparation method of a photocatalytic environment-friendly coating for air pollutant purification, which is shown in fig. 1 and comprises the following steps:
s1: weighing the raw material components for preparing the photocatalytic environment-friendly coating according to the proportion, and mixing the photocatalytic material and the emulsion at a constant speed and uniformly stirring to obtain a first mixed solution;
s2: mixing and soaking the filler and the solvent to obtain a second mixed solution;
s3: adding the second mixed solution into the first mixed solution, and uniformly stirring at a constant speed to obtain a third mixed solution;
s4: adding a dispersing agent, a film forming auxiliary agent, a flatting agent and a defoaming agent into the third mixed solution, and uniformly stirring at a constant speed to obtain a fourth mixed solution; and
s5: and adding the pigment and the thickening solution into the fourth mixed solution in sequence, and uniformly stirring at a constant speed to obtain the photocatalytic environment-friendly coating.
Specifically, the rotation speed of the mechanical stirring is 200-.
The photocatalytic environment-friendly coating prepared by the preparation method provided by the invention has the advantages of simple preparation process and excellent photocatalytic performance, can improve the air purification capacity of the coating under illumination, and has the advantage of environmental friendliness because the raw materials for preparing the photocatalytic environment-friendly coating cannot pollute the environment.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
The starting materials used in the following examples are all commercially available, unless otherwise specified. The following examples were conducted by applying the prepared coating material on a transparent glass plate, after the coating material was completely dried, forming a coating layer on the transparent glass plate, and subjecting the coating material to ozone and NOxAnd testing VOCs to verify the performance of the coating.
FIG. 1 shows the ozone degradation rates of the samples of examples 1-3, which all exceed 85% in 1 hour, wherein the degradation effect of example 1 is obvious, and the degradation rate is 97.7%. FIG. 2 is the NO of the samples of examples 1-3xDegradation rate, NOxThe degradation rate of the resin in 30 minutes is over 50 percent, wherein the degradation effect of the resin in example 1 is obvious. Table 1 shows the degradation rates of VOCs, and that example had degradation rates of 89.9%, 81.7%, and 75.3% in 48 hours.
Example 1
The photocatalytic environment-friendly coating is prepared from the following raw materials in percentage by weight:
5% of a photocatalytic material, 10% of an environment-friendly emulsion, 15% of a filler, 2.5% of a dispersant, 0.5% of a film-forming assistant, 1% of a thickening agent, 0.5% of a leveling agent, 0.5% of a defoaming agent, 0.5% of a pigment and the balance of a solvent.
The photocatalytic material is characterized in that the photocatalytic material is a photocatalytic material comprising C3N4Doped C3N4Composite C3N4One or more of nano bismuth series oxide, preferably C3N4。
The environment-friendly emulsion is water-based silicone-acrylate emulsion;
the filler is wollastonite and coarse whiting powder, and the mass ratio of the wollastonite to the coarse whiting powder is 1: 1, adding;
the dispersant is sodium hexametaphosphate;
the film-forming additive is decaglycol ester;
the thickening agent is sodium polyacrylate;
the leveling agent is powder leveling agent RB 505;
the defoaming agent is polysiloxane defoaming agent;
the pigment is titanium white;
the solvent is water;
the preparation method of the photocatalytic coating provided by the invention comprises the following preparation steps:
s1: weighing each raw material component for preparing the photocatalytic environment-friendly coating according to the proportion, and mixing 5% of photocatalytic material and 10% of environment-friendly emulsion at a constant speed and uniformly stirring to obtain a first mixed solution;
s2: mixing and soaking 15% of filler and 64.5% of water to obtain a second mixed solution;
s3: adding the second mixed solution into the first mixed solution, and mechanically stirring uniformly for 0.5 hour to obtain a third mixed solution;
s4: adding 2.5% of dispersing agent, 0.5% of film forming additive, 0.5% of flatting agent and 0.5% of defoaming agent into the third mixed solution, and mechanically stirring uniformly for 0.5 hour to obtain a fourth mixed solution; and
s5: and sequentially adding 0.5% of pigment and 1% of thickening agent into the fourth mixed solution, and uniformly stirring at a constant speed to obtain the photocatalytic environment-friendly coating.
Example 2
The photocatalytic environment-friendly coating is prepared from the following raw materials in percentage by weight:
2% of photocatalytic material, 15% of environment-friendly emulsion, 16% of filler, 1% of dispersing agent, 0.5% of film-forming assistant, 0.2% of thickening agent, 0.2% of flatting agent, 0.1% of defoaming agent, 0.5% of pigment and the balance of solvent.
The photocatalytic material is characterized in that the photocatalytic material is a photocatalytic material comprising C3N4Doped C3N4Composite C3N4One or more of nanometer bismuth series oxide, ZnO/C is preferable3N4。
The environment-friendly emulsion is water-based polyacrylic emulsion;
the filler is sepiolite and heavy calcium carbonate powder, and the mass ratio of the filler to the filler is 3: 2, adding;
the dispersant is sodium hexametaphosphate;
the film-forming assistant is glycol;
the thickening agent is bentonite;
the flatting agent is polydimethylsiloxane;
the defoaming agent is fatty glyceride;
the pigment is iron oxide yellow;
the solvent is water;
the preparation method of the photocatalytic coating provided by the invention comprises the following preparation steps:
s1: weighing each raw material component for preparing the photocatalytic environment-friendly coating according to the proportion, and mixing 2% of photocatalytic material and 15% of environment-friendly emulsion at a constant speed and stirring uniformly to obtain a first mixed solution;
s2: mixing and soaking 15% of filler and 64.5% of water to obtain a second mixed solution;
s3: adding the second mixed solution into the first mixed solution, and mechanically stirring uniformly for 0.5 hour to obtain a third mixed solution;
s4: adding 1% of dispersing agent, 0.5% of film forming additive, 0.2% of flatting agent and 0.1% of defoaming agent into the third mixed solution, and mechanically stirring uniformly for 0.5 hour to obtain a fourth mixed solution; and
s5: and sequentially adding 0.5% of pigment and 0.2% of thickening agent into the fourth mixed solution, and uniformly stirring at a constant speed to obtain the photocatalytic environment-friendly coating.
Example 3
The photocatalytic environment-friendly coating is prepared from the following raw materials in percentage by weight:
8% of photocatalytic material, 20% of environment-friendly emulsion, 25% of filler, 5% of dispersing agent, 1% of film-forming assistant, 0.2% of thickening agent, 0.2% of flatting agent, 0.1% of defoaming agent, 1% of pigment and the balance of solvent.
The photocatalytic material is characterized in that the photocatalytic material is a photocatalytic material comprising C3N4Doped C3N4Composite C3N4One or more of nano bismuth series oxide, SiO is preferred2/C3N4。
The environment-friendly emulsion is water-based pure acrylic emulsion;
the filler is diatomite and heavy calcium powder, and the mass ratio is 1: 1, adding;
the dispersant is sodium hexametaphosphate;
the film-forming additive is dodecyl alcohol ester;
the thickening agent is hydroxyethyl cellulose;
the flatting agent is polydimethylsiloxane;
the defoaming agent is fatty glyceride;
the pigment is iron oxide red;
the solvent is a mixed solution of low-concentration ethanol and water;
the preparation method of the photocatalytic coating provided by the invention comprises the following preparation steps:
s1: weighing the raw material components for preparing the photocatalytic environment-friendly coating according to the proportion, mixing 8% of photocatalytic material and 20% of environment-friendly emulsion, stirring, mixing and uniformly stirring to obtain a first mixed solution;
s2: mixing and soaking 25% of filler, 39.5% of low-concentration ethanol and water to obtain a second mixed solution;
s3: adding the second mixed solution into the first mixed solution, and mechanically stirring uniformly for 0.5 hour to obtain a third mixed solution;
s4: adding 1% of dispersing agent, 0.5% of film forming additive, 0.2% of flatting agent and 0.1% of defoaming agent into the third mixed solution, and mechanically stirring uniformly for 0.5 hour to obtain a fourth mixed solution; and
s5: and sequentially adding 1% of pigment and 0.2% of thickening agent into the fourth mixed solution, and uniformly stirring at a constant speed to obtain the photocatalytic environment-friendly coating.
In other embodiments, the paint was also subjected to VOCs testing to verify the performance of the paint.
The specific test results can be found in Table 1.
Serial number Contamination to be measured Time of illumination Initial concentration End concentration Purification efficiency
1 VOCs 48 hours 4.95mg/m3 0.5mg/m3 89.9％
2 VOCs 48 hours 4.92mg/m3 0.9mg/m3 81.7％
3 VOCs 48 hours 4.86mg/m3 1.2mg/m3 75.3％
TABLE 1
According to the test steps and parameters of the embodiment, the photocatalytic environment-friendly coating prepared by the preparation method provided by the invention can be seen to be resistant to ozone and NOxAnd pollutants such as VOCs (volatile organic compounds) and the like have good removal rate, excellent visible light catalytic performance, good photochemical stability and high thermal stability, and are beneficial to application in practice. And because the preparation conditions are mild and simple, the photocatalytic activity is excellent, the industrial production can be realized, and the photocatalyst can be widely used in the field of air purification.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims (10)

1. The photocatalytic environment-friendly coating for purifying air pollutants is characterized by comprising the following components in percentage by mass: 1-8% of visible light response photocatalytic material, 5-20% of environment-friendly emulsion, 10-25% of filler, 1-5% of dispersing agent, 0.5-1% of film-forming assistant, 0.2-1% of thickening agent, 0.2-0.5% of flatting agent, 0.1-0.5% of defoaming agent, 0.5-1% of pigment and 38-80.5% of solvent.
2. The photocatalytic environment-friendly coating for air pollutant purification according to claim 1, characterized in that the photocatalytic material is C3N4Doped C3N4Composite C3N4And one or more of nanometer bismuth series oxides.
3. The photocatalytic eco-friendly coating for air pollutant purification according to claim 2, characterized in that the doped C is3N4The doped elements comprise one or more of non-metal elements, alkali metal elements and alkaline earth metal elements.
4. The photocatalytic environment-friendly coating for air pollutant purification according to claim 1, wherein the environment-friendly emulsion is one or more of water-based silicone acrylic emulsion, water-based polyacrylic emulsion, water-based acrylic resin dispersion, water-based styrene acrylic emulsion of acrylic resin aqueous solution, water-based acrylic emulsion, polyurethane emulsion, silicate solution and water-based silicone resin.
5. The photocatalytic environment-friendly coating for purifying air pollutants as claimed in claim 1, wherein the filler is one or more of calcium carbonate, silica, kaolin, diatomite, wollastonite, talcum powder, white carbon black, graphite, barite, titanium dioxide, sepiolite, alumina powder, glass powder, asbestos powder, mica powder, quartz powder, precipitated barium sulfate, shell powder, diatom ooze, wollastonite and bentonite.
6. The photocatalytic environment-friendly coating for air pollutant purification according to claim 1, is characterized in that the solvent is water solvent or silica sol or low-concentration ethanol.
7. The photocatalytic environment-friendly coating for purifying air pollutants as claimed in claim 1, wherein the auxiliary agent is one or more of a film forming auxiliary agent, a dispersing agent, a leveling agent, a defoaming agent and a thickening agent.
8. The photocatalytic environment-friendly coating for air pollutant purification according to claim 1, is characterized in that the pigment is an inorganic pigment comprising one or more of metal oxide, chromate, carbonate, sulfate and sulfide.
9. A method for preparing the photocatalytic environmental protection coating for air pollutant purification according to any one of claims 1 to 8, comprising the steps of:
weighing the raw material components for preparing the photocatalytic environment-friendly coating according to the proportion, and mixing the photocatalytic material and the emulsion at a constant speed and uniformly stirring to obtain a first mixed solution;
mixing and soaking the filler and the solvent to obtain a second mixed solution;
adding the second mixed solution into the first mixed solution, and mechanically and uniformly stirring to obtain a third mixed solution;
adding a dispersing agent, a film forming auxiliary agent, a flatting agent and a defoaming agent into the third mixed solution, and mechanically and uniformly stirring to obtain a fourth mixed solution;
and adding the pigment and the thickening solution into the fourth mixed solution in sequence, and uniformly stirring at a constant speed to obtain the photocatalytic environment-friendly coating.
10. The method as claimed in claim 9, wherein the rotation speed of the mechanical stirring is 200-800r/min, and the stirring time is 0.5-2 h.
CN202010983446.6A 2020-09-17 2020-09-17 Photocatalytic environment-friendly coating for purifying air pollutants and preparation method thereof Pending CN112266666A (en)

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