CN110527367B - Indoor visible light long-acting antibacterial water-based paint - Google Patents
Indoor visible light long-acting antibacterial water-based paint Download PDFInfo
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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
- C09D125/00—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 an aromatic carbocyclic ring; Coating compositions based on derivatives of such polymers
- C09D125/02—Homopolymers or copolymers of hydrocarbons
- C09D125/04—Homopolymers or copolymers of styrene
- C09D125/08—Copolymers of styrene
- C09D125/14—Copolymers of styrene with unsaturated esters
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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
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- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/08—Anti-corrosive paints
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/14—Paints containing biocides, e.g. fungicides, insecticides or pesticides
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Abstract
The invention belongs to the technical field of environmental purification and coating chemical industry, and provides an indoor visible light long-acting antibacterial water-based coating which can effectively inhibit the growth of microorganisms under the irradiation of indoor visible light and purify indoor harmful gas, wherein nano active ingredients of the indoor visible light long-acting antibacterial water-based coating can be fully and tightly bonded with inner wall latex, and the indoor visible light long-acting antibacterial water-based coating has better construction performance and durability. Using refined nano bentonite and acylation to modify nano C3N4Adding various additives and styrene-acrylic emulsion into a matrix according to a certain mass ratio, and stirring and dispersing the matrix in water at a high speed to obtain the uniform water-based paint. The coating is easy to construct, has good durability, can effectively utilize indoor visible light resources, has the functions of purifying indoor pollutants and inhibiting the growth of microorganisms, and is particularly suitable for places with high exposure risks, such as medical institutions, biological research and the like.
Description
Technical Field
The invention belongs to the technical field of environmental purification and coating chemical industry, and particularly relates to an indoor visible light long-acting antibacterial water-based coating.
Background
The social development is so far, the expectation of people on the interior wall coating is not limited to basic requirements such as decoration, the idea of pursuing healthy life is widely permeated into various industries, and meanwhile, the specialized customized application provides higher standards for the research and development of novel coatings. Especially, in medical institutions, biological research and other indoor places, the exposure risk of bacteria and viruses is far higher than that of common places, and conventional means such as chemical disinfection reagents, ultraviolet sterilization and the like are generally adopted to reduce the infection probability. However, these methods do not have long-lasting effect, and require a professional cleaner to maintain the antibacterial and antivirus effects through frequent and repeated daily operations.
Various effective components for bacteriostasis and disinfection are introduced into the paint production process to obtain the indoor building material with bacteriostasis function, which can meet the customization requirements of specialized places. The active ingredients of the paint are generally plant essential oil, biomacromolecule, organic bactericide, quaternary ammonium salt, clay mineral, metal ion or oxide and the like, wherein the biomass or organic bacteriostatic agent has obvious effect, but is easy to volatilize, the components are easy to change, and the bacteriostatic action of the inorganic bacteriostatic agent is reduced along with the saturation of the adsorption capacity. And the visible light in the room is utilized to provide lasting energy for bacteriostasis and degradation reaction, so that the long-acting bacteriostasis effect can be achieved, and even the indoor pollutants are gradually degraded into micromolecule or low-toxicity substances.
In the photocatalytic coating, active ingredients capable of absorbing and converting photon energy play a key role. Titanium oxide, which was originally found to be useful for photocatalytic decontamination and bacterial inhibition, is also the only commercially available photocatalytic active ingredient, and many photocatalytic coatings, tiles, plates, etc. on the market contain the active ingredient. However, titanium oxide only absorbs ultraviolet light which occupies a very small proportion of sunlight remarkably, and indoor long-time ultraviolet irradiation is not good for health, so that other visible light catalysts must be screened to directly utilize indoor abundant visible light as a light source of the photocatalytic coating.
Obtaining nonmetal carbon nitride (g-C) with graphite-like structure by thermal polymerization of downstream cyanamide products from fertilizer enterprises3N4) Can absorb and utilize visible light, and has excellent thermal stability, acid and alkali resistance and corrosion resistance. The material is considered to be a novel material for producing hydrogen by photolysis of water and providing new energy, and has the functions of purifying pollution and inhibiting bacteria. There have been considerable attempts to incorporate them into the production of bacteriostatic coatings, for example in g-C by Linlin et al3N4Preparation method and application of modified waterborne polyurethane antibacterial coating (Linlin, Yuanlu, Cuichi. by adsorbing curry grass, Eucalyptus citriodora or Pravalia ussuriensis essential oil) mixed into waterborne polyurethane coating [ P]CN 106221540B; a modified waterborne resin compositionPreparation method and application of polyurethane antibacterial film [ P]CN 106221538B; preparation method and application of nano composite material modified waterborne polyurethane antibacterial coating of Linlin, Yuanluo and Cuihui]CN 106349902B) in g-C3N4With TiO2Compounding into a Fluorocarbon Resin coating (Tian Yu, Zhou Feng, Zhan Su, et al. mechanization on the catalysis of fluorine Resin Coatings, Enhanced by g-C)3N4/TiO2[J]Journal of organic and organic Polymers and Materials, 2017, 27(1):353-]CN 102702807B) or a coating mixed with diatom ooze (Jinlingyun, Luoyun macro, a photocatalytic composite coating and a preparation method thereof [ P]CN 102702807B; xuzizhen, Malun Sheng, Liupeng, etc. one kind of visible light catalyzing diatom ooze paint]CN 109796179A), in g-C3N4Compounding with graphene, and mixing with epoxy resin coating (Heyi, Chenchunling, Staphne, etc.. g-C3N4Preparation method of (E) -G/waterborne epoxy composite coating [ P ]]CN 108624195A), in g-C3N4A water-based photocatalytic material sol and a preparation method thereof [ P ] are disclosed, wherein the water-based photocatalytic material sol is compounded with graphene and cerium oxide/silver salt and is prepared into a sprayable photocatalytic sol by means of alkyl ammonium chloride (stupid, Zhang Yuan, Liu Yi, and the like)]. CN 109201114A）。
The inorganic component and the organic polymer are required to be fully and tightly bonded to prepare the high-quality inorganic-organic composite coating, and although the product has the bacteriostatic ability by utilizing visible light, the compatibility of inorganic carbon nitride powder and the organic polymer is not considered during production, so that the risk of uneven distribution and easy peeling loss of effective components during later construction and cleaning is caused.
Disclosure of Invention
Aiming at the technical defects, the invention provides the indoor visible light long-acting antibacterial water-based paint which can effectively inhibit the growth of microorganisms and purify indoor harmful gas under the irradiation of indoor visible light, the nanometer effective components of the paint can be fully and tightly bonded with the latex of the inner wall, and the paint has better construction performance and durability.
The invention is realized by the following technical scheme: the visible light long-acting bacteriostatic water-based paint for indoor use is prepared from the following raw materials in percentage by mass: 12-16% of refined nano bentonite and acylation modified nano g-C3N415-20 percent of styrene-acrylic emulsion, 30-35 percent of styrene-acrylic emulsion, 25-30 percent of water, 4.6-6.4 percent of filler, 0.3-0.5 percent of dispersant, 0.2-0.4 percent of defoaming agent, 0.8-1.2 percent of film-forming additive, 0.6-0.8 percent of thickening agent and 0.5-0.7 percent of flatting agent.
The preparation method of the refined nano bentonite comprises the following steps: mixing bentonite and 0.5-2% hydrogen peroxide by mass concentration by a wet grinding method, and ball-milling for 5-10h, wherein the mass ratio of feed liquid is 1: 5-10, washing, filtering and drying to obtain nano bentonite; dispersing nano bentonite in a toluene solvent, wherein the mass ratio of feed liquid is 1: 20-50, taking bentonite as a reference, adding 0.1-0.3 part by mass of allyl silane coupling agent, refluxing, stirring and reacting for 8-12h, washing, filtering and drying to obtain the refined nano bentonite.
The particle size of the refined nano bentonite is 80-200 nm.
The acylation modified nano g-C3N4The preparation method comprises the following steps:
1) preparation of g-C by thermal polymerization3N4: using urea as raw material, placing the urea in a closed crucible, and carrying out thermal polymerization in a muffle furnace at the temperature of 550-650 ℃ for 2-4h to obtain light yellow g-C3N4；
2) Ball milling refining of nano g-C3N4: wet grinding the g-C prepared in the previous step3N4Mixing the mixture with 0.05-0.1mol/L sodium bicarbonate solution, and ball-milling for 5-10h, wherein the mass ratio of the material liquid is 1: 5-10, washing, filtering and drying to obtain nano g-C3N4；
3) Acylation modified nano g-C3N4: nano g-C3N4Adding the modified nano g-C into acryloyl chloride with equal mass parts at normal temperature, stirring and reacting for 18-24h, washing, filtering and drying to obtain the modified nano g-C3N4。
The urea is replaced by cyanamide or melamine.
The acylation modified nano g-C3N4The particle size is 50-100 nm.
The styrene-acrylic emulsion is replaced by pure acrylic emulsion or vinyl acetate-acrylic emulsion. The filler consists of heavy calcium carbonate, calcined kaolin and talcum powder, and the mass ratio of the heavy calcium carbonate to the calcined kaolin to the talcum powder is 1: 0.5-0.7: 0.2-0.4. The dispersing agent is polyvinyl alcohol; the defoaming agent is polyether organic silicon; the film-forming additive is 2,2, 4-trimethyl-1, 3-pentanediol monoisobutyrate; the neutralizing agent is dimethyl alcohol amine or sodium acetate; the leveling agent is polyacrylate; the thickening agent is hydroxyethyl cellulose sodium.
The method for preparing the indoor visible light long-acting antibacterial water-based paint comprises the steps of refining nano bentonite and acylating and modifying nano g-C3N4Sequentially adding a dispersing agent, a defoaming agent, a film-forming assistant and a filler as a matrix, stirring and dispersing in water at 1000-2000 r/min to obtain uniform sol, then adding a styrene-acrylic emulsion, adjusting the pH to 8-9, finally adding a leveling agent and a thickening agent, continuously stirring, standing and aging to obtain the visible light long-acting antibacterial water-based paint for indoor use.
Compared with the prior art, the invention has the following beneficial effects: the bentonite and the carbon nitride with purifying and bacteriostasis properties belong to inorganic powder materials, grow in a high-temperature environment, are acid-resistant and corrosion-resistant, but have poor compatibility with organic polymer emulsion, and are not beneficial to construction and long-term use by direct addition.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
The above-described aspects of the present invention are further illustrated by the following specific examples, which should not be construed as limiting the scope of the above-described subject matter of the present invention to the examples below. All the technologies realized based on the above contents of the present invention belong to the scope of the present invention, and the following embodiments are all completed by adopting the conventional prior art except for the specific description.
Example 1: the visible light long-acting bacteriostatic water-based paint for indoor use comprises the following components in percentage by mass: 12 percent of refined nano bentonite and acylation modified nano g-C3N415 percent of styrene-acrylic emulsion, 35 percent of water, 4.6 percent of filler, 0.3 percent of dispersant, 0.4 percent of defoaming agent, 1.2 percent of film-forming additive, 0.8 percent of thickening agent and 0.7 percent of flatting agent.
The specific preparation steps of the refined nano bentonite are as follows:
1) ball milling nanometer bentonite: mixing bentonite and 0.5% hydrogen peroxide solution by mass concentration by a wet grinding method, ball-milling for 5h with the feed liquid mass ratio of 1/10, washing, filtering and drying to obtain nano bentonite;
2) refining the nano bentonite: dispersing nano bentonite in a toluene solvent, wherein the mass ratio of the material liquid is 1/20, adding 0.1 part by mass of allyl silane coupling agent based on the bentonite, refluxing, stirring and reacting for 8 hours, washing, filtering and drying to obtain refined nano bentonite; the particle size of the refined nano bentonite is 80-200 nm.
Acylation modified nano g-C3N4The specific preparation steps are as follows:
1) preparation of g-C by thermal polymerization3N4: using urea as raw material, placing in a closed crucible, and thermally polymerizing for 4h in a muffle furnace at 550 ℃ to obtain light yellow g-C3N4；
2) Ball milling refining of nano g-C3N4: wet grinding the g-C prepared in the previous step3N4Mixing with 0.1mol/L sodium bicarbonate solution, ball milling for 5h with the material liquid mass ratio of 1/5, washing, filtering and drying to obtain nano g-C3N4；
3) Acylation modified nano g-C3N4: nano g-C3N4Adding the modified nano g-C into acryloyl chloride with equal mass parts at normal temperature, stirring and reacting for 18-24h, washing, filtering and drying to obtain the modified nano g-C3N4(ii) a Acylation modified nano g-C3N4The particle size is 50 to 100 nm.
The styrene-acrylic emulsion can also be replaced by pure acrylic emulsion or vinyl acetate-acrylic emulsion; the filler consists of heavy calcium carbonate, calcined kaolin and talcum powder, and the mass ratio is 1/0.5/0.2; the dispersant is preferably polyvinyl alcohol; the defoaming agent is preferably polyether organic silicon; the film-forming assistant is preferably 2,2, 4-trimethyl-1, 3-pentanediol monoisobutyrate; the neutralizing agent is preferably dimethyl alcohol amine or sodium acetate; the leveling agent is preferably polyacrylate; the thickener is preferably sodium hydroxyethyl cellulose.
The preparation method of the indoor visible light long-acting antibacterial water-based paint comprises the following steps: uses refined nano bentonite and acylation to modify nano g-C3N4Sequentially adding a dispersing agent, a defoaming agent, a film-forming assistant and a filler as a matrix, stirring and dispersing in water at 1000-2000 r/min to obtain uniform sol, then adding a styrene-acrylic emulsion, adjusting the pH to 8-9, finally adding a leveling agent and a thickening agent, continuously stirring, standing and aging to prepare the visible light catalyzed indoor long-acting antibacterial water-based paint, and sealing and storing.
Example 2: the visible light long-acting bacteriostatic water-based paint for indoor use comprises the following components in percentage by mass: refined nano bentonite 15%, acylation modified nano g-C3N418 percent of styrene-acrylic emulsion, 32 percent of water, 27 percent of filler, 0.4 percent of dispersant, 0.3 percent of defoaming agent, 1.0 percent of film-forming additive, 0.7 percent of thickening agent and 0.6 percent of flatting agent.
The specific preparation steps of the refined nano bentonite are as follows:
1) ball milling nanometer bentonite: mixing bentonite and 1.5% hydrogen peroxide solution by mass concentration by a wet grinding method, ball-milling for 8h with the feed liquid mass ratio of 1/8, washing, filtering and drying to obtain nano bentonite;
2) refining the nano bentonite: dispersing nano bentonite in a toluene solvent, wherein the mass ratio of the material liquid is 1/35, adding 0.2 part by mass of allyl silane coupling agent based on the bentonite, refluxing, stirring and reacting for 10 hours, washing, filtering and drying to obtain refined nano bentonite; the particle size is 80-200 nm.
Acylation modified nano g-C3N4The specific preparation steps are as follows:
1) preparation of g-C by thermal polymerization3N4: taking cyanamide as a raw material, placing the cyanamide in a closed crucible, and thermally polymerizing for 3h in a muffle furnace at the temperature of 600 ℃ to obtain light yellow g-C3N4；
2) Ball milling refining of nano g-C3N4: wet grinding the g-C prepared in the previous step3N4Mixing with 0.08 mol/L sodium bicarbonate solution, ball milling for 8h with the mass ratio of the feed liquid being 1/8, washing, filtering and drying to obtain nano g-C3N4；
3) Acylation modified nano g-C3N4: nano g-C3N4Adding the modified nano g-C into acryloyl chloride with equal mass parts at normal temperature, stirring and reacting for 18-24h, washing, filtering and drying to obtain the modified nano g-C3N4(ii) a The particle size is 50 to 100 nm.
The styrene-acrylic emulsion can also be replaced by pure acrylic emulsion or vinyl acetate-acrylic emulsion; the filler consists of heavy calcium carbonate, calcined kaolin and talcum powder, and the mass ratio is 1/0.6/0.3; the dispersant is preferably polyvinyl alcohol; the defoaming agent is preferably polyether organic silicon; the film-forming assistant is preferably 2,2, 4-trimethyl-1, 3-pentanediol monoisobutyrate; the neutralizing agent is preferably dimethyl alcohol amine or sodium acetate; the leveling agent is preferably polyacrylate; the thickener is preferably sodium hydroxyethyl cellulose.
The preparation method of the indoor visible light long-acting bacteriostatic water-based paint is the same as that described in example 1.
Example 3: the visible light long-acting bacteriostatic water-based paint for indoor use comprises the following components in percentage by mass: refined nano bentonite 16%, acylation modified nano g-C3N420 percent of styrene-acrylic emulsion, 30 percent of water, 25 percent of filler, 6.4 percent of dispersant, 0.5 percent of defoaming agent, 0.8 percent of film-forming additive, 0.6 percent of thickening agent and 0.5 percent of flatting agent.
The specific preparation steps of the refined nano bentonite are as follows:
1) ball milling nanometer bentonite: mixing bentonite and hydrogen peroxide with the mass concentration of 2% by a wet grinding method, ball-milling for 10 hours, wherein the mass ratio of feed liquid is 1/5, washing, filtering and drying to obtain nano bentonite;
2) refining the nano bentonite: dispersing nano bentonite in a toluene solvent, wherein the mass ratio of the material liquid is 1/50, adding 0.3 part by mass of allyl silane coupling agent based on the bentonite, refluxing, stirring and reacting for 12 hours, washing, filtering and drying to obtain refined nano bentonite; the particle size is 80-200 nm.
Acylation modified nano g-C3N4The specific preparation steps are as follows:
1) preparation of g-C by thermal polymerization3N4: melamine is used as a raw material, placed in a closed crucible, and thermally polymerized in a muffle furnace at 650 ℃ for 2h to obtain light yellow g-C3N4；
2) Ball milling refining of nano g-C3N4: wet grinding the g-C prepared in the previous step3N4Mixing with 0.05mol/L sodium bicarbonate solution, ball milling for 10h with the mass ratio of the feed liquid being 1/10, washing, filtering and drying to obtain nano g-C3N4；
3) Acylation modified nano g-C3N4: nano g-C3N4Adding the modified nano g-C into acryloyl chloride with equal mass parts at normal temperature, stirring and reacting for 18-24h, washing, filtering and drying to obtain the modified nano g-C3N4(ii) a The particle size is 50 to 100 nm.
The styrene-acrylic emulsion can also be replaced by pure acrylic emulsion or vinyl acetate-acrylic emulsion; the filler consists of heavy calcium carbonate, calcined kaolin and talcum powder, and the mass ratio is 1/0.7/0.4; the dispersant is preferably polyvinyl alcohol; the defoaming agent is preferably polyether organic silicon; the film-forming assistant is preferably 2,2, 4-trimethyl-1, 3-pentanediol monoisobutyrate; the neutralizing agent is preferably dimethyl alcohol amine or sodium acetate; the leveling agent is preferably polyacrylate; the thickener is preferably sodium hydroxyethyl cellulose.
The preparation method of the indoor visible light long-acting bacteriostatic water-based paint is the same as that described in example 1.
Comparative example: the water-based paint without the effective matrix is used as a contrast, and the raw materials are as follows: the composite material comprises the following components in percentage by mass: 40% of styrene-acrylic emulsion, 35% of water, 21.4% of filler, 0.5% of dispersing agent, 0.4% of defoaming agent, 1.2% of film-forming assistant, 0.8% of thickening agent and 0.7% of flatting agent. The method comprises the following steps: sequentially adding a dispersing agent, a defoaming agent, a film-forming assistant and a filler, stirring and dispersing in water at 1000-2000 r/min to obtain uniform sol, then adding a styrene-acrylic emulsion, adjusting the pH to 8-9, finally adding a leveling agent and a thickening agent, continuously stirring, standing and aging to prepare the visible light catalyzed indoor long-acting antibacterial water-based paint, and sealing and storing.
The styrene-acrylic emulsion can also be replaced by pure acrylic emulsion or vinyl acetate-acrylic emulsion; the filler consists of heavy calcium carbonate, calcined kaolin and talcum powder, and the mass ratio is 1/0.7/0.4; the dispersant is preferably polyvinyl alcohol; the defoaming agent is preferably polyether organic silicon; the film-forming assistant is preferably 2,2, 4-trimethyl-1, 3-pentanediol monoisobutyrate; the neutralizing agent is preferably dimethyl alcohol amine or sodium acetate; the leveling agent is preferably polyacrylate; the thickener is preferably sodium hydroxyethyl cellulose.
The visible light long-acting bacteriostatic water-based paint for indoor use, which is prepared by the invention, samples in example 3 are randomly taken for routine detection. As shown in Table 1, the effective ingredient matrix was uniformly dissolved in the emulsion by the refining and modifying method of the present invention, and no agglomeration was observed from the preparation to the application, and the emulsion had a smooth and thin appearance and a good gloss.
TABLE 1 results of conventional paint testing
The antibacterial tests of the examples and the comparative examples are carried out according to the national standards HG/T3950 and 2007 antibacterial paint and GB/T21866 and 2008 antibacterial paint (paint film) determination method and antibacterial effect. The concrete measures are as follows:
1) respectively coating the coatings prepared in the above embodiments and the comparative examples on test plates, wherein the coating thickness is 0.5mm, drying, cutting the test plates into test plates with the thickness of 50mm multiplied by 50mm, and sterilizing for 5min on an ultra-clean workbench by using an ultraviolet sterilizing lamp for later use;
2) culturing and diluting fresh activated strain with nutrient broth NB/normal saline, and selecting bacteria solution with concentration of (5.0-10.0) × 105 For testing cfu/mL solution, the method is operated according to GB 4789.2 determination of total number of bacterial colonies for food hygiene microbiological examination;
3) respectively dripping 0.5ml of test bacterium liquid on a test plate, clamping a sterilization cover film with sterilization forceps to cover the test plate so as to enable the test bacterium liquid to be flat and bubble-free, placing the test bacterium liquid in a sterilization culture dish, transferring the test bacterium liquid to a biochemical incubator, arranging an 80-100W LED lamp in the sterilization culture dish, and illuminating for 3-5 hours under the conditions of (37 +/-1) DEG C and relative humidity RH being more than 90%;
4) after the light irradiation is finished, the test plate and the cover film are washed by 20mL of physiological saline, the washing solution is inoculated into an agar medium NA, and after the culture is carried out for 24 hours at the temperature of (37 +/-1), the counting is carried out according to GB 4789.2 'determination of total number of bacterial colonies for food hygiene microbiological examination'.
The antibacterial rate of the coating is calculated according to the following formula: r (%) = (No-Ne)/No × 100%;
in the formula:
r is the antibacterial rate (%), and the numerical value is three-digit effective number;
no-average number of recovered bacteria (cfu/plate) after 24 hours in the control group;
ne-average number of bacteria recovered (cfu/patch) after 24h in the antibacterial group.
The negative group test plate is not added with any coating, the control group test plate is not added with effective substrate components, and the implementation group test plate is coated with the coating containing refined nano bentonite and acylation modified nano C3N4The results of all bacteriostatic properties tests are shown in table 2. Through comparison, the coatings of all the examples have long-acting antibacterial performance, the negative group without the coatings shows no antibacterial activity, and the antibacterial performance of the common coatings without the effective matrix components is not up to the standard.
TABLE 2 coating bacteriostatic property test results
Claims (10)
1. The long-acting antibacterial water-based paint for indoor visible light is characterized in that: the coating is prepared from the following raw materials in percentage by mass: 12-16% of refined nano bentonite and acylation modified nano g-C3N415-20 percent of styrene-acrylic emulsion, 30-35 percent of styrene-acrylic emulsion, 25-30 percent of water, 4.6-6.4 percent of filler, 0.3-0.5 percent of dispersant, 0.2-0.4 percent of defoaming agent, 0.8-1.2 percent of film-forming additive, 0.6-0.8 percent of thickening agent and 0.5-0.7 percent of flatting agent;
the preparation method of the refined nano bentonite comprises the following steps: mixing bentonite and 0.5-2% hydrogen peroxide by mass concentration by a wet grinding method, and ball-milling for 5-10h, wherein the mass ratio of feed liquid is 1: 5-10, washing, filtering and drying to obtain nano bentonite; dispersing nano bentonite in a toluene solvent, wherein the mass ratio of feed liquid is 1: 20-50, taking bentonite as a reference, adding 0.1-0.3 part by mass of allyl silane coupling agent, refluxing, stirring and reacting for 8-12h, washing, filtering and drying to obtain the refined nano bentonite.
2. The visible light long-acting bacteriostatic water-based paint for indoor use according to claim 1, characterized in that: the particle size of the refined nano bentonite is 80-200 nm.
3. The visible light long-acting bacteriostatic water-based paint for indoor use according to claim 1, characterized in that: the acylation modified nano g-C3N4The preparation method comprises the following steps:
1) preparation of g-C by thermal polymerization3N4: using urea as raw material, placing the urea in a closed crucible, and carrying out thermal polymerization in a muffle furnace at the temperature of 550-650 ℃ for 2-4h to obtain light yellow g-C3N4；
2) Ball milling refining of nano g-C3N4: wet grinding the g-C prepared in the previous step3N4Mixing the mixture with 0.05-0.1mol/L sodium bicarbonate solution, and ball-milling for 5-10h, wherein the mass ratio of the material liquid is 1: 5-10, washing, filtering and drying to obtain nano g-C3N4；
3) Acylation modified nano g-C3N4: nano g-C3N4Adding the modified nano g-C into acryloyl chloride with equal mass parts at normal temperature, stirring and reacting for 18-24h, washing, filtering and drying to obtain the modified nano g-C3N4。
4. The visible light long-acting bacteriostatic water-based paint for indoor use according to claim 3, characterized in that: the urea is replaced by cyanamide.
5. The visible light long-acting bacteriostatic water-based paint for indoor use according to claim 4, characterized in that: the urea is replaced by melamine.
6. The visible light long-acting bacteriostatic water-based paint for indoor use according to claim 3, characterized in that: the acylation modified nano g-C3N4The particle size is 50-100 nm.
7. The visible light long-acting bacteriostatic water-based paint for indoor use according to claim 1, characterized in that: the styrene-acrylic emulsion is replaced by pure acrylic emulsion or vinyl acetate-acrylic emulsion.
8. The visible light long-acting bacteriostatic water-based paint for indoor use according to claim 1, characterized in that: the filler consists of heavy calcium carbonate, calcined kaolin and talcum powder, and the mass ratio of the heavy calcium carbonate to the calcined kaolin to the talcum powder is 1: 0.5-0.7: 0.2-0.4.
9. The visible light long-acting bacteriostatic water-based paint for indoor use according to claim 1, characterized in that: the dispersing agent is polyvinyl alcohol; the defoaming agent is polyether organic silicon; the film-forming additive is 2,2, 4-trimethyl-1, 3-pentanediol monoisobutyrate; the leveling agent is polyacrylate; the thickening agent is hydroxyethyl cellulose sodium.
10. The method for preparing the indoor visible light long-acting bacteriostatic water-based paint as claimed in claim 1, which is characterized by comprising the following steps: uses refined nano bentonite and acylation to modify nano g-C3N4Sequentially adding a dispersing agent, a defoaming agent, a film-forming assistant and a filler as a matrix, stirring and dispersing in water at 1000-2000 r/min to obtain uniform sol, then adding a styrene-acrylic emulsion, adjusting the pH value to 8-9, finally adding a leveling agent and a thickening agent, continuously stirring, standing and aging to obtain the visible light long-acting antibacterial water-based paint for indoor use.
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