CN111423804A - Broad-spectrum long-acting antibacterial water-based environment-friendly coating and preparation method thereof - Google Patents
Broad-spectrum long-acting antibacterial water-based environment-friendly coating and preparation method thereof Download PDFInfo
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- 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
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- 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
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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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- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
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- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
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Abstract
The invention relates to a broad-spectrum long-acting antibacterial water-based environment-friendly coating and a preparation method thereof, wherein the coating comprises the following materials in parts by weight: 20-50 parts of water-based acrylic emulsion, 30-60 parts of water-based polyurethane dispersion emulsion, 0.1-5 parts of surface auxiliary agent, 1-15 parts of film-forming auxiliary agent, 0.5-5 parts of nano-silver bactericide, 0.5-5 parts of nano-zinc antibacterial agent, 0.5-5 parts of DCOIT bactericide, 0.5-0.8 part of organic guanidine antibacterial agent, 0.4-0.6 part of chitosan antibacterial agent, 0.5-3 parts of zeolite powder, 3-5 parts of organic silicon waterproof agent, 0.2-1 part of nonionic dispersant, 5-30 parts of reverse osmosis deionized water, 0.1-2 parts of anti-settling agent, 0.1-1 part of thickening agent and 5-10 parts of pigment and filler, the water-based acrylic emulsion and the water-based polyurethane dispersion emulsion are used as film forming substances, are matched with a film forming auxiliary agent to add a preferable environment-friendly high-performance bactericide, have obvious antibacterial and bactericidal effects, the antibacterial coating is enhanced in the aspects of bactericides and aqueous polyurethane dispersion emulsion, so that the antibacterial function of the coating is increased on the performance of the original aqueous coating.
Description
Technical Field
The invention belongs to the technical field of water-based paint, and particularly relates to broad-spectrum long-acting antibacterial water-based environment-friendly paint and a preparation method thereof.
Background
The chemical structure of silver determines that the silver has higher catalytic capability, and the reduction potential of the silver in a high oxidation state is extremely high enough to generate atomic oxygen in the surrounding space. The atomic oxygen has strong oxidizing property and can sterilize, and the nano silver particles enter the thallus to be combined with oxygen metabolizing enzyme (-SH), so that the thallus is choked to death by a unique action mechanism, and most of microbes such as bacteria, fungi, mold, spores and the like which are contacted with the thallus can be killed. The research of domestic authorities discovers that: it has comprehensive antibacterial activity on drug-resistant pathogenic bacteria such as drug-resistant Escherichia coli, drug-resistant Staphylococcus aureus, drug-resistant Pseudomonas aeruginosa, Streptococcus pyogenes, drug-resistant enterococcus, anaerobe, etc.; has antibacterial effect on bacteria such as Staphylococcus aureus, Escherichia coli, Pseudomonas aeruginosa, Candida albicans and other G + and G-type pathogenic bacteria on the surface of burn, scald and wound; the sterilization agent also has strong sterilization effect on chlamydia trachomatis and gonococcus causing sexually transmitted diseases; the nano silver particles have super-strong permeability, can quickly permeate into subcutaneous tissues for 2mm sterilization, and have good sterilization effect on deeper tissue infection caused by common bacteria, stubborn bacteria, drug-resistant bacteria and fungi. Can kill 650 kinds of bacteria, and has broad-spectrum bactericidal effect and no drug resistance.
When zinc ions with positive charges contact with bacteria, the cell walls of the bacteria are mostly negative charges, and tension is generated under the condition that the amounts of the positive ions and the negative ions are unbalanced, so that the cell walls of the bacteria are broken to generate broken holes, and cell walls cannot be synthesized to influence propagation; the coating can effectively prevent the aging of the coating, improve the sanitary safety of products, has high-efficiency broad-spectrum antibacterial and mildew-proof effects, is insensitive to ultraviolet irradiation, does not corrode various metal materials, does not generate electric corrosion, does not volatilize, does not chemically react with most substances (except organic matters and inorganic matters and compounds capable of reducing silver), can be suitable for the coating fields of refrigerators, washing machines, air conditioners, water dispensers, telephones, textiles, shoes, floors, coatings, paints, pipes, ceramics, building materials, automobiles and the like, can meet the requirements of various transparent, natural and common coatings, meets the processing process requirements of various products, has the antibacterial validity period equal to the service life of the products, has no influence on the appearance of the products, has excellent color stability, safety and reliability, and because the antibacterial products adopt the complexing technology, metal ions are tightly complexed by organic macromolecules, the overflow is avoided, and the safety performance is reliable.
The chitosan antibacterial agent is a quaternized derivative of water-soluble chitosan, can be adsorbed on a bacterial cell membrane through electrostatic attraction to form a porous membrane, destroys the permeability of the cell membrane, prevents the cell membrane from normally absorbing nutrient substances, pumps out harmful substances and destroys the integrity of the cell membrane, and causes the exosmosis of substances in cells; chitosan with relative molecular mass less than 5000Da can diffuse into microorganism, and can inhibit mRNA synthesis under the action of DNA and other electronegative substances to destroy normal physiological activity; the chitosan has high nitrogen content and strong chelating ability, can be selectively combined with some trace metals, and can inhibit the generation of bacterial toxins and the propagation of bacteria; the actual antimicrobial process is a combination of one or more of these mechanisms, and their antimicrobial activity is related to a number of factors, such as the degree of deacetylation, relative molecular mass, pH, metal ion, ionic strength, and the like. The cell membrane and the cell wall are composed of phospholipid bilayers and have negative charges, and when bacteria are contacted with objects treated by cationic compounds, the bacteria with negative ionic charges can be attracted by cations, so that the free movement of the bacteria is restrained, the respiratory mechanism of the bacteria is inhibited, namely contact death occurs, and the antibacterial and bactericidal effects are realized.
The organic guanidine antibacterial agent as a natural biological antibacterial agent is a cationic surfactant, is easy to dissolve in water, has no bubbles in water solution, and is convenient for field application. The sterilization mechanism of the microbial cell is mainly that the microbial cell has positive charges in aqueous solution, can be adsorbed on the surface of microorganisms to form micelles, and gradually permeates into a lipid layer and a protein layer of microbial cell plasma, so that the permeability of cell membranes is changed, cell contents are caused to permeate outwards, and the microorganisms are killed; at the same time, it can coagulate proteins, denature enzymes and structural proteins, thus destroying the metabolic system of the microorganism, leading to its death. The alkyl biguanide has the characteristics of antibiosis and sterilization, and has an inhibiting effect on microorganisms; the chitosan is a polysaccharide product extracted from shells of marine organisms and crustaceans, and oligosaccharide with the polymerization degree of 2-15 is produced after enzymolysis, so that the chitosan is a bactericide capable of inducing plants to produce disease-resistant factors, is a component used by the conventional bactericide at present, and enables biological bacteria and viruses to be incapable of surviving after being added, so that the antibacterial variety is more comprehensive.
The DCOIT isothiazolinone derivative can inhibit and kill bacteria, fungi, mold and other microbes quickly and irreversibly, and can effectively control the algae propagation and slime growth in water. The coating is easy to degrade under the use concentration, does not contain heavy metal and is environment-friendly; can effectively kill green micro-bacteria, basidiomycetes, aspergillus niger, fusarium, curvularia, green mucor and the like, and can replace organic arsenic compounds with huge toxicity.
The water paint is a safe and environment-friendly paint, the low VOC emission of the water paint reduces the pollution to the atmosphere, reduces the dangers of flammability, explosiveness and the like in the transportation and storage processes, and improves the construction safety. Compared with solvent-based coatings, the water-based coatings have great superiority in energy conservation and environmental protection. However, the existing antibacterial coating still has practical application and technical defects, and generally has poor antibacterial effect, narrow antibacterial range and unstable storage, so that the popularization and application of the antibacterial coating are limited. How to use the nano silver ion bactericide to be compounded and dispersed in the aqueous polyurethane dispersion emulsion and extract the optimal formula and manufacturing process from a large number of experiments to achieve the multifunctional balance of antibiosis, environmental protection, stability, long-acting and coating performance is a product and a method which are urgently needed in the aspect of resisting new coronavirus at present and can become a long-acting antibacterial coating used for daily contact articles on various substrates such as metal, plastic, wood and the like.
Although the technologies of using the above bactericides respectively are continuously appeared in the prior art, the bactericides are all single-property bactericides, have small and non-durable killing power on viruses and bacteria, especially have no bactericidal function on exposed areas such as wall surfaces and ground surfaces of public places and families, or have single bactericidal effect, and even if the single bactericides are used for killing bacteria and viruses in some places, the bactericides have poor water resistance, durability and high-temperature and high-humidity environment resistance, and cannot bring about comprehensive bactericidal effect.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a broad-spectrum long-acting antibacterial aqueous environment-friendly coating which is prepared by compounding and dispersing a nano silver ion bactericide, a nano zinc antibacterial agent, a DCOIT bactericide, an organic guanidine antibacterial agent and a chitosan antibacterial agent into an aqueous polyurethane dispersion emulsion and an aqueous acrylic emulsion to achieve the effects of antibiosis, environmental protection, stability, long acting and coating performance and a preparation method thereof.
The purpose of the invention is realized as follows:
the broad-spectrum long-acting antibacterial water-based environment-friendly coating is characterized by comprising the following materials in parts by weight: 20-50 parts of water-based acrylic emulsion, 30-60 parts of water-based polyurethane dispersion emulsion, 0.1-5 parts of surface auxiliary agent, 1-15 parts of film-forming auxiliary agent, 0.5-5 parts of nano-silver bactericide, 0.5-5 parts of nano-zinc antibacterial agent, 0.5-5 parts of DCOIT bactericide, 0.5-0.8 part of organic guanidine antibacterial agent, 0.4-0.6 part of chitosan antibacterial agent, 0.5-3 parts of zeolite powder, 3-5 parts of organic silicon waterproof agent, 0.2-1 part of nonionic dispersing agent, 5-30 parts of reverse osmosis deionized water, 0.1-2 parts of anti-settling agent, 0.1-1 part of thickening agent and 5-10 parts of pigment and filler.
The nano-silver bactericide is a colorless transparent nano-silver solution with the particle size of 25 nanometers.
The nano zinc antibacterial agent is a colorless transparent nano zinc solution with the particle size of 25 nanometers.
The film-forming auxiliary agent is one or a combination of more of alcohol ether and alcohol ester film-forming substances in any ratio.
The surface auxiliary agent is at least one or a combination of a plurality of water-based organic silicon defoaming agent, a leveling agent and a base material wetting agent in any ratio.
The zeolite powder is natural zeolite powder with fineness less than 8 microns and prepared by grinding natural zeolite rocks.
The DCOIT bactericide is isothiazolinone derivative 4, 5-dichloro-N-octyl-4-isothiazolinone-3-ketone.
The thickener is at least one or a combination of a plurality of polyurethane associative rheological additives in any ratio.
The preparation method of the broad-spectrum long-acting antibacterial water-based environment-friendly coating is characterized by comprising the following steps:
step 1), in a dispersing device, ensuring the dispersing speed to be 500r/min, sequentially adding an aqueous acrylic emulsion, an aqueous polyurethane dispersion emulsion, a half amount of surface auxiliary agent and a film forming auxiliary agent, and dispersing at a high speed of 800-1200 r/min for 20-30min to obtain a first mixed solution;
step 2), uniformly mixing and dispersing the nano-silver antibacterial agent, the nano-zinc antibacterial agent, the DCOIT bactericide, the zeolite powder and the non-ionic dispersing agent, and then grinding the mixed solution by a sand mill until the fineness is less than 8 microns; obtaining a second mixed solution;
step 3), uniformly dispersing the organic guanidine antibacterial agent and the chitosan antibacterial agent at the rotating speed of 800-1000 rpm for 5-8 minutes to obtain a third mixed solution;
step 4), uniformly mixing the first mixed solution, the second mixed solution and the third mixed solution, adding reverse osmosis deionized water and an organic silicon waterproof agent, sequentially adding the rest of the surface auxiliary agent, the thickening agent, the anti-settling agent and the pigment and filler into the slurry at a stirring speed of 500-800 r/min, and dispersing at a high speed to a uniform and stable state;
and 5) sampling to test basic performance, and filtering and packaging the qualified product.
The invention has the following beneficial effects: the water-based environment-friendly antibacterial coating prepared by taking the water-based acrylic emulsion and the water-based polyurethane dispersion emulsion as main film forming substances and matching with a proper film forming auxiliary agent and adding a preferable environment-friendly high-performance bactericide has remarkable bacteriostatic and bactericidal effects. The invention enhances the aspects of bactericide, aqueous polyurethane dispersion emulsion and surface auxiliary agent, and increases the antibacterial function of the finished paint and coating on the original performance of the aqueous paint by optimizing the manufacturing process, and specifically comprises the following steps:
1. the invention skillfully selects zeolite powder to integrate antibacterial agents such as a nano-silver antibacterial agent, a nano-zinc antibacterial agent, a DCOIT antibacterial agent, an organic guanidine antibacterial agent, a chitosan antibacterial agent and the like, utilizes the better adsorbability and ion exchange property of the zeolite powder to play a combined role in the whole sterilization process as a good carrier of an ion antibacterial agent, realizes the broad-spectrum antibacterial effect by the combination and collocation and mutual cooperation of the composite antibacterial agents and the zeolite transfer and integration, has strong compatibility, and can effectively kill bacteria, fungi, viruses, algae and the like.
2. The organosilicon waterproofing agent is added in the formula, and has excellent waterproof and synergistic effects, so that the organosilicon waterproofing agent can play a very good role in waterproofing and synergistic effects, and the organosilicon waterproofing agent further improves the sterilization effects of the five bactericides on the basis of the whole antibacterial sterilization, so that the synergistic effect of the organosilicon waterproofing agent also plays a decisive role in the invention.
3. The invention is a composite antibacterial composition type; the characteristics of high temperature resistance and rapid sterilization of nano silver ions are utilized; the slow antibacterial but wide characteristic of nano zinc ions is utilized; the characteristics of safety, wide application, environmental protection and biological property of guanidine and chitose antibacterial agents are utilized; the DCOIT isothiazolinone derivative can quickly and irreversibly inhibit and kill microbes such as bacteria, fungi, mold and the like, effectively controls the propagation of algae and the growth of slime and dust in water, and is more suitable for being used on walls; the waterproof synergistic effect of the organosilicon waterproofing agent is utilized; the characteristic of strong long-acting adsorption capacity of the superfine zeolite powder is utilized; the water-based emulsion carrier film-forming property, stability, environmental protection and safety characteristics are utilized to form a comprehensive antibacterial film-forming coating product which has the advantages of comprehensive aspects, high efficiency, wide application range, capability of utilizing physical, biological and chemical properties of viruses and bacteria and the like to physically resist positive and negative charges, long-acting and lasting chemical properties, high temperature resistance, wide application range, water resistance and synergy, and capability of avoiding loopholes caused by various bacteria and viruses, and is suitable for being coated and used on various articles, walls, floors and the like.
The detection report shows that the bacteriostasis rate and the sterilization rate of the product on escherichia coli, staphylococcus aureus and candida albicans are 99.9%, and the product has strong lasting bacteriostasis effect and sterilization effect. The invention can influence the bacteriostasis rate effect of the invention by arbitrarily removing one of the antibacterial components.
Detailed Description
For a better understanding of the present invention, the technical solutions and performances of the present invention are described in detail below with reference to specific examples.
Example 1: the broad-spectrum long-acting antibacterial water-based environment-friendly coating comprises the following components in parts by weight: 20g of aqueous acrylic emulsion (DOW 3311), 50g of aqueous polyurethane dispersion emulsion (DSM R2180), 3g of surface additives (TEGO 810, 760, 270, 100), 3g of film forming additive (DOW DPNB), 0.5g of nano-silver bactericide (76000-ag +25), 0.5g of nano-zinc antibacterial agent, 1.5g of DCOIT bactericide (HENCIDE DC 30), 0.5g of organic guanidine antibacterial agent, 0.4g of chitosan antibacterial agent, 0.5g of zeolite powder, 3g of organic silicon waterproof agent, 0.2g of nonionic dispersant, 21g of reverse osmosis deionized water, 0.1g of anti-settling agent, 0.1g of thickener (DOE2020), and 5g of pigment filler.
Example 2: the water-based environment-friendly antibacterial multifunctional coating comprises the following components in parts by weight: 30g of aqueous acrylic emulsion (DOW 3311), 40g of aqueous polyurethane dispersion emulsion (DSM R2180), 3g of surface additives (TEGO 810, 760, 270 and 100), 3g of film-forming additive (DOW DPNB), 0.5g of nano-silver bactericide (76000-ag +25), 0.5g of nano-zinc antibacterial agent, 1.5g of DCOIT bactericide (HENCIDE DC 30), 0.5g of organic guanidine antibacterial agent, 0.5g of chitosan antibacterial agent, 1.5g of zeolite powder, 4g of organosilicon waterproofing agent, 0.8g of nonionic dispersant, 26g of reverse osmosis deionized water, 0.8g of anti-settling agent, 0.2g of thickener (DOE2020) and 8g of pigment filler.
Example 3: the water-based environment-friendly antibacterial multifunctional coating comprises the following components in parts by weight: 50g of aqueous acrylic emulsion (DOW 3311), 30g of aqueous polyurethane dispersion emulsion (DSM R2180), 5g of surface additives (TEGO 810, 760, 270, 100), 5g of film forming additive (DOW DPNB), 1.5g of nano-silver bactericide (76000-ag +25), 1.5g of nano-zinc antibacterial agent, 0.5g of DCOIT bactericide (HENCIDE DC 30), 0.8g of organic guanidine antibacterial agent, 0.6g of chitosan antibacterial agent, 2.5 g of zeolite powder, 2g of organosilicon waterproof agent, 0.6g of nonionic dispersant, 28g of reverse osmosis deionized water, 0.6g of anti-settling agent, 0.6g of thickener (DOE2020), and 5g of pigment filler.
Example 4: the water-based environment-friendly antibacterial multifunctional coating comprises the following components in parts by weight: 20g of aqueous acrylic emulsion (DOW 3311), 60g of aqueous polyurethane dispersion emulsion (DSM R2180), 3g of surface additives (TEGO 810, 760, 270, 100), 3g of film forming additive (DOW DPNB), 5g of nano-silver bactericide (76000-ag +25), 5g of nano-zinc antibacterial agent, 1.5g of DCOIT bactericide (HENCIDE DC 30), 0.8g of organic guanidine antibacterial agent, 0.6g of chitosan antibacterial agent, 3g of zeolite powder, 5g of organosilicon waterproof agent, 1g of nonionic dispersant, 11g of reverse osmosis deionized water, 2g of anti-settling agent, 1g of thickener (DOE2020), and 5g of pigment filler.
Example 5: the water-based environment-friendly antibacterial multifunctional coating comprises the following components in parts by weight: 30g of aqueous acrylic emulsion (DOW 3311), 50g of aqueous polyurethane dispersion emulsion (DSM R2180), 4g of surface additives (TEGO 810, 760, 270 and 100), 4g of film forming additive (DOW DPNB), 0.5g of nano-silver bactericide (76000-ag +25), 0.5g of nano-zinc antibacterial agent, 0.5g of DCOIT bactericide (HENCIDE DC 30), 0.5g of organic guanidine antibacterial agent, 0.5g of chitosan antibacterial agent, 2g of zeolite powder, 4g of organosilicon waterproofing agent, 1g of nonionic dispersing agent, 10g of reverse osmosis deionized water, 1g of anti-settling agent, 1g of thickening agent (2020) and 6g of pigment and filler.
Example 6: the water-based environment-friendly antibacterial multifunctional coating comprises the following components in parts by weight: 40g of aqueous acrylic emulsion (DOW 3311), 40g of aqueous polyurethane dispersion emulsion (DSM R2180), 5g of surface additives (TEGO 810, 760, 270, 100), 5g of film forming additive (DOW DPNB), 1g of nano-silver bactericide (76000-ag +25), 1g of nano-zinc antibacterial agent, 1g of DCOIT bactericide (HENCIDE DC 30), 0.5g of organic guanidine antibacterial agent, 0.5g of chitosan antibacterial agent, 2g of zeolite powder, 3g of silicone waterproof agent, 1g of nonionic dispersing agent, 8g of reverse osmosis deionized water, 1g of anti-settling agent, 1g of thickening agent (DOE2020), and 7g of pigment filler.
The preparation method of the broad-spectrum long-acting antibacterial water-based environment-friendly coating comprises the following steps:
step 1), in a dispersing device, ensuring the dispersing speed to be 500r/min, sequentially adding an aqueous acrylic emulsion, an aqueous polyurethane dispersion emulsion, a half amount of surface auxiliary agent and a film forming auxiliary agent, and dispersing at a high speed of 800-1200 r/min for 20-30min to obtain a first mixed solution;
step 2), uniformly mixing and dispersing the nano-silver antibacterial agent, the nano-zinc antibacterial agent, the DCOIT bactericide, the zeolite powder and the non-ionic dispersing agent, and then grinding the mixed solution by a sand mill until the fineness is less than 8 microns; obtaining a second mixed solution;
step 3), uniformly dispersing the organic guanidine antibacterial agent and the chitosan antibacterial agent at the rotating speed of 800-1000 rpm for 5-8 minutes to obtain a third mixed solution;
step 4), uniformly mixing the first mixed solution, the second mixed solution and the third mixed solution, adding reverse osmosis deionized water and an organic silicon waterproof agent, sequentially adding the rest of the surface auxiliary agent, the thickening agent, the anti-settling agent and the pigment and filler into the slurry at a stirring speed of 500-800 r/min, and dispersing at a high speed to a uniform and stable state;
and 5) sampling to test basic performance, and filtering and packaging the qualified product.
By adopting the broad-spectrum long-acting antibacterial water-based environment-friendly coating of the embodiment, the plate-making test performance under the room temperature condition in a laboratory is shown as the following table:
the results of the antibacterial tests for examples 1-6 are given in the following table:
the results of the film performance tests for examples 1-6 are shown in the following table:
the detection methods refer to GB/T21866-2008, GB/T23999-2009, HG/T21866-2008, HG/T4317-2012 and HG/T3590-2007 detection methods.
The invention adds surface auxiliary agent, film forming auxiliary agent, zeolite powder, thickening agent, organosilicon waterproofing agent, anti-settling agent, pigment and filler, reverse osmosis deionized water for optimization and reinforcement in the proportion of aqueous acrylic emulsion, aqueous polyurethane dispersion emulsion, nano silver antibacterial agent, nano zinc antibacterial agent, DCOIT bactericide, organic guanidine antibacterial agent and chitosan antibacterial agent.
The film-forming resin is a combination of water-based acrylic emulsion (DOW 3311) and water-based polyurethane dispersion emulsion (DOW 3311, DSMR2180 and Houxian 1920), and the surface auxiliary agent is one or more combinations of a water-based organic silicon defoamer, a leveling agent and a substrate wetting agent (TEGO-270, 810100 and 747). The film forming auxiliary agent is one or a combination of more of alcohol ether and alcohol ester (DOW-DPM, DPNB, Texanol-12) film forming substances. The nano silver bactericide is colorless transparent nano silver solution (76000-ag + 25). The DCOIT bactericide is isothiazolinone derivatives (HENCIDE DC 30), and the reverse osmosis deionized water is self-made second-level osmosis deionized water. The thickener is at least one or more of polyurethane associated rheological additives (DOW2020 and PUR 40).
Claims (9)
1. The broad-spectrum long-acting antibacterial water-based environment-friendly coating is characterized by comprising the following materials in parts by weight: 20-50 parts of water-based acrylic emulsion, 30-60 parts of water-based polyurethane dispersion emulsion, 0.1-5 parts of surface auxiliary agent, 1-15 parts of film-forming auxiliary agent, 0.5-5 parts of nano-silver bactericide, 0.5-5 parts of nano-zinc antibacterial agent, 0.5-5 parts of DCOIT bactericide, 0.5-0.8 part of organic guanidine antibacterial agent, 0.4-0.6 part of chitosan antibacterial agent, 0.5-3 parts of zeolite powder, 3-5 parts of organic silicon waterproof agent, 0.2-1 part of nonionic dispersing agent, 5-30 parts of reverse osmosis deionized water, 0.1-2 parts of anti-settling agent, 0.1-1 part of thickening agent and 5-10 parts of pigment and filler.
2. The broad-spectrum long-acting antibacterial water-based environment-friendly coating as claimed in claim 1, wherein the nano-silver bactericide is a colorless transparent nano-silver solution with a particle size of 25 nm.
3. The broad-spectrum long-acting antibacterial water-based environment-friendly coating as claimed in claim 1, wherein the nano zinc antibacterial agent is a colorless transparent nano zinc solution with a particle size of 25 nm.
4. The broad-spectrum long-acting antibacterial water-based environment-friendly coating as claimed in claim 1, wherein the film-forming assistant is one or a combination of more of alcohol ether and alcohol ester film-forming substances in any ratio.
5. The broad-spectrum long-acting antibacterial water-based environment-friendly coating as claimed in claim 1, wherein the surface auxiliary agent is at least one or a combination of more of a water-based silicone defoamer, a leveling agent and a substrate wetting agent in any ratio.
6. The broad-spectrum long-acting antibacterial water-based environment-friendly coating as claimed in claim 1, wherein the zeolite powder is natural zeolite powder with fineness less than 8 μm, which is prepared by grinding natural zeolite rock.
7. The broad-spectrum long-acting antibacterial water-based environment-friendly coating material as claimed in claim 1, wherein the DCOIT bactericide is isothiazolinone derivative 4, 5-dichloro-N-octyl-4-isothiazolin-3-one.
8. The broad-spectrum long-acting antibacterial aqueous environment-friendly paint according to claim 1, wherein the thickener is a polyurethane associated rheological aid which is at least one or a combination of more than one of the rheological aids in any ratio.
9. The preparation method of the broad-spectrum long-acting antibacterial water-based environment-friendly coating according to any one of claims 1 to 8, characterized by comprising the following steps:
step 1), in a dispersing device, ensuring the dispersing speed to be 500r/min, sequentially adding an aqueous acrylic emulsion, an aqueous polyurethane dispersion emulsion, a half amount of surface auxiliary agent and a film forming auxiliary agent, and dispersing at a high speed of 800-1200 r/min for 20-30min to obtain a first mixed solution;
step 2), uniformly mixing and dispersing the nano-silver antibacterial agent, the nano-zinc antibacterial agent, the DCOIT bactericide, the zeolite powder and the non-ionic dispersing agent, and then grinding the mixed solution by a sand mill until the fineness is less than 8 microns; obtaining a second mixed solution;
step 3), uniformly dispersing the organic guanidine antibacterial agent and the chitosan antibacterial agent at the rotating speed of 800-1000 rpm for 5-8 minutes to obtain a third mixed solution;
step 4), uniformly mixing the first mixed solution, the second mixed solution and the third mixed solution, adding reverse osmosis deionized water and an organic silicon waterproof agent, sequentially adding the rest of the surface auxiliary agent, the thickening agent, the anti-settling agent and the pigment and filler into the slurry at a stirring speed of 500-800 r/min, and dispersing at a high speed to a uniform and stable state;
and 5) sampling to test basic performance, and filtering and packaging the qualified product.
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