CN111876041A - Antibacterial waterproof coating for building exterior wall and preparation method thereof - Google Patents
Antibacterial waterproof coating for building exterior wall and preparation method thereof 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
- 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
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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
- 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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- 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
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/16—Antifouling paints; Underwater paints
- C09D5/1656—Antifouling paints; Underwater paints characterised by the film-forming substance
- C09D5/1662—Synthetic film-forming substance
- C09D5/1675—Polyorganosiloxane-containing compositions
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- 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
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/16—Antifouling paints; Underwater paints
- C09D5/1687—Use of special additives
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- 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
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- 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
- C08K2003/2296—Oxides; Hydroxides of metals of zinc
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- 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
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
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- 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
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
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Abstract
The invention discloses an antibacterial waterproof coating for building exterior walls, which is prepared from the following raw materials in parts by weight: 50-60 parts of silicone-acrylic emulsion, 8-10 parts of perfluorosiloxane resin, 3-4 parts of modified filler, 2-3 parts of hydroxyethyl cellulose, 0.5-0.7 part of chlorinated paraffin, 0.3-0.4 part of ammonium trimolybdate and 0.6-1 part of auxiliary agent; the invention also discloses a preparation method of the antibacterial waterproof coating. According to the invention, the silicone-acrylate solution and the perfluorosiloxane resin are adopted as film forming substances of the coating, so that a film forming matrix of the coating has good waterproof and self-cleaning properties; by adding the modified filler into the coating, the filler can be uniformly dispersed in the coating after being modified, so that the stable reinforcing and antibacterial properties can be exerted, and the filler can migrate to the surface of the coating, so that the compactness and hydrophobicity of the coating are improved, and the waterproof and anticorrosive properties of the coating are further improved; the obtained paint has antibacterial and waterproof functions and is suitable for coating building outer walls.
Description
Technical Field
The invention belongs to the technical field of building coatings, and particularly relates to an antibacterial waterproof coating for an exterior wall of a building and a preparation method thereof.
Background
In recent years, with the rapid development of the real estate industry, the demand of exterior wall coatings is increasing, and the requirements of people on the appearance of buildings are also continuously improved. Different areas have larger difference of environmental conditions, and for some cities with heavy industry and developed mining industry, the coating can lose the original decorative effect due to more dust and other suspended substances in the atmosphere. The coating applied to the outer wall concrete or the outer wall panel is exposed in the atmospheric environment and can lose the original decorative effect by the phenomena of pulverization, discoloration, peeling, stains and the like of the coating after natural changes of weather such as wind, sunshine, rain and the like, thereby influencing the appearance beauty of the building. In addition, the outer wall coating can easily absorb moisture in the air to cause the moisture content on the surface of the material to be continuously increased, and after the humidity reaches more than 30%, a proper environment is provided for the growth and the propagation of algae, so that bacteria are bred on the outer wall, and the attractiveness and the using effect of the outer wall coating are influenced.
At present, the performance of the paint for the external wall panel is improved mainly from the aspects of screening, mutual dispersion and stability of emulsion, filler and auxiliary agent, and the Chinese patent with the patent number of CN03118029.9 discloses a multifunctional nano building external wall paint and a preparation method thereof. However, the application adopts more inorganic nano-fillers, and the inorganic nano-fillers have the defects of easy agglomeration and poor compatibility with coating film-forming substances, so that the application still has great improvement space.
Disclosure of Invention
The invention aims to provide an antibacterial waterproof coating for building exterior walls and a preparation method thereof, wherein a silicone-acrylic solution and perfluorosiloxane resin are adopted as film forming substances of the coating, the silicone-acrylic emulsion has hydrophobicity and low surface energy and is not easy to pollute, and the perfluorosiloxane resin has the characteristics of antifouling, waterproofing and the like, so that a film forming matrix of the coating has good waterproof and self-cleaning properties; by adding the modified filler into the coating, the filler can be uniformly dispersed in the coating after being modified, so that the stable reinforcing and antibacterial properties can be exerted, and the filler can migrate to the surface of the coating, so that the compactness and hydrophobicity of the coating are improved, and the waterproof and anticorrosive properties of the coating are further improved; the obtained coating with antibacterial and waterproof functions is suitable for coating the outer wall of a building, and can play a good antibacterial and waterproof effect, so that the protection and the aesthetic property of the outer wall of the building are improved; in addition, the preparation method of the coating is simple in process, low in cost and suitable for large-scale production.
The purpose of the invention can be realized by the following technical scheme:
an antibacterial waterproof coating for building exterior walls is prepared from the following raw materials in parts by weight: 50-60 parts of silicone-acrylic emulsion, 8-10 parts of perfluorosiloxane resin, 3-4 parts of modified filler, 2-3 parts of hydroxyethyl cellulose, 0.5-0.7 part of chlorinated paraffin, 0.3-0.4 part of ammonium trimolybdate and 0.6-1 part of auxiliary agent;
the antibacterial waterproof coating is prepared by the following steps:
firstly, mixing silicone-acrylate emulsion, perfluoro-siloxane resin, hydroxyethyl cellulose and half of auxiliary agent according to parts by weight, adding the mixture into a stirring kettle, and stirring the mixture for 20 to 30 minutes at the stirring speed of 350r/min at normal temperature to obtain a base material;
and secondly, adding the chlorinated paraffin, the ammonium trimolybdate, the modified filler and the rest half of the auxiliary agent into the base material, stirring and mixing at the rotating speed of 500r/min for 40-50min at normal temperature, and then increasing the rotating speed to 2000r/min for stirring and mixing for 8-10min to obtain the antibacterial waterproof coating.
Further, the auxiliary agent comprises a film-forming auxiliary agent, a dispersing agent, a thickening agent and a mildew preventive, wherein the mass ratio of the film-forming auxiliary agent to the matting agent to the dispersing agent to the mildew preventive is 10:8-9:10-12: 3-4; the film-forming assistant is a compound of dodecyl glycol ester and dipropylene glycol butyl ether, and the mass ratio of the dodecyl glycol ester to the dipropylene glycol butyl ether is 1: 1; the dispersing agent is one or more of hydrophobic modified carboxylic acid sodium salt, polyacrylic acid sodium salt or ammonium salt; the thickening agent is one or more of diatomite, sodium bentonite, polyurethane, polyvinyl alcohol or polyacrylamide; the mildew preventive is a compound obtained by isothiazolinone bactericide, pentachlorophenol and tetrachloroisophthalonitrile according to the mass ratio of 10:3-4: 2-3.
Further, the modified filler is prepared by the following method:
1) uniformly mixing nano zinc oxide, nano titanium dioxide and kaolin according to a mass ratio of 1:1:2, dispersing the mixture into n-hexane according to a solid-liquid ratio of 1g:10mL, magnetically stirring for 30-40min, and then carrying out ultrasonic treatment for 10-15min to obtain a dispersion liquid;
2) dissolving tributyl chlorosilane in normal hexane to form a modification liquid with the mass fraction of 12%;
3) heating the dispersion liquid to 58-60 ℃, adding the modified liquid, stirring and reacting for 5-6h at 58-60 ℃, carrying out suction filtration, washing the product with n-hexane and absolute ethyl alcohol for 3-4 times respectively, and finally drying in a 60 ℃ forced air drying oven for 22-24h to obtain the modified filler.
Further, the volume ratio of the dispersion liquid to the modification liquid in the step 3) is 10: 8-9.
A preparation method of an antibacterial waterproof coating for an exterior wall of a building comprises the following steps:
firstly, mixing silicone-acrylate emulsion, perfluoro-siloxane resin, hydroxyethyl cellulose and half of auxiliary agent according to parts by weight, adding the mixture into a stirring kettle, and stirring the mixture for 20 to 30 minutes at the stirring speed of 350r/min at normal temperature to obtain a base material;
and secondly, adding the chlorinated paraffin, the ammonium trimolybdate, the modified filler and the rest half of the auxiliary agent into the base material, stirring and mixing at the rotating speed of 500r/min for 40-50min at normal temperature, and then increasing the rotating speed to 2000r/min for stirring and mixing for 8-10min to obtain the antibacterial waterproof coating.
The invention has the beneficial effects that:
according to the invention, a modified filler is added into a coating raw material, the modified filler is prepared by modifying nano titanium dioxide, nano zinc oxide and kaolin, and a-Cl group on a tributyl chlorosilane molecule and-OH on the surface of the filler (nano zinc oxide, nano titanium dioxide and kaolin) are subjected to substitution reaction, so that a tributyl silane molecular chain is grafted on the surface of the filler to form the modified filler; after the tributyl chlorosilane is modified, on one hand, the-OH number on the surface of the filler can be reduced, so that the surface of the filler becomes hydrophobic, the hydrogen bond acting force can be weakened due to the reduction of the-OH number, the tributyl silane chain has a larger steric hindrance effect, and further the agglomeration phenomenon among filler particles is weakened, and the organic silane chain grafted on the surface has higher compatibility with a coating film-forming substance, so that the uniform dispersion of the filler in the coating can be promoted; on the other hand, silane molecular chains are introduced to the surfaces of the filler particles, have certain permeability and mobility, and can migrate to the surface of the coating to block the pores of the coating, improve the compactness and hydrophobicity of the coating, so that the waterproof performance of the coating is improved, and the barrier capacity of the coating to corrosive media can be improved due to the improvement of the compactness, so that the corrosion resistance and the antibacterial performance of the coating are improved; the filler contains nano zinc oxide and nano titanium dioxide, both of which are inorganic nano fillers with antibacterial effect, and can be uniformly dispersed in the coating after modification treatment, so that the antibacterial performance is better exerted; in addition, the filler also has a certain reinforcing effect, and can reinforce the mechanical strength of the coating;
according to the invention, the silicone-acrylic solution and the perfluorosiloxane resin are used as film forming substances of the coating, the silicone-acrylic emulsion has hydrophobicity and low surface energy and is not easy to pollute, and the perfluorosiloxane resin has the characteristics of stain resistance, water resistance and the like, so that a film forming matrix of the coating has good water resistance and self-cleaning performance; by adding the modified filler into the coating, the filler can be uniformly dispersed in the coating after being modified, so that the stable reinforcing and antibacterial properties can be exerted, and the filler can migrate to the surface of the coating, so that the compactness and hydrophobicity of the coating are improved, and the waterproof and anticorrosive properties of the coating are further improved; the obtained coating with antibacterial and waterproof functions is suitable for coating the outer wall of a building, and can play a good antibacterial and waterproof effect, so that the protection and the aesthetic property of the outer wall of the building are improved; in addition, the preparation method of the coating is simple in process, low in cost and suitable for large-scale production.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
An antibacterial waterproof coating for building exterior walls is prepared from the following raw materials in parts by weight: 50-60 parts of silicone-acrylic emulsion, 8-10 parts of perfluorosiloxane resin, 3-4 parts of modified filler, 2-3 parts of hydroxyethyl cellulose, 0.5-0.7 part of chlorinated paraffin, 0.3-0.4 part of ammonium trimolybdate and 0.6-1 part of auxiliary agent;
the auxiliary agent comprises a film-forming auxiliary agent, a dispersing agent, a thickening agent and a mildew preventive, wherein the mass ratio of the film-forming auxiliary agent to the matting agent to the dispersing agent to the mildew preventive is 10:8-9:10-12: 3-4;
the film-forming assistant is a compound of dodecyl glycol ester and dipropylene glycol butyl ether, and the mass ratio of the dodecyl glycol ester to the dipropylene glycol butyl ether is 1: 1; the dispersing agent is one or more of hydrophobic modified carboxylic acid sodium salt, polyacrylic acid sodium salt or ammonium salt; the thickening agent is one or more of diatomite, sodium bentonite, polyurethane, polyvinyl alcohol or polyacrylamide; the mildew preventive is a compound obtained by mixing isothiazolinone bactericide, pentachlorophenol and tetrachloroisophthalonitrile according to the mass ratio of 10:3-4:2-3, the isothiazolinone bactericide has a good sterilization effect, and both the pentachlorophenol and the tetrachloroisophthalonitrile are mildew preventives and show a superior mildew preventive effect;
the modified filler is prepared by the following method:
1) uniformly mixing nano zinc oxide, nano titanium dioxide and kaolin according to a mass ratio of 1:1:2, dispersing the mixture into n-hexane according to a solid-liquid ratio of 1g:10mL, magnetically stirring for 30-40min, and then carrying out ultrasonic treatment for 10-15min to obtain a dispersion liquid;
2) dissolving tributyl chlorosilane in normal hexane to form a modification liquid with the mass fraction of 12%;
3) heating the dispersion liquid to 58-60 ℃, adding the modified liquid, stirring and reacting for 5-6h at 58-60 ℃, carrying out suction filtration, washing the product with n-hexane and absolute ethyl alcohol for 3-4 times respectively, and finally drying in a 60 ℃ forced air drying oven for 22-24h to obtain a modified filler;
wherein the volume ratio of the dispersion liquid to the modification liquid is 10: 8-9;
carrying out substitution reaction on-Cl groups on tributyl chlorosilane molecules and-OH on the surface of a filler (nano zinc oxide, nano titanium dioxide and kaolin) to graft tributyl silane molecular chains on the surface of the filler to form a modified filler; after the tributyl chlorosilane is modified, on one hand, the-OH number on the surface of the filler can be reduced, so that the surface of the filler becomes hydrophobic, the hydrogen bond acting force can be weakened due to the reduction of the-OH number, the tributyl silane chain has a larger steric hindrance effect, and further the agglomeration phenomenon among filler particles is weakened, and the organic silane chain grafted on the surface has higher compatibility with a coating film-forming substance, so that the uniform dispersion of the filler in the coating can be promoted; on the other hand, silane molecular chains are introduced to the surfaces of the filler particles, have certain permeability and mobility, and can migrate to the surface of the coating to block the pores of the coating, improve the compactness and hydrophobicity of the coating, so that the waterproof performance of the coating is improved, and the barrier capacity of the coating to corrosive media can be improved due to the improvement of the compactness, so that the corrosion resistance and the antibacterial performance of the coating are improved;
the filler contains nano zinc oxide and nano titanium dioxide, both of which are inorganic nano fillers with antibacterial effect, and can be uniformly dispersed in the coating after modification treatment, so that the antibacterial performance is better exerted; in addition, the filler also has a certain reinforcing effect, and can reinforce the mechanical strength of the coating;
the preparation method of the coating comprises the following steps:
firstly, mixing silicone-acrylate emulsion, perfluoro-siloxane resin, hydroxyethyl cellulose and half of auxiliary agent according to parts by weight, adding the mixture into a stirring kettle, and stirring the mixture for 20 to 30 minutes at the stirring speed of 350r/min at normal temperature to obtain a base material;
and secondly, adding the chlorinated paraffin, the ammonium trimolybdate, the modified filler and the rest half of the auxiliary agent into the base material, stirring and mixing at the rotating speed of 500r/min for 40-50min at normal temperature, and then increasing the rotating speed to 2000r/min for stirring and mixing for 8-10min to obtain the antibacterial waterproof coating.
Example 1
An antibacterial waterproof coating for building exterior walls is prepared from the following raw materials in parts by weight: 50 parts of silicone-acrylate emulsion, 8 parts of perfluorosiloxane resin, 3 parts of modified filler, 2 parts of hydroxyethyl cellulose, 0.5 part of chlorinated paraffin, 0.3 part of ammonium trimolybdate and 0.6 part of auxiliary agent;
the antibacterial waterproof coating is prepared by the following steps:
firstly, mixing and adding silicone-acrylate emulsion, perfluoro-siloxane resin, hydroxyethyl cellulose and half of auxiliary agent in parts by weight into a stirring kettle, and stirring at the stirring speed of 350r/min for 20min at normal temperature to obtain a base material;
and secondly, adding the chlorinated paraffin, the ammonium trimolybdate, the modified filler and the rest half of the auxiliary agent into the base material, stirring and mixing for 40min at the rotating speed of 500r/min at normal temperature, and then increasing the rotating speed to 2000r/min, stirring and mixing for 8min to obtain the antibacterial waterproof coating.
Example 2
An antibacterial waterproof coating for building exterior walls is prepared from the following raw materials in parts by weight: 55 parts of silicone-acrylate emulsion, 9 parts of perfluorosiloxane resin, 3.5 parts of modified filler, 2.5 parts of hydroxyethyl cellulose, 0.6 part of chlorinated paraffin, 0.35 part of ammonium trimolybdate and 0.8 part of auxiliary agent;
the antibacterial waterproof coating is prepared by the following steps:
firstly, mixing and adding silicone-acrylate emulsion, perfluoro-siloxane resin, hydroxyethyl cellulose and half of auxiliary agent in parts by weight into a stirring kettle, and stirring at the stirring speed of 350r/min for 25min at normal temperature to obtain a base material;
and secondly, adding the chlorinated paraffin, the ammonium trimolybdate, the modified filler and the rest half of the auxiliary agent into the base material, stirring and mixing for 45min at the normal temperature at the rotating speed of 500r/min, and then increasing the rotating speed to 2000r/min, stirring and mixing for 9min to obtain the antibacterial waterproof coating.
Example 3
An antibacterial waterproof coating for building exterior walls is prepared from the following raw materials in parts by weight: 60 parts of silicone-acrylate emulsion, 10 parts of perfluorosiloxane resin, 4 parts of modified filler, 3 parts of hydroxyethyl cellulose, 0.7 part of chlorinated paraffin, 0.4 part of ammonium trimolybdate and 1 part of auxiliary agent;
the antibacterial waterproof coating is prepared by the following steps:
firstly, mixing and adding silicone-acrylate emulsion, perfluoro-siloxane resin, hydroxyethyl cellulose and half of auxiliary agent in parts by weight into a stirring kettle, and stirring at the stirring speed of 350r/min for 30min at normal temperature to obtain a base material;
and secondly, adding the chlorinated paraffin, the ammonium trimolybdate, the modified filler and the rest half of the auxiliary agent into the base material, stirring and mixing for 50min at the normal temperature at the rotating speed of 500r/min, and then increasing the rotating speed to 2000r/min, stirring and mixing for 10min to obtain the antibacterial waterproof coating.
Comparative example
The modified filler in the example 1 is replaced by a mixed filler obtained by nano zinc oxide, nano titanium dioxide and kaolin according to the mass ratio of 1:1:2, and the rest raw materials and the preparation process are unchanged.
The coatings prepared in examples 1-3 and comparative examples were tested for the following properties:
spraying each coating on the surface of an aluminum plate, and drying and curing at 120 ℃ for 10min to obtain each coating;
the hardness of the coating is tested according to GB/T6739-1996 pencil determination method for film hardness, and the compressive strength of the coating is tested; the stain resistance of the coating is tested by referring to GB/T9780-2013 'test method for stain resistance of architectural coating', the water permeability under 30MPa and 30min is tested, and the water absorption of the coating is tested; testing the antibacterial performance (bacteriostasis rate) of the coating by adopting an oscillation method, testing the antibacterial performance of the coating after 48h of water washing, and testing the mildew-proof grade; the test results are given in the following table:
as can be seen from the above table, the hardness of the coatings prepared in examples 1-3 all reach B level, and the compressive strength is 10.48-10.55MPa, which indicates that the coating prepared by the invention can meet the use requirements in terms of mechanical strength; the stain resistance of the coatings prepared in the embodiments 1-3 reaches 0 grade, the water absorption is 2.69-2.75%, and the water permeation phenomenon can not occur after the treatment at 30MPa for 30min, which shows that the coatings prepared by the invention have good waterproof performance and antifouling performance; the bacteriostatic rates of the coatings prepared in the embodiments 1-3 to escherichia coli and staphylococcus aureus are 99.0-99.5% and 99.2-99.5% respectively, and the mildew-proof grade reaches 0 grade, which indicates that the coating prepared by the invention has good antibacterial and mildew-proof performances; the filler can promote uniform dispersion in the coating after being modified by combining a comparative example, so that the reinforcing and antibacterial properties are more fully exerted, and the modified silane molecular chain grafted on the surface can migrate to the surface of the coating, so that the compactness and the hydrophobicity of the coating are improved, and the waterproof property and the corrosion resistance are further improved.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (5)
1. The antibacterial waterproof coating for the building outer wall is characterized by being prepared from the following raw materials in parts by weight: 50-60 parts of silicone-acrylic emulsion, 8-10 parts of perfluorosiloxane resin, 3-4 parts of modified filler, 2-3 parts of hydroxyethyl cellulose, 0.5-0.7 part of chlorinated paraffin, 0.3-0.4 part of ammonium trimolybdate and 0.6-1 part of auxiliary agent;
the antibacterial waterproof coating is prepared by the following steps:
firstly, mixing silicone-acrylate emulsion, perfluoro-siloxane resin, hydroxyethyl cellulose and half of auxiliary agent according to parts by weight, adding the mixture into a stirring kettle, and stirring the mixture for 20 to 30 minutes at the stirring speed of 350r/min at normal temperature to obtain a base material;
and secondly, adding the chlorinated paraffin, the ammonium trimolybdate, the modified filler and the rest half of the auxiliary agent into the base material, stirring and mixing at the rotating speed of 500r/min for 40-50min at normal temperature, and then increasing the rotating speed to 2000r/min for stirring and mixing for 8-10min to obtain the antibacterial waterproof coating.
2. The antibacterial waterproof coating for the building outer wall as claimed in claim 1, wherein the auxiliary comprises a film-forming auxiliary, a dispersing agent, a thickening agent and a mildew inhibitor, and the mass ratio of the film-forming auxiliary to the matting agent to the dispersing agent to the mildew inhibitor is 10:8-9:10-12: 3-4; the film-forming assistant is a compound of dodecyl glycol ester and dipropylene glycol butyl ether, and the mass ratio of the dodecyl glycol ester to the dipropylene glycol butyl ether is 1: 1; the dispersing agent is one or more of hydrophobic modified carboxylic acid sodium salt, polyacrylic acid sodium salt or ammonium salt; the thickening agent is one or more of diatomite, sodium bentonite, polyurethane, polyvinyl alcohol or polyacrylamide; the mildew preventive is a compound obtained by isothiazolinone bactericide, pentachlorophenol and tetrachloroisophthalonitrile according to the mass ratio of 10:3-4: 2-3.
3. The antibacterial waterproof coating for the exterior wall of the building as claimed in claim 1, wherein the modified filler is prepared by the following method:
1) uniformly mixing nano zinc oxide, nano titanium dioxide and kaolin according to a mass ratio of 1:1:2, dispersing the mixture into n-hexane according to a solid-liquid ratio of 1g:10mL, magnetically stirring for 30-40min, and then carrying out ultrasonic treatment for 10-15min to obtain a dispersion liquid;
2) dissolving tributyl chlorosilane in normal hexane to form a modification liquid with the mass fraction of 12%;
3) heating the dispersion liquid to 58-60 ℃, adding the modified liquid, stirring and reacting for 5-6h at 58-60 ℃, carrying out suction filtration, washing the product with n-hexane and absolute ethyl alcohol for 3-4 times respectively, and finally drying in a 60 ℃ forced air drying oven for 22-24h to obtain the modified filler.
4. The antibacterial waterproof coating for the exterior wall of the building as claimed in claim 3, wherein the volume ratio of the dispersion liquid to the modification liquid in the step 3) is 10: 8-9.
5. The preparation method of the antibacterial waterproof coating for the exterior wall of the building as claimed in claim 1, characterized by comprising the following steps:
firstly, mixing silicone-acrylate emulsion, perfluoro-siloxane resin, hydroxyethyl cellulose and half of auxiliary agent according to parts by weight, adding the mixture into a stirring kettle, and stirring the mixture for 20 to 30 minutes at the stirring speed of 350r/min at normal temperature to obtain a base material;
and secondly, adding the chlorinated paraffin, the ammonium trimolybdate, the modified filler and the rest half of the auxiliary agent into the base material, stirring and mixing at the rotating speed of 500r/min for 40-50min at normal temperature, and then increasing the rotating speed to 2000r/min for stirring and mixing for 8-10min to obtain the antibacterial waterproof coating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202010752747.8A CN111876041A (en) | 2020-07-30 | 2020-07-30 | Antibacterial waterproof coating for building exterior wall and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010752747.8A CN111876041A (en) | 2020-07-30 | 2020-07-30 | Antibacterial waterproof coating for building exterior wall and preparation method thereof |
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| CN116855149A (en) * | 2023-06-16 | 2023-10-10 | 青岛理工大学 | A self-cleaning coating that can actively absorb dust and remove haze, preparation method and application |
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