CN114702847A - Building coating with antibacterial and mildewproof functions and preparation method thereof - Google Patents

Building coating with antibacterial and mildewproof functions and preparation method thereof Download PDF

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Publication number
CN114702847A
CN114702847A CN202210437276.0A CN202210437276A CN114702847A CN 114702847 A CN114702847 A CN 114702847A CN 202210437276 A CN202210437276 A CN 202210437276A CN 114702847 A CN114702847 A CN 114702847A
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parts
agent
coating
antibacterial
mildewproof
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Inventor
刘云强
张传波
喻晓
殷韵
余辉
周洋
段珊珊
杨健
鲁黎
陈翔
梁伯达
余璐
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China Railway Siyuan Survey and Design Group Co Ltd
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China Railway Siyuan Survey and Design Group Co Ltd
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    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09DCOATING 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
    • C09D1/00Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances
    • C09D1/02Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances alkali metal silicates
    • C09D1/04Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances alkali metal silicates with organic additives
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09DCOATING 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
    • C09D1/00Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09DCOATING 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
    • C09D143/00Coating 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
    • C09D143/04Homopolymers or copolymers of monomers containing silicon
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09DCOATING 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
    • C09D5/00Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/14Paints containing biocides, e.g. fungicides, insecticides or pesticides
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09DCOATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40Additives
    • C09D7/60Additives non-macromolecular
    • C09D7/61Additives non-macromolecular inorganic
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08KUse of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00Use of inorganic substances as compounding ingredients
    • C08K3/18Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/20Oxides; Hydroxides
    • C08K3/22Oxides; Hydroxides of metals
    • C08K2003/2237Oxides; Hydroxides of metals of titanium
    • C08K2003/2241Titanium dioxide
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08KUse of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00Use of inorganic substances as compounding ingredients
    • C08K3/18Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/24Acids; Salts thereof
    • C08K3/26Carbonates; Bicarbonates
    • C08K2003/265Calcium, strontium or barium carbonate
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08KUse of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00Use of inorganic substances as compounding ingredients
    • C08K3/30Sulfur-, selenium- or tellurium-containing compounds
    • C08K2003/3009Sulfides
    • C08K2003/3036Sulfides of zinc

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Plant Pathology (AREA)
  • Paints Or Removers (AREA)

Abstract

The invention relates to the technical field of coatings, in particular to an architectural coating with antibacterial and mildewproof functions and a preparation method thereof, wherein the architectural coating comprises the following raw materials in parts by weight: 80-120 parts of silicate solution, 100-140 parts of silica sol, 60-100 parts of silicone-acrylic emulsion, 100-150 parts of silicate filler, 30-50 parts of zinc sulfide, 4-7 parts of thickening agent, 2-4 parts of wetting agent, 5-8 parts of dispersing agent, 2-4 parts of defoaming agent, 4-8 parts of stabilizing agent, 8-12 parts of organosilicon hydrophobic agent and 300 parts of water 200-acrylic emulsion. The pH value of the coating is kept above 11, the coating has the effect of inhibiting the growth of microorganisms such as bacteria, yeasts and molds, the pH value of the coating is gradually reduced after the coating is exposed in the air and reacts with carbon dioxide, water vapor and the like, and after the coating is formed into a film and dried, zinc sulfide added can generate zinc ions with a certain concentration under the actions of water vapor, oxygen and photosynthesis, so that the durability of the antibacterial and mildewproof effects of the coating is improved.

Description

Building coating with antibacterial and mildewproof functions and preparation method thereof
Technical Field
The invention relates to the technical field of coatings, in particular to an architectural coating with antibacterial and mildewproof functions and a preparation method thereof.
Background
The building exterior wall coating is a coating variety with the largest consumption in the building coating, and along with the continuous improvement of the production and living standards of people, the requirements of people on the exterior wall coating are higher and higher, and the exterior wall coating not only has decorative performance, but also has various performances of heat preservation, heat insulation, water resistance, corrosion resistance, self cleaning and the like, so that the exterior wall coating with multiple performances is produced.
The antibacterial and mildewproof coating has the advantages of reducing the probability of bacteria reproduction and disease transmission, avoiding the complicated process of sterilizing the environment, and being widely applied to various public places, houses, offices and the like. The existing antibacterial coating generally adopts an artificially synthesized organic antibacterial agent as a functional additive of the antibacterial and mildewproof coating, but the antibacterial and mildewproof coating generally has the defects of weakening the antibacterial and mildewproof functions, such as easy volatilization, short time-effect, narrow antibacterial spectrum, easy generation of drug resistance of bacteria and the like, and the defects of damaging the environment, such as harm to human bodies, of volatile components, so that the antibacterial and mildewproof coating cannot be popularized and used in a large range.
Therefore, in view of the above problems, it is an urgent need to solve the technical problems of the art to develop a building coating with lasting antibacterial and antifungal functions and a preparation method thereof.
Disclosure of Invention
The first aim of the invention is to provide an antibacterial and mildewproof building coating which has lasting antibacterial and mildewproof performance;
the second purpose of the invention is to provide a preparation method of the antibacterial and mildewproof building coating, the preparation method is simple and convenient, and the prepared coating has excellent antibacterial and mildewproof functions.
The invention provides an architectural coating which comprises the following raw materials in parts by weight: 80-120 parts of silicate solution, 100-140 parts of silica sol, 60-100 parts of silicone-acrylic emulsion, 100-150 parts of silicate filler, 30-50 parts of zinc sulfide, 4-7 parts of thickening agent, 2-4 parts of wetting agent, 5-8 parts of dispersing agent, 2-4 parts of defoaming agent, 4-8 parts of stabilizing agent, 8-12 parts of organosilicon hydrophobic agent and 300 parts of water 200-acrylic emulsion;
preferably, the silica sol has a modulus > 50.
The silica sol is added into the coating as a binder, the modulus of the silica sol has obvious influence on the stability and mildew-proof durability of the coating, and researches show that the silica sol with the modulus of more than 50 has better stability and antibacterial and mildew-proof effects.
The silicone hydrophobizing agent herein includes silicone coupling agents, silicone oils, silicone resins, and the like in terms of the size of molecular weight.
Preferably, the technical scheme also comprises the following raw materials in parts by weight: 100-150 parts of coarse whiting and 100-150 parts of titanium dioxide;
preferably, the titanium dioxide is rutile type titanium dioxide.
In the building coating of the invention, the heavy calcium carbonate powder further comprises 150 parts of heavy calcium carbonate 100-150 parts and titanium dioxide powder 100-150 parts, and the titanium dioxide powder is preferably rutile titanium dioxide powder. Wherein, the addition of the heavy calcium can increase the thickness of a coating film and improve the wear resistance and durability of the coating; the rutile titanium dioxide has the characteristics of high whiteness, high refractive index, stable material chemical property and the like, and can obviously improve the glossiness and the covering power of the coating. In addition, titanium dioxide can also generate super-strong oxidizing free radicals under the action of light, so that the growth of mould can be inhibited, organic pollutants on the surface of a coating film can be oxidized, the super-hydrophobic effect of the coating film is realized, and the self-cleaning function is achieved.
Preferably, the silicate solution comprises one or two of potassium silicate solution and lithium silicate solution,
preferably, the modulus of the potassium silicate is 3.5 to 4 and the modulus of the lithium silicate is 4.5 to 5.
Specifically, the silicate solution used in the invention comprises any one or combination of two of a potassium silicate solution and a lithium silicate solution, wherein the potassium silicate and the lithium silicate have irreversibility of water and excellent waterproof effect, and on one hand, the antibacterial and mildewproof effects of the architectural coating are also improved.
Preferably, in the technical scheme, the minimum film forming temperature of the silicone-acrylic emulsion is 5 ℃.
Further, in order to provide the coating with a longer construction period, the minimum film forming temperature of the silicone-acrylic emulsion used in the invention is 5 ℃.
Preferably, the silicate filler comprises a combination of any two or more of calcined kaolin, wollastonite and quartz powder.
The invention selects the above filler to mix with silicate solution, silica sol, silicone-acrylate emulsion and other effective components for use, which can obviously improve the cohesiveness and surface smoothness of the coating.
Preferably, in the technical scheme, the thickening agent is hydroxyethyl cellulose;
the wetting agent is any one of alkylphenol polyoxyethylene and polyoxyethylene polyoxypropylene block copolymer;
the dispersing agent is any one of a polymer dispersing agent or a siloxane dispersing agent;
the defoaming agent is mineral oil defoaming agent.
The invention also discloses a preparation method of the building material, which comprises the following steps:
s1, sequentially adding the thickening agent, the dispersing agent, the wetting agent and part of the defoaming agent into water, and uniformly stirring to obtain a first mixed solution;
s2, sequentially adding titanium dioxide, coarse whiting, silicate filler and zinc sulfide into the first mixed solution, and uniformly stirring to obtain a second mixed solution;
s3, sequentially adding the stabilizer, the organic silicon hydrophobing agent, the silicone-acrylic emulsion, the silica sol and the residual defoaming agent into the second mixed solution, and uniformly stirring to obtain a third mixed solution;
and S4, adding a silicate solution into the third mixed solution, and uniformly stirring to obtain the architectural coating.
The charging, solvation and brownian motion of the dispersed particles are the main causes of instability of the coating. Therefore, in order to further improve the stability of the coating, the research of the invention shows that the building coating prepared by dissolving the thickening agent, the dispersing agent, the wetting agent and part of the defoaming agent, sequentially adding the titanium dioxide, the triple superphosphate, the silicate filler and the zinc sulfide, the stabilizer, the organic silicon hydrophobic agent, the silicone-acrylate emulsion, the silica sol and the residual defoaming agent, and finally adding the binder silicate solution has excellent stability, thereby further ensuring the durability of the antibacterial and mildewproof effects.
Preferably, in the step S1, the rotation speed is controlled to be 500-800rpm and the time is 4-6min during stirring;
in step S2, the rotation speed is controlled to 800-;
in step S3, the rotation speed is controlled to be 500-800rpm and the time is 4-6min during stirring;
in step S4, the rotation speed is controlled to be 500-800rpm for 4-6min during stirring.
Preferably, in step S1, the part of the antifoaming agent is 1/4-3/4 of the total amount of the antifoaming agent.
Preferably, in step S3, after the second mixed solution has no bubble, the stabilizer, the silicone hydrophobizing agent, the silicone acrylic emulsion, the silica sol, and the remaining defoamer are added.
Compared with the prior art, the antibacterial and mildewproof building coating has the following technical effects:
the antibacterial and mildewproof building coating disclosed by the invention uses the silicate solution and the silica sol as main binders, and the silicone-acrylate emulsion is added, so that the properties of early water resistance, weather resistance, salting resistance, stain resistance and the like of the silicate coating in the prior art are improved, and the addition of the silica sol reduces the using amount of the silicate solution, reduces the pH value of the coating and reduces potential damage which can be caused by directly contacting the skin in construction; the pH value of the coating is kept above 11, so that the coating is endowed with the effect of inhibiting the growth of microorganisms such as bacteria, yeasts and molds, the pH value of the coating is gradually reduced after the coating is exposed in the air and reacts with carbon dioxide, water vapor and the like, zinc sulfide is added to generate zinc ions with a certain concentration under the actions of water vapor, oxygen and photosynthesis after the coating is formed into a film and dried, and the durability of the antibacterial and mildewproof effect of the coating is further improved. Finally, the building coating obtained according to the proportion and the components of the invention has the solid content of organic matters less than 5%, does not contain substances harmful to human bodies and environment, such as antiseptic and bactericide, and has good environmental protection performance.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms also include the plural forms unless the context clearly dictates otherwise, and further, it is understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of the stated features, steps, operations, devices, components, and/or combinations thereof.
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 some, but not all, embodiments of the present invention. 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.
Example 1
Raw materials: 80 parts of potassium silicate solution, 100 parts of silica sol, 100 parts of silicone-acrylate emulsion, 100 parts of calcined kaolin, 30 parts of zinc sulfide, 4 parts of hydroxyethyl cellulose, 2 parts of alkylphenol polyoxyethylene, 5 parts of polymeric dispersant, 2 parts of mineral oil defoamer, 4 parts of stabilizer, 8 parts of organosilicon hydrophobic agent, 100 parts of heavy calcium carbonate, 100 parts of titanium pigment and 200 parts of water.
S11, sequentially adding the thickening agent, the dispersing agent, the wetting agent and the 1/4 defoaming agent into water, controlling the rotating speed to be 500rpm, and stirring for 6min to obtain a first mixed solution;
s12, sequentially adding titanium dioxide, heavy calcium carbonate, silicate filler and zinc sulfide into the first mixed solution, controlling the rotating speed to be 800rpm, and stirring for 30min to obtain a second mixed solution;
s13, sequentially adding a stabilizer, an organic silicon hydrophobing agent, a silicone acrylic emulsion, a silica sol and a 3/4 defoaming agent into the second mixed solution, controlling the rotating speed to be 500rpm, and stirring for 6min to obtain a third mixed solution;
and S14, adding a silicate solution into the third mixed solution, controlling the rotating speed to be 500rpm, and stirring for 6min to obtain the antibacterial and mildewproof building coating.
Example 2
Raw materials: 120 parts of lithium silicate solution, 140 parts of silica sol, 60 parts of silicone-acrylate emulsion, 150 parts of quartz powder, 50 parts of zinc sulfide, 7 parts of hydroxyethyl cellulose, 4 parts of alkylphenol polyoxyethylene, 8 parts of high-molecular dispersing agent, 4 parts of mineral oil defoaming agent, 8 parts of stabilizer, 12 parts of organic silicon hydrophobic agent, 150 parts of heavy calcium carbonate and 150 parts of titanium dioxide and 300 parts of water.
S21, sequentially adding the thickening agent, the dispersing agent, the wetting agent and the 1/2 defoaming agent into water, controlling the rotating speed to be 800rpm, and stirring for 4min to obtain a first mixed solution;
s22, sequentially adding titanium dioxide, heavy calcium carbonate, silicate filler and zinc sulfide into the first mixed solution, controlling the rotating speed to be 1200rpm, and stirring for 20min to obtain a second mixed solution;
s23, sequentially adding a stabilizer, an organic silicon hydrophobic agent, a silicone-acrylic emulsion, a silica sol and a 1/2 antifoaming agent into the second mixed solution, controlling the rotating speed to be 800rpm, and stirring for 4min to obtain a third mixed solution;
and S24, adding a silicate solution into the third mixed solution, controlling the rotating speed to be 800rpm, and stirring for 4min to obtain the antibacterial and mildewproof architectural coating.
Example 3
Raw materials: 60 parts of potassium silicate solution, 40 parts of lithium silicate solution, 120 parts of silica sol, 80 parts of silicone acrylic emulsion, 60 parts of wollastonite, 60 parts of quartz powder, 40 parts of zinc sulfide, 5 parts of hydroxyethyl cellulose, 3 parts of alkylphenol polyoxyethylene, 6 parts of siloxane dispersing agent, 3 parts of mineral oil defoaming agent, 6 parts of stabilizing agent, 10 parts of organosilicon hydrophobic agent, 120 parts of heavy calcium and 250 parts of water of titanium pigment.
S31, sequentially adding the thickening agent, the dispersing agent, the wetting agent and the 3/4 defoaming agent into water, controlling the rotating speed to be 600rpm, and stirring for 5min to obtain a first mixed solution;
s32, sequentially adding titanium dioxide, heavy calcium carbonate, silicate filler and zinc sulfide into the first mixed solution, controlling the rotating speed to be 1000rpm, and stirring for 25min to obtain a second mixed solution;
s33, sequentially adding a stabilizer, an organic silicon hydrophobic agent, a silicone-acrylic emulsion, a silica sol and a 1/4 defoaming agent into the second mixed solution, controlling the rotating speed to be 600rpm, and stirring for 5min to obtain a third mixed solution;
and S34, adding a silicate solution into the third mixed solution, controlling the rotating speed to be 600rpm, and stirring for 5min to obtain the antibacterial and mildewproof building coating.
Example 4
Raw materials: 60 parts of potassium silicate solution, 60 parts of lithium silicate solution, 120 parts of silica sol, 90 parts of silicone acrylic emulsion, 50 parts of calcined kaolin, 50 parts of wollastonite, 50 parts of quartz powder, 50 parts of zinc sulfide, 7 parts of hydroxyethyl cellulose, 4 parts of alkylphenol polyoxyethylene, 8 parts of polymeric dispersant, 4 parts of mineral oil defoamer, 8 parts of stabilizer, 12 parts of organosilicon hydrophobic agent, 120 parts of heavy calcium, 120 parts of titanium dioxide and 300 parts of water.
S41, sequentially adding the thickening agent, the dispersing agent, the wetting agent and the 1/4 defoaming agent into water, controlling the rotating speed to be 800rpm, and stirring for 6min to obtain a first mixed solution;
s42, sequentially adding titanium dioxide, heavy calcium carbonate, silicate filler and zinc sulfide into the first mixed solution, controlling the rotating speed to be 900rpm, and stirring for 28min to obtain a second mixed solution;
s43, sequentially adding a stabilizer, an organic silicon hydrophobic agent, a silicone-acrylic emulsion, a silica sol and a 3/4 antifoaming agent into the second mixed solution, controlling the rotating speed to be 800rpm, and stirring for 6min to obtain a third mixed solution;
and S44, adding a silicate solution into the third mixed solution, controlling the rotating speed to be 800rpm, and stirring for 6min to obtain the antibacterial and mildewproof architectural coating.
Example 5
Raw materials: 40 parts of potassium silicate solution, 60 parts of lithium silicate solution, 110 parts of silica sol, 70 parts of silicone acrylic emulsion, 120 parts of calcined kaolin, 35 parts of zinc sulfide, 5 parts of hydroxyethyl cellulose, 3 parts of alkylphenol polyoxyethylene, 6 parts of polymeric dispersant, 3 parts of mineral oil defoamer, 5 parts of stabilizer, 9 parts of organosilicon hydrophobing agent, 110 parts of heavy calcium, 110 parts of titanium pigment and 280 parts of water.
S51, sequentially adding the thickening agent, the dispersing agent, the wetting agent and the 1/4 defoaming agent into water, controlling the rotating speed to be 700rpm, and stirring for 5min to obtain a first mixed solution;
s52, sequentially adding titanium dioxide, heavy calcium carbonate, silicate filler and zinc sulfide into the first mixed solution, controlling the rotating speed to be 1000rpm, and stirring for 25min to obtain a second mixed solution;
s53, sequentially adding a stabilizer, an organic silicon hydrophobic agent, a silicone-acrylic emulsion, a silica sol and a 3/4 defoaming agent into the second mixed solution, controlling the rotating speed to be 700rpm, and stirring for 5min to obtain a third mixed solution;
and S54, adding a silicate solution into the third mixed solution, controlling the rotating speed to be 700rpm, and stirring for 5min to obtain the antibacterial and mildewproof building coating.
Example 6
Raw materials: 120 parts of lithium silicate solution, 130 parts of silica sol, 90 parts of silicone-acrylate emulsion, 60 parts of calcined kaolin, 60 parts of wollastonite, 50 parts of zinc sulfide, 7 parts of hydroxyethyl cellulose, 4 parts of alkylphenol polyoxyethylene, 8 parts of polymeric dispersant, 4 parts of mineral oil defoaming agent, 8 parts of stabilizer, 12 parts of organic silicon hydrophobic agent, 140 parts of heavy calcium, 140 parts of titanium dioxide and 300 parts of water.
S61, sequentially adding the thickening agent, the dispersing agent, the wetting agent and the 1/2 defoaming agent into water, controlling the rotating speed to be 800rpm, and stirring for 5min to obtain a first mixed solution;
s62, sequentially adding titanium dioxide, heavy calcium carbonate, silicate filler and zinc sulfide into the first mixed solution, controlling the rotating speed to be 1200rpm, and stirring for 20min to obtain a second mixed solution;
s63, sequentially adding a stabilizer, an organic silicon hydrophobic agent, a silicone-acrylic emulsion, a silica sol and a 1/2 defoaming agent into the second mixed solution, controlling the rotating speed to be 800rpm, and stirring for 5min to obtain a third mixed solution;
and S64, adding a silicate solution into the third mixed solution, controlling the rotating speed to be 800rpm, and stirring for 5min to obtain the antibacterial and mildewproof building coating.
Comparative example 1
The removal of zinc sulfide, other raw materials and preparation steps were the same as in example 3.
Comparative example 2
The removal of titanium dioxide, other raw materials and preparation steps were the same as in example 3.
Firstly, in order to verify the excellent antibacterial and mildewproof performance of the architectural coating prepared by the invention, according to the detection of the mildew resistance of a paint film by GB/T1741-2020, examples 1-6 and comparative examples 1-2 are respectively added into a corn meal agar culture medium, then the medium is placed at the normal temperature for 28 days and 56 days, and the observation is carried out, wherein the test results are shown in Table 1.
TABLE 1 antibacterial and antimildew Properties
Figure BDA0003603626490000091
As can be seen from the data in the table, the architectural coatings prepared in examples 1-6 of the present invention have excellent antibacterial and antifungal properties and durable antibacterial and antifungal properties compared to the comparative examples 1-2.
Meanwhile, the environmental protection performance parameters of the coatings obtained in examples 1 to 6 and comparative examples 1 to 2 were measured according to HJ2537 to 2014, and the measurement results are shown in Table 2.
TABLE 2 environmental Performance parameters
Figure BDA0003603626490000092
Figure BDA0003603626490000101
As can be seen from Table 2, the VOC detection result of the architectural coating prepared by the invention is far lower than the national standard, and free formaldehyde and soluble heavy metal are not detected, so that the environmental protection performance is excellent.
In addition, the prepared coating is subjected to combustion performance tests, and the test results are A-grade (non-combustibility).
In conclusion, the building coating claimed by the invention has the excellent technical effects of good environmental protection and durable antibacterial and mildew-proof performance.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (10)

1. The antibacterial and mildewproof building coating is characterized by comprising the following raw materials in parts by weight: 80-120 parts of silicate solution, 100-140 parts of silica sol, 60-100 parts of silicone-acrylic emulsion, 100-150 parts of silicate filler, 30-50 parts of zinc sulfide, 4-7 parts of thickening agent, 2-4 parts of wetting agent, 5-8 parts of dispersing agent, 2-4 parts of defoaming agent, 4-8 parts of stabilizing agent, 8-12 parts of organosilicon hydrophobic agent and 300 parts of water 200-acrylic emulsion;
preferably, the silica sol has a modulus > 50.
2. The antibacterial and mildewproof architectural coating according to claim 1, further comprising the following raw materials in parts by weight: 100-150 parts of coarse whiting and 100-150 parts of titanium dioxide;
preferably, the titanium dioxide is rutile type titanium dioxide.
3. The antibacterial and mildewproof architectural coating according to claim 1, wherein the silicate solution comprises any one or a combination of two of a potassium silicate solution and a lithium silicate solution;
preferably, the modulus of the potassium silicate is 3.5 to 4 and the modulus of the lithium silicate is 4.5 to 5.
4. The antibacterial and mildewproof architectural coating according to claim 1, wherein the silicone-acrylic emulsion has a minimum film forming temperature of 5 ℃.
5. The antimicrobial and mildewproof architectural coating of claim 1, wherein the silicate filler comprises a combination of any two or more of calcined kaolin, wollastonite, and quartz powder.
6. The antibacterial and mildewproof architectural coating according to claim 1, wherein the thickener is hydroxyethyl cellulose;
the wetting agent is any one of alkylphenol polyoxyethylene and polyoxyethylene polyoxypropylene block copolymer;
the dispersant is any one of a polymer dispersant or a siloxane dispersant;
the defoaming agent is a mineral oil defoaming agent.
7. The preparation method of the antibacterial and mildewproof architectural coating according to any one of claims 1 to 6, is characterized by comprising the following steps of:
s1, sequentially adding the thickening agent, the dispersing agent, the wetting agent and part of the defoaming agent into water, and uniformly stirring to obtain a first mixed solution;
s2, sequentially adding titanium dioxide, coarse whiting, silicate filler and zinc sulfide into the first mixed solution, and uniformly stirring to obtain a second mixed solution;
s3, sequentially adding the stabilizer, the organic silicon hydrophobing agent, the silicone-acrylic emulsion, the silica sol and the residual defoaming agent into the second mixed solution, and uniformly stirring to obtain a third mixed solution;
and S4, adding a silicate solution into the third mixed solution, and uniformly stirring to obtain the architectural coating.
8. The method as claimed in claim 7, wherein in step S1, the rotation speed is controlled to be 500-800rpm for 4-6min during stirring;
in step S2, the rotation speed is controlled to 800-;
in step S3, the rotation speed is controlled to be 500-800rpm and the time is 4-6min during stirring;
in step S4, the rotation speed is controlled to be 500-800rpm for 4-6min during stirring.
9. The method of claim 7, wherein the portion of the antifoaming agent in step S1 is 1/4-3/4 of the total amount of the antifoaming agent.
10. The method according to claim 7, wherein in step S3, the stabilizer, the silicone hydrophobizing agent, the silicone-acrylic emulsion, the silica sol and the remaining defoaming agent are added after the second mixture is bubble-free.
CN202210437276.0A 2022-04-19 2022-04-19 Building coating with antibacterial and mildewproof functions and preparation method thereof Pending CN114702847A (en)

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