CN113372742A - Silicate coating and preparation method thereof - Google Patents
Silicate coating and preparation method thereof Download PDFInfo
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- CN113372742A CN113372742A CN202110507423.2A CN202110507423A CN113372742A CN 113372742 A CN113372742 A CN 113372742A CN 202110507423 A CN202110507423 A CN 202110507423A CN 113372742 A CN113372742 A CN 113372742A
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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
- C09D1/00—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances
- C09D1/02—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances alkali metal silicates
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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
- C09D5/18—Fireproof paints including high temperature resistant paints
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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
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
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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
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/70—Additives characterised by shape, e.g. fibres, flakes or microspheres
Abstract
The invention provides a silicate coating and a preparation method thereof, relating to the technical field of coatings. A silicate coating comprises the following raw materials: the composite modified silicate comprises composite modified silicate, a dispersing agent, a thickening agent, a defoaming agent, four-needle zinc oxide whiskers, a modifying agent, kaolin, titanium dioxide, calcium carbonate, barium sulfate, mica powder, a nano super-hydrophobic material, silicon micropowder and water. The preparation method of the silicate coating comprises the following steps: weighing raw materials; adding a nano super-hydrophobic material and water into the composite modified silicate to obtain a mixture 1; adding a dispersing agent, a wetting agent, a defoaming agent and a thickening agent into the mixture 1 to obtain a mixture 2; sequentially adding the tetrapod-like zinc oxide whiskers and the modifier into the mixture 2, and uniformly stirring to obtain a mixture 3; and obtaining a finished silicate coating. The silicate coating prepared by the invention has the advantages of environmental protection, fire resistance, flame retardance, good water resistance and low content of harmful substances.
Description
Technical Field
The invention relates to the technical field of coatings, and particularly relates to a silicate coating and a preparation method thereof.
Background
The social development pace is accelerated, the environmental pollution is more and more serious, and the paint industry serving as a main pollution source is developed towards the direction of low pollution and environmental protection. Meanwhile, along with the occurrence of a plurality of fires in the world, people pay more and more attention to the environmental protection and safety requirements of healthy living environment, and in addition, all countries in the world make strict limits on the content of Volatile Organic Compounds (VOC) of the coating, and the zero-emulsion inorganic coating accords with the development direction of the environmental-friendly coating.
The paint for inner wall is emulsion paint painted to inner wall and has emulsion as main adhesive matter, organic assistant, pigment and stuffing, and the paint is painted to wall and dried naturally to reach the aim of decorating and protecting wall. However, with the increasing living standards of people, the comfort, environmental protection and safety requirements of people on living environment decoration are higher and higher, especially the fire protection requirements of high-rise buildings and the limit requirements of VOC of children rooms, so that the existing emulsion type interior wall coating is embarrassed, mainly because a small amount of monomers are easy to remain in the emulsion during synthesis, the VOC content can be detected even after purification technology treatment, and the emulsion is extremely easy to burn as an organic matter and can generate a large amount of toxic and harmful black smoke, so the existing emulsion type interior wall coating is difficult to reach the performance indexes that the VOC is not detected and the burning grade is A.
Currently, silicate coatings and acrylic coatings are more commonly used on the market, but both suffer from different disadvantages. The traditional silicate paint also has the problem of poor water resistance, and the performance of the paint is not greatly improved. The type and content of the acrylic emulsion used in the acrylic coating have a great influence on the performance of the aqueous inorganic coating, for example, the content of the acrylic emulsion affects the VOC content, fire-retardant rating, mildew-proof performance and the like.
The inorganic paint prepared by compounding silicate and polypropylene emulsion has a good formaldehyde removing effect, but has poor fireproof and flame-retardant performance, a small amount of macromolecular organic matters contained in a paint film can be combusted under a high-temperature condition to emit a small amount of toxic and harmful dense smoke, the surface of the paint film can also be grey black, and the inorganic paint is still a small potential safety hazard when indoor fire occurs.
Disclosure of Invention
The invention aims to provide a silicate coating which has the advantages of environmental protection, fire prevention, flame retardance, good water resistance and low content of harmful substances.
The invention also aims to provide a preparation method of the silicate coating, so as to prepare the silicate coating which is environment-friendly, fireproof, flame-retardant, good in water resistance and low in harmful substance content.
The technical problem to be solved by the invention is realized by adopting the following technical scheme.
On one hand, the embodiment of the application provides a silicate coating, which comprises the following raw materials in parts by weight: 20-60 parts of composite modified silicate, 0.1-1 part of dispersant, 0.1-1 part of thickener, 0.1-1 part of defoamer, 0.1-3 parts of tetrapod-like zinc oxide whisker, 6.2-26 parts of modifier, 10-15 parts of kaolin, 5-20 parts of titanium dioxide, 1-10 parts of calcium carbonate, 1-10 parts of barium sulfate, 1-5 parts of mica powder, 0.5-5 parts of nano super-hydrophobic material, 0.5-5 parts of silicon micropowder and 50-100 parts of water.
On the other hand, the embodiment of the application provides a preparation method of silicate paint, which is characterized by comprising the following steps:
weighing the raw materials according to the parts by weight, and calcining the kaolin for 0.5-5 h;
adding a nano super-hydrophobic material and water into the composite modified silicate, stirring for 0.2-1h at 15-30 ℃, then heating to 40-70 ℃, and stirring for 1-3h to obtain a mixture 1;
adding a dispersing agent, a wetting agent, a defoaming agent and a thickening agent into the mixture 1, and uniformly stirring to obtain a mixture 2;
sequentially adding the tetrapod-like zinc oxide whiskers and the modifier into the mixture 2, and uniformly stirring to obtain a mixture 3;
adding titanium dioxide, calcined kaolin, mica powder, barium sulfate, calcium carbonate, silicon micropowder and mica powder into the mixture 3, and uniformly stirring to obtain a finished silicate coating.
Compared with the prior art, the embodiment of the invention has at least the following advantages or beneficial effects:
the main raw material used for preparing the silicate coating is the composite modified silicate, and the raw material is silicate (at least one of potassium silicate and sodium silicate), and the petrochemical raw material is used as a film forming material, so that the environmental protection of the product is ensured, and the raw material is cheap and easy to obtain; the quadriversal structure formed by modifying the tetrapod-like zinc oxide whiskers by the modifier has outstanding fireproof and flame-retardant performances, can quickly release crystal water in a system when meeting flame above 1000 ℃, and extends outwards in an annular structure to play a role in fireproof and flame-retardant; the water resistance of the coating is improved by replacing and modifying the composite modified silicate modified by sulfuric acid with silicon triphosphate and aluminum tripolyphosphate; the quadriversal net structure formed by the super-hydrophobic nano material and the tetrapod-like zinc oxide whiskers has high strength and can generate strong adhesive force, so that the structure is firm and is not easy to fall off when the super-hydrophobic nano material is coated on a wall; the formed silicate coating is alkalescent, and because the optimum pH value for bacterial growth is 7.2-7.6, the formed quadriversal zinc oxide whiskers and the alkalescent environment can inhibit the formation and survival of mold, and the prepared coating has an antibacterial effect; the coating can be breathable and waterproof under the compounding of the nano super-hydrophobic material and the zinc oxide whiskers, so that the dryness of the coating is kept, and the prepared coating has better durability; the silicon micropowder is added into the formula and acts with the composite modified silicate, so that the structural strength of the integral silicate coating is enhanced.
The invention firstly adds the nano super-hydrophobic material into the composite modified silicate, modifies the composite modified silicate, then adds the dispersant, the wetting agent, the defoamer and the thickener, then adds the tetrapod-like zinc oxide whisker and the modifier, modifies the tetrapod-like zinc oxide whisker and the composite modified silicate to form a quadriversal structure, and finally adds the titanium dioxide, the calcined kaolin, the mica powder, the barium sulfate, the calcium carbonate and the silicon micropowder to obtain the finished product of the silicate coating.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to specific examples.
The invention provides a silicate coating which is characterized by comprising the following raw materials in parts by weight: 20-60 parts of composite modified silicate, 0.1-1 part of dispersant, 0.1-1 part of thickener, 0.1-1 part of defoamer, 0.1-3 parts of tetrapod-like zinc oxide whisker, 6.2-26 parts of modifier, 10-15 parts of kaolin, 5-20 parts of titanium dioxide, 1-10 parts of calcium carbonate, 1-10 parts of barium sulfate, 1-5 parts of mica powder, 0.5-5 parts of nano super-hydrophobic material, 0.5-5 parts of silicon micropowder and 50-100 parts of water. The main raw material used for preparing the silicate coating is the composite modified silicate, and the raw material is silicate (at least one of potassium silicate and sodium silicate), and the petrochemical raw material is used as a film forming material, so that the environmental protection of the product is ensured, and the raw material is cheap and easy to obtain; the quadriversal structure formed by modifying the tetrapod-like zinc oxide whiskers by the modifier has outstanding fireproof and flame-retardant performances, can quickly release crystal water in a system when meeting flame above 1000 ℃, and extends outwards in an annular structure to play a role in fireproof and flame-retardant; the water resistance of the coating is improved by replacing and modifying the composite modified silicate modified by sulfuric acid with silicon triphosphate and aluminum tripolyphosphate; the quadriversal net structure formed by the super-hydrophobic nano material and the tetrapod-like zinc oxide whiskers has high strength and can generate strong adhesive force, so that the structure is firm and is not easy to fall off when the super-hydrophobic nano material is coated on a wall; the formed silicate coating is alkalescent, and because the optimum pH value for bacterial growth is 7.2-7.6, the formed quadriversal zinc oxide whiskers and the alkalescent environment can inhibit the formation and survival of mold, and the prepared coating has an antibacterial effect; the coating can be breathable and waterproof under the compounding of the nano super-hydrophobic material and the zinc oxide whisker, so that the dryness of the coating is kept, and the prepared coating has better durability; the silicon micropowder is added into the formula and acts with the composite modified silicate, so that the structural strength of the integral silicate coating is enhanced.
In some embodiments of the present application, the above-described composite modified silicate is prepared by:
adding sulfuric acid accounting for 1-15% of the weight of the silicate and water accounting for 70-130% of the weight of the silicate into the silicate, stirring, and standing for 5-30min to obtain a material 1;
adding 0.1-2% of alcohol substance in the weight of the material 1 into the material 1, stirring uniformly, and standing for 30-60min to obtain the composite modified silicate. The modified composite silicate can be used for producing various zero-emulsion inorganic coating products and is suitable for application.
In some embodiments of the present application, the alcohol is one of monoethanolamine and triethanolamine, and the silicate is at least one of lithium silicate and sodium silicate. The water resistance and strength of the composite silicate are improved by adding the alcohol substance.
In some embodiments of the present application, the thickener is a hydroxyethyl thickener.
In some embodiments of the present application, the dispersant is an anionic dispersant. The anionic dispersant can ensure the moderate viscosity of the silicate coating and the performance of the silicate coating.
In some embodiments of the present application, the nano-sized superhydrophobic material is at least one of potassium methyl silicate and sodium methyl silicate, and the diameters of the potassium methyl silicate and the sodium methyl silicate are between 30nm and 500 nm.
In some embodiments herein, the modifier comprises 5 to 15 parts by weight of aluminum hydroxide, 0.1 to 3 parts by weight of aluminum tripolyphosphate, 0.1 to 3 parts by weight of silicon triphosphate, and 1 to 5 parts by weight of silicon phosphate. Aluminum tripolyphosphate and silicon tripolyphosphate slow release H+Synergistic curing, capable of releasing H slowly from the system after water loss+The alkali in the silicate is neutralized to achieve the effects of replacement and solidification.
The invention also provides a preparation method of the silicate coating, which comprises the following steps:
weighing the raw materials according to the parts by weight, and calcining the kaolin for 0.5-5 h;
adding a nano super-hydrophobic material and water into the composite modified silicate, stirring for 0.2-1h at 15-30 ℃, then heating to 40-70 ℃, and stirring for 1-3h to obtain a mixture 1;
adding a dispersing agent, a wetting agent, a defoaming agent and a thickening agent into the mixture 1, and uniformly stirring to obtain a mixture 2;
sequentially adding the tetrapod-like zinc oxide whiskers and the modifier into the mixture 2, and uniformly stirring to obtain a mixture 3;
adding titanium dioxide, calcined kaolin, mica powder, barium sulfate, calcium carbonate, silicon micropowder and mica powder into the mixture 3, and uniformly stirring to obtain a finished silicate coating.
In some embodiments of the present application, the calcination temperature is 700-800 ℃, and the stirring speed is 500-800 r/min.
The features and properties of the present invention are described in further detail below with reference to examples.
Example 1
A composite modified silicate is prepared by the following steps:
weighing 60g of lithium silicate, adding 0.6g of sulfuric acid with the concentration of 10% into the lithium silicate, stirring, and standing for 20min to obtain a material 1;
to material 1, 0.06g of monoethanolamine was added to obtain a composite modified lithium silicate.
Example 2
A composite modified silicate is prepared by the following steps:
weighing 60g of lithium silicate, adding 4.2g of sulfuric acid with the concentration of 10% into the lithium silicate, stirring, and standing for 20min to obtain a material 1;
to material 1, 0.6g of monoethanolamine was added to obtain a composite modified lithium silicate.
Example 3
A composite modified silicate is prepared by the following steps:
weighing 60g of lithium silicate, adding 9g of sulfuric acid with the concentration of 10% into the lithium silicate, stirring, and standing for 20min to obtain a material 1;
to material 1, 1.2g of monoethanolamine was added to obtain a composite modified lithium silicate.
Example 4
A composite modified silicate is prepared by the following steps:
weighing 60g of lithium silicate, adding 4.2g of sulfuric acid with the concentration of 10% into the lithium silicate, stirring, and standing for 20min to obtain a material 1;
to material 1 was added 0.6g of triethanolamine to obtain a composite modified lithium silicate.
Example 5
A composite modified silicate is prepared by the following steps:
weighing 60g of sodium silicate, adding 4.2g of sulfuric acid with the concentration of 10% into the lithium silicate, stirring, and standing for 20min to obtain a material 1;
0.6g of monoethanolamine was added to the material 1 to obtain composite modified sodium silicate.
Example 6
A composite modified silicate is prepared by the following steps:
460g of sodium silicate is weighed, 4.2g of sulfuric acid with the concentration of 10 percent is added into the lithium silicate, and the mixture is stirred and then stands for 20min to obtain a material 1;
and adding 0.6g of triethanolamine into the material 1 to obtain the composite modified sodium silicate.
Example 7
A preparation method of silicate paint comprises the following steps:
weighing 20g of the composite modified lithium silicate prepared in example 2, 0.1g of dispersing agent, 0.1g of hydroxyethyl thickening agent, 0.1g of defoaming agent, 0.1g of tetrapod-like zinc oxide whisker, 5g of aluminum hydroxide, 10g of kaolin, 0.1g of aluminum tripolyphosphate, 0.1g of silicon triphosphate, 5g of titanium dioxide, 1g of calcium carbonate, 1g of barium sulfate, 2g of mica powder, 1g of silicon phosphate, 0.1g of methyl potassium silicate, 0.5g of silicon micropowder and 50g of water, and calcining the kaolin at 700 ℃ for 0.5 h;
adding methyl potassium silicate into the composite modified lithium silicate, stirring for 0.2h at the speed of 800r/min at 15 ℃, 500-;
adding a dispersing agent, a wetting agent, a defoaming agent and a thickening agent into the mixture 1, and uniformly stirring at the speed of 500-800r/min to obtain a mixture 2;
sequentially adding the tetrapod-like zinc oxide whisker, the aluminum tripolyphosphate, the silicon triphosphate and the silicon phosphate into the mixture 2, and uniformly stirring at the speed of 500-800r/min to obtain a mixture 4;
adding titanium dioxide, calcined kaolin, calcined titanium dioxide, calcined mica powder, barium sulfate, calcium carbonate, silicon micropowder and mica powder into the mixture 4, and uniformly stirring at the speed of 500-800r/min to obtain a finished silicate coating.
Example 8
A preparation method of silicate paint comprises the following steps:
weighing 40g of the composite modified lithium silicate prepared in example 2, 0.5g of a dispersing agent, 0.5g of a hydroxyethyl thickener, 0.5g of an antifoaming agent, 1.5g of tetrapod-like zinc oxide whiskers, 10g of aluminum hydroxide, 12g of kaolin, 1.5g of aluminum tripolyphosphate, 1.5g of silicon triphosphate, 10g of titanium dioxide, 5g of calcium carbonate, 5g of barium sulfate, 2g of mica powder, 2g of silicon phosphate, 2.5g of potassium methyl silicate, 2.5g of silicon micropowder and 75g of water, and calcining the kaolin at 750 ℃ for 2 hours;
adding methyl potassium silicate into the mixture 1, stirring for 0.5h at the speed of 500-800r/min at the temperature of 25 ℃, and then heating to 60 ℃ and stirring for 2h to obtain a mixture 1;
adding a dispersing agent, a wetting agent, a defoaming agent and a thickening agent into the mixture 1, and uniformly stirring at the speed of 500-800r/min to obtain a mixture 2;
sequentially adding tetrapod-like zinc oxide whiskers, aluminum tripolyphosphate, silicon triphosphate and silicon phosphate into the mixture 2, and uniformly stirring to obtain a mixture 3;
adding titanium dioxide, calcined kaolin, barium sulfate, calcium carbonate, silicon micropowder and mica powder into the mixture 3, and uniformly stirring at the speed of 500-800r/min to obtain a finished silicate coating.
Example 9
A preparation method of silicate paint comprises the following steps:
weighing 60g of the composite modified lithium silicate prepared in example 2, 1g of a dispersing agent, 1g of a hydroxyethyl thickening agent, 1g of a defoaming agent, 3g of tetrapod-like zinc oxide whiskers, 15g of aluminum hydroxide, 15g of kaolin, 3g of aluminum tripolyphosphate, 3g of silicon triphosphate, 20g of titanium dioxide, 10g of calcium carbonate, 10g of barium sulfate, 5g of mica powder, 5g of silicon phosphate, 5g of potassium methyl silicate, 5g of silicon micropowder and 100g of water, and calcining the kaolin at 800 ℃ for 5 hours;
adding methyl potassium silicate into the composite modified lithium silicate, stirring for 1h at the speed of 800r/min at the temperature of 30 ℃, and then heating to 50 ℃ and stirring for 3h to obtain a mixture 1;
adding a dispersing agent, a wetting agent, a defoaming agent and a thickening agent into the mixture 1, and uniformly stirring at the speed of 500-800r/min to obtain a mixture 2;
sequentially adding tetrapod-like zinc oxide whiskers, aluminum tripolyphosphate, silicon triphosphate and silicon phosphate into the mixture 2, and uniformly stirring to obtain a mixture 3;
adding titanium dioxide, calcined kaolin, barium sulfate, calcium carbonate, silicon micropowder and mica powder into the mixture 3, and uniformly stirring at the speed of 500-800r/min to obtain a finished silicate coating.
Example 10
A preparation method of silicate paint comprises the following steps:
weighing 40g of the composite modified lithium silicate prepared in example 2, 0.5g of a dispersing agent, 0.5g of a hydroxyethyl thickening agent, 0.5g of a defoaming agent, 1.5g of tetrapod-like zinc oxide whiskers, 10g of aluminum hydroxide, 12g of kaolin, 1.5g of aluminum tripolyphosphate, 1.5g of silicon triphosphate, 10g of titanium dioxide, 5g of calcium carbonate, 5g of barium sulfate, 2g of mica powder, 2g of silicon phosphate, 2.5g of sodium methyl silicate, 2.5g of silicon micropowder and 75g of water, and calcining the kaolin at 750 ℃ for 2 hours;
adding sodium methyl silicate into the composite modified lithium silicate, stirring for 0.5h at the speed of 800r/min at 25 ℃, and then heating to 50 ℃, and stirring for 2h to obtain a mixture 1;
adding a dispersing agent, a wetting agent, a defoaming agent and a thickening agent into the mixture 1, and uniformly stirring at the speed of 500-800r/min to obtain a mixture 2;
sequentially adding tetrapod-like zinc oxide whiskers, aluminum tripolyphosphate, silicon triphosphate and silicon phosphate into the mixture 2, and uniformly stirring to obtain a mixture 3;
adding titanium dioxide, calcined kaolin, barium sulfate, calcium carbonate, silicon micropowder and mica powder into the mixture 3, and uniformly stirring at the speed of 500-800r/min to obtain a finished silicate coating.
Example 11
A preparation method of silicate paint comprises the following steps:
weighing 40g of the composite modified sodium silicate prepared in example 5, 0.5g of a dispersing agent, 0.5g of a hydroxyethyl thickening agent, 0.5g of a defoaming agent, 1.5g of tetrapod-like zinc oxide whiskers, 10g of aluminum hydroxide, 12g of kaolin, 1.5g of aluminum tripolyphosphate, 1.5g of silicon triphosphate, 10g of titanium dioxide, 5g of calcium carbonate, 5g of barium sulfate, 2g of mica powder, 2g of silicon phosphate, 2.5g of lithium methyl silicate, 2.5g of silicon micropowder and 75g of water, and calcining the kaolin at 750 ℃ for 2 hours;
adding lithium methyl silicate into the composite modified sodium silicate, stirring for 0.5h at the speed of 800r/min at 25 ℃ and 500-;
adding a dispersing agent, a wetting agent, a defoaming agent and a thickening agent into the mixture 1, and uniformly stirring at the speed of 500-800r/min to obtain a mixture 2;
sequentially adding tetrapod-like zinc oxide whiskers, aluminum tripolyphosphate, silicon triphosphate and silicon phosphate into the mixture 2, and uniformly stirring to obtain a mixture 3;
adding titanium dioxide, calcined mica powder, barium sulfate, calcium carbonate, silicon micropowder and mica powder into the mixture 3, and uniformly stirring at the speed of 500 plus 800r/min to obtain a finished silicate coating.
Example 12
A preparation method of silicate paint comprises the following steps:
weighing 40g of the composite modified sodium silicate prepared in example 5, 0.5g of a dispersing agent, 0.5g of a hydroxyethyl thickening agent, 0.5g of a defoaming agent, 1.5g of tetrapod-like zinc oxide whiskers, 10g of aluminum hydroxide, 12g of kaolin, 1.5g of aluminum tripolyphosphate, 1.5g of silicon triphosphate, 10g of titanium dioxide, 5g of calcium carbonate, 5g of barium sulfate, 2g of mica powder, 2g of silicon phosphate, 2.5g of sodium methyl silicate, 2.5g of silicon micropowder and 75g of water, and calcining the kaolin at 750 ℃ for 2 hours;
adding sodium methyl silicate into the composite modified sodium silicate, stirring for 0.5h at the speed of 800r/min at 25 ℃, and then heating to 50 ℃, and stirring for 2h to obtain a mixture 1;
adding a dispersing agent, a wetting agent, a defoaming agent and a thickening agent into the mixture 1, and uniformly stirring at the speed of 500-800r/min to obtain a mixture 2;
sequentially adding tetrapod-like zinc oxide whiskers, aluminum tripolyphosphate, silicon triphosphate and silicon phosphate into the mixture 2, and uniformly stirring to obtain a mixture 3;
adding titanium dioxide, calcined mica powder, barium sulfate, calcium carbonate, silicon micropowder and mica powder into the mixture 3, and uniformly stirring at the speed of 500 plus 800r/min to obtain a finished silicate coating.
Examples of the experiments
The silicate paints prepared in examples 7 to 12 are respectively detected according to GB18585-2020 limit of harmful substances in the wall paint for buildings and GB/T23986-2009 gas chromatography for measuring the content of Volatile Organic Compounds (VOC) in colored paint and varnish, and judged according to GB18585-2020 limit of harmful substances in the wall paint for buildings. In the detection indexes, the technical index requirement of the VOC content is less than or equal to 180g/L, and the VOC content is qualified; the technical index requirement of the formaldehyde content is less than or equal to 50mg/kg, and the formaldehyde content is qualified; the technical index requirement of the total content of the benzene series (benzene, toluene, dimethylbenzene and ethylbenzene) is qualified when the content is less than or equal to 100mg/kg, and the technical index requirement of the total lead content is qualified when the content is less than or equal to 90 mg/kg; the technical index of the content of the soluble heavy metal requires that the cadmium content is less than or equal to 75mg/kg to be qualified, the chromium content is less than or equal to 60mg/kg to be qualified, and the mercury content is less than or equal to 60mg/kg to be qualified; the total content of alkylphenol ethoxylates is qualified when the technical index requirement is less than or equal to 1000mg/kg
The results are shown in Table 1.
TABLE 1
Analysis of table 1 shows that the silicate coating finished products prepared in examples 7 to 12 are qualified in the detection of the total content of VOC, methanol and benzene compounds, total lead, soluble heavy metals and total content of alkylphenol ethoxylates, so that the silicate coating prepared in the present application is environment-friendly and is not detected except the total lead content, and thus the silicate coating prepared in the present application has a low content of harmful substances; the analysis of the comparison shows that the silicate paint prepared in example 11 has the lowest total lead content.
(II) the silicate coatings prepared in the examples 7 to 12 are respectively detected according to GB50222-2017 'fire codes for interior decoration design of buildings' and GB8624-2012 'grading for combustion performance of building materials and products', the detection results are shown in Table 2, and the condition that the combustion heat value is less than or equal to 2MJ/kg is qualified; in the incombustibility test, the temperature rise in the furnace is not more than 30 ℃ and is qualified, the continuous combustion time is 0s and is qualified, and the mass loss rate is not more than 50 percent and is qualified.
TABLE 2
The analysis and comparison of table 2 show that the silicate coating finished products prepared in examples 7 to 12 are qualified in the detection results of the combustion heat value, the temperature rise in the furnace, the continuous combustion time and the mass loss rate, and the numerical values are greatly different from the qualified standards, and the results in table 2 show that the silicate coating finished products prepared in the application have better fireproof and flame-retardant properties and meet the combustion performance a (a1) standard in GB8624-2012 classification of combustion performance of building materials and products.
And (III) the silicate coatings prepared in examples 7-12 are respectively detected according to 20285-.
TABLE 3
As can be seen from the analysis of Table 3, the finished silicate paints prepared in examples 7-12 meet the detection standard of grade AQ1 of smoke toxicity produced in 20285-2006 Material Smoke toxicity Risk Classification.
(IV) the silicate paint finished products prepared in examples 8, 10 and 11 were respectively tested according to JG/T26-2002 inorganic building coating for exterior wall and GB/T1728-1979(89) determination method for drying time of paint film and putty film, and judged according to JG/T26-2002 inorganic building coating for exterior wall, and the test results are shown in Table 4, Table 5 and Table 6. The silicate coating is stirred in a container without agglomeration and is qualified in a uniform state; the workability is that the brush coating is qualified after two-pass barrier-free brushing; the smearing appearance is normal and qualified; the comparative example is not less than 0.95 is qualified; the thermal storage stability of 30 days is qualified as no caking, agglomeration and mildewing phenomena; the low-temperature storage stability of 30 days is qualified as no caking or agglomeration; the surface drying time is less than or equal to 2h, and the product is qualified; the washing resistance is qualified when the washing resistance is more than or equal to 1000 times; 168h water resistance is no bubbling, cracking or peeling, and slight powder falling is allowed to be qualified; 168h alkali resistance is no bubbling, cracking or peeling, and slight powder falling is allowed to be qualified; the 10 times of temperature change resistance is no bubbling, cracking or peeling, and slight powder falling is allowed to be qualified; the stain resistance of less than 20 percent is qualified.
TABLE 4
TABLE 5
TABLE 6
The analysis and comparison of tables 4-6 show that the finished silicate coatings prepared in examples 8, 10 and 11 meet the detection standard of JG/T26-2002 inorganic building coating for exterior walls, and the silicate coatings prepared in the application have better water resistance, corrosion resistance, alkali resistance, temperature change resistance and stain resistance.
Fifth, the silicate paint finished products prepared in examples 7 to 12 were respectively tested according to GB/T1741-2007 "determination method for mildew resistance of paint film", and the test results are shown in Table 7.
TABLE 7
As can be seen from Table 7, the silicate paint products prepared in examples 7-12 are all 0-grade, and no significant mold growth occurs under the magnification of about 50 times, so that the silicate paint products prepared in the application have outstanding mold resistance.
In conclusion, the main raw material used for preparing the silicate coating is the composite modified silicate, and the raw material is the silicate (at least one of potassium silicate and sodium silicate), and the petrochemical raw material is used as a film forming material, so that the environmental protection property of the product is ensured, and the raw material is cheap and easy to obtain; the tetrapod-like zinc oxide whiskers are modified by silicon triphosphate and aluminum triphosphate to form a quadriversal structure, the fireproof and flame-retardant performance is outstanding, crystal water in a system can be quickly released when flame above 1000 ℃ is encountered, and the tetrapod-like zinc oxide whiskers extend outwards in an annular structure to play a role in fireproof and flame-retardant; the water resistance of the coating is improved by replacing and modifying the composite modified silicate modified by sulfuric acid with silicon triphosphate and aluminum tripolyphosphate; the quadriversal net structure formed by the super-hydrophobic nano material, the methyl silicate and the tetrapod-like zinc oxide whiskers has high strength and can generate strong adhesive force, so that the structure is firm and is not easy to fall off when the super-hydrophobic nano material is coated on a wall; the formed silicate coating is alkalescent, and because the optimum pH value for bacterial growth is 7.2-7.6, the formed quadriversal zinc oxide whiskers and the alkalescent environment can inhibit the formation and survival of mold, and the prepared coating has an antibacterial effect; the coating can be breathable and waterproof under the compounding of the methyl silicate and the zinc oxide whisker, and the dryness of the coating is kept, so that the prepared coating has better durability.
The embodiments described above are some, but not all embodiments of the invention. The detailed description of the embodiments of the present invention is not intended to limit the scope of the invention as claimed, but is merely representative of selected embodiments of the 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.
Claims (10)
1. The silicate coating is characterized by comprising the following raw materials in parts by weight: 20-60 parts of composite modified silicate, 0.1-1 part of dispersant, 0.1-1 part of thickener, 0.1-1 part of defoamer, 0.1-3 parts of tetrapod-like zinc oxide whisker, 6.2-26 parts of modifier, 10-15 parts of kaolin, 5-20 parts of titanium dioxide, 1-10 parts of calcium carbonate, 1-10 parts of barium sulfate, 1-5 parts of mica powder, 0.5-5 parts of nano super-hydrophobic material, 0.5-5 parts of silicon micropowder and 50-100 parts of water.
2. A silicate coating according to claim 1, wherein said composite modified silicate is prepared by the steps of:
adding sulfuric acid accounting for 1-15% of the weight of the silicate and water accounting for 70-130% of the weight of the silicate into the silicate, stirring, and standing for 5-30min to obtain a material 1;
adding 0.1-2% of alcohol substance in the weight of the material 1 into the material 1, stirring uniformly, and standing for 30-60min to obtain the composite modified silicate.
3. A silicate paint according to claim 2, wherein the concentration of sulfuric acid is 10%.
4. A silicate paint as claimed in claim 2, wherein said alcohol is one of monoethanolamine and triethanolamine, and said silicate is at least one of lithium silicate and sodium silicate.
5. A silicate paint according to claim 1, wherein said thickener is a hydroxyethyl thickener.
6. A silicate coating according to claim 1, wherein said dispersant is an anionic dispersant.
7. The silicate coating according to claim 1, wherein the nano-sized superhydrophobic material is at least one of potassium methyl silicate and sodium methyl silicate.
8. A silicate paint as claimed in claim 1, wherein said modifier comprises 5-15 parts by weight of aluminium hydroxide, 0.1-3 parts by weight of aluminium triphosphate, 0.1-3 parts by weight of silicon triphosphate and 1-5 parts by weight of silicon phosphate.
9. A process for the preparation of a silicate coating according to any of claims 1-8, comprising the steps of:
weighing the raw materials according to the parts by weight, and calcining the kaolin for 0.5-5 h;
adding a nano super-hydrophobic material and water into the composite modified silicate, stirring for 0.2-1h at 15-30 ℃, then heating to 40-70 ℃, and stirring for 1-3h to obtain a mixture 1;
adding a dispersing agent, a wetting agent, a defoaming agent and a thickening agent into the mixture 1, and uniformly stirring to obtain a mixture 2;
sequentially adding the tetrapod-like zinc oxide whiskers and the modifier into the mixture 2, and uniformly stirring to obtain a mixture 3;
adding titanium dioxide, calcined kaolin, mica powder, barium sulfate, calcium carbonate, silicon micropowder and mica powder into the mixture 3, and uniformly stirring to obtain a finished silicate coating.
10. The method as claimed in claim 9, wherein the calcination temperature is 700-800 ℃, and the stirring speed is 500-800 r/min.
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| CN116970297A (en) * | 2023-09-13 | 2023-10-31 | 广东力达新材料科技有限公司 | Preparation method of inorganic coating |
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