CN114250029B - Waterproof coating and preparation method thereof - Google Patents
Waterproof coating and preparation method thereof Download PDFInfo
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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
- C09D167/00—Coating compositions based on polyesters obtained by reactions forming a carboxylic ester link in the main chain; Coating compositions based on derivatives of such polymers
- C09D167/08—Polyesters modified with higher fatty oils or their acids, or with natural resins or resin acids
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- C09D133/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers
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- C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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- 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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- 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
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- C09D7/62—Additives non-macromolecular inorganic modified by treatment with other compounds
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- 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
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- 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
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- C08K2003/2227—Oxides; Hydroxides of metals of aluminium
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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Abstract
The invention discloses a waterproof coating and a preparation method thereof. The preparation method comprises the following steps: (1) preparing nano diamond powder; (2) preparing aluminum hydroxide coated nano diamond powder; (3) preparing sheet mesoporous scales; (4) preparing a composite dispersion; (5) and (3) preparing the waterproof coating. According to the invention, the flaky mesoporous scales with aluminum hydroxide coated nano diamond powder adsorbed on the surface in the composite dispersion and the charcoal powder are stacked in the coating in a staggered manner in a plurality of layers to form a plurality of barrier layers, and the synergistic effect of aluminum oxide on the surface is added to further improve the waterproof and moistureproof characteristics; the nano diamond powder coated in the alumina is uniformly adsorbed in the scales and the charcoal powder, and the scratch resistance and wear resistance of the coating can be effectively improved after the film is formed.
Description
Technical Field
The invention relates to the technical field of coatings, in particular to a waterproof coating and a preparation method thereof.
Background
The water-based high-molecular paint is a polymer paint which uses water as a solvent or a dispersion medium, has few organic volatile matters, no pungent smell, environmental protection and health, is a novel and popular paint in the paint market, and is widely used for furniture and interior decoration. However, continuous pores are formed in the existing waterproof coating in the film forming process, the pore diameter of the existing waterproof coating is about 5-15 nm, and although the existing waterproof coating has a certain waterproof effect locally, the existing waterproof coating can still permeate water vapor molecules to damage the coating structure, and actually does not have the waterproof and moistureproof effects; meanwhile, the existing waterproof coating achieves certain scratch resistance and wear resistance by additionally adding fillers such as nano aluminum oxide, graphite powder and talcum powder, but not only the cost of the fillers is increased, but also the problem of film forming uniformity caused by filler aggregation easily exists. Therefore, how to improve the waterproof performance and the scratch resistance of the existing waterproof coating to achieve good waterproof, moistureproof and scratch resistance is a technical problem to be solved in the field at present.
Disclosure of Invention
In order to solve the problems of the prior art, the invention provides a waterproof coating and a preparation method thereof, which aim to solve the problems that the existing waterproof coating does not have waterproof and moistureproof effects and has reduced scratch resistance and wear resistance.
The technical problem to be solved by the invention is realized by the following technical scheme:
a preparation method of a waterproof coating comprises the following steps:
(1) preparation of Nanodiamond Diamond powder
(2) Preparation of aluminum hydroxide-coated NanoDiamond powder
Dispersing the nano-diamond powder prepared in the step (1) in water to form a water dispersion, adding sodium aluminate into the water dispersion, and uniformly stirring; adding aqueous solution of nitric acid to adjust the pH to be in a strong alkali state, keeping for a period of time, adding aqueous solution of nitric acid to adjust the pH to be in a weak alkali state, and drying at a certain temperature to obtain aluminum hydroxide coated nano diamond powder;
(3) preparation of flaky mesoporous flake
Mixing alkaline silica sol and glycerol to prepare sol for dripping; adding isopropanol into a beaker, and then dropwise adding the sol under the stirring state; centrifuging to separate an aggregate of colloidal particles from isopropyl alcohol in which the colloidal particles are aggregated into a slurry, washing the aggregate with propyl alcohol, decanting to remove propyl alcohol, and vacuum-drying at a certain temperature to obtain a sheet-like mesoporous flake;
(4) preparation of composite Dispersion
Dispersing the flaky mesoporous flake prepared in the step (3) and charcoal powder in water according to the weight ratio of 1:1, wherein the solute concentration is 15-25%, and the dispersion 1 is obtained; dispersing the aluminum hydroxide coated nano diamond powder prepared in the step (2) in water, wherein the solute concentration is 30-40%, and the dispersion 2 is obtained; then dropwise adding the dispersoid 2 into the dispersoid 1 under the stirring state; continuously stirring, and drying at a certain temperature to obtain composite powder; and calcining the composite powder at a high temperature, and dispersing the calcined composite powder in water to form a composite dispersion with the solute concentration of 30-40%.
(5) Preparation of Water-proof paint
Mixing and dispersing 20-30 parts of aqueous coating emulsion, 2-8 parts of composite dispersion and 25-35 parts of water by weight for 5-120 min by using mixing and dispersing equipment.
In the invention, the step (1) is specifically as follows: synthesizing single crystal nano diamond particles by a high-temperature high-pressure method; and then, when the single crystal nano diamond particles are subjected to heat treatment, keeping the temperature of 580-620 ℃ for 300-320 minutes to obtain white nano diamond powder, namely nano diamond powder.
In the invention, the particle size of the nano diamond powder is 80-130 nm.
In the invention, the step (2) is specifically as follows: dispersing the nano-diamond powder prepared in the step (1) in water to form an aqueous dispersion, wherein the concentration of the nano-diamond powder in the aqueous dispersion is 15-25 wt%; adding 40-50 parts by weight of sodium aluminate into the aqueous dispersion, and uniformly stirring; adding 9.9wt% nitric acid aqueous solution to adjust the pH to 11.5, keeping the obtained dispersion at the pH of 10.6-11.5 for 60 minutes, further adding 9.9wt% nitric acid aqueous solution to adjust the pH to 10, and drying at 102-105 ℃ for 3 hours to obtain the aluminum hydroxide coated nano diamond powder.
In the present invention, the step (3) is specifically: mixing the alkaline silica sol and glycerol according to the mass ratio of 50-60: 40-50 to prepare sol for dripping; adding 50ml of isopropanol into a beaker, and then dropwise adding 0.01g of the sol under stirring to totally add 1 g; centrifuging to separate an aggregate of colloidal particles from isopropyl alcohol in which the colloidal particles are aggregated into a slurry, washing the aggregate with propyl alcohol, decanting to remove propyl alcohol, and vacuum-drying at 145-150 ℃ for 6 hours to obtain a sheet-like mesoporous flake having a thickness in the range of 1.5-2 μm.
In the present invention, the alkaline silica sol is Silicadol30S manufactured by Nippon chemical industries.
In the present invention, the step (4) specifically comprises: dispersing the flaky mesoporous scales prepared in the step (3) and charcoal powder with the central particle size of 0.3-0.4 mu m in water according to the weight ratio of 1:1, wherein the solute concentration is 15-25%, and the dispersion 1 is obtained; dispersing the aluminum hydroxide coated nano diamond powder prepared in the step (2) in water, wherein the solute concentration is 30-40%, and the dispersion 2 is obtained; then dropwise adding the dispersoid 2 into the dispersoid 1 under the stirring state, wherein the volume ratio of the dispersoid 1 to the dispersoid 2 is 1: 1.5; continuously stirring for 60 minutes, and drying at 105 ℃ for 6 hours to obtain composite powder; and calcining the composite powder at 1000 ℃ for 4 hours, and dispersing the calcined composite powder in water to form a composite dispersion with the solute concentration of 30-40%.
In the present invention, the aqueous coating emulsion includes any 1 or a combination of at least 2 of an aqueous acrylic urethane-based emulsion coating, an aqueous acrylic-based emulsion coating, an aqueous urethane-based emulsion coating, an aqueous alkyd-based emulsion coating, an aqueous epoxy-based emulsion coating, or an aqueous polyester-based emulsion coating.
The aqueous coating emulsion of the invention can be selected from finished coatings, coating varnishes and the like, such as commercially available finished coating emulsions or coating varnishes used in the process of preparing coatings. In order to provide other properties to the coating, it is also possible to add, for example, dispersants, anti-aging agents, wetting agents, defoamers, leveling agents, thickeners, and the like.
A waterproof coating is prepared by the preparation method.
The invention has the following beneficial effects:
according to the invention, the flaky mesoporous scales with aluminum hydroxide coated nano diamond powder adsorbed on the surface in the composite dispersion and the charcoal powder are stacked in the coating in a staggered manner in a plurality of layers to form a plurality of barrier layers, and the synergistic effect of aluminum oxide on the surface is added to further improve the waterproof and moistureproof characteristics; the nano diamond powder coated in the alumina is uniformly adsorbed in the scales and the charcoal powder, and the scratch resistance and wear resistance of the coating can be effectively improved after the film is formed. According to the invention, the nano diamond powder, the aluminum hydroxide, the aluminum oxide, the flaky flakes and the charcoal powder are coated and mixed under specific conditions, and the raw materials are synergistic, so that the waterproof coating has high waterproof property and high scratch and wear resistance, namely, the scratch and wear resistance is improved simultaneously under the condition that the waterproof property of the waterproof coating is improved through the composite dispersion, and the scratch and wear resistance is realized without additionally adding a specific filler.
Detailed Description
The present invention will be described in detail with reference to examples, which are only preferred embodiments of the present invention and are not intended to limit the present invention.
Example 1
The embodiment provides a preparation method of a waterproof coating, which comprises the following steps:
(1) preparation of Nanodiamond Diamond powder
Synthesizing single crystal nano diamond particles by a High Pressure and High Temperature (HPHT) method; and then, when the single crystal nano diamond particles are subjected to heat treatment, keeping the temperature at 600 ℃ for 300 minutes to obtain white nano diamond powder which is grey white (greyish white), namely the high-dispersity nano diamond powder with the particle size of about 80-130 nm.
(2) Preparation of aluminum hydroxide-coated NanoDiamond powder
Dispersing the nano-diamond powder prepared in the step (1) in water to form an aqueous dispersion, wherein the concentration of the nano-diamond powder in the aqueous dispersion is 15 wt%. Adding 50 parts by weight of sodium aluminate into the aqueous dispersion, and uniformly stirring; adding 9.9wt% nitric acid aqueous solution to adjust the pH to 11.5, keeping the obtained dispersion at the pH of 10.6-11.5 for 60 minutes, further adding 9.9wt% nitric acid aqueous solution to adjust the pH to 10, and drying at 102-105 ℃ for 3 hours to obtain the aluminum hydroxide coated nano diamond powder.
(3) Preparation of flaky mesoporous flake
An alkaline silica sol ("Silicasol 30S" manufactured by Nippon chemical industries) and glycerin were mixed at a mass ratio of 50:50 to prepare a sol for dropwise addition. 50ml of isopropyl alcohol was added to a beaker, and then 0.01g of the above sol was added dropwise with stirring to 1g in total. Centrifuging to separate an aggregate of colloidal particles from isopropyl alcohol in which the colloidal particles are aggregated into a slurry, washing the aggregate with propyl alcohol, decanting to remove propyl alcohol, and vacuum-drying at 145-150 ℃ for 6 hours to obtain a sheet-like mesoporous flake having a thickness in the range of 1.5-2 μm.
(4) Preparation of composite Dispersion
Dispersing the flaky mesoporous scale prepared in the step (3) and charcoal powder with the central particle size of 0.3-0.4 mu m in water according to the weight ratio of 1:1, wherein the solute concentration is 25%, and the dispersion 1 is obtained; dispersing the aluminum hydroxide coated nano diamond powder prepared in the step (2) in water, wherein the solute concentration is 40%, and the dispersion 2 is obtained; then, dropwise adding the dispersoid 2 into the dispersoid 1 under the stirring state, wherein the volume ratio of the dispersoid 1 to the dispersoid 2 is 1: 1.5; continuously stirring for 60 minutes, and drying for 6 hours at 105 ℃ to obtain composite powder; the composite powder was then calcined at 1000 ℃ for 4 hours and then dispersed in water to form a composite dispersion with a solute concentration of 30%.
(5) Preparation of Water-proof paint
Mixing and dispersing 28 parts of aqueous alkyd emulsion coating, 5 parts of composite dispersion and 25 parts of water for 90min by using mixing and dispersing equipment according to parts by weight.
Example 2
The embodiment provides a preparation method of a waterproof coating, which comprises the following steps:
(1) preparation of Nanodiamond Diamond powder
Synthesizing single crystal nano diamond particles by a High Pressure and High Temperature (HPHT) method; and then, when the single crystal nano diamond particles are subjected to heat treatment, keeping the heat treatment at 600 ℃ for 300 minutes to obtain white nano diamond powder which is grey white (greyish white), namely the high-dispersity nano diamond powder with the particle size of about 80-130 nm.
(2) Preparation of aluminum hydroxide-coated NanoDiamond powder
Dispersing the nano-diamond powder prepared in the step (1) in water to form an aqueous dispersion, wherein the concentration of the nano-diamond powder in the aqueous dispersion is 20 wt%. Adding 45 parts by weight of sodium aluminate into the aqueous dispersion, and uniformly stirring; adding 9.9wt% nitric acid aqueous solution to adjust the pH to 11.5, keeping the obtained dispersion at the pH of 10.6-11.5 for 60 minutes, further adding 9.9wt% nitric acid aqueous solution to adjust the pH to 10, and drying at 102-105 ℃ for 3 hours to obtain the aluminum hydroxide coated nano diamond powder.
(3) Preparation of flaky mesoporous flake
An alkaline silica sol ("Silicasol 30S" manufactured by Nippon chemical industries) and glycerin were mixed at a mass ratio of 55:45 to prepare a sol for dropwise addition. 50ml of isopropyl alcohol was added to a beaker, and then 0.01g of the above sol was added dropwise with stirring to 1g in total. Centrifuging to separate an aggregate of colloidal particles from isopropyl alcohol in which the colloidal particles are aggregated into a slurry, washing the aggregate with propyl alcohol, decanting to remove propyl alcohol, and vacuum-drying at 145-150 ℃ for 6 hours to obtain a sheet-like mesoporous flake having a thickness in the range of 1.5-2 μm.
(4) Preparation of composite Dispersion
Dispersing the flaky mesoporous scale prepared in the step (3) and charcoal powder with the central particle size of 0.3-0.4 mu m in water according to the weight ratio of 1:1, wherein the solute concentration is 20%, and the dispersion 1 is obtained; dispersing the aluminum hydroxide coated nano diamond powder prepared in the step (2) in water, wherein the solute concentration is 35%, and the dispersion is dispersion 2; then dropwise adding the dispersoid 2 into the dispersoid 1 under the stirring state, wherein the volume ratio of the dispersoid 1 to the dispersoid 2 is 1: 1.5; continuously stirring for 60 minutes, and drying at 105 ℃ for 6 hours to obtain composite powder; the composite powder was then calcined at 1000 ℃ for 4 hours and then dispersed in water to form a composite dispersion with a solute concentration of 35%.
(5) Preparation of Water-proof paint
28 parts by weight of the aqueous acrylic emulsion coating, 5 parts by weight of the composite dispersion and 25 parts by weight of water were mixed and dispersed for 90 minutes by using a mixing and dispersing apparatus.
Example 3
The embodiment provides a preparation method of a waterproof coating, which comprises the following steps:
(1) preparation of Nanodiamond Diamond powder
Synthesizing single crystal nano diamond particles by a High Pressure and High Temperature (HPHT) method; and then, when the single crystal nano diamond particles are subjected to heat treatment, keeping the temperature at 600 ℃ for 300 minutes to obtain white nano diamond powder which is grey white (greyish white), namely the high-dispersity nano diamond powder with the particle size of about 80-130 nm.
(2) Preparation of aluminum hydroxide-coated NanoDiamond powder
Dispersing the nano-diamond powder prepared in the step (1) in water to form an aqueous dispersion, wherein the concentration of the nano-diamond powder in the aqueous dispersion is 25 wt%. Adding 40 parts by weight of sodium aluminate into the aqueous dispersion, and uniformly stirring; adding 9.9wt% nitric acid aqueous solution to adjust the pH to 11.5, keeping the obtained dispersion at the pH of 10.6-11.5 for 60 minutes, further adding 9.9wt% nitric acid aqueous solution to adjust the pH to 10, and drying at 102-105 ℃ for 3 hours to obtain the aluminum hydroxide coated nano diamond powder.
(3) Preparation of flaky mesoporous flake
An alkaline silica sol ("Silicasol 30S" manufactured by Nippon chemical industries) and glycerin were mixed at a mass ratio of 60:40 to prepare a sol for dropwise addition. 50ml of isopropyl alcohol was added to a beaker, and then 0.01g of the above sol was added dropwise with stirring to 1g in total. Centrifuging to separate an aggregate of colloidal particles from isopropyl alcohol in which the colloidal particles are aggregated into a slurry, washing the aggregate with propyl alcohol, decanting to remove propyl alcohol, and vacuum-drying at 145-150 ℃ for 6 hours to obtain a sheet-like mesoporous flake having a thickness in the range of 1.5-2 μm.
(4) Preparation of composite Dispersion
Dispersing the flaky mesoporous scale prepared in the step (3) and charcoal powder with the central particle size of 0.3-0.4 mu m in water according to the weight ratio of 1:1, wherein the solute concentration is 15%, and the dispersion 1 is obtained; dispersing the aluminum hydroxide coated nano diamond powder prepared in the step (2) in water, wherein the solute concentration is 30%, and the dispersion 2 is obtained; then dropwise adding the dispersoid 2 into the dispersoid 1 under the stirring state, wherein the volume ratio of the dispersoid 1 to the dispersoid 2 is 1: 1.5; continuously stirring for 60 minutes, and drying at 105 ℃ for 6 hours to obtain composite powder; the composite powder was then calcined at 1000 ℃ for 4 hours and then dispersed in water to form a composite dispersion with a solute concentration of 40%.
(5) Preparation of Water-proof paint
Mixing and dispersing 28 parts of waterborne epoxy resin-based emulsion paint, 5 parts of composite dispersion and 25 parts of water for 90min by using mixing and dispersing equipment according to parts by weight.
Comparative example 1
The present comparative example provides a method of preparing a waterproof coating comprising the steps of: 28 parts of an aqueous acrylic emulsion coating, 5 parts of a dispersion (specifically, sheet-like mesoporous flakes prepared in step (3) in example 2 were dispersed in water with a solute concentration of 15%) and 25 parts of water were mixed and dispersed for 90min using a mixing and dispersing apparatus.
Comparative example 2
The present comparative example provides a method of preparing a waterproof coating comprising the steps of: 28 parts by weight of an aqueous acrylic emulsion coating, 5 parts by weight of dispersion 2 (see specifically dispersion 2 of step (4) in example 2), and 25 parts by weight of water were mixed and dispersed for 90 minutes using a mixing and dispersing apparatus.
Comparative example 3
This comparative example differs from example 2 in that: charcoal powder is not added into the dispersion 1 in the step (4).
Performance test analysis
The paint adhesion of the paint in the example 2 and the comparative examples 1 to 4 is respectively tested according to the GB/T9286-1998 test for drawing a grid of colored paint and varnish; the impermeability after temperature change circulation is tested according to JG/T25-2017 'test method for building coating temperature change resistance' and GB/T16777-2008 'test method for building waterproof coating', the high temperature and low temperature parameters are respectively 100 ℃ and-30 ℃, the hardness test is carried out according to GB/T6739-.
TABLE 1 Performance test results for the coatings
Comparative example 1 is through adding slice mesoporous scale, and the scale is crisscross to be piled up and is played waterproof effect to a certain extent after the membrane forming, but the scale still can have some gaps after crisscross piling up, because water permeability is very strong, still can permeate into after the certain time, still wait to improve waterproof performance, do not have the scratch resistance simultaneously. Comparative example 2 does not form a staggered stacked structure, so the waterproof performance is general, aluminum hydroxide is not subjected to any heat treatment, and the surface of the aluminum hydroxide has certain defects such as pores or concave-convex surfaces by adopting an in-situ synthesis method, so that the film-formed aluminum hydroxide also has certain water absorption and is not beneficial to waterproofing; however, the nano diamond powder in the dispersion 2 improves the scratch resistance to a certain extent. In the embodiment 2 of the present invention, a large amount of aluminum hydroxide coated nano-diamond powder is adsorbed on the sheet-shaped mesoporous flakes, and then the surface of the aluminum hydroxide coated nano-diamond powder is calcined to form aluminum oxide, the calcined aluminum oxide has good crystallinity and a compact structure and is not easy to absorb water, in addition, charcoal powder with the aluminum oxide coated nano-diamond powder also adsorbed on the surface is added, the particle size of the sheet-shaped mesoporous flakes is about 1.5 to 2 μm, and the particle size of the charcoal powder is about 0.3 to 0.4 μm, the charcoal powder with small particle size adsorbing the aluminum oxide coated nano-diamond powder can enter between the sheet-shaped mesoporous flakes adsorbing the aluminum oxide coated nano-diamond powder during film formation, so as to improve the uniformity of the filling state, the coating surface of the coating is uniform (uniform film thickness), and the coating surfaces complement each other to form a more complex and staggered lap joint structure, thereby greatly reducing the number of gaps, and further reducing the amount of permeated water; even if a small part of water still permeates, the water permeating path can be greatly prolonged; meanwhile, charcoal powder is uniformly distributed on the coating after film forming, and alumina coated with nano diamond powder is adsorbed on the surface of the flake, so that the scratch resistance and wear resistance can be effectively improved.
Stability of the coating
The coatings of example 2 and comparative example 3 were stirred and the container was allowed to stand, and the presence or absence of precipitation at the bottom of the container and the properties (viscosity) of the coating were determined after 1 week at a temperature of 25 ℃. + -. 2. The presence or absence of the precipitate and the viscosity at the bottom of the container were determined using a spatula made of plastic (width 2cm, thickness 2 mm). The existence of the precipitate in comparative example 3 and no precipitate in example 2 may be considered that the existence of two kinds of flaky mesoporous flakes having different particle sizes and charcoal powder in example 2 increases the viscosity of the paint compared to the addition of flaky mesoporous flakes having a single particle size to the paint, and it is difficult to generate powder precipitate having a large particle size when the paint is stored or left to stand, i.e., the storage stability is good.
The above-mentioned embodiments only express the embodiments of the present invention, and the description is more specific and detailed, but not understood as the limitation of the patent scope of the present invention, but all the technical solutions obtained by using the equivalent substitution or the equivalent transformation should fall within the protection scope of the present invention.
Claims (7)
1. The preparation method of the waterproof coating is characterized by comprising the following steps:
(1) preparation of Nanodiamond Diamond powder
(2) Preparation of aluminum hydroxide-coated NanoDiamond powder
Dispersing the nano-diamond powder prepared in the step (1) in water to form a water dispersion, adding sodium aluminate into the water dispersion, and uniformly stirring; adding aqueous solution of nitric acid to adjust the pH to be in a strong alkali state, keeping for a period of time, adding aqueous solution of nitric acid to adjust the pH to be in a weak alkali state, and drying at a certain temperature to obtain aluminum hydroxide coated nano diamond powder;
(3) preparation of flaky mesoporous flake
Mixing alkaline silica sol and glycerol to prepare sol for dripping; adding isopropanol into a beaker, and then dropwise adding the sol under the stirring state; centrifuging to separate an aggregate of colloidal particles from isopropyl alcohol in which the colloidal particles are aggregated into a slurry, washing the aggregate with propyl alcohol, decanting to remove propyl alcohol, and vacuum-drying at a certain temperature to obtain a sheet-like mesoporous flake;
(4) preparation of composite Dispersion
Dispersing the flaky mesoporous scales prepared in the step (3) and charcoal powder with the central particle size of 0.3-0.4 mu m in water according to the weight ratio of 1:1, wherein the solute concentration is 15-25%, and the dispersion 1 is obtained; dispersing the aluminum hydroxide coated nano diamond powder prepared in the step (2) in water, wherein the solute concentration is 30-40%, and the dispersion 2 is obtained; then dropwise adding the dispersoid 2 into the dispersoid 1 under the stirring state, wherein the volume ratio of the dispersoid 1 to the dispersoid 2 is 1: 1.5; continuously stirring for 60 minutes, and drying for 6 hours at 105 ℃ to obtain composite powder; calcining the composite powder at 1000 ℃ for 4 hours, and dispersing the calcined composite powder in water to form a composite dispersion with solute concentration of 30-40%;
(5) preparation of Water-proof paint
Mixing and dispersing 20-30 parts of aqueous coating emulsion, 2-8 parts of composite dispersion and 25-35 parts of water by weight for 5-120 min by using mixing and dispersing equipment.
2. The preparation method of the waterproof coating material according to claim 1, wherein the step (1) is specifically: synthesizing single crystal nano diamond particles by a high-temperature high-pressure method; and then, when the single crystal nano diamond particles are subjected to heat treatment, keeping the temperature of 580-620 ℃ for 300-320 minutes to obtain white nano diamond powder, namely nano diamond powder.
3. The preparation method of the waterproof coating material according to claim 1, wherein the particle size of the nano diamond powder is 80-130 nm.
4. The preparation method of the waterproof coating material according to claim 1, wherein the step (2) is specifically: dispersing the nano-diamond powder prepared in the step (1) in water to form an aqueous dispersion, wherein the concentration of the nano-diamond powder in the aqueous dispersion is 15-25 wt%; adding 40-50 parts by weight of sodium aluminate into the aqueous dispersion, and uniformly stirring; adding 9.9wt% nitric acid aqueous solution to adjust the pH to 11.5, keeping the obtained dispersion at the pH of 10.6-11.5 for 60 minutes, further adding 9.9wt% nitric acid aqueous solution to adjust the pH to 10, and drying at 102-105 ℃ for 3 hours to obtain the aluminum hydroxide coated nano-diamond powder.
5. The preparation method of the waterproof coating material according to claim 1, wherein the step (3) is specifically: mixing alkaline silica sol and glycerol according to the mass ratio of 50-60: 40-50, and preparing sol for dripping; adding 50ml of isopropanol into a beaker, and then dropwise adding 0.01g of the sol under stirring to totally add 1 g; centrifuging to separate an aggregate of colloidal particles from isopropyl alcohol in which the colloidal particles are aggregated into a slurry, washing the aggregate with propyl alcohol, decanting to remove propyl alcohol, and vacuum-drying at 145-150 ℃ for 6 hours to obtain a sheet-like mesoporous flake having a thickness in the range of 1.5-2 μm.
6. The method for preparing a waterproof coating material according to claim 1, wherein the alkali silica sol is Silicadol30S manufactured by Nippon chemical industry.
7. A waterproof paint, which is produced by the production method according to claim 1.
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| US6025025A (en) * | 1990-04-03 | 2000-02-15 | Ppg Industries Ohio, Inc. | Water-repellent surface treatment |
| CN100569872C (en) * | 2005-12-31 | 2009-12-16 | 白日忠 | The preparation method of nanometer scale coating |
| JP5870041B2 (en) * | 2011-01-11 | 2016-02-24 | 日本板硝子株式会社 | Flaked mesoporous granules and method for producing the same |
| CN102974348B (en) * | 2011-09-07 | 2015-06-03 | 中国科学院金属研究所 | Oxide-supported nanodiamond catalyst and preparation method and applications thereof |
| CN104028171A (en) * | 2014-06-23 | 2014-09-10 | 大连理工大学 | Detonation preparation method for alumina-adhered diamond nano composite particle material |
| CN106752645A (en) * | 2016-12-12 | 2017-05-31 | 墨宝股份有限公司 | A kind of Nano diamond heat dissipation, energy conservation environment-friendlythin thin film coating and its preparation application method |
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