CN109957263B - Organic-inorganic water-based quick-drying coating and preparation method and film forming method thereof - Google Patents
Organic-inorganic water-based quick-drying coating and preparation method and film forming method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D1/00—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances
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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
- C09D183/00—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Coating compositions based on derivatives of such polymers
- C09D183/04—Polysiloxanes
- C09D183/08—Polysiloxanes containing silicon bound to organic groups containing atoms other than carbon, hydrogen, and oxygen
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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
- C09D5/08—Anti-corrosive paints
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Abstract
The invention discloses an organic-inorganic water-based quick-drying coating, a preparation method and a film forming method thereof. The organic-inorganic water-based quick-drying paint comprises the following components in percentage by weight: coupling agent A: 16.5-23.5 wt%; a coupling agent B: 16.5-23.5 wt%; nano aluminum sol: 15.5-23.5 wt%; pigment and filler: 17.5-23.5 wt%; anti-settling agent: 0.2-2 wt%; wetting and dispersing agent: 0.5-2.5 wt%; an anti-sticking agent: 0.5-2 wt%; leveling agent: 0.5-2 wt%; deionized water: 15 to 19 wt%. The paint disclosed by the invention is green and environment-friendly, can form a film in about one minute in a mixed drying mode of high-temperature baking at 120-140 ℃ and electromagnetic heating with power of 90-150w, can keep better appearance and anticorrosion capability, and can be used as a baking type paint.
Description
Technical Field
The invention relates to an organic-inorganic water-based quick-drying coating, a preparation method and a film forming method thereof, belonging to the technical field of coatings.
Background
The coating plays an increasingly important role in the life of people and becomes an indispensable material for the development of modern society. Most of the existing coatings adopt toxic and harmful organic matters as solvents and auxiliaries in the coating preparation process, a large amount of VOC (volatile organic compounds) enters air in the using process, and according to statistics, the amount of VOC harmful gas discharged by the solvent coatings is about 400 ten thousand tons every year, so that the VOC harmful gas harms the health of people and pollutes the ecological environment. With the advent of environmental protection policies and the enhancement of environmental protection awareness, organic solvent-based coatings have been largely replaced by water-based coatings.
The baking type coating is one kind of coating, and is widely applied to object surfaces with higher requirements on protection and decoration at present. The traditional baking type coating is mainly solvent type coating and has serious environmental pollution, so the water-based baking type coating is a research hotspot in the baking type coating industry at present.
Although the water-based paint can avoid the harm caused by an organic solvent, the water-based paint takes water as a solvent, so that the drying speed is slow, generally speaking, the drying speed can be accelerated by increasing the drying temperature, the baking-type paint usually needs to be baked at a high temperature of more than 120 ℃ when in use, if the water-based baking-type paint takes water as a solvent, the excessive temperature inevitably causes the defects of more coating film surfaces, causes certain influence on the corrosion resistance and the aesthetic property of the coating film, and seriously influences the use of the coating film, which is also a main reason that the current water-based baking-type paint cannot completely replace a solvent-based baking-type paint.
The paint industry has a sentence commonly called three-part paint seven-part construction, which explains the importance of paint construction, and the paint can show rich and colorful decorative performance and protective performances such as corrosion resistance, antifouling performance, mildew resistance and the like only after practical application, and generally, in the construction process of the paint, the quality of a film formed by the paint determines the construction quality. The existing water paint, especially the water baking paint, is usually directly baked or dried at high temperature to form a film as soon as possible when the paint is applied to form a film, but if the film forming method is improper, the film forming quality of the paint is poor, and the application of the paint is influenced.
Disclosure of Invention
In view of the above problems in the prior art, the present invention aims to provide an environment-friendly high-temperature-bakeable organic-inorganic water-based quick-drying paint, a preparation method and a film forming method thereof.
In order to achieve the purpose, the invention adopts the following technical scheme:
an organic-inorganic water-based quick-drying paint comprises the following components in percentage by weight:
coupling agent A: 16.5-23.5 wt%;
a coupling agent B: 16.5-23.5 wt%;
nano aluminum sol: 15.5-23.5 wt%;
pigment and filler: 17.5-23.5 wt%;
anti-settling agent: 0.2-2 wt%;
wetting and dispersing agent: 0.5-2.5 wt%;
an anti-sticking agent: 0.5-2 wt%;
leveling agent: 0.5-2 wt%;
deionized water: 15 to 19 wt%.
In one embodiment, the coupling agent A and the coupling agent B are both organosilane coupling agents, the coupling agent A is preferably gamma-aminopropyltriethoxysilane or gamma- (2, 3-glycidoxy) propyltrimethoxysilane, and the coupling agent B is preferably methyltrimethoxysilane.
As an embodiment, the nano aluminum sol is a nano aluminum sol with the pH of 4-6 and the particle size of 1-100 nm, and is preferably a semitransparent nano aluminum sol prepared by an aluminum alkoxide method, with the pH of 4-6 and the particle size of 40-60 nm.
In one embodiment, the pigment and filler is rutile titanium dioxide.
In one embodiment, the anti-settling agent is selected from any one of attapulgite gel powder (specifically, inert attapulgite gel powder), organobentonite, or fumed silica.
As an embodiment, the wetting dispersant is a non-ionic wetting dispersant, preferably a polyoxyethylene ether type wetting dispersant or a polypropylene glycol, such as: alkylphenol ethoxylates, lauryl alcohol ethoxylates, and the like.
In one embodiment, the anti-sticking agent is an organosilicon anti-sticking agent, preferably an amino polyether organosilicon or a composite emulsion of a high molecular nano organosilicon wax and a fatty acid (the mass ratio of the high molecular nano organosilicon wax to the fatty acid is 8: 2-7: 3, for example, SviK-5H bright type organosilicon anti-sticking agent of St.Vitaceae printing materials, Inc. of Heizhou).
As an embodiment, the leveling agent is a polysiloxane leveling agent, preferably a polydimethylsiloxane or fluoropolyether modified polysiloxane leveling agent.
A method for preparing the organic-inorganic water-based quick-drying coating, which comprises the following steps:
a) adding the coupling agent A and the nano-alumina sol into the coupling agent B in proportion, and stirring and mixing uniformly to obtain a component A;
b) adding the wetting dispersant in proportion into deionized water, and stirring and mixing uniformly; then adding the pigment filler with the proportion amount, and stirring and mixing uniformly; then adding the anti-settling agent in a proportion amount, and stirring and mixing uniformly to obtain a component B;
c) stirring and mixing the component A and the component B uniformly; and adding the leveling agent and the anti-sticking agent in a ratio, stirring and mixing uniformly, filtering and discharging to obtain the organic-inorganic water-based quick-drying coating.
Preferably, in the step a), the stirring and mixing temperature is less than or equal to 60 ℃, and preferably 40-60 ℃.
A film forming method of an organic-inorganic water-based quick-drying coating is characterized in that the coating is dried to form a film by adopting a mixed drying mode of baking at 120-140 ℃ for 40-50 seconds and electromagnetic heating at 90-150w power for 7-15 seconds after being coated on a base material.
As a preferred method, the film forming method includes the operations of:
1) coating the prepared coating on a substrate by using a roller coating mode, wherein the thickness of a wet film is controlled to be 100 +/-10 mu m;
2) placing the base material coated with the coating in an oven at 120-140 ℃ for baking for 40-50 seconds to dry the coating;
3) and transferring the base material to an electromagnetic heater, adjusting the power to 90-150w, and heating for 7-15 seconds to finish film formation of the coating.
The base material is preferably a tinplate or a coiled steel plate.
Compared with the prior art, the invention has the following remarkable beneficial effects:
according to the invention, water is used as a dispersing medium, aluminum sol and a coupling agent are used as main film forming substances, and under the synergistic effect of various components (including wetting dispersant, leveling agent and other auxiliaries), the coating disclosed by the invention is green and environment-friendly, has no solvent pollution, has better gloss and scrubbing resistance, can be naturally cured to form a film at normal temperature, has excellent quick drying property, can still maintain better appearance and anticorrosion capability particularly under the baking of 120-140 ℃, can be used as a baking type coating, has a wide application prospect, and has remarkable progress and unexpected effects; in addition, the preparation process is economical and practical, the preparation process is simple, the cost is low, special equipment and harsh conditions are not needed, large-scale production is easy to realize, and the preparation method has high practical value.
Detailed Description
The technical scheme of the invention is further detailed and completely explained by combining the embodiment.
Example 1
The organic-inorganic water-based quick-drying coating comprises the following components in percentage by weight:
coupling agent A: 18 wt%;
a coupling agent B: 18 wt%;
nano aluminum sol: 15.5 wt%;
pigment and filler: 23 wt%;
anti-settling agent: 2 wt%;
wetting and dispersing agent: 0.5 wt%;
an anti-sticking agent: 2 wt%;
leveling agent: 2 wt%;
deionized water: 19 wt%.
II) preparing an organic-inorganic water-based quick-drying coating:
a) adding the coupling agent B and the nano-alumina sol in the proportion into the coupling agent A, controlling the stirring speed to be 500 r/min, controlling the stirring and mixing temperature to be 40 ℃, and uniformly stirring and mixing to obtain a component A;
b) adding the wetting dispersant in proportion into deionized water, controlling the stirring speed to be 300 r/min, and stirring for 10 min to uniformly mix; then adding the pigment filler with the proportion amount, controlling the stirring speed to be 1000 r/min, and stirring for 60 min to uniformly mix; then adding the anti-settling agent with the proportion amount, controlling the stirring speed to be 500 revolutions per minute, and stirring for 20 minutes to uniformly mix the components to obtain a component B;
c) controlling the stirring speed to be 500 r/min, and stirring and mixing the component A and the component B uniformly; adding the leveling agent and the anti-sticking agent in a ratio, controlling the stirring speed to be 500 revolutions per minute, stirring for 90 minutes to uniformly mix, filtering and discharging to obtain the organic-inorganic water-based quick-drying coating.
Thirdly), the film forming method of the organic-inorganic water-based quick-drying coating comprises the following steps:
1) coating the prepared coating on a tinplate or a coiled steel plate by using a roller coating mode, wherein the thickness of a wet film is controlled to be 100 +/-10 mu m;
2) placing the plate in an oven at 140 ℃ for baking for 40 seconds, and then basically drying the film by touch;
3) and transferring the plate onto an electromagnetic heater, adjusting the power to 150w, taking out the sample plate after 7 seconds, and finishing film formation by the coating.
In the embodiment, the coupling agent A is gamma-aminopropyltriethoxysilane, and the coupling agent B is methyltrimethoxysilane; the nano aluminum sol is semitransparent nano aluminum sol prepared by an aluminum alkoxide method, the pH value is 4-6, and the particle size is 45-55 nm; the pigment and filler is rutile type titanium dioxide; the anti-settling agent is inert attapulgite gel powder; the wetting dispersant is alkylphenol polyoxyethylene; the anti-sticking agent is amino polyether organic silicon anti-sticking agent; the leveling agent is polydimethylsiloxane.
Example 2
The organic-inorganic water-based quick-drying coating comprises the following components in percentage by weight:
coupling agent A: 20 wt%;
a coupling agent B: 17.5 wt%;
nano aluminum sol: 17.5 wt%;
pigment and filler: 23 wt%;
anti-settling agent: 1 wt%;
wetting and dispersing agent: 1.5 wt%;
an anti-sticking agent: 1.5 wt%;
leveling agent: 1 wt%;
deionized water: 17 wt%.
II) preparing an organic-inorganic water-based quick-drying coating:
a) adding the coupling agent B and the nano-alumina sol in the proportion into the coupling agent A, controlling the stirring speed to be 500 r/min, controlling the stirring and mixing temperature to be 50 ℃, and uniformly stirring and mixing to obtain a component A;
b) adding the wetting dispersant in proportion into deionized water, controlling the stirring speed to be 300 r/min, and stirring for 20 min to uniformly mix; then adding the pigment filler with the proportion amount, controlling the stirring speed to be 1000 r/min, and stirring for 90 min to uniformly mix; then adding the anti-settling agent with the proportion amount, controlling the stirring speed to be 500 revolutions per minute, and stirring for 40 minutes to uniformly mix the components to obtain a component B;
c) controlling the stirring speed to be 500 r/min, and stirring and mixing the component A and the component B uniformly; adding the leveling agent and the anti-sticking agent in a ratio, controlling the stirring speed to be 500 revolutions per minute, stirring for 60 minutes to uniformly mix, filtering and discharging to obtain the organic-inorganic water-based quick-drying coating.
Thirdly), the film forming method of the organic-inorganic water-based quick-drying coating comprises the following steps:
1) coating the prepared coating on a tinplate or a coiled steel plate by using a roller coating mode, wherein the thickness of a wet film is controlled to be 100 +/-10 mu m;
2) placing the plate in an oven at 130 ℃ for baking for 45 seconds, and then basically drying the coating film by touch;
3) and transferring the plate onto an electromagnetic heater, adjusting the power to be 100w, taking out the sample plate after 12 seconds, and finishing film formation by the coating.
In the embodiment, the coupling agent A is gamma- (2, 3-epoxypropoxy) propyl trimethoxy silane, and the coupling agent B is methyl trimethoxy silane; the nano aluminum sol is semitransparent nano aluminum sol prepared by an aluminum alkoxide method and has the pH value of 4-6, the pH value of 4-6 and the particle size of 50-60 nm; the pigment and filler is rutile type titanium dioxide; the anti-settling agent is organic bentonite powder; the wetting dispersant is polyoxyethylene lauryl ether; the anti-sticking agent is SviK-5H bright type organic silicon anti-sticking agent; the leveling agent is polysiloxane modified by fluorine-based polyether.
Example 3
The organic-inorganic water-based quick-drying coating comprises the following components in percentage by weight:
coupling agent A: 19.7 wt%;
a coupling agent B: 19.7 wt%;
nano aluminum sol: 19.7 wt%;
pigment and filler: 19.7 wt%;
anti-settling agent: 0.5 wt%;
wetting and dispersing agent: 1 wt%;
an anti-sticking agent: 1 wt%;
leveling agent: 1 wt%;
deionized water: 17.7 wt%.
II) preparing an organic-inorganic water-based quick-drying coating:
a) adding the coupling agent A and the nano-alumina sol in the proportion into the coupling agent B, controlling the stirring speed to be 500 r/min, controlling the stirring and mixing temperature to be 60 ℃, and uniformly stirring and mixing to obtain a component A;
b) adding the wetting dispersant in proportion into deionized water, controlling the stirring speed at 500 r/min, and stirring for 10 min to uniformly mix; then adding the pigment filler with the proportion amount, controlling the stirring speed to be 1000 r/min, and stirring for 80 min to uniformly mix; then adding the anti-settling agent with the proportion amount, controlling the stirring speed to be 500 revolutions per minute, and stirring for 30 minutes to uniformly mix the components to obtain a component B;
c) controlling the stirring speed to be 500 r/min, and stirring and mixing the component A and the component B uniformly; adding the leveling agent and the anti-sticking agent in a ratio, controlling the stirring speed to be 500 revolutions per minute, stirring for 50 minutes to uniformly mix, filtering and discharging to obtain the organic-inorganic water-based quick-drying coating.
Thirdly), the film forming method of the organic-inorganic water-based quick-drying coating comprises the following steps:
1) coating the prepared coating on a tinplate or a coiled steel plate by using a roller coating mode, wherein the thickness of a wet film is controlled to be 100 +/-10 mu m;
2) placing the plate in an oven at 120 ℃ for baking for 50 seconds, and then basically drying the film by touch;
3) and transferring the plate onto an electromagnetic heater, adjusting the power to 90w, taking out the sample plate after 15 seconds, and finishing film formation by the coating.
In the embodiment, the coupling agent A is gamma-aminopropyltriethoxysilane, and the coupling agent B is methyltrimethoxysilane; the nano aluminum sol is semitransparent nano aluminum sol prepared by an aluminum alkoxide method and has the pH value of 4-6, the pH value of 4-6 and the particle size of 40-50 nm; the pigment and filler is rutile type titanium dioxide; the anti-settling agent is fumed silica; the wetting dispersant is polypropylene glycol; the anti-sticking agent is SviK-5H bright type organic silicon anti-sticking agent; the leveling agent is polydimethylsiloxane.
Comparative example 1
Firstly), the composition and the mixture ratio of the organic-inorganic water-based quick-drying coating are as in example 1;
two) preparation of organic-inorganic waterborne quick-drying coatings as in example 1;
thirdly), the film forming method of the organic-inorganic water-based quick-drying coating comprises the following steps:
1) coating the prepared coating on a tinplate or a coiled steel plate by using a roller coating mode, wherein the thickness of a wet film is controlled to be 100 +/-10 mu m;
2) and (3) placing the plate in an oven at 160 ℃ for baking for 5 minutes, taking out the sample plate, and finishing film formation by the coating.
The coatings after film formation of the examples and comparative examples 1 were subjected to performance tests, and the specific test results are shown in table 1.
The embodiment and the comparative example show that the coating prepared by the invention can be formed into a film in about one minute in a mixed drying mode of high-temperature baking at 120-140 ℃ and electromagnetic heating at 90-150w, and can be formed into a film in only 5 minutes at 160 ℃ when dried by an oven, which shows that the coating provided by the invention has excellent quick drying property and can be used as a baking type coating.
TABLE 1 Performance test data for organic-inorganic waterborne quick-drying coatings of examples and comparative examples
| Detecting items | Detection standards and methods | Example 1 | Example 2 | Example 3 | Comparative example 1 |
| Impact performance | GB/T 1732 | Qualified | Qualified | Qualified | Qualified |
| Resistance to brushing | GB/T 9266-2009 | Greater than 3000 | Greater than 3000 | Greater than 3000 | Greater than 3000 |
| Adhesion (pulling open method) | GB/T 5210-2006 | 2.15MPa | 1.78MPa | 1.51MPa | 1.43MPa |
| Hardness of coating | GB/T 6739 | 3H | 2H | 2H | 2H |
| Glossiness (60 degree) | GB/T 9754 | 85.7 | 84.3 | 82.3 | 82.7 |
| Water resistance | GB/T 1733-93 | Qualified | Qualified | Qualified | Qualified |
| Resistance to butanone | HG/T3830-2006 | >50 times | >50 times | >50 times | >50 times |
| Drying time | GB/T 1728 | 65 seconds | 115 seconds | 135 seconds | 240 seconds |
As can be seen from table 1, the organic-inorganic water-based quick-drying coating provided by the invention has excellent quick-drying property, and still has excellent impact property, brushing resistance, adhesive force, coating hardness, appearance (glossiness) and anticorrosion capability (water resistance and butanone resistance) under high-temperature baking at 120-140 ℃, and all physical indexes of the coating accord with national relevant standards, so that the coating can be used as a baking coating; particularly, compared with the traditional single film forming mode of high-temperature drying, the drying film forming mode of high-temperature baking and electromagnetic heating provided by the invention has more excellent performances after the film forming of the coating, and the coating film forming process has remarkable progress compared with the traditional film forming process.
Finally, it should be pointed out here that: the above is only a part of the preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention, and the insubstantial modifications and adaptations of the present invention by those skilled in the art based on the above description are intended to be covered by the present invention.
Claims (4)
1. An organic-inorganic water-based quick-drying paint for coiled steel plates is characterized by comprising the following components in percentage by weight:
coupling agent A: 16.5-23.5 wt%;
a coupling agent B: 16.5-23.5 wt%;
nano aluminum sol: 15.5-23.5 wt%;
pigment and filler: 17.5-23.5 wt%;
anti-settling agent: 0.2-2 wt%;
wetting and dispersing agent: 0.5-2.5 wt%;
an anti-sticking agent: 0.5-2 wt%;
leveling agent: 0.5-2 wt%;
deionized water: 15 to 19 wt%;
the coupling agent A is gamma-aminopropyltriethoxysilane or gamma- (2, 3-epoxypropoxy) propyltrimethoxysilane, and the coupling agent B is methyltrimethoxysilane; the pigment and filler is rutile titanium dioxide; the anti-settling agent is any one of attapulgite gel powder, organic bentonite or fumed silica; the wetting dispersant is a non-ionic wetting dispersant; the anti-sticking agent is an organic silicon anti-sticking agent; the leveling agent is polysiloxane leveling agent.
2. The organic-inorganic aqueous quick-drying coating according to claim 1, characterized in that: the nano aluminum sol is pH 4-6 and has a particle size of 1-100 nm.
3. A method of preparing the organic-inorganic aqueous quick-drying coating of claim 1, comprising the steps of:
a) adding the coupling agent A and the nano-alumina sol into the coupling agent B in proportion, and stirring and mixing uniformly to obtain a component A;
b) adding the wetting dispersant in proportion into deionized water, and stirring and mixing uniformly; then adding the pigment filler with the proportion amount, and stirring and mixing uniformly; then adding the anti-settling agent in a proportion amount, and stirring and mixing uniformly to obtain a component B;
c) stirring and mixing the component A and the component B uniformly; and adding the leveling agent and the anti-sticking agent in a ratio, stirring and mixing uniformly, filtering and discharging to obtain the organic-inorganic water-based quick-drying coating.
4. A method for forming a film of the organic-inorganic aqueous quick-drying paint according to claim 1, characterized in that: after the coating is coated on a coiled steel plate, the coiled steel plate is dried to form a film by adopting a mixed drying mode of baking at 120-140 ℃ for 40-50 seconds and electromagnetically heating at 90-150w power for 7-15 seconds.
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| CN106398333A (en) * | 2016-09-10 | 2017-02-15 | 上海大学 | Preparation method of nano sol hybrid polysiloxane magnesium alloy surface preservative |
| CN109251660A (en) * | 2018-09-21 | 2019-01-22 | 青岛理工大学 | A kind of alumina sol-silane composite material and preparation method and application |
| CN109294296A (en) * | 2018-09-27 | 2019-02-01 | 湖南松井新材料股份有限公司 | Aqueous one-component vitreous enamel coating of super resistant and preparation method thereof and construction technology |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106398333A (en) * | 2016-09-10 | 2017-02-15 | 上海大学 | Preparation method of nano sol hybrid polysiloxane magnesium alloy surface preservative |
| CN109251660A (en) * | 2018-09-21 | 2019-01-22 | 青岛理工大学 | A kind of alumina sol-silane composite material and preparation method and application |
| CN109294296A (en) * | 2018-09-27 | 2019-02-01 | 湖南松井新材料股份有限公司 | Aqueous one-component vitreous enamel coating of super resistant and preparation method thereof and construction technology |
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