CN113072867A - Water-based polyurethane structural color waterproof coating and preparation method and application thereof - Google Patents
Water-based polyurethane structural color waterproof coating and preparation method and application thereof Download PDFInfo
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Abstract
The invention provides a water-based polyurethane structural color waterproof coating, a preparation method and an application thereof, wherein the water-based polyurethane structural color waterproof coating comprises the following components: the high-strength water-based polyurethane coating is characterized by comprising monodisperse submicron microspheres, carbon black and water-based polyurethane emulsion, wherein the monodisperse submicron microspheres and the water-based polyurethane emulsion are compounded, and then the carbon black is added to inhibit scattering of a white background, so that the high-strength water-based polyurethane coating with the structural color without angle dependence is obtained. The coating disclosed by the invention is simple in preparation process, low in cost and environment-friendly; the coating can be used as a waterproof heavy-metal-free colored environment-friendly water-based coating, is easy to coat, strong in adhesive force, high in strength, corrosion-resistant and wide in applicability, and has important application value and wide application prospect in the water-based polyurethane industry.
Description
Technical Field
The invention relates to a water-based polyurethane structural color waterproof coating and a preparation method and application thereof, belonging to the field of structural colors.
Background
With the development of society and the gradual deterioration of environment, VOC-containing coatings are gradually being eliminated by the market and replaced by aqueous coatings. The waterborne polyurethane has the characteristics of good toughness, high temperature resistance, low temperature resistance and excellent ultraviolet resistance, does not have the defects of easy volatilization, flammability, explosiveness, toxicity and the like, and is a film forming substance for coating application at present.
The traditional paint has two main pollutants: volatile organic compounds (such as toluene and formaldehyde) and heavy metal pigment substances (such as cadmium yellow PbCrO)4). Although the industrial technology which is now industrialized can realize the production of completely aqueous indoor coatings (such as aqueous epoxy, aqueous polyurethane and the like), no good substitute for heavy metal pigment substances exists, and the substitute is usually organic dye, but has higher toxicity.
Compared with pigment color, the structural color has the advantages of high brightness, high saturation, no fading and the like. Structural color generation results from the interaction of visible light with the micro-nano structure of the substance, such as scattering, interference or diffraction. At present, in the research of artificially constructing structural colors, the structural colors are mainly realized by photonic crystals and amorphous photonic structures. The realization of structural color building by photonic crystal structures is the most common way to produce brilliant structural colors (see patents CN 200710064245.0; x.wang, z.wang, l.bai, h.wang, l.kang, d.h.werner, m.xu, b.li, j.li and x. -f.yu, opt.express,2018,26,27001-. And the structural color without angle dependence can be realized by an amorphous photon structure with the characteristic size of the visible light wavelength order, and the microstructure units of the amorphous photon structure are in short-range ordered and long-range disordered arrangement (see W.Yuan, N.ZHou, L.ShiandK. -Q.Zhang, ACSApplied materials & Interfaces,2015,7, 14064-. Due to the structural disorder, scattered light can be scattered in all directions in the whole space, and the short-range order can lead the scattered light to generate coherent superposition, so that structural color without angle dependence can be generated.
Patent CN110079171A discloses a structural color paint based on Mie scattering of high-refractive-index microspheres, and the prepared paint has a bright structural color, but the preparation process is complex, and the waterproof performance of the paint is not outstanding enough due to the nature of the used binder and the nano microspheres.
Therefore, the construction of a colored environment-friendly coating without heavy metal substances has important application value for polymer coatings, pigments, paints and industries based on the applications.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide the structural color coating which is easy to repeatedly prepare, has continuously adjustable physical structural color, wide application range and low production cost and realizes high-strength water resistance, and the preparation method and the application thereof.
In order to achieve the purpose, the invention adopts the technical scheme that: a water-based polyurethane structural color waterproof coating comprises the following components: monodisperse submicron microspheres, carbon black and aqueous polyurethane emulsion;
the mass ratio of the monodisperse submicron microsphere to the carbon black to the aqueous polyurethane emulsion is as follows: carbon black: aqueous polyurethane emulsion 1: 0.01-0.05: 1-5;
the average diameter of the monodisperse submicron microsphere is 100-400 nm;
the monodisperse submicron microsphere is one of silicon dioxide, titanium dioxide, polystyrene, polyacrylate and polymethacrylate.
The amount of carbon black added is critical to the color contrast of the coatings produced from the structural color coatings. When the content of the carbon black is too low, too little carbon black is not enough to absorb incoherent light in the photonic crystal, so that the interference of the incoherent light on the color is reduced, and the color contrast of the structural color coating is not greatly improved. When the content of the carbon black is too high, the black substance is too much, and the structural color coating becomes dark and black, so that the color attractiveness of the structural color coating is influenced; and the fluidity of the structural color coating can be influenced, the structural color coating prepared from the structural color coating becomes hard, and the practicability of the structural color coating is influenced.
The structural color of the high-strength water-based polyurethane structural color waterproof coating prepared by the invention is mainly controlled by the particle size of the microspheres, and microsphere systems with different structural colors can be obtained by selecting the microspheres with different particle sizes. The silicon dioxide, the titanium dioxide, the polystyrene, the polyacrylate and the polymethacrylate are spontaneously assembled into an ordered structure due to the library force among the silicon dioxide, the titanium dioxide, the polystyrene, the polyacrylate and the polymethacrylate, and are compounded with the waterborne polyurethane, and the high viscosity of the waterborne polyurethane can destroy the stacking order degree of the monodisperse submicron-grade microspheres, so that the angle-independent physical structural color is generated.
As a preferred embodiment of the water-based polyurethane structural color waterproof coating, the mass ratio of the monodisperse submicron microsphere, the carbon black and the water-based polyurethane emulsion is that the monodisperse submicron microsphere is: carbon black: aqueous polyurethane emulsion 1: 0.01-0.03: 2 to 4.
According to the proportion, the structural color, the strength and the waterproof performance of the waterborne polyurethane structural color waterproof coating are good.
As a preferred embodiment of the water-based polyurethane structural color waterproof coating, the mass ratio of the monodisperse submicron microsphere, the carbon black and the water-based polyurethane emulsion is that the monodisperse submicron microsphere is: carbon black: aqueous polyurethane emulsion 1: 0.01: 3.
according to the proportion, the structural color, the strength and the waterproof performance of the waterborne polyurethane structural color waterproof coating are optimal.
As a preferred embodiment of the water-based polyurethane structural color waterproof coating material of the present invention, the mass ratio of the water-based polyurethane to the solvent in the polyurethane emulsion is water-based polyurethane: the solvent is 1: 1-5.
The solvent is water, and the high viscosity of the waterborne polyurethane can destroy the stacking order of the monodisperse submicron microspheres, so that the angle-independent physical structural color is generated. The mass ratio of the aqueous polyurethane to the solvent can influence the viscosity of the polyurethane emulsion, the viscosity is too low to play a role in destroying the degree of order of the accumulation of the monodisperse submicron microspheres, and the physical structural color without angle dependence cannot be obtained; the viscosity is too high, the flowability of the structural color coating is too poor, and the practicability of the structural color coating is influenced.
In a preferred embodiment of the water-based polyurethane structural color waterproof coating material of the present invention, the water-based polyurethane is one of anionic, cationic and nonionic.
In a second aspect, the invention also provides a preparation method of the water-based polyurethane structural color waterproof coating, which is characterized by comprising the following steps: adding the monodisperse submicron microspheres into the polyurethane emulsion, adding carbon black, and uniformly stirring to obtain the water-based polyurethane structural color waterproof coating.
In a third aspect, the invention also provides a method for preparing a coating by using the water-based polyurethane structural color waterproof paint, which is characterized by comprising the following steps: wiping the substrate clean and drying, then transferring the coating to the surface of the substrate in a spraying, blade coating, brush coating, roller coating or dip coating mode, and drying to obtain the coating with the short-range ordered long-range disordered structure.
As a preferred embodiment of a method for preparing a coating layer using the water-based polyurethane structural color waterproof paint, characterized in that the substrate is glass, metal, textile, ceramic, plastic or paper.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention provides a high-strength water-based polyurethane structural color waterproof coating, and a preparation method and application thereof.
2. Different structural color characteristics are obtained by preparing microspheres with different particle sizes, and the structural color of the composite material is continuously regulated and controlled according to actual requirements.
3. The method for preparing the high-strength water-based polyurethane structural color waterproof coating is simple and convenient to operate, the used raw materials are cheap and easy to obtain, expensive instruments are not needed, the cost is low, the method is suitable for industrial preparation, is suitable for multiple purposes, has good actual popularization and application values, and has important application values and wide application prospects in the polymer coating industry.
Drawings
FIG. 1 is a scanning electron micrograph of the plane of the red structural color coating obtained in example 1;
FIG. 2 is a scanning electron micrograph of a cross section of a red structural color coating obtained in example 1;
FIG. 3 shows the reflectance spectra of the structural color coatings obtained in examples 1, 2 and 3, which are shown in the following order from top to bottom in example 2, example 1 and example 3;
FIG. 4 is a stress-strain curve of the water-based polyurethane structural color paint and the pure water-based polyurethane paint in example 1, wherein the water-based polyurethane structural color paint and the pure water-based polyurethane paint in example 1 are sequentially arranged from top to bottom;
FIG. 5 is a picture of the white coating obtained in comparative example 1;
FIG. 6 is a graph of the black coating obtained in comparative example 2.
Detailed Description
To better illustrate the objects, aspects and advantages of the present invention, the present invention will be further described with reference to the accompanying drawings and specific examples.
Reagents, methods and apparatus used in the present invention are conventional in the art unless otherwise indicated.
Unless otherwise indicated, reagents and materials used in the following examples are commercially available.
Example 1
1. Dispersing 0.35 weight part of methacrylic acid and 15 weight parts of styrene in deionized water; heating and stirring to 78 ℃, and then adding 0.2 part by weight of ammonium persulfate; the mixture was stirred overnight at 78 ℃. After a crude product is obtained, purifying the crude product to obtain a product; and centrifugally concentrating to obtain the submicron polystyrene microspheres with the average particle size of 210 nm.
2. A water-based polyurethane structural color waterproof coating comprises the following components: 210nm polystyrene microspheres, carbon black and aqueous polyurethane emulsion, wherein the mass ratio of the 210nm polystyrene microspheres to the carbon black to the aqueous polyurethane emulsion is 210nm polystyrene microspheres: carbon black: aqueous polyurethane emulsion 1: 0.01: 3; the mass ratio of the aqueous polyurethane to the water in the aqueous polyurethane emulsion is 1: 3.
And mixing the 210nm polystyrene microspheres with the anionic waterborne polyurethane emulsion, adding carbon powder, mechanically stirring uniformly, and fully dispersing to obtain the high-strength waterborne polyurethane structural color waterproof coating.
3. And wiping the glass substrate clean and drying, spraying the prepared coating on the surface of the glass, and drying at room temperature to obtain the coating with local micro-ordered and macro long-range disordered structure. A uniform red structural color film was formed on the glass surface.
4. And (3) performing scanning electron microscope characterization on the obtained coating, wherein the structural color coating forms a local short-range ordered and macroscopic long-range disordered structure after being sprayed on the surface of the glass, as shown in a plane electron microscope in fig. 1 and a section electron microscope in fig. 2. As shown in the reflection spectrum of fig. 3, it can be seen that the obtained structural color film has a distinct reflection peak at 650 nm, i.e., can display a bright red structural color.
Example 2
1. Dispersing 0.35 weight part of methacrylic acid and 10 weight parts of styrene in deionized water; heating and stirring to 78 ℃, and then adding 0.2 part by weight of ammonium persulfate; the mixture was stirred overnight at 78 ℃. After a crude product is obtained, purifying the crude product to obtain a product; the polystyrene microspheres are centrifugally concentrated to obtain submicron polystyrene microspheres with the average particle size of 180 nm.
2. A water-based polyurethane structural color waterproof coating comprises the following components: the weight ratio of the 180nm polystyrene microsphere to the carbon black to the aqueous polyurethane emulsion is 180nm polystyrene microsphere: carbon black: aqueous polyurethane emulsion 1: 0.01: 3; the mass ratio of the aqueous polyurethane to the water in the aqueous polyurethane emulsion is 1: 3.
And (3) mixing the 180nm polystyrene microspheres with the non-ionic aqueous polyurethane emulsion, adding carbon powder, mechanically stirring uniformly, and fully dispersing to obtain the high-strength aqueous polyurethane structural color waterproof coating.
3. And wiping the glass substrate clean and drying, spraying the prepared coating on the surface of the glass, and drying at room temperature to obtain the coating with local micro-ordered and macro long-range disordered structure. A uniform green structural color film was formed on the glass surface.
4. And (3) performing scanning electron microscope characterization on the obtained coating, wherein the structural color coating forms a local microcosmic ordered and macroscopic long-range disordered structure after being sprayed on the surface of the glass. As shown in the reflection spectrum of fig. 3, it can be seen that the obtained structural color film has a distinct reflection peak at 545 nm, i.e. can display a bright green structural color.
Example 3
1. Dispersing 0.35 weight part of methacrylic acid, 15 weight parts of styrene and 0.025 weight part of sodium dodecyl sulfate in deionized water; heating and stirring to 78 ℃, and then adding 0.2 part by weight of ammonium persulfate; the mixture was stirred overnight at 78 ℃. After a crude product is obtained, purifying the crude product to obtain a product; and centrifugally concentrating to obtain the submicron polystyrene microspheres with the average particle size of 130 nm.
2. A water-based polyurethane structural color waterproof coating comprises the following components: 130nm polystyrene microspheres, carbon black and aqueous polyurethane emulsion, wherein the mass ratio of the 130nm polystyrene microspheres to the carbon black to the aqueous polyurethane emulsion is 130nm polystyrene microspheres: carbon black: aqueous polyurethane emulsion 1: 0.01: 3; the mass ratio of the aqueous polyurethane to the water in the aqueous polyurethane emulsion is 1: 3.
And (3) mixing the 130nm polystyrene microspheres with the non-ionic waterborne polyurethane emulsion, adding carbon powder, mechanically stirring uniformly, and fully dispersing to obtain the high-strength waterborne polyurethane structural color waterproof coating.
3. And wiping the metal plate substrate clean and drying, then spraying the prepared coating on the surface of the metal plate, and drying at room temperature to obtain the coating with local micro-ordered and macro long-range disordered structure. A uniform blue structural color film is formed on the surface of the metal plate.
4. And (3) performing scanning electron microscope characterization on the obtained coating, wherein the structural color coating forms a local microcosmic ordered and macroscopic long-range disordered structure after being sprayed on the surface of the glass. As shown in the reflection spectrum of fig. 3, it can be seen that the obtained structural color film has a distinct reflection peak at 465 nm, i.e. a bright blue structural color can be displayed.
Example 4
1. Mixing 150 parts by volume of absolute ethyl alcohol, 4 parts by volume of water and 12 parts by volume of ammonia water (25%), and carrying out ultrasonic oscillation for 15min to obtain solution A; dissolving 3 parts by volume of hexyl orthosilicate (TEOS) in 50 parts by volume of absolute ethyl alcohol, and carrying out ultrasonic oscillation for 25min to obtain solution B. And stirring the solution A at a constant temperature for 10min, slowly pouring the solution B, reacting for 12 hours until the solution is turbid, collecting, filtering and washing the collected solution to obtain filter residues, and drying the filter residues in a vacuum drying oven at 100 ℃ for more than 2 hours to obtain silicon dioxide with the particle size of 100 nm.
2. A water-based polyurethane structural color waterproof coating comprises the following components: the composite material comprises 100nm silicon dioxide microspheres, carbon black and aqueous polyurethane emulsion, wherein the mass ratio of the 100nm silicon dioxide microspheres to the carbon black to the aqueous polyurethane emulsion is 100nm silicon dioxide microspheres: carbon black: aqueous polyurethane emulsion 1: 0.02: 2; the mass ratio of the aqueous polyurethane to the water in the aqueous polyurethane emulsion is 1: 1.
And mixing the 100nm silicon dioxide microspheres with the cationic waterborne polyurethane emulsion, adding carbon powder, mechanically stirring uniformly, and fully dispersing to obtain the high-strength waterborne polyurethane structural color waterproof coating.
3. And wiping the textile substrate clean and drying, then dip-coating the prepared coating on the textile surface, and drying at room temperature to obtain the coating with local micro-ordered and macro long-range disordered structure. And forming a uniform purple structural color film on the surface of the textile.
Example 5
1. Mixing titanium sulfate (Ti (SO)4)2) Dissolving in distilled water, dissolving for 1 hr, filtering to remove insoluble substances to obtain 0.2 mol/L-1Will obtain Ti(SO4)2The solution was mixed with n-propanol in a ratio of 1:1 (by volume) and then 5g by L-1Adding polyvinylpyrrolidone K30, stirring to dissolve completely, heating and hydrolyzing the mixed solution in water bath at 70-90 deg.C for 100 min, cooling, centrifuging to remove supernatant, washing the obtained precipitate with distilled water to pH of about 7, drying and grinding at 90 deg.C, and treating at 750 deg.C for 4 hr to obtain TiO with particle size of 300nm2And (3) microspheres.
2. A water-based polyurethane structural color waterproof coating comprises the following components: the composite material comprises 300nm titanium dioxide microspheres, carbon black and aqueous polyurethane emulsion, wherein the mass ratio of the 300nm titanium dioxide microspheres to the carbon black to the aqueous polyurethane emulsion is 300nm titanium dioxide microspheres: carbon black: aqueous polyurethane emulsion 1: 0.03: 4; the mass ratio of the aqueous polyurethane to the water in the aqueous polyurethane emulsion is 1: 5.
And mixing the titanium dioxide microspheres with the diameter of 300nm with the anionic waterborne polyurethane emulsion, adding carbon powder, mechanically stirring uniformly, and fully dispersing to obtain the high-strength waterborne polyurethane structural color waterproof coating.
3. Wiping the ceramic substrate clean and drying, then coating the prepared coating on the surface of the ceramic by blade, and drying at room temperature to obtain the coating with local micro-ordered and macro long-range disordered structure. A uniform orange structural color film is formed on the surface of the ceramic.
Example 6
1. Dispersing 0.35 weight part of methacrylic acid and 25 weight parts of styrene in deionized water; heating and stirring to 78 ℃, and then adding 0.2 part by weight of ammonium persulfate; the mixture was stirred overnight at 78 ℃. After a crude product is obtained, purifying the crude product to obtain a product; and centrifugally concentrating to obtain the polyacrylate microspheres with the average particle size of 400 nm.
2. A water-based polyurethane structural color waterproof coating comprises the following components: the weight ratio of the 400nm polyacrylate microspheres to the carbon black to the aqueous polyurethane emulsion is 400nm polyacrylate microspheres: carbon black: aqueous polyurethane emulsion 1: 0.05: 5; the mass ratio of the aqueous polyurethane to the water in the aqueous polyurethane emulsion is 1: 3.
And mixing the polyacrylate microspheres with the size of 400nm with the anionic waterborne polyurethane emulsion, adding carbon powder, mechanically stirring uniformly, and fully dispersing to obtain the high-strength waterborne polyurethane structural color waterproof coating.
3. Wiping the plastic substrate clean and drying, then rolling the prepared coating on the surface of the plastic, and drying at room temperature to obtain the coating with local micro-ordered and macro long-range disordered structure. A uniform red structural color film is formed on the surface of the plastic.
Example 7
1. Dispersing 0.35 weight part of methacrylic acid and 25 weight parts of styrene in deionized water; heating and stirring to 78 ℃, and then adding 0.2 part by weight of ammonium persulfate; the mixture was stirred overnight at 78 ℃. After a crude product is obtained, purifying the crude product to obtain a product; and centrifugally concentrating to obtain the polymethacrylate microspheres with the average particle size of 350 nm.
2. A water-based polyurethane structural color waterproof coating comprises the following components: the adhesive comprises 350nm polymethacrylate microspheres, carbon black and aqueous polyurethane emulsion, wherein the mass ratio of the 350nm polymethacrylate microspheres to the carbon black to the aqueous polyurethane emulsion is 350nm polymethacrylate microspheres: carbon black: aqueous polyurethane emulsion 1: 0.01: 1; the mass ratio of the aqueous polyurethane to the water in the aqueous polyurethane emulsion is 1: 3.
And (3) mixing the 350nm polymethacrylate microspheres with the anionic waterborne polyurethane emulsion, adding carbon powder, mechanically stirring uniformly, and fully dispersing to obtain the high-strength waterborne polyurethane structural color waterproof coating.
3. And wiping the paper substrate clean and drying, then brushing the prepared coating on the surface of the paper, and drying at room temperature to obtain the coating with local micro-ordered and macro long-range disordered structure. And forming a uniform orange-red structural color film on the surface of the paper.
Comparative example 1
1. Dispersing 0.35 weight part of methacrylic acid and 15 weight parts of styrene in deionized water; heating and stirring to 78 ℃, and then adding 0.2 part by weight of ammonium persulfate; the mixture was stirred overnight at 78 ℃. After a crude product is obtained, purifying the crude product to obtain a product; and centrifugally concentrating to obtain the submicron polystyrene microspheres with the average particle size of 210 nm.
2. A water-based polyurethane structural color waterproof coating comprises the following components: the polystyrene microsphere with the particle size of 210nm and the aqueous polyurethane emulsion have the following mass ratio of the polystyrene microsphere with the particle size of 210nm to the aqueous polyurethane emulsion: aqueous polyurethane emulsion 1: 3.
and mixing the 210nm polystyrene microspheres with the anionic waterborne polyurethane emulsion, mechanically stirring uniformly, and fully dispersing to obtain the high-strength waterborne polyurethane structural color waterproof coating.
3. And wiping the glass substrate clean and drying, spraying the prepared coating on the surface of the glass, and drying at room temperature to obtain the coating with local micro-ordered and macro long-range disordered structure. Without the presence of carbon black, the white background scattering masks the red light diffracted by the coating, resulting in a white coating as shown in fig. 5.
Comparative example 2
1. Dispersing 0.35 weight part of methacrylic acid and 15 weight parts of styrene in deionized water; heating and stirring to 78 ℃, and then adding 0.2 part by weight of ammonium persulfate; the mixture was stirred overnight at 78 ℃. After a crude product is obtained, purifying the crude product to obtain a product; and centrifugally concentrating to obtain the submicron polystyrene microspheres with the average particle size of 210 nm.
2. A water-based polyurethane structural color waterproof coating comprises the following components: 210nm polystyrene microspheres, carbon black and aqueous polyurethane emulsion, wherein the mass ratio of the 210nm polystyrene microspheres to the carbon black to the aqueous polyurethane emulsion is 210nm polystyrene microspheres: carbon black: aqueous polyurethane emulsion 1: 0.06: 3.
and mixing the 210nm polystyrene microspheres with the anionic waterborne polyurethane emulsion, adding carbon powder, mechanically stirring uniformly, and fully dispersing to obtain the high-strength waterborne polyurethane structural color waterproof coating.
3. And wiping the glass substrate clean and drying, spraying the prepared coating on the surface of the glass, and drying at room temperature to obtain the coating with local micro-ordered and macro long-range disordered structure. Due to the high carbon black content, the red light diffracted by the photonic crystal is absorbed by the carbon black, resulting in a black coating as shown in fig. 6.
Example 8
The hardness and the waterproof performance of the structural color coatings of examples 1-7 were tested.
The test method comprises the following steps:
hardness: the hardness of the cured pencil was measured according to GB/T6739-2006 and Wolff-Wilbom specifications, and the sample was placed on a table and fixed, the pencil was advanced 1 cm forward of the experimenter at a speed of 1 cm/sec at 45 ° to the table, and the degree of the advancing force was preferably such that the lead was not broken. The pencils were tested in sequence from 6B to 6H (softest to hardest), and the hardness of the pencil that left a scratch on the first pencil was the final pencil hardness.
Waterproof performance: the contact angle of the coating was measured at ambient temperature using a fully automatic contact angle measuring instrument DSA30, measured at 5 different positions on the same sample with water, and the average value was taken as the contact angle of the glue film to water.
The test results are shown in table 1.
TABLE 1
| Hardness of | Water-proof property | |
| Example 1 | 4H | 89.37° |
| Example 2 | 4H | 91.46° |
| Example 3 | 4H | 90.88° |
| Example 4 | 5H | 78.64° |
| Example 5 | 6H | 70.49° |
| Example 6 | 2H | 75.78° |
| Example 7 | 3H | 71.86° |
As can be seen from Table 1, the structural color coating of the present invention has good hardness and water resistance; when the mass ratio of the monodisperse submicron microsphere to the carbon black to the aqueous polyurethane emulsion is that of the monodisperse submicron microsphere: carbon black: aqueous polyurethane emulsion 1: 0.01-0.03: 2-4, the structural color coating has the best hardness; when the mass ratio of the monodisperse submicron microsphere to the carbon black to the aqueous polyurethane emulsion is that of the monodisperse submicron microsphere: carbon black: aqueous polyurethane emulsion 1: 0.01: 3, the structural color coating of the invention has better hardness and optimal waterproof performance.
FIG. 4 is a stress-strain curve of the water-based polyurethane structural color paint and the pure water-based polyurethane paint in example 1, wherein the water-based polyurethane structural color paint and the pure water-based polyurethane paint in example 1 are sequentially arranged from top to bottom; as can be seen from the figure, the pressure of the coating obtained in example 1 was greatly increased compared to the aqueous polyurethane without any component added, indicating that the coating prepared in the present invention has excellent high strength compared to the aqueous polyurethane without any component added.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the protection scope of the present invention, and although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (8)
1. The water-based polyurethane structural color waterproof coating is characterized by comprising the following components: monodisperse submicron microspheres, carbon black and aqueous polyurethane emulsion;
the mass ratio of the monodisperse submicron microsphere to the carbon black to the aqueous polyurethane emulsion is as follows: carbon black: aqueous polyurethane emulsion 1: 0.01-0.05: 1-5;
the average diameter of the monodisperse submicron microsphere is 100-400 nm;
the monodisperse submicron microsphere is one of silicon dioxide, titanium dioxide, polystyrene, polyacrylate and polymethacrylate.
2. The aqueous polyurethane structural color waterproof coating of claim 1, wherein the mass ratio of the monodisperse submicron microsphere to the carbon black to the aqueous polyurethane emulsion is that of the monodisperse submicron microsphere: carbon black: aqueous polyurethane emulsion 1: 0.01-0.03: 2 to 4.
3. The aqueous polyurethane structural color waterproof coating of claim 1, wherein the mass ratio of the monodisperse submicron microsphere to the carbon black to the aqueous polyurethane emulsion is that of the monodisperse submicron microsphere: carbon black: aqueous polyurethane emulsion 1: 0.01: 3.
4. the waterborne polyurethane structural color waterproof coating as claimed in claim 1, wherein the mass ratio of the waterborne polyurethane to the solvent in the polyurethane emulsion is that the waterborne polyurethane: the solvent is 1: 1-5.
5. The water-based polyurethane structural color waterproof coating material according to claim 1, wherein the water-based polyurethane is one of anionic, cationic and nonionic.
6. The preparation method of the water-based polyurethane structural color waterproof coating material of any one of claims 1 to 5 is characterized by comprising the following steps: adding the monodisperse submicron microspheres into the polyurethane emulsion, adding carbon black, and uniformly stirring to obtain the water-based polyurethane structural color waterproof coating.
7. A method for preparing a coating by using the water-based polyurethane structural color waterproof coating as described in claims 1-5 is characterized by comprising the following steps: wiping the substrate clean and drying, then transferring the coating to the surface of the substrate in a spraying, blade coating, brush coating, roller coating or dip coating mode, and drying to obtain the coating with the short-range ordered long-range disordered structure.
8. The method for preparing the coating from the water-based polyurethane structural color waterproof paint as claimed in claim 7, wherein the substrate is glass, metal, textile, ceramic, plastic or paper.
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