A granite-textured real stone paint that can utilize solid waste

Abstract

The invention relates to the technical field of coating compositions, and discloses a granite-textured real stone paint coating that can utilize solid waste. Glassy slag particles and / or waste glass particles are used to simulate microcrystals in granite, so that the texture of the microcrystals after being stained with a real stone paint emulsion film is consistent. Whitening powder formed by calcining and crushing discarded gypsum boards is used for whitening, so that the appearance is prevented from being affected by waste glass particles of different colors. Meanwhile, dark gray generated by impurities in the discarded gypsum boards during calcination can simulate black spots in natural granite. Inorganic colloids are formed by using gelling salts to adsorb / encapsulate dyes, thereby preventing dye loss while completing the dyeing of slippery sand that is not easily combined with the dye. Meanwhile, the pH value of the coating is adjusted during the process of forming the colloid, so as to prevent the pH value from being too high and affecting the adhesion of the coating. By combining the above points, the texture of granite is simulated using a pile of solid waste, without using any natural stone powder, and the coating is not only extremely low in cost but also environmentally friendly.

Description

Technical Field

[0001] The present invention relates to the technical field of coating compositions, in particular to a granite-textured real stone paint that can utilize solid waste. Background Art

[0002] Real stone paint is an emerging high-end paint. Natural stone powder is adhered to the exterior wall through real stone paint emulsion to form a paint layer. It can imitate the texture of natural rock without bringing additional load to the structure like dry-hanging stone.

[0003] The texture of natural stone paint is determined by the type and color of the stone powder, as well as the color of any dyes added. Due to cost and construction difficulties, most natural stone paints mimic the texture of sandstone. Imitating the texture of high-end stone materials like marble and granite is difficult and expensive, requiring more expensive raw materials like colored quartz sand, and the appearance differs significantly from natural stone. Even the lower-cost sandstone-like natural stone paint still requires a large amount of colored natural stone powder, which consumes natural resources and is costly.

[0004] Granite is primarily composed of microcrystals of quartz and feldspar (some granite also contains mica), while marble is composed of microcrystals of calcite. However, the inventors discovered in actual construction that even when using colored sand made from these materials to create a true stone paint, the actual effect still differed significantly from that of natural stone. The inventors discovered that the presence of the latex film in true stone paint causes the feldspar and quartz microcrystals to lose the crystalline texture found in natural stone, thus affecting the appearance of the paint. Furthermore, the preparation process of these colored sands inevitably produces a large amount of fine powder, which disrupts the crystal structure of this powder, eliminating the crystalline texture and also affecting the appearance of the true stone paint.

[0005] Glass is an amorphous material, but its appearance is more brilliant than the microcrystals of feldspar and quartz, and it has a more distinct crystalline texture. The inventors found in actual operation that after being disturbed by the real stone paint emulsion film, the glass particles still exhibit a distinct crystalline texture, and the glass fines generated during the preparation process have little significant impact on the texture of the glass particles.

[0006] Glassy slag is a special slag produced during coal combustion or ore smelting (although glassy slag is also produced during glass production, glassy slag does not refer to the slag produced during glass production, but slag with a glass-like texture). It is also known as slag glass. Its main components include silicon oxide, calcium oxide, and magnesium oxide. It is usually dark green and has a glass-like texture. It can easily be mistaken for a glass meteorite.

[0007] Slag usually has obvious alkalinity in aqueous solution system (most "acidic slag" is actually also alkaline in aqueous solution system, and its "acidity" refers to its "ability to absorb oxygen ions" in the furnace). Gypsum will produce a certain amount of calcium oxide after high-temperature calcination (calcium sulfate decomposes at high temperature), which also has obvious alkalinity in aqueous solution system. Summary of the Invention

[0008] The invention provides a granite-textured real stone paint that can utilize solid waste.

[0009] The technical problem to be solved is that real stone paint consumes natural resources and is difficult to imitate the texture of granite.

[0010] To solve the above technical problems, the present invention adopts the following technical solution: a granite-textured real stone paint that can utilize solid waste, wherein the pH value of the real stone paint is 6-10 and the paint comprises the following components in parts by mass:

[0011] Slip sand: 40-60 parts, wherein the slip sand is a mixture of glassy slag particles and waste glass particles, and the mass ratio of the glassy slag particles to the waste glass particles is 1:1-4;

[0012] Whitening powder: 10-15 parts, the whitening powder is formed by calcining and crushing waste gypsum board;

[0013] Real stone paint emulsion: 30 parts;

[0014] Gelling salt: 1-3 parts, the gelling salt is an inorganic salt that can form a white or colorless inorganic colloid at the pH value of the real stone paint;

[0015] Inorganic dye: 0-1 part, the inorganic dye is a dye that can be adsorbed or encapsulated in the inorganic colloid formed by the colloid-forming salt.

[0016] Furthermore, in the slippery sand, at least half of the particles are 20-40 mesh, and the largest particle size is no more than 20; the whitening powder has a mesh size of no less than 800.

[0017] Furthermore, the calcination temperature of the whitening powder is 900-1000° C., and the whitening powder contains anhydrous gypsum, hemihydrate gypsum, calcium oxide, and dust formed after calcination of impurities in waste gypsum boards.

[0018] Furthermore, the gel-forming salt is alum powder.

[0019] Furthermore, the inorganic dye is iron red.

[0020] Furthermore, the sliding surface sand is ellipsoidal particles or flat flake particles.

[0021] Furthermore, the real stone paint emulsion is a pure acrylic emulsion or a silicone acrylic emulsion doped with a thickener, a defoaming agent, and a film-forming aid.

[0022] Furthermore, the real stone paint also contains 1-3 parts of mica powder, and the mesh size of the mica powder is 10-30.

[0023] Compared with the prior art, the granite-textured real stone paint of the present invention that can utilize solid waste has the following beneficial effects:

[0024] In the present invention, glassy slag particles and / or waste glass particles are used to imitate the microcrystals in granite. The texture of these particles after being stained with the real stone paint emulsion film is exactly the same as the microcrystals in granite.

[0025] The paint is whitened by using whitening powder formed by calcining and crushing waste gypsum board to prevent the appearance of waste glass particles of different colors from being affected. At the same time, the dark ash produced by the impurities in the waste gypsum board during the calcination process can perfectly simulate the black spots in natural granite.

[0026] The use of gelling salt to form an inorganic colloid to absorb / encapsulate the dye, thereby preventing the loss of dye while completing the dyeing of the slippery sand that is not easy to combine with the dye (if only the slurry has color, the texture is very strange). At the same time, the gelling salt adjusts the pH value of the paint in the process of forming the colloid to avoid the pH value being too high and affecting the adhesion of the paint (vitreous slag and whitening powder are both obviously alkaline, and real stone paint will have difficulty in adhesion when the pH value is higher than 10);

[0027] By combining the above points, the texture of granite is simulated using a pile of solid waste. No natural stone powder is needed, and all aggregates are solid waste. It is not only extremely low-cost but also green and environmentally friendly. DETAILED DESCRIPTION

[0028] A granite-textured real stone paint that can utilize solid waste, wherein the real stone paint has a pH value of 6-10 and comprises the following components in parts by mass:

[0029] Smoothing sand: 40-60 parts. Smoothing sand is a mixture of vitreous slag particles and waste glass particles. The mass ratio of vitreous slag particles to waste glass particles is 1:1-4, simulating the different crystallites found in natural granite. The vitreous slag particles are used to simulate feldspar, while the waste glass particles are used to simulate quartz. The ratio of the two solid waste particles reflects the feldspar to quartz ratio in granite, with quartz generally being more prominent. Of course, the texture of the smoothing sand differs from the granite surface crystallites, which are more "brilliant." Therefore, some whitening powder is added later to achieve a matte effect. This also overcomes the color effects of the waste glass particles from different sources, ensuring that the different colors of waste glass particles have a similar appearance and a texture similar to quartz particles. This ensures that even colored glass, such as beer bottles, can be used.

[0030] Smooth sand is the absolute main component of the paint. The amount used is 40-60 parts because it is easier to mix at this amount. If it is too much or too little, it will affect the mixing of the paint. Of course, in actual construction, this range can be exceeded as needed, as long as it can be mixed smoothly. Glassy slag can be manually selected from the slag, or the slag can be broken into small pieces and floated based on density differences. Waste glass particles are not strictly required to be colorless glass. Colored glass like beer bottles can also be used because its color is not dark. After being beaten into sand, it has almost no color, and whitening powder is also used later.

[0031] Whitening powder: 10-15 parts, whitening powder is the powder formed by calcining and crushing waste gypsum board;

[0032] Abandoned gypsum board contains a variety of organic impurities, such as organic dirt contaminated during long-term use and glue used in the installation process of the gypsum board. In addition to organic impurities, there is also rust on some iron parts used to install the gypsum board. These impurities often need to be removed when they are recycled, but they do not need to be removed in the present invention because the dark gray formed by these impurities after high-temperature calcination can just simulate the black spots (biotite) in granite. Gypsum will produce a certain amount of calcium oxide during the high-temperature calcination process, and these calcium oxides will promote the subsequent hydrolysis of gelling salts to form inorganic colloids. The amount of whitening powder is determined according to the surface area of ​​the sliding sand, and it must be ensured that it can be wrapped on the surface of the sliding sand.

[0033] Real stone paint emulsion: 30 parts; the real stone paint emulsion here can be purchased directly from the market. During the mixing process, you can add some water to facilitate mixing if necessary.

[0034] Gelling salt: 1-3 parts. Gelling salts are inorganic salts that form white or colorless inorganic colloids at the pH of natural stone paint. The inorganic colloids serve two purposes. One is to prevent dye loss. Among the various dyes used in the dyeing process, organic dyes have poor weather resistance. While inorganic dyes have good weather resistance, they are poorly dispersible and typically form fine, insoluble powders. These powders can remain within the natural stone paint emulsion for a short time, but over time they will leach out, causing the paint to fade. Therefore, a white or colorless inorganic colloid is used to capture these dyes, forming a colored colloid that then flocculates, preventing them from leaching. Another function of the inorganic colloid is to adjust the pH, as both vitreous slag and brightening powder are significantly alkaline, which can affect paint adhesion. Conventional natural stone paint requires alkaline ammonia to adjust the pH, but this requires an acidic gelling salt.

[0035] Inorganic dye: 0-1 part. Inorganic dye is a dye that can be adsorbed or encapsulated in an inorganic colloid formed by a colloid-forming salt.

[0036] The amount of inorganic dye used depends on demand and is not necessarily required. However, if too much is added, it will affect the texture of the real stone paint, making it closer to sandstone. In actual use, it is found that when the inorganic dye exceeds 1 part, the gloss of the smooth sand is almost completely lost and no longer resembles microcrystalline. Inorganic dyes are not necessary for real stone paint, but even if inorganic dyes are not added, gelling salts should be added. They not only fix the inorganic dyes, but also fix the whitening powder and adjust the pH value.

[0037] In the smooth sand, no less than half of the particles are 20-40 mesh, and the largest particle size is no more than 20; this particle size is similar to the particle size of microcrystals in natural granite; the mesh number of whitening powder is not less than 800, so that it is mixed in the real stone paint emulsion film without showing obvious granularity.

[0038] Whitening powder is calcined at 900-1000°C. It contains anhydrous gypsum, hemihydrate gypsum, calcium oxide, and dust formed after the calcination of impurities from discarded gypsum board. This calcination temperature is the temperature required to prepare high-temperature calcined gypsum. It is high enough to generate free calcium oxide, which, when added with water, forms basic calcium sulfate, acting as a catalyst and improving the strength of the coating. However, the raw material here is not natural gypsum, but discarded gypsum board. The impurities in the discarded gypsum board, after calcination, produce dark fly ash that simulates the black spots found in natural granite. The purpose of calcination here is not to produce high-temperature calcined gypsum, but to remove impurities. Therefore, it is sufficient to burn away the impurities; calcination does not require generating a large amount of free calcium oxide. Usually, waste gypsum boards can be burned red with gas under excess air. For industrial production, natural gas can be used as fuel. Under an excess air coefficient of 1.3-1.4, waste gypsum boards can be calcined in an internal continuous gypsum calcining kiln for 0.5-1 hour.

[0039] In addition, when storing, the sliding surface sand, whitening powder, gelling salt and inorganic dye are mixed in the ratio of the real stone paint to obtain the real stone paint powder, and the real stone paint powder is sealed and stored in a moisture-proof packaging bag or packaging container. The gelling salt here cannot be affected by moisture and will be invalid after being affected by moisture, and will cause the real stone paint powder to clump, so it needs to be sealed and stored. The whitening agent can play a desiccant effect. The real stone paint powder and the real stone paint emulsion are mixed on site when in use.

[0040] In this embodiment, the gel-forming salt is alum powder, which is a very common flocculant that easily forms a colloid at a certain pH value and then flocculates the colloid. The inorganic dye is iron oxide red. In actual use, it is found that alum flocculation can fix the iron oxide red into the flocs.

[0041] In the present embodiment, the sliding surface sand is an ellipsoidal particle or a flat flaky particle. Particles of these shapes are more likely to occur during the crushing process than spherical particles (waste glass is usually first broken into strips or triangles during the crushing process, and subsequently forms an ellipsoidal shape during the collision grinding process; and glass slag is easy to form a sheet like peeling an onion during the crushing process), and it also has a larger surface area, better reflective / refractive effect, and is more firmly combined with the real stone paint emulsion. However, it should be noted that the real stone paint in the present embodiment is more likely to scratch the hands of construction workers during use, so it should be avoided to directly grasp and smear the real stone paint during use.

[0042] In this embodiment, the real stone paint emulsion is a pure acrylic emulsion or a silicone acrylic emulsion doped with a thickener, a defoaming agent, and a film-forming aid.

[0043] The thickener, defoamer and film-forming aid (used to ensure that the coating can be carried out normally when the temperature is low) here are all commonly used additives in real stone paint emulsion. The dosage and usage are already very mature. They are added according to actual needs and will not be described in detail. The reason why pure acrylic emulsion or silicone acrylic emulsion is selected and styrene acrylic emulsion is abandoned is because styrene acrylic emulsion will turn yellow after long-term use, which is not a problem for the real stone paint with sandstone texture, but it will affect the granite texture for the present invention. In addition, the thickener selected inside can be commonly used hydroxyethyl cellulose or sodium carboxymethyl cellulose. Sodium carboxymethyl cellulose is not commonly used in real stone paint, but in the experiment we found that it is also an available option.

[0044] The real stone paint also contains 1-3 parts of mica powder, and the mesh number of the mica powder is 10-30. Mica powder is a commonly used additive for embellishment in real stone paint. It is added as appropriate when the customer needs it. No mica powder is added in this embodiment.

[0045] The following is a paint formula that is closest to the texture of common granite stone:

[0046] 50 parts of skid sand, consisting of 36 parts of waste glass particles and 14 parts of glassy slag particles (this ratio is similar to the dark to light parts of natural granite);

[0047] 12 parts whitening powder;

[0048] 30 parts of real stone paint emulsion;

[0049] 1 part gelling salt;

[0050] The amount of inorganic dyes is adjusted according to color requirements and generally does not need to be added.

[0051] The embodiments described above are merely descriptions of preferred implementations of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should fall within the scope of protection determined by the claims of the present invention.

Claims

1. A granite-textured real stone paint that can utilize solid waste, characterized by: The pH value of the real stone paint is 6-10, and it contains the following components in parts by mass: Slip sand: 40-60 parts, wherein the slip sand is a mixture of glassy slag particles and waste glass particles, and the mass ratio of the glassy slag particles to the waste glass particles is 1:1-4; Glassy slag particles are used to imitate feldspar in granite, while waste glass particles are used to imitate quartz in granite. The texture of smooth sand is different from the microcrystals on the surface of granite, so whitening powder is needed to achieve a matte effect and overcome the color influence of waste glass particles from different sources; Whitening powder: 10-15 parts, the whitening powder is formed by calcining and crushing waste gypsum board; Real stone paint emulsion: 30 parts; the real stone paint emulsion is a pure acrylic emulsion or silicone acrylic emulsion doped with a thickener, a defoaming agent, and a film-forming aid; Gelling salt: 1-3 parts, the gelling salt is alum powder; the gelling salt fixes the inorganic dye and brightening powder to prevent them from being lost from the real stone paint emulsion film; Inorganic dye: 0-1 part, the inorganic dye is a dye that can be adsorbed or encapsulated in the inorganic colloid formed by the colloid-forming salt.

2. The granite-textured real stone paint that can utilize solid waste according to claim 1, characterized in that: In the slippery sand, at least half of the particles are 20-40 mesh, and the mesh number of the largest particle is not greater than 20; the mesh number of the whitening powder is not less than 800.

3. The granite-textured real stone paint that can utilize solid waste according to claim 1, characterized in that: The calcination temperature of the whitening powder is 900-1000° C. The whitening powder contains anhydrous gypsum, hemihydrate gypsum, calcium oxide, and dust formed by calcining impurities in waste gypsum boards.

4. The granite-textured real stone paint that can utilize solid waste according to claim 1, characterized in that: The inorganic dye is iron red.

5. The granite-textured real stone paint that can utilize solid waste according to claim 1, characterized in that: The sliding surface sand is in the form of ellipsoidal particles or flat flake particles.

6. The granite-textured real stone paint that can utilize solid waste according to claim 1, characterized in that: The real stone paint further comprises 1-3 parts of mica powder, and the mesh number of the mica powder is 10-30.