Outdoor wear-resistant and weather-resistant inorganic coating and preparation method thereof

Abstract

The invention belongs to the field of outdoor coatings, and discloses an outdoor wear-resistant and weather-resistant inorganic coating and a preparation method thereof. The inorganic coating comprises the following raw material components in parts by weight: 20-40 parts of aluminum silicate powder, 10-18 parts of a modifier, 10-30 parts of calcium carbonate, 5-10 parts of wollastonite, 10-20 parts of titanium dioxide, 8-12 parts of lithium polysilicate, 3-5 parts of a silane coupling agent, 3-5 parts of a dispersant, 0.5-2 parts of polyethyleneimine, 0.5-2 parts of an anti-settling agent, 0.1-1 part of a leveling agent, 0.1-0.2 part of a defoaming agent and 100-200 parts of water. By compounding and modifying various inorganic filler components and adding the acrylic emulsion as an adhesive force modifier and the like, the wear resistance, adhesive force and other properties of the outdoor coating can be remarkably improved, and the durability of the coating is improved.

Description

Technical Field

[0001] The invention belongs to the field of outdoor coatings, and in particular relates to an outdoor wear-resistant and weather-resistant inorganic coating and a preparation method thereof. Background Art

[0002] Outdoor coatings are coatings designed specifically for outdoor environments. They are mainly used for surface protection and beautification of various external structures such as buildings, bridges, roads, and vehicles. Such coatings usually have excellent weather resistance, UV resistance, friction resistance, and corrosion resistance to cope with common natural factors in outdoor environments. At present, organic outdoor coatings such as polyurethane coatings and epoxy coatings are limited in their application due to their high cost and the fact that the products contain volatile organic compounds (VOCs) that will have an impact on the environment and health. Inorganic coatings have obvious advantages in terms of weather resistance, chemical resistance, and environmental protection, and are more suitable for outdoor durability protection. However, there are still many shortcomings in the current inorganic coatings. For example, inorganic coatings may be relatively fragile after drying and prone to cracks. Inorganic outdoor coatings are exposed to wind, sun, rain erosion, and other environments for a long time. After physical friction, they are easily worn and scratched, resulting in damage to the coating surface and a decrease in the protective effect. Some inorganic coatings do not have strong adhesion to the substrate, and they are prone to falling off or peeling off over a long period of time, resulting in a decrease in wear resistance.

[0003] Therefore, how to prepare an outdoor inorganic coating with excellent wear resistance and weather resistance is the technical problem to be solved by the present invention. Summary of the invention

[0004] In order to solve the problems in the background technology, the present invention provides an outdoor wear-resistant and weather-resistant inorganic coating and a preparation method thereof. The present invention can significantly improve the wear resistance and adhesion of the outdoor coating by compounding and modifying a plurality of inorganic filler components and adding acrylic emulsion as an adhesion modifier, thereby improving the durability of the coating.

[0005] In order to achieve the above object, the present invention adopts the following scheme: A wear-resistant and weather-resistant inorganic coating for outdoor use, wherein the inorganic coating raw material components are, by weight, 20-40 parts of aluminum silicate powder, 10-18 parts of a modifier, 10-30 parts of calcium carbonate, 5-10 parts of wollastonite, 10-20 parts of titanium dioxide, 5-10 parts of metakaolin, 8-12 parts of lithium polysilicate, 3-5 parts of a silane coupling agent, 3-5 parts of a dispersant, 0.5-2 parts of polyethyleneimine, 0.5-2 parts of an anti-settling agent, 0.1-1 parts of a leveling agent, 0.1-0.2 parts of a defoaming agent, and 100-200 parts of water; The modifier is a water-based acrylic emulsion, which comes from: Walker VOK®-3066, Hanwha water-based acrylic emulsion resin R-20 or Rhoplex AC-33. Inorganic coatings are usually brittle and hard, and the addition of acrylic emulsion can improve the flexibility of the coating, making it more adaptable to the thermal expansion and contraction of the substrate, reducing the cracking of the coating. Acrylic emulsion can enhance the adhesion between the inorganic coating and the substrate, which can effectively extend the service life of the coating.

[0006] Furthermore, the dispersant is Disperbyk-2010 (BYK) or Solsperse 5000 (Lubrizol); the anti-settling agent is Arkema RHEOTECH M03; the leveling agent is BYK-361 (BYK) or Tego Flow 410 (Evonik); TinosorbM (BASF).

[0007] Furthermore, the lithium polysilicate added in the present invention can enhance the adhesion between the coating and the substrate, especially improve the adhesion and friction resistance on inorganic substrates such as concrete and masonry, and can effectively prevent the coating from peeling off, thereby improving the stability of the inorganic coating in the outdoor environment and increasing the service life. And through the modification of the silane coupling agent, the silane group can interact with the lithium polysilicate, which can enhance the water resistance of the lithium polysilicate after application.

[0008] Furthermore, the silane coupling agent is 3-aminopropyltriethoxysilane or 3-chloropropyltriethoxysilane. Preferably, the silane coupling agent contains amino groups. After the inorganic particles are modified with 3-aminopropyltriethoxysilane, the amino-modified inorganic particles can interact with the carboxylic acid groups in the acrylic emulsion to enhance the adhesion between the two, thereby improving the durability and adhesion of the coating.

[0009] Furthermore, the addition of metakaolin can improve fluidity and formability. The surface of metakaolin has a certain negative charge, which generates electrostatic attraction with cations in the polypropylene emulsion, which is conducive to the formation of a network structure of metakaolin particles in the liquid. This interaction can enhance the dispersibility and stability of metakaolin in the emulsion, and is conducive to improving mechanical properties and weather resistance.

[0010] A method for preparing an outdoor wear-resistant and weather-resistant inorganic coating, the specific preparation steps are: (1) Add water to a silane coupling agent to prepare a silane coupling agent solution with a mass fraction of 1-5%, mix aluminum silicate powder, calcium carbonate, wollastonite, titanium dioxide, metakaolin and lithium polysilicate evenly, mix the mixed material with the silane coupling agent solution with a mass fraction of 1-5%, stir well for 1-3 hours, take out the soaked material, remove excess silane coupling agent solution by filtering or centrifugation, and then dry at 60-80°C to obtain a modified material as mixture A.

[0011] (2) Mixing mixture A with a dispersant, polyethyleneimine and an anti-settling agent, and mixing them using a mixer to obtain a mixture B, and then slowly stirring and mixing the water-based acrylic emulsion, a leveling agent, a defoaming agent and water to obtain a mixture C; (3) Slowly add mixture C into mixture B, stirring while adding, and stirring after adding until a uniform slurry is formed; (4) After adjusting the viscosity according to the needs, use a high shear mixer to mix to ensure the uniformity and fineness of the coating, and finally obtain a wear-resistant and weather-resistant inorganic coating for outdoor use.

[0012] Compared with the prior art, the present invention has the following excellent effects: The present invention selects aluminum silicate powder, calcium carbonate, wollastonite, titanium dioxide, metakaolin, and lithium polysilicate as main components to prepare an inorganic coating, which has high strength, can enhance the wear resistance and impact resistance of the coating, and improve the durability of the coating. Compounding with a water-based acrylic resin and the synergistic effect of the various components can make the coating have a strong adhesion to a substrate (such as a concrete substrate, a brick wall), which helps to improve the adhesion of the coating and reduce peeling and falling off. DETAILED DESCRIPTION

[0013] The principles and features of the present invention are described below. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0014] Example 1: In terms of weight, the raw material components of the inorganic coating are: 30 parts of aluminum silicate powder, 15 parts of water-based acrylic emulsion (VOK®-3066), 20 parts of calcium carbonate, 8 parts of wollastonite, 15 parts of titanium dioxide, 7 parts of metakaolin, 10 parts of lithium polysilicate, 4 parts of 3-aminopropyltriethoxysilane, 3 parts of dispersant, 0.5-2 parts of polyethyleneimine, 0.5 parts of anti-settling agent, 0.3 parts of leveling agent, 0.1 parts of defoaming agent, and 150 parts of water; wherein the dispersant is Solsperse 5000 (Lubrizol); the anti-settling agent is Arkema RHEOTECH M03; the leveling agent is BYK-361 (BYK); (1) Add water to a silane coupling agent to prepare a 5% by mass silane coupling agent solution, mix aluminum silicate powder, calcium carbonate, wollastonite, titanium dioxide, metakaolin, and lithium polysilicate evenly, mix the mixed material with the 5% by mass silane coupling agent solution, stir thoroughly for 2 hours, take out the soaked material, remove excess silane coupling agent solution by filtering or centrifugation, and then dry at 60-80°C to obtain a modified material as mixture A.

[0015] (2) Mixing mixture A with a dispersant, polyethyleneimine and an anti-settling agent, and mixing them using a mixer to obtain a mixture B, and then slowly stirring and mixing the water-based acrylic emulsion, a leveling agent, a defoaming agent and water to obtain a mixture C; (3) Slowly add mixture C into mixture B, stirring while adding, and stirring after adding until a uniform slurry is formed; (4) After adjusting the viscosity according to the needs, use a high shear mixer to mix to ensure the uniformity and fineness of the coating, and finally obtain a wear-resistant and weather-resistant inorganic coating for outdoor use.

[0016] Example 2: In terms of weight, the raw material components of the inorganic coating are: 22 parts of aluminum silicate powder, 10 parts of water-based acrylic emulsion (VOK®-3066), 30 parts of calcium carbonate, 5 parts of wollastonite, 10 parts of titanium dioxide, 7 parts of metakaolin, 8 parts of lithium polysilicate, 3 parts of 3-aminopropyltriethoxysilane, 3 parts of dispersant, 0.5-2 parts of polyethyleneimine, 0.5 parts of anti-settling agent, 0.2 parts of leveling agent, 0.1 parts of defoaming agent, and 120 parts of water; The dispersant is Solsperse 5000 (Lubrizol); the anti-settling agent is Arkema RHEOTECH M03; the leveling agent is BYK-361 (BYK); (1) Add water to a silane coupling agent to prepare a 5% by mass silane coupling agent solution, mix aluminum silicate powder, calcium carbonate, wollastonite, titanium dioxide, metakaolin, and lithium polysilicate evenly, mix the mixed material with the 5% by mass silane coupling agent solution, stir thoroughly for 2 hours, take out the soaked material, remove excess silane coupling agent solution by filtering or centrifugation, and then dry at 60-80°C to obtain a modified material as mixture A.

[0017] (2) Mixing mixture A with a dispersant, polyethyleneimine and an anti-settling agent, and mixing them using a mixer to obtain a mixture B, and then slowly stirring and mixing the water-based acrylic emulsion, a leveling agent, a defoaming agent and water to obtain a mixture C; (3) Slowly add mixture C into mixture B, stirring while adding, and stirring after adding until a uniform slurry is formed; (4) After adjusting the viscosity according to the needs, use a high shear mixer to mix to ensure the uniformity and fineness of the coating, and finally obtain a wear-resistant and weather-resistant inorganic coating for outdoor use.

[0018] Example 3: In terms of weight, the inorganic coating raw material components are: 40 parts of aluminum silicate powder, 18 parts of water-based acrylic emulsion (VOK®-3066), 10 parts of calcium carbonate, 10 parts of wollastonite, 20 parts of titanium dioxide, 7 parts of metakaolin, 12 parts of lithium polysilicate, 5 parts of 3-aminopropyltriethoxysilane, 3 parts of dispersant, 0.5-2 parts of polyethyleneimine, 0.8 parts of anti-settling agent, 1 part of leveling agent, 0.1 parts of defoaming agent, and 180 parts of water; The dispersant is Solsperse 5000 (Lubrizol); the anti-settling agent is Arkema RHEOTECH M03; and the leveling agent is BYK-361 (BYK); (1) Add water to a silane coupling agent to prepare a 5% by mass silane coupling agent solution, mix aluminum silicate powder, calcium carbonate, wollastonite, titanium dioxide, metakaolin, and lithium polysilicate evenly, mix the mixed material with the 5% by mass silane coupling agent solution, stir thoroughly for 2 hours, take out the soaked material, remove excess silane coupling agent solution by filtering or centrifugation, and then dry at 60-80°C to obtain a modified material as mixture A.

[0019] (2) Mixing mixture A with a dispersant, polyethyleneimine and an anti-settling agent, and mixing them using a mixer to obtain a mixture B, and then slowly stirring and mixing the water-based acrylic emulsion, a leveling agent, a defoaming agent and water to obtain a mixture C; (3) Slowly add mixture C into mixture B, stirring while adding, and stirring after adding until a uniform slurry is formed; (4) After adjusting the viscosity according to the needs, use a high shear mixer to mix to ensure the uniformity and fineness of the coating, and finally obtain a wear-resistant and weather-resistant inorganic coating for outdoor use.

[0020] Example 4: Compared with Example 1, Example 4 differs in that: Walker VOK®-3066 water-based acrylic emulsion is replaced with Rhoplex AC-33 water-based acrylic emulsion, and other operations are the same as Example 1.

[0021] Example 5: Compared with Example 1, Example 5 differs in that: Walker VOK®-3066 water-based acrylic emulsion is replaced with Hanwha water-based acrylic emulsion resin R-20, and other operations are the same as Example 1.

[0022] Example 6: Compared with Example 1, Example 6 differs in that 3-aminopropyltriethoxysilane is replaced with 3-chloropropyltriethoxysilane, and other operations are the same as Example 1.

[0023] Comparative Example 1: Compared with Example 1, Comparative Example 1 differs in that it does not contain aqueous acrylic emulsion, and other operations are the same as Example 1.

[0024] Comparative Example 2: Comparative Example 2 is different from Example 1 in that it does not contain polyethyleneimine, but is replaced by a dispersant (Solsperse 5000 (Lubrizol)) of equal mass. Other operations are the same as those of Example 1.

[0025] Comparative Example 3: Compared with Example 1, Comparative Example 3 differs in that it does not contain silane coupling agent modification, that is, it has not been modified with silane coupling agent. Other operations are the same as Example 1.

[0026] Comparative Example 4: Compared with Example 1, Comparative Example 4 differs in that it does not contain lithium polysilicate, and is replaced by wollastonite of equal mass; other operations are the same as those in Example 1.

[0027] Comparative Example 5: Compared with Example 1, Comparative Example 5 differs in that: kaolin is not contained, and titanium dioxide is used instead of kaolin of equal mass; other operations are the same as those in Example 1.

[0028] The coatings obtained in the above examples and comparative examples were scraped onto cement boards using a 200 μm wire rod, dried for 1 hour until the surface was dry, and then the performance was tested after waiting for 24 hours. The performance after the test is shown in Table 1.

[0029] Table 1

[0030] The wear test was carried out according to ASTM D4060 (load 1000 g, wear wheel CS-10, wear machine speed set to 60 rpm, test time 2000 rpm), sample size 50 mm x 150 mm, and wear loss (mg) was tested.

[0031] Water resistance test: Water resistance test is based on JG / T 26-2002 "Exterior Wall Inorganic Architectural Coatings". The coating sample is immersed in water for a certain period of time (168 hours), and then the peeling, blistering and powdering of the coating are observed.

[0032] The testing standard for resistance to artificial aging, stain resistance and washability is: JG / T 26-2002.

[0033] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An outdoor wear-resistant and weather-resistant inorganic coating, characterized in that: The raw material components of the inorganic coating are calculated as follows by weight: 20-40 parts of aluminum silicate powder, 10-18 parts of modifier, 10-30 parts of calcium carbonate, 5-10 parts of wollastonite, 10-20 parts of titanium dioxide, 5-10 parts of metakaolin, 8-12 parts of lithium polysilicate, 3-5 parts of silane coupling agent, 3-5 parts of dispersant, 0.5-2 parts of polyethyleneimine, 0.5-2 parts of anti-settling agent, 0.1-1 parts of leveling agent, 0.1-0.2 parts of defoaming agent, and 100-200 parts of water; wherein the modifier is a water-based acrylic emulsion; and the silane coupling agent is a silane coupling agent containing amino group.

2. The outdoor wear-resistant and weather-resistant inorganic coating according to claim 1, characterized in that: The water-based acrylic emulsion is Walker VOK®-3066, Hanwha water-based acrylic emulsion resin R-20 or Rhoplex AC-33.

3. The outdoor wear-resistant and weather-resistant inorganic coating according to claim 1, characterized in that: The dispersant is Disperbyk-2010 or Solsperse 5000; the anti-settling agent is Arkema RHEOTECH M03; and the leveling agent is BYK-361 or Tego Flow 410.

4. The outdoor wear-resistant and weather-resistant inorganic coating according to claim 1, characterized in that: The silane coupling agent is 3-aminopropyltriethoxysilane.

5. A wear-resistant and weather-resistant inorganic coating for outdoor use prepared by the method according to any one of claims 1 to 4, characterized in that: (1) Add water to a silane coupling agent to prepare a silane coupling agent solution with a mass fraction of 1-5%, mix aluminum silicate powder, calcium carbonate, wollastonite, titanium dioxide, metakaolin, and lithium polysilicate evenly, mix the mixed materials with the silane coupling agent solution with a mass fraction of 1-5%, stir well for 1-3 hours, take out the soaked materials, remove excess silane coupling agent solution by filtering or centrifugation, and then dry at 60-80° C. to obtain a modified material as mixture A; (2) Mixing mixture A with a dispersant, polyethyleneimine and an anti-settling agent, and mixing them using a mixer to obtain a mixture B, and then slowly stirring and mixing the water-based acrylic emulsion, a leveling agent, a defoaming agent and water to obtain a mixture C; (3) Slowly add mixture C into mixture B, stirring while adding, and stirring after adding until a uniform slurry is formed; (4) After adjusting the viscosity according to the needs, use a high shear mixer to mix to ensure the uniformity and fineness of the coating, and finally obtain a wear-resistant and weather-resistant inorganic coating for outdoor use.

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