Preparation method of water-based architectural decoration coating

Abstract

According to the preparation method of the water-based building decoration coating, the compound can be efficiently dispersed in the coating, the color and luster of the coating can be effectively maintained for a long time, and the overall lubricity, corrosion resistance and cracking resistance of the coating are good.

Description

Technical Field

[0001] This invention relates to a method for preparing a green and environmentally friendly water-based architectural decorative coating, and more particularly to a color-stable environmentally friendly water-based architectural coating. Background Technology

[0002] Water-based coatings come in three types: water-soluble coatings, water-dilutable coatings, and water-dispersible coatings. Water, as a solvent, effectively reduces the VOC content of the product, minimizing environmental pollution and increasing safety. Application is relatively simple, but various additives must be added to improve performance. Water-based coatings are gradually becoming the mainstream direction of modern coating development. Building energy conservation plays an indispensable role in my country's development. Currently, the main building materials used for exterior walls in my country are clay, ceramic tiles, and mosaic products. The use of architectural coatings in China is relatively low, while in developed countries, their usage reaches 80%, indicating a deficiency in my country's architectural coating usage. Assuming energy-saving decorations are added to Chinese buildings and insulation layers are applied to new building surfaces, energy savings could reach 7 trillion yuan by the end of 2023. Applying thermal insulation coatings to the surfaces of some mechanical equipment containers and pipelines can also achieve similar effects to increase energy efficiency. Therefore, considering my country's geographical location, developing thermal insulation coatings adapted to local conditions can effectively enhance building livability, improve functionality, and increase the efficiency of mechanical equipment. High-performance, environmentally friendly, and energy-saving materials will become a breakthrough in solving thermal insulation and energy conservation issues. Surface insulation can reduce the thickness of walls or equipment to some extent, thereby reducing material costs while providing good insulation. In terms of energy conservation, the good insulation effect of building exterior walls and equipment surfaces, with its superior performance, represents an important development direction for modern thermal insulation exterior finishing materials.

[0003] Epoxy resins, due to their presence of epoxy groups and other special functional groups, possess strong adhesion and good anti-corrosion properties, thus enjoying widespread use in coatings. In recent years, with increasing emphasis on environmental protection and healthy living, green lifestyles have become more popular. However, solvent-based coatings generally contain high levels of volatile organic compounds (VOCs), and excessive use can harm the health of coating application workers and those living in the environment. Therefore, the preparation of waterborne epoxy coatings is particularly important.

[0004] Waterborne epoxy anticorrosive coatings mainly consist of primary film-forming substances (base material), pigments, fillers, and additives. The primary film-forming substances are mainly composed of two components: hydrophilic amine curing agents and hydrophobic epoxy resins. The emulsification of the epoxy resin and the ratio and compatibility between the epoxy resin and the curing agent directly affect the anticorrosive performance. In the preparation of novel waterborne anticorrosive coatings, the effective application of the properties of the base material and pigments / fillers in the coating is a primary consideration.

[0005] CN110713786A discloses a UV-curable coating, its preparation method, application, and coated parts. The UV-curable coating comprises the following components in weight percentages: 20-30% modified aliphatic polyurethane acrylic resin, 10-20% acrylated acrylic resin, 1.5-2.5% acylphosphine initiator, 0.5-1% hydroxyketone initiator, and the balance being solvent. This coating can be cured with a UV A lamp, eliminating the need for a mercury lamp. It offers simple protection, minimal harm to the human body, and can form a relatively thick film. The curing speed is fast and uniform, with good adhesion to the substrate and high hardness. During subsequent sanding, it avoids issues such as sandpaper sticking, poor adhesion, and cracking. The black pigment includes at least one of carbon black, iron oxide black, copper chromium black, cobalt black, aniline black, or antimony sulfide.

[0006] CN111069007A discloses a treatment process for improving the fingerprint resistance of piano lacquer furniture surfaces, relating to the field of furniture coating technology. The specific process is as follows: 1) Pre-treatment of diatomaceous earth; 2) Adding pre-treated diatomaceous earth to a mixture of potassium permanganate and aluminum nitrate solutions, reacting to obtain a diatomaceous earth composite; 3) Adding a sulfur source and an antimony source to the diatomaceous earth composite dispersion to obtain a diatomaceous earth composite loaded with antimony sulfide; 4) Preparing a stable transparent coating; 5) Spraying the transparent coating onto the surface of piano lacquer furniture parts, followed by constant-temperature heat treatment and surface polishing. This treatment process effectively reduces the adhesion of sweat to the surface of piano lacquer furniture, making it less prone to fingerprints, improving the aesthetics of the piano lacquer furniture, and allowing it to maintain a mirror-like high-gloss effect for a long time. In process step 3), the ultrasonic dispersion power is 200-300W, and the dispersion time is 10-20min; the concentration of the dispersion is 1-3mg / ml; the molar ratio of deionized water to thioacetamide in the dispersion is 600-800:1, and the molar ratio of thioacetamide to potassium tartrate is 4-7:1; the ultrasonic treatment power is 230-320W, and the treatment time is 10-15min; the stirring speed is 150-200r / min, and the stirring time is 20-30min. By loading antimony sulfide into the diatomaceous earth composite, the loaded antimony sulfide, during the subsequent heat treatment curing process, [the antimony sulfide loaded in the diatomaceous earth composite...] Agglomeration occurs between antimony sulfide particles, and some network structures grow from the surface. As the heat treatment and solidification process proceeds, the antimony sulfide particles gradually decrease, and the "tentacles" of the network structure continue to grow and connect with each other, so that the substrate is completely covered by the network structure. Since the network structure "tentacles" formed gradually grow outward from the surface of the diatomaceous earth composite, and the antimony sulfide content loaded on the diatomaceous earth composite is almost the same, the growth amount of the network structure "tentacles" gradually growing outward from the surface of the diatomaceous earth composite is almost the same. This results in a uniform and equidistant distribution between the diatomaceous earth composite particles, and the outward growth of the network structure "tentacles" also increases the spacing between the diatomaceous earth composite particles. Summary of the Invention

[0007] Based on the above-mentioned use of antimony sulfide in coatings, this invention provides a method for preparing a green and environmentally friendly water-based architectural decorative coating, wherein the pigment is a dendritic antimony sulfide and graphene composite. The composite can be efficiently dispersed in the coating and can effectively maintain the color of the coating for a long time, that is, the color is stable. The overall lubricity, corrosion resistance and crack resistance of the coating are all good.

[0008] Specifically: A method for preparing a water-based architectural decorative coating includes the following steps: (1) Add an appropriate amount of deionized water according to the mass ratio, control the stirring speed to 400 r / min, and add 2-3 parts of BYK-C450 rheology modifier, 4-5 parts of OROTAN1618 dispersant, 1-2 parts of TEGO8030 defoamer, 2-4 parts of pigment A, 5-9 parts of pigment B and 10-15 parts of 800 mesh talc filler in sequence. After mechanically stirring evenly, grind to obtain a grinding slurry with a fineness ≤30 μm; (2) Continue stirring and add 30-40 parts of waterborne epoxy emulsion, 1-1.5 parts of BYK-192 wetting agent, 1-2 parts of BYK-A530 defoamer, and 3-5 parts of ethylene glycol ethyl ether film-forming aid to the above grinding slurry, and continue stirring for more than 15 minutes; (3) Add 25-35 parts of EPIKURE8538-Y-68 polyamine waterborne curing agent and 10-40 parts of deionized water to obtain the waterborne architectural decorative coating; (4) Apply the water-based coating evenly to the substrate surface using an air spray gun.

[0009] The thickness of the coating applied by the air spray gun is 30-60 μm.

[0010] The coating is used on building walls.

[0011] Pigment A is a mixture of antimony sulfide and graphene.

[0012] Pigment B is iron oxide red pigment.

[0013] A waterborne epoxy architectural coating composition, comprising the following components by weight: 30-40 parts waterborne epoxy emulsion; 1-1.5 parts BYK-192 wetting agent; 1-2 parts BYK-A530 defoamer; 3-5 parts ethylene glycol ethyl ether film-forming aid; 2-3 parts BYK-C450 rheology modifier; 4-5 parts OROTAN1618 dispersant; 1-2 parts TEGO8030 defoamer; 2-4 parts pigment A; 5-9 parts pigment B; 10-15 parts 800-mesh talc filler; 25-35 parts EPIKURE8538-Y-68 polyamine waterborne curing agent; and 10-40 parts deionized water.

[0014] The coating is applied to the substrate surface by spraying, rolling, or brushing.

[0015] Pigment A is a mixture of antimony sulfide and graphene, prepared through the following steps: (1) Dissolve 4-5g of antimony trichloride in 300-400ml of ethylene glycol aqueous solution with a volume ratio of 3-4:1, then add 1-2g of barium chloride and 4-5g of tartaric acid powder, stir at 100-200rpm for 5-10min, then slowly add 40-50ml of 25-28 wt.% ammonia water, let stand, filter, and wash to obtain barium antimony hydroxide BaSb(OH)5; (2) Disperse 4-5 mM barium antimony hydroxide powder in a hydrothermal reactor containing 0.6-0.8 g sodium dodecylbenzenesulfonate in 300-350 mL of deionized water, then add 4-5 g of 5-10 wt.% graphene oxide dispersion, 10-15 mM thiocarbamate ethyl ester and 10-12 mM EDTA. Stir at 100-200 rpm for 5-10 min, then seal the reactor and heat it to 120-130℃ at 4-5℃ / min for 1-2 h of continuous hydrothermal treatment. After natural cooling, filter and wash. (3) Place the product obtained in step (2) inside a tube furnace, introduce 2-3 vol.% H2 / N2 mixed gas for 2-3 min, raise the temperature to 250-300℃ at a rate of 1-2℃ / min, keep the temperature constant for 2-3 h, and then cool naturally to room temperature. Stop the supply of mixed gas to obtain a mixture of antimony sulfide and graphene.

[0016] The antimony sulfide is loaded onto the surface of graphene, and the morphology of the graphene is shown in the attached figure. Figure 1 As shown in the attached figure, the morphology of antimony sulfide is as follows. Figure 3 As shown, it exhibits a dendritic structure, with the trunk diameter being approximately 50-60 nm and the branch diameter being approximately 20-30 nm.

[0017] The precursor solution of this invention consists of antimony and barium metal ions, but the product contains only antimony metal. This is because, under hydrothermal conditions, barium ions complex with excess EDTA in the solution, while antimony ions react directly with thiooxazone to form antimony sulfide deposits. These deposits are then obtained through subsequent filtration and washing, followed by thermal reducing atmosphere treatment to finally obtain dendritic antimony sulfide. The dendritic morphology of antimony sulfide is primarily related to barium ions, which may guide the formation of the morphology. This conclusion is obtained through comparison of examples and comparative examples. Dendritic antimony sulfide can improve its dispersion in coatings, thereby affecting the color stability of the coating.

[0018] Beneficial technical effects: This invention is the first to discover the preparation of dendritic nano-sized antimony sulfide using barium ions as a guide agent. The antimony sulfide can be highly dispersed in the coating, thereby affecting the final color effect of the coating, especially showing high stability in the color of epoxy coatings with iron oxide red as pigment. Attached Figure Description

[0019] Appendix Figure 1 The graphene morphology diagram of this invention.

[0020] Appendix Figure 2 XRD patterns of embodiments and comparative examples of the present invention.

[0021] Appendix Figure 3 The present invention describes the dendritic antimony sulfide morphology. Detailed Implementation Example 1

[0022] A method for preparing a water-based architectural decorative coating includes the following steps: (1) Add an appropriate amount of deionized water according to the mass ratio, control the stirring speed to 400 r / min, and add 2 parts of BYK-C450 rheology modifier, 4 parts of OROTAN1618 dispersant, 1 part of TEGO8030 defoamer, 2 parts of pigment A, 5 parts of iron oxide red pigment B and 10 parts of 800 mesh talc filler in sequence. After mechanically stirring evenly, grind to obtain grinding slurry with a fineness ≤30 μm; (2) Continue stirring and add 30 parts of waterborne epoxy emulsion, 1 part of BYK-192 wetting agent, 1 part of BYK-A530 defoamer, and 3 parts of ethylene glycol ethyl ether film-forming aid to the above grinding slurry, and continue stirring for more than 15 minutes; (3) Add 25 parts of EPIKURE8538-Y-68 polyamine waterborne curing agent and 10 parts of deionized water to obtain the waterborne architectural decorative coating; (4) Apply the water-based coating evenly to the substrate surface using an air spray gun.

[0023] Pigment A is a mixture of antimony sulfide and graphene, prepared through the following steps: (1) Dissolve 4g of antimony trichloride in 300ml of ethylene glycol aqueous solution with a volume ratio of 3:1, then add 1g of barium chloride and 4g of tartaric acid powder, stir at 100rpm for 5min, then slowly add 40ml of 25-28 wt.% ammonia water, let stand, filter, and wash to obtain barium antimony hydroxide BaSb(OH)5; (2) Disperse 4 mM barium antimony hydroxide powder in a hydrothermal reactor containing 0.6 g sodium dodecylbenzenesulfonate in 300 mL of deionized water, then add 4 g of 5 wt.% graphene oxide dispersion, 10 mM thiocarbamate ethyl ester and 10 mM EDTA. Stir at 100 rpm for 5 min, then seal the reactor and heat it to 120 °C at 4 °C / min for 1 h. After natural cooling, filter and wash. (3) Place the product obtained in step (2) inside a tube furnace, introduce 2 vol.% H2 / N2 mixed gas for 2 min, raise the temperature to 250°C at a rate of 1°C / min, keep the temperature constant for 2 h, and then let it cool naturally to room temperature. Stop the supply of mixed gas to obtain a mixture of antimony sulfide and graphene. Example 2

[0024] A method for preparing a water-based architectural decorative coating includes the following steps: (1) Add an appropriate amount of deionized water according to the mass ratio, control the stirring speed to 400 r / min, and add 2.5 parts of BYK-C450 rheology modifier, 4.5 parts of OROTAN1618 dispersant, 1.5 parts of TEGO8030 defoamer, 3 parts of pigment A, 7 parts of iron oxide red pigment B and 12.5 parts of 800 mesh talc filler in sequence. After mechanically stirring evenly, grind to obtain grinding slurry with a fineness ≤30 μm; (2) Continue stirring and add 35 parts of waterborne epoxy emulsion, 1.25 parts of BYK-192 wetting agent, 1.5 parts of BYK-A530 defoamer, and 4 parts of ethylene glycol ethyl ether film-forming aid to the above grinding slurry, and continue stirring for more than 15 minutes. (3) Add 30 parts of EPIKURE8538-Y-68 polyamine waterborne curing agent and 25 parts of deionized water to obtain the waterborne architectural decorative coating; (4) Apply the water-based coating evenly to the substrate surface using an air spray gun.

[0025] Pigment A is a mixture of antimony sulfide and graphene, prepared through the following steps: (1) Dissolve 4.5g of antimony trichloride in 350ml of ethylene glycol aqueous solution with a volume ratio of 3.5:1, then add 1.5g of barium chloride and 4.5g of tartaric acid powder, stir at 150rpm for 7.5min, then slowly add 45ml of 25-28 wt.% ammonia water, let stand, filter, and wash to obtain barium antimony hydroxide BaSb(OH)5; (2) Disperse 4-5 mM barium antimony hydroxide powder in a hydrothermal reactor containing 0.7 g sodium dodecylbenzenesulfonate in 325 mL of deionized water, then add 4.5 g of 7.5 wt.% graphene oxide dispersion, 12.5 mM thiocarbamate ethyl ester and 11 mM EDTA. Stir at 150 rpm for 7.5 min, then seal the reactor and heat to 125 °C at 4.5 °C / min for continuous hydrothermal treatment for 1.5 h. After natural cooling, filter and wash. (3) Place the product obtained in step (2) inside a tube furnace, introduce 2.5 vol.% H2 / N2 mixed gas for 2.5 min to exhaust the air inside the tube, continue to introduce 2.5 vol.% H2 / N2 mixed gas, raise the temperature to 275℃ at a rate of 1.5℃ / min, keep the temperature for 2.5 h and then cool naturally to room temperature, stop the supply of mixed gas, and obtain a mixture of antimony sulfide and graphene. Example 3

[0026] A method for preparing a water-based architectural decorative coating includes the following steps: (1) Add an appropriate amount of deionized water according to the mass ratio, control the stirring speed to 400 r / min, and add 3 parts of BYK-C450 rheology modifier, 5 parts of OROTAN1618 dispersant, 2 parts of TEGO8030 defoamer, 4 parts of pigment A, 9 parts of iron oxide red pigment B and 15 parts of 800 mesh talc filler in sequence. After mechanically stirring evenly, grind to obtain grinding slurry with a fineness ≤30 μm; (2) Continue stirring and add 40 parts of waterborne epoxy emulsion, 1.5 parts of BYK-192 wetting agent, 2 parts of BYK-A530 defoamer, and 5 parts of ethylene glycol ethyl ether film-forming aid to the above grinding slurry, and continue stirring for more than 15 minutes; (3) Add 35 parts of EPIKURE8538-Y-68 polyamine waterborne curing agent and 40 parts of deionized water to obtain the waterborne architectural decorative coating; (4) Apply the water-based coating evenly to the substrate surface using an air spray gun.

[0027] Pigment A is a mixture of antimony sulfide and graphene, prepared through the following steps: (1) Dissolve 5g of antimony trichloride in 400ml of ethylene glycol aqueous solution with a volume ratio of 4:1, then add 2g of barium chloride and 5g of tartaric acid powder, stir at 200rpm for 10min, then slowly add 50ml of 25-28 wt.% ammonia water, let stand, filter, and wash to obtain barium antimony hydroxide BaSb(OH)5; (2) Disperse 5 mM barium antimony hydroxide powder in a hydrothermal reactor containing 0.8 g sodium dodecylbenzenesulfonate in 350 mL of deionized water, then add 5 g of 10 wt.% graphene oxide dispersion, 15 mM thiocarbamate ethyl ester and 12 mM EDTA. Stir at 200 rpm for 10 min, then seal the reactor and heat it to 130 °C at 5 °C / min for 2 h. After natural cooling, filter and wash. (3) Place the product obtained in step (2) inside a tube furnace, introduce 3 vol.% H2 / N2 mixed gas for 3 min, raise the temperature to 300°C at a rate of 2°C / min, keep the temperature constant for 3 h, and then let it cool naturally to room temperature. Stop the supply of mixed gas to obtain a mixture of antimony sulfide and graphene.

[0028] Comparative Example 1. Pigment A is antimony sulfide, prepared by the following steps: (1) Dissolve 4.5g of antimony trichloride in 350ml of ethylene glycol aqueous solution with a volume ratio of 3.5:1, then add 1.5g of barium chloride and 4.5g of tartaric acid powder, stir at 150rpm for 7.5min, then slowly add 45ml of 25-28 wt.% ammonia water, let stand, filter, and wash to obtain barium antimony hydroxide BaSb(OH)5; (2) Disperse 4-5 mM barium antimony hydroxide powder in a hydrothermal reactor containing 0.7 g sodium dodecylbenzenesulfonate in 325 mL of deionized water, then add 12.5 mM thiocarbamate ethyl ester and 11 mM EDTA. Stir at 150 rpm for 7.5 min, then seal the reactor and heat to 125 °C at 4.5 °C / min for 1.5 h of continuous hydrothermal treatment. After natural cooling, filter and wash. (3) Place the product obtained in step (2) inside a tube furnace, introduce 2.5 vol.% H2 / N2 mixed gas for 2.5 min to exhaust the air inside the tube, continue to introduce 2.5 vol.% H2 / N2 mixed gas, raise the temperature to 275℃ at a rate of 1.5℃ / min, keep the temperature for 2.5 h and then cool naturally to room temperature, stop the supply of mixed gas, and obtain a mixture of antimony sulfide and graphene.

[0029] Comparative Example 2. The pigment A is antimony sulfide, prepared by the following steps: (1) Dissolve 4.5g of antimony trichloride in 350ml of ethylene glycol aqueous solution with a volume ratio of 3.5:1, then add 4.5g of tartaric acid powder, stir at 150rpm for 7.5min, then slowly add 45ml of 25-28 wt.% ammonia water, let stand, filter, and wash to obtain hydroxide; (2) Disperse 4-5 mM hydroxide powder in a hydrothermal reactor containing 0.7 g sodium dodecylbenzenesulfonate in 325 mL of deionized water, then add 12.5 mM thiocarbamate ethyl ester and 11 mM EDTA. Stir at 150 rpm for 7.5 min, then seal the reactor and heat to 125 °C at 4.5 °C / min for 1.5 h. After natural cooling, filter and wash. (3) Place the product obtained in step (2) inside a tube furnace, introduce 2.5 vol.% H2 / N2 mixed gas for 2.5 min to exhaust the air inside the tube, continue to introduce 2.5 vol.% H2 / N2 mixed gas, raise the temperature to 275℃ at a rate of 1.5℃ / min, keep the temperature for 2.5 h and then cool naturally to room temperature, stop the supply of mixed gas, and obtain antimony sulfide.

[0030] Appendix Figure 2 To obtain the XRD results for the preparation of antimony sulfide, the attached... Figure 2 It can be seen that when graphene is present in Example 2, the main XRD diffraction peaks are the carbon peaks of graphene, and there are no diffraction peaks of antimony sulfide. This means that antimony sulfide is dispersed at high speed on the surface of graphene, and therefore there are no diffraction peaks of antimony sulfide.

[0031] See Comparative Examples 1 and 2. Comparative Example 1 did not include graphene parameters in the preparation of antimony sulfide to reduce the influence of graphene on XRD. Comparative Example 2 did not include graphene or barium ions; these parameters were added by appendix. Figure 2 The XRD results show that, regardless of the presence of barium ions, the product only has the diffraction peak of Sb2S3, which verifies the hypothesis of this invention. In the hydrothermal process, barium antimony hydroxide exists in the solution under hydrothermal conditions, with barium ions complexing with excess EDTA, while antimony ions react directly with thiocarbamate ethyl ester to form antimony sulfide precipitate. High-purity antimony sulfide precipitate is obtained through subsequent filtration and washing.

[0032] Comparative Example 3. A method for preparing a water-based architectural decorative coating, comprising the following steps: (1) Add an appropriate amount of deionized water according to the mass ratio, control the stirring speed to 400 r / min, and add 2.5 parts of BYK-C450 rheology modifier, 4.5 parts of OROTAN1618 dispersant, 1.5 parts of TEGO8030 defoamer, 3 parts of pigment A, 7 parts of iron oxide red pigment B and 12.5 parts of 800 mesh talc filler in sequence. After mechanically stirring evenly, grind to obtain grinding slurry with a fineness ≤30 μm; (2) Continue stirring and add 35 parts of waterborne epoxy emulsion, 1.25 parts of BYK-192 wetting agent, 1.5 parts of BYK-A530 defoamer, and 4 parts of ethylene glycol ethyl ether film-forming aid to the above grinding slurry, and continue stirring for more than 15 minutes. (3) Add 30 parts of EPIKURE8538-Y-68 polyamine waterborne curing agent and 25 parts of deionized water to obtain the waterborne architectural decorative coating; (4) Apply the water-based coating evenly to the substrate surface using an air spray gun.

[0033] Pigment A is a mixture of antimony sulfide and graphene, prepared through the following steps: (1) Dissolve 4.5g of antimony trichloride in 350ml of ethylene glycol aqueous solution with a volume ratio of 3.5:1, then add 4.5g of tartaric acid powder, stir at 150rpm for 7.5min, then slowly add 45ml of 25-28 wt.% ammonia water, let stand, filter, and wash to obtain hydroxide; (2) Disperse 4-5 mM hydroxide powder in a hydrothermal reactor containing 0.7 g sodium dodecylbenzenesulfonate in 325 mL of deionized water, then add 4.5 g of 7.5 wt.% graphene oxide dispersion, 12.5 mM thiocarbamate ethyl ester and 11 mM EDTA. Stir at 150 rpm for 7.5 min, then seal the reactor and heat to 125 °C at 4.5 °C / min for continuous hydrothermal treatment for 1.5 h. After natural cooling, filter and wash. (3) Place the product obtained in step (2) inside a tube furnace, introduce 2.5 vol.% H2 / N2 mixed gas for 2.5 min to exhaust the air inside the tube, continue to introduce 2.5 vol.% H2 / N2 mixed gas, raise the temperature to 275℃ at a rate of 1.5℃ / min, keep the temperature for 2.5 h and then cool naturally to room temperature, stop the supply of mixed gas, and obtain a mixture of antimony sulfide and graphene.

[0034] Comparative Example 4. A method for preparing a water-based architectural decorative coating, comprising the following steps: (1) Add an appropriate amount of deionized water according to the mass ratio, control the stirring speed to 400 r / min, and add 2.5 parts of BYK-C450 rheology modifier, 4.5 parts of OROTAN1618 dispersant, 1.5 parts of TEGO8030 defoamer, 7 parts of iron oxide red pigment B and 12.5 parts of 800 mesh talc filler in sequence. After mechanically stirring evenly, grind to obtain grinding slurry with a fineness ≤30 μm; (2) Continue stirring and add 35 parts of waterborne epoxy emulsion, 1.25 parts of BYK-192 wetting agent, 1.5 parts of BYK-A530 defoamer, and 4 parts of ethylene glycol ethyl ether film-forming aid to the above grinding slurry, and continue stirring for more than 15 minutes. (3) Add 30 parts of EPIKURE8538-Y-68 polyamine waterborne curing agent and 25 parts of deionized water to obtain the waterborne architectural decorative coating; (4) Apply the water-based coating evenly to the substrate surface using an air spray gun.

[0035]

[0036] Currently, there are many methods (or modes) for representing color, among which the Lab color model is widely used in the building materials industry. This color model is a color calibration model specified by the International Commission on Illumination (CIE), where the L value represents lightness, ranging from 0 to 100, with 0 being the darkest and 100 being the whitest; the a value represents the color change from green to red; and the b value represents the color change from blue to yellow. Color tests were conducted on the coatings obtained in Example 2, Comparative Example 3, and Comparative Example 4. The main difference between Comparative Example 3 and Example 2 is that Comparative Example 3 does not contain barium ions. The loss of barium ions leads to a significant difference in the morphology of the antimony sulfide product compared to Example 2. The antimony sulfide morphology of Comparative Example 3 is disordered, consisting of irregular spheres. Comparative Example 4 is a blank example; the coating in this example does not contain pigment A. As can be seen from the table above, Example 2 showed a more stable Lab value compared to Comparative Examples 3-4, without drastic changes. In contrast, Comparative Examples 3 and 4 showed obvious changes. The table above proves that the morphology of antimony sulfide and antimony sulfide-graphene as a pigment itself have a significant impact on the color stability of the coating.

[0037] The description and application of the present invention herein are illustrative and not intended to limit the scope of the invention to the embodiments described above. Variations and modifications of the embodiments disclosed herein are possible, and various substitutions and equivalents of the components are well known to those skilled in the art. It will be apparent to those skilled in the art that the invention can be implemented in other forms, structures, arrangements, proportions, and with other components, materials, and parts without departing from the spirit or essential characteristics of the invention. Other variations and modifications can be made to the embodiments disclosed herein without departing from the scope and spirit of the invention.

Claims

1. A method for preparing a water-based architectural decorative coating, characterized in that... Includes the following steps: (1) Add an appropriate amount of deionized water according to the mass ratio, control the stirring speed to 400 r / min, and add 2-3 parts of BYK-C450 rheology modifier, 4-5 parts of OROTAN1618 dispersant, 1-2 parts of TEGO8030 defoamer, 2-4 parts of pigment A, 5-9 parts of pigment B and 10-15 parts of 800 mesh talc filler in sequence. After mechanically stirring evenly, grind to obtain a grinding slurry with a fineness ≤30 μm; (2) Continue stirring and add 30-40 parts of waterborne epoxy emulsion, 1-1.5 parts of BYK-192 wetting agent, 1-2 parts of BYK-A530 defoamer, and 3-5 parts of ethylene glycol ethyl ether film-forming aid to the above grinding slurry, and continue stirring for more than 15 minutes; (3) Add 25-35 parts of EPIKURE8538-Y-68 polyamine waterborne curing agent and 10-40 parts of deionized water to obtain the waterborne architectural decorative coating; (4) Apply the water-based coating evenly to the substrate surface using an air spray gun.

2. The method for preparing a water-based architectural decorative coating as described in claim 1, characterized in that... The thickness of the coating applied by the air spray gun is 30-60 μm.

3. The method for preparing a water-based architectural decorative coating as described in claim 1, characterized in that... The coating is used on building walls.

4. The method for preparing a water-based architectural decorative coating as described in claim 1, characterized in that... Pigment A is a mixture of antimony sulfide and graphene.

5. The method for preparing a water-based architectural decorative coating as described in claim 1, characterized in that... Pigment B is iron oxide red pigment.

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