Thermal insulation fire-retardant anticorrosive paint and preparation method thereof

Abstract

This application relates to the field of coating technology, specifically disclosing a heat-insulating, flame-retardant, and anti-corrosion coating and its preparation method. A heat-insulating, flame-retardant, and anti-corrosion coating comprises the following raw materials in parts by weight: 50-80 parts of silicone-acrylic emulsion, 10-15 parts of epoxy resin, 30-40 parts of heat-insulating microcapsules, 15-21 parts of hollow glass microspheres, 3-5 parts of dispersant, 0.5-2 parts of polypropylene glycol diglycidyl ether, 1-5 parts of leveling agent, and 15-20 parts of water. The heat-insulating microcapsules comprise an aluminum powder core and a heat-insulating and flame-retardant capsule wall layer, the capsule wall layer material comprising acrylic resin and polyamide resin. The preparation method is as follows: hollow glass microspheres and heat-insulating microcapsules are added to silicone-acrylic emulsion and water and dispersed evenly to obtain a mixture; the dispersant, polypropylene glycol diglycidyl ether, epoxy resin, and leveling agent are added to the above mixture and mixed evenly to obtain the interior wall insulation coating. The composition of this application achieves a comprehensive improvement in heat insulation, flame retardancy, and anti-corrosion performance.

Description

Technical Field

[0001] This application relates to the field of coating technology, and more specifically, to a heat-insulating, flame-retardant, and anti-corrosion coating and its preparation method. Background Technology

[0002] With the rapid development of modern industrial technology and the acceleration of urbanization, the operating environment faced by buildings, vehicles, power equipment and various industrial facilities is becoming increasingly complex and changeable, which puts forward higher requirements for the comprehensive performance of coatings. In particular, the heat insulation and flame retardant capabilities of anti-corrosion coatings have become the focus of attention.

[0003] While traditional anti-corrosion coatings have played a role in preventing metal corrosion and extending equipment lifespan, their shortcomings in heat insulation and flame retardancy have become increasingly apparent in extreme environments such as high temperatures and fires. Under high-temperature conditions, the heat insulation effect of traditional anti-corrosion coatings is limited, failing to effectively prevent heat transfer to the substrate, leading to a rapid rise in substrate temperature, potentially causing safety accidents or accelerating material aging. Simultaneously, in the event of a fire, the insufficient flame retardancy of traditional anti-corrosion coatings fails to effectively prevent the spread of fire, increasing the fire risk.

[0004] In order to improve the overall performance of anti-corrosion coatings, especially their heat insulation and flame retardant capabilities, there is an urgent need to develop a new type of coating. Summary of the Invention

[0005] To improve the heat insulation and flame retardant properties of anti-corrosion coatings, this application provides a heat insulation and flame retardant anti-corrosion coating and its preparation method.

[0006] Firstly, this application provides a heat-insulating, flame-retardant, and anti-corrosion coating, which adopts the following technical solution:

[0007] A heat-insulating, flame-retardant, and corrosion-resistant coating comprises the following raw materials in parts by weight:

[0008] The composition comprises 50-80 parts silicone-acrylic emulsion, 10-15 parts epoxy resin, 30-40 parts heat-insulating microcapsules, 15-21 parts hollow glass microspheres, 3-5 parts dispersant, 0.5-2 parts polypropylene glycol diglycidyl ether, 1-5 parts leveling agent, and 15-20 parts water. The heat-insulating microcapsules include an aluminum powder core and a heat-insulating and flame-retardant capsule wall layer. The capsule wall layer material includes acrylic resin and polyamide resin.

[0009] By adopting the above technical solution, aluminum powder possesses metallic properties, exhibiting not only high reflectivity for infrared rays but also strong reflectivity across the entire spectrum of sunlight. Furthermore, during the drying and curing process of the coating, aluminum powder can be oriented to form a mirror-like surface within the coating, further enhancing the coating's heat insulation capabilities. However, aluminum powder is relatively reactive and easily reacts with oxygen and water in the air, affecting its performance. Therefore, acrylic resin and polyamide resin are used to encapsulate it to form heat-insulating microcapsules. This maintains the strong reflectivity of aluminum powder for infrared rays and sunlight, significantly improving the heat insulation performance of the coating, while effectively preventing the oxidation of aluminum powder, thus improving the stability and flame retardancy of the coating. At the same time, the encapsulation of aluminum powder improves the uniformity of its distribution in the base material, allowing the aluminum powder to be more evenly dispersed in the base material and exert its function.

[0010] During the microcapsule preparation process, electrons on the α-carbon atoms of the methyl group in the acrylic resin can react with surface-active aluminum, allowing the acrylic resin to adhere to the aluminum powder surface and form a coating layer. Further addition of polyamide resin enhances the compatibility between the acrylic resin and epoxy resin. Through the cross-linking action of polyamide, acrylic acid, silicone-acrylic emulsion, and epoxy resin, a three-dimensional network structure is formed, making the coating denser and defect-free, reducing the penetration of flammable gases and oxygen, and further improving the flame-retardant properties of the coating.

[0011] High-temperature resistant epoxy resin is used to prepare epoxy primer with high corrosion resistance and strong adhesion. Epoxy resin and silicone-acrylic emulsion are used as film-forming substances to synergistically construct a robust and corrosion-resistant coating base. The addition of hollow glass microspheres further reduces the thermal conductivity of the coating and enhances the heat insulation effect.

[0012] Optionally, the heat-insulating microcapsules are prepared by the following method:

[0013] (1) Mix aluminum powder with acetone for 20-30 minutes, then ultrasonically disperse for 8-10 minutes, filter and wash, and set aside for later use;

[0014] (2) After dissolving acrylic resin and polyamide resin in ethanol to form a capsule wall layer solution, aluminum powder from step (1) is added and stirred until mixed, and then vacuum spray dried to obtain heat-insulating microcapsules; wherein the mass ratio of acrylic resin to polyamide resin is 1:2-3, and the mass ratio of aluminum powder to capsule wall layer solution is 1:1.2-1.5.

[0015] By adopting the above technical solution, aluminum powder particles can be effectively dispersed in acetone, avoiding agglomeration and clumping between them, making them easier to process in subsequent steps. Furthermore, a chemically bonded film is formed on the surface of the silane coupling agent, improving the compatibility and bonding force between the aluminum powder and the capsule wall resin. The composite use of acrylic resin and polyamide resin forms a capsule wall layer with low thermal conductivity, effectively reducing heat transfer and further improving the flame retardant and heat-resistant properties of the coating.

[0016] Optionally, the stirring speed during the stirring process is 600-800 rpm.

[0017] By adopting the above technical solution, the surface tension of the coating increases during the curing and shrinkage process. The two-dimensional aluminum powder in the polymer matrix tends to be oriented parallel to the substrate as the coating tension increases, thus forming a planar structure parallel to the substrate in the coating, which has stronger reflective properties. Therefore, the basic morphology of aluminum powder is crucial to the infrared reflective performance of the coating. By selecting an appropriate stirring rate, the aluminum powder can be evenly dispersed while ensuring that its morphology is not destroyed and that it is evenly spread in the coating, thereby giving the prepared microcapsules a better heat insulation effect.

[0018] Optionally, the particle size of the aluminum powder is between 10 and 60 μm.

[0019] By adopting the above technical solution and further controlling the particle size of aluminum powder to narrow the particle size distribution range, a uniform particle size distribution is achieved, enhancing the smoothness and consistency of the coating. Aluminum powder particles within this particle size range have a higher specific surface area, enabling the formation of more and denser reflective surfaces within the coating, effectively improving the coating's heat insulation performance. Simultaneously, aluminum powder particles within this particle size range are more likely to achieve directional alignment during the coating curing process. This orderly arrangement further enhances the coating's heat insulation effect, allowing the coating to reach a new level of heat insulation performance.

[0020] Optionally, the heat-insulating microcapsule core also contains antimony-doped tin dioxide, and the ratio of aluminum powder to antimony-doped tin dioxide is 1:0.2-0.4.

[0021] By employing the above-mentioned technical solution, antimony-doped tin dioxide exhibits excellent thermal insulation properties. Combined with the metallic luster and reflective properties of aluminum powder, it can form a microcapsule structure with a dual thermal insulation mechanism. This structure not only enhances the coating's ability to reflect infrared and sunlight but also further blocks heat transfer paths through the inherent thermal insulation properties of antimony-doped tin dioxide. Furthermore, the low coefficient of thermal expansion of antimony-doped tin dioxide plays a crucial role when the coating is heated, helping to maintain its stability and reducing cracking and peeling caused by differences in thermal expansion, thereby further improving the overall flame-retardant effect of the coating.

[0022] Optionally, the dispersant is any one of fatty alcohol polyoxyethylene ether or polycarboxylate dispersant.

[0023] By adopting the above technical solution, the components of the raw materials are evenly dispersed, resulting in a heat-insulating and flame-retardant anti-corrosion coating.

[0024] Optionally, 2-3 parts of potassium methylsilicate are also added to the raw materials.

[0025] By adopting the above technical solution, potassium methylsilicate can react with silicone-acrylic emulsions to form a dense protective film on the coating surface, which can isolate the corrosive medium from the coating substrate, improve the coating's corrosion resistance, and when the coating surface is burned by flame, this protective film can act as a heat insulation barrier, slowing down the transfer of flame and heat into the coating, effectively improving the coating's flame retardant performance.

[0026] Secondly, this application provides a method for preparing a heat-insulating, flame-retardant, and anti-corrosion coating, which adopts the following technical solution: A method for preparing a heat-insulating, flame-retardant, and anti-corrosion coating includes the following preparation steps:

[0027] (1) Hollow glass microspheres and heat-insulating microcapsules were added to silicone-acrylic emulsion and water and dispersed evenly to obtain a mixture;

[0028] (2) Add dispersant, polypropylene glycol diglycidyl ether, epoxy resin and leveling agent to the above mixture and mix evenly to obtain the interior wall insulation coating.

[0029] By adopting the above technical solution, the preparation process is simple, the dispersibility of fillers in the coating is improved, and the components can be fully mixed to obtain an anti-corrosion coating with excellent heat insulation and flame retardant properties.

[0030] In summary, this application has the following beneficial effects:

[0031] 1. This application incorporates heat-insulating microcapsules, in which the aluminum powder core has strong reflectivity to infrared and sunlight, effectively reducing heat absorption. Simultaneously, the capsule wall layer, composed of acrylic resin and polyamide resin, has a low thermal conductivity, further blocking heat transfer paths and protecting the aluminum powder from oxidation and failure. The addition of hollow glass microspheres further reduces the coating's thermal conductivity, enhancing the overall heat insulation effect. These multiple heat insulation mechanisms result in a coating with high heat insulation performance.

[0032] 2. In this application, the epoxy resin and silicone-acrylic emulsion in the coating synergistically construct a robust and corrosion-resistant coating substrate, improving the coating's adhesion and corrosion resistance. The addition of potassium methylsilicate forms a dense protective film on the coating surface, effectively isolating corrosive media from contact with the substrate and further enhancing the coating's corrosion resistance. Simultaneously, this protective film also acts as a heat insulation barrier, slowing heat transfer to the coating's interior at high temperatures and improving the coating's flame retardant properties. Furthermore, the antimony-doped tin dioxide in the heat-insulating microcapsules not only enhances the coating's heat insulation effect but also, due to its low coefficient of thermal expansion, helps maintain the coating's stability, reducing cracks and peeling caused by differences in thermal expansion, thereby further improving the overall flame retardant effect of the coating. Detailed Implementation

[0033] The present application will be further described in detail below with reference to the embodiments.

[0034] Unless otherwise specified in the examples, the procedures should be performed under standard conditions or conditions recommended by the manufacturer. Reagents or instruments whose manufacturers are not specified are all commercially available products.

[0035] The polyamide resin was purchased from Dongguan Jincan Plastic New Materials Co., Ltd., grade 8202C; the epoxy resin was purchased from Langfang Nanze Anticorrosion Materials Co., Ltd., grade E-44; the aluminum powder was purchased from Xinji Guangyuan Metal Powder Co., Ltd.; and the antimony-doped tin dioxide was purchased from Hangzhou Jiupeng New Materials Co., Ltd., model CY-G06, with a particle size of 30nm.

[0036] Preparation examples of raw materials and / or intermediates

[0037] Preparation Example 1

[0038] A heat-insulating microcapsule is prepared by the following steps:

[0039] (1) Mix 50kg of aluminum powder with acetone at a speed of 600rpm for 20min, then ultrasonically disperse for 10min, filter, wash with water, and set aside. The amount of acetone used should be enough to submerge the aluminum powder.

[0040] (2) Acrylic resin and polyamide resin are dissolved in twice the amount of ethanol solution to form a capsule wall layer solution. Aluminum powder from step (1) is added and stirred at a speed of 600 rpm. The mixture is then vacuum spray dried at an inlet air temperature of 40°C, an outlet air temperature of 30°C, and a vacuum degree of -0.09 MPa to obtain heat-insulating microcapsules. The mass ratio of acrylic resin to polyamide resin is 1:2.5, and the mass ratio of aluminum powder to capsule wall layer solution is 1:1.35. The particle size of the aluminum powder is between 10-60 μm.

[0041] Preparation Example 2

[0042] A heat-insulating microcapsule is prepared by the following steps:

[0043] (1) Mix 50kg of aluminum powder with acetone at a speed of 800rpm for 8min, then ultrasonically disperse for 5min, filter, wash with water, and set aside. The amount of acetone used should be enough to submerge the aluminum powder.

[0044] (2) Acrylic resin and polyamide resin are dissolved in twice the amount of ethanol solution to form a capsule wall layer solution. Aluminum powder from step (1) is added and stirred at a speed of 800 rpm. The mixture is then vacuum spray dried at an inlet air temperature of 40°C, an outlet air temperature of 30°C, and a vacuum degree of -0.09 MPa to obtain heat-insulating microcapsules. The mass ratio of acrylic resin to polyamide resin is 1:3, and the mass ratio of aluminum powder to capsule wall layer solution is 1:1.2. The particle size of the aluminum powder is between 10-60 μm.

[0045] Preparation Example 3

[0046] A heat-insulating microcapsule is prepared by the following steps:

[0047] (1) Mix 50kg of aluminum powder with acetone at a speed of 700rpm for 25min, then ultrasonically disperse for 9min, filter, wash with water, and set aside. The amount of acetone used should be enough to submerge the aluminum powder.

[0048] (2) Acrylic resin and polyamide resin are dissolved in twice the amount of ethanol solution to form a capsule wall layer solution. Aluminum powder from step (1) is added and stirred at a rate of 700 rpm. The mixture is then vacuum spray dried at an inlet air temperature of 40°C, an outlet air temperature of 30°C, and a vacuum degree of -0.09 MPa to obtain heat-insulating microcapsules. The mass ratio of acrylic resin to polyamide resin is 1:2, and the mass ratio of aluminum powder to capsule wall layer solution is 1:1.5. The particle size of the aluminum powder is between 10-60 μm.

[0049] Preparation Example 4

[0050] A heat-insulating microcapsule, which differs from Preparation Example 1 in that it is mixed at a stirring rate of 900 rpm for 20 min in this preparation example.

[0051] Preparation Example 5

[0052] A heat-insulating microcapsule, which differs from Preparation Example 1 in that the aluminum powder was stirred and mixed at a rate of 500 rpm for 20 min in this preparation example.

[0053] Preparation Example 6

[0054] A heat-insulating microcapsule, which differs from Preparation Example 1 in that the aluminum powder used in this preparation example has a particle size of 20-100 μm.

[0055] Preparation Example 7

[0056] A heat-insulating microcapsule, differing from Preparation Example 1 in that antimony-doped tin dioxide is also added in this preparation example, and the preparation includes the following steps:

[0057] (1) Mix 50kg of aluminum powder with acetone at a speed of 600rpm for 20min, then ultrasonically disperse for 10min, filter, wash with water, and set aside. The amount of acetone used should be enough to submerge the aluminum powder.

[0058] (2) Acrylic resin and polyamide resin are dissolved in ethanol solution of two times their mass to form a capsule wall layer solution. 10 kg of antimony-doped tin dioxide and aluminum powder from step (1) are added and stirred at a speed of 600 rpm. The mixture is then vacuum spray dried at an inlet air temperature of 40℃, an outlet air temperature of 30℃, and a vacuum degree of -0.09 MPa to obtain heat-insulating microcapsules. The mass ratio of acrylic resin to polyamide resin is 1:2.5, and the mass ratio of aluminum powder to capsule wall layer solution is 1:1.35. The particle size of the aluminum powder is between 10-60 μm.

[0059] Preparation Example 8

[0060] A heat-insulating microcapsule, which differs from Preparation Example 7 in that the ratio of aluminum powder to antimony-doped tin dioxide in this preparation example is 1:0.4.

[0061] Comparative Preparation Example 1

[0062] A heat-insulating microcapsule, which differs from Preparation Example 1 in that the capsule wall layer material in this preparation example is replaced with an equal amount of acrylic resin instead of polyamide resin.

[0063] Comparative Preparation Example 2

[0064] A heat-insulating microcapsule, which differs from Preparation Example 1 in that the capsule wall layer material in this preparation example is replaced with an equal amount of polyamide resin instead of acrylic resin.

[0065] Example

[0066] Example 1

[0067] A heat-insulating, flame-retardant, and corrosion-resistant coating is prepared by the following steps:

[0068] (1) Add 18 kg of hollow glass microspheres and 35 kg of heat insulation microcapsules to 65 kg of silicone acrylic emulsion and 20 kg of water and disperse evenly to obtain a mixture;

[0069] (2) Add 4 kg of fatty alcohol polyoxyethylene ether (dispersant), 1 kg of polypropylene glycol diglycidyl ether, 15 kg of epoxy resin and 2.5 kg of leveling agent 5400 to the above mixture and mix evenly to obtain the interior wall insulation coating; in this embodiment, the heat insulation microcapsules prepared in Preparation Example 1 are used.

[0070] Example 2

[0071] A heat-insulating, flame-retardant, and corrosion-resistant coating is prepared by the following steps:

[0072] (1) Add 21 kg of hollow glass microspheres and 30 kg of heat insulation microcapsules to 80 kg of silicone acrylic emulsion and 20 kg of water and disperse them evenly to obtain a mixture;

[0073] (2) Add 3 kg of fatty alcohol polyoxyethylene ether (dispersant), 2 kg of polypropylene glycol diglycidyl ether, 12.5 kg of epoxy resin and 5 kg of leveling agent 5400 to the above mixture and mix evenly to obtain the interior wall insulation coating; in this embodiment, the heat insulation microcapsules prepared in Preparation Example 2 are used.

[0074] Example 3

[0075] (1) Add 15kg of hollow glass microspheres and 40kg of heat insulation microcapsules to 50kg of silicone acrylic emulsion and 20kg of water and disperse evenly to obtain a mixture;

[0076] (2) Add 5 kg of fatty alcohol polyoxyethylene ether (dispersant), 0.5 kg of polypropylene glycol diglycidyl ether, 10 kg of epoxy resin and 1 kg of leveling agent 5400 to the above mixture and mix evenly to obtain the interior wall insulation coating; in this embodiment, the heat insulation microcapsules prepared in Preparation Example 3 are used.

[0077] Examples 4-8

[0078] A heat-insulating, flame-retardant, and corrosion-resistant coating is prepared according to the method in Example 1, except that the heat-insulating microcapsules added therein are those prepared in Examples 4-8.

[0079] Example 9

[0080] A heat-insulating, flame-retardant, and corrosion-resistant coating, differing from Example 1 in that 2 kg of potassium methylsilicate is added in this example, and the preparation includes the following steps:

[0081] (1) Add 18 kg of hollow glass microspheres and 35 kg of heat insulation microcapsules to 65 kg of silicone acrylic emulsion and 20 kg of water and disperse evenly to obtain a mixture;

[0082] (2) Add 4 kg of fatty alcohol polyoxyethylene ether (dispersant), 1 kg of polypropylene glycol diglycidyl ether, 15 kg of epoxy resin, 2 kg of potassium methylsilicate and 2.5 kg of leveling agent 5400 to the above mixture and mix evenly to obtain the interior wall insulation coating; in this embodiment, the heat insulation microcapsules prepared in Preparation Example 1 are used.

[0083] Example 10

[0084] A heat-insulating, flame-retardant, and corrosion-resistant coating, which differs from Example 9 in that 3 kg of potassium methylsilicate is added in this example.

[0085] Comparative Example

[0086] Comparative Example 1

[0087] A heat-insulating, flame-retardant, and anti-corrosion coating differs from Example 1 in that an equal amount of aluminum powder is used instead of heat-insulating microcapsules in this comparative example.

[0088] Comparative Example 2

[0089] A heat-insulating, flame-retardant, and corrosion-resistant coating, which differs from Example 1 in that the heat-insulating microcapsules added in this comparative example were prepared in Comparative Preparation Example 1.

[0090] Comparative Example 3

[0091] A heat-insulating, flame-retardant, and corrosion-resistant coating, which differs from Example 1 in that the heat-insulating microcapsules added in this comparative example were prepared in Comparative Preparation Example 2.

[0092] Performance testing

[0093] Detection methods / test methods

[0094] Solar reflective heat insulation performance test: The solar reflectivity of the coating is tested according to the standard JC / T 1040-2020 "Heat Reflective Insulation Coatings for Building Exterior Surfaces". The higher the reflectivity, the better the heat insulation performance.

[0095] Flame retardant performance: Oxygen index was tested according to GB / T 8624-2012 "Classification of Burning Performance of Building Materials and Products";

[0096] Thermal conductivity: The thermal conductivity of the coating is obtained according to the ASTM E1530 standard for testing thermal conductivity of coatings.

[0097] Heat resistance: A coating sample with a thickness of 50 μm was prepared by spraying the coating onto a Q235 steel plate using a spray gun. After complete curing, the sample was placed in air for 48 hours. The impact resistance was then tested according to GB / T 1732-2020 "Test Method for Impact Resistance of Paint Film". The sample was then heat-treated in an electric heating constant temperature blower at 120℃. After 3 days, the sample was removed and cooled to room temperature. The impact strength was tested again, and the data were recorded in Table 1. At the same time, it was observed whether the coating showed signs of failure such as rust, bubbles, peeling, chalking, cracking, or discoloration.

[0098] Table 1 Test Results

[0099]

[0100] Based on Examples 1-3 and Comparative Example 1, and in conjunction with Table 1, it can be seen that the test data of Examples 1-3 are all better than those of Comparative Example 1, indicating that the preparation of heat-insulating microcapsules can improve the heat insulation and flame retardant properties of the coating, effectively prevent the oxidation of aluminum powder particles, and improve the stability of the coating performance.

[0101] Based on Examples 1-3 and Comparative Examples 2-3, and in conjunction with Table 1, it can be seen that the experimental data of Examples 1-3 are all superior to those of Comparative Examples 2-3, indicating that the coating layer formed by acrylic resin and polyamide resin has a better ability to block heat and improve the flame retardancy of the coating.

[0102] Combined with Examples 1-5 and Table 1, it can be seen that the experimental data of Examples 1-3 are all better than those of Examples 4-5, indicating that the stirring rate affects the morphology of aluminum powder during the preparation of microcapsules. Controlling the stirring rate between 600-800 rpm allows the aluminum powder to be evenly dispersed while maintaining its morphology, enabling it to spread better in the coating, exert its reflective properties, and improve the heat insulation ability of the coating.

[0103] Combining Examples 1 and 6 with Table 1, it can be seen that the experimental data of Example 1 are better than those of Example 6, indicating that when the aluminum powder particle size range is large and the particle size distribution is good, the experimental data of Examples 7-8 are better than those of Example 1, indicating that adding a small amount of antimony-doped tin dioxide is beneficial to its interaction with aluminum powder. It not only enhances the coating's heat reflection ability, but also utilizes its good heat insulation performance to further block the heat transfer path and improve the coating's heat insulation and flame retardant ability.

[0104] Combining Examples 1 and 9-10 with Table 1, it can be seen that the test data of Examples 9-10 are better than those of Example 1, indicating that the addition of potassium methylsilicate is beneficial to forming a dense protective film on the coating surface, preventing heat transfer to the interior of the coating, thereby improving the flame retardant performance of the coating.

[0105] By placing the coating in an electric thermostatic blower at 120°C for an extended period of time, and then removing it and cooling it to room temperature after 3, 7, 14, and 28 days, the surface of the coating was observed. It was recorded that the coatings prepared in the embodiments of this application did not exhibit any coating failure phenomena such as rusting, bubbling, peeling, chalking, cracking, or discoloration. This indicates that the coatings prepared by the method of this application have good high-temperature resistance and can maintain good performance even in long-term high-temperature environments.

[0106] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A heat-insulating, flame-retardant, and corrosion-resistant coating, characterized in that, Including the following parts by weight of raw materials: The composition comprises 50-80 parts silicone-acrylic emulsion, 10-15 parts epoxy resin, 30-40 parts heat-insulating microcapsules, 15-21 parts hollow glass microspheres, 3-5 parts dispersant, 0.5-2 parts polypropylene glycol diglycidyl ether, 1-5 parts leveling agent, and 15-20 parts water. The heat-insulating microcapsules include an aluminum powder core and a heat-insulating and flame-retardant capsule wall layer. The capsule wall layer material includes acrylic resin and polyamide resin.

2. The heat-insulating, flame-retardant, and anti-corrosion coating according to claim 1, characterized in that: The heat-insulating microcapsules are prepared by the following method: (1) Mix aluminum powder with acetone for 20-30 minutes, then ultrasonically disperse for 8-10 minutes, filter and wash, and set aside for later use; (2) After dissolving acrylic resin and polyamide resin in ethanol to form a capsule wall layer solution, aluminum powder from step (1) is added and stirred until mixed, and then vacuum spray dried to obtain heat-insulating microcapsules; wherein the mass ratio of acrylic resin to polyamide resin is 1:2-3, and the mass ratio of aluminum powder to capsule wall layer solution is 1:1.2-1.

5.

3. The heat-insulating, flame-retardant, and anti-corrosion coating according to claim 2, characterized in that: The stirring speed is 600-800 rpm during the stirring process.

4. The heat-insulating, flame-retardant, and anti-corrosion coating according to claim 1, characterized in that: The particle size of the aluminum powder is between 10 and 60 μm.

5. The heat-insulating, flame-retardant, and anti-corrosion coating according to claim 1, characterized in that: The heat-insulating microcapsule core also contains antimony-doped tin dioxide, and the ratio of aluminum powder to antimony-doped tin dioxide is 1:0.2-0.

4.

6. The heat-insulating, flame-retardant, and anti-corrosion coating according to claim 1, characterized in that: The dispersant is any one of fatty alcohol polyoxyethylene ether or polycarboxylate dispersant.

7. The heat-insulating, flame-retardant, and anti-corrosion coating according to claim 1, characterized in that: The raw materials also contain 2-3 parts of potassium methylsilicate.

8. A method for preparing a heat-insulating, flame-retardant, and anti-corrosion coating according to any one of claims 1-6, characterized in that, The preparation steps include the following: (1) Hollow glass microspheres and heat-insulating microcapsules were added to silicone-acrylic emulsion and water and dispersed evenly to obtain a mixture; (2) Add dispersant, polypropylene glycol diglycidyl ether, epoxy resin and leveling agent to the above mixture and mix evenly to obtain the flame retardant and anti-corrosion coating.

Images