Water-based ceramic particle thermal insulation topcoat for storage tanks and preparation method thereof

Abstract

The present invention discloses a thermal insulation topcoat with water-based ceramic particles for storage tanks and a preparation method thereof, and belongs to the technical field of coating preparation. The topcoat is mainly composed of water-based ceramic particles, modified acrylic emulsion and a variety of additives, and is prepared by a specific stirring, grinding and dispersing process. Compared with the prior art, the coating of the present invention adopts a water-based formula and meets modern environmental protection requirements. In addition, the present invention also optimizes the construction performance and storage stability of the coating, making it easier to construct and store. Through actual application tests, the coating of the present invention forms a uniform and dense coating on the surface of the storage tank, which has excellent heavy-duty anti-corrosion properties while being thermally insulating and energy-saving.

Description

Technical Field

[0001] The invention relates to the technical field of coating preparation, and in particular to a water-based ceramic particle thermal insulation topcoat for a storage tank and a preparation method thereof. Background Art

[0002] With the rapid development of industrialization, storage tanks are increasingly used in the petroleum, chemical, energy and other industries. Thermal insulation treatment of storage tanks is one of the key technologies to ensure that the internal medium remains stable during storage and transportation. Traditional thermal insulation materials, such as foam glass and rock wool, have certain thermal insulation effects, but they have many shortcomings, such as low physical strength, easy water absorption, inconvenient construction, and easy to cause environmental pollution.

[0003] In the field of coatings, although there are many thermal insulation coating products, they often cannot simultaneously meet the requirements of high thermal insulation efficiency, good mechanical properties and excellent durability. In addition, many existing coatings also have limitations in chemical stability and corrosion resistance, making it difficult to adapt to harsh industrial environments and climatic conditions.

[0004] Environmental regulations have increasingly tightened restrictions on volatile organic compound (VOC) emissions, and traditional solvent-based coatings are gradually being phased out due to their high VOC content. Therefore, the development of low-VOC or VOC-free environmentally friendly coatings has become an inevitable trend in the development of the industry. Water-based coatings have gradually become a research hotspot due to their low VOC content, good environmental performance and ease of construction.

[0005] However, water-based coatings also face some challenges in practical applications, such as coating stability, water resistance and chemical resistance, especially in demanding industrial applications. In addition, the thermal insulation and anti-corrosion properties of coatings also need to be further improved to meet the needs of specific application scenarios.

[0006] China's invention patent CN103408823B discloses a high-adhesion, electrostatically conductive water-based reflective thermal insulation coating for chemical storage tanks and its preparation and construction method, which belongs to the field of energy-saving coating technology. The above-mentioned high-adhesion, electrostatically conductive water-based reflective thermal insulation coating for chemical storage tanks includes high-adhesion reflective thermal insulation coating and electrostatically conductive reflective coating; the high-adhesion reflective thermal insulation coating is composed of the following components by weight: hollow glass microbeads, silane coupling agent, emulsion, pigment, filler, reflective powder, first auxiliary agent, cosolvent, water; the electrostatically conductive reflective coating is composed of the following components by weight: surfactant, electrostatically conductive filler, nano titanium dioxide, fluorocarbon emulsion, second auxiliary agent, water. The reflective thermal insulation coating prepared by the invention has high adhesion and good electrostatic conductivity, and also has good thermal insulation and chemical resistance. However, the shortcomings of the reflective thermal insulation coating prepared by the invention are its practical application considerations such as long-term performance stability, thermal insulation, environmental adaptability, and construction cost-effectiveness in actual chemical storage tank applications. Summary of the invention

[0007] In view of the shortcomings of the prior art, the present invention aims to develop a new type of water-based ceramic particle thermal insulation topcoat for storage tanks, which not only has excellent thermal insulation and anti-corrosion properties, but also has good mechanical properties, durability and environmental protection, so as to meet the high requirements of modern industry for storage tank thermal insulation materials.

[0008] In order to achieve the above-mentioned object of the invention, the present invention adopts the following technical solutions:

[0009] A method for preparing a water-based ceramic particle thermal insulation topcoat for a storage tank is as follows, in parts by weight:

[0010] Under stirring at a speed of 30 to 80 rpm, add 20 to 30 parts of water and 4 to 6 parts of pigment into a mixing kettle, add 4 to 6 parts of filler and 2 to 4 parts of water-based ceramic particles, and adjust the stirring speed to 200 to 500 rpm to ensure uniform dispersion; during the stirring process, slowly add 30 to 40 parts of modified acrylic emulsion to ensure sufficient mixing; use 0.3 to 0.5 parts of thickener to adjust the viscosity of the coating; add 0.1 to 0.3 parts of wetting agent, 0.5 to 0.7 parts of defoaming agent, 0.2 to 0.4 parts of leveling agent, 0.05 to 0.2 parts of film-forming aid, and 0.05 to 0.2 parts of anti-settling agent to improve the construction performance and storage stability of the coating; use a sand mill to grind the mixed coating until the fineness reaches 20 to 35 μm; filter to remove impurities to obtain water-based ceramic particle thermal insulation topcoat for storage tanks.

[0011] The pigment is at least one of titanium dioxide and iron oxide.

[0012] The filler is at least one of talcum powder, calcium carbonate, barium sulfate and far-infrared ceramic powder.

[0013] Preferably, the filler is a combination of talcum powder, calcium carbonate and barium sulfate in a mass ratio of 1-3:0.5-2:1-3.

[0014] The water-based ceramic particles are composed of aluminum oxide, zirconium oxide and silicon carbide in a mass ratio of 1-3:0.5-2:0.5-2.

[0015] The thickener is at least one of hydroxyethyl cellulose and carboxymethyl cellulose.

[0016] The defoaming agent is a silicone defoaming agent.

[0017] The preparation method of the modified acrylic emulsion is as follows, in parts by weight:

[0018] S1. Dissolve 25-35 parts of water, 0.5-2 parts of emulsifier, and 0.5-0.7 parts of surfactant in a pre-emulsification kettle at 100-300 rpm under stirring; then add 15-20 parts of acrylic acid, 18-22 parts of ethylene glycol dimethacrylate, 25-35 parts of cyclohexyl methacrylate, 2-4 parts of 2-hydroxyethyl methacrylate, and 1-3 parts of hexafluoroisopropyl methacrylate, and stir at 100-400 rpm for 10-30 minutes to form a pre-emulsion;

[0019] S2, 15-25 parts of water and 0.4-0.6 parts of ammonium persulfate are stirred and dissolved to form an initiator liquid; 20-30 parts of water, the initiator liquid, the pre-emulsion liquid, 5-7 parts of hollow silica microspheres, 0.5-2 parts of 3-[tri(2-methoxyethoxy)silyl]propane-1-amine, and 1-1.5 parts of Mxene powder are mixed in a reaction kettle, and the stirring speed is controlled at 200-500 rpm under a pressure of 0.15-0.3 MPa, the temperature is raised to 75-85° C., the reaction is carried out for 2-5 hours, and then the temperature is kept for 1-3 hours, the temperature is lowered to 30-45° C., and the material is filtered to obtain a modified acrylic emulsion.

[0020] The emulsifier is at least one of nonylphenol polyoxyethylene ether and sodium lauryl sulfate.

[0021] The surfactant is at least one of fatty alcohol polyoxyethylene ether and polyvinyl pyrrolidone.

[0022] In the present invention, the preparation of water-based ceramic particle thermal insulation topcoat for storage tanks involves a variety of substances, each of which has a specific role:

[0023] Water acts as a solvent, used to dissolve and disperse other substances.

[0024] Titanium dioxide, as the main pigment, provides the coating with a white appearance and good hiding power.

[0025] Talc acts as a filler to increase the hardness and durability of the coating.

[0026] Calcium carbonate acts as a filler, reducing costs and increasing the volume and thickness of the coating.

[0027] Barium sulfate acts as a filler to improve the density and wear resistance of the coating.

[0028] Waterborne ceramic particles (alumina, zirconium oxide, silicon carbide) provide thermal insulation while being chemically stable and abrasion resistant.

[0029] Hydroxyethyl cellulose is used as a thickener to adjust the viscosity of the coating and improve construction performance.

[0030] Wetting agents improve the wetting of the coating on the substrate surface, ensuring an even coating.

[0031] Silicone defoamers reduce bubbles generated during the mixing and application of coatings.

[0032] Leveling agents improve the leveling properties of coatings and make the coating surface smoother.

[0033] Coalescents help form a uniform, stable coating.

[0034] Anti-settling agents prevent the pigments and fillers in the paint from settling and maintain the stability of the paint.

[0035] 3-[Tri(2-methoxyethoxy)silyl]propan-1-amine was used as a silane coupling agent to enhance the adhesion between the coating and the substrate.

[0036] MXene powder may act as a reinforcement material to improve the mechanical properties and wear resistance of the coating.

[0037] Hollow silica microspheres act as lightweight fillers, reducing coating density and possibly helping to improve thermal insulation performance.

[0038] Ammonium persulfate acts as an initiator to start and promote the polymerization reaction of the polymer.

[0039] Cyclohexyl methacrylate, as a monomer, participates in the polymerization reaction to form a polymer chain.

[0040] Ethylene glycol dimethacrylate is used as a cross-linking monomer to improve the cross-linking density and mechanical strength of the coating.

[0041] Hexafluoroisopropyl methacrylate may provide special surface properties, such as lower surface energy.

[0042] The role of the modified acrylic emulsion in the present invention is to serve as a key film-forming substance for the water-based ceramic particle thermal insulation topcoat for storage tanks, which is responsible for forming a continuous film layer after the coating is cured. Through specific modifiers and additives, such as 3-[tri(2-methoxyethoxy)silyl]propane-1-amine, the modified acrylic emulsion can provide enhanced adhesion, water resistance and chemical resistance, while giving the coating excellent mechanical properties and durability. In addition, the modified acrylic emulsion also helps to improve the thermal insulation effect of the coating, ensure the uniformity and integrity of the coating on the surface of the tank, thereby improving the protective performance and service life of the overall topcoat.

[0043] The synergistic effect of these substances makes the final water-based ceramic particle thermal insulation topcoat for storage tanks have good thermal insulation properties, excellent corrosion resistance and construction performance.

[0044] Compared with the prior art, it has the following beneficial effects:

[0045] 1) The water-based ceramic particle thermal insulation topcoat for storage tanks of the present invention can effectively block heat transfer and reduce heat exchange inside and outside the storage tank, thereby maintaining the temperature of the medium in the storage tank stable.

[0046] 2) The water-based ceramic particle thermal insulation topcoat for storage tanks of the present invention adjusts the viscosity of the coating by adding hydroxyethyl cellulose, and adds a wetting agent, a defoaming agent, a leveling agent, a film-forming aid and an anti-settling agent. The coating of the present invention exhibits better leveling and anti-settling properties during the construction process, while improving the storage stability of the coating and reducing problems that may occur during the construction process.

[0047] 3) 3-[tri(2-methoxyethoxy)silyl]propane-1-amine and Mxene powder are used in the preparation process of the modified acrylic emulsion in the water-based ceramic particle thermal insulation topcoat for storage tanks of the present invention. These ingredients can enhance the chemical stability and corrosion resistance of the coating, so that the coating can better resist the erosion of harsh environments and chemical media.

[0048] 4) The water-based paint of the present invention is based on water-based acrylic emulsion, which reduces the emission of volatile organic compounds and is more environmentally friendly than traditional solvent-based paints. At the same time, the construction and cleaning process of the water-based paint is simpler, which reduces the construction cost and improves the economic benefit. DETAILED DESCRIPTION

[0049] Main sources of substances:

[0050] Silicone defoamer: Brand BYK-006N, brand BYK from Germany.

[0051] Titanium dioxide:, crystal form: rutile, brand DuPont, grade R931.

[0052] Hydroxyethyl cellulose: Shanghai Aladdin Biochemical Technology Co., Ltd., specification or purity: 100-200mpa.s, 25°C, item number: H104786.

[0053] Anti-settling agent: from Japan Desbaron, AQ-633E.

[0054] Leveling agent: EFKA3600 (fluorocarbon polymer compound) from BASF, Germany.

[0055] Coalescent: Texanol from Eastman.

[0056] The wetting agent is a polyether-modified polysiloxane solution of model BYK-346 produced by German BYK Chemical Company.

[0057] Hollow silica microspheres: Model: pore size 2-3nm, category (specific surface area): 2400m / g.

[0058] Mxene powder: Zhongmingci (Suzhou) Nano Powder Technology Co., Ltd., two-dimensional material multilayer Ti3C2, particle size: 800 mesh, model: ZMC-MX19.

[0059] Fatty alcohol polyoxyethylene ether: Shanghai Aladdin Biochemical Technology Co., Ltd., product number: A304365, Mw 400-500.

[0060] Acrylic emulsion: D-640 emulsion, purchased from DSM.

[0061] The design idea of ​​the present invention is to develop a water-based ceramic particle thermal insulation topcoat for storage tanks that integrates thermal insulation, corrosion resistance, construction convenience and environmental protection performance. By carefully selecting and proportioning ceramic particles with excellent thermal insulation performance, combined with the efficient film-forming characteristics of modified acrylic emulsion, and the synergistic effect of a series of additives, the high performance requirements of the coating are achieved. During the preparation process, specific stirring, grinding and dispersing techniques are used to ensure the uniformity and stability of the coating. At the same time, the design of the water-based formula reduces the emission of volatile organic compounds and meets the requirements of environmental protection regulations. In addition, by optimizing the production process, the coating of the present invention also performs well in construction performance and storage stability, and can be widely used in thermal insulation and protection of equipment such as storage tanks, effectively extending the service life of the equipment and reducing energy consumption.

[0062] Example 1

[0063] A method for preparing a water-based ceramic particle thermal insulation topcoat for a storage tank is as follows:

[0064] Under stirring at a speed of 50rpm, 25kg of water and 5kg of titanium dioxide are added to a mixing kettle, and 2kg of talcum powder, 1kg of calcium carbonate, 2kg of barium sulfate and 3kg of water-based ceramic particles are added. The water-based ceramic particles are composed of aluminum oxide, zirconium oxide and silicon carbide in a mass ratio of 2:1:1. The stirring speed is adjusted to 400rpm to ensure uniform dispersion; during the stirring process, 35kg of modified acrylic emulsion is slowly added to ensure sufficient mixing; 0.4kg of hydroxyethyl cellulose is used to adjust the viscosity of the coating; 0.2kg of wetting agent, 0.6kg of silicone defoamer, 0.3kg of leveling agent, 0.1kg of film-forming aid and 0.1kg of anti-settling agent are added to improve the construction performance and storage stability of the coating; the mixed coating is ground with a sand mill until the fineness reaches 30μm; impurities are filtered to remove them to obtain a water-based ceramic particle thermal insulation topcoat for storage tanks.

[0065] The preparation method of the modified acrylic emulsion is as follows:

[0066] S1, 30kg water, 1kg nonylphenol polyoxyethylene ether, 0.6kg fatty alcohol polyoxyethylene ether were stirred and dissolved in a pre-emulsification kettle at 200rpm; then 18kg acrylic acid, 20kg ethylene glycol dimethacrylate, 30kg cyclohexyl methacrylate, 3kg 2-hydroxyethyl methacrylate, 2kg hexafluoroisopropyl methacrylate were added, and stirred at 300rpm for 20 minutes to form a pre-emulsion;

[0067] S2, 20kg water and 0.5kg ammonium persulfate are stirred and dissolved to form an initiator liquid; 25kg water, initiator liquid, pre-emulsion liquid, 6kg hollow silica microspheres, 1kg 3-[tri(2-methoxyethoxy)silyl]propane-1-amine, and 1.2kg Mxene powder are mixed in a reactor, under a pressure of 0.2MPa, the stirring speed is controlled at 400rpm, the temperature is raised to 80°C, the reaction is carried out for 4 hours, and then the temperature is kept for 2 hours, the temperature is lowered to 40°C, the material is filtered out, and a modified acrylic emulsion is obtained.

[0068] Example 2

[0069] The preparation method of a water-based ceramic particle thermal insulation topcoat for a storage tank is basically the same as that of Example 1, the only difference being that the preparation method of the modified acrylic emulsion is different.

[0070] The preparation method of the modified acrylic emulsion is as follows:

[0071] S1, 30kg water, 1kg nonylphenol polyoxyethylene ether, 0.6kg fatty alcohol polyoxyethylene ether were stirred and dissolved in a pre-emulsification kettle at 200rpm; then 18kg acrylic acid, 20kg glycidyl methacrylate, 30kg cyclohexyl methacrylate, 3kg 2-hydroxyethyl methacrylate, 2kg hexafluoroisopropyl methacrylate were added, and stirred at 300rpm for 20 minutes to form a pre-emulsion;

[0072] S2, 20kg water and 0.5kg ammonium persulfate are stirred and dissolved to form an initiator liquid; 25kg water, initiator liquid, pre-emulsion liquid, 6kg hollow silica microspheres, 1kg 3-[tri(2-methoxyethoxy)silyl]propane-1-amine, and 1.2kg Mxene powder are mixed in a reactor, under a pressure of 0.2MPa, the stirring speed is controlled at 400rpm, the temperature is raised to 80°C, the reaction is carried out for 4 hours, and then the temperature is kept for 2 hours, the temperature is lowered to 40°C, the material is filtered out, and a modified acrylic emulsion is obtained.

[0073] Example 3

[0074] The preparation method of a water-based ceramic particle thermal insulation topcoat for a storage tank is basically the same as that of Example 1, the only difference being that the preparation method of the modified acrylic emulsion is different.

[0075] The preparation method of the modified acrylic emulsion is as follows:

[0076] S1, 30kg water, 1kg nonylphenol polyoxyethylene ether, 0.6kg fatty alcohol polyoxyethylene ether were stirred and dissolved in a pre-emulsification kettle at 200rpm; then 18kg acrylic acid, 20kg 2-(hydroxymethyl) methyl acrylate, 30kg cyclohexyl methacrylate, 3kg 2-hydroxyethyl methacrylate, 2kg hexafluoroisopropyl methacrylate were added, and stirred at 300rpm for 20 minutes to form a pre-emulsion;

[0077] S2, 20kg water and 0.5kg ammonium persulfate are stirred and dissolved to form an initiator liquid; 25kg water, initiator liquid, pre-emulsion liquid, 6kg hollow silica microspheres, 1kg 3-[tri(2-methoxyethoxy)silyl]propane-1-amine, and 1.2kg Mxene powder are mixed in a reactor, under a pressure of 0.2MPa, the stirring speed is controlled at 400rpm, the temperature is raised to 80°C, the reaction is carried out for 4 hours, and then the temperature is kept for 2 hours, the temperature is lowered to 40°C, the material is filtered out, and a modified acrylic emulsion is obtained.

[0078] Example 4

[0079] The preparation method of a water-based ceramic particle thermal insulation topcoat for a storage tank is basically the same as that of Example 1, the only difference being that the preparation method of the modified acrylic emulsion is different.

[0080] The preparation method of the modified acrylic emulsion is as follows:

[0081] S1, 30kg water, 1kg nonylphenol polyoxyethylene ether, 0.6kg fatty alcohol polyoxyethylene ether were stirred and dissolved in a pre-emulsification kettle at 200rpm; then 18kg acrylic acid, 20kg methyl methacrylate, 30kg cyclohexyl methacrylate, 3kg 2-hydroxyethyl methacrylate, 2kg hexafluoroisopropyl methacrylate were added, and stirred at 300rpm for 20 minutes to form a pre-emulsion;

[0082] S2, 20kg water and 0.5kg ammonium persulfate are stirred and dissolved to form an initiator liquid; 25kg water, initiator liquid, pre-emulsion liquid, 6kg hollow silica microspheres, 1kg 3-[tri(2-methoxyethoxy)silyl]propane-1-amine, and 1.2kg Mxene powder are mixed in a reactor, under a pressure of 0.2MPa, the stirring speed is controlled at 400rpm, the temperature is raised to 80°C, the reaction is carried out for 4 hours, and then the temperature is kept for 2 hours, the temperature is lowered to 40°C, the material is filtered out, and a modified acrylic emulsion is obtained.

[0083] Example 5

[0084] The preparation method of a water-based ceramic particle thermal insulation topcoat for a storage tank is basically the same as that of Example 1, the only difference being that the preparation method of the modified acrylic emulsion is different.

[0085] The preparation method of the modified acrylic emulsion is as follows:

[0086] S1, 30kg water, 1kg nonylphenol polyoxyethylene ether, 0.6kg fatty alcohol polyoxyethylene ether were stirred and dissolved in a pre-emulsification kettle at 200rpm; then 18kg acrylic acid, 20kg ethylene glycol dimethacrylate, 30kg 1,4-butanediol diacrylate, 3kg 2-hydroxyethyl methacrylate, 2kg hexafluoroisopropyl methacrylate were added, and stirred at 300rpm for 20 minutes to form a pre-emulsion;

[0087] S2, 20kg water and 0.5kg ammonium persulfate are stirred and dissolved to form an initiator liquid; 25kg water, initiator liquid, pre-emulsion liquid, 6kg hollow silica microspheres, 1kg 3-[tri(2-methoxyethoxy)silyl]propane-1-amine, and 1.2kg Mxene powder are mixed in a reactor, under a pressure of 0.2MPa, the stirring speed is controlled at 400rpm, the temperature is raised to 80°C, the reaction is carried out for 4 hours, and then the temperature is kept for 2 hours, the temperature is lowered to 40°C, the material is filtered out, and a modified acrylic emulsion is obtained.

[0088] Example 6

[0089] The preparation method of a water-based ceramic particle thermal insulation topcoat for a storage tank is basically the same as that of Example 1, the only difference being that the preparation method of the modified acrylic emulsion is different.

[0090] The preparation method of the modified acrylic emulsion is as follows:

[0091] S1, 30kg water, 1kg nonylphenol polyoxyethylene ether, 0.6kg fatty alcohol polyoxyethylene ether were stirred and dissolved in a pre-emulsification kettle at 200rpm; then 18kg acrylic acid, 50kg ethylene glycol dimethacrylate, 3kg 2-hydroxyethyl methacrylate, 2kg hexafluoroisopropyl methacrylate were added, and stirred at 300rpm for 20 minutes to form a pre-emulsion;

[0092] S2, 20kg water and 0.5kg ammonium persulfate are stirred and dissolved to form an initiator liquid; 25kg water, initiator liquid, pre-emulsion liquid, 6kg hollow silica microspheres, 1kg 3-[tri(2-methoxyethoxy)silyl]propane-1-amine, and 1.2kg Mxene powder are mixed in a reactor, under a pressure of 0.2MPa, the stirring speed is controlled at 400rpm, the temperature is raised to 80°C, the reaction is carried out for 4 hours, and then the temperature is kept for 2 hours, the temperature is lowered to 40°C, the material is filtered out, and a modified acrylic emulsion is obtained.

[0093] Example 7

[0094] The preparation method of a water-based ceramic particle thermal insulation topcoat for a storage tank is basically the same as that of Example 1, the only difference being that the preparation method of the modified acrylic emulsion is different.

[0095] The preparation method of the modified acrylic emulsion is as follows:

[0096] S1, 30kg water, 1kg nonylphenol polyoxyethylene ether, 0.6kg fatty alcohol polyoxyethylene ether were stirred and dissolved in a pre-emulsification kettle at 200rpm; then 18kg acrylic acid, 50kg 1,4-butanediol diacrylate, 3kg 2-hydroxyethyl methacrylate, 2kg hexafluoroisopropyl methacrylate were added, and stirred at 300rpm for 20 minutes to form a pre-emulsion;

[0097] S2, 20kg water and 0.5kg ammonium persulfate are stirred and dissolved to form an initiator liquid; 25kg water, initiator liquid, pre-emulsion liquid, 6kg hollow silica microspheres, 1kg 3-[tri(2-methoxyethoxy)silyl]propane-1-amine, and 1.2kg Mxene powder are mixed in a reactor, under a pressure of 0.2MPa, the stirring speed is controlled at 400rpm, the temperature is raised to 80°C, the reaction is carried out for 4 hours, and then the temperature is kept for 2 hours, the temperature is lowered to 40°C, the material is filtered out, and a modified acrylic emulsion is obtained.

[0098] Example 8

[0099] The preparation method of a water-based ceramic particle thermal insulation topcoat for a storage tank is basically the same as that of Example 1, the only difference being that the preparation method of the modified acrylic emulsion is different.

[0100] The preparation method of the modified acrylic emulsion is as follows:

[0101] S1, 30kg water, 1kg nonylphenol polyoxyethylene ether, 0.6kg fatty alcohol polyoxyethylene ether were stirred and dissolved in a pre-emulsification kettle at 200rpm; then 18kg acrylic acid, 20kg ethylene glycol dimethacrylate, 30kg butyl acrylate, 3kg 2-hydroxyethyl methacrylate, 2kg hexafluoroisopropyl methacrylate were added, and stirred at 300rpm for 20 minutes to form a pre-emulsion;

[0102] S2, 20kg water and 0.5kg ammonium persulfate are stirred and dissolved to form an initiator liquid; 25kg water, initiator liquid, pre-emulsion liquid, 6kg hollow silica microspheres, 1kg 3-[tri(2-methoxyethoxy)silyl]propane-1-amine, and 1.2kg Mxene powder are mixed in a reactor, under a pressure of 0.2MPa, the stirring speed is controlled at 400rpm, the temperature is raised to 80°C, the reaction is carried out for 4 hours, and then the temperature is kept for 2 hours, the temperature is lowered to 40°C, the material is filtered out, and a modified acrylic emulsion is obtained.

[0103] Example 9

[0104] The preparation method of a water-based ceramic particle thermal insulation topcoat for a storage tank is basically the same as that of Example 1, the only difference being that the preparation method of the modified acrylic emulsion is different.

[0105] The preparation method of the modified acrylic emulsion is as follows:

[0106] S1, 30kg water, 1kg nonylphenol polyoxyethylene ether, 0.6kg fatty alcohol polyoxyethylene ether were stirred and dissolved in a pre-emulsification kettle at 200rpm; then 18kg acrylic acid, 20kg ethylene glycol dimethacrylate, 30kg cyclohexyl methacrylate, 3kg 2-hydroxyethyl methacrylate, 2kg trifluoroethyl acrylate were added, and stirred at 300rpm for 20 minutes to form a pre-emulsion;

[0107] S2, 20kg water and 0.5kg ammonium persulfate are stirred and dissolved to form an initiator liquid; 25kg water, initiator liquid, pre-emulsion liquid, 6kg hollow silica microspheres, 1kg 3-[tri(2-methoxyethoxy)silyl]propane-1-amine, and 1.2kg Mxene powder are mixed in a reactor, under a pressure of 0.2MPa, the stirring speed is controlled at 400rpm, the temperature is raised to 80°C, the reaction is carried out for 4 hours, and then the temperature is kept for 2 hours, the temperature is lowered to 40°C, the material is filtered out, and a modified acrylic emulsion is obtained.

[0108] Example 10

[0109] The preparation method of a water-based ceramic particle thermal insulation topcoat for a storage tank is basically the same as that of Example 1, the only difference being that the preparation method of the modified acrylic emulsion is different.

[0110] The preparation method of the modified acrylic emulsion is as follows:

[0111] S1, 30kg water, 1kg nonylphenol polyoxyethylene ether, 0.6kg fatty alcohol polyoxyethylene ether were stirred and dissolved in a pre-emulsification kettle at 200rpm; then 18kg acrylic acid, 20kg ethylene glycol dimethacrylate, 30kg cyclohexyl methacrylate, 3kg 2-hydroxyethyl methacrylate, 2kg hexafluoroisopropyl methacrylate were added, and stirred at 300rpm for 20 minutes to form a pre-emulsion;

[0112] S2, 20kg water and 0.5kg ammonium persulfate were stirred and dissolved to form an initiator liquid; 25kg water, initiator liquid, pre-emulsion liquid, 6kg hollow silica microspheres, 1kg 3-aminopropyltriethoxysilane, and 1.2kg Mxene powder were mixed in a reactor, and the stirring speed was controlled at 400rpm under a pressure of 0.2MPa, the temperature was raised to 80°C, the reaction was carried out for 4 hours, and then the temperature was kept for 2 hours, the temperature was lowered to 40°C, and the material was filtered to obtain a modified acrylic emulsion.

[0113] Embodiment 11

[0114] The preparation method of a water-based ceramic particle thermal insulation topcoat for a storage tank is basically the same as that of Example 1, the only difference being that the preparation method of the modified acrylic emulsion is different.

[0115] The preparation method of the modified acrylic emulsion is as follows:

[0116] S1, 30kg water, 1kg nonylphenol polyoxyethylene ether, 0.6kg fatty alcohol polyoxyethylene ether were stirred and dissolved in a pre-emulsification kettle at 200rpm; then 18kg acrylic acid, 20kg ethylene glycol dimethacrylate, 30kg cyclohexyl methacrylate, 3kg 2-hydroxyethyl methacrylate, 2kg hexafluoroisopropyl methacrylate were added, and stirred at 300rpm for 20 minutes to form a pre-emulsion;

[0117] S2, 20kg water and 0.5kg ammonium persulfate are stirred and dissolved to form an initiator liquid; 25kg water, initiator liquid, pre-emulsion liquid, 6kg hollow silica microspheres, 1kg 3-glycidyloxypropyltriethoxysilane, and 1.2kg Mxene powder are mixed in a reactor, under a pressure of 0.2MPa, the stirring speed is controlled at 400rpm, the temperature is raised to 80°C, the reaction is carried out for 4 hours, and then the temperature is kept for 2 hours, the temperature is lowered to 40°C, the material is filtered out, and a modified acrylic emulsion is obtained.

[0118] Example 12

[0119] The preparation method of a water-based ceramic particle thermal insulation topcoat for a storage tank is basically the same as that of Example 1, the only difference being that the preparation method of the modified acrylic emulsion is different.

[0120] The preparation method of the modified acrylic emulsion is as follows:

[0121] S1, 30kg water, 1kg nonylphenol polyoxyethylene ether, 0.6kg fatty alcohol polyoxyethylene ether were stirred and dissolved in a pre-emulsification kettle at 200rpm; then 18kg acrylic acid, 20kg ethylene glycol dimethacrylate, 30kg cyclohexyl methacrylate, 3kg 2-hydroxyethyl methacrylate, 2kg hexafluoroisopropyl methacrylate were added, and stirred at 300rpm for 20 minutes to form a pre-emulsion;

[0122] S2, 20kg of water and 0.5kg of ammonium persulfate are stirred and dissolved to form an initiator liquid; 25kg of water, the initiator liquid, the pre-emulsified liquid, 6kg of hollow silica microspheres, 1kg of 3-(2,3-epoxypropoxy)propyltrimethoxysilane, and 1.2kg of Mxene powder are mixed in a reactor, and under a pressure of 0.2MPa, the stirring speed is controlled at 400rpm, the temperature is raised to 80°C, the reaction is carried out for 4 hours, and then the temperature is kept for 2 hours, the temperature is lowered to 40°C, the material is filtered out, and a modified acrylic emulsion is obtained.

[0123] Comparative Example 1

[0124] A method for preparing a water-based ceramic particle thermal insulation topcoat for a storage tank is as follows:

[0125] Under stirring at a speed of 50rpm, 25kg of water and 5kg of titanium dioxide are added to a mixing kettle, and 2kg of talcum powder, 1kg of calcium carbonate, 2kg of barium sulfate and 3kg of water-based ceramic particles are added. The water-based ceramic particles are composed of aluminum oxide, zirconium oxide and silicon carbide in a mass ratio of 2:1:1. The stirring speed is adjusted to 400rpm to ensure uniform dispersion; during the stirring process, 35kg of acrylic emulsion is slowly added to ensure sufficient mixing; 0.4kg of hydroxyethyl cellulose is used to adjust the viscosity of the coating; 0.2kg of wetting agent, 0.6kg of silicone defoamer, 0.3kg of leveling agent, 0.1kg of film-forming aid and 0.1kg of anti-settling agent are added to improve the construction performance and storage stability of the coating; the mixed coating is ground with a sand mill until the fineness reaches 30μm; impurities are filtered to remove them to obtain a water-based ceramic particle thermal insulation topcoat for storage tanks.

[0126] Test Example 1

[0127] Thermal insulation performance

[0128] The water-based ceramic particle thermal insulation topcoat for storage tanks prepared in the examples of the present invention and the comparative examples was tested for thermal insulation temperature difference according to JC / T235-2014. Each group was tested 3 times and the average value was taken; the test results are shown in Table 1.

[0129] Table 1

[0130]

[0131]

[0132] Test Example 2

[0133] Corrosion resistance

[0134] Acid resistance: Refer to the method in GB / T50393-2017 "Technical Standard for Anti-corrosion Engineering of Steel Petroleum Storage Tanks" to test and observe the bubbling time. The test parameters are: 5wt% H2SO4 solution, and observe how long it takes for no bubbling, rusting, falling off, or cracking;

[0135] Alkali resistance: refer to the method in GB / T50393-2017 "Technical Standard for Anti-corrosion Engineering of Steel Petroleum Storage Tanks" to test and observe the bubbling time. The test parameters are: 5wt% NaOH solution, and observe how long it takes for no bubbling, rusting, falling off, or cracking;

[0136] Salt water resistance: Refer to the method in standard GB / T50393-2017 "Technical Standard for Anti-corrosion Engineering of Steel Petroleum Storage Tanks" for testing, observe the bubbling time, the test parameters are: 5wt% NaCl solution, observe how long it takes without bubbling, rusting, falling off, and cracking.

[0137] The test results are shown in Table 2.

[0138] Table 2

[0139] Experimental protocol Acid resistance (h) Alkali resistance (h) Salt water resistance (h) Example 1 ＞380 ＞349 ＞361 Example 2 ＞376 ＞345 ＞360 Example 3 ＞371 ＞344 ＞358 Example 4 ＞370 ＞341 ＞352 Example 5 ＞389 ＞358 ＞365 Example 6 ＞370 ＞351 ＞359 Example 7 ＞369 ＞348 ＞354 Example 8 ＞372 ＞340 ＞352 Example 9 ＞368 ＞342 ＞354 Example 10 ＞378 ＞346 ＞361 Embodiment 11 ＞377 ＞345 ＞359 Example 12 ＞374 ＞342 ＞358 Comparative Example 1 ＞324 ＞301 ＞311

[0140] It can be seen from test examples 1 to 2 that the water-based ceramic particle thermal insulation topcoat for storage tanks obtained in Example 5 of the present invention has good thermal insulation and strong corrosion resistance.

[0141] Compared with other monomers used in Examples 2, 3 and 4, the ethylene glycol dimethacrylate used in Example 1 has a longer carbon chain and more functional groups, which enables it to form a more complex and stable network structure during the polymerization process. This structural feature of ethylene glycol dimethacrylate provides it with a higher crosslinking density, thereby enhancing the cohesion and mechanical strength of the coating. At the same time, the longer carbon chain also increases the flexibility of the coating, helps to improve the adhesion of the coating to the substrate, and reduces cracking caused by temperature changes or mechanical stress, which is beneficial to improving the thermal insulation and corrosion resistance of the coating. On the whole, the unique molecular structure and functional group characteristics of ethylene glycol dimethacrylate form a modified acrylic emulsion with excellent physical and chemical properties in the polymerization reaction, which then shows better thermal insulation effect and stronger corrosion resistance in the final water-based ceramic microparticle thermal insulation topcoat.

[0142] 1,4-Butanediol diacrylate is a monomer with two acrylate functional groups. The 1,4-butanediol skeleton in its molecular structure provides two reaction centers, which enables more crosslinking points to form during the polymerization process. This high crosslinking density helps to improve the mechanical strength and chemical stability of the coating, thereby enhancing corrosion resistance.

[0143] The compound use of ethylene glycol dimethacrylate and 1,4-butanediol diacrylate used in Example 5 provides unique properties of modified acrylic emulsion compared to the monomers used alone in Examples 6 and 7, thereby enhancing the thermal insulation and corrosion resistance of the final coating. Ethylene glycol dimethacrylate is a monomer with two methacrylate functional groups that can provide a higher crosslinking density, enhance the mechanical strength of the coating and the ability to resist chemical media corrosion. Its longer carbon chain also helps to improve the flexibility of the coating and its adhesion to the substrate. 1,4-Butanediol diacrylate is also a difunctional monomer, and its addition further increases the crosslinking points of the polymer network, thereby improving the water resistance and chemical resistance of the coating. In addition, the molecular structure of 1,4-butanediol diacrylate may help to form more stable emulsion particles because its longer carbon chain may promote a more uniform polymerization reaction. In addition, the use of such a compound monomer may also help optimize the microstructure of the coating film, such as reducing the porosity in the coating film, thereby reducing the penetration of heat and corrosive media, and further improving the thermal insulation and anti-corrosion properties. Therefore, the comprehensive performance of Example 5 is better than that of the example using a single monomer.

[0144] The main difference between the preparation methods of Example 1 and Example 9 is the different types of fluorine-containing monomers used. Hexafluoroisopropyl methacrylate is used in Example 1, while trifluoroethyl acrylate is used in Example 9. Hexafluoroisopropyl methacrylate contains six fluorine atoms, while trifluoroethyl acrylate contains only three fluorine atoms. The high electronegativity of fluorine atoms can enhance the chemical resistance and thermal stability of the polymer because fluorine atoms can form strong CF bonds, which makes the coating more stable and more resistant to erosion by corrosive media. In addition, the introduction of fluorine atoms also helps to improve the non-stickiness of the coating and reduce the surface energy, which helps to improve the wear resistance and anti-fouling properties of the coating.

[0145] Compared with other embodiments, Example 1 uses 3-[tri(2-methoxyethoxy)silyl]propan-1-amine in the preparation process of the modified acrylic emulsion, while Examples 10, 11 and 12 use 3-aminopropyltriethoxysilane, 3-glycidyloxypropyltriethoxysilane and 3-(2,3-epoxypropoxy)propyltrimethoxysilane, respectively. 3-[tri(2-methoxyethoxy)silyl]propan-1-amine has a longer chain segment, and this structure provides better flexibility and compatibility with inorganic fillers in terms of intermolecular forces. The long chain structure of this coupling agent helps to form more stable emulsion particles, enhancing the mechanical properties and durability of the coating. At the same time, the longer alkoxy chain can improve the water resistance and chemical medium erosion resistance of the coating, thereby enhancing the corrosion resistance. In addition, the amino group in 3-[tri(2-methoxyethoxy)silyl]propane-1-amine can form hydrogen bonds with other groups in the coating, which helps to improve the cohesion and adhesion of the coating, and further improves the thermal insulation and corrosion resistance. Although the silane coupling agents used in other embodiments also have a certain coupling effect, they may not be as good as 3-[tri(2-methoxyethoxy)silyl]propane-1-amine in terms of intermolecular forces and compatibility with inorganic fillers, and therefore are not as good as Example 1 in terms of thermal insulation and corrosion resistance.

Claims

1. A method for preparing a water-based ceramic particle thermal insulation topcoat for a storage tank, characterized in that: The method is as follows, in parts by weight: Under stirring at 30-80 rpm, add 20-30 parts of water and 4-6 parts of pigment into a mixing kettle, add 4-6 parts of filler and 2-4 parts of water-based ceramic particles, and adjust the stirring speed to 200-500 rpm to ensure uniform dispersion; During the stirring process, slowly add 30-40 parts of modified acrylic emulsion to ensure thorough mixing; Use 0.3-0.5 parts of thickener to adjust the viscosity of the coating; add 0.1-0.3 parts of wetting agent, 0.5-0.7 parts of defoamer, 0.2-0.4 parts of leveling agent, 0.05-0.2 parts of film-forming aid, and 0.05-0.2 parts of anti-settling agent to improve the construction performance and storage stability of the coating; use a sand mill to grind the mixed coating until the fineness reaches 20-35 μm; filter to remove impurities to obtain water-based ceramic particle thermal insulation topcoat for storage tanks; The preparation method of the modified acrylic emulsion is as follows, in parts by weight: S1. Dissolve 25-35 parts of water, 0.5-2 parts of emulsifier, and 0.5-0.7 parts of surfactant in a pre-emulsification kettle at 100-300 rpm under stirring; then add 15-20 parts of acrylic acid, 18-22 parts of ethylene glycol dimethacrylate, 25-35 parts of cyclohexyl methacrylate, 2-4 parts of 2-hydroxyethyl methacrylate, and 1-3 parts of hexafluoroisopropyl methacrylate, and stir at 100-400 rpm for 10-30 minutes to form a pre-emulsion; S2, 15-25 parts of water and 0.4-0.6 parts of ammonium persulfate are stirred and dissolved to form an initiator liquid; 20-30 parts of water, the initiator liquid, the pre-emulsion liquid, 5-7 parts of hollow silica microspheres, 0.5-2 parts of 3-[tri(2-methoxyethoxy)silyl]propane-1-amine, and 1-1.5 parts of Mxene powder are mixed in a reaction kettle, and the stirring speed is controlled at 200-500 rpm under a pressure of 0.15-0.3 MPa, the temperature is raised to 75-85° C., the reaction is carried out for 2-5 hours, and then the temperature is kept for 1-3 hours, the temperature is lowered to 30-45° C., and the material is filtered to obtain a modified acrylic emulsion.

2. The method for preparing the water-based ceramic particle thermal insulation topcoat for storage tanks according to claim 1, characterized in that: The pigment is at least one of titanium dioxide and iron oxide.

3. The method for preparing the water-based ceramic particle thermal insulation topcoat for storage tanks according to claim 1, characterized in that: The filler is at least one of talcum powder, calcium carbonate, barium sulfate and far-infrared ceramic powder.

4. The method for preparing the water-based ceramic particle thermal insulation topcoat for storage tanks according to claim 1, characterized in that: The water-based ceramic particles are composed of aluminum oxide, zirconium oxide and silicon carbide in a mass ratio of 1-3:0.5-2:0.5-2.

5. The method for preparing the water-based ceramic particle thermal insulation topcoat for storage tanks according to claim 1, characterized in that: The thickener is at least one of hydroxyethyl cellulose and carboxymethyl cellulose.

6. The method for preparing the water-based ceramic particle thermal insulation topcoat for storage tanks according to claim 1, characterized in that: The defoaming agent is a silicone defoaming agent.

7. The method for preparing the water-based ceramic particle thermal insulation topcoat for storage tanks according to claim 1, characterized in that: The emulsifier is at least one of nonylphenol polyoxyethylene ether and sodium lauryl sulfate.

8. The method for preparing the water-based ceramic particle thermal insulation topcoat for storage tanks according to claim 1, characterized in that: The surfactant is at least one of fatty alcohol polyoxyethylene ether and polyvinyl pyrrolidone.

9. A water-based ceramic particle thermal insulation topcoat for storage tanks, characterized in that: The method is prepared according to any one of claims 1 to 8.

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