Reflective thermal insulation coating and preparation method thereof, and coating and preparation method thereof

Abstract

The invention discloses a reflective thermal insulation coating and a preparation method thereof, and a coating and a preparation method thereof. The reflective thermal insulation coating comprises a primer component, an intermediate paint component and a finish paint component, the primer component is prepared from the following components in parts by weight: 30 to 40 parts of water-based resin, 10 to 20 parts of flaky CeO2 and 1 to 6 parts of LaPO4; wherein the particle size D50 of the flaky CeO2 is 1-5 [mu] m, and the thickness of the flaky CeO2 is less than 100 nm; the intermediate paint component comprises the following components in parts by weight: 25-35 parts of water-based resin and 15-25 parts of LaxCe (1-x) O (2-0.5 x) hollow microspheres; wherein x ranges from 0 to 0.5; and the finish paint comprises the following components in parts by weight: 25-35 parts of water-based resin, 4-9 parts of LaBO3 and 1-6 parts of LaPO4. The reflective heat insulation coating has excellent sunlight reflection performance and heat insulation performance.

Description

Technical Field

[0001] This invention relates to a reflective heat-insulating coating and its preparation method, as well as a coating and its preparation method. Background Technology

[0002] Continuous exposure to sunlight causes energy buildup and temperature increases on and within objects, leading to increased energy consumption and carbon emissions associated with cooling. Solar radiation consists mostly of visible light (wavelengths approximately 400–760 nm) and near-infrared light (wavelengths approximately 760–2500 nm). Reflective heat-insulating coatings can cool object surfaces by reflecting solar radiation in the 400–2500 nm wavelength range, effectively reflecting, shielding, and blocking solar heat. These coatings can be used on surfaces such as petrochemical storage tanks, grain warehouses, ships, vehicles, buildings, and residences.

[0003] CN120059571A discloses a water-based heat-insulating coating, comprising 15-25 wt% pigment, 35-45 wt% resin, 15-25 wt% solvent, and 5-10 wt% additives; the pigment includes CeO2, Ce2O3, La2O3, SiO2, and TiO2, with a molar ratio of 200:200:400:1:400; the resin includes water-based acrylic resin, water-based alkyd resin, water-based polyurethane resin, water-based amino resin HM2608, and water-based amino resin MF 904; the additives include defoamer SURFYNOL 104E, defoamer 2400, defoamer 21649, leveling agent BYK 333, light stabilizer EVERSORB 93, and ultraviolet absorber EVERSORB. 80. Pigment dispersant PF152, organosilicon surfactant, and aqueous thickener solution 1130; the solvents include N,N-dimethylethanolamine aqueous solution, ethylene glycol hexyl ether, propylene glycol butyl ether, and ethylene glycol monobutyl ether. The reflective and heat-insulating effects of this coating need to be improved.

[0004] CN119391255A discloses a water-based thermal insulation material, comprising 50-55 parts of a water-based hollow elastic rubber microsphere modified silicone-acrylic emulsion, 12-15 parts of modified hollow glass microspheres, 7-9 parts of a rare earth nano-insulating agent, 12-14 parts of a nano-TiO2 modified aerogel dispersion, 6-8 parts of kaolin, 0.5-0.8 parts of a thickener, 0.5-0.7 parts of a dispersant, 1.5-2 parts of a film-forming agent, 1.4-1.6 parts of a defoamer, and 10-12 parts of deionized water. The rare earth nano-insulating agent is an water-based dispersion slurry of cerium-based rare earth oxides. The thermal insulation effect of this coating is relatively poor.

[0005] CN117447881A discloses a reflective heat-insulating coating comprising the following components by mass percentage: 18-30% water, 6-20% titanium dioxide, 1-20% silica aerogel slurry, 1-10% first functional filler, 1-10% second functional filler, 35-45% emulsion, 0-2% plasticizer, 1-2% thickener, 1-2% dispersant, 1-2% wetting agent, 1-2% leveling agent, and 1-2% defoamer. The first functional filler is a mixture of rutile titanium dioxide and rare earth oxides; the second functional filler is microparticles with a particle size distribution; the microparticles are made of porous silica, silicon nitride, silicon carbide, zinc oxide, calcium carbonate, or barium sulfate. The heat insulation effect of this coating needs improvement. Summary of the Invention

[0006] One object of the present invention is to provide a reflective heat-insulating coating that has excellent solar reflectivity and heat insulation properties. Another object of the present invention is to provide a method for preparing the reflective heat-insulating coating. A further object of the present invention is to provide a coating that has excellent solar reflectivity and heat insulation properties. Yet another object of the present invention is to provide a method for preparing the coating.

[0007] The above objectives are achieved through the following technical solutions.

[0008] On one hand, the present invention provides a reflective heat-insulating coating, comprising a primer component, a middle coat component, and a topcoat component; The primer components include 30-40 parts by weight of waterborne resin, 10-20 parts by weight of flake CeO2, and 1-6 parts by weight of LaPO4; wherein the particle size D of the flake CeO2 is... 50 The thickness is 1–5 μm and less than 100 nm. The intermediate paint component includes 25-35 parts by weight of water-based resin and 15-25 parts by weight of La. x Ce (1-x) O (2-0.5x) Hollow microspheres; where x is 0 to 0.5; The topcoat components include 25-35 parts by weight of waterborne resin, 4-9 parts by weight of LaBO3 and 1-6 parts by weight of LaPO4.

[0009] According to the reflective heat-insulating coating of the present invention, preferably, the LaPO4 has a monazite structure, and the particle size D of the LaPO4 is... 50 Its thickness ranges from 0.3 to 1.5 μm. The particle size D of the hollow microspheres 50 The hollow microspheres have a diameter of 13–28 μm, a wall thickness of 80–175 nm, and a bulk density of 1.1–1.7 g / cm³. 3 .

[0010] In the reflective heat-insulating coating of the present invention, preferably, the water-based resin is selected from one or more of acrylic resin, fluorocarbon resin, and silicone-acrylic resin.

[0011] According to the reflective heat-insulating coating of the present invention, preferably, the primer component further includes 6-15 parts by weight of kaolin, 2-7 parts by weight of barium sulfate and 5-12 parts by weight of heavy calcium carbonate; The medium paint component also includes 3-17 parts by weight of kaolin, 1-7 parts by weight of barium sulfate and 5-15 parts by weight of heavy calcium carbonate; The topcoat components also include 3-27 parts by weight of kaolin, 3-10 parts by weight of barium sulfate and 3-25 parts by weight of heavy calcium carbonate.

[0012] According to the reflective heat-insulating coating of the present invention, preferably, the primer components further include one or more of the following: dispersant, wetting agent, defoamer, leveling agent, film-forming agent, anti-settling agent, pH adjuster, and water; The medium paint components also include dispersants, wetting agents, defoamers, leveling agents, film-forming agents, anti-settling agents, pH adjusters, and one or more of the following in water: The topcoat components also include one or more of the following: dispersant, wetting agent, defoamer, leveling agent, film-forming agent, anti-settling agent, pH adjuster, and water.

[0013] According to the reflective heat-insulating coating of the present invention, preferably, the dispersant is BYK-190, the wetting agent is BYK-199, the defoamer is BYK093, the leveling agent is BYK349, the film-forming agent is an aliphatic ester compound containing hydroxyl substituents, the anti-settling agent is BYK420, and the pH adjuster is AMP-95.

[0014] On the other hand, the present invention provides a method for preparing the above-mentioned reflective heat-insulating coating, comprising the following steps: (1) Mix raw materials including water-based resin, flake CeO2 and LaPO4 to obtain primer components; (2) Including water-based resin and La x Ce (1-x) O (2-0.5x) The raw materials for hollow microspheres are mixed to obtain the intermediate paint component; (3) Mix the raw materials including water-based resin, LaBO3 and LaPO4 to obtain the topcoat component.

[0015] In another aspect, the present invention provides a coating comprising a primer layer, a middle coat layer, and a topcoat layer; The primer layer is formed from the primer components in the above-mentioned reflective heat-insulating coating; The intermediate paint layer is formed from the intermediate paint component in the above-mentioned reflective heat-insulating coating; The topcoat layer is formed from the topcoat components of the aforementioned reflective heat-insulating coating.

[0016] According to the coating of the present invention, preferably, the thickness of the primer layer is 80-150 μm, the thickness of the intermediate coat layer is 80-150 μm, and the thickness of the topcoat layer is 80-120 μm.

[0017] In another aspect, the present invention provides a method for preparing a coating, comprising the following steps: The above-mentioned primer components are applied to the surface of the substrate, and after drying, a primer layer is formed on the surface of the substrate; the above-mentioned intermediate paint components are applied to the surface of the primer layer, and after drying, an intermediate paint layer is formed on the surface of the primer layer; the above-mentioned topcoat components are applied to the surface of the intermediate paint layer, and after drying, a topcoat layer is formed on the surface of the intermediate paint layer.

[0018] The reflective heat-insulating coating of the present invention uses primer, intermediate paint and topcoat components with specific compositions in combination, so that the reflective heat-insulating coating has excellent reflective properties for sunlight, especially near-infrared light, and excellent heat insulation properties. Attached Figure Description

[0019] Figure 1 SEM image of the sheet-like CeO2 obtained in Preparation Example 1. Detailed Implementation

[0020] The present invention will be further described below with reference to specific embodiments, but the scope of protection of the present invention is not limited thereto.

[0021] Reflective heat insulation coating The reflective heat-insulating coating of the present invention comprises a primer component, a middle coat component, and a topcoat component. In some embodiments, the reflective heat-insulating coating is composed of a primer component, a middle coat component, and a topcoat component. The three components are independent of each other and do not mix. Each component is described in detail below.

[0022] primer components The primer components include an aqueous resin, flake CeO2, and LaPO4. In some embodiments, the primer components further include kaolin, barium sulfate, and heavy calcium carbonate. Further, the primer components may also include one or more of a dispersant, wetting agent, defoamer, leveling agent, film-forming agent, anti-settling agent, pH adjuster, and water. Preferably, the primer components consist of the aforementioned components.

[0023] The waterborne resin can be selected from one or more of acrylic resin, fluorocarbon resin, and silicone-acrylic resin. The acrylic resin can be designated RS927, produced by the BADF Group. The silicone-acrylic resin can be designated RS-3799A, produced by the BADF Group. The fluorocarbon resin can be designated HLR-WR01, produced by Shandong Huafu Chemical Co., Ltd. The content of the waterborne resin is 30-40 parts by weight; preferably 33-38 parts by weight; more preferably 35-36 parts by weight.

[0024] The particle size D of plate-like CeO2 50 The thickness is 1–5 μm; preferably 1–3 μm; more preferably 1–2 μm. The thickness of the flake-like CeO2 is less than 100 nm; preferably 30–70 nm; more preferably 50–60 nm. The flake-like CeO2 of the present invention is in the form of flakes, and when applied to the coatings of the present invention, it has better reflective and heat-insulating effects compared to granular, powdered, and large-flake CeO2.

[0025] The content of flake CeO2 is 10-20 parts by weight; preferably 14-18 parts by weight; more preferably 16-17 parts by weight. This ensures that the coating has excellent emissivity and heat insulation properties, while also guaranteeing that other properties of the coating meet the application requirements.

[0026] LaPO4 has a monazite structure. The grain size D of LaPO4 is... 50 The thickness can be 0.3–1.5 μm; preferably 0.5–1.2 μm; more preferably 0.7–1.0 μm. The combined use of LaPO4 and flake-like CeO2 can improve the heat insulation and reflective properties of the coating.

[0027] The LaPO4 content is 1 to 6 parts by weight; preferably 2 to 5 parts by weight; more preferably 4 to 5 parts by weight. This ensures that the coating has excellent reflective and heat-insulating properties, while also guaranteeing that other properties of the coating meet the application requirements.

[0028] The kaolin content can be 6 to 15 parts by weight; preferably 7 to 10 parts by weight; more preferably 7 to 8 parts by weight. The kaolin grade can be ASP G90, which is produced by BASF AG.

[0029] The content of barium sulfate can be 2 to 7 parts by weight; preferably 3 to 6 parts by weight; more preferably 3.5 to 4 parts by weight.

[0030] The content of heavy calcium carbonate can be 5 to 12 parts by weight; preferably 7 to 10 parts by weight; more preferably 8 to 8.5 parts by weight.

[0031] The content of the dispersant can be 0.3 to 1.5 parts by weight; preferably 0.5 to 1.2 parts by weight; more preferably 0.8 to 0.9 parts by weight. The dispersant can be BYK-190.

[0032] The content of the wetting agent can be 0.2 to 1.3 parts by weight; preferably 0.3 to 1 part by weight; more preferably 0.5 to 0.7 parts by weight. The wetting agent can be BYK-199.

[0033] The content of the defoamer can be 0.2 to 1.3 parts by weight; preferably 0.3 to 1 part by weight; more preferably 0.5 to 0.7 parts by weight. The defoamer can be BYK093.

[0034] The leveling agent content can be 0.05 to 0.45 parts by weight; preferably 0.1 to 0.3 parts by weight; more preferably 0.15 to 0.2 parts by weight. The leveling agent can be BYK349.

[0035] The film-forming agent content can be 1 to 6 parts by weight; preferably 2 to 5 parts by weight; more preferably 3 to 4 parts by weight. The film-forming agent can be an aliphatic ester compound containing a hydroxyl substituent; preferably a dodecyl alcohol ester.

[0036] The content of the anti-settling agent can be 0.1 to 0.8 parts by weight; preferably 0.2 to 0.6 parts by weight; more preferably 0.3 to 0.4 parts by weight. The anti-settling agent can be BYK420.

[0037] The pH adjuster content can be 0.05 to 0.6 parts by weight; preferably 0.1 to 0.4 parts by weight; more preferably 0.2 to 0.3 parts by weight. The pH adjuster can be AMP-95, which is manufactured by Dow Chemical.

[0038] The water content can be 10 to 30 parts by weight; preferably 15 to 25 parts by weight; more preferably 19 to 20 parts by weight.

[0039] intermediate paint components The intermediate paint components include water-based resin and La x Ce (1-x) O (2-0.5x) Hollow microspheres. In some embodiments, the intermediate paint component further includes kaolin, barium sulfate, and heavy calcium carbonate. Further, the intermediate paint component may also include one or more of a dispersant, wetting agent, defoamer, leveling agent, film-forming agent, anti-settling agent, pH adjuster, and water. Preferably, the intermediate paint component consists of the aforementioned components.

[0040] The waterborne resin can be selected from one or more of acrylic resin, fluorocarbon resin, and silicone-acrylic resin. The acrylic resin can be designated RS927, produced by the BADF Group. The silicone-acrylic resin can be designated RS-3799A, produced by the BADF Group. The fluorocarbon resin can be designated HLR-WR01, produced by Shandong Huafu Chemical Co., Ltd. The content of the waterborne resin is 25-35 parts by weight; preferably 28-33 parts by weight; more preferably 30-32 parts by weight.

[0041] La x Ce (1-x) O (2-0.5x) The particle size D of hollow microspheres 50 The thickness can be 13–28 μm; preferably 17–23 μm; more preferably 20–21 μm. The wall thickness of the hollow microspheres can be 80–175 nm; preferably 100–160 nm; more preferably 140–150 nm. The loose packing density of the hollow microspheres can be 1.1–1.7 g / cm³. 3 The preferred concentration is 1.2–1.5 g / cm³. 3 More preferably, it is 1.25–1.3 g / cm³. 3 x is 0 to 0.5; preferably, x is 0.3 to 0.5; more preferably, x is 0.45 to 0.5. In some embodiments, x is 0. In other embodiments, x is 0.36. In still other embodiments, x is 0.5. The hollow microspheres can be prepared according to the method disclosed in CN119430262A. The application of such hollow microspheres to the intermediate paint component can improve the reflectivity and heat insulation properties of the coating.

[0042] The content of hollow microspheres is 15-25 parts by weight; preferably 18-24 parts by weight; more preferably 22-23 parts by weight. This ensures that the coating has excellent reflective and heat-insulating properties while also guaranteeing that other properties of the coating meet the application requirements.

[0043] The kaolin content can be 3 to 17 parts by weight; preferably 5 to 15 parts by weight; more preferably 6 to 8 parts by weight. The kaolin grade can be ASP G90, which is produced by BASF AG.

[0044] The content of barium sulfate can be 1 to 7 parts by weight; preferably 3 to 6 parts by weight; more preferably 4 to 4.5 parts by weight.

[0045] The content of heavy calcium carbonate can be 5 to 15 parts by weight; preferably 7 to 13 parts by weight; more preferably 11 to 12 parts by weight.

[0046] The content of the dispersant can be 0.3 to 1.5 parts by weight; preferably 0.5 to 1.2 parts by weight; more preferably 0.7 to 0.8 parts by weight. The dispersant can be BYK-190.

[0047] The content of the wetting agent can be 0.3 to 1.3 parts by weight; preferably 0.4 to 1 part by weight; more preferably 0.5 to 0.7 parts by weight. The wetting agent can be BYK-199.

[0048] The content of the defoamer can be 0.2 to 1.3 parts by weight; preferably 0.3 to 1 part by weight; more preferably 0.5 to 0.7 parts by weight. The defoamer can be BYK093.

[0049] The leveling agent content can be 0.05 to 0.45 parts by weight; preferably 0.1 to 0.3 parts by weight; more preferably 0.15 to 0.2 parts by weight. The leveling agent can be BYK349.

[0050] The content of the film-forming agent can be 0.5 to 5 parts by weight; preferably 1 to 4 parts by weight; more preferably 2.5 to 3.5 parts by weight. The film-forming agent can be an aliphatic ester compound containing a hydroxyl substituent; preferably a dodecyl alcohol ester.

[0051] The content of the anti-settling agent can be 0.1 to 0.8 parts by weight; preferably 0.2 to 0.6 parts by weight; more preferably 0.3 to 0.4 parts by weight. The anti-settling agent can be BYK420.

[0052] The pH adjuster content can be 0.05 to 0.6 parts by weight; preferably 0.1 to 0.4 parts by weight; more preferably 0.2 to 0.3 parts by weight. The pH adjuster can be AMP-95, which is manufactured by Dow Chemical.

[0053] The water content can be 10 to 30 parts by weight; preferably 15 to 25 parts by weight; more preferably 19 to 20 parts by weight.

[0054] Topcoat components The topcoat components include a water-based resin, LaPO4, and LaBO3. In some embodiments, the topcoat components further include kaolin, barium sulfate, and heavy calcium carbonate. Further, the topcoat components may also include one or more of a dispersant, wetting agent, defoamer, leveling agent, film-forming agent, anti-settling agent, pH adjuster, and water. Preferably, the topcoat components consist of the aforementioned components.

[0055] The waterborne resin can be selected from one or more of acrylic resin, fluorocarbon resin, and silicone-acrylic resin. The acrylic resin can be designated RS927, produced by the BADF Group. The silicone-acrylic resin can be designated RS-3799A, produced by the BADF Group. The fluorocarbon resin can be designated HLR-WR01, produced by Shandong Huafu Chemical Co., Ltd. The content of the waterborne resin is 25-35 parts by weight; preferably 28-33 parts by weight; more preferably 30-32 parts by weight.

[0056] LaPO4 has a monazite structure. The grain size D of LaPO4 is... 50 The micrometer size can be 0.3–1.5 μm; preferably 0.5–1.2 μm; more preferably 0.7–1.0 μm. The LaPO4 content is 1–6 parts by weight; preferably 2–5 parts by weight; more preferably 4–5 parts by weight. This ensures that the coating has excellent reflective and heat-insulating properties while also guaranteeing that other properties of the coating meet the application requirements.

[0057] The particle size D of LaBO3 50 The particle size is 1–5 μm; preferably, the particle size D 50 The particle size is 1–3 μm; more preferably, the particle size D 50 The thickness is 1–2 μm. The combined use of LaBO3 and LaPO4 can improve the reflectivity and heat insulation properties of coatings.

[0058] The LaBO3 content can be 4 to 9 parts by weight; preferably 4.5 to 7 parts by weight; more preferably 6.5 to 7 parts by weight. This ensures that the coating has excellent reflective and heat insulation properties while also guaranteeing that other properties of the coating meet the application requirements.

[0059] The kaolin content can be 3 to 27 parts by weight; preferably 5 to 23 parts by weight; more preferably 6 to 8 parts by weight. The kaolin grade can be ASP G90, which is produced by BASF AG.

[0060] The content of barium sulfate can be 3 to 10 parts by weight; preferably 4 to 8 parts by weight; more preferably 6 to 7 parts by weight.

[0061] The content of heavy calcium carbonate can be 3 to 25 parts by weight; preferably 7 to 22 parts by weight; more preferably 18 to 21 parts by weight.

[0062] The content of the dispersant can be 0.3 to 1.5 parts by weight; preferably 0.5 to 1.2 parts by weight; more preferably 0.7 to 0.8 parts by weight. The dispersant can be BYK-190.

[0063] The content of the wetting agent can be 0.3 to 1.5 parts by weight; preferably 0.4 to 1 part by weight; more preferably 0.5 to 0.7 parts by weight. The wetting agent can be BYK-199.

[0064] The content of the defoamer can be 0.2 to 1.3 parts by weight; preferably 0.3 to 1 part by weight; more preferably 0.5 to 0.7 parts by weight. The defoamer can be BYK093.

[0065] The leveling agent content can be 0.05 to 0.45 parts by weight; preferably 0.1 to 0.3 parts by weight; more preferably 0.15 to 0.2 parts by weight. The leveling agent can be BYK349.

[0066] The content of the film-forming agent can be 1 to 6 parts by weight; preferably 2 to 4 parts by weight; more preferably 2.5 to 3.5 parts by weight. The film-forming agent can be an aliphatic ester compound containing a hydroxyl substituent; preferably a dodecyl alcohol ester.

[0067] The content of the anti-settling agent can be 0.1 to 0.8 parts by weight; preferably 0.2 to 0.6 parts by weight; more preferably 0.3 to 0.4 parts by weight. The anti-settling agent can be BYK420.

[0068] The pH adjuster content can be 0.05 to 0.6 parts by weight; preferably 0.1 to 0.4 parts by weight; more preferably 0.2 to 0.3 parts by weight. The pH adjuster can be AMP-95, which is manufactured by Dow Chemical.

[0069] The water content can be 10 to 30 parts by weight; preferably 15 to 25 parts by weight; more preferably 19 to 20 parts by weight.

[0070] Preparation method of reflective heat insulation coating The preparation method of the reflective heat-insulating coating of the present invention includes the following steps: (1) mixing raw materials including water-based resin, flake CeO2 and LaPO4 to obtain a primer component; (2) mixing raw materials including water-based resin and LaPO4 to obtain a primer component. x Ce (1-x) O (2-0.5x) (3) The raw materials of hollow microspheres are mixed to obtain the intermediate paint component; and the raw materials including water-based resin, LaBO3 and LaPO4 are mixed to obtain the topcoat component. The composition of the raw materials is as described above and will not be repeated here.

[0071] Specifically, step (1) includes the following steps: mixing water and dispersant to form a first primer mixture; sequentially adding flake CeO2, LaPO4, kaolin, barium sulfate and heavy calcium carbonate to the first primer mixture, and mixing to obtain a second primer mixture; sequentially adding wetting agent, defoamer, waterborne resin, leveling agent, film-forming agent, anti-settling agent and pH adjuster to the second primer mixture, and mixing to obtain primer components.

[0072] Specifically, step (2) includes the following steps: mixing water and dispersant to form a first intermediate paint mixture; adding hollow microspheres, kaolin, barium sulfate and heavy calcium carbonate to the first intermediate paint mixture in sequence, and mixing to obtain a second intermediate paint mixture; adding wetting agent, defoamer, waterborne resin, leveling agent, film-forming agent, anti-settling agent and pH adjuster to the second intermediate paint mixture in sequence, and mixing to obtain the intermediate paint component.

[0073] Specifically, step (3) includes the following steps: mixing water and dispersant to form a first topcoat mixture; adding LaBO3, LaPO4, kaolin, barium sulfate and heavy calcium carbonate to the first topcoat mixture in sequence, and mixing to obtain a second topcoat mixture; adding wetting agent, defoamer, waterborne resin, leveling agent, film-forming agent, anti-settling agent and pH adjuster to the second topcoat mixture in sequence, and mixing to obtain the topcoat components.

[0074] Coatings and their preparation methods The coating of this invention includes a primer layer, a mid-coat layer, and a topcoat layer. The primer layer is formed of a primer component, the mid-coat layer is formed of a mid-coat component, and the topcoat layer is formed of a topcoat component. The mid-coat layer is located between the primer layer and the topcoat layer. The primer layer is bonded to the substrate. The compositions of the primer component, mid-coat component, and topcoat component are as described above and will not be repeated here.

[0075] The thickness of the primer layer can be 80–150 μm; preferably 100–140 μm; more preferably 120–130 μm.

[0076] The thickness of the intermediate paint layer can be 80–150 μm; preferably 100–140 μm; more preferably 120–130 μm.

[0077] The thickness of the topcoat layer can be 80–120 μm; preferably 90–120 μm; more preferably 100–110 μm.

[0078] The coating preparation method of the present invention includes the following steps: coating a primer component onto the surface of a substrate, and drying to form a primer layer on the surface of the substrate; coating a mid-coat component onto the surface of the primer layer, and drying to form a mid-coat layer on the surface of the primer layer; coating a topcoat component onto the surface of the mid-coat layer, and drying to form a topcoat layer on the surface of the mid-coat layer.

[0079] The test methods used in the following embodiments and comparative examples are as follows: Solar reflectance and near-infrared reflectance: The methods specified in Appendix A of GB / T 25261-2010 "Reflective Thermal Insulation Coatings for Buildings" were adopted. Test equipment: Shimadzu 3600i plus.

[0080] Hemispherical emissivity: The method specified in Appendix B of GB / T 25261-2010 "Reflective Thermal Insulation Coatings for Buildings" was adopted. Test equipment: Nicolet iS50.

[0081] Temperature drop difference on the back of the reference blackboard: The method specified in Appendix C of GB / T 25261-2010 "Reflective Thermal Insulation Coatings for Buildings" was adopted.

[0082] The particle size D of plate-like CeO2 50And thickness: Particle size was measured by a laser particle size analyzer (Malvin 3000); thickness was measured by a scanning electron microscope (Sigma 300).

[0083] The raw materials are described below: The dispersant was BYK-190, manufactured by BYK Chemical GmbH, Germany.

[0084] LaPO4 has a monazite structure and a grain size D. 50 It is 1μm and was purchased from Baotou Rare Earth Research Institute.

[0085] LaBO3 particle size D 50 It is 1μm and was purchased from Baotou Rare Earth Research Institute.

[0086] Kaolin is ASP G90 kaolin produced by BASF AG.

[0087] The wetting agent is BYK-199, manufactured by BYK Chemical GmbH, Germany.

[0088] The defoamer is BYK093, manufactured by BYK Chemical GmbH, Germany.

[0089] The leveling agent is BYK349, manufactured by BYK Chemical GmbH, Germany.

[0090] The anti-settling agent is BYK420, manufactured by BYK Chemical GmbH, Germany.

[0091] The pH adjuster is AMP-95, a multifunctional amine additive manufactured by Dow Chemical.

[0092] The acrylic resin, designated RS927, is manufactured by the BADF Group.

[0093] The silicone-acrylic resin, designated RS-3799A, is manufactured by the BADEFU Group.

[0094] The fluorocarbon resin, designated HLR-WR01, is produced by Shandong Huafu Chemical Co., Ltd.

[0095] La 0.36 Ce 0.64 O 1.82 The powder was purchased from China Northern Rare Earth (Group) High-Tech Co., Ltd.

[0096] La 0.5 Ce 0.5 O 1.75 The powder was purchased from China Northern Rare Earth (Group) High-Tech Co., Ltd.

[0097] Particle size D of powdered CeO2 50 The size is 1.2μm, purchased from China Northern Rare Earth (Group) High-Tech Co., Ltd.

[0098] The loose packing density of hollow glass microspheres is 0.32 g / cm³. 3 Particle size D 50 It has a diameter of 26 μm and a wall thickness of 1000 nm, and was purchased from 3M Company in the United States.

[0099] Preparation Example 1 Add 500 mL of water to the reaction vessel. While stirring, heat the water in the reaction vessel to 50 °C, then slowly and simultaneously add a 1.0 mol / L cerium chloride solution and a 2.50 mol / L ammonium bicarbonate solution, maintaining the pH of the reaction system at 7.5 to obtain rare earth carbonates. The molar ratio of cerium chloride to ammonium bicarbonate is 1:3.4.

[0100] Rare earth carbonates were calcined at 900℃ for 3 hours to obtain plate-like CeO2. The particle size D of the plate-like CeO2 was... 50 It has a thickness of 1.9 μm and a thickness range of 50–60 nm.

[0101] Figure 1 The image shows the SEM image of the obtained flake-like CeO2.

[0102] Preparation Example 2 CeO2 hollow microspheres were prepared according to the method in Example 1 of Chinese patent application CN119430262A, with a loose packing density of 1.34 g / cm³. 3 Particle size D 50 The diameter is 18.8 μm and the wall thickness is 105 nm. The specific method is as follows: (1) Add 100L of deionized water and 0.1kg of ammonium polyacrylate to the grinding mill dispersion tank, stir and disperse evenly, then turn on the grinding mill and gradually add 100kg of CeO2 powder. During the grinding process, the pH value of the suspension is controlled at 9. When the particle size of the powder in the suspension is less than 500nm, stop grinding and transport the suspension to the spray granulation dispersion tank. Add 2kg of PVA and disperse at high speed to obtain CeO2 spray granulation slurry.

[0103] (2) Turn on the spray granulator, control the inlet temperature at 110℃, and feed the spray granulation slurry into the spray granulator at a uniform speed. Collect the hollow microspheres in the collector and then calcine them at 800℃ to obtain CeO2 hollow microspheres.

[0104] Preparation Example 3 La 0.36 Ce 0.64 O 1.82 Hollow microspheres were prepared according to the method in Example 2 of Chinese patent application CN119430262A, with a loose bulk density of 1.33 g / cm³. 3 Particle size D 50The diameter is 21.4 μm and the wall thickness is 128 nm. The specific method is as follows: (1) Add 100L of deionized water and 0.2kg of ammonium polyacrylate to the dispersion tank of the grinder, stir and disperse evenly, then turn on the grinder and gradually add 200kg of La 0.36 Ce 0.64 O 1.82 During the grinding process, the pH of the suspension was controlled at 9. Grinding was stopped when the particle size in the suspension was less than 500 nm. The suspension was then transferred to a spray granulation and dispersion tank, where 12 kg of Triton X-100 was added. After high-speed dispersion, La was obtained. 0.36 Ce 0.64 O 1.82 Spray granulation slurry.

[0105] (2) Turn on the spray granulator, control the inlet temperature at 120℃, and feed the spray granulated slurry into the spray granulator at a uniform speed. Collect the hollow microspheres in the collector, and then calcine them at 1000℃ to obtain La. 0.36 Ce 0.64 O 1.82 Hollow microspheres.

[0106] Preparation Example 4 La 0.5 Ce 0.5 O 1.75 Hollow microspheres were prepared according to the method in Example 3 of Chinese patent application CN119430262A, with a loose bulk density of 1.30 g / cm³. 3 Particle size D 50 The diameter is 20.9 μm and the wall thickness is 148 nm. The specific method is as follows: (1) Add 100L of deionized water and 0.15kg of ammonium polyacrylate to the dispersion tank of the grinder, stir and disperse evenly, then turn on the grinder and gradually add 150kg of La 0.5 Ce 0.5 O 1.75 During the grinding process of the powder, the pH value of the suspension was controlled at 9. When the particle size of the powder in the suspension was less than 500 nm, grinding was stopped, and the suspension was transported to a spray granulation and dispersion tank. 3 kg of PVA was added, and after high-speed dispersion, La was obtained. 0.5 Ce 0.5 O 1.75 Spray granulation slurry.

[0107] (2) Turn on the spray granulator, control the inlet temperature at 130℃, and feed the slurry into the spray granulator at a uniform speed. Collect the hollow microspheres in the collector, and then calcine them at 1200℃ to obtain La. 0.5 Ce 0.5 O 1.75 Hollow microspheres.

[0108] Examples 1-3 Preparation of primer components: 19 parts by weight of deionized water and dispersant were added to a dispersion tank and stirred evenly to form a first primer mixture; flake CeO2, LaPO4, kaolin, barium sulfate and heavy calcium carbonate were added to the first primer mixture in sequence and stirred evenly to obtain a second primer mixture; wetting agent, defoamer, waterborne resin, leveling agent, dodecyl alcohol ester, anti-settling agent and pH adjuster were added to the second primer mixture in sequence and stirred evenly to obtain the primer components.

[0109] Preparation of intermediate paint components: 19.5 parts by weight of deionized water and dispersant were added to a dispersion tank and stirred evenly to form a first intermediate paint mixture; hollow microspheres, kaolin, barium sulfate and heavy calcium carbonate were added to the first intermediate paint mixture in sequence and stirred evenly to obtain a second intermediate paint mixture; wetting agent, defoamer, water-based resin, leveling agent, dodecyl alcohol ester, anti-settling agent and pH adjuster were added to the second intermediate paint mixture in sequence and stirred evenly to obtain the intermediate paint component.

[0110] Preparation of topcoat components: 19.5 parts by weight of deionized water and dispersant were added to a dispersion tank and stirred evenly to form a first topcoat mixture; LaBO3, LaPO4, kaolin, barium sulfate and heavy calcium carbonate were added to the first topcoat mixture in sequence and stirred evenly to obtain a second topcoat mixture; wetting agent, defoamer, waterborne resin, leveling agent, dodecyl alcohol ester, anti-settling agent and pH adjuster were added to the second topcoat mixture in sequence and stirred evenly to obtain the topcoat components.

[0111] The selection and dosage of raw materials are shown in Tables 1-1 to 1-3.

[0112]

[0113]

[0114]

[0115] Comparative Example 1 Except for the following raw materials, which differ from those in Example 1, the rest are the same as in Example 1: Primer components: replace flake CeO2 with powdered CeO2, and replace LaPO4 with Zn3(PO4)2 (particle size D). 50 (1μm).

[0116] Medium paint component: Hollow microspheres are replaced with hollow glass microspheres.

[0117] Topcoat components: Replace LaBO3 with powdered CeO2 and LaPO4 with rutile TiO2.

[0118] Comparative Example 2 Except for the following raw materials, which differ from those in Example 2, the rest are the same as in Example 2: Primer components: replace flake CeO2 with powdered CeO2, and replace LaPO4 with Zn3(PO4)2 (particle size D). 50 (1μm).

[0119] Medium paint component: Hollow microspheres are replaced with hollow glass microspheres.

[0120] Topcoat components: Replace LaBO3 with powdered La 0.36 Ce 0.64 O 1.82 (particle size D) 50 (1.5 μm), LaPO4 was replaced with rutile TiO2.

[0121] Comparative Example 3 Except for the following raw materials, which differ from those in Example 1, the rest are the same as in Example 1: Primer components: replace flake CeO2 and LaPO4 with 16 parts by weight of CeO2 hollow microspheres.

[0122] Comparative Example 4 Except for the following raw materials, which differ from those in Example 1, the rest are the same as in Example 1: Primer components: 2 parts by weight of flake CeO2 and 14 parts by weight of LaPO4.

[0123] Comparative Example 5 Except for the following raw materials, which differ from those in Example 1, the rest are the same as in Example 1: Topcoat components: 2.25 parts by weight of LaBO3 and 4.5 parts by weight of LaPO4.

[0124] Examples 4-6 and Comparative Examples 6-10 A primer component is applied to the surface of a substrate, and after drying, a primer layer with a thickness of 120 μm is formed on the substrate surface. A mid-coat component is applied to the surface of the primer layer, and after drying, a mid-coat layer with a thickness of 120 μm is formed on the surface of the primer layer. A topcoat component is applied to the surface of the mid-coat layer, and after drying, a topcoat layer with a thickness of 100 μm is formed on the surface of the mid-coat layer, thereby forming a coating consisting of a primer layer, a mid-coat layer, and a topcoat layer on the surface of the substrate.

[0125] The selection of primer components, intermediate coat components, and topcoat components, as well as the performance of the coating, are shown in Table 2.

[0126]

[0127] This invention is not limited to the above-described embodiments. Any modifications, improvements, or substitutions that can be conceived by those skilled in the art without departing from the essential content of this invention fall within the scope of this invention.

Claims

1. A reflective heat-insulating coating, characterized in that, The reflective heat-insulating coating includes a primer component, a middle coat component, and a top coat component; The primer components include 30-40 parts by weight of waterborne resin, 10-20 parts by weight of flake CeO2, and 1-6 parts by weight of LaPO4; wherein the particle size D of the flake CeO2 is... 50 The thickness is 1–5 μm and less than 100 nm. The intermediate paint component includes 25-35 parts by weight of water-based resin and 15-25 parts by weight of La. x Ce (1-x) O (2-0.5x) Hollow microspheres; where x is 0 to 0.5; The topcoat components include 25-35 parts by weight of waterborne resin, 4-9 parts by weight of LaBO3 and 1-6 parts by weight of LaPO4.

2. The reflective heat-insulating coating according to claim 1, characterized in that, The LaPO4 has a monazite structure, and the grain size D of the LaPO4 is... 50 Its thickness ranges from 0.3 to 1.5 μm. The particle size D of the hollow microspheres 50 The hollow microspheres have a diameter of 13–28 μm, a wall thickness of 80–175 nm, and a bulk density of 1.1–1.7 g / cm³. 3 .

3. The reflective heat-insulating coating according to claim 1, characterized in that, The waterborne resin is selected from one or more of acrylic resin, fluorocarbon resin, and silicone-acrylic resin.

4. The reflective heat-insulating coating according to claim 1, characterized in that, The primer components also include 6-15 parts by weight of kaolin, 2-7 parts by weight of barium sulfate and 5-12 parts by weight of heavy calcium carbonate. The medium paint component also includes 3-17 parts by weight of kaolin, 1-7 parts by weight of barium sulfate and 5-15 parts by weight of heavy calcium carbonate; The topcoat components also include 3-27 parts by weight of kaolin, 3-10 parts by weight of barium sulfate and 3-25 parts by weight of heavy calcium carbonate.

5. The reflective heat-insulating coating according to claim 4, characterized in that, The primer components also include one or more of the following: dispersant, wetting agent, defoamer, leveling agent, film-forming agent, anti-settling agent, pH adjuster, and water. The medium paint components also include dispersants, wetting agents, defoamers, leveling agents, film-forming agents, anti-settling agents, pH adjusters, and one or more of the following in water: The topcoat components also include one or more of the following: dispersant, wetting agent, defoamer, leveling agent, film-forming agent, anti-settling agent, pH adjuster, and water.

6. The reflective heat-insulating coating according to claim 5, characterized in that, The dispersant is BYK-190, the wetting agent is BYK-199, the defoamer is BYK093, the leveling agent is BYK349, the film-forming agent is an aliphatic ester compound containing hydroxyl substituents, the anti-settling agent is BYK420, and the pH adjuster is AMP-95.

7. The method for preparing the reflective heat-insulating coating according to any one of claims 1 to 6, characterized in that, Includes the following steps: (1) Mix raw materials including water-based resin, flake CeO2 and LaPO4 to obtain primer components; (2) Including water-based resin and La x Ce (1-x) O (2-0.5x) The raw materials for hollow microspheres are mixed to obtain the intermediate paint component; (3) Mix the raw materials including water-based resin, LaBO3 and LaPO4 to obtain the topcoat component.

8. A coating, characterized in that, The coating includes a primer layer, an intermediate coat layer, and a topcoat layer; The primer layer is formed from the primer component of the reflective heat-insulating coating according to any one of claims 1 to 6; The intermediate paint layer is formed from the intermediate paint component in the reflective heat-insulating coating according to any one of claims 1 to 6; The topcoat layer is formed from the topcoat component of the reflective heat-insulating coating according to any one of claims 1 to 6.

9. The coating according to claim 8, characterized in that, The thickness of the primer layer is 80–150 μm, the thickness of the intermediate coat layer is 80–150 μm, and the thickness of the topcoat layer is 80–120 μm.

10. The method for preparing the coating according to claim 8, characterized in that, The process includes the following steps: applying a primer component to the surface of a substrate, drying it to form a primer layer on the substrate surface; applying a mid-coat component to the surface of the primer layer, drying it to form a mid-coat layer on the surface of the primer layer; A topcoat component is applied to the surface of the intermediate paint layer, and after drying, a topcoat layer is formed on the surface of the intermediate paint layer.

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