Inorganic reflective heat-insulation light ceramic colored stone coating and preparation method thereof

Abstract

The invention relates to the technical field of building coatings, and discloses an inorganic reflective heat-insulation light ceramic colored stone coating and a preparation method thereof.The inorganic reflective heat-insulation light ceramic colored stone coating comprises core-shell structure colorful stone-like micro units and inorganic reflective heat-insulation light base slurry; the core-shell structure colorful stone-like micro-unit comprises an organic color core and an inorganic functional shell layer coating the surface of the organic color core, the organic color core comprises the following components: a solid of an organic silicon modified acrylic emulsion; a nanoscale inorganic pigment; the inorganic functional shell layer is silicon dioxide; the inorganic reflective insulation light base slurry comprises the following components: a potassium silicate solution; active silica sol; a geopolymer precursor powder material; a solid alkali activator; high-efficiency synergistic reflective heat-insulation pigments and fillers; compounding a light functional filler; a functional auxiliary agent; and water. By adopting the interface-enhanced core-shell colorful micro-unit and the inorganic base slurry containing the geopolymer and the efficient reflecting material, the weather resistance, the heat insulation effect and the comprehensive mechanical property of the stone-like coating are improved.

Description

Technical Field

[0001] The invention relates to the technical field of architectural coatings, in particular to an inorganic reflective heat-insulating lightweight ceramic colored stone coating and a preparation method thereof. Background Art

[0002] As architectural decorative materials continue to evolve toward aesthetics, durability, and functionality, market demand for coatings that mimic the texture of natural stone while also offering superior performance is growing. While colorful stone-like coatings are popular for their unique decorative effects and affordability, improvements and innovations in existing technologies are urgently needed to further enhance their long-term performance in outdoor environments and provide them with additional functional properties, such as increased durability, enhanced thermal insulation, and improved overall physical and chemical stability.

[0003] Currently, the most common technical approach for multi-colored stone-like paints on the market involves using an organic polymer emulsion as the primary film-forming substance. Particles containing organic or inorganic pigments of varying colors and shapes (i.e., multi-colored stone-like microunits) are pre-prepared and then dispersed in a continuous binder. During construction, this mixture is applied to the building surface by spraying or other methods, drying and curing to form a coating with a simulated stone appearance. Some products also incorporate conventional fillers into the binder to improve certain physical properties of the coating.

[0004] While existing technologies have achieved a certain degree of decorative stone-like effects, some shortcomings remain. For example, the chemical structure of the organic pigments in the colorful stone-like micro-units is easily altered by long-term exposure to natural factors such as ultraviolet rays and rain, leading to visible color fading and loss of gloss in the coating, which significantly shortens the aesthetic lifespan of the building's exterior finishes. Furthermore, the interfacial bonding between these micro-units and the base slurry is often less than ideal, and the micro-units themselves have limited resistance to environmental stresses. Over time, this can easily cause the colored dots to peel off or break from the coating, affecting the integrity and durability of the finish. Furthermore, existing coating systems generally perform poorly in terms of thermal insulation, making it difficult to effectively reflect near-infrared heat from solar radiation, and thus making limited contributions to reducing building energy consumption. The mechanical strength and chemical resistance of the base slurry itself also need to be improved to meet the challenges of more complex external environments. Summary of the Invention

[0005] In response to the shortcomings of the existing technology, the present invention provides an inorganic reflective heat-insulating lightweight ceramic colored stone paint and a preparation method thereof, which solves the problems commonly existing in the existing technology of colorful imitation stone paint, such as poor weather resistance, lack of effective heat insulation function, insufficient mechanical strength and chemical stability, and difficulty in ensuring product uniformity.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: an inorganic reflective heat-insulating lightweight ceramic color stone coating, the ceramic color stone coating comprising a core-shell structure colorful imitation stone micro-unit and an inorganic reflective heat-insulating lightweight base slurry;

[0007] The core-shell structured colorful stone-like micro-unit comprises an organic color core and an inorganic functional shell layer coated on the surface of the organic color core;

[0008] The organic color core comprises the following components in parts by weight:

[0009] Solid matter of silicone-modified acrylic emulsion: 45-55 parts;

[0010] Nano-scale inorganic pigments: 1-15 parts;

[0011] Nonionic wetting and dispersing agent: 0.2-1.5 parts;

[0012] The inorganic functional shell layer is silicon dioxide: 0.1-5 parts;

[0013] The organic color core is the source of the colorful stone-like effect. Silicone-modified acrylic emulsion is selected as the film-forming substance. By leveraging the excellent weather resistance of silicone and the good film-forming and adhesion properties of acrylate, it provides a stable and flexible carrier for the pigment. The selected nano-scale inorganic pigment not only provides vivid and long-lasting color, but its small size also helps to improve color uniformity and hiding power. The addition of a non-ionic wetting and dispersing agent ensures the uniform dispersion of the nano-pigment in the organic emulsion matrix, avoiding color difference or performance degradation caused by pigment agglomeration, and laying the foundation for the subsequent formation of a uniform color core.

[0014] The silica shell protects the organic color core of the present invention. Organic materials generally lack the resistance to aging, UV rays, and chemical attack of inorganic materials. By constructing a dense inorganic silica shell on the surface of the organic color core, it provides external defense for the relatively fragile "core." Because silica itself possesses excellent chemical stability, hardness, weather resistance, and UV shielding capabilities, the presence of this inorganic shell effectively isolates the internal organic color core from direct erosion by external environmental factors (such as moisture, oxygen, UV rays, acids and alkalis), significantly improving the color durability and overall lifespan of the stone-like micro-units.

[0015] The inorganic reflective heat-insulating lightweight base slurry comprises the following components in parts by weight:

[0016] Potassium silicate solution: 30-80 parts;

[0017] Active silica sol: 10-40 parts;

[0018] Geopolymer precursor powder: 20-60 parts;

[0019] Solid base activator: 5-15 parts;

[0020] High-efficiency synergistic reflective heat-insulating pigments and fillers: 30-120 parts;

[0021] Composite lightweight functional filler: 10-60 parts;

[0022] Functional additives: 0.5-5 parts;

[0023] Water: 40-100 parts;

[0024] The inorganic reflective heat-insulating lightweight base slurry not only provides load-bearing and bonding for the colorful stone-like micro-units of the core-shell structure, but also gives the coating core functions such as reflective heat insulation and lightweighting. Among them, potassium silicate solution, as the main inorganic binder, can provide good substrate adhesion and initial strength, and itself has certain fire-resistant properties. The introduced active silica sol can fill the micropores of the gelling material after curing, improving the density and durability of the system. The introduction of geopolymer (generated by the reaction of its precursor powder with a solid alkali activator) is a major feature of this base slurry. The geopolymer itself has high strength, excellent chemical corrosion resistance, good high-temperature stability and low environmental load. The combination of these inorganic gelling materials forms an inorganic network structure with complementary properties, stable structure and strong durability, providing a solid skeleton support for the entire coating.

[0025] The addition of highly effective, synergistic reflective thermal insulation pigments and fillers, along with composite lightweight functional fillers, reduces heat absorption by highly reflecting mid-infrared radiation from sunlight, while the latter reduces coating weight and aids thermal insulation by introducing low-density materials. These functional fillers, evenly dispersed within the aforementioned inorganic gelling system, work together to impart the coating with excellent reflective, thermal insulation, and lightweight properties.

[0026] The addition amount of the core-shell structure colorful imitation stone micro-unit is 20-60 parts relative to 100 parts of the inorganic reflective heat-insulating lightweight base slurry.

[0027] An appropriate amount of colorful stone-like micro-units ensures a good stone-like decorative effect, while an ample amount of inorganic base slurry ensures the coating's continuity, adhesion, and various physical and chemical properties. The two are tightly bonded through the base slurry's bonding action, and the inorganic shell layer on the surface of the colorful micro-units also forms an interfacial bond with the inorganic base slurry, forming an overall stable and functionally synergistic coating system.

[0028] Preferably, the silicon dioxide of the inorganic functional shell layer forms a nanofilm with a thickness of 10-100 nm.

[0029] Preferably, the geopolymer precursor powder in the inorganic reflective heat-insulating lightweight base slurry is metakaolin that has been thermally activated.

[0030] Preferably, the high-efficiency synergistic reflective heat-insulating pigments and fillers in the inorganic reflective heat-insulating lightweight base slurry include the following components in parts by weight:

[0031] High infrared reflective rutile nano-titanium dioxide: 15-70 parts;

[0032] Hollow glass microspheres: 15-50 parts;

[0033] The composite lightweight functional filler comprises the following components in parts by weight:

[0034] Closed-cell expanded perlite powder: 5-30 parts;

[0035] Calcined kaolin: 5-30 parts.

[0036] Preferably, the average particle size of the organic color core is 50-500 microns.

[0037] The present invention also provides a method for preparing an inorganic reflective heat-insulating lightweight ceramic colored stone coating, which is used to prepare the above-mentioned inorganic reflective heat-insulating lightweight ceramic colored stone coating, comprising the following steps:

[0038] S1. Preparation of colorful stone-like microunits with core-shell structure: A multi-step process is used to prepare colorful stone-like microunits with core-shell structure, which include an organic color core and an inorganic functional silica shell.

[0039] S2. Preparation of inorganic reflective heat-insulating lightweight base slurry: mixing and evenly dispersing the components constituting the inorganic reflective heat-insulating lightweight base slurry;

[0040] S3, compounding the coating: mixing the core-shell structured colorful stone-like micro-units prepared in step S1 with the inorganic reflective heat-insulating lightweight base slurry prepared in step S2 to form a coating;

[0041] S4, paint curing: curing the paint formed in step S3.

[0042] Preferably, the preparation of the core-shell structured colorful stone-like micro-units comprises:

[0043] The solid matter of the organosilicon-modified acrylic emulsion constituting the organic color core, the nano-scale inorganic pigment and the non-ionic wetting and dispersing agent are uniformly mixed, and then formed by spray drying granulation or seed emulsion polymerization to obtain organic color core particles with an average particle size of 50-500 microns;

[0044] Using 0.5-5 parts of silane coupling agent to chemically graft the surface of the obtained organic color core particles;

[0045] Under the conditions of controlling the temperature at 25-60°C and the pH value at 8.5-11.0, an inorganic precursor containing ethyl orthosilicate is hydrolyzed and condensed on the surface of the functionalized pre-treated organic color core particles by a sol-gel method to form an inorganic functional shell layer of silicon dioxide.

[0046] Simple physical coating often results in weak interfacial bonding between the organic core and the inorganic shell, making it prone to delamination or shedding under external stress or environmental changes. Through functionalization pretreatment, the organic functional groups (such as vinyl, amino, epoxy, etc., selected based on the properties of the organic core polymer used) carried on one end of the silane coupling agent can chemically react with the polymer chains on the surface of the organic core or form strong physical adsorption and entanglement, thereby anchoring it to the core surface. The other end of the silane coupling agent is usually a hydrolyzable alkoxysilane group (such as -Si(OCH3)3 or -Si(OC2H5)3). During the subsequent inorganic shell coating process, these groups can undergo a condensation reaction with the silanol (Si-OH) groups produced by the hydrolysis of the inorganic precursor (such as ethyl orthosilicate), forming a stable Si-O-Si chemical bond.

[0047] At the same time, an inorganic precursor (such as tetraethyl orthosilicate, TEOS) undergoes a hydrolysis reaction in the presence of a specific catalyst (acid or base) and water to generate monomers or oligomers containing active silanol (Si-OH) groups. These hydrolysis products have high chemical activity. Subsequently, these active species undergo a condensation reaction on the surface of the functionalized organic color core. Since a large number of hydrophilic or silanol-reactive functional groups have been introduced to the surface of the organic color core through pretreatment, these functional groups become the preferred adsorption and nucleation sites for the hydrolysis products of the inorganic precursor.

[0048] Preferably, the preparation of the inorganic reflective heat-insulating lightweight base slurry includes:

[0049] Potassium silicate solution, active silica sol, geopolymer precursor powder, solid alkali activator, high-efficiency synergistic reflective thermal insulation pigment filler, composite lightweight functional filler, functional additives and water are mixed and dispersed using a programmed dispersing and mixing process;

[0050] The process includes dispersing the pigment components at a high speed of 1500-3000 rpm for 20-40 minutes to a fineness of ≤50 μm, adding hollow glass microspheres, high infrared reflective rutile nano-titanium dioxide, closed-cell expanded perlite powder and calcined kaolin, and stirring at a low speed of 300-800 rpm for 15-30 minutes. The slurry temperature is controlled not to exceed 45° C. during the entire process.

[0051] Preferably, the coating compounding comprises:

[0052] The core-shell structured colorful stone-like microunits prepared in step S1 are added to the inorganic reflective heat-insulating lightweight base slurry prepared in step S2, and mixed for 10-30 minutes at a low shear stirring rate of 30-150 rpm until uniform.

[0053] Preferably, the curing of the coating includes:

[0054] After the coating prepared in step S3 is applied to the base surface, it is naturally cured at an ambient temperature of 5-35°C for 7-28 days, or after the coating is surface-dried, it is assisted cured at a CO2 concentration of 5-15% by volume and a temperature of 20-30°C for 12-48 hours.

[0055] The present invention provides an inorganic reflective heat-insulating lightweight ceramic colored stone coating and a preparation method thereof. It has the following beneficial effects:

[0056] 1. This invention significantly improves the overall durability of the multi-colored stone-like coating by constructing a unique core-shell structure of multi-colored stone-like microunits and optimizing the interface between the organic color core and the inorganic functional shell. The inorganic functional shell effectively resists erosion by external environmental factors and protects the internal organic color core from degradation, allowing the coating to maintain its vibrant color and stone-like texture over time, extending the aesthetics and service life of building exteriors.

[0057] 2. The lightweight inorganic reflective thermal insulation slurry designed in this invention incorporates highly effective, synergistically reflective thermal insulation pigments and fillers, specifically highly infrared-reflective rutile nano-titanium dioxide, to impart excellent solar heat reflection and thermal insulation properties to the coating. This slurry can significantly reduce solar heat gain, lower building energy consumption, and improve indoor thermal comfort, demonstrating its potential for application in energy-efficient buildings.

[0058] 3. This invention utilizes a multi-component inorganic gelling system containing geopolymers in the inorganic reflective, thermally insulating lightweight base slurry. This not only enhances the base slurry's bonding strength but also imparts excellent physical and mechanical properties and chemical stability to the final coating. This strong inorganic network structure makes the coating more wear-resistant and impact-resistant, and effectively resists corrosion from chemicals such as acids and alkalis, making it suitable for more demanding environments.

[0059] 4. By using a programmed dispersion and mixing process to prepare the inorganic reflective, thermally insulating lightweight base slurry, the present invention ensures high uniformity and stability of the slurry components. This refined preparation method effectively avoids agglomeration and sedimentation of pigments and fillers, ensuring uniform quality and storage stability of the coating product. It also facilitates construction and helps form a coating film with excellent appearance and performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] Figure 1 Schematic diagram of the preparation method of the present invention. DETAILED DESCRIPTION

[0061] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the specification of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0062] Unless otherwise specified, the raw materials and reagents used in the following examples are commercially available or can be prepared by known methods.

[0063] Please see the attached Figure 1 :

[0064] Example 1:

[0065] 1. Material composition:

[0066] Core-shell structure colorful stone-like micro-units:

[0067] The organic color core comprises the following components in parts by weight: 50 parts of solid matter of organic silicon modified acrylic emulsion; 8 parts of nano-scale inorganic pigment (for example, red iron oxide); 0.85 parts of nonionic wetting and dispersing agent; and 2.5 parts of inorganic functional shell of silicon dioxide.

[0068] The inorganic reflective heat-insulating lightweight base slurry comprises the following components in parts by weight:

[0069] Potassium silicate solution: 55 parts; active silica sol: 25 parts; geopolymer precursor powder (thermally activated metakaolin): 40 parts; solid base activator: 10 parts; high-efficiency synergistic reflective thermal insulation pigment filler (75 parts in total); high infrared reflective rutile nano-titanium dioxide: 42 parts; hollow glass microspheres: 33 parts; composite lightweight functional filler (35 parts in total); closed-cell expanded perlite powder: 17 parts; calcined kaolin: 18 parts; functional additives: 2.75 parts; water: 70 parts.

[0070] The addition amount of the core-shell structure colorful imitation stone micro-unit is: 40 parts relative to 100 parts of the inorganic reflective insulation lightweight base slurry.

[0071] 2. Preparation method:

[0072] S1. Preparation of colorful stone-like microunits with core-shell structure:

[0073] The solid matter of the organosilicon-modified acrylic emulsion, nano-scale inorganic pigment (iron oxide red) and non-ionic wetting and dispersing agent are uniformly mixed and formed by a spray drying granulation method to obtain organic color core particles with an average particle size of 275 microns.

[0074] The organic color core particles were taken and their surfaces were chemically grafted using 2.75 parts (relative to the dry weight of the organic color core particles) of a silane coupling agent.

[0075] Under the conditions of controlling the temperature at 42°C and the pH value at 9.75, the inorganic precursor containing ethyl orthosilicate is hydrolyzed and condensed on the surface of the functionalized pre-treated organic color core particles through the sol-gel method to form an inorganic functional shell layer of silica, the weight of which is 2.5 parts (relative to the total components of the organic color core) and the shell thickness is about 55nm.

[0076] S2. Preparation of inorganic reflective thermal insulation lightweight base slurry:

[0077] Mix potassium silicate solution, active silica sol, water and some functional additives (such as wetting agent, defoaming agent) evenly.

[0078] Under stirring, add the heat-activated metakaolin and solid alkali activator and mix them evenly.

[0079] High infrared reflective rutile nano-titanium dioxide (as the main pigment component) was added and dispersed at a high speed of 2250 rpm for 30 minutes to a fineness of ≤50 μm.

[0080] Subsequently, hollow glass microspheres, previously dispersed high infrared reflective rutile nano-titanium dioxide (ensure that it is evenly mixed with the lightweight filler added subsequently), closed-cell expanded perlite powder, calcined kaolin and remaining functional additives (such as thickeners) were added under stirring, and the mixture was stirred at a low speed of 550 rpm for 22 minutes. The slurry temperature was controlled not to exceed 45°C during the entire process.

[0081] S3. Composite coating: Add the core-shell structured colorful stone-like microunits prepared in step S1 (the addition amount is 40 parts relative to 100 parts of the base slurry prepared in step S2) to the inorganic reflective insulation lightweight base slurry prepared in step S2, and mix at a low shear stirring rate of 90 rpm for 20 minutes until uniform.

[0082] S4. Curing of the coating: After applying the coating prepared in step S3 to the base surface, perform natural curing at an ambient temperature of 20° C. for 14 days.

[0083] Example 2:

[0084] 1. Material composition:

[0085] Core-shell structure colorful stone-like micro-units:

[0086] The organic color core comprises the following components in parts by weight:

[0087] Solid matter of organosilicon-modified acrylic emulsion: 45 parts; nano-scale inorganic pigment (for example, yellow iron oxide): 1 part; non-ionic wetting and dispersing agent: 0.2 parts; inorganic functional shell layer is silicon dioxide: 0.1 parts.

[0088] The inorganic reflective heat-insulating lightweight base slurry comprises the following components in parts by weight:

[0089] Potassium silicate solution: 30 parts; active silica sol: 10 parts; geopolymer precursor powder (thermally activated metakaolin): 20 parts; solid base activator: 5 parts; high-efficiency synergistic reflective thermal insulation pigment filler (30 parts in total); high infrared reflective rutile nano-titanium dioxide: 15 parts; hollow glass microspheres: 15 parts; composite lightweight functional filler (10 parts in total); closed-cell expanded perlite powder: 5 parts; calcined kaolin: 5 parts; functional additives: 0.5 parts; water: 40 parts.

[0090] The addition amount of the core-shell structure colorful imitation stone micro-unit is: 20 parts relative to 100 parts of the inorganic reflective insulation lightweight base slurry.

[0091] 2. Preparation method:

[0092] S1. Preparation of colorful stone-like microunits with core-shell structure:

[0093] The solid matter of the organosilicon-modified acrylic emulsion, nano-scale inorganic pigment (iron oxide yellow) and non-ionic wetting and dispersing agent are uniformly mixed and formed by seed emulsion polymerization to obtain organic color core particles with an average particle size of 50 microns.

[0094] The organic color core particles are taken and their surfaces are chemically grafted using 0.5 parts (relative to the dry weight of the organic color core particles) of a silane coupling agent.

[0095] Under the conditions of controlling the temperature at 25°C and the pH value at 8.5, the inorganic precursor containing ethyl orthosilicate is hydrolyzed and condensed on the surface of the functionalized pre-treated organic color core particles through the sol-gel method to form an inorganic functional silica shell layer with a weight of 0.1 parts and a shell thickness of about 10 nm.

[0096] S2. Preparation of inorganic reflective thermal insulation lightweight base slurry:

[0097] Mix potassium silicate solution, active silica sol, water and some functional additives evenly.

[0098] Under stirring, add the heat-activated metakaolin and solid alkali activator and mix them evenly.

[0099] High infrared reflective rutile nano-titanium dioxide (as the main pigment component) was added and dispersed at a high speed of 1500 rpm for 20 minutes to a fineness of ≤50 μm.

[0100] Subsequently, hollow glass microspheres, previously dispersed high infrared reflective rutile nano-titanium dioxide, closed-cell expanded perlite powder, 5 parts of calcined kaolin and the remaining functional additives were added under stirring, and the mixture was stirred at a low speed of 300 rpm for 15 minutes. The slurry temperature was controlled not to exceed 45°C during the entire process.

[0101] S3. Composite coating: Add the core-shell structured colorful stone-like micro-units prepared in step S1 to the inorganic reflective heat-insulating lightweight base slurry prepared in step S2, and mix them at a low shear stirring rate of 30 rpm for 10 minutes until uniform.

[0102] S4. Curing of the coating: After applying the coating prepared in step S3 to the base surface, perform natural curing at an ambient temperature of 5° C. for 7 days.

[0103] Example 3:

[0104] 1. Material composition:

[0105] The organic color core comprises the following components in parts by weight: 55 parts of solid matter of organosilicon-modified acrylic emulsion; 15 parts of nano-scale inorganic pigment (for example, composite black pigment); 1.5 parts of nonionic wetting and dispersing agent; and 5 parts of inorganic functional shell layer of silicon dioxide.

[0106] The inorganic reflective heat-insulating lightweight base slurry comprises the following components in parts by weight: potassium silicate solution: 80 parts; active silica sol: 40 parts; geopolymer precursor powder (thermally activated metakaolin): 60 parts; solid alkali activator: 15 parts; high-efficiency synergistic reflective heat-insulating pigment filler (a total of 120 parts); high-infrared reflective rutile nano-titanium dioxide: 70 parts; hollow glass microspheres: 50 parts; composite lightweight functional filler (a total of 60 parts); closed-cell expanded perlite powder: 30 parts; calcined kaolin: 30 parts; functional additive: 5 parts; water: 100 parts; the added amount of core-shell structured colorful stone-like microunits is 60 parts relative to 100 parts of the inorganic reflective heat-insulating lightweight base slurry.

[0107] 2. Preparation method:

[0108] S1. Preparation of colorful stone-like microunits with core-shell structure:

[0109] 55 parts of solid matter of organosilicon-modified acrylic emulsion, nano-scale inorganic pigment (composite black pigment) and non-ionic wetting and dispersing agent were mixed evenly, and granulated by spray drying to obtain organic color core particles with an average particle size of 500 microns.

[0110] The organic color core particles were taken and their surfaces were chemically grafted using 5 parts of a silane coupling agent.

[0111] Under the conditions of controlling the temperature at 60°C and the pH value at 11.0, the inorganic precursor containing ethyl orthosilicate is hydrolyzed and condensed on the surface of the functionalized pre-treated organic color core particles through the sol-gel method to form an inorganic functional silica shell layer with a weight of 5 parts and a shell thickness of about 100 nm.

[0112] S2. Preparation of inorganic reflective thermal insulation lightweight base slurry:

[0113] Mix potassium silicate solution, active silica sol, water and some functional additives evenly.

[0114] Under stirring, add the heat-activated metakaolin and solid alkali activator and mix them evenly.

[0115] Add high infrared reflective rutile nano-titanium dioxide and disperse at a high speed of 3000 rpm for 40 minutes to make the fineness ≤50 μm.

[0116] Subsequently, hollow glass microspheres, previously dispersed high infrared reflective rutile nano-titanium dioxide, closed-cell expanded perlite powder, calcined kaolin and the remaining functional additives were added under stirring, and the mixture was stirred at a low speed of 800 rpm for 30 minutes. The slurry temperature was controlled not to exceed 45°C during the entire process.

[0117] S3. Composite coating: Add the core-shell structured colorful stone-like micro-units prepared in step S1 to the inorganic reflective heat-insulating lightweight base slurry prepared in step S2, and mix at a low shear stirring rate of 150 rpm for 30 minutes until uniform.

[0118] S4. Curing of the coating: After the coating prepared in step S3 is applied to the base surface, after the coating is surface-dried, auxiliary curing is performed at a CO2 concentration of 15% by volume and a temperature of 30°C for 48 hours.

[0119] Comparative Example 1: Compared with Example 1, the difference is that: no inorganic functional shell coating is performed, no subsequent silane coupling agent chemical grafting treatment and silica in-situ coating are performed, and the rest of the contents are the same as Example 1.

[0120] Comparative Example 2: Compared with Example 1, the difference is that the chemical grafting treatment of the organic color core particles with a silane coupling agent is omitted, and the rest of the contents are the same as those in Example 1.

[0121] Comparative Example 3: Compared with Example 1, the difference is that no geopolymer precursor powder and solid base activator are added, and the rest of the contents are the same as Example 1.

[0122] Comparative Example 4: Compared with Example 1, the difference is that no high infrared reflective rutile nano-titanium dioxide is added, and the rest of the contents are the same as Example 1.

[0123] Comparative Example 5: Compared with Example 1, the difference is that the programmed dispersion and mixing process is not adopted, and the rest of the contents are the same as Example 1.

[0124] Test Example 1:

[0125] Experimental materials and equipment:

[0126] Coating samples: coatings prepared according to the formulations and methods of Example 1, Comparative Example 1, and Comparative Example 2.

[0127] Substrate: 150mm×70mm×5mm standard cement fiber board, polish it flat with sandpaper before use, clean the surface with anhydrous ethanol, and dry it for later use.

[0128] Coating tool: wet film preparation device (scraper coater), which can control the wet film thickness to about 300μm.

[0129] Artificial climate aging test chamber: Xenon lamp aging test chamber that complies with ISO4892-2 or ASTMG155 standards.

[0130] Chemical reagents: 5% (v / v) hydrochloric acid (HCl) solution, 5% (w / v) sodium hydroxide (NaOH) solution, deionized water.

[0131] Test equipment:

[0132] Colorimeter (for measuring L*, a*, b* values).

[0133] Gloss meter (measures gloss at a 60° angle).

[0134] Constant temperature water bath.

[0135] Glass Petri dish.

[0136] Experimental steps:

[0137] Sample preparation: Take the coatings prepared in Example 1, Comparative Example 1, and Comparative Example 2, and stir them thoroughly.

[0138] Lay the clean and dry cement fiberboard flat, and use a wet film preparation device to apply each coating sample on the cement fiberboard, ensuring that the wet film thickness is consistent (about 300 μm).

[0139] Place the coated sample horizontally at room temperature (23±2°C) and relative humidity (50±5%) for 24 hours to dry, then transfer to standard curing conditions (20°C) and continue curing for 14 days until fully cured.

[0140] Comprehensive coating durability test:

[0141] Initial performance measurement: Select a fully cured sample from each sample group (Example 1, Comparative Example 1, Comparative Example 2) and use a colorimeter to measure the initial L * 0,a * 0,b * 0 value, use a gloss meter to measure its initial 60° gloss (G0). Record the initial appearance of the sample.

[0142] Aging process: Place the sample in a xenon lamp aging test chamber and set the aging conditions to: irradiance 0.51W / m 2 @340nm, blackboard temperature 65±3°C, chamber temperature 38±2°C, relative humidity 50±10%, cycle setting: 102 minutes light, 18 minutes light plus water spray. Total aging time is 1000 hours.

[0143] Performance evaluation after aging: After aging, take out the sample and place it in a standard environment for 24 hours. Measure the L * 1,a * 1,b * 1 value and 60° gloss (G1).

[0144] Calculating color difference Where: is the brightness value of the sample before aging or treatment; The red / green axis chromaticity index of the sample before aging or treatment (positive value is red, negative value is green); The yellow / blue axis chromaticity index of the sample before aging or treatment (positive value is yellow, negative value is blue); is the brightness value of the sample after aging or processing; The red / green axis chromaticity index of the sample after aging or treatment; The yellow / blue axis chromaticity index after sample aging or treatment

[0145] Calculate the light retention rate:

[0146] Visually inspect and record the coating surface for macro defects such as powdering, cracking, and blistering.

[0147] Chemical medium (acid, alkali) immersion test

[0148] New fully cured panels (without aging) were selected from each sample group.

[0149] Acid resistance test: Immerse half of the sample in a 5% (v / v) HCl solution, while the other half is exposed to air as a control. The immersion container is a glass petri dish. Immerse for 24 hours at room temperature (23±2°C).

[0150] Alkali resistance test: immerse half of another new sample in 5% (w / v) NaOH solution using the same method as above and soak at room temperature (23±2°C) for 24 hours.

[0151] Evaluation: After immersion, remove the sample and gently rinse the surface with deionized water. Dry with filter paper and place under standard conditions for 2 hours before observation. Compare the appearance of the soaked and unsoaked sections, noting any discoloration, gloss loss, blistering, softening, or shedding.

[0152] Water Resistance Test 1. Select new fully cured panels (without aging treatment) from each sample group.

[0153] The entire sample was completely immersed in a constant temperature water bath filled with deionized water, the water temperature was controlled at 23±2°C, and the immersion time was 240 hours.

[0154] Evaluation: After immersion, remove the sample, dry the surface with filter paper, and place it in a standard environment for 2 hours before observing. Record any discoloration, gloss loss, blistering, softening, or peeling on the coating surface. See Table 1 for test results.

[0155] Table 1: Evaluation data of the effect of core-shell structure on coating durability

[0156]

[0157]

[0158] From Table 1, we can get:

[0159] After 1000 hours of artificial weathering, the gloss retention (87.9%) and color difference ( 1.62) are significantly better than Comparative Example 1 (gloss retention rate 34.1%, 9.35) and Comparative Example 2 (gloss retention rate 65.1%, The silica shell layer formed a dense nanofilm on the surface of the organic color core through an in-situ sol-gel method, effectively acting as a physical barrier to directly erode the internal organic color core from aging factors such as ultraviolet rays, moisture, and oxygen, thereby significantly improving the coating's weather resistance. However, in Comparative Example 1, the organic color core was directly exposed due to the complete lack of this inorganic shell layer, resulting in rapid degradation under aging conditions, manifested as severe powdering, cracking, and dramatic changes in color and gloss.

[0160] In Example 1, the organic core was chemically grafted with a silane coupling agent before forming the silica shell, while Comparative Example 2 omitted this step. Although the silica shell also formed in Comparative Example 2, its gloss retention and color difference after aging were inferior to those of Example 1. It also exhibited more pronounced gloss loss and microbubbles in chemical and water resistance tests. This is consistent with the mechanistic analysis demonstrating that the silane coupling agent functions as a "molecular bridge": one end of the silane coupling agent reacts or entangles with the polymer on the surface of the organic core, while the other end condenses with the hydrolysis product of the inorganic silica precursor, thus forming a strong chemical bond between the organic core and the inorganic shell.

[0161] Test Example 2:

[0162] Experimental materials and equipment:

[0163] Coating samples: coatings prepared according to the formulations and methods of Example 1, Comparative Example 3, and Comparative Example 4.

[0164] Substrate:

[0165] For physical and mechanical properties and alkali resistance testing: 150mm×70mm×0.3mm tinplate, wipe clean with solvent before use.

[0166] For thermal insulation performance testing: 100mm×100mm×5mm standard cement board, clean and dry before use.

[0167] Coating tool: wet film preparation device (scraper coater), which can control the wet film thickness to about 300μm.

[0168] Test instruments and reagents:

[0169] Pencil hardness tester and matching drawing pencils (6B-6H).

[0170] A grid marker and adhesive tape that complies with ISO 2409 or ASTM D 3359.

[0171] 5% (w / v) sodium hydroxide (NaOH) solution.

[0172] Integrating sphere UV-Vis-NIR spectrophotometer.

[0173] 250W infrared lamp, bracket.

[0174] Non-contact infrared thermometer or surface thermocouple thermometer.

[0175] Timer.

[0176] Experimental steps:

[0177] Sample preparation:

[0178] Take the coatings prepared in Example 1, Comparative Example 3, and Comparative Example 4, and stir them thoroughly.

[0179] Physical and mechanical properties and alkali resistance sample: The coatings of Example 1 and Comparative Example 3 were respectively coated on clean tinplates, with a wet film thickness of about 300 μm.

[0180] Thermal insulation performance sample: The coatings of Example 1 and Comparative Example 4 were respectively applied on clean and dry standard cement boards, with a wet film thickness of about 300 μm.

[0181] All coated panels were placed horizontally at room temperature (23±2°C) and relative humidity (50±5%) for 24 hours to allow surface drying. They were then transferred to standard curing conditions (20°C) and cured for 14 days until fully cured. At least three parallel panels were prepared for each sample.

[0182] Coating physical mechanics and chemical resistance test (Example 1 vs. Comparative Example 3):

[0183] Pencil hardness test:

[0184] Fix the cured coating sample (tinplate) on a horizontal testing platform.

[0185] Choose a series of pencils of different hardness (from soft to hard, such as HB, F, H, 2H, etc.), sharpen the pencil lead until about 3mm is exposed, and grind the end surface on sandpaper.

[0186] Hold the pencil at an angle of about 45° and apply a force of about 7.5N to scratch the coating surface with a length of about 7mm.

[0187] Observe the scratches. The pencil hardness of the coating is defined as the hardest pencil rating that does not cause obvious permanent scratches or damage to the coating. Record the hardness value for each sample.

[0188] Adhesion test:

[0189] A grid pattern was cut on the surface of the cured coating film sample (tinplate) using a grid cutter (for films thicker than 125 μm, 6 cuts were usually used with a spacing of 2 mm).

[0190] Use a soft-bristle brush to remove debris from the cut area.

[0191] Apply the compliant tape firmly to the grid area and then quickly peel off the tape at approximately a 60° angle.

[0192] Adhesion is graded according to the percentage of coating shedding in the grid area (e.g., grade 0: smooth cut edges, no shedding within the grid;

[0193] Level 5: peeling area greater than 65%). Record the adhesion level of each sample.

[0194] Alkali resistance test:

[0195] Half of the cured coating sample (tinplate) was immersed in 5% (w / v) NaOH solution, and the other half was exposed to air as a comparison.

[0196] Soak at room temperature (23±2℃) for 48 hours.

[0197] After immersion, remove the sample, rinse the surface gently with deionized water, dry the water with filter paper, and place it in a standard environment for 2 hours before observation.

[0198] Record whether the coating has blistering, cracking, gloss loss, color change, softening or falling off when compared with the unimmersed part.

[0199] Coating thermal insulation performance test (Example 1 vs. Comparative Example 4):

[0200] Solar reflectance test:

[0201] The cured coating sample (cement board) was placed on the sample stage of an integrating sphere UV-visible-near infrared spectrophotometer.

[0202] Scanning in the wavelength range of 300nm to 2500nm, the spectral reflectance of the coating is measured.

[0203] The total solar reflectance (TSR) and the average reflectance in the near-infrared region (700-2500 nm) were calculated based on the spectral reflectance data.

[0204] Surface temperature rise comparison test:

[0205] Build the test device: Install a 250W infrared lamp vertically downward, with the lamp mouth about 30 cm away from the sample surface.

[0206] The coating sample plates (cement plates) of Example 1 and Comparative Example 4 were placed symmetrically side by side under an infrared lamp.

[0207] Record the initial surface temperature of the sample.

[0208] At the same time, turn on the infrared light to illuminate the sample and start timing.

[0209] After irradiation for 15 minutes, 30 minutes, and 60 minutes, respectively, a non-contact infrared thermometer was used to quickly measure and record the surface temperature of the central area of each sample.

[0210] Calculate the temperature rise value at each time point (current temperature - initial temperature).

[0211] Table 2: Data on the influence of inorganic base slurry composition on coating functionality and stability

[0212]

[0213] From Table 2, we can get:

[0214] The coating film of Example 1 exhibited higher pencil hardness (3H vs. sF) and better adhesion (grade 0 vs. grade 2). After immersion in a 5% NaOH solution for 48 hours, it showed only slight gloss loss, while the coating of Comparative Example 3 exhibited significant gloss loss, edge softening, and a small amount of microbubbles. This performance difference was primarily due to the lack of geopolymer precursor powder and solid alkali activator in Comparative Example 3. Geopolymers are three-dimensional inorganic polymer networks formed through the polycondensation reaction of aluminosilicate precursors under strong alkali activation. Their unique structure of alternating [SiO4] and [AlO4] tetrahedral units imparts high strength, excellent chemical stability (particularly alkali resistance), and good bonding properties.

[0215] The multi-component inorganic gelling system formed by potassium silicate, active silica sol and geopolymer in the base slurry of Example 1 constructs a denser and stronger matrix structure through the synergistic effect of each component, thereby significantly improving the hardness, adhesion and chemical corrosion resistance of the coating.

[0216] The total solar reflectance (TSR) of the coating in Example 1 is 0.81, the average near-infrared reflectivity is as high as 86.5%, and the surface temperature rise under 60 minutes of infrared lamp irradiation is only 15.8°C. In contrast, since Comparative Example 4 does not add high-infrared reflective rutile nano-titanium dioxide, its TSR drops to 0.53, the average near-infrared reflectivity is greatly reduced to 50.1%, and the surface temperature rise is as high as 28.3°C. This fully demonstrates the decisive contribution of high-infrared reflective rutile nano-titanium dioxide to the thermal insulation performance of the coating. The mechanism is that this specially treated nano-titanium dioxide has extremely high reflectivity for near-infrared radiation in the solar spectrum, and can effectively reflect most of the heat back to the atmosphere, thereby significantly reducing the coating's absorption of solar heat energy. Combined with the hollow glass microspheres in the base slurry (forming a static air layer through the internal cavity to hinder heat conduction), a highly efficient reflective heat insulation effect is achieved.

[0217] Test Example 3:

[0218] Experimental materials and equipment:

[0219] Paint / base slurry samples: inorganic reflective heat-insulating lightweight base slurry (hereinafter referred to as base slurry) prepared according to the formula and method of Example 1 and Comparative Example 5, and the finished paint products finally made from these base slurries.

[0220] Substrate:

[0221] For coating appearance and mechanical property testing: 150mm×70mm×0.3mm tinplate, wipe clean with solvent before use.

[0222] For fineness testing: bottom plate of scraper fineness gauge.

[0223] Coating tool: wet film preparation device (scraper coater), which can control the wet film thickness to about 300μm.

[0224] Test equipment and containers:

[0225] Scraper fineness meter (0-100μm or 0-50μm range).

[0226] Laboratory stirrer (used to simulate the mixing process of Comparative Example 5, if necessary to reproduce it, but mainly to compare the prepared samples).

[0227] Well-sealed wide-mouth glass or plastic bottles (for storage stability testing).

[0228] Constant temperature incubator or oven (for accelerated storage stability testing, optional).

[0229] Rotational viscometer (for measuring paint viscosity, optional).

[0230] Pencil hardness tester and matching drawing pencils (6B-6H).

[0231] A grid marker and adhesive tape that complies with ISO 2409 or ASTM D 3359.

[0232] Experimental steps:

[0233] Quality assessment of base slurry (wet slurry) and finished coating products:

[0234] Base slurry fineness test:

[0235] Take a small amount of fresh base slurry samples prepared in Example 1 and Comparative Example 5 respectively.

[0236] Place a few drops of the base slurry to be tested into the deep groove of the scraper fineness gauge, ensuring that the groove is filled and slightly overflows.

[0237] Use a scraper to scrape smoothly from the deep end to the shallow end of the groove at a constant speed and pressure. The scraper should be at a certain angle (usually 45°) to the surface of the fineness gauge.

[0238] Observe under appropriate light immediately after the scraper leaves the fineness meter (usually the reading is completed within 5-10 seconds).

[0239] The fineness value is based on the scale value corresponding to 3-5 consecutive particle scratches or dense particle points appearing on the scraper (μm). Each sample is tested at least three times and the average value is taken.

[0240] Coating storage stability test:

[0241] About 200 mL of the finished coatings prepared in Example 1 and Comparative Example 5 were respectively taken and placed into clean, dry, well-sealed containers, and the containers were filled to about 80% of their volume.

[0242] The samples were divided into two groups:

[0243] Storage at room temperature: Store at room temperature (23±2℃) away from light for 30 days.

[0244] Accelerated storage (optional): Place in a constant temperature incubator at (50±2)℃ for 7 days.

[0245] After the storage period expires, take out the sample, first restore it to room temperature (23±2°C) and keep it for at least 24 hours.

[0246] Before opening the lid, gently invert the container several times (to avoid shaking violently to produce bubbles), then open the lid and observe.

[0247] Assessment content:

[0248] Skin formation: Observe whether there is any skin formation on the liquid surface.

[0249] Sedimentation and stratification: Gently insert a glass rod into the bottom of the container to feel for any hard sediment. Observe the overall coating for any obvious stratification.

[0250] Gel: Observe whether the coating undergoes irreversible gelation.

[0251] Viscosity change: Measure the viscosity of the coating before and after storage and compare the rate of change. 6. Record the storage stability of each sample.

[0252] Final coating performance and appearance evaluation:

[0253] Observation of coating appearance and uniformity:

[0254] The coatings prepared in Example 1 and Comparative Example 5 (if the sample is in good condition after the storage stability test, the stored sample can be used, otherwise use a fresh sample) were fully stirred respectively.

[0255] The wet film was coated on a clean tinplate using a wet film preparation device, with a wet film thickness of about 300 μm.

[0256] Place it horizontally at room temperature (23±2℃) and relative humidity (50±5%) for 24 hours to allow the surface to dry, then transfer it to standard curing conditions (20℃) and continue curing for 7 days.

[0257] Evaluation: Visually observe and compare the coating flatness and color uniformity of the two sets of samples, and carefully check for obvious coarse particles, pinholes, blooming, sagging and other defects.

[0258] Comparison of simple mechanical properties of coatings:

[0259] The prepared and cured coating film samples were subjected to the following tests:

[0260] Pencil hardness test: The steps are the same as those in Test Example 2, and the hardness value of each sample is recorded.

[0261] Adhesion test: Follow the same steps as in Test Example 2 and record the adhesion level of each sample.

[0262] Table 3: Data on the impact of base slurry preparation process on product and coating quality

[0263]

[0264] From Table 3 we can get:

[0265] The base slurry prepared by the programmed dispersion and mixing process in Example 1 has a fineness of 35 μm, which is significantly better than the 78 μm of Comparative Example 5 (using a non-programmed mixing process). The base slurry fineness is an important indicator to measure the degree of dispersion of pigments and fillers in the system. A smaller fineness value means that the pigment and filler particles are finer and more evenly distributed. This excellent dispersion effect is due to the refined control of the characteristics of different components in the programmed process (such as high-speed dispersion of pigments and low-speed shearing of lightweight fillers), as well as the strict management of the slurry temperature. As mentioned above, sufficient and uniform dispersion can ensure that each particle is wetted and coated, avoiding the formation of agglomerates, thereby laying a good foundation for the stability of the subsequent coating and the performance of the coating film.

[0266] After 30 days of storage at room temperature, the coating of Example 1 exhibited only a slight soft precipitate and was easy to mix, with no noticeable skinning or delamination, demonstrating good storage stability. In contrast, the coating of Comparative Example 5 exhibited a thin surface skinning and a moderately hard precipitate, accompanied by slight delamination. This is primarily because the simple mixing method employed in Comparative Example 5 failed to effectively break up the original agglomeration of the pigments and fillers, nor to achieve a homogeneous or stable suspension of the components. During long-term standing, poorly dispersed heavier particles tend to settle to form a hard precipitate, while lighter components or the liquid phase may migrate, leading to delamination. Furthermore, some active components in an inhomogeneous system may undergo undesirable reactions at the interface, resulting in skinning.

[0267] The coating film produced from the base slurry of Example 1 was smooth and even in color, with no noticeable particles or smudges. It also exhibited good pencil hardness (2H) and adhesion (grade 0). The coating film of Comparative Example 5, on the other hand, had a small amount of fine particles on its surface, exhibited slightly poorer color uniformity, and its pencil hardness (HB) and adhesion (grade 1) were inferior to those of Example 1. This clearly demonstrates that agglomerated particles that are not fully dispersed in the base slurry can directly manifest themselves in the final coating film, causing cosmetic defects and potentially acting as stress concentration points, reducing the coating's mechanical properties and overall protective effectiveness.

[0268] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. An inorganic reflective heat-insulating lightweight ceramic stone paint, characterized in that: The ceramic colored stone paint comprises core-shell structure colorful imitation stone micro-units and inorganic reflective heat-insulating lightweight base slurry; The core-shell structured colorful stone-like micro-unit comprises an organic color core and an inorganic functional shell layer coated on the surface of the organic color core; The organic color core comprises the following components in parts by weight: Solid matter of silicone-modified acrylic emulsion: 45-55 parts; Nano-scale inorganic pigments: 1-15 parts; Nonionic wetting and dispersing agent: 0.2-1.5 parts; The inorganic functional shell layer is silicon dioxide: 0.1-5 parts; The inorganic reflective heat-insulating lightweight base slurry comprises the following components in parts by weight: Potassium silicate solution: 30-80 parts; Active silica sol: 10-40 parts; Geopolymer precursor powder: 20-60 parts; Solid base activator: 5-15 parts; High-efficiency synergistic reflective heat-insulating pigments and fillers: 30-120 parts; Composite lightweight functional filler: 10-60 parts; Functional additives: 0.5-5 parts; Water: 40-100 parts; The addition amount of the core-shell structure colorful imitation stone micro-unit is 20-60 parts relative to 100 parts of the inorganic reflective heat-insulating lightweight base slurry.

2. The inorganic reflective heat-insulating lightweight ceramic stone paint according to claim 1, characterized in that: The silicon dioxide of the inorganic functional shell layer forms a nano film with a thickness of 10-100 nm.

3. The inorganic reflective heat-insulating lightweight ceramic stone paint according to claim 1, characterized in that: The geopolymer precursor powder in the inorganic reflective heat-insulating lightweight base slurry is metakaolin that has been subjected to heat activation treatment.

4. The inorganic reflective heat-insulating lightweight ceramic stone paint according to claim 1, characterized in that: The high-efficiency synergistic reflective heat-insulating pigments and fillers in the inorganic reflective heat-insulating lightweight base slurry include the following components in parts by weight: High infrared reflective rutile nano-titanium dioxide: 15-70 parts; Hollow glass microspheres: 15-50 parts; The composite lightweight functional filler comprises the following components in parts by weight: Closed-cell expanded perlite powder: 5-30 parts; Calcined kaolin: 5-30 parts.

5. The inorganic reflective heat-insulating lightweight ceramic stone paint according to claim 1, characterized in that: The average particle size of the organic color core is 50-500 microns.

6. A method for preparing an inorganic reflective heat-insulating lightweight ceramic stone coating, characterized in that: The method for preparing the inorganic reflective heat-insulating lightweight ceramic stone coating according to any one of claims 1 to 5 comprises the following steps: S1. Preparation of colorful stone-like microunits with core-shell structure: A multi-step process is used to prepare colorful stone-like microunits with core-shell structure, which include an organic color core and a silica inorganic functional shell. S2. Preparation of inorganic reflective heat-insulating lightweight base slurry: mixing and evenly dispersing the components constituting the inorganic reflective heat-insulating lightweight base slurry; S3, compounding the coating: mixing the core-shell structured colorful stone-like micro-units prepared in step S1 with the inorganic reflective heat-insulating lightweight base slurry prepared in step S2 to form a coating; S4, paint curing: curing the paint formed in step S3.

7. The method for preparing an inorganic reflective heat-insulating lightweight ceramic stone coating according to claim 6, characterized in that: The preparation of the core-shell structure colorful stone-like micro-units comprises: The solid matter of the organosilicon-modified acrylic emulsion constituting the organic color core, the nano-scale inorganic pigment and the non-ionic wetting and dispersing agent are uniformly mixed, and then formed by spray drying granulation or seed emulsion polymerization to obtain organic color core particles with an average particle size of 50-500 microns; Using 0.5-5 parts of silane coupling agent to chemically graft the surface of the obtained organic color core particles; Under the conditions of controlling the temperature at 25-60°C and the pH value at 8.5-11.0, an inorganic precursor containing ethyl orthosilicate is hydrolyzed and condensed on the surface of the functionalized pre-treated organic color core particles by a sol-gel method to form an inorganic functional shell layer of silicon dioxide.

8. The method for preparing an inorganic reflective heat-insulating lightweight ceramic stone coating according to claim 6, characterized in that: The preparation of the inorganic reflective heat-insulating lightweight base slurry comprises: Potassium silicate solution, active silica sol, geopolymer precursor powder, solid alkali activator, high-efficiency synergistic reflective thermal insulation pigment filler, composite lightweight functional filler, functional additives and water are mixed and dispersed using a programmed dispersing and mixing process; The process includes dispersing the pigment components at a high speed of 1500-3000 rpm for 20-40 minutes to a fineness of ≤50 μm, adding hollow glass microspheres, high infrared reflective rutile nano-titanium dioxide, closed-cell expanded perlite powder and calcined kaolin, and stirring at a low speed of 300-800 rpm for 15-30 minutes. The slurry temperature is controlled not to exceed 45° C. during the entire process.

9. The method for preparing an inorganic reflective heat-insulating lightweight ceramic stone coating according to claim 6, characterized in that: The coating compound comprises: The core-shell structured colorful stone-like microunits prepared in step S1 are added to the inorganic reflective heat-insulating lightweight base slurry prepared in step S2, and mixed for 10-30 minutes at a low shear stirring rate of 30-150 rpm until uniform.

10. The method for preparing an inorganic reflective heat-insulating lightweight ceramic stone coating according to claim 6, characterized in that: The maintenance of the coating includes: After the coating prepared in step S3 is applied to the base surface, it is naturally cured at an ambient temperature of 5-35°C for 7-28 days, or after the coating is surface-dried, it is assisted cured at a CO2 concentration of 5-15% by volume and a temperature of 20-30°C for 12-48 hours.

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