Multifunctional reflective heat-insulation granite coating and preparation method thereof

Abstract

The invention relates to the field of reflective thermal insulation coatings, in particular to a multifunctional reflective thermal insulation granite coating and a preparation method thereof. The multifunctional reflective heat-insulation granite coating comprises the following raw materials in percentage by mass: 20-30% of main color base paint, 25-35% of color point base paint, 15-25% of a magnesium silicate lithium gel solution and 20-30% of a continuous phase solution. The granite coating prepared by the invention not only can simultaneously maintain excellent reflective insulation and decoration functions, but also can simultaneously maintain good waterproof property, weather resistance, corrosion resistance, coating mechanical property and other properties of the coating, and effectively combines the functions of a plurality of previous paints; the multifunctional reflective heat-insulation granite coating can meet the requirement of the existing building industry for high performance of an exterior wall coating, does not need a complex construction process of a conventional multilayer coating, greatly reduces the labor cost, has a better decorative effect, is rich in color, and has a very excellent application prospect.

Description

Technical Field

[0001] The present application relates to the field of reflective heat-insulating coatings, and in particular to a multifunctional reflective heat-insulating granite coating and a preparation method thereof. Background Art

[0002] With the development of the modern construction industry, higher requirements are placed on the functionality and environmental protection of building materials. Although traditional granite is widely used in the exterior wall decoration of buildings due to its unique texture and aesthetics, it has problems such as heavy weight, complex construction, high cost, and damage to the environment during mining. In addition, traditional granite materials do not have reflective insulation functions and cannot effectively reduce the temperature difference between the interior and exterior walls of buildings, which leads to increased air conditioning energy consumption.

[0003] In recent years, in order to overcome the above problems, a variety of imitation stone coatings have appeared on the market, such as real stone paint, rock flake imitation stone paint, etc. These coatings have the advantages of light weight, rich colors, and simple construction, but they are still lacking in reflective heat insulation performance, and it is difficult to achieve a visual effect with a similarity of more than 95% with natural granite. In addition, traditional imitation stone coatings are prone to color difference and insufficient weather resistance in long-term use, which affects the decorative effect and service life. On the other hand, ordinary waterproof coatings in existing paints do not have decorative functions, and ordinary water-based colorful granite coatings do not have waterproof functions. Therefore, the conventional construction process is to apply waterproof coatings to the exterior walls and then apply water-based colorful granite coatings to the exterior walls. The construction is relatively complicated, and overall lacks reflective heat insulation performance, and cannot save energy and reduce consumption, and control the temperature of the interior walls.

[0004] Therefore, in order to effectively solve the above problems, the present application provides a multifunctional reflective heat-insulating granite coating and a preparation method thereof. The granite coating prepared by the present application can not only maintain excellent reflective heat-insulating and decorative functions at the same time, but also maintain good waterproof, weather-resistant, corrosion-resistant and coating mechanical properties of the coating at the same time, and effectively compound the functions of various previous paints to form a multifunctional reflective heat-insulating granite coating that can meet the high-performance requirements of the existing construction industry for exterior wall coatings, and no longer requires the complex construction process of the previous multi-layer coatings, greatly reducing labor costs, and has better decorative effects and rich colors, thus having very excellent application prospects. Summary of the invention

[0005] In order to solve the above problems, the first aspect of the present application provides a multifunctional reflective heat-insulating granite paint. The raw materials, calculated by mass percentage, are: 20~30% main color base paint, 25~35% color point base paint, 15~25% magnesium silicate lithium gel solution, and 20~30% continuous phase solution.

[0006] As a preferred solution, the mass ratio of the main color base paint, the color point base paint and the magnesium silicate lithium gel solution is (22-28): (27-32): (18-22).

[0007] As a preferred solution, the mass ratio of the main color base paint, the color point base paint and the magnesium silicate lithium gel solution is (24-26): (28-30): (19-21).

[0008] As a preferred solution, the raw materials of the magnesium silicate lithium colloid solution are, by mass percentage, 0.1-0.3% anti-settling agent, 0.2-0.5% antibacterial agent, 4-6% magnesium silicate lithium, and the balance is supplemented by deionized water.

[0009] As a preferred solution, the anti-settling agent is at least one of hydroxyethyl cellulose, organic bentonite and fumed silica.

[0010] As a preferred solution, the anti-settling agent is hydroxyethyl cellulose.

[0011] As a preferred solution, the antibacterial agent is at least one of isothiazolinone, benzimidazole, benzisothiazolinone and dithiocyanomethane.

[0012] As a preferred solution, the antibacterial agent is isothiazolinone.

[0013] As a preferred solution, the main color base paint, in terms of mass percentage, comprises the following raw materials: 35-40% aqueous acrylic emulsion, 25-30% barium sulfate, 8-10% reflective heat insulating titanium dioxide, 3-6% reflective heat insulating color paste, 10.3-0.5% cellulose ether, 0.2-0.3% pH adjuster, 0.3-0.5% dispersant, 0.1-0.2% wetting agent, 0.3-0.5% defoamer, 10.3-0.5% rheological additive, 12-2.5% film-forming additive, 0.5-1% antifreeze agent, 0.2-0.3% polysiloxane, 0.3-0.5% mildew inhibitor, 0.1-0.2% antibacterial agent, 4-8% modified resin, and the balance is supplemented by deionized water.

[0014] As a preferred solution, the solid content of the aqueous acrylic emulsion is 45-52%, the viscosity is 2500-4000 mPa·s, and the temperature condition is 25°C.

[0015] As a preferred solution, the barium sulfate is ultrafine barium sulfate with an average particle size of 1.2-2 μm.

[0016] As a preferred solution, the reflective heat-insulating titanium dioxide is titanium dioxide W800.

[0017] As a preferred solution, the preparation method of the reflective heat-insulating color paste specifically includes the following steps: titanium dioxide W800, polyvinyl pyrrolidone, Tween 80, sodium hydroxyethyl cellulose, propylene glycol and sodium polyacrylate are mixed and added into a high-speed stirring kettle and finally deionized water is added, stirred at a speed of 2000-3000 rpm for 40-60 minutes until uniformly dispersed, then put into a sand mill for grinding, and pass through a 400-450 mesh sieve to remove large particles, and the result is obtained after completion.

[0018] As a preferred solution, the cellulose ether I is methyl hydroxyethyl cellulose.

[0019] As a preferred solution, the pH regulator is sodium hydroxide or ammonia water.

[0020] As a preferred solution, the dispersant is at least one of polycarboxylate dispersants.

[0021] As a preferred solution, the wetting agent is polyoxyethylene glyceryl tristearate or PEG-20 oleate.

[0022] As a preferred solution, the defoaming agent is any one of the organosilicon defoaming agents.

[0023] As a preferred solution, the rheological additive I is polyurethane or sodium polyacrylate.

[0024] As a preferred solution, the rheological additive I is sodium polyacrylate.

[0025] As a preferred solution, the film-forming aid I is dodecanol ester.

[0026] As a preferred solution, the antifreeze agent is a combination of ethylene glycol and propylene glycol.

[0027] As a preferred solution, the mass ratio of ethylene glycol to propylene glycol is (3-4): (1-1.2).

[0028] As a preferred solution, the polysiloxane is polydimethylsiloxane.

[0029] As a preferred solution, the mildew inhibitor is zinc pyrithione.

[0030] As a preferred solution, the antibacterial agent in the primary color base paint is consistent with the antibacterial agent in the magnesium lithium silicate gel solution.

[0031] As a preferred solution, the preparation method of the modified resin specifically includes the following steps: S1: adding isobornyl methacrylate, 2-ethylhexyl acrylate, hydroxyethyl methacrylate, 2-(perfluorooctyl)ethyl acrylate and vinyl tri(2-methoxyethoxy)silane to deionized water, and then adding sodium polycarboxylate, stirring and mixing to form a pre-emulsion; S2: taking part of the pre-emulsion and adding it to deionized water, adding ammonium persulfate, heating and keeping the temperature to react until a blue phase is generated; S3: adding ammonium persulfate a second time, adding the remaining pre-emulsion dropwise to the reaction system, and adding hydroquinone; S4: after the reaction is completed, the system is cooled, filtering the sieve to remove large particles, and storing the system in a sealed and heat-insulated manner to obtain the product.

[0032] As a preferred solution, the preparation method of the modified resin specifically includes the following steps: S1: adding isobornyl methacrylate, 2-ethylhexyl acrylate, hydroxyethyl methacrylate, 2-(perfluorooctyl)ethyl acrylate and vinyl tri(2-methoxyethoxy)silane to deionized water, then adding sodium polycarboxylate, stirring and mixing at a speed of 1000-1400 rpm to form a pre-emulsion; S2: taking 10wt% of the pre-emulsion and adding it to deionized water, then adding ammonium persulfate, heating to 75-80°C and keeping the temperature to react until a blue phase is generated; S3: adding ammonium persulfate for a second time, and adding the remaining pre-emulsion dropwise to the reaction system, controlling the dropping time to 2-3h, keeping the temperature to react for 2-3h after the dropping is completed, and adding hydroquinone; S4: after the reaction is completed, naturally cooling the system to 30-40°C, then filtering through a 400-500 mesh sieve to remove large particles, keeping the temperature and sealing to obtain the product.

[0033] As a preferred embodiment, the mass ratio of isobornyl methacrylate, 2-ethylhexyl acrylate, hydroxyethyl methacrylate, 2-(perfluorooctyl)ethyl acrylate and vinyl tri(2-methoxyethoxy)silane is (30-35):(15-20):(5-10):(2-5):(2-5).

[0034] As a preferred embodiment, the mass ratio of isobornyl methacrylate, 2-ethylhexyl acrylate, hydroxyethyl methacrylate, 2-(perfluorooctyl)ethyl acrylate and vinyl tri(2-methoxyethoxy)silane is (32-35):(16-18):(6-8):(3-4):(3-4).

[0035] As a preferred solution, the raw materials of the color dot base paint, measured by mass percentage, are: 25-30% water-based acrylic emulsion, 8-10% reflective heat-insulating titanium dioxide, 2-4% modified dispersant, 1.2-1.5% cellulose ether II, 0.1-0.2% pH adjuster, 0.3-0.5% defoamer, 1-2% antifreeze agent, 1-2% film-forming aid II, 0.2-0.3% antibacterial agent, and the balance is supplemented by deionized water.

[0036] As a preferred solution, the water-based acrylic emulsion in the color-point base paint is consistent with that in the main color base paint.

[0037] As a preferred solution, the reflective heat-insulating titanium dioxide in the color-dot base paint is consistent with that in the main color base paint.

[0038] As a preferred solution, the preparation method of the modified dispersant specifically includes the following steps: S1: adding polymethylhydrogensiloxane and acrylic acid into deionized water and stirring; S2: after the stirring is completed, polyethylene glycol 1000, ammonium persulfate, mercaptoethanol, phenoxyethyl acrylate and 2-ethylhexyl acrylate are added in sequence, and hydroquinone is added after heating and keeping the temperature; S3: after the reaction is completed, ammonia water is slowly added to adjust the pH value, cooling, and the product is sieved to obtain.

[0039] As a preferred solution, the preparation method of the modified dispersant specifically includes the following steps: S1: adding deionized water to a high-speed stirrer, adding polymethylhydrogensiloxane and acrylic acid at room temperature at a speed of 400-600 rpm, heating to 60-65°C, and stirring at a speed of 600-800 rpm for 30-40 min; S2: after the stirring is completed, polyethylene glycol 1000, ammonium persulfate and mercaptoethanol are added in sequence, stirring at a speed of 400-600 rpm for 10-15 min each time, then adding phenoxyethyl acrylate and 2-ethylhexyl acrylate in sequence and continuing to stir for 30-35 min, heating to 80-85°C after the stirring is completed, keeping the temperature for reaction for 3-4 hours, and adding hydroquinone; S3: after the reaction is completed, slowly adding ammonia water, controlling the pH value of the system to 7.5-8, then naturally cooling to room temperature, filtering the product through a 500-600 mesh sieve, and obtaining the product after completion.

[0040] As a preferred solution, the mass ratio of the polymethylhydrogensiloxane, acrylic acid and polyethylene glycol 1000 is (5-8): (30-35): (3-4).

[0041] As a preferred solution, the mass ratio of acrylic acid, phenoxyethyl acrylate and 2-ethylhexyl acrylate is (30-35): (8-10): (3-4).

[0042] In the present application, by adding the above-mentioned modified dispersant, the multi-hydrophobic long chains can be used to achieve the barrier effect on water molecules inside the paint system, and the penetration path of water molecules can be greatly improved through a denser molecular chain segment network and the viscosity between molecular chains. When external force and moisture act, the stronger viscosity between molecular chains can greatly enhance the resistance of the coating system to the slippage of molecular chains, and thus during the long-term external use of the paint, the probability of the formation of a surface hydration layer can be greatly reduced, and the probability of penetration can be reduced. Moreover, through the impedance effect on the slippage of molecular chains, good crack resistance can be maintained during long-term use, or cracks can be maintained in a silver streak state, reducing the continuous phase voids caused by cracks inside, thereby maintaining the coating with long-term weather resistance, waterproofness and corrosion resistance, and having excellent mechanical properties.

[0043] As a preferred solution, the cellulose ether II is sodium methyl hydroxypropyl cellulose.

[0044] As a preferred solution, the pH adjuster in the color dot base paint is consistent with that in the main color base paint.

[0045] As a preferred solution, the defoamer in the color point base paint is consistent with that in the main color base paint.

[0046] As a preferred solution, the antifreeze agent in the color dot base paint is consistent with that in the main color base paint.

[0047] As a preferred solution, the film-forming aid II is hexadecyl alcohol ester.

[0048] As a preferred solution, the antibacterial agent in the color-dot base paint is consistent with that in the main color base paint.

[0049] As a preferred solution, the continuous phase solution comprises, by mass percentage, 40-50% aqueous acrylic emulsion, 0.2-0.3% pH adjuster, 2-4% film-forming aid III, 0.2-1% rheological aid II, 0.2-0.3% antibacterial agent, 0.2-0.5% defoamer, and the balance is made up of deionized water.

[0050] As a preferred solution, in the continuous phase solution, the aqueous acrylic emulsion is consistent with that in the primary color base paint.

[0051] As a preferred solution, the pH adjuster in the continuous phase solution is consistent with that in the main color base paint.

[0052] As a preferred solution, the defoaming agent in the continuous phase solution is consistent with that in the main color base paint.

[0053] As a preferred solution, the antibacterial agent in the continuous phase solution is consistent with that in the main color base paint.

[0054] As a preferred solution, the film-forming aid III is dodecyl alcohol ester or hexadecanol ester.

[0055] As a preferred solution, the film-forming aid III is dodecanol ester.

[0056] As a preferred solution, the rheological additive II is at least one polyurethane rheological additive.

[0057] The second aspect of the present application provides a method for preparing the above-mentioned multifunctional reflective heat-insulating granite coating, which specifically comprises the following steps: S1: adding the raw materials of the main color base paint to a high-speed stirring container, stirring at a speed of 1200-2000 rpm until uniform, to obtain the main color base paint for standby use; S2: adding the required raw materials of magnesium silicate lithium gel solution, color dot base paint and continuous phase solution to three high-speed stirring containers respectively, and stirring at a speed of 1200-2000 rpm until uniform magnesium silicate lithium gel solution, color dot base paint and continuous phase solution are obtained; S3: mixing and granulating the color dot base paint in the magnesium silicate lithium gel solution to obtain color dots, and then mixing with the continuous phase solution in proportion to obtain color dot paint; S4: first spraying the main color base paint and ventilating and drying for 5-7 hours, and then spraying the color dot paint on the surface of the main color base paint, and after drying and curing, the coating is obtained.

[0058] The beneficial effects of this application are: 1. The multifunctional reflective heat-insulating granite coating provided in the present application can not only maintain excellent reflective heat-insulating and decorative functions at the same time, but also maintain good waterproof, weather-resistant, corrosion-resistant and coating mechanical properties of the coating at the same time. The functions of various previous paints are effectively compounded to form a multifunctional reflective heat-insulating granite coating that can meet the high-performance requirements of the existing construction industry for exterior wall coatings, and no longer requires the complex construction process of the previous multi-layer coatings, which greatly reduces labor costs, and has better decorative effects and rich colors, thus having very excellent application prospects.

[0059] 2. A multifunctional reflective heat-insulating granite coating provided in the present application, wherein the modified dispersant added therein can achieve a barrier effect on water molecules inside the paint system by virtue of its multi-hydrophobic long chains, and greatly improve the penetration path of water molecules through a denser molecular chain segment network and viscosity between molecular chains, and when subjected to external force and moisture, the stronger viscosity between molecular chains can greatly enhance the resistance of the coating system to molecular chain slippage, thereby greatly reducing the probability of the formation of a surface hydration layer and the probability of penetration during long-term external use of the paint, and through the impedance effect on molecular chain slippage, it can always maintain good crack resistance during long-term use, or maintain cracks in a silver streak state, reduce the continuous phase voids generated internally by cracks, thereby maintaining the coating with long-term weather resistance, waterproofness and corrosion resistance, and having excellent mechanical properties.

[0060] 3. The multifunctional reflective heat-insulating granite coating provided in the present application has a modified resin raw material added thereto that can realize a through-connection of the internal cross-linking system in the main color base paint, thereby greatly increasing the tightness between internal molecules, enhancing steric hindrance, and reducing the probability of side reactions in the system. On the other hand, it can also reduce the pore size of the vibration pores of the solid particles in the coating system, avoiding the connection of large continuous voids to form regional large pores, thereby ensuring the performance stability of the coating in long-term use, and helping to improve its water resistance, reflective heat insulation, mechanical properties, and weather resistance. DETAILED DESCRIPTION

[0061] The following will further explain and demonstrate the technical solutions in the above invention content of this application in the form of specific implementation schemes. The following embodiments are only practical examples used to illustrate and explain the contents of the technical solutions in the specification, and should not limit the scope of the claims to be protected by this application. All technical products based on the technical solutions described in the invention content of this application should be included in the scope to be protected by this application.

[0062] In the following examples, unless otherwise specified, the raw materials are all commercially available products, or can be prepared by methods well known to those skilled in the art.

[0063] Example 1 Embodiment 1 The first aspect provides a multifunctional reflective heat-insulating granite paint, and the raw materials are, by mass percentage: 25.2% of main color base paint, 29.8% of color point base paint, 20.5% of magnesium silicate lithium gel solution, and 24.5% of continuous phase solution.

[0064] The raw materials of lithium magnesium silicate gel solution, calculated by mass percentage, are: 0.2% anti-settling agent, 0.28% anti-bacterial agent, 5.5% lithium magnesium silicate, and the balance is supplemented by deionized water.

[0065] The anti-settling agent is hydroxyethyl cellulose; the antibacterial agent is isothiazolinone.

[0066] The main color base paint, calculated in percentage by mass, has the following raw materials: 38% water-based acrylic emulsion, 26.5% barium sulfate, 8.8% reflective thermal insulation titanium dioxide, 5.5% reflective thermal insulation color paste, 0.42% cellulose ether, 0.25% pH adjuster, 0.44% dispersant, 0.16% wetting agent, 0.33% defoamer, 0.36% rheological additive, 2.2% film-forming additive, 0.8% antifreeze agent, 0.2% polysiloxane, 0.4% mildew inhibitor, 0.1% antibacterial agent, 7.5% modified resin, and deionized water to make up the balance.

[0067] The water-based acrylic emulsion has a solid content of 48%, a viscosity of 2500 mPa·s, and a temperature condition of 25° C. The product is AcronalProof 1108S purchased from BASF (China) Co., Ltd.

[0068] The barium sulfate is ultrafine barium sulfate with an average particle size of 1.6 μm.

[0069] The reflective heat-insulating titanium dioxide is titanium dioxide W800.

[0070] The preparation method of the reflective heat-insulating color paste specifically includes the following steps, calculated by mass: 22.5 parts of titanium dioxide W800, 3.2 parts of polyvinyl pyrrolidone, 1.2 parts of Tween 80, 0.8 parts of sodium hydroxyethyl cellulose, 0.6 parts of propylene glycol and 2.2 parts of sodium polyacrylate are mixed and added into a high-speed stirring kettle and finally 50 parts of deionized water are added, stirred at a speed of 2000 rpm for 50 minutes until uniformly dispersed, and then put into a sand mill for grinding, and large particles are removed through a 450-mesh sieve to obtain the product after completion.

[0071] Polyvinyl pyrrolidone was purchased from the polyvinyl pyrrolidone K30 product sold by Zhongshan Dixin Chemical Co., Ltd.

[0072] Cellulose ether I is methyl hydroxyethyl cellulose; the pH adjuster is ammonia water; the dispersant is a polycarboxylate dispersant, purchased from BASF, Germany, model CX4320AM; the wetting agent is PEG-20 oleate; and the defoaming agent is silicone defoaming agent BYK-066N.

[0073] Rheological additive I is sodium polyacrylate, purchased from Dow Chemical (Shanghai) Co., Ltd., USA, model TT-935; film-forming additive I is dodecyl alcohol ester.

[0074] The antifreeze agent is a composition of ethylene glycol and propylene glycol, and the mass ratio of the two is 3.5:1.1.

[0075] The polysiloxane was polydimethylsiloxane, which was purchased from the industrial grade product sold by Jinan Yingyu Chemical Co., Ltd., China.

[0076] The mildew preventer is zinc pyrithione; the antibacterial agent in the primary color base paint is the same as the antibacterial agent in the magnesium silicate lithium colloid solution.

[0077] The preparation method of the modified resin specifically comprises the following steps, calculated by mass: S1: 34 parts of isobornyl methacrylate, 16.5 parts of 2-ethylhexyl acrylate, 7 parts of hydroxyethyl methacrylate, 3.2 parts of 2-(perfluorooctyl)ethyl acrylate and 3.5 parts of vinyl tris(2-methoxyethoxy)silane are mixed and added to 160 parts of deionized water, and then 2.1 parts of sodium polycarboxylate are added, and the mixture is stirred at a speed of 1200 rpm to form a pre-emulsion; S2: 10w t% of the pre-emulsion is added to 280 parts of deionized water, and then 0.04 parts of ammonium persulfate are added, and the temperature is raised to 80°C and kept warm for reaction until a blue phase is generated; S3: 0.3 parts of ammonium persulfate are added for the second time, and the remaining pre-emulsion is added dropwise to the reaction system, and the dropping time is controlled to be 2h. After the dropping is completed, the reaction is kept warm for 2.5h, and 0.21 parts of hydroquinone are added; S4: After the reaction is completed, the system is naturally cooled to 35°C, and then filtered through a 450-mesh sieve to remove large particles, and stored in a sealed and heat-insulated manner.

[0078] The raw materials of the color dot base paint, calculated by mass percentage, are: 28.2% water-based acrylic emulsion, 8.5% reflective heat-insulating titanium dioxide, 3.5% modified dispersant, 1.3% cellulose ether II, 0.2% pH adjuster, 0.4% defoamer, 1.6% antifreeze agent, 1.4% film-forming aid II, 0.3% antibacterial agent, and the balance is made up of deionized water.

[0079] The water-based acrylic emulsion in the color-point base paint is the same as that in the main color base paint.

[0080] In the color dot base paint, the reflective heat-insulating titanium dioxide is the same as that in the main color base paint.

[0081] The preparation method of the modified dispersant specifically includes the following steps, calculated by mass: S1: adding 200 parts of deionized water to a high-speed stirrer, adding 6.5 parts of polymethylhydrogensiloxane and 32.5 parts of acrylic acid at room temperature at a rotation speed of 400-600 rpm, heating to 65°C, and stirring at a speed of 600 rpm for 35 minutes; S2: after the stirring is completed, 3.2 parts of polyethylene glycol 1000, 0.6 parts of ammonium persulfate and 0.2 parts of mercaptoethanol are added in sequence, stirring at a speed of 400 rpm for 12 minutes each time, then 9.4 parts of phenoxyethyl acrylate and 3.2 parts of 2-ethylhexyl acrylate are added in sequence and stirring is continued for 30 minutes, after the stirring is completed, the temperature is raised to 80°C, the reaction is kept warm for 3 hours, and 0.26 parts of hydroquinone are added; S3: after the reaction is completed, ammonia water is slowly added to control the pH value of the system to 7.5, then naturally cooled to room temperature, the product is filtered through a 500-mesh sieve, and the product is obtained after completion.

[0082] Cellulose ether II is sodium methyl hydroxypropyl cellulose.

[0083] The pH adjuster in the color spot base paint is the same as that in the main color base paint.

[0084] The defoamer in the color-point base paint is the same as that in the main color base paint.

[0085] The antifreeze agent in the color spot base paint is the same as that in the main color base paint.

[0086] The film-forming aid II is hexadecyl alcohol ester.

[0087] The antibacterial agent in the color-dot base paint is the same as that in the main color base paint.

[0088] The continuous phase solution, in terms of mass percentage, comprises the following raw materials: 48.5% aqueous acrylic emulsion, 0.3% pH adjuster, 2.5% film-forming aid III, 0.8% rheological aid II, 0.2% antibacterial agent, 0.3% defoaming agent, and the balance is made up of deionized water.

[0089] In the continuous phase solution, the water-based acrylic emulsion is consistent with the primary color base paint.

[0090] In the continuous phase solution, the pH adjuster is consistent with that in the main color base paint.

[0091] In the continuous phase solution, the defoamer is the same as that in the main color base paint.

[0092] In the continuous phase solution, the antibacterial agent is consistent with that in the main color base paint.

[0093] The film-forming agent III is dodecanol ester; the rheological agent II is a polyurethane rheological agent product of model PU1191 sold by BASF (China) Co., Ltd.

[0094] The second aspect of the present embodiment provides a preparation method of the above-mentioned multifunctional reflective heat-insulating granite coating, which specifically includes the following steps: S1: adding the raw materials of the main color base paint to a high-speed stirring container, stirring at a speed of 1600 rpm until uniform, to obtain the main color base paint for standby use; S2: adding the required raw materials of magnesium silicate lithium gel solution, color point base paint and continuous phase solution to three high-speed stirring containers respectively, and stirring at a speed of 1200-2000 rpm until uniform magnesium silicate lithium gel solution, color point base paint and continuous phase solution are obtained; S3: mixing and granulating the color point base paint in the magnesium silicate lithium gel solution to obtain color points, and then mixing with the continuous phase solution in proportion to obtain color point paint; S4: first spraying the main color base paint and ventilating and drying for 6 hours, and then spraying the color point paint on the surface of the main color base paint, and after drying and curing, the coating is obtained.

[0095] Example 2 The specific implementation of this comparative example is basically the same as that of Example 1, except that the multifunctional reflective heat-insulating granite paint has the following raw materials, by mass percentage: 28% of main color base paint, 28.5% of color point base paint, 18.5% of magnesium silicate lithium gel solution, and 25% of continuous phase solution.

[0096] Example 3 The specific implementation of this comparative example is basically the same as that of Example 1, except that the multifunctional reflective heat-insulating granite paint has the following raw materials, by mass percentage: 23.5% of main color base paint, 28.5% of color point base paint, 22% of magnesium silicate lithium gel solution, and 26% of continuous phase solution.

[0097] Comparative Example 1 The specific implementation manner of this comparative example is basically the same as that of Example 1, except that: the main color base paint, in terms of mass percentage, the raw materials are: 42.5% water-based acrylic emulsion, 30.5% barium sulfate, 10.5% reflective heat-insulating titanium dioxide, 5.5% reflective heat-insulating color paste, 0.42% cellulose ether, 0.25% pH adjuster, 0.44% dispersant, 0.16% wetting agent, 0.33% defoamer, 0.36% rheological additive, 2.2% film-forming additive, 0.8% antifreeze agent, 0.2% polysiloxane, 0.4% mildew inhibitor, 0.1% antibacterial agent, 2% modified resin, and deionized water to make up the balance.

[0098] Comparative Example 2 The specific implementation manner of this comparative example is basically the same as that of Example 1, except that: the main color base paint, in terms of mass percentage, the raw materials are: 42.5% water-based acrylic emulsion, 30.5% barium sulfate, 6% reflective heat-insulating titanium dioxide, 5.5% reflective heat-insulating color paste, 0.42% cellulose ether, 0.25% pH adjuster, 0.44% dispersant, 0.16% wetting agent, 0.33% defoamer, 0.36% rheological additive, 12.2% film-forming additive, 0.8% antifreeze agent, 0.2% polysiloxane, 0.4% mildew inhibitor, 0.1% antibacterial agent, 10% modified resin, and deionized water to make up the balance.

[0099] Comparative Example 3 The specific implementation of this comparative example is basically the same as that of Example 1, except that: the raw materials of the color point base paint, in terms of mass percentage, are: 32.5% water-based acrylic emulsion, 12% reflective heat-insulating titanium dioxide, 1.2% modified dispersant, 1.3% cellulose ether II, 0.2% pH adjuster, 0.4% defoamer, 1.6% antifreeze agent, 1.4% film-forming aid II, 0.3% antibacterial agent, and the balance is supplemented by deionized water.

[0100] Comparative Example 4 The specific implementation of this comparative example is basically the same as that of Example 1, except that: the preparation method of the modified resin specifically comprises the following steps, calculated by mass: S1: 45 parts of isobornyl methacrylate, 8.5 parts of 2-ethylhexyl acrylate, 2 parts of hydroxyethyl methacrylate and 1.5 parts of 2-(perfluorooctyl)ethyl acrylate are mixed and added to 160 parts of deionized water, and then 2.1 parts of sodium polycarboxylate are added, and the mixture is stirred and mixed at a speed of 1200 rpm to form a pre-emulsion; S2: Take 10wt% of the pre-emulsion and add it to 280 parts of deionized water, then add 0.04 parts of ammonium persulfate, heat to 80°C and keep warm to react until a blue phase is generated; S3: add 0.3 parts of ammonium persulfate for the second time, and add the remaining pre-emulsion dropwise to the reaction system, control the dropping time to 2h, keep warm to react for 2.5h after the dropping is completed, and add 0.21 parts of hydroquinone; S4: after the reaction is completed, naturally cool the system to 35°C, then filter through a 450-mesh sieve to remove large particles, keep warm and seal, and obtain.

[0101] Comparative Example 5 The specific implementation of this comparative example is basically the same as that of Example 1, except that: the preparation method of the modified resin specifically comprises the following steps, calculated by mass: S1: 15.5 parts of isobornyl methacrylate, 22.5 parts of 2-ethylhexyl acrylate, 15 parts of hydroxyethyl methacrylate and 1.8 parts of vinyl tris(2-methoxyethoxy)silane are mixed and added to 160 parts of deionized water, and then 2.1 parts of sodium polycarboxylate are added, and the mixture is stirred and mixed at a speed of 1200 rpm to form a pre-emulsion; S2: Take 10wt% of the pre-emulsion and add it into 280 parts of deionized water, then add 0.04 parts of ammonium persulfate, heat to 80℃ and keep warm to react until a blue phase is generated; S3: Add 0.3 parts of ammonium persulfate for the second time, and add the remaining pre-emulsion dropwise into the reaction system, control the dropping time to 2h, keep warm to react for 2.5h after the dropping is completed, and add 0.21 parts of hydroquinone; S4: After the reaction is completed, cool the system naturally to 35℃, then filter with a 450-mesh sieve to remove large particles, keep warm and seal, and obtain the product.

[0102] Comparative Example 6 The specific implementation of this comparative example is basically the same as that of Example 1, except that: the preparation method of the modified dispersant specifically includes the following steps, calculated by mass: S1: add 200 parts of deionized water to a high-speed stirrer, add 10.5 parts of polymethylhydrogensiloxane and 15.5 parts of acrylic acid at room temperature at a speed of 400-600 rpm, heat to 65°C, and stir at a speed of 600 rpm for 35 minutes; S2: after the stirring is completed, add 3.2 parts of polyethylene glycol 1000, 0.6 parts of supernatant, and 10.5 parts of styrene. Ammonium sulfate and 0.2 parts of mercaptoethanol are added each time and stirred at 400 rpm for 12 minutes, then 9.4 parts of phenoxyethyl acrylate and 3.2 parts of 2-ethylhexyl acrylate are added in sequence and stirred for 30 minutes. After stirring, the temperature is raised to 80°C and kept for reaction for 3 hours, and 0.26 parts of hydroquinone are added; S3: after the reaction is completed, ammonia water is slowly added to control the pH value of the system to 7.5, and then naturally cooled to room temperature. The product is filtered through a 500-mesh sieve and washed with deionized water for 3 times. After completion, it is obtained.

[0103] Comparative Example 7 The specific implementation of this comparative example is basically the same as that of Example 1, except that: the preparation method of the modified dispersant specifically includes the following steps, calculated by mass: S1: add 200 parts of deionized water to a high-speed stirrer, add 6.5 parts of polymethylhydrogensiloxane and 32.5 parts of acrylic acid at room temperature at a speed of 400-600 rpm, heat to 65°C, and stir at 600 rpm for 35 minutes; S2: after stirring, add 3.2 parts of polyethylene glycol 1000, 0.6 parts of Ammonium persulfate and 0.2 parts of mercaptoethanol are added each time and stirred at 400 rpm for 12 minutes, then 3 parts of phenoxyethyl acrylate and 1.5 parts of 2-ethylhexyl acrylate are added in sequence and stirred for 30 minutes. After stirring, the temperature is raised to 80°C and the reaction is kept warm for 3 hours, and 0.26 parts of hydroquinone are added; S3: after the reaction is completed, ammonia water is slowly added to control the pH value of the system to 7.5, and then naturally cooled to room temperature. The product is filtered through a 500-mesh sieve and washed with deionized water for 3 times. After completion, it is obtained.

[0104] Performance Evaluation Waterproof test: refer to standard JC / T864-2023 to test the water resistance of the products obtained in the embodiments and comparative examples. The test pressure is 0.3 MPa. It is necessary to maintain no water leakage under this pressure for 6 hours. If there is water leakage, it is recorded as unqualified, otherwise it is qualified. 100 samples are tested in each group, and the qualified rate results are recorded in Table 1.

[0105] Solar reflectivity test: The solar reflectivity test was performed on the products obtained in the examples and comparative examples with reference to the standard JG / T235-2014. The test values ​​were averaged from 10 tests and recorded in Table 1.

[0106] Near infrared reflectivity test: The near infrared reflectivity test was performed on the products obtained in the examples and comparative examples with reference to the standard JG / T235-2014. The test values ​​were averaged from 10 tests and recorded in Table 1.

[0107] Anti-fouling test: The anti-fouling test was performed on the products obtained in the examples and comparative examples with reference to standard HG / T4343-2024, and the grade results are recorded in Table 1.

[0108] It can be seen from the examples and comparative examples of the present application and the data results in Table 1 that examples 1 to 3 of the present application have obvious advantages over comparative examples 1 to 7 in terms of waterproof performance, reflective heat insulation performance and stain resistance. This is mainly because the modified dispersant with the best performance and ratio added in the examples of the present application helps to form a denser molecular chain segment network and viscosity between molecular chains, greatly improving the penetration path of water molecules, and when external force and moisture act, the stronger viscosity between molecular chains can greatly enhance the resistance of the coating system to molecular chain slippage; on the other hand, the modified resin raw material can realize the through connection of the internal cross-linking system in the main color base paint, thereby greatly increasing the tightness between internal molecules, enhancing steric hindrance, and reducing the probability of side reactions in the system, and on the other hand, it can also reduce the pore size of the vibration pores of the solid particles in the coating system, avoiding the connection of large continuous voids to form regional large pores, thereby ensuring the performance stability of the coating in long-term use, and helping to improve its water resistance, reflective heat insulation, mechanical mechanical properties and weather resistance.

Claims

1. A multifunctional reflective heat-insulating granite coating, characterized in that: In terms of mass percentage, the raw materials of the multifunctional reflective heat-insulating granite coating are: 20-30% of the main color base paint, 25-35% of the color point base paint, 15-25% of the magnesium silicate lithium gel solution, and 20-30% of the continuous phase solution; The raw materials of the lithium magnesium silicate gel solution include: 0.1-0.3% anti-settling agent, 0.2-0.5% anti-bacterial agent, 4-6% lithium magnesium silicate, and deionized water to make up the balance; The raw materials of the primary color base paint include: 35-40% water-based acrylic emulsion, 4-8% modified resin, and deionized water to supplement the balance; The raw materials of the color dot base paint include: 25-30% water-based acrylic emulsion, 8-10% reflective heat-insulating titanium dioxide, 2-4% modified dispersant, and deionized water to supplement the balance; The raw materials of the continuous phase solution include: 40-50% aqueous acrylic emulsion and the balance made up by deionized water; The preparation method of the modified dispersant comprises: S1: adding polymethyl hydrogen siloxane and acrylic acid into deionized water and stirring; S2: after the stirring is completed, polyethylene glycol 1000, ammonium persulfate, mercaptoethanol, phenoxyethyl acrylate and 2-ethylhexyl acrylate are added in sequence, heating and keeping the temperature, and then adding hydroquinone; S3: after the reaction is completed, slowly adding ammonia water to adjust the pH value, cooling, and sieving the product to obtain; The preparation method of the modified resin comprises: S1: adding isobornyl methacrylate, 2-ethylhexyl acrylate, hydroxyethyl methacrylate, 2-(perfluorooctyl)ethyl acrylate and vinyl tri(2-methoxyethoxy)silane to deionized water, adding sodium polycarboxylate, and stirring to form a pre-emulsion; S2: adding part of the pre-emulsion to deionized water, adding ammonium persulfate, heating and keeping the temperature to react until a blue phase is generated; S3: adding ammonium persulfate for a second time, adding the remaining pre-emulsion dropwise to the reaction system, and adding hydroquinone; S4: cooling the system after the reaction is completed, filtering the screen to remove large particles, and keeping the temperature and sealing to obtain the modified resin.

2. The multifunctional reflective heat-insulating granite coating according to claim 1 is characterized in that: The mass ratio of the polymethylhydrogensiloxane, acrylic acid and polyethylene glycol 1000 is (5-8): (30-35): (3-4).

3. The multifunctional reflective heat-insulating granite coating according to claim 2 is characterized in that: The mass ratio of acrylic acid, phenoxyethyl acrylate and 2-ethylhexyl acrylate is (30-35): (8-10): (3-4).

4. The multifunctional reflective heat-insulating granite coating according to claim 3 is characterized in that: The mass ratio of the main color base paint, the color point base paint and the magnesium silicate lithium gel solution is (22-28): (27-32): (18-22).

5. The multifunctional reflective heat-insulating granite paint according to claim 4 is characterized in that: In terms of mass percentage, the raw materials of the main color base paint also include: 25-30% barium sulfate, 8-10% reflective heat insulation titanium dioxide, 3-6% reflective heat insulation color paste, 10.3-0.5% cellulose ether, 0.2-0.3% pH adjuster, 0.3-0.5% dispersant, 0.1-0.2% wetting agent, 0.3-0.5% defoamer, 10.3-0.5% rheological additive, 12-2.5% film-forming additive, 0.5-1% antifreeze agent, 0.2-0.3% polysiloxane, 0.3-0.5% mildew inhibitor, 0.1-0.2% antibacterial agent; And / or, the raw materials of the color dot base paint also include: cellulose ether II 1.2-1.5%, pH adjuster 0.1-0.2%, defoamer 0.3-0.5%, antifreeze agent 1-2%, film-forming aid II 1-2%, antibacterial agent 0.2-0.3%; And / or, the raw materials of the continuous phase solution also include: pH adjuster 0.2-0.3%, film-forming aid III 2-4%, rheology aid II 0.2-1%, antibacterial agent 0.2-0.3%, defoaming agent 0.2-0.5%.

6. The multifunctional reflective heat-insulating granite paint according to claim 5 is characterized in that: The anti-settling agent is at least one of hydroxyethyl cellulose, organic bentonite and fumed silica, and / or the antibacterial agent is at least one of isothiazolinone, benzimidazole, benzisothiazolinone and dithiocyanomethane.

7. The multifunctional reflective heat-insulating granite paint according to claim 6 is characterized in that: The water-based acrylic emulsion has a solid content of 45-52%, a viscosity of 2500-4000 mPa·s, and a temperature condition of 25°C.

8. The multifunctional reflective heat-insulating granite paint according to claim 7 is characterized in that: The barium sulfate is ultrafine barium sulfate with an average particle size of 1.2-2 μm; the reflective heat-insulating titanium dioxide is titanium dioxide W800.

9. A method for preparing the multifunctional reflective heat-insulating granite coating according to any one of claims 1 to 8, characterized in that: The specific steps include: S1: adding the raw materials of the main color base paint to a high-speed stirring container, stirring at a speed of 1200-2000 rpm until uniform, to obtain the main color base paint, for standby use; S2: adding the required raw materials of the magnesium silicate lithium gel solution, the color point base paint and the continuous phase solution to three high-speed stirring containers respectively, and stirring at a speed of 1200-2000 rpm until uniform magnesium silicate lithium gel solution, the color point base paint and the continuous phase solution are obtained; S3: mixing the color point base paint with the magnesium silicate lithium gel solution to obtain color points, and then mixing with the continuous phase solution according to a proportion to obtain color point paint; S4: First spray the main color base paint and ventilate and dry for 5-7 hours, then spray the color point paint on the surface of the main color base paint. After drying and curing, the paint is obtained.

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