Multifunctional reflective thermal insulation granite paint and preparation method thereof

Abstract

The application 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 thermal insulation granite coating is prepared from 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 lithium magnesium silicate glue solution and 20-30% of continuous phase solution. The granite coating prepared by the application can simultaneously have excellent reflective thermal insulation and decoration functions, can simultaneously have good waterproofness, weather resistance, corrosion resistance and coating mechanical properties, can effectively combine the functions of various paint materials in the past, can form a multifunctional reflective thermal insulation granite coating capable of meeting the high-performance requirements of the existing building industry for external wall coatings, no longer needs the complex construction process of the multi-layer coatings in the past, greatly reduces the labor cost, has better decoration effect and rich colors, and thus has very excellent application prospect.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of reflective thermal insulation coatings, in particular to a multifunctional reflective thermal insulation granite coating and a preparation method thereof. BACKGROUND

[0002] With the development of modern construction industry, higher requirements are put forward for the functionality and environmental protection of building materials. Although traditional granite stone materials are widely used in the decoration of the outer walls of buildings due to their unique texture and aesthetic appearance, they have problems such as heavy weight, complex construction, high cost, and environmental damage during mining. In addition, traditional granite materials do not have reflective thermal insulation function and cannot effectively reduce the temperature difference between the inner and outer walls of buildings, resulting in increased air conditioning energy consumption.

[0003] In recent years, in order to overcome the above problems, various stone-imitating coatings have appeared on the market, such as real stone paint and rock sheet stone-imitating paint. These coatings have the advantages of light weight, rich color, and simple construction, but they still have deficiencies in reflective thermal insulation performance and are difficult to achieve a visual effect similar to natural granite with a similarity of more than 95%. In addition, traditional stone-imitating coatings are prone to color difference and insufficient weather resistance during long-term use, which affects the decorative effect and service life. On the other hand, ordinary waterproof coatings in existing coatings do not have a decorative function, and ordinary water-based multi-color granite coatings do not have a waterproof function. Therefore, the conventional construction process is to first apply waterproof coatings to the outer wall and then apply water-based multi-color granite coatings to the outer wall, which is relatively complex and lacks reflective thermal insulation performance, cannot save energy and reduce consumption, and cannot control the temperature of the inner wall.

[0004] Therefore, in order to effectively solve the above problems, the present application provides a multifunctional reflective thermal insulation granite coating and a preparation method thereof. The granite coating prepared by the present application not only has excellent reflective thermal insulation and decorative functions, but also has good waterproofness, weather resistance, corrosion resistance, and mechanical properties of the coating, effectively combines the functions of various coatings, forms a multifunctional reflective thermal insulation granite coating that meets the high performance requirements of the existing construction industry for outer wall coatings, and no longer needs the complex construction process of multiple layers of coatings, greatly reduces labor costs, and has better decorative effect and rich color, thereby having very excellent application prospect. SUMMARY

[0005] In order to solve the above problems, the present application provides a multifunctional reflective thermal insulation granite coating. The raw materials are as follows in terms of mass percentage: 20-30% of main color base paint, 25-35% of color point base paint, 15-25% of magnesium lithium silicate sol, and 20-30% of continuous phase solution.

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

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

[0008] As a preferred scheme, the lithium magnesium silicate glue solution is prepared from the following raw materials in percentage by mass: 0.1-0.3% of a sedimentation inhibitor, 0.2-0.5% of a bacteriostatic agent, 4-6% of lithium magnesium silicate, and the rest of deionized water.

[0009] As a preferred scheme, the sedimentation inhibitor is at least one of hydroxyethyl cellulose, organic bentonite and fumed silica.

[0010] As a preferred scheme, the sedimentation inhibitor is hydroxyethyl cellulose.

[0011] As a preferred scheme, the bacteriostatic agent is at least one of isothiazolinone, benzimidazole, benzisothiazolinone and dithiocarbamyl methane.

[0012] As a preferred scheme, the bacteriostatic agent is isothiazolinone.

[0013] As a preferred scheme, the main color base paint is prepared from the following raw materials in percentage by mass: 35-40% of a water-based acrylic emulsion, 25-30% of barium sulfate, 8-10% of reflective heat insulation titanium dioxide, 3-6% of reflective heat insulation color paste, 0.3-0.5% of cellulose ether I, 0.2-0.3% of pH adjuster, 0.3-0.5% of dispersant, 0.1-0.2% of wetting agent, 0.3-0.5% of defoaming agent, 0.3-0.5% of rheological aid I, 2-2.5% of film-forming aid I, 0.5-1% of anti-freezing agent, 0.2-0.3% of polysiloxane, 0.3-0.5% of mildewproof agent, 0.1-0.2% of bacteriostatic agent, 4-8% of modified resin, and the rest of deionized water.

[0014] As a preferred scheme, the water-based acrylic emulsion has a solid content of 45-52% and a viscosity of 2500-4000 mPa·s at a temperature of 25℃.

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

[0016] As a preferred scheme, the reflective heat insulation titanium dioxide is titanium dioxide W800.

[0017] As a preferred scheme, the preparation method of the reflective heat insulation color paste specifically comprises the following steps: titanium dioxide W800, polyvinylpyrrolidone, Tween 80, sodium hydroxyethyl cellulose, propylene glycol and sodium polyacrylate are mixed and added into a high-speed stirring tank, and finally deionized water is added, stirred at a speed of 2000-3000 rpm for 40-60 min until uniformly dispersed, then ground in a sand mill, and then removed through a 400-450 mesh screen to remove large particles, and the process is completed.

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

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

[0020] As a preferred scheme, the dispersing agent is at least one of polycarboxylate dispersants.

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

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

[0023] As a preferred scheme, the rheological aid I is polyurethane or polyacrylic acid sodium.

[0024] As a preferred scheme, the rheological aid I is polyacrylic acid sodium.

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

[0026] As a preferred scheme, the anti-freezing agent is a combination of glycol and propylene glycol.

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

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

[0029] As a preferred scheme, the antifungal agent is zinc pyrithione.

[0030] As a preferred scheme, the fungicide in the main color base paint is consistent with the fungicide in the lithium magnesium silicate solution.

[0031] As a preferred solution, the preparation method of the modified resin specifically comprises the following steps: S1: mixing isobornyl methacrylate, 2-ethylhexyl acrylate, hydroxyethyl methacrylate, 2-(perfluorooctyl) ethyl acrylate and vinyl tri(2-methoxyethoxy) silane into deionized water, then adding sodium polycarboxylate, stirring to form a pre-emulsion; S2: taking part of the pre-emulsion and adding it into deionized water, then adding ammonium persulfate, heating and keeping warm until the blue phase is generated; S3: adding ammonium persulfate again, adding the remaining pre-emulsion into the reaction system dropwise, and adding hydroquinone; S4: after the reaction is completed, the system is cooled, large particles are removed by filtering screen, and it is stored in a sealed state after keeping warm.

[0032] As a preferred solution, the preparation method of the modified resin specifically comprises the following steps: S1: mixing isobornyl methacrylate, 2-ethylhexyl acrylate, hydroxyethyl methacrylate, 2-(perfluorooctyl) ethyl acrylate and vinyl tri(2-methoxyethoxy) silane into deionized water, then adding sodium polycarboxylate, stirring at a speed of 1000-1400 rpm to form a pre-emulsion; S2: taking 10wt% of the pre-emulsion and adding it into deionized water, then adding ammonium persulfate, heating to 75-80°C and keeping warm until the blue phase is generated; S3: adding ammonium persulfate again, and adding the remaining pre-emulsion into the reaction system dropwise, controlling the dropwise adding time to be 2-3h, keeping warm for 2-3h after the dropwise adding is completed, and adding hydroquinone; S4: after the reaction is completed, the system is naturally cooled to 30-40°C, then large particles are removed by filtering a 400-500 mesh screen, and it is stored in a sealed state after keeping warm.

[0033] As a preferred solution, 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 solution, 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 scheme, the raw materials of the color point base paint are as follows in percentage by mass: water-based acrylic emulsion 25-30%, reflective heat-insulating titanium white powder 8-10%, modified dispersant 2-4%, cellulose ether II 1.2-1.5%, pH regulator 0.1-0.2%, defoaming agent 0.3-0.5%, anti-freezing agent 1-2%, film-forming aid II 1-2%, anti-bacterial agent 0.2-0.3%, and deionized water to make up the balance.

[0036] As a preferred scheme, 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 scheme, the reflective heat-insulating titanium white powder in the color point base paint is consistent with that in the main color base paint.

[0038] As a preferred scheme, the preparation method of the modified dispersant specifically comprises the following steps: S1: adding polymethylhydrogen siloxane and acrylic acid in deionized water and stirring; S2: after the stirring is completed, adding polyethylene glycol 1000, ammonium persulfate, mercaptoethanol, phenoxyethyl acrylate and 2-ethylhexyl acrylate in sequence, adding hydroquinone after warming and keeping warm; S3: after the reaction is completed, slowly adding ammonia water to adjust the pH value, cooling, sieving the product, and obtaining the product.

[0039] As a preferred scheme, the preparation method of the modified dispersant specifically comprises the following steps: S1: adding deionized water in a high-speed stirrer, adding polymethylhydrogen siloxane and acrylic acid at a rotation speed of 400-600 rpm in a room temperature environment, warming to 60-65°C, and stirring at a rotation speed of 600-800 rpm for 30-40 min; S2: after the stirring is completed, adding polyethylene glycol 1000, ammonium persulfate and mercaptoethanol in sequence, stirring at a rotation 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, warming to 80-85°C after the stirring is completed, keeping warm for 3-4 h, and adding hydroquinone; S3: after the reaction is completed, slowly adding ammonia water to control 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 scheme, the mass ratio of the polymethylhydrogen siloxane, the acrylic acid and the polyethylene glycol 1000 is (5-8):(30-35):(3-4).

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

[0042] In the present application, by adding the above modified dispersant, the presence of multiple hydrophobic long chains can achieve the barrier effect of the paint system on water molecules, and by the more dense molecular chain network and intermolecular adhesion, the penetration path of water molecules is greatly improved, and when external force and water are applied, the more firm intermolecular adhesion can greatly enhance the resistance of the coating system to molecular chain slip, thereby greatly reducing the probability of surface hydration layer formation and reducing the penetration probability during long-term external use of the paint, and through the resistance effect of molecular chain slip, the paint can always maintain good crack resistance during long-term use, or maintain the crack in a silver line state, reduce the continuous phase voids caused by cracks, and thus maintain the long-term weather resistance, water resistance and corrosion resistance of the coating, and have excellent mechanical properties.

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

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

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

[0046] As a preferred solution, the anti-freezing agent in the color point base paint is consistent with that in the main color base paint.

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

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

[0049] As a preferred solution, the continuous phase solution has the following raw materials in mass percentage: 40-50% of water-based acrylic emulsion, 0.2-0.3% of pH regulator, 2-4% of film-forming aid III, 0.2-1% of rheological aid II, 0.2-0.3% of anti-bacterial agent, 0.2-0.5% of defoaming agent, and the balance of deionized water.

[0050] As a preferred solution, the water-based acrylic emulsion in the continuous phase solution is consistent with that in the main color base paint.

[0051] As a preferred solution, the pH regulator 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 anti-bacterial 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 a dodecanol ester or a hexadecanol ester.

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

[0056] As a preferred solution, the rheology aid II is at least one of the group of polyurethane-based rheology aids.

[0057] The second aspect of the present application provides a preparation method of the multifunctional reflective thermal insulation granite paint, which specifically comprises the following steps: S1: mixing raw materials of a main color base paint into a high-speed stirring container, stirring at a speed of 1200-2000 rpm until uniformity, to obtain the main color base paint, for standby; S2: similarly, adding required raw materials of lithium magnesium silicate sol solution, color point base paint and continuous phase solution into three high-speed stirring containers respectively, and stirring at a speed of 1200-2000 rpm until uniformity to obtain the lithium magnesium silicate sol solution, the color point base paint and the continuous phase solution; S3: granulating the color point base paint in the lithium magnesium silicate sol solution to obtain color points, and then mixing the color points with the continuous phase solution in proportion to obtain a color point paint; S4: first spraying the main color base paint and drying for 5-7 h, and then spraying the color point paint on the surface of the main color base paint, and after drying and curing, the paint is obtained.

[0058] The present application has the beneficial effects:

[0059] 1. The multifunctional reflective thermal insulation granite paint provided in the present application can not only have excellent reflective thermal insulation and decoration functions, but also can maintain good waterproofness, weather resistance, corrosion resistance and coating mechanical properties, effectively combines the functions of multiple paints in the past, forms a multifunctional reflective thermal insulation granite paint that can meet the high performance requirements of the existing building industry for exterior wall paint, and no longer needs the complex construction process of multiple layers of paint in the past, greatly reduces the labor cost, and has better decoration effect and rich color, thereby having very excellent application prospect.

[0060] 2、The multifunctional reflective thermal insulation granite paint provided in the application can realize the blocking of water molecules in the paint system by the presence of the modified dispersant, and can greatly improve the penetration path of water molecules by the more dense molecular chain network and intermolecular adhesion. When external force and water are applied, the adhesion between the more firm molecular chains can greatly enhance the resistance of the paint system to molecular chain sliding, thereby greatly reducing the probability of surface hydration layer formation and penetration probability during long-term external use of the paint. The resistance to cracking can be maintained during long-term use, or the cracks can be maintained in a silver line state, reducing the continuous phase voids caused by cracks, thereby maintaining the long-term weather resistance, water resistance, and corrosion resistance of the paint, and the paint has excellent mechanical properties.

[0061] 3、The multifunctional reflective thermal insulation granite paint provided in the application can realize the penetration connection of the internal crosslinking system in the base paint, thereby greatly increasing the tightness between the internal molecules, enhancing the steric hindrance, reducing the probability of side reactions in the system, and on the other hand, reducing the pore size of the vibration pores of the solid particles in the paint system, avoiding the connection of large continuous voids to form regional macropores, thereby ensuring the performance stability of the paint during long-term use, and helping to improve its water resistance, reflective thermal insulation, mechanical properties, and weather resistance. DETAILED DESCRIPTION

[0062] The technical solutions in the above summary of the application will be further described and demonstrated in the form of specific embodiments. The following examples are only actual examples for illustrating and explaining the content of the technical solutions in the specification, and should not limit the scope of the claims to be protected by the application. Any technical product based on the technical solutions described in the summary of the application should be included in the scope to be protected by the application.

[0063] In the following examples, unless otherwise specified, the raw materials are commercially available products or can be prepared by methods well known to those skilled in the art.

[0064] Example 1

[0065] Example 1 provides a multifunctional reflective thermal insulation granite paint. The raw materials are as follows in mass percentage: 25.2% of base paint, 29.8% of color point base paint, 20.5% of lithium magnesium silicate sol, and 24.5% of continuous phase solution.

[0066] The lithium magnesium silicate sol is prepared from the following raw materials in mass percentage: 0.2% of anti-settling agent, 0.28% of anti-bacterial agent, 5.5% of lithium magnesium silicate, and the balance of deionized water.

[0067] The anti-settling agent is hydroxyethyl cellulose; the anti-bacterial agent is isothiazolinone.

[0068] The main color base paint, in terms of mass percentage, has the following raw materials: water-based acrylic emulsion 38%, barium sulfate 26.5%, reflective heat insulation titanium dioxide 8.8%, reflective heat insulation color paste 5.5%, cellulose ether I 0.42%, pH adjuster 0.25%, dispersant 0.44%, wetting agent 0.16%, defoaming agent 0.33%, rheological aid I 0.36%, film-forming aid I 2.2%, anti-freezing agent 0.8%, polysiloxane 0.2%, mildew-proof agent 0.4%, anti-bacterial agent 0.1%, modified resin 7.5%, and deionized water to make up the balance.

[0069] The water-based acrylic emulsion has a solid content of 48% and a viscosity of 2500 mPa·s, and is an Acronal Proof 1108S product purchased from BASF (China) Co., Ltd.

[0070] The barium sulfate is superfine barium sulfate with an average particle size of 1.6 μm.

[0071] The reflective heat insulation titanium dioxide is titanium dioxide W800.

[0072] The preparation method of the reflective heat insulation color paste specifically includes the following steps: 22.5 parts of titanium dioxide W800, 3.2 parts of polyvinylpyrrolidone, 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 tank, and finally 50 parts of deionized water is added, stirred at a speed of 2000 rpm for 50 min until uniformly dispersed, then ground in a sand mill, and after removing large particles through a 450-mesh screen, the product is obtained.

[0073] The polyvinylpyrrolidone is a polyvinylpyrrolidone K30 product sold by Zhongshan Dixin Chemical Co., Ltd.

[0074] The cellulose ether I is methyl hydroxyethyl cellulose; the pH adjuster is ammonia water; the dispersant is a polycarboxylate dispersant, a CX4320AM product sold by BASF Co., Ltd. of Germany; the wetting agent is PEG-20 oleate; and the defoaming agent is silicone defoaming agent BYK-066N.

[0075] The rheological aid I is sodium polyacrylate, a TT-935 product sold by Dow Chemical (Shanghai) Co., Ltd.; and the film-forming aid I is dodecanol ester.

[0076] The anti-freezing agent is a combination of glycol and propylene glycol, with a mass ratio of 3.5:1.1.

[0077] The polysiloxane is polydimethylsiloxane, which is purchased from an industrial grade product sold by Jinan Yingyu Chemical Co., Ltd. in China.

[0078] The mildewcide is zinc pyrithione; the fungicide in the primary color base paint is consistent with the fungicide in the lithium magnesium silicate solution.

[0079] The preparation method of the modified resin specifically comprises the following steps, in terms of mass parts: 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 tri(2-methoxyethoxy) silane are mixed and added into 160 parts of deionized water, and then 2.1 parts of sodium polycarboxylate is added, and the mixture is stirred at a speed of 1200 rpm to form a pre-emulsion; S2: 10 wt% of the pre-emulsion is added into 280 parts of deionized water, and then 0.04 parts of ammonium persulfate is added, and the temperature is raised to 80℃ for reaction until a blue phase is generated; S3: 0.3 parts of ammonium persulfate is added again, and the remaining pre-emulsion is added dropwise into the reaction system, the dropwise adding time is controlled to be 2h, and after the dropwise adding is completed, the reaction is kept for 2.5h, and 0.21 parts of hydroquinone is added; S4: after the reaction is completed, the system is naturally cooled to 35℃, and then large particle materials are removed by filtering through a 450 mesh screen, and the system is kept and stored in a sealed manner.

[0080] The raw materials of the color point base paint, in terms of mass percentage, are as follows: 28.2% of water-based acrylic emulsion, 8.5% of reflective heat insulation titanium white, 3.5% of modified dispersant, 1.3% of cellulose ether II, 0.2% of pH adjuster, 0.4% of defoaming agent, 1.6% of anti-freezing agent, 1.4% of film-forming aid II, 0.3% of fungicide, and deionized water to make up the balance.

[0081] The water-based acrylic emulsion in the color point base paint is consistent with that in the primary color base paint.

[0082] The reflective heat insulation titanium white in the color point base paint is consistent with that in the primary color base paint.

[0083] The preparation method of the modified dispersant specifically comprises the following steps, in terms of mass parts: S1: 200 parts of deionized water are added in a high-speed stirrer, 6.5 parts of polymethyl hydrogen siloxane and 32.5 parts of acrylic acid are added at room temperature under a rotation speed of 400-600 rpm, the temperature is raised to 65℃, and stirring is performed at a rotation speed of 600 rpm for 35 min; 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 sequentially added, stirring is performed at a rotation speed of 400 rpm for 12 min each time, then 9.4 parts of phenoxyethyl acrylate and 3.2 parts of 2-ethylhexyl acrylate are sequentially added, and stirring is continued for 30 min, after the stirring is completed, the temperature is raised to 80℃, and the reaction is maintained for 3 h, and 0.26 parts of hydroquinone is added; S3: after the reaction is completed, ammonia water is slowly added, the pH value of the system is controlled to 7.5, then the system is naturally cooled to room temperature, the product is filtered by using a 500-mesh screen, and the filtering is completed.

[0084] The cellulose ether II is sodium methylhydroxypropyl cellulose.

[0085] The pH regulator in the color point base paint is consistent with that in the main color base paint.

[0086] The defoaming agent in the color point base paint is consistent with that in the main color base paint.

[0087] The antifreeze agent in the color point base paint is consistent with that in the main color base paint.

[0088] The film-forming aid II is cetyl alcohol ester.

[0089] The fungicide in the color point base paint is consistent with that in the main color base paint.

[0090] In the continuous phase solution, the water-based acrylic emulsion is consistent with that in the main color base paint.

[0091] In the continuous phase solution, the pH regulator is consistent with that in the main color base paint.

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

[0093] In the continuous phase solution, the defoaming agent is consistent with that in the main color base paint.

[0094] In the continuous phase solution, the fungicide is consistent with that in the main color base paint.

[0095] The film-forming aid III is dodecanol ester; and the rheological aid II is a polyurethane rheological aid product of PU1191 type sold by BASF (China) Co., Ltd.

[0096] The second aspect of the embodiment provides a preparation method of the multifunctional reflective thermal insulation granite paint, which specifically comprises the following steps: S1: mixing raw materials of the main color base paint into a high-speed stirring container, stirring at a speed of 1600 rpm until uniformity to obtain the main color base paint, which is ready for use; S2: adding required raw materials of the lithium magnesium silicate sol, the color point base paint and the continuous phase solution into three high-speed stirring containers respectively, and stirring at a speed of 1200-2000 rpm until uniformity to obtain the lithium magnesium silicate sol, the color point base paint and the continuous phase solution; S3: granulating the color point base paint in the lithium magnesium silicate sol to obtain the color point, and then mixing the color point with the continuous phase solution in a proper proportion to obtain the color point paint; S4: first spraying the main color base paint and drying for 6 h, then spraying the color point paint on the surface of the main color base paint, and after drying and curing, the paint is obtained.

[0097] Example 2

[0098] The specific implementation of the comparative example is basically the same as that of Example 1, except that the multifunctional reflective thermal insulation granite paint has raw materials in the following proportions by mass percentage: main color base paint 28%, color point base paint 28.5%, lithium magnesium silicate sol 18.5%, and continuous phase solution 25%.

[0099] Example 3

[0100] The specific implementation of the comparative example is basically the same as that of Example 1, except that the multifunctional reflective thermal insulation granite paint has raw materials in the following proportions by mass percentage: main color base paint 23.5%, color point base paint 28.5%, lithium magnesium silicate sol 22%, and continuous phase solution 26%.

[0101] Comparative Example 1

[0102] The specific implementation of the comparative example is basically the same as that of Example 1, except that the main color base paint has raw materials in the following proportions by mass percentage: water-based acrylic emulsion 42.5%, barium sulfate 30.5%, reflective thermal insulation titanium dioxide 10.5%, reflective thermal insulation color paste 5.5%, cellulose ether I 0.42%, pH adjuster 0.25%, dispersant 0.44%, wetting agent 0.16%, defoaming agent 0.33%, rheological additive I 0.36%, film-forming additive I 2.2%, anti-freezing agent 0.8%, polysiloxane 0.2%, mildew-proof agent 0.4%, antibacterial agent 0.1%, modified resin 2%, and deionized water to make up the balance.

[0103] Comparative Example 2

[0104] The specific implementation of the present comparative example is basically the same as that of Example 1, except that the main color base paint has the following raw materials in mass percentage: water-based acrylic emulsion 42.5%, barium sulfate 30.5%, reflective heat insulation titanium dioxide 6%, reflective heat insulation color paste 5.5%, cellulose ether I 0.42%, pH adjuster 0.25%, dispersant 0.44%, wetting agent 0.16%, defoaming agent 0.33%, rheological aid I 0.36%, film-forming aid I 2.2%, anti-freezing agent 0.8%, polysiloxane 0.2%, mildew-proof agent 0.4%, anti-bacterial agent 0.1%, modified resin 10%, and deionized water to make up the balance.

[0105] Comparative Example 3

[0106] The specific implementation of the present comparative example is basically the same as that of Example 1, except that the main color base paint has the following raw materials in mass percentage: water-based acrylic emulsion 42.5%, barium sulfate 30.5%, reflective heat insulation titanium dioxide 6%, reflective heat insulation color paste 5.5%, cellulose ether I 0.42%, pH adjuster 0.25%, dispersant 0.44%, wetting agent 0.16%, defoaming agent 0.33%, rheological aid I 0.36%, film-forming aid I 2.2%, anti-freezing agent 0.8%, polysiloxane 0.2%, mildew-proof agent 0.4%, anti-bacterial agent 0.1%, modified resin 10%, and deionized water to make up the balance.

[0107] Comparative Example 4

[0108] The specific implementation of the present 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 in mass parts: 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 is added, and the mixture is stirred at a speed of 1200 rpm to form a pre-emulsion; S2: 10 wt% of the pre-emulsion is added to 280 parts of deionized water, and then 0.04 parts of ammonium persulfate is added, and the temperature is raised to 80°C for reaction until the blue phase is generated; S3: 0.3 parts of ammonium persulfate is added again, and the remaining pre-emulsion is added dropwise to the reaction system, and the dropwise time is controlled for 2h, and after the dropwise addition is completed, the reaction is kept for 2.5h, and 0.21 parts of hydroquinone is added; S4: after the reaction is completed, the system is naturally cooled to 35°C, and then filtered through a 450-mesh screen to remove large particles, and stored in a sealed state, to obtain the modified resin.

[0109] Comparative Example 5

[0110] The specific implementation of the 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: 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 tri(2-methoxyethoxy) silane are mixed and added into 160 parts of deionized water, and then 2.1 parts of sodium polycarboxylate is added, and the mixture is stirred at a speed of 1200 rpm to form a pre-emulsion; S2: 10 wt% of the pre-emulsion is added into 280 parts of deionized water, and then 0.04 parts of ammonium persulfate is added, and the temperature is raised to 80°C for reaction until a blue phase is formed; S3: 0.3 parts of ammonium persulfate is added again, and the remaining pre-emulsion is added dropwise into the reaction system, and the dropwise time is controlled to be 2h, and after the dropwise addition is completed, the reaction is kept for 2.5h, and 0.21 parts of hydroquinone is added; S4: after the reaction is completed, the system is naturally cooled to 35°C, and then filtered through a 450 mesh screen to remove large particles, and stored in a sealed state, and the modified resin is obtained.

[0111] Comparative Example 6

[0112] The specific implementation of the 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: S1: in a high-speed stirrer, 200 parts of deionized water is added, 10.5 parts of polymethylhydrogen siloxane and 15.5 parts of acrylic acid are added at a speed of 400-600 rpm under room temperature, and the temperature is raised to 65°C, and stirred at a speed of 600 rpm for 35 min; S2: after 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, each time stirring at a speed of 400 rpm for 12 min, and then 9.4 parts of phenoxyethyl acrylate and 3.2 parts of 2-ethylhexyl acrylate are added in sequence and continue to stir for 30 min, and after stirring is completed, the temperature is raised to 80°C, and the reaction is kept for 3h, and 0.26 parts of hydroquinone is added; S3: after the reaction is completed, ammonia water is slowly added, and the pH value of the system is controlled to be 7.5, and then the product is naturally cooled to room temperature, and the product is filtered through a 500 mesh screen, and washed with deionized water for 3 times, and the modified resin is obtained after completion.

[0113] Comparative Example 7

[0114] The specific implementation of the comparative example is basically the same as that of Example 1, except that the preparation method of the modified dispersant specifically comprises the following steps: S1: 200 parts of deionized water are added in a high-speed stirrer, 6.5 parts of polymethyl hydrogen siloxane and 32.5 parts of acrylic acid are added at room temperature under a rotation speed of 400-600 rpm, the temperature is raised to 65°C, and stirring is carried out at a rotation speed of 600 rpm for 35 min; S2: after stirring is completed, 3.2 parts of polyethylene glycol 1000, 0.6 parts of ammonium persulfate and 0.2 parts of mercaptoethanol are sequentially added, each time stirring at a rotation speed of 400 rpm for 12 min, then 3 parts of phenoxyethyl acrylate and 1.5 parts of 2-ethylhexyl acrylate are sequentially added and stirring is continued for 30 min, after stirring is completed, the temperature is raised to 80°C, and the reaction is carried out for 3 h, and 0.26 parts of hydroquinone is added; S3: after the reaction is completed, ammonia water is slowly added, the pH value of the system is controlled to 7.5, then it is naturally cooled to room temperature, the product is filtered and treated with a 500-mesh screen, and deionized water is circulated and washed for 3 times, and then it is obtained.

[0115] Performance evaluation

[0116] Water resistance test: The products prepared in the examples and comparative examples are tested for water resistance according to the standard JC / T864-2023, the test pressure is 0.3 MPa, and the pressure needs to be maintained for 6 h without water leakage, if there is water leakage, it is recorded as unqualified, otherwise it is qualified, 100 samples are tested for each group, and the qualified rate results are recorded in Table 1.

[0117] Solar reflectance test: The products prepared in the examples and comparative examples are tested for solar reflectance according to the standard JG / T235-2014, and the test value is the average value of 10 tests recorded in Table 1.

[0118] Near-infrared reflectance test: The products prepared in the examples and comparative examples are tested for near-infrared reflectance according to the standard JG / T235-2014, and the test value is the average value of 10 tests recorded in Table 1.

[0119] Stain resistance test: The products prepared in the examples and comparative examples are tested for stain resistance according to the standard HG / T4343-2024, and the grade results are recorded in Table 1.

[0120]

[0121] From the data results of the examples and comparative examples of the present application and Table 1, it can be seen that the examples 1-3 of the present application have obvious advantages in water resistance, heat reflection and insulation, and stain resistance, etc. relative to the comparative examples 1-7, which is mainly because the modified dispersant with the best performance and ratio added in the examples of the present application helps to form a more dense molecular chain segment network and intermolecular adhesion, greatly improves the penetration path of water molecules, and when external force and water are applied, the more firm intermolecular adhesion can greatly enhance the resistance of the coating system to molecular chain slip; on the other hand, the modified resin raw material can realize the penetration connection of the internal crosslinking system in the base paint of the main color, thereby greatly increasing the tightness between the internal molecules, enhancing the steric hindrance, reducing the probability of occurrence 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, avoid the connection of large continuous cavities to form the phenomenon of regional macropores, and thus ensure the performance stability of the coating in long-term use, which helps to improve its water resistance, heat reflection and insulation, mechanical properties and weather resistance, etc.

Claims

1. A multifunctional reflective heat-insulating granite coating, characterized in that: The raw materials of multifunctional reflective heat-insulating granite coating, by weight percentage, are: 20-30% main color base paint, 25-35% colored base paint, 15-25% lithium magnesium silicate adhesive solution, and 20-30% continuous phase solution; The raw materials of the magnesium lithium silicate adhesive solution include: 0.1~0.3% antisettling agent, 0.2~0.5% antibacterial agent, 4~6% magnesium lithium silicate, and deionized water to make up the balance; The raw materials for the main color base paint include: 35-40% water-based acrylic emulsion, 4-8% modified resin, and deionized water to make up the balance. The raw materials of the colored dot base paint include: 25-30% water-based acrylic emulsion, 8-10% reflective and heat-insulating titanium dioxide, 2-4% modified dispersant, and deionized water to make up the balance. The raw materials for the continuous phase solution include: 40-50% aqueous acrylic emulsion, with the remainder made up with deionized water; The preparation method of the modified dispersant includes: S1: adding polymethylhydrosiloxane and acrylic acid to deionized water and stirring; S2: after stirring, adding polyethylene glycol 1000, ammonium persulfate, mercaptoethanol, phenoxyethyl acrylate and 2-ethylhexyl acrylate in sequence, heating and maintaining the temperature, and then adding hydroquinone; S3: after the reaction is complete, slowly adding ammonia water to adjust the pH value, cooling, and sieving the product to obtain the desired product; The preparation method of the modified resin includes: S1: Mixing isobornyl methacrylate, 2-ethylhexyl acrylate, hydroxyethyl methacrylate, 2-(perfluorooctyl)ethyl acrylate and vinyltris(2-methoxyethoxy)silane and adding them to deionized water, adding sodium polycarboxylate, and stirring to form a pre-emulsion; S2: Taking a portion of the pre-emulsion and adding it to deionized water, adding ammonium persulfate, heating and maintaining the temperature until a blue phase is formed; 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, cooling the system, filtering out large particles with a sieve, and storing it in a sealed container to obtain the product; The mass ratio of the polymethylhydrosiloxane, acrylic acid and polyethylene glycol 1000 is (5~8):(30~35):(3~4). The mass ratio of acrylic acid, phenoxyethyl acrylate and 2-ethylhexyl acrylate is (30~35):(8~10):(3~4). The mass ratio of the main color base paint, the speckle base paint and the magnesium lithium silicate adhesive solution is (22~28):(27~32):(18~22). The barium sulfate is ultrafine barium sulfate with an average particle size of 1.2~2μm; the reflective and heat-insulating titanium dioxide is titanium dioxide W800. By weight percentage, the raw materials of the main color base paint also include: barium sulfate 25-30%, reflective and heat-insulating titanium dioxide 8-10%, reflective and heat-insulating color paste 3-6%, cellulose ether I 0.3-0.5%, pH adjuster 0.2-0.3%, dispersant 0.3-0.5%, wetting agent 0.1-0.2%, defoamer 0.3-0.5%, rheology modifier I 0.3-0.5%, film-forming aid I 2-2.5%, antifreeze agent 0.5-1%, polysiloxane 0.2-0.3%, mildew inhibitor 0.3-0.5%, and antibacterial agent 0.1-0.2%; And / or, the raw materials of the speckled base paint further include: cellulose ether II 1.2~1.5%, pH adjuster 0.1~0.2%, defoamer 0.3~0.5%, antifreeze 1~2%, film-forming aid II 1~2%, and antibacterial agent 0.2~0.3%; and / or, the raw materials of the continuous phase solution further include: pH adjuster 0.2~0.3%, film-forming aid III 2~4%, rheology modifier II 0.2~1%, antibacterial agent 0.2~0.3%, and defoamer 0.2~0.5%.

2. The multifunctional reflective heat-insulating granite coating according to claim 1, characterized in that: The anti-settling agent is at least one of hydroxyethyl cellulose, organobentonite, and fumed silica, and / or the antibacterial agent is at least one of isothiazolinone, benzimidazole, benzisothiazolinone, and dithiocyanomethane.

3. The multifunctional reflective heat-insulating granite coating according to claim 2, characterized in that: The aqueous acrylic emulsion has a solid content of 45-52%, a viscosity of 2500-4000 mPa·s, and a temperature condition of 25℃.

4. A method for preparing a multifunctional reflective heat-insulating granite coating according to any one of claims 1 to 3, characterized in that: Specifically, the following steps are included: S1: Add the raw materials of the main color base paint to a high-speed stirring container and stir at 1200~2000 rpm until homogeneous to obtain the main color base paint; S2: Similarly, add the required raw materials of magnesium lithium silicate adhesive solution, speckle base paint and continuous phase solution to three high-speed stirring containers respectively, and stir at 1200~2000 rpm until homogeneous to obtain magnesium lithium silicate adhesive solution, speckle base paint and continuous phase solution; S3: Mix the speckle base paint with magnesium lithium silicate adhesive solution and granulate to obtain speckles, then mix with the continuous phase solution in proportion to obtain speckle paint; S4: First, spray the main color base paint and ventilate and dry for 5-7 hours. Then, spray the colored dot paint on the surface of the main color base paint. After drying and curing, the coating is obtained.

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