A kind of reflective heat-insulating real stone paint and its preparation method and application

Abstract

The present invention relates to the field of coating technology, and discloses a reflective heat-insulating real stone paint, a preparation method thereof, and an application thereof. The reflective heat-insulating real stone paint comprises the following raw materials: a base material, reflective heat-insulating coated stone, reflective heat-insulating rock flakes, stone powder, and pigment powder; the raw materials for preparing the reflective heat-insulating coated stone include coating liquid and stone; the coating liquid includes insulation emulsion, acrylic emulsion, and film-forming aid; the raw materials for preparing the reflective heat-insulating rock flakes include insulation emulsion, elastic pure acrylic emulsion, and expanded perlite powder; the raw materials for preparing the base material include insulation emulsion. The reflective heat-insulating real stone paint provided by the present invention has the characteristics of good storage stability, good construction performance, good insulation effect, low construction consumption, and lightweight, and can meet the application requirements of insulation materials in the field of energy-saving buildings. The preparation method of the reflective heat-insulating real stone paint has simple steps and is suitable for industrial use.

Description

Technical Field

[0001] The present invention relates to the technical field of coatings, and in particular to a reflective heat-insulating real stone paint and a preparation method and application thereof. Background Art

[0002] Energy-saving buildings are a new type of building that is energy-efficient, environmentally friendly, and highly comfortable. Improving the thermal insulation of living spaces is a key component of their development and is crucial for improving energy efficiency and enhancing building comfort and functionality. The selection of insulation materials, the layout of the insulation system, and the design of the insulation system are all crucial in achieving this goal.

[0003] Reflective thermal insulation coatings are functional coatings with high solar reflectance and high hemispherical reflectivity, reflecting sunlight and providing insulation. Reflective thermal insulation natural stone paint is a highly decorative functional coating commonly used on exterior walls. Currently, reflective thermal insulation natural stone paints on the market primarily use synthetic resins as film-forming materials, combined with reflective thermal insulation fillers, pigments, additives, natural sand, and other raw materials. High reflectivity and thermal insulation are achieved primarily through the addition of functional fillers such as hollow glass microspheres or hollow ceramic microspheres. However, these reflective thermal insulation natural stone paints suffer from poor storage stability, poor application properties, difficulty achieving low- to medium-lightness standards, high construction costs, and challenges associated with low-carbon sustainable development. Summary of the Invention

[0004] The present invention aims to solve at least one of the above-mentioned technical problems existing in the prior art. To this end, one of the objects of the present invention is to provide a reflective heat-insulating real stone paint; a second object of the present invention is to provide a method for preparing such a reflective heat-insulating real stone paint; and a third object of the present invention is to provide applications of such a reflective heat-insulating real stone paint.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is:

[0006] The first aspect of the present invention provides a reflective heat-insulating real stone paint, comprising the following preparation raw materials: base material, reflective heat-insulating coated stone, reflective heat-insulating rock flakes, stone powder and pigment powder;

[0007] The raw materials for preparing the reflective heat-insulating coated stone include coating liquid and stone; the coating liquid includes heat-insulating emulsion, acrylic emulsion and film-forming auxiliary agent;

[0008] The raw materials for preparing the reflective thermal insulation rock sheet include thermal insulation emulsion, elastic pure acrylic emulsion and expanded pearlite powder;

[0009] The raw materials for preparing the base material include thermal insulation emulsion.

[0010] Preferably, the thermal insulation emulsion is a core-shell emulsion; further preferably, the thermal insulation emulsion includes at least one of a core-shell silicone-acrylic emulsion and a core-shell acrylic emulsion.

[0011] Preferably, the particle size of the core-shell emulsion is 1000-2000 nm, and the inner core particle size is 300-600 nm.

[0012] Preferably, the solid content of the core-shell emulsion is 40-55 wt%.

[0013] Preferably, the core-shell acrylic emulsion is prepared by a method comprising the following steps:

[0014] 1) reacting an emulsifier, an unsaturated acid, an olefin monomer, an initiator, a silicone compound with an active group, and water to prepare a seed emulsion;

[0015] 2) reacting an emulsifier, an unsaturated acid, an olefin monomer, an initiator, a seed emulsion and water to obtain the core-shell acrylic emulsion.

[0016] Preferably, the emulsifier is selected from at least one of sodium dodecylbenzene sulfonate, sodium lauryl sulfate, fatty alcohol polyoxyethylene ether, polyoxyethylene alkyl ester, and sodium cetyl betaine.

[0017] Preferably, the unsaturated acid is selected from at least one of acrylic acid, methacrylic acid, itaconic acid and fumaric acid.

[0018] Preferably, the olefin monomer is selected from at least one of styrene, methyl methacrylate, butyl acrylate, acrylonitrile and isooctyl acrylate.

[0019] Preferably, the initiator is selected from at least one of sodium persulfate, ammonium persulfate and potassium persulfate.

[0020] Preferably, the siloxane compound with an active group is prepared by a method comprising the following steps: methacryloxypropyl alkoxysilane reacts with an alkyl silicate to prepare a siloxane compound with an active group; wherein the methacryloxypropyl alkoxysilane is selected from at least one of γ-methacryloxypropyltrimethoxysilane, γ-methacryloxypropyltriethoxysilane or γ-methacryloxypropylmethyldimethoxysilane; and the alkyl silicate is selected from at least one of methyl orthosilicate and ethyl orthosilicate.

[0021] Specifically, the present invention replaces the traditional functional filler hollow glass microspheres with a thermal insulation emulsion with a core-shell structure. The hollow volume of the thermal insulation emulsion is 10-20 times that of the traditional hollow glass microspheres, which can effectively reduce the thermal conductivity coefficient, provide better thermal insulation effect, and solve the problems of poor storage stability and poor construction performance of existing real stone paint.

[0022] Preferably, the reflective heat-insulating real stone paint includes the following raw materials, calculated by mass: 20-30 parts of base material, 60-80 parts of reflective heat-insulating coated stone, 0.1-2 parts of reflective heat-insulating rock flakes, 3-6 parts of stone powder, and 0.1-2 parts of pigment powder.

[0023] Preferably, the raw materials for preparing the reflective heat-insulating real stone paint also include a wetting agent and a thickener.

[0024] Preferably, the wetting agent comprises a fatty alcohol polyether wetting agent; preferably at least one of Clariant Genapol X 080, Clariant Genapol PF 20, San Nopco SN-WET 966, and San Nopco SN-WET 126.

[0025] Preferably, the thickener includes a hydrophobically modified alkali-swellable thickener; preferably, Yale Shun TT-615, Wanhua A801, Wanhua At least one of the TA66.

[0026] Preferably, the reflective heat-insulating real stone paint is prepared from the following raw materials, by mass: 20-30 parts of base material, 60-80 parts of reflective heat-insulating coated stone, 0.1-2 parts of reflective heat-insulating rock flakes, 3-6 parts of stone powder, 0.1-2 parts of pigment powder, 0.1-1 parts of wetting agent, and 0.1-2 parts of thickener.

[0027] Preferably, the base material comprises the following raw materials, calculated by mass: 40-60 parts of thermal insulation emulsion, 30-50 parts of water, 0.1-1 part of cellulose, 0.1-1 part of pH regulator, 0.1-3 parts of film-forming aid, 0.1-1 part of antifreeze, 0.1-1 part of defoaming agent, and 0.1-1 part of preservative.

[0028] Preferably, the base material is prepared by a method comprising the following steps:

[0029] Mix water and cellulose, stir and disperse at 500-700 rpm for 5-10 minutes, add pH regulator, film-forming aid, antifreeze agent, heat insulation emulsion, defoamer and preservative in sequence, and continue stirring for 5-10 minutes to obtain the base material.

[0030] Preferably, the reflective insulation coated stone comprises the following raw materials in parts by mass: 5-15 parts of coating liquid and 95-105 parts of stone; the coating liquid comprises the following raw materials in parts by mass: 25-35 parts of insulation emulsion, 55-65 parts of acrylic emulsion and 1-2 parts of film-forming aid.

[0031] Preferably, the raw materials for preparing the coating liquid also include inorganic reflective thermal insulation colorant; the type and amount of the inorganic reflective thermal insulation colorant are adjusted according to the required color; further preferably, the inorganic reflective thermal insulation colorant includes Clariant inorganic reflective thermal insulation colorant.

[0032] Preferably, the stone material comprises expanded perlite. Expanded perlite itself has a microporous structure, low density and excellent heat insulation capacity. After being coated with a coating liquid, its reflective heat insulation effect can be further improved.

[0033] Preferably, the acrylic emulsion is selected from at least one of Budford RS-9977A, Budford RS-998A, and Budford RS-992A.

[0034] Preferably, the particle size of the reflective heat-insulating coated stone is selected from at least one of 40-80 mesh, 80-120 mesh, and 120-180 mesh.

[0035] Preferably, the reflective insulation coating stone comprises 15-25 parts by weight of 40-80 mesh reflective insulation coating stone, 35-45 parts of 80-120 mesh reflective insulation coating stone, and 35-45 parts of 120-180 mesh reflective insulation coating stone. The smaller the particle size of the reflective insulation coating stone used, the more conducive it is to reducing construction consumption and achieving lightweighting. However, using only 120-180 mesh reflective insulation coating stone can easily result in unqualified initial crack resistance.

[0036] Specifically, the present invention uses reflective heat-insulating coated stones to replace the 40-80 mesh, 80-120 mesh, and 120-180 mesh natural colored sand in existing real stone paint. This can not only improve the reflective heat-insulating effect of the real stone paint and solve the problem of unqualified medium and low brightness, but also achieve color diversity and customization of the real stone paint and improve the lightweight effect of the real stone paint.

[0037] Preferably, the reflective heat-insulating coated stone is produced by a method comprising the following steps:

[0038] 1) mixing a heat-insulating emulsion, an acrylic emulsion, a film-forming aid, and an inorganic reflective heat-insulating color paste to obtain a coating liquid;

[0039] 2) Add stones to the reactor, set the speed to 50-100 rpm, turn on the heating to 70-90°C, spray the coating liquid, stir for 5-10 minutes, and dry for 5-10 minutes to obtain the reflective heat-insulating coated stone.

[0040] Preferably, the reflective thermal insulation rock sheet comprises the following raw materials, calculated by mass: 35-45 parts of thermal insulation emulsion, 35-45 parts of elastic pure acrylic emulsion, and 15-25 parts of expanded perlite powder.

[0041] Preferably, the raw materials for preparing the reflective thermal insulation rock sheet also include inorganic reflective thermal insulation color paste; the type and amount of the inorganic reflective thermal insulation color paste are adjusted according to the required color; further preferably, the inorganic reflective thermal insulation color paste includes Clariant inorganic reflective thermal insulation color paste.

[0042] Preferably, the reflective thermal insulation rock sheet is made by a method comprising the following steps:

[0043] The heat-insulating emulsion is mixed with the elastic pure acrylic emulsion to obtain a composite emulsion, and expanded pearlite powder and inorganic reflective heat-insulating color paste are added thereto. The reflective heat-insulating rock sheet is obtained by thermoplastic molding.

[0044] Preferably, the thickness of the reflective heat-insulating rock sheet is 0.01-0.1 mm.

[0045] Preferably, the particle size of the reflective insulation rock pieces is 0.3-1.5 mm.

[0046] Specifically, the reflective heat-insulating rock sheet used in the present invention is light and thin, and is used to replace the 10-40 mesh natural colored sand used in existing real stone paint. While ensuring its embellishment effect, it can also improve the phenomenon of rebound and sand falling during the construction of natural colored sand, and assist in improving the reflective heat-insulating effect and lightweight effect of real stone paint.

[0047] Preferably, the stone powder comprises calcite powder.

[0048] Preferably, the particle size of the stone powder is 180-250 mesh; the stone powder is preferably ultrafine calcite powder CC-200 produced by Guangdong Fujian Building Materials (Jiaoling) Refining Co., Ltd.

[0049] Preferably, the particle size of the pigment powder is 200-300 mesh; the pigment powder is ground from natural colored ore, preferably the natural color powder from Nanzhao County Jiacheng Mining Co., Ltd.

[0050] Specifically, the stone powder and pigment powder used in the present invention have excellent dispersibility and weather resistance, can provide excellent hiding and color matching properties, reduce the use of natural colored sand, reduce the construction consumption of real stone paint, and achieve lightweighting.

[0051] Preferably, the cellulose comprises hydrophobically modified hydroxyethyl cellulose ether, preferably at least one of Ashland 250HBR, Ashland 250H4BR, and Ashland HE-10K.

[0052] Preferably, the pH regulator includes at least one of diethanolamine, butyldiethylenediamine, 2-amino-2-methyl-1-propanol, and 2-amino-2-ethyl-1,3-propanediol; preferably, it is Dow's multifunctional additive APM-95.

[0053] Preferably, the antifreeze includes an alcohol antifreeze; further preferably, the antifreeze includes at least one of ethylene glycol, propylene glycol, and polyethylene glycol.

[0054] Preferably, the defoaming agent includes at least one of polysiloxane, polyether-modified dimethylsiloxane, and polymer composite mineral oil; preferably at least one of BASF FoamstarST 2410AG (A10) and BASF Foamaster MO NXZ.

[0055] Preferably, the preservative includes at least one of 5-chloro-2-methylisothiazoline-3-one, 2-methyl-4-isothiazoline-3-one, and 1,2-benzisothiazolin-3-one; preferably at least one of Dow BIOBAN CM 14 and Dow BT NV2.

[0056] Preferably, the film-forming aid includes an alcohol ester film-forming aid; preferably Eastman TEXANOL ester alcohol 12, Tairun -16 hexadecanediol, Dow COASOL 290 or at least one of the following:

[0057] Preferably, the reflective heat-insulating real stone paint has a viscosity of 90-130 dps at 25°C.

[0058] The second aspect of the present invention provides a method for preparing the reflective heat-insulating real stone paint according to the first aspect of the present invention, comprising the following steps:

[0059] The prepared raw materials are mixed to obtain the reflective heat-insulating real stone paint.

[0060] Preferably, the method specifically comprises the following steps:

[0061] Add the base material into the reactor, start stirring at a speed of 500-800rpm, add the wetting agent, stone powder, pigment powder, reflective insulation coated stone and reflective insulation rock flakes in sequence, stir for 5min-10min, add the thickener to obtain the reflective insulation real stone paint.

[0062] Preferably, during the preparation of the reflective heat-insulating real stone paint, the rotation speed can be appropriately increased as the viscosity increases.

[0063] The third aspect of the present invention provides the application of the reflective heat-insulating real stone paint described in the first aspect of the present invention in the field of energy-saving buildings.

[0064] Compared with the prior art, the present invention has the following beneficial effects:

[0065] 1) The reflective heat-insulating real stone paint provided by the present invention uses heat-insulating emulsion to modify stones and rock flakes, thereby increasing the types of heat-insulating raw materials in the preparation of real stone paint; the reflective heat-insulating coated stone replaces the 40-80 mesh, 80-120 mesh, and 120-180 mesh natural colored sand in the existing real stone paint, effectively improving the reflective heat-insulating effect of the real stone paint, solving the problem of unqualified medium and low brightness, increasing the color diversity and customization of the real stone paint, and achieving lightweight; the reflective heat-insulating rock flakes replace the existing real stone paint The 10-40 mesh natural colored sand is used to embellish the natural colored sand. While ensuring the embellishment effect, it also improves the phenomenon of rebound and sand falling during the construction of the natural colored sand, and further realizes the lightweight while improving the reflective heat insulation effect of the real stone paint. The core-shell type heat insulation emulsion in the base material replaces the traditional functional filler hollow glass microbeads, and the hollow volume is 10-20 times that of the hollow glass microbeads, which makes the reflective heat insulation real stone paint have better storage stability, construction performance and heat insulation effect. The synergistic effect of various heat insulation functional raw materials significantly improves the comprehensive performance of the real stone paint.

[0066] 2) The reflective heat-insulating real stone paint provided by the present invention is added with stone powder and pigment powder, both of which have excellent dispersibility and weather resistance, can provide excellent hiding and color matching properties, reduce the use of natural colored sand, reduce the construction consumption of real stone paint, and achieve lightweighting.

[0067] 3) The reflective heat-insulating real stone paint provided by the present invention has good storage stability, good heat-insulating effect, low construction consumption, light weight, and a simple preparation method, and can meet the application requirements of heat-insulating materials in the field of energy-saving buildings. DETAILED DESCRIPTION

[0068] The present invention is further described in detail below using specific examples. Unless otherwise specified, the raw materials, reagents, and apparatus used in the examples and comparative examples are available from conventional commercial sources or by conventional methods. Unless otherwise specified, all experimental or testing methods are conventional in the art.

[0069] 1. Unless otherwise specified, the “parts” in the following examples and comparative examples refer to “parts by mass”.

[0070] 2. The raw materials used in the following examples and comparative examples for preparing the reflective, thermally insulating coated stone are: 10 parts coating liquid and 100 parts stone. The coating liquid consists of 30 parts thermal insulation emulsion, 60 parts acrylic emulsion, 1.5 parts coalescing agent, and an inorganic reflective, thermally insulating colorant. The stone consists of 20 parts 40-80 mesh natural expanded perlite, 40 parts 80-120 mesh natural expanded perlite, and 120-180 mesh natural expanded perlite. The acrylic emulsion is Budford RS-9977A, the coalescing agent is Eastman TEXANOL Ester Alcohol Dodecahydrate, and the inorganic reflective, thermally insulating colorant is Clariant's.

[0071] The preparation method is as follows: thermal insulation emulsion, acrylic emulsion, film-forming aid, and inorganic reflective thermal insulation color paste are mixed to obtain a coating liquid. Stone is added to a reactor, the speed is set to 80 rpm, the temperature is raised to 80°C, the coating liquid is sprayed, and the mixture is stirred for 8 minutes. The coating liquid is then dried for 8 minutes to obtain the reflective thermal insulation coated stone. The reflective thermal insulation coated stone particle sizes include 40-80 mesh, 80-120 mesh, and 120-180 mesh.

[0072] 3. The raw materials for preparing the reflective thermal insulation rock sheets in the following examples and comparative examples are: 20 parts of inorganic expanded perlite powder, 40 parts of thermal insulation emulsion, 40 parts of elastic pure acrylic emulsion and Clariant inorganic reflective thermal insulation color paste.

[0073] The preparation method is as follows: a thermal insulation latex is mixed with an elastic pure acrylic latex to obtain a composite latex, expanded perlite powder and an inorganic reflective thermal insulation color paste are added, and thermoplastic molding is performed to obtain a reflective thermal insulation rock sheet. The reflective thermal insulation rock sheet has a thickness of 0.05 mm and a particle size of 1.0 mm.

[0074] 4. The core-shell thermal insulation acrylic emulsions in the following examples and comparative examples were prepared by the following steps:

[0075] S1. First, 100 g of ethyl silicate is added to 50 g of deionized water and stirred evenly. During the stirring process, 0.01-0.05 g of glacial acetic acid is added, the temperature is raised to 40-50° C., and stirring is continued for 5 min. Then, 10 g of γ-methacryloxypropyltriethoxysilane monomer is dropwise added to the water. After reacting for 30 min, the temperature is lowered, and 0.1% (w / v) of tetrahydroxypropylethylenediamine is added to the mixture as a stabilizer. Finally, the mixture is filtered to obtain a siloxane compound with an active group.

[0076] S2, dispersing the emulsifier sodium dodecylbenzenesulfonate (DS-4) in deionized water, slowly adding the olefin monomer methyl methacrylate (MMA) and the unsaturated acid methacrylic acid (MAA) into the water under stirring, dispersing at a speed of 600 rpm for 10 minutes, preparing a pre-emulsion for dropwise reaction; mixing sodium persulfate and water evenly, and setting aside as a titration initiator; preparing a reaction flask, adding a certain amount of water and heating it to 83-89° C., adding about 2% of the pre-emulsion and a portion of the sodium persulfate aqueous solution, maintaining the temperature at 83-85° C. for 15 minutes, and showing a blue fluorescent state; continuing to dropwise add the remaining pre-emulsion and the remaining sodium persulfate aqueous solution at 83-85° C. at a uniform rate, stirring at a uniform rate for 4 hours until the reaction forms an emulsion; putting the previously treated silane into the reactor at once, washing it with water, controlling the temperature to 83-85° C. and keeping the reaction for 2 hours, finally cooling it, filtering the emulsion, and obtaining an acrylic seed emulsion;

[0077] S3. Add the acrylic seed emulsion to water, raise the temperature to 90-93°C, add sodium persulfate, and dropwise add an emulsion consisting of sodium dodecylbenzenesulfonate (DS-4), styrene (ST), methyl methacrylate (MMA), allyl methacrylate (AMA), methacrylic acid (MAA), and water, along with the sodium persulfate. The addition time is 150 minutes. When 45% of the emulsion has been added, add aqueous ammonia, react for 5 minutes, and continue the dropwise addition. After the dropwise addition reaction, cool the mixture to 80-83°C, perform a post-treatment reaction with tert-butyl hydroperoxide and ascorbic acid, and maintain the temperature for 20 minutes. Cool the mixture to below 50°C, discharging the mixture to obtain a core-shell thermal insulation acrylic emulsion. The emulsion has a particle size of 1700 nm, a core particle size of 550 nm, and a solids content of 40 wt%.

[0078] The core-shell type heat-insulating acrylic emulsion is used for preparing reflective heat-insulating coated stone and reflective heat-insulating rock slices.

[0079] Example 1

[0080] This embodiment provides a reflective heat-insulating real stone paint, and the raw materials for its preparation are shown in Table 1:

[0081] Table 1 Raw materials for preparing reflective heat-insulating real stone paint in Example 1

[0082]

[0083] Reflective heat-insulating real stone paint is prepared by the following steps:

[0084] 1) Water and cellulose were sequentially added to a reaction kettle, stirred at 600 rpm, and dispersed for 8 minutes. Then, a pH adjuster, a film-forming aid, an antifreeze agent, a thermal insulation emulsion, a defoamer, and a preservative were sequentially added, and stirring was continued for 8 minutes to obtain a base material;

[0085] 2) Add the base material into the reactor, start stirring at 700 rpm, and add the wetting agent, stone powder, pigment powder, reflective insulation coated stone and reflective insulation rock flakes in turn. As the viscosity increases, the speed can be appropriately increased. Stir evenly for 8 minutes, add a thickener to adjust the viscosity to 100 dps to obtain reflective insulation real stone paint.

[0086] Example 2

[0087] This embodiment provides a reflective heat-insulating real stone paint, and the raw materials for its preparation are shown in Table 2:

[0088] Table 2 Raw materials for preparing reflective heat-insulating real stone paint in Example 2

[0089]

[0090] Reflective heat-insulating real stone paint is prepared by the following steps:

[0091] 1) Water and cellulose were sequentially added to a reaction kettle, stirred at 600 rpm, and dispersed for 8 minutes. Then, a pH adjuster, a film-forming aid, an antifreeze agent, a thermal insulation emulsion, a defoamer, and a preservative were sequentially added, and stirring was continued for 8 minutes to obtain a base material;

[0092] 2) Add the base material into the reactor, start stirring at 700 rpm, and add the wetting agent, stone powder, pigment powder, reflective insulation coated stone and reflective insulation rock flakes in turn. As the viscosity increases, the speed can be appropriately increased. Stir evenly for 8 minutes, add a thickener to adjust the viscosity to 100 dps to obtain reflective insulation real stone paint.

[0093] Example 3

[0094] This embodiment provides a reflective heat-insulating real stone paint, and the raw materials for its preparation are shown in Table 3:

[0095] Table 3 Raw materials for preparing reflective heat-insulating real stone paint in Example 3

[0096]

[0097] Reflective heat-insulating real stone paint is prepared by the following steps:

[0098] 1) Water and cellulose were sequentially added to a reaction kettle, stirred at 600 rpm, and dispersed for 8 minutes. Then, a pH adjuster, a film-forming aid, an antifreeze agent, a thermal insulation emulsion, a defoamer, and a preservative were sequentially added, and stirring was continued for 8 minutes to obtain a base material;

[0099] 2) Add the base material into the reactor, start stirring at 700 rpm, and add the wetting agent, stone powder, pigment powder, reflective insulation coated stone and reflective insulation rock flakes in turn. As the viscosity increases, the speed can be appropriately increased. Stir evenly for 8 minutes, add a thickener to adjust the viscosity to 100 dps to obtain reflective insulation real stone paint.

[0100] Example 4

[0101] This embodiment provides a reflective heat-insulating real stone paint, and the raw materials for its preparation are shown in Table 4:

[0102] Table 4 Raw materials for preparing reflective heat-insulating real stone paint in Example 4

[0103]

[0104]

[0105] Reflective heat-insulating real stone paint is prepared by the following steps:

[0106] 1) Water and cellulose were sequentially added to a reaction kettle, stirred at 600 rpm, and dispersed for 8 minutes. Then, a pH adjuster, a film-forming aid, an antifreeze agent, a thermal insulation emulsion, a defoamer, and a preservative were sequentially added, and stirring was continued for 8 minutes to obtain a base material;

[0107] 2) Add the base material into the reactor, start stirring at 700 rpm, and add the wetting agent, stone powder, pigment powder, reflective insulation coated stone and reflective insulation rock flakes in turn. As the viscosity increases, the speed can be appropriately increased. Stir evenly for 8 minutes, add a thickener to adjust the viscosity to 100 dps to obtain reflective insulation real stone paint.

[0108] Comparative Example 1

[0109] This comparative example provides a reflective heat-insulating real stone paint, and the raw materials for its preparation are shown in Table 5:

[0110] Table 5 Raw materials for preparing reflective heat-insulating real stone paint in comparative example 1

[0111]

[0112]

[0113] Reflective heat-insulating real stone paint is prepared by the following steps:

[0114] 1) Water and cellulose were sequentially added to a reaction kettle, stirred at 600 rpm, and dispersed for 8 minutes. Then, a pH adjuster, a film-forming aid, an antifreeze agent, a common silicone-acrylic emulsion, a defoamer, and a preservative were sequentially added, and stirring was continued for 8 minutes to obtain a base material;

[0115] 2) Add the base material into the reactor, start stirring at 700 rpm, and add the wetting agent, stone powder, pigment powder, reflective insulation coated stone and reflective insulation rock flakes in turn. As the viscosity increases, the speed can be appropriately increased. Stir evenly for 8 minutes, add a thickener to adjust the viscosity to 100 dps to obtain reflective insulation real stone paint.

[0116] Comparative Example 2

[0117] This comparative example provides a reflective heat-insulating real stone paint, and the raw materials for its preparation are shown in Table 6:

[0118] Table 6 Raw materials for preparing reflective heat-insulating real stone paint in comparative example 2

[0119]

[0120]

[0121] Reflective heat-insulating real stone paint is prepared by the following steps:

[0122] 1) Water and cellulose were sequentially added to a reaction kettle, stirred at 600 rpm, and dispersed for 8 minutes. Then, a pH adjuster, hollow glass microspheres, a film-forming aid, an antifreeze agent, a common silicone-acrylic emulsion, a defoamer, and a preservative were sequentially added, and stirring was continued for 8 minutes to obtain a base material;

[0123] 2) Add the base material into the reactor, start stirring at 700 rpm, and add the wetting agent, stone powder, pigment powder, reflective insulation coated stone and reflective insulation rock flakes in turn. As the viscosity increases, the speed can be appropriately increased. Stir evenly for 8 minutes, add a thickener to adjust the viscosity to 100 dps to obtain reflective insulation real stone paint.

[0124] Comparative Example 3

[0125] This comparative example provides a reflective heat-insulating real stone paint, and the raw materials for its preparation are shown in Table 7:

[0126] Table 7 Preparation materials of reflective heat-insulating real stone paint in comparative example 3

[0127]

[0128]

[0129] Reflective heat-insulating real stone paint is prepared by the following steps:

[0130] 1) Water and cellulose were sequentially added to a reaction kettle, stirred at 600 rpm, and dispersed for 8 minutes. Then, a pH adjuster, a film-forming aid, an antifreeze agent, a thermal insulation emulsion, a defoamer, and a preservative were sequentially added, and stirring was continued for 8 minutes to obtain a base material;

[0131] 2) Add the base material into the reactor, start stirring at 700 rpm, add reflective insulation coated stone and reflective insulation rock flakes in turn, as the viscosity increases, increase the speed appropriately, stir evenly for 8 minutes, add thickener to adjust the viscosity to 100 dps, and obtain reflective insulation real stone paint.

[0132] Comparative Example 4

[0133] This comparative example provides a reflective heat-insulating real stone paint, and the raw materials for its preparation are shown in Table 8:

[0134] Table 8 Raw materials for preparing reflective heat-insulating real stone paint in comparative example 4

[0135]

[0136]

[0137] Reflective heat-insulating real stone paint is prepared by the following steps:

[0138] 1) Water and cellulose were sequentially added to a reaction kettle, stirred at 600 rpm, and dispersed for 8 minutes. Then, a pH adjuster, a film-forming aid, an antifreeze agent, a thermal insulation emulsion, a defoamer, and a preservative were sequentially added, and stirring was continued for 8 minutes to obtain a base material;

[0139] 2) Add the base material into the reactor, start stirring at 700 rpm, and add wetting agent, stone powder, pigment powder, reflective insulation coated stone and natural colored sand in turn. As the viscosity increases, the speed can be appropriately increased, and stir evenly for 8 minutes. Add thickener to adjust the viscosity to 100 dps to obtain reflective insulation real stone paint.

[0140] Comparative Example 5

[0141] This comparative example provides a reflective heat-insulating real stone paint, and the raw materials for its preparation are shown in Table 9:

[0142] Table 9 Raw materials for preparing reflective heat-insulating real stone paint in comparative example 5

[0143]

[0144] Reflective heat-insulating real stone paint is prepared by the following steps:

[0145] 1) Water and cellulose were sequentially added to a reaction kettle, stirred at 600 rpm, and dispersed for 8 minutes. Then, a pH adjuster, a film-forming aid, an antifreeze agent, a thermal insulation emulsion, a defoamer, and a preservative were sequentially added, and stirring was continued for 8 minutes to obtain a base material;

[0146] 2) Add the base material into the reactor, start stirring at 700 rpm, add wetting agent, stone powder, pigment powder, natural colored sand and reflective insulation rock flakes in turn. As the viscosity increases, the speed can be appropriately increased, stir evenly for 8 minutes, add thickener to adjust the viscosity to 100 dps, and obtain reflective insulation real stone paint.

[0147] Comparative Example 6

[0148] This comparative example provides a reflective heat-insulating real stone paint, and the raw materials for its preparation are shown in Table 10:

[0149] Table 10 Raw materials for preparing reflective heat-insulating real stone paint in comparative example 6

[0150]

[0151] Reflective heat-insulating real stone paint is prepared by the following steps:

[0152] 1) Water and cellulose were sequentially added to a reaction kettle, stirred at 600 rpm, and dispersed for 8 minutes. Then, a pH adjuster, a film-forming aid, an antifreeze agent, a thermal insulation emulsion, a defoamer, and a preservative were sequentially added, and stirring was continued for 8 minutes to obtain a base material;

[0153] Add the base material into the reactor, start stirring at 700 rpm, add natural colored sand, and as the viscosity increases, increase the speed appropriately. Stir evenly for 8 minutes, add a thickener to adjust the viscosity to 100 dps to obtain reflective heat-insulating real stone paint.

[0154] Comparative Example 7

[0155] This comparative example provides a reflective heat-insulating real stone paint, and the raw materials for its preparation are shown in Table 11:

[0156] Table 11 Raw materials for preparing reflective heat-insulating real stone paint in comparative example 7

[0157]

[0158] Reflective heat-insulating real stone paint is prepared by the following steps:

[0159] 1) Water and cellulose were sequentially added to a reaction kettle, stirred at 600 rpm, and dispersed for 8 minutes. Then, a pH adjuster, a film-forming aid, an antifreeze agent, a common silicone-acrylic emulsion, a defoamer, and a preservative were sequentially added, and stirring was continued for 8 minutes to obtain a base material;

[0160] 2) Add the base material into the reactor, start stirring at 700 rpm, add natural colored sand, and as the viscosity increases, increase the speed appropriately, stir evenly for 8 minutes, add a thickener to adjust the viscosity to 100 dps, and obtain reflective heat-insulating real stone paint.

[0161] Performance Testing

[0162] The basic properties and reflective heat insulation effects of the reflective heat insulation real stone paint in test examples 1-4 and comparative examples 1-7 are tested, wherein the reflective heat insulation effect test indicators include solar reflectance, near-infrared reflectance, hemispherical emissivity and thermal conductivity, and the test methods and standards refer to GB / T 25261-2018 "Reflective Heat Insulation Coatings for Buildings"; the basic performance test indicators include surface drying time, initial drying crack resistance, low temperature stability, thermal storage stability, construction properties, water absorption, water resistance, alkali resistance, coating temperature change resistance, stain resistance and bonding strength, and the test methods and standard limits refer to JG / T 24-2018 "Synthetic Resin Emulsion Sand Wall Architectural Coatings".

[0163] In addition, in order to further evaluate the lightweight effect of reflective heat-insulating real stone paint, its consumption was evaluated using the real stone paint hiding power index.

[0164] The hiding power test method is: take a small white card with a black cross dividing seam, use a stainless steel frame of different thicknesses to apply real stone paint on the small white card with a scraper, and then visually inspect it after it dries. It is qualified if no black cross dividing seam can be seen. The real stone paint consumption is evaluated based on the hiding power, that is, real stone paint consumption = real stone paint density * stainless steel frame volume / stainless steel frame area.

[0165] The test method for sand drop rate is: the real stone paint is tested according to the consumption of 1m 2 The sample was sprayed, the mass of the real stone paint used for spraying was recorded, and the mass of the fallen sand was collected at the bottom of the sample with plastic film. The sand falling rate = the mass of the fallen sand / the mass of the real stone paint used.

[0166] The reference standards and limits for the reflective thermal insulation real stone paint test items are shown in Table 12 below. The test results of the basic performance, reflective thermal insulation effect and lightweight effect of the reflective thermal insulation real stone paint in Examples 1-4 are shown in Table 13. The test results of the basic performance, reflective thermal insulation effect and lightweight effect of the reflective thermal insulation real stone paint in Comparative Examples 1-7 are shown in Table 14.

[0167] Table 12 Reference standards and limits for reflective thermal insulation real stone paint test items

[0168] Test items Test Method Evaluation Criteria Sunlight reflectance (low brightness) GB / T 25261-2018 ≥0.25 Near infrared reflectance (low brightness) GB / T 25261-2018 ≥0.40 Hemispherical emissivity (low brightness) GB / T 25261-2018 ≥0.85 Thermal conductivity / [W / (mK)] GB / T 25261-2018 ≤0.08 Surface drying time / h JG / T 24-2018 ≤4h Initial drying crack resistance JG / T 24-2018 No cracking after 3 hours Low temperature stability (3 cycles) JG / T 24-2018 No deterioration Thermal storage stability (15d) JG / T 24-2018 No caking, mildew, coagulation or changes in composition <![CDATA[Consumption of real stone paint / (kg / m 2 )]]> Refer to the above method Actual measurement Construction JG / T 24-2018 Barrier-free application Water absorption / (2h / g) JG / T 24-2018 ≤2.0 Water resistance (96h) JG / T 24-2018 No abnormalities Alkali resistance (96h) JG / T 24-2018 No abnormalities Coating temperature change resistance (5 cycles) JG / T 24-2018 No abnormalities Stain resistance / grade JG / T 24-2018 ≤2 Bond strength (standard state) / MPa JG / T 24-2018 ≥0.60 Bond strength (freeze-thaw cycles) / MPa JG / T 24-2018 ≥0.40

[0169] Table 13 Test results of basic properties, reflective heat insulation effect and lightweight effect of reflective heat insulation real stone paint in Examples 1-4

[0170] Test items Example 1 Example 2 Example 3 Example 4 Sunlight reflectance (low brightness) 0.40 0.41 0.36 0.48 Near infrared reflectance (low brightness) 0.55 0.56 0.51 0.60 Hemispherical emissivity (low brightness) 0.92 0.92 0.91 0.94 Thermal conductivity / [W / (m·K)] 0.035 0.042 0.050 0.028 Surface drying time / h 4h dry 4h dry 4h dry 4h dry Initial drying crack resistance No cracking after 3 hours No cracking after 3 hours No cracking after 3 hours No cracking after 3 hours Low temperature stability (3 cycles) No deterioration No deterioration No deterioration No deterioration Thermal storage stability (15d) No abnormalities No abnormalities No abnormalities No abnormalities <![CDATA[Consumption of real stone paint / (kg / m 2 )]]> 1.5 1.2 1.5 1.1 Sand loss rate / % 0.5 0.4 0.5 0.3 Construction No abnormalities No abnormalities No abnormalities No abnormalities Water absorption / (2h / g) 0.78 0.82 0.55 0.92 Water resistance (96h) No abnormalities No abnormalities No abnormalities No abnormalities Alkali resistance (96h) No abnormalities No abnormalities No abnormalities No abnormalities Coating temperature change resistance (5 cycles) No abnormalities No abnormalities No abnormalities No abnormalities Stain resistance / grade Level 1 Level 1 Level 1 Level 1 Bond strength (standard state) / MPa 0.92 1.12 0.85 1.23 Bond strength (freeze-thaw cycles) / MPa 0.88 0.95 0.63 1.02

[0171] Table 14 Test results of basic properties, reflective heat insulation effect and lightweight effect of reflective heat insulation real stone paint in comparative examples 1-7

[0172]

[0173]

[0174] Table 13 shows the test results of basic performance, reflective heat insulation effect and lightweight effect of reflective heat insulation real stone paint in Examples 1-4, and Table 14 shows the test results of basic performance, reflective heat insulation effect and lightweight effect of reflective heat insulation real stone paint in Comparative Examples 1-7. Combining the test results in Table 13 and Table 14, it can be seen that:

[0175] Compared with Comparative Example 1 (using ordinary silicone acrylic emulsion) or Comparative Example 2 (using ordinary silicone acrylic emulsion and hollow glass microspheres), the reflective thermal insulation real stone paint in Example 1 (using thermal insulation emulsion) has increased solar reflectance, near-infrared reflectance, and hemispherical emissivity, and significantly reduced thermal conductivity, indicating that the core-shell thermal insulation emulsion can completely replace the hollow glass microspheres and provide better reflective thermal insulation effect. In addition, the storage stability of the reflective thermal insulation real stone paint with the addition of the core-shell thermal insulation emulsion is improved.

[0176] Compared with Comparative Examples 4, 5, 6 and 7, the solar reflectance, near-infrared reflectance and hemispherical emissivity of the real stone paint in Example 1 are increased, and the thermal conductivity is significantly reduced, indicating that it has good reflective heat insulation effect; while in Comparative Examples 4, 5 and 6, since only one or two of the core-shell thermal insulation emulsion, reflective heat insulation coated stone and reflective heat insulation rock sheet are used as functional raw materials, the thermal insulation effect of the real stone paint is only slightly improved compared with Comparative Example 7, indicating that in the reflective heat insulation real stone paint provided by the present invention, there is a synergistic effect between the functional raw materials core-shell thermal insulation emulsion, reflective heat insulation coated stone and reflective heat insulation rock sheet, and the three need to be used at the same time to significantly improve the reflective heat insulation effect of the real stone paint.

[0177] Compared with Example 2, Comparative Example 3 and Comparative Example 4, the stone powder, pigment powder and reflective insulation rock flakes used in Example 1 can enhance the covering power of real stone paint, reduce the consumption of real stone paint, reduce the sand loss rate of real stone paint during construction, and achieve lightweight; and while achieving lightweight, the reflective insulation effect is not reduced.

[0178] The reflective thermal insulation real stone paint provided by the present invention replaces the hollow glass microspheres in the traditional functional filler with a core-shell thermal insulation emulsion, thereby improving the reflective thermal insulation effect and storage stability of the real stone paint, and overcoming the defects of poor construction performance and difficulty in meeting the standards for medium and low brightness; the combined use of several functional raw materials such as the core-shell thermal insulation emulsion, reflective thermal insulation coated stone and reflective thermal insulation rock flakes significantly improves the thermal insulation effect of the real stone paint; compared with the existing reflective thermal insulation real stone paint, the construction consumption is reduced by more than 50%, and while improving the reflective thermal insulation effect, it also achieves lightweight, which can meet the application requirements of thermal insulation materials in the field of energy-saving buildings.

Claims

1. A reflective heat-insulating real stone paint, characterized in that: The preparation comprises the following raw materials by weight: 20-30 parts of base material, 60-80 parts of reflective heat-insulating coated stone, 0.1-2 parts of reflective heat-insulating rock flakes, 3-6 parts of stone powder and 0.1-2 parts of pigment powder; The raw materials for preparing the reflective heat-insulating coated stone include coating liquid and stone; the coating liquid includes heat-insulating emulsion, acrylic emulsion and film-forming auxiliary agent; The raw materials for preparing the reflective thermal insulation rock sheet include thermal insulation emulsion, elastic pure acrylic emulsion and expanded pearlite powder; The raw materials for preparing the base material include thermal insulation emulsion; The thermal insulation emulsion is a core-shell acrylic emulsion; the particle size of the core-shell acrylic emulsion is 1000-2000nm, and the core particle size is 300-600nm; The core-shell acrylic emulsion is prepared by a method comprising the following steps: 1) reacting an emulsifier, an unsaturated acid, an olefin monomer, an initiator, a silicone compound with an active group, and water to prepare a seed emulsion; 2) reacting an emulsifier, an unsaturated acid, an olefin monomer, an initiator, a seed emulsion, and water to obtain the core-shell acrylic emulsion; The siloxane compound with active groups is prepared by a method comprising the following steps: reacting methacryloyloxypropyl alkoxysilane with alkyl silicate to obtain the siloxane compound with active groups.

2. The reflective heat-insulating real stone paint according to claim 1, characterized in that: The core-shell acrylic emulsion has a solid content of 40-55 wt %.

3. The reflective heat-insulating real stone paint according to claim 1, characterized in that: The base material includes the following raw materials by mass: 40-60 parts of thermal insulation emulsion, 30-50 parts of water, 0.1-1 part of cellulose, 0.1-1 part of pH regulator, 0.1-3 parts of film-forming aid, 0.1-1 part of antifreeze, 0.1-1 part of defoaming agent, and 0.1-1 part of preservative.

4. The reflective heat-insulating real stone paint according to claim 1, characterized in that: In parts by mass, the reflective insulation coated stone includes the following raw materials: 5-15 parts of coating liquid and 95-105 parts of stone; the coating liquid includes the following raw materials in parts by mass: 25-35 parts of insulation emulsion, 55-65 parts of acrylic emulsion, and 1-2 parts of film-forming aid; wherein, the stone includes expanded perlite.

5. The reflective heat-insulating real stone paint according to claim 1, characterized in that: The thickness of the reflective heat-insulating rock piece is 0.01-0.1 mm; the particle size of the reflective heat-insulating rock piece is 0.3-1.5 mm.

6. The reflective heat-insulating real stone paint according to claim 5, characterized in that: The reflective thermal insulation rock sheet comprises the following raw materials in parts by mass: 35-45 parts of thermal insulation emulsion, 35-45 parts of elastic pure acrylic emulsion, and 15-25 parts of expanded perlite powder.

7. The reflective heat-insulating real stone paint according to claim 1, characterized in that: The stone powder includes calcite powder; And / or, the particle size of the stone powder is 180-250 mesh; And / or, the particle size of the pigment powder is 200-300 mesh.

8. The reflective heat-insulating real stone paint according to claim 3, characterized in that: The cellulose includes hydrophobically modified hydroxyethyl cellulose ether.

9. The method for preparing the reflective heat-insulating real stone paint according to any one of claims 1 to 8, characterized in that: The following steps are involved: The prepared raw materials are mixed to obtain the reflective heat-insulating real stone paint.

10. Use of the reflective heat-insulating real stone paint according to any one of claims 1 to 8 in the field of energy-saving buildings.

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