Water-based radiation cooling paint, coating and preparation method of water-based radiation cooling paint

Abstract

The invention provides a water-based radiation cooling coating, a coating and a preparation method thereof, the raw materials of the coating comprise an inorganic filler, and the inorganic filler comprises a mesoporous material, a metal oxide and carbonate. The coating provided by the invention can effectively reflect sunlight and can effectively radiate heat in a passive manner, so that the cooling and energy-saving effects are realized.

Description

Technical Field

[0001] The present invention relates to the field of radiation cooling materials, and in particular to a water-based radiation cooling paint, a coating and a preparation method thereof. Background Art

[0002] Currently, due to the generally low refractive index of the functional materials used in radiative cooling coatings, it is still difficult to achieve a single-layer radiative cooling coating with high contrast ratio, high reflectivity, and high emissivity in research on the comprehensive performance of such coatings. At the same time, the coatings cannot meet the requirements of practical applications due to their insufficient comprehensive performance. A double-layer coating system can achieve high solar reflectivity and atmospheric window emissivity, while also improving the coating contrast ratio and other comprehensive properties. However, in practical applications, the double-coating system is prone to inconvenience in production and construction, which is not conducive to the application and promotion of water-based radiative cooling coatings. Therefore, finding more effective materials to enable the coating to maintain a strong radiative cooling effect while improving the overall performance of the coating, and ultimately developing a single-layer high-contrast ratio water-based radiative cooling coating is an important development direction for this type of coating.

[0003] Therefore, how to obtain coatings with stronger comprehensive performance and better radiation cooling performance needs to be studied urgently. Summary of the Invention

[0004] The object of the present invention is to provide a water-based radiation cooling paint, a coating and a preparation method thereof, so as to improve the reflection effect of sunlight and thus achieve the purpose of cooling.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A water-based radiant cooling paint, wherein the raw materials of the paint include inorganic fillers;

[0007] Wherein, the inorganic filler includes mesoporous materials, metal oxides and carbonates.

[0008] In some embodiments of the present invention, the mesoporous material is mesoporous zirconium hydrogen phosphate, preferably flaky mesoporous zirconium hydrogen phosphate, more preferably flaky mesoporous zirconium hydrogen phosphate with a particle size of 0.5 to 0.8 μm.

[0009] In some embodiments of the present invention, the metal oxide is at least one of aluminum oxide, zirconium oxide, and magnesium oxide, and / or the carbonate is at least one of calcium carbonate, strontium carbonate, magnesium carbonate, and aluminum carbonate;

[0010] Preferably, the alumina is spherical alumina;

[0011] Preferably, the particle size of the aluminum oxide is 0.8 to 1.0 μm;

[0012] Preferably, the calcium carbonate is spherical calcium carbonate;

[0013] Preferably, the particle size of the calcium carbonate is 0.5 to 0.8 μm.

[0014] In some embodiments of the present invention, at least one of the following features is present:

[0015] The raw materials of the coating further include a thickener, preferably the content of the thickener is 0.01 to 0.10 wt.% of the total mass of the coating, preferably the thickener is at least one of cellulose ether, cellulose ether derivatives, polyurethane, and inorganic thickeners;

[0016] The raw materials of the coating further include a neutralizer, preferably the content of the neutralizer is 0.20-1.00 wt.% of the total mass of the coating, preferably the neutralizer is at least one of an organic amine neutralizer and an inorganic base neutralizer;

[0017] The raw materials of the coating further include a dispersant, preferably the content of the dispersant is 1.00 to 3.00 wt.% of the total mass of the coating, preferably the dispersant is at least one of a polycarboxylate dispersant and a polyether dispersant;

[0018] The raw materials of the coating further include a defoamer, preferably the content of the defoamer is 0.20-1.00 wt.% of the total mass of the coating, preferably the defoamer is at least one of a silicone defoamer and a mineral oil defoamer;

[0019] The raw materials of the coating further include a water-based resin, preferably the content of the water-based resin is 25.0-30.0 wt.% of the total mass of the coating, preferably the water-based resin is at least one of an acrylate copolymer emulsion, a silicone emulsion, and a fluorocarbon emulsion, more preferably the viscosity of the acrylate copolymer emulsion is 300-1000 mPa·s;

[0020] The raw materials of the coating further include a film-forming aid, preferably the content of the film-forming aid is 1.00 to 5.00 wt.% of the total mass of the coating, preferably the film-forming aid is at least one of 2,2,4-trimethyl 1,3-pentanediol monoisobutyrate, diisobutyl succinate, and dipropylene glycol butyl ether;

[0021] The raw materials of the coating further include a fungicide, preferably the content of the fungicide is 1.00 to 3.00 wt.% of the total mass of the coating, preferably the fungicide is at least one of an organic sulfur fungicide, an organic bromine fungicide, a quaternary ammonium salt fungicide, and an isothiazolinone fungicide;

[0022] The raw materials of the coating further include water, and preferably the content of water is 25.0-45.0 wt.% of the total mass of the coating.

[0023] In order to achieve the above object, the present invention also provides the following technical solutions:

[0024] A method for preparing the above-mentioned water-based radiant cooling coating comprises the following steps:

[0025] S1, put water, thickener, neutralizer, dispersant and defoamer into the dispersion tank;

[0026] S2, adding an inorganic filler into the dispersion tank;

[0027] S3, mixing the water-based resin, film-forming aid, and fungicide with the material obtained in step S2, and dispersing them in the dispersion tank to obtain the water-based radiant cooling paint.

[0028] In some embodiments of the present invention, the step S1 has at least one of the following characteristics:

[0029] The mass ratio of water, thickener, neutralizer, dispersant and defoamer is (500-650):(0.5-2.0):(5-10):(10-20):(10-20);

[0030] adding the water, thickener, neutralizer, dispersant, and defoamer at a rotation speed of 500 to 800 rpm;

[0031] The dispersion time of the water, thickener, neutralizer, dispersant and defoamer in the dispersion tank is 0.2 to 0.5 hours;

[0032] The temperature in the dispersion tank is (5-10° C.) to (40-55° C.).

[0033] In some embodiments of the present invention, step S2 has at least one of the following characteristics:

[0034] The mass ratio of the inorganic filler to the material obtained in step S1 is (4.0-4.5):(2.0-3.5);

[0035] The speed of the dispersion cylinder is 1500-2500 rpm, and the dispersion time is 0.5-1.0 h;

[0036] The temperature in the dispersion tank is 5-55°C.

[0037] In some embodiments of the present invention, step S3 has at least one of the following characteristics:

[0038] The mass ratio of the water-based resin, film-forming aid, fungicide and the material obtained in step S2 is (20-25): (1.2-1.8): (0.5-1.0);

[0039] The speed of the dispersion cylinder is 500-800 rpm, and the dispersion time is 0.2-0.5 h;

[0040] The temperature in the dispersion tank is 5-40°C.

[0041] In order to achieve the above object, the present invention also provides the following technical solutions:

[0042] A coating, the coating being made from the above-mentioned water-based radiant cooling coating, or the water-based radiant cooling coating obtained by the above-mentioned method;

[0043] The reflectivity of the coating is greater than or equal to 94%, preferably greater than or equal to 94.15%.

[0044] In order to achieve the above object, the present invention also provides the following technical solutions:

[0045] A method for preparing the above-mentioned coating comprises applying the above-mentioned water-based radiation cooling coating or the water-based radiation cooling coating obtained by the above-mentioned method to the surface of a substrate, and drying the coating to obtain the coating.

[0046] Further areas of applicability will become apparent from the description provided in this disclosure.

[0047] The description and specific examples in this summary are intended for purposes of illustration only and are not intended to limit the scope of the present disclosure.

[0048] Compared with the prior art, the technical solution provided by the present invention has the following beneficial effects:

[0049] 1. The coating provided by the present invention has a high reflectivity for sunlight, thereby achieving a significant cooling effect;

[0050] 2. The present invention uses flaky mesoporous zirconium hydrogen phosphate and metal oxides in synergistic form as a radiant cooling coating, which does not require multiple coating layers or ultra-high pigment volume concentration (PVC) of the coating, and can achieve a high solar reflectivity and atmospheric window emissivity, thereby obtaining an excellent cooling effect.

[0051] 3. The single-coat radiant cooling paint prepared by the present invention has excellent comprehensive performance, which is better than the requirements of the superior product of GB / T9755-2024 "Synthetic Resin Emulsion Wall Paint", and breaks through the current standard performance of single-layer radiant cooling paint. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some implementation plans of the present invention. For those skilled in the art, other solutions can be obtained based on these drawings without paying any creative work.

[0053] Figure 1 This is a graph of test data obtained by a homemade self-testing device provided in a specific embodiment of the present invention. DETAILED DESCRIPTION

[0054] The technical solutions in the embodiments of the present invention will be described clearly and completely below. Obviously, the embodiments described are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention and are not intended to limit the present invention.

[0055] Any specific numerical value disclosed herein (including the endpoints of a numerical range) is not limited to the exact value of the numerical value, but should be understood to also include values ​​close to the exact value, such as all possible values ​​within ±5% of the exact value. Moreover, for a disclosed numerical range, any combination of the endpoints of the range, between the endpoints and the specific points in the range, and between the specific points can be used to generate one or more new numerical ranges, and these new numerical ranges should also be considered to be specifically disclosed herein.

[0056] The terms used in this disclosure are intended only to describe specific exemplary embodiments and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "a", "an", and "the" as used in this disclosure may be intended to also include plural forms. The terms "comprise", "include", "contain", and "have" are inclusive and therefore illustrate the presence of the features, elements, compositions, steps, integers, operations, and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or their collections. Although the open term "comprising" should be understood as a non-limiting term for describing and claiming the various embodiments described in this disclosure, in some aspects, the term may alternatively be understood as a more restrictive and limited term, such as "consisting of" or "substantially consisting of". Thus, for any given embodiment of a narration composition, material, component, element, feature, integer, operation, and / or process step, the disclosure also particularly includes an embodiment consisting of or substantially consisting of such a composition, material, component, element, feature, integer, operation, and / or process step. In the case of "consisting of," alternative embodiments exclude any additional compositions, materials, components, elements, features, integers, operations and / or process steps, while in the case of "consisting essentially of," any additional compositions, materials, components, elements, features, integers, operations and / or process steps that materially affect the basic and novel characteristics are excluded from such embodiments, but any compositions, materials, components, elements, features, integers, operations and / or process steps that do not materially affect the basic and novel characteristics may be included in such embodiments.

[0057] Any method steps, processes, and operations described in this disclosure are not to be construed as necessarily requiring their performance in the particular order discussed or illustrated, unless expressly identified as a certain order of performance. It is also to be understood that additional or alternative steps may be used unless otherwise stated.

[0058] In this application, except for the contents explicitly described, any matters or issues not mentioned are directly applicable to those known in the art without any changes. Moreover, any embodiment described in this disclosure can be freely combined with one or more other embodiments described in this disclosure, and the technical solutions or technical ideas formed thereby are deemed to be part of the original disclosure or original record of this application, and should not be regarded as new content not disclosed or anticipated in this disclosure, unless a person skilled in the art considers that the combination is obviously unreasonable.

[0059] Unless otherwise specified, the terms used herein have the same meaning as commonly understood by those skilled in the art. If a term is defined herein and its definition is different from the commonly understood meaning in the art, the definition herein shall prevail.

[0060] Unless otherwise stated, when % is mentioned herein, it means wt.%.

[0061] The sunlight reflectivity of existing radiant cooling coatings is still low, and there is an urgent need for a coating and paint that can effectively reflect sunlight and have a significant cooling effect. In view of this, the present invention proposes the following technical solutions.

[0062] First aspect

[0063] The present invention provides a water-based radiation cooling paint, wherein the raw materials of the paint include inorganic fillers; wherein the inorganic fillers include mesoporous materials, metal oxides and carbonates.

[0064] It is worth noting that, in the prior art, when common metal oxides and rare earth materials are used as fillers in radiant cooling coatings, the overall performance of the resulting radiant cooling coatings still fails to meet increasingly stringent usage requirements. For example, existing radiant cooling coatings still suffer from defects such as poor scrub resistance and low contrast ratio. Therefore, the present invention utilizes a compound of mesoporous materials, metal oxides, and carbonates as fillers to produce the radiant cooling coating and a coating made from this filler. The present invention aims to utilize the radiation-reflecting properties of the mesoporous materials, metal oxides, and carbonates to enhance the reflectivity of sunlight and the emissivity of atmospheric windows.

[0065] In some embodiments of the present invention, the mesoporous material is mesoporous zirconium hydrogen phosphate, preferably flaky mesoporous zirconium hydrogen phosphate, more preferably flaky mesoporous zirconium hydrogen phosphate with a particle size of 0.5 to 0.8 μm.

[0066] It is worth noting that mesoporous zirconium hydrogen phosphate, especially flake-shaped mesoporous zirconium hydrogen phosphate, and more particularly flake-shaped mesoporous zirconium hydrogen phosphate with a particle size of 0.5 to 0.8 μm, has an optical band gap width greater than the optical band gap width of the sun. Therefore, it can be used as a radiative cooling material to improve the solar reflectivity and emissivity of paints and coatings made from such paints. Moreover, due to the morphological characteristics of its mesopores, mesoporous zirconium hydrogen phosphate can cause sunlight to be scattered multiple times within its voids, thereby further enhancing the radiation reflectivity of the coatings made from such paints. Furthermore, flake-shaped mesoporous zirconium hydrogen phosphate has a larger specific surface area. After spreading on the surface of the coated substrate, the flake-shaped mesoporous zirconium hydrogen phosphate with a larger specific surface area can provide the coatings made from such paints with excellent contrast ratio and durability.

[0067] In some embodiments of the present invention, the metal oxide is at least one of aluminum oxide, zirconium oxide, and magnesium oxide.

[0068] In some embodiments of the present invention, the carbonate is at least one of calcium carbonate, strontium carbonate, magnesium carbonate, and aluminum carbonate.

[0069] In some embodiments of the present invention, the aluminum oxide is spherical aluminum oxide.

[0070] In some embodiments of the present invention, the particle size of the aluminum oxide is 0.8-1.0 μm, for example, 0.85 μm, 0.9 μm, or 0.95 μm, or any value within a range consisting of any two of these values.

[0071] In some embodiments of the present invention, the calcium carbonate is spherical calcium carbonate.

[0072] In some embodiments of the present invention, the particle size of the calcium carbonate is 0.5 to 0.8 μm, for example, 0.55 μm, 0.6 μm, 0.65 μm, 0.7 μm, or 0.75 μm, or any value within a range consisting of any two of these values.

[0073] It is worth noting that in some embodiments of the present invention, spherical alumina and spherical calcium carbonate are used together as fillers, and the reflective radiation properties of spherical alumina and spherical calcium carbonate are used to enhance the reflectivity of sunlight and the emissivity of the atmospheric window, so that the coating made from the coating has better reflective radiation effect and better cooling effect.

[0074] Furthermore, in some embodiments of the present invention, spherical alumina with a particle size of 0.8 to 1.0 μm and spherical calcium carbonate with a particle size of 0.5 to 0.8 μm are used in combination as fillers, and the unique reflection and radiation properties of spherical alumina and spherical calcium carbonate within this particle size range are utilized to further enhance the solar reflectivity and the atmospheric window emissivity, thereby making the coating made from the coating have better reflection and radiation effects and better cooling effects.

[0075] In some embodiments of the present invention, the raw materials of the coating further include a thickener.

[0076] In some embodiments of the present invention, the content of the thickener is 0.01 to 0.10 wt.% of the total mass of the coating. For example, it can be any one of 0.02 wt.%, 0.03 wt.%, 0.04 wt.%, 0.05 wt.%, 0.06 wt.%, 0.07 wt.%, 0.08 wt.%, or 0.09 wt.%, or any value within the range consisting of any two of these values.

[0077] In some embodiments of the present invention, the thickener is at least one of cellulose ether, a cellulose ether derivative, polyurethane, and an inorganic thickener.

[0078] In some embodiments of the present invention, the raw materials of the coating further include a neutralizer.

[0079] In some embodiments of the present invention, the content of the neutralizing agent is 0.20-1.00 wt.% of the total mass of the coating. For example, it can be any one of 0.3 wt.%, 0.4 wt.%, 0.5 wt.%, 0.6 wt.%, 0.7 wt.%, 0.07 wt.%, 0.8 wt.%, or 0.9 wt.%, or any value within the range consisting of any two of these values.

[0080] In some embodiments of the present invention, the neutralizer is at least one of an organic amine neutralizer and an inorganic base neutralizer.

[0081] In some embodiments of the present invention, the raw materials of the coating further include a dispersant.

[0082] In some embodiments of the present invention, the content of the dispersant is 1.00 to 3.00 wt.% of the total mass of the coating. For example, it can be any one of 1.2 wt.%, 1.5 wt.%, 1.7 wt.%, 1.9 wt.%, 2 wt.%, 2.3 wt.%, 2.5 wt.%, or 2.7 wt.%, or any value within a range consisting of any two of these values.

[0083] In some embodiments of the present invention, the dispersant is at least one of a polycarboxylate dispersant and a polyether dispersant.

[0084] In some embodiments of the present invention, the raw materials of the coating further include a defoaming agent.

[0085] In some embodiments of the present invention, the content of the defoaming agent is 0.20-1.00 wt.% of the total mass of the coating. For example, it can be any one of 0.25 wt.%, 0.3 wt.%, 0.4 wt.%, 0.5 wt.%, 0.6 wt.%, 0.7 wt.%, 0.8 wt.% or 0.9 wt.%, or any value within the range consisting of any two of these values.

[0086] In some embodiments of the present invention, the defoaming agent is at least one of a silicone defoaming agent and a mineral oil defoaming agent.

[0087] In some embodiments of the present invention, the raw materials of the coating further include water-based resin.

[0088] In some embodiments of the present invention, the content of the water-based resin is 25.0-30.0 wt.% of the total mass of the coating. For example, it can be any one of 26 wt.%, 27 wt.%, 28 wt.%, 29 wt.%, or 29.5 wt.%, or any value within the range consisting of any two of these values.

[0089] In some embodiments of the present invention, the water-based resin is at least one of an acrylic copolymer emulsion, a silicone emulsion, and a fluorocarbon emulsion.

[0090] In some embodiments of the present invention, the viscosity of the acrylic copolymer emulsion is 300 to 1000 mPa·s. For example, it can be any one of 400 mPa·s, 500 mPa·s, 600 mPa·s, 700 mPa·s, 800 mPa·s, or 900 mPa·s, or any value within a range consisting of any two of these values.

[0091] In some embodiments of the present invention, the raw materials of the coating further include a film-forming aid.

[0092] In some embodiments of the present invention, the content of the film-forming aid is 1.00-5.00 wt.% of the total mass of the coating. For example, it can be any one of 2 wt.%, 3 wt.%, or 4 wt.%, or any value within the range of any two of these values.

[0093] In some embodiments of the present invention, the film-forming aid is at least one of 2,2,4-trimethylpentanediol monoisobutyrate, diisobutyl succinate, and dipropylene glycol butyl ether.

[0094] In some embodiments of the present invention, the raw materials of the coating further include a fungicide.

[0095] In some embodiments of the present invention, the content of the fungicide is 1.00-3.00 wt.% of the total mass of the coating. For example, it can be any one of 2 wt.%, 2.3 wt.%, or 2.5 wt.%, or any value within the range of any two of these values.

[0096] In some embodiments of the present invention, the fungicide is at least one of an organic sulfur fungicide, an organic bromine fungicide, a quaternary ammonium salt fungicide, and an isothiazolinone fungicide.

[0097] In some embodiments of the present invention, the raw materials of the coating further include water.

[0098] In some embodiments of the present invention, the water content is 25.0-45.0 wt.% of the total mass of the coating. For example, it can be any one of 29 wt.%, 30 wt.%, or 40 wt.%, or any value within the range of any two of these values.

[0099] In some embodiments of the present invention, deionized water is used.

[0100] Second aspect

[0101] The present invention provides a method for preparing the above-mentioned water-based radiant cooling paint, which comprises the following steps: S1, adding water, a thickener, a neutralizer, a dispersant, and a defoaming agent into a dispersion tank; S2, adding an inorganic filler into the dispersion tank; S3, mixing a water-based resin, a film-forming aid, and a fungicide with the material obtained in step S2, and dispersing them in the dispersion tank to obtain the water-based radiant cooling paint.

[0102] In some embodiments of the present invention, in step S1, the mass ratio of water, thickener, neutralizer, dispersant and defoaming agent is (500-650):(0.5-2.0):(5-10):(10-20):(10-20).

[0103] In some embodiments of the present invention, in step S1, the water, thickener, neutralizer, dispersant, and defoamer are added at a rotation speed of 500 to 800 rpm.

[0104] In some embodiments of the present invention, in step S1, the water, thickener, neutralizer, dispersant, and defoamer are dispersed in the dispersion tank for 0.2 to 0.5 hours.

[0105] In some embodiments of the present invention, in step S1, the temperature in the dispersion tank is (5-10° C.) to (40-55° C.).

[0106] In some embodiments of the present invention, in step S2, the mass ratio of the inorganic filler to the material obtained in step S1 is (4.0-4.5):(2.0-3.5).

[0107] In some embodiments of the present invention, in step S2, the rotation speed of the dispersion tank is 1500-2500 rpm, and the dispersion time is 0.5-1.0 h.

[0108] In some embodiments of the present invention, in step S2, the temperature in the dispersion tank is 5-55°C.

[0109] In some embodiments of the present invention, in step S3, the mass ratio of the aqueous resin, film-forming aid, fungicide and the material obtained in step S2 is (20-25):(1.2-1.8):(0.5-1.0).

[0110] In some embodiments of the present invention, in step S3, the rotation speed of the dispersion tank is 500-800 rpm, and the dispersion time is 0.2-0.5 h.

[0111] In some embodiments of the present invention, in step S3, the temperature in the dispersion tank is 5-40°C.

[0112] According to Kirchhoff's laws and the principle of infrared molecular vibration, the functional groups of the film-forming material affect the coating's solar absorption and infrared radiation effects. Polymer molecules containing π bonds or conjugated π bonds are more likely to absorb solar radiation, so when selecting polymers, polymer materials containing such functional groups should be avoided as much as possible. In addition, functional groups such as CX, Si-O-Si, and Si-OC bonds can produce high emissivity within the atmospheric window. Therefore, the present invention uses an acrylate copolymer emulsion as the coating film-forming material.

[0113] The third aspect

[0114] The present invention provides a coating, which is prepared from the above-mentioned water-based radiation cooling coating, or prepared from the water-based radiation cooling coating obtained by the above-mentioned method.

[0115] In some embodiments of the present invention, the reflectivity of the coating is greater than or equal to 94%.

[0116] In some embodiments of the present invention, the reflectivity of the coating is greater than or equal to 94.15%.

[0117] The fourth aspect

[0118] The present invention provides a method for preparing the above-mentioned coating, which comprises coating the above-mentioned water-based radiation cooling coating or the water-based radiation cooling coating obtained by the above-mentioned method on the surface of a substrate and drying the coating.

[0119] Example 1

[0120] At 25°C and a rotation speed of 600 rpm, 30.0 parts by weight of deionized water, 0.05 parts by weight of cellulose thickener HBR250, 0.50 parts by weight of organic amine neutralizer SN95, 1.00 parts by weight of polycarboxylate dispersant SN5040, and 1.00 parts by weight of mineral oil defoamer 2410AC were added to the dispersion tank in sequence and dispersed for 0.5 h. After dispersion, 30.0 parts by weight of spherical alumina with a particle size of 0.8-1.0 μm, 8.00 parts by weight of spherical calcium carbonate with a particle size of 0.5-0.8 μm, and 2.00 parts by weight of flaky mesoporous zirconium hydrogen phosphate with a particle size of 0.5-0.8 μm were added to the dispersion tank in sequence, the rotation speed was adjusted to 2000 rpm, and high-speed dispersion was carried out at 30°C for 0.5 h to obtain a first mixed liquid.

[0121] After dispersion is completed, 25.0 parts by weight of acrylic copolymer emulsion 706T, 1.45 parts by weight of film-forming aid 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate, and 1.00 parts by weight of fungicide 5-chloro-2-methyl-4-isothiazoline-3-one are added to the first mixed liquid, and dispersion is continued for 0.5 hours. After dispersion is completed, the above-mentioned water-based radiation cooling coating is obtained.

[0122] The water-based radiation cooling coating is evenly coated on the surface of a substrate, and dried at a constant temperature and humidity for 7 days to obtain a radiation cooling coating.

[0123] Example 2

[0124] Under the conditions of 25°C and a rotation speed of 600 rpm, 29.5 parts by mass of deionized water, 0.05 parts by mass of cellulose thickener HBR250, 0.50 parts by mass of organic amine neutralizer SN95, 1.00 parts by mass of polycarboxylate dispersant SN5040, and 1.00 parts by mass of mineral oil defoamer 2410AC were added to the dispersion tank in sequence and dispersed for 0.5 h. After dispersion, 30.0 parts by mass of spherical alumina with a particle size of 0.8-1.0 μm, 8.00 parts by mass of spherical calcium carbonate with a particle size of 0.5-0.8 μm, and 2.50 parts by mass of flaky mesoporous zirconium hydrogen phosphate with a particle size of 0.5-0.8 μm were added to the dispersion tank in sequence, the rotation speed was adjusted to 2000 rpm, and high-speed dispersion was carried out for 0.5 h to obtain the first mixed liquid.

[0125] After dispersion is completed, 25.0 parts by mass of acrylic copolymer emulsion 706T, 1.45 parts by mass of film-forming aid 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate, and 1.00 parts by mass of fungicide 5-chloro-2-methyl-4-isothiazoline-3-one are added to the first mixed liquid, and dispersion is continued for 0.5 hours. After dispersion is completed, the above-mentioned water-based radiation cooling coating is obtained.

[0126] The water-based radiation cooling coating is evenly coated on the surface of a substrate, and dried at a constant temperature and humidity for 7 days to obtain a radiation cooling coating.

[0127] Example 3

[0128] Under the conditions of 25°C and a rotation speed of 600 rpm, 29.0 parts by mass of deionized water, 0.05 parts by mass of cellulose thickener HBR250, 0.50 parts by mass of organic amine neutralizer SN95, 1.00 parts by mass of polycarboxylate dispersant SN5040, and 1.00 parts by mass of mineral oil defoamer 2410AC were added to the dispersion tank in sequence and dispersed for 0.5 h. After dispersion, 30.0 parts by mass of spherical alumina with a particle size of 0.8-1.0 μm, 8.00 parts by mass of spherical calcium carbonate with a particle size of 0.5-0.8 μm, and 3.00 parts by mass of flaky mesoporous zirconium hydrogen phosphate with a particle size of 0.5-0.8 μm were added to the dispersion tank in sequence, the rotation speed was adjusted to 2000 rpm, and high-speed dispersion was carried out for 0.5 h to obtain the first mixed liquid.

[0129] After dispersion is completed, 25.0 parts by mass of acrylic copolymer emulsion 706T, 1.45 parts by mass of film-forming aid 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate, and 1.00 parts by mass of fungicide 5-chloro-2-methyl-4-isothiazoline-3-one are added to the first mixed liquid, and dispersion is continued for 0.5 hours. After dispersion is completed, the above-mentioned water-based radiation cooling coating is obtained.

[0130] The water-based radiation cooling coating is evenly coated on the surface of a substrate, and dried at a constant temperature and humidity for 7 days to obtain a radiation cooling coating.

[0131] Example 4

[0132] Under the conditions of 25°C and a rotation speed of 600 rpm, 28.0 parts by mass of deionized water, 0.05 parts by mass of cellulose thickener HBR250, 0.50 parts by mass of organic amine neutralizer SN95, 1.00 parts by mass of polycarboxylate dispersant SN5040, and 1.00 parts by mass of mineral oil defoamer 2410AC were added to the dispersion tank in sequence and dispersed for 0.5 h. After dispersion, 30.0 parts by mass of spherical alumina with a particle size of 0.8-1.0 μm, 8.00 parts by mass of spherical calcium carbonate with a particle size of 0.5-0.8 μm, and 4.00 parts by mass of flaky mesoporous zirconium hydrogen phosphate with a particle size of 0.5-0.8 μm were added to the dispersion tank in sequence, the rotation speed was adjusted to 2000 rpm, and high-speed dispersion was carried out for 0.5 h to obtain the first mixed liquid.

[0133] After dispersion is completed, 25.0 parts by mass of acrylic copolymer emulsion 706T, 1.45 parts by mass of film-forming aid 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate, and 1.00 parts by mass of fungicide 5-chloro-2-methyl-4-isothiazoline-3-one are added to the first mixed liquid, and dispersion is continued for 0.2 to 0.5 hours. After dispersion is completed, the above-mentioned water-based radiation cooling coating is obtained.

[0134] The water-based radiation cooling coating is evenly coated on the surface of a substrate, and dried at a constant temperature and humidity for 7 days to obtain a radiation cooling coating.

[0135] Comparative Example 1

[0136] Under the conditions of 25°C and a rotation speed of 600 rpm, 28.0 parts by mass of deionized water, 0.05 parts by mass of cellulose thickener HBR250, 0.50 parts by mass of organic amine neutralizer SN95, 1.00 parts by mass of polycarboxylate dispersant SN5040, and 1.00 parts by mass of mineral oil defoamer 2410AC were sequentially added to the dispersion tank and dispersed for 0.5 h. After dispersion, 32.0 parts by mass of spherical alumina with a particle size of 0.8 to 1.0 μm and 10.00 parts by mass of spherical calcium carbonate with a particle size of 0.5 to 0.8 μm were sequentially added to the dispersion tank, the rotation speed was adjusted to 2000 rpm, and high-speed dispersion was carried out for 0.5 h to obtain a first mixed liquid.

[0137] After dispersion is completed, 25.0 parts by mass of acrylic copolymer emulsion 706T, 1.45 parts by mass of film-forming aid 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate, and 1.00 parts by mass of fungicide 5-chloro-2-methyl-4-isothiazoline-3-one are added to the first mixed liquid, and dispersion is continued for 0.2 to 0.5 hours. After dispersion is completed, the above-mentioned water-based radiation cooling coating is obtained.

[0138] The water-based radiation cooling coating is evenly coated on the surface of a substrate, and dried at a constant temperature and humidity for 7 days to obtain a radiation cooling coating.

[0139] Comparative Example 2

[0140] Under the conditions of 25°C and a rotation speed of 600 rpm, 28.0 parts by mass of deionized water, 0.05 parts by mass of cellulose thickener HBR250, 0.50 parts by mass of organic amine neutralizer SN95, 1.00 parts by mass of polycarboxylate dispersant SN5040, and 1.00 parts by mass of mineral oil defoaming agent 2410AC were sequentially added to the dispersion tank and dispersed for 0.5 h. After dispersion, 30.0 parts by mass of spherical alumina with a particle size of 0.8-1.0 μm, 8.00 parts by mass of spherical calcium carbonate with a particle size of 0.5-0.8 μm, and 4.00 parts by mass of spherical mesoporous zirconium hydrogen phosphate with a particle size of 8.0-15.0 μm were sequentially added to the dispersion tank, the rotation speed was adjusted to 2000 rpm, and high-speed dispersion was carried out for 0.5 h to obtain the first mixed liquid.

[0141] After dispersion is completed, 25.0 parts by mass of acrylic copolymer emulsion 706T, 1.45 parts by mass of film-forming aid 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate, and 1.00 parts by mass of fungicide 5-chloro-2-methyl-4-isothiazoline-3-one are added to the first mixed liquid, and dispersion is continued for 0.2 to 0.5 hours. After dispersion is completed, the above-mentioned water-based radiation cooling coating is obtained.

[0142] The water-based radiation cooling coating is evenly coated on the surface of a substrate, and dried at a constant temperature and humidity for 7 days to obtain a radiation cooling coating.

[0143] Comparative Example 3

[0144] At 25°C and a rotation speed of 600 rpm, 60.0 parts by mass of deionized water, 0.05 parts by mass of cellulose thickener HBR250, 0.50 parts by mass of organic amine neutralizer SN95, 1.00 parts by mass of polycarboxylate dispersant SN5040, and 1.00 parts by mass of mineral oil defoamer 2410AC were added to the dispersion tank in sequence and dispersed for 0.5 h. After dispersion, 10.00 parts by mass of flaky mesoporous zirconium hydrogen phosphate with a particle size of 0.5 to 0.8 μm was added to the dispersion tank, the rotation speed was adjusted to 2000 rpm, and high-speed dispersion was carried out for 0.5 h to obtain a first mixed liquid.

[0145] After dispersion is completed, 25.0 parts by mass of acrylic copolymer emulsion 706T, 1.45 parts by mass of film-forming aid 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate, and 1.00 parts by mass of fungicide 5-chloro-2-methyl-4-isothiazoline-3-one are added to the first mixed liquid, and dispersion is continued for 0.2 to 0.5 hours. After dispersion is completed, the above-mentioned water-based radiation cooling coating is obtained.

[0146] The water-based radiation cooling coating is evenly coated on the surface of a substrate, and dried at a constant temperature and humidity for 7 days to obtain a radiation cooling coating.

[0147] The performance test results of the coatings obtained in the above embodiments and comparative examples are listed in the following Table 1:

[0148] Among them, the solar reflectance is determined in accordance with Appendix A of JG / T235-2014 "Architectural Reflective Thermal Insulation Coatings". This method uses ultraviolet, visible light, and near-infrared spectrophotometers with integrating spheres to accurately measure the reflectance of materials at different wavelengths. Based on the relative energy distribution of sunlight within the wavelength range of thermal rays, the solar reflectance of the material within a certain wavelength range is calculated using the weighted average method. Each sample is tested three times, and the average value is taken as the average solar reflectance. The atmospheric window emissivity is tested using a Fourier analysis spectrometer with a gold integrating sphere. The test range is 2500-25000nm, and the wavelength interval is 250nm. After the test, the 800-1300nm is intercepted as the atmospheric window emissivity data. Each sample is tested three times, and the average value is taken as the average atmospheric window emissivity. The contrast ratio test method is carried out in accordance with the provisions of Chapter 6 of GB / T23981.1-2019. Each sample is tested three times, and the average value is taken as the average contrast ratio.

[0149] Table 1 Performance test results of the coatings obtained in each embodiment and comparative example

[0150]

[0151] The coatings obtained in the above four examples were tested according to the standard for superior topcoat in GB / T9755-2024 "Synthetic Resin Emulsion Wall Coatings". The test results are shown in Table 2:

[0152] Table 2 Application performance test results of the coating obtained in the embodiment of the present invention

[0153]

[0154] See also Figure 1 The test time is 8:30-15:00 on March 25, 2025, and the test location is Hangzhou, Zhejiang Province. During the test period, the average solar radiation power is 949.56W / m 2 The average wind speed was 0.77 m / s and the average ambient humidity was 20.98 RH%. The three white paint samples used for temperature testing all had a lightness value of approximately 98.50 and a dry film thickness of approximately 200 μm.

[0155] The test results showed that the average temperature of commercial white paint was 34.62°C, the average temperature of commercial reflective insulation white paint was 32.94°C, and the average temperature of radiant cooling white paint was 28.60°C. The average ambient temperature was 31.73°C. The average temperature of the radiant cooling white paint was significantly lower than that of the comparison white paint and the ambient temperature, demonstrating a significant cooling effect.

[0156] The above is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art who is familiar with the technical field can easily think of changes or replacements within the technical scope disclosed by the present invention, which should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims. In addition, the principle and implementation of the present invention are explained in detail in the specification using specific examples. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. The content of this specification should not be understood as limiting the present invention.

Claims

1. A water-based radiant cooling paint, characterized in that: The raw materials of the coating include inorganic fillers; Wherein, the inorganic filler includes mesoporous materials, metal oxides and carbonates.

2. The water-based radiant cooling paint according to claim 1, characterized in that: The mesoporous material is mesoporous zirconium hydrogen phosphate, preferably a flaky mesoporous zirconium hydrogen phosphate, more preferably a flaky mesoporous zirconium hydrogen phosphate with a particle size of 0.5 to 0.8 μm.

3. The water-based radiant cooling paint according to claim 1, characterized in that: The metal oxide is at least one of aluminum oxide, zirconium oxide, and magnesium oxide, and / or the carbonate is at least one of calcium carbonate, strontium carbonate, magnesium carbonate, and aluminum carbonate; Preferably, the alumina is spherical alumina; Preferably, the particle size of the aluminum oxide is 0.8 to 1.0 μm; Preferably, the calcium carbonate is spherical calcium carbonate; Preferably, the particle size of the calcium carbonate is 0.5 to 0.8 μm.

4. The water-based radiant cooling paint according to claim 1, characterized in that: Have at least one of the following characteristics: The raw materials of the coating further include a thickener, preferably the content of the thickener is 0.01 to 0.10 wt.% of the total mass of the coating, preferably the thickener is at least one of cellulose ether, cellulose ether derivatives, polyurethane, and inorganic thickeners; The raw materials of the coating further include a neutralizer, preferably the content of the neutralizer is 0.20-1.00 wt.% of the total mass of the coating, preferably the neutralizer is at least one of an organic amine neutralizer and an inorganic base neutralizer; The raw materials of the coating further include a dispersant, preferably the content of the dispersant is 1.00 to 3.00 wt.% of the total mass of the coating, preferably the dispersant is at least one of a polycarboxylate dispersant and a polyether dispersant; The raw materials of the coating further include a defoamer, preferably the content of the defoamer is 0.20-1.00 wt.% of the total mass of the coating, preferably the defoamer is at least one of a silicone defoamer and a mineral oil defoamer; The raw materials of the coating further include a water-based resin, preferably the content of the water-based resin is 25.0-30.0 wt.% of the total mass of the coating, preferably the water-based resin is at least one of an acrylate copolymer emulsion, a silicone emulsion, and a fluorocarbon emulsion, more preferably the viscosity of the acrylate copolymer emulsion is 300-1000 mPa·s; The raw materials of the coating further include a film-forming aid, preferably the content of the film-forming aid is 1.00 to 5.00 wt.% of the total mass of the coating, preferably the film-forming aid is at least one of 2,2,4-trimethyl 1,3-pentanediol monoisobutyrate, diisobutyl succinate, and dipropylene glycol butyl ether; The raw materials of the coating further include a fungicide, preferably the content of the fungicide is 1.00 to 3.00 wt.% of the total mass of the coating, preferably the fungicide is at least one of an organic sulfur fungicide, an organic bromine fungicide, a quaternary ammonium salt fungicide, and an isothiazolinone fungicide; The raw materials of the coating further include water, and preferably the content of water is 25.0-45.0 wt.% of the total mass of the coating.

5. A method for preparing the water-based radiant cooling coating according to any one of 1 to 4 above, characterized in that: The method comprises the following steps: S1, put water, thickener, neutralizer, dispersant and defoamer into the dispersion tank; S2, adding an inorganic filler into the dispersion tank; S3, mixing the water-based resin, film-forming aid, and fungicide with the material obtained in step S2, and dispersing them in the dispersion tank to obtain the water-based radiant cooling paint.

6. The method according to claim 5, characterized in that In step S1, at least one of the following characteristics is present: The mass ratio of water, thickener, neutralizer, dispersant and defoamer is (500-650):(0.5-2.0):(5-10):(10-20):(10-20); adding the water, thickener, neutralizer, dispersant, and defoamer at a rotation speed of 500 to 800 rpm; The dispersion time of the water, thickener, neutralizer, dispersant and defoamer in the dispersion tank is 0.2 to 0.5 hours; The temperature in the dispersion tank is (5-10° C.) to (40-55° C.).

7. The method according to claim 5, characterized in that In step S2, at least one of the following characteristics is present: The mass ratio of the inorganic filler to the material obtained in step S1 is (4.0-4.5):(2.0-3.5); The speed of the dispersion cylinder is 1500-2500 rpm, and the dispersion time is 0.5-1.0 h; The temperature in the dispersion tank is 5-55°C.

8. The method according to claim 5, characterized in that In step S3, at least one of the following characteristics is present: The mass ratio of the water-based resin, film-forming aid, fungicide and the material obtained in step S2 is (20-25): (1.2-1.8): (0.5-1.0); The speed of the dispersion cylinder is 500-800 rpm, and the dispersion time is 0.2-0.5 h; The temperature in the dispersion tank is 5-40°C.

9. A coating, characterized in that The coating is made from the water-based radiation cooling coating according to any one of claims 1 to 4, or is made from the water-based radiation cooling coating obtained by the method according to any one of claims 5 to 8; The reflectivity of the coating is greater than or equal to 94%, preferably greater than or equal to 94.15%.

10. A method for preparing a coating according to claim 9, characterized in that The water-based radiant cooling paint according to any one of claims 1 to 4 or the water-based radiant cooling paint obtained by the method according to any one of claims 5 to 8 is applied to the surface of a substrate and dried to obtain the coating.

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