A reflective heat-insulating multi-colored coating and its preparation method and application

Abstract

The present invention discloses a reflective heat-insulating multi-color coating, a preparation method and application thereof, and belongs to the technical field of coating preparation. The reflective heat-insulating multi-color coating uses a barrier-type heat-insulating coating as a bottom coating, a reflective heat-insulating coating as a surface multi-color coating, and an organic reflective pigment as a multi-color pigment; the heat-insulating filler in the barrier-type heat-insulating coating is compounded with SiO2 aerogel, hollow ceramic microspheres and hollow glass microspheres in a mass ratio of 1:1.2:0.3; the reflective filler in the reflective heat-insulating coating is an infrared reflective pigment. The reflective heat-insulating multi-color coating can reduce building energy consumption and carbon emissions in a variety of climate zones, and is particularly suitable for temperate continental climate zones and temperate monsoon climate zones, and can reduce about 2‑4 KWh / m per year. 2 Energy consumption and 1‑3kg / m 2 of carbon emissions.

Description

Technical Field

[0001] The invention belongs to the technical field of coating preparation, and in particular relates to a reflective heat-insulating multi-colored coating and a preparation method and application thereof. Background Art

[0002] It is urgent to reduce energy consumption during the operation phase of buildings. As the medium through which buildings are directly exposed to the atmospheric environment, exterior wall coatings have a direct impact on building energy consumption.

[0003] In order to reflect sunlight to a greater extent, reflective heat-insulating architectural coatings are usually white or light-colored in appearance, but this cannot meet people's requirements for architectural beauty, and the single color limits the marketization of heat-insulating architectural coatings. At present, the most decorative coating is colorful imitation stone coating, which can show a rich imitation stone appearance after one application. Therefore, the preparation of colorful coatings with reflective heat-insulating functions can combine the advantages of both, making it have both heat-insulating functionality and high decorativeness. Summary of the invention

[0004] In view of the problems existing in the above-mentioned prior art, the present invention proposes a reflective heat-insulating multi-color coating and a preparation method and application thereof.

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

[0006] A reflective heat-insulating multi-color coating, which uses a barrier-type heat-insulating coating as a bottom layer, a reflective heat-insulating coating as a surface multi-color coating, and an organic reflective pigment as a multi-color pigment; the heat-insulating filler in the barrier-type heat-insulating coating is compounded by SiO2 aerogel, hollow ceramic microspheres and hollow glass microspheres in a mass ratio of 1:1.2:0.3; the reflective filler in the reflective heat-insulating coating is a mixture of one or more infrared reflective pigments selected from Alritis-800, IR1000 and PFR-404.

[0007] Furthermore, the barrier-type thermal insulation coating includes the following raw materials in percentage by mass: 0.3% hydroxyethyl cellulose ether, 0.1% multifunctional amine additive, 0.2% wetting agent, 0.5% dispersant, 0.2% defoaming agent, 5-25% rutile titanium dioxide, 13% calcium carbonate, 5-20% thermal insulation filler, 5% kaolin, 30% polyacrylic acid emulsion, 2.5% film-forming additive, 0.5% leveling agent, 1% bactericide, 0.2% associative thickener, and the balance water.

[0008] Furthermore, the preparation method of the barrier-type thermal insulation coating comprises the following steps: weighing the raw materials according to the mass ratio, adding hydroxyethyl cellulose ether, a wetting agent, a dispersant and a part of the defoaming agent to a part of the water at a speed of 500 rpm, adding a multifunctional amine auxiliary agent after dispersing for 10 minutes, increasing the speed to 2000 rpm, and after the viscosity of the system is uniform and remains unchanged, adding rutile titanium dioxide, kaolin and calcium carbonate, increasing the speed to 3000 rpm, and dispersing for 20 minutes; adjusting the speed to 1500 rpm, and then adding polyacrylic acid emulsion, film-forming auxiliary agent, thermal insulation filler, leveling agent, associative thickener, remaining defoaming agent and remaining water in turn, and dispersing for another 20 minutes to obtain the barrier-type thermal insulation coating.

[0009] Furthermore, the reflective thermal insulation coating comprises the following raw materials in percentage by mass: 50% reflective thermal insulation coating base paint, 20% 7wt% lithium magnesium silicate solution, and 30% reflective thermal insulation coating varnish.

[0010] Furthermore, the base paint includes the following raw materials in percentage by mass: 0.2% wetting agent, 0.2% dispersant, 0.9% thickener, 2-15% infrared reflective pigment, 6% kaolin, 0.2% multifunctional amine additive, 0.6% propylene glycol, 1% film-forming additive, 26% polyacrylic acid emulsion, 0.2% defoamer, 2% bactericide, 7% 7wt% lithium magnesium silicate solution and the balance water.

[0011] Furthermore, the varnish comprises the following raw materials in percentage by mass: 33% polyacrylic acid emulsion, 1.3% film-forming aid, 2% suspending agent, 1% bactericide and the balance water.

[0012] Furthermore, the preparation method of the reflective thermal insulation coating comprises the following steps:

[0013] 1) Weigh the base paint raw materials by mass, add a wetting agent, a dispersant, a thickener, an infrared reflective pigment, kaolin and a portion of a defoamer to water at a speed of 500 rpm, adjust the speed to 1500 rpm, add a multifunctional amine additive after 15 minutes, increase the speed to 2500 rpm, add propylene glycol, a film-forming aid, a polyacrylic acid emulsion and the remaining defoamer and a fungicide after 20 minutes, reduce the speed to 2000 rpm, add a 7wt% lithium magnesium silicate solution dropwise after 15 minutes, adjust the speed to 3000 rpm, and obtain a reflective thermal insulation coating base paint after 20 minutes;

[0014] 2) weighing the varnish raw materials by mass, adding the polyacrylic acid emulsion, the film-forming aid, the suspending agent, the bactericide and water at a rotation speed of 500 rpm, stirring, and obtaining a reflective thermal insulation coating varnish;

[0015] 3) The prepared reflective thermal insulation coating base paint is toned using an organic reflective pigment, then added to a lithium magnesium silicate solution for cutting and granulation, and then added with the prepared reflective thermal insulation coating varnish (continuous phase), and mixed evenly to obtain a reflective thermal insulation coating.

[0016] Furthermore, the organic reflective pigment is a mixture of one or more of perylene red, chloroisoindolinone yellow, phthalocyanine blue and perylene black.

[0017] Furthermore, the thickness of the bottom layer coating is 400 μm, and the thickness of the surface multi-colored coating is 200 μm.

[0018] The present invention also provides a method for preparing the reflective heat-insulating colorful coating, wherein the reflective heat-insulating colorful coating is composed of two coatings, namely, a barrier-type heat-insulating coating and a reflective heat-insulating coating, after being coated and dried; the barrier-type heat-insulating coating is used as a base coating with a thickness of 400 μm, and the reflective heat-insulating coating is used as a surface colorful coating with a thickness of 200 μm.

[0019] The present invention also provides an application of the reflective heat-insulating multi-colored paint as a building paint for temperate monsoon climate zones and temperate continental climate zones.

[0020] Compared with the prior art, the present invention has the following advantages and technical effects:

[0021] The present invention uses SiO2 aerogel, hollow glass microspheres and hollow ceramic microspheres as the insulation filler of the barrier type thermal insulation coating, uses infrared reflective pigments as the insulation filler of the reflective thermal insulation coating, and uses organic reflective pigments as colorful pigments to prepare a high barrier and high reflective colorful coating. The coating uses the barrier type thermal insulation coating as the bottom coating and the reflective thermal insulation coating as the surface colorful coating. Through the combination of the two, the solar reflectivity (TSR) and near infrared reflectivity (NIR) of the prepared reflective thermal insulation colorful coating are effectively improved, and can reduce about 2-4KWh / m per year. 2 Energy consumption and 1-3kg / m 2 of carbon emissions. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0023] Figure 1 This is the reflection spectrum of the coating with different addition amounts of infrared reflective pigment;

[0024] Figure 2 The reflectance spectra of the coating with different red pigments added;

[0025] Figure 3 The reflectance spectra of the coating with different yellow pigments added;

[0026] Figure 4 The reflectance spectra of the coating with different black pigments added;

[0027] Figure 5 This is the appearance of the building model. DETAILED DESCRIPTION

[0028] Various exemplary embodiments of the present invention will now be described in detail. This detailed description should not be considered as limiting the present invention, but should be understood as a more detailed description of certain aspects, features, and embodiments of the present invention.

[0029] It should be understood that the terms described in the present invention are only for describing special embodiments and are not intended to limit the present invention. In addition, for the numerical range in the present invention, it should be understood that each intermediate value between the upper and lower limits of the scope is also specifically disclosed. Each smaller range between the intermediate value in any stated value or stated range and any other stated value or intermediate value in the described range is also included in the present invention. The upper and lower limits of these smaller ranges can be independently included or excluded in the scope.

[0030] Unless otherwise indicated, all technical and scientific terms used herein have the same meanings as those generally understood by those skilled in the art. Although the present invention describes only preferred methods and materials, any methods and materials similar or equivalent to those described herein may also be used in the implementation or testing of the present invention. All documents mentioned in this specification are incorporated by reference to disclose and describe the methods and / or materials associated with the documents. In the event of a conflict with any incorporated document, the content of this specification shall prevail.

[0031] It will be apparent to those skilled in the art that various modifications and variations may be made to the specific embodiments of the present invention description without departing from the scope or spirit of the present invention. Other embodiments derived from the present invention description will be apparent to those skilled in the art. The present application description and examples are exemplary only.

[0032] The words “include,” “including,” “have,” “contain,” etc. used in this document are open-ended terms, meaning including but not limited to.

[0033] The following raw materials and instruments are used in the following examples of the present invention:

[0034] Hydroxyethyl cellulose ether (HBR-250): Ashland Chemical Company, USA; multifunctional amine additive (AMP-95), wetting agent (CF-10) leveling agent (RM-2020), associative thickener (TT-935): Dow Chemical Company, USA; polycarboxylic acid sodium salt dispersant (P-30): French Gaotai Additive Company; mineral oil defoamer (NXZ): Dow Chemical Company, USA; rutile titanium dioxide (R-966): Sichuan Longmang Titanium Industry Co., Ltd.; heavy calcium carbonate: Guangdong Jinrui New Materials Technology Co., Ltd.; kaolin: Hebei Zhuofei Mineral Products Co., Ltd.; polyacrylic acid emulsion (RS-2788): Guangdong Badfu Group Co., Ltd.; film-forming additive dodecanol ester: Runtai New Materials Co., Ltd.; SiO2 aerogel slurry (AG-Paste): Shenzhen Zhongning Technology Co., Ltd., hollow ceramic microspheres (HJY-02): Shanghai Huijingya Nano New Materials Co., Ltd.; hollow glass microspheres (FT-920): Guangdong Fantian Technology Co., Ltd.; iron red (Y4101), iron yellow (Y2042), iron black (BK9011): Guangdong Kedi New Materials Technology Co., Ltd.; ferrosilicon red (PR101), silicon chrome yellow (PBR24), ferrochrome black (PBR29): Foshan Lepei Chemical Co., Ltd.; perylene red (P1260), perylene black (P0086), chloroisoindolinone yellow (P3110): Ranbar Chemical Company, Germany.

[0035] Vertical high-speed disperser (SDF-400): Jiangyin Fine Chemical Machinery Factory; Stormer viscometer (STM-ⅠV): Dongguan Zhenglan Precision Instrument Co., Ltd.; Paint film thickness gauge (Qnix4500): QNIX Company of Germany; Multi-channel temperature recorder (CTR-380-16): Guangzhou Chuangfenjia Instrument Co., Ltd.; UV-Vis-NIR spectrophotometer (Lambda1050): PerkinElmer Co., Ltd. of the United States; Laser thermal conductivity meter (LFA-467): NETZSCH Company of Germany.

[0036] The invention provides a reflective heat-insulating multi-color coating, wherein the reflective heat-insulating multi-color coating uses a barrier-type heat-insulating coating as a bottom coating, a reflective heat-insulating coating as a surface multi-color coating, and an organic reflective pigment as a multi-color pigment; the heat-insulating filler in the barrier-type heat-insulating coating is compounded by SiO2 aerogel (AG-Paste), hollow ceramic microspheres (HJY-02) and hollow glass microspheres (FT-920) in a mass ratio of 1:1.2:0.3; the reflective filler in the reflective heat-insulating coating is a mixture of one or more infrared reflective pigments Alritis-800, IR1000 and PFR-404, preferably Alritis-800.

[0037] In the following embodiments of the present invention, the barrier-type thermal insulation coating comprises the following components in percentage by mass: 0.3% hydroxyethyl cellulose ether (HBR-250), 0.1% multifunctional amine additive (AMP-95), 0.2% wetting agent (CF-10), 0.5% dispersant (P-30), 0.2% defoaming agent (NXZ), 5-25% rutile titanium dioxide (R-966), 13% calcium carbonate, 5-20% thermal insulation filler, 5% kaolin, 30% polyacrylic acid emulsion (RS-2788), 2.5% film-forming additive (dodecanol ester), 0.5% leveling agent (RM-2020), 1% bactericide, 0.2% associative thickener (TT-935), and the balance water.

[0038] The preparation method of the barrier-type thermal insulation coating comprises the following steps: weighing raw materials according to mass ratio, adding hydroxyethyl cellulose ether, a wetting agent, a dispersant and a part of defoaming agent to a part of water at a rotation speed of 500 rpm, adding a multifunctional amine auxiliary agent after dispersing for 10 minutes, increasing the rotation speed to 2000 rpm, adding rutile titanium dioxide, kaolin and calcium carbonate after the viscosity of the system is uniform and remains unchanged, increasing the rotation speed to 3000 rpm, and dispersing for 20 minutes; adjusting the rotation speed to 1500 rpm, and then adding polyacrylic acid emulsion, film-forming auxiliary agent, thermal insulation filler, leveling agent, associative thickener, remaining defoaming agent and remaining water in sequence, and dispersing for another 20 minutes to obtain the barrier-type thermal insulation coating.

[0039] In the following embodiments of the present invention, the reflective thermal insulation coating comprises the following raw materials in mass percentage: 50% of reflective thermal insulation coating base paint, 20% of 7wt% lithium magnesium silicate solution, and 30% of reflective thermal insulation coating varnish. The base paint comprises the following components in mass percentage: 0.2% of wetting agent (CF-10), 0.2% of dispersant (P-30), 0.9% of thickener (HBR-250), 15% of infrared reflective pigment Altiris-8002-15%, 6% of kaolin, 0.2% of multifunctional amine auxiliary agent (AMP-95), 0.6% of propylene glycol, 1% of film-forming auxiliary agent (dodecanol ester), 26% of polyacrylic acid emulsion (RS-2788), 0.2% of defoamer, 2% of fungicide, 7% of 7wt% lithium magnesium silicate solution, and the balance of water. The varnish comprises the following raw materials in mass percentage: 33% of polyacrylic acid emulsion, 1.3% of film-forming auxiliary agent, 2% of suspending agent (HMS-401), 1% of fungicide, and the balance of water.

[0040] The bactericide used in the following examples of the present invention is BIT.

[0041] The preparation method of the reflective thermal insulation coating comprises the following steps:

[0042] 1) Weigh the base paint raw materials by mass, add a wetting agent, a dispersant, a thickener, an infrared reflective pigment, kaolin and a portion of a defoamer to water at a speed of 500 rpm, adjust the speed to 1500 rpm, add a multifunctional amine additive after 15 minutes, increase the speed to 2500 rpm, add propylene glycol, a film-forming aid, a polyacrylic acid emulsion and the remaining defoamer and a fungicide after 20 minutes, reduce the speed to 2000 rpm, add a 7wt% lithium magnesium silicate solution dropwise after 15 minutes, adjust the speed to 3000 rpm, and obtain a reflective thermal insulation coating base paint after 20 minutes;

[0043] 2) weighing the varnish raw materials by mass, adding the polyacrylic acid emulsion, the film-forming aid, the suspending agent, the bactericide and water at a rotation speed of 500 rpm, stirring, and obtaining a reflective thermal insulation coating varnish;

[0044] 3) The prepared reflective thermal insulation coating base paint is toned using an organic reflective pigment, then added to a lithium magnesium silicate solution for cutting and granulation, and then added with the prepared reflective thermal insulation coating varnish (continuous phase), and mixed evenly to obtain a reflective thermal insulation coating.

[0045] In the following embodiments of the present invention, the thickness of the bottom layer coating is 400 μm, and the thickness of the surface multi-colored coating is 200 μm.

[0046] The present invention also provides a method for preparing the reflective heat-insulating colorful coating, wherein the reflective heat-insulating colorful coating is composed of two coatings, namely, a barrier-type heat-insulating coating and a reflective heat-insulating coating, after being coated and dried; the barrier-type heat-insulating coating is used as a base coating with a thickness of 400 μm, and the reflective heat-insulating coating is used as a surface colorful coating with a thickness of 200 μm.

[0047] The present invention also provides an application of the reflective heat-insulating multi-colored paint as a building paint for temperate monsoon climate zones and temperate continental climate zones.

[0048] The following examples serve as further illustrations of the technical solutions of the present invention.

[0049] Example 1

[0050] 1. The formula of the barrier thermal insulation coating is listed in Table 1. Wherein X represents the variable of the thermal insulation filler, and the remaining amount after removing all raw materials is water based on 100wt%.

[0051] Table 1 Barrier insulation coating formula

[0052] raw material wt / % water margin Hydroxyethyl cellulose ether 0.3 Multifunctional amine additives 0.1 Wetting Agents 0.2 Dispersants 0.5 Defoaming agent 0.2 Rutile Titanium Dioxide 12 Calcium carbonate 23-X Thermal insulation filler X Kaolin 5 Polyacrylic acid emulsion 30 Film-forming aids 2.5 Leveling agent 0.5 Associative thickener 0.2 Fungicides 1

[0053] Preparation of barrier-type thermal insulation coating: At a rotation speed of 500 rpm, add hydroxyethyl cellulose ether, a wetting agent, a dispersant and 50 wt% (half of the total mass) of a defoamer to half the volume of water, disperse for 10 minutes, add a multifunctional amine additive, increase the speed to 2000 rpm, and after the viscosity of the system is uniform and unchanged, add rutile titanium dioxide, kaolin and calcium carbonate, increase the speed to 3000 rpm, and disperse for 20 minutes; adjust the speed to 1500 rpm, and then add polyacrylic acid emulsion, film-forming aid, thermal insulation filler, leveling agent, associative thickener, remaining defoamer and remaining water in turn, and disperse for another 20 minutes to obtain a barrier-type thermal insulation coating.

[0054] 2. The reflective thermal insulation coating comprises the following raw materials in percentage by weight: 50% of the reflective thermal insulation coating base paint, 20% of the 7wt% lithium magnesium silicate solution, and 30% of the reflective thermal insulation coating varnish (continuous phase), wherein the base paint formula is as listed in Table 2, and the varnish formula is as listed in Table 3. Wherein Y represents the variable of the infrared reflective pigment Altiris-800, and the sum of all raw materials is 100wt%.

[0055] Table 2 Basic paint formula

[0056] raw material wt / % water 56.7-Y Wetting Agents 0.2 Dispersants 0.2 Thickener 0.9 Infrared reflective pigments Y Kaolin 6 Multifunctional amine additives 0.2 Propylene glycol 0.6 Film-forming aids 1 Polyacrylic acid emulsion 26 Defoaming agent 0.2 Fungicides 2％ Granulating solution 7% lithium magnesium silicate 7

[0057] Table 3 Varnish formula

[0058] raw material wt / % water margin Suspension 2 Film-forming aids 1.3 Polyacrylic acid emulsion 33 Fungicides 1％

[0059] Preparation of reflective thermal insulation coating:

[0060] 1) Weigh the base paint raw materials by mass, add a wetting agent, a dispersant, a thickener, an infrared reflective pigment, kaolin and half the mass of a defoamer to water at a speed of 500 rpm, adjust the speed to 1500 rpm, add a multifunctional amine additive after 15 minutes, increase the speed to 2500 rpm, add propylene glycol, a film-forming aid, a polyacrylic acid emulsion and the remaining defoamer and a bactericide after 20 minutes, reduce the speed to 2000 rpm, add a 7wt% lithium magnesium silicate solution dropwise after 15 minutes, adjust the speed to 3000 rpm, and obtain a reflective thermal insulation coating base paint after 20 minutes;

[0061] 2) weighing the varnish raw materials by mass, adding the polyacrylic acid emulsion, the film-forming aid, the suspending agent, the bactericide and water at a rotation speed of 500 rpm, stirring, and obtaining a reflective thermal insulation coating varnish;

[0062] 3) The prepared reflective thermal insulation coating base paint is toned using an organic reflective pigment, then added to a lithium magnesium silicate solution for cutting and granulation, and then added with the prepared reflective thermal insulation coating varnish (continuous phase), and mixed evenly to obtain a reflective thermal insulation coating.

[0063] 3. Preparation of reflective heat-insulating colorful coating: first apply the bottom layer barrier heat-insulating coating with a thickness of 400 μm, and then apply the surface colorful reflective heat-insulating coating with a thickness of 200 μm.

[0064] Performance Test:

[0065] Insulation temperature difference: Referring to the standard JC / T1040-2020 "Heat-reflective insulation coatings for building exterior surfaces", a self-made insulation temperature difference test instrument was made. The test board and the reference black board were heated at the same time at an ambient temperature of 20°C for 15 minutes. The temperature under the board was taken 15 minutes after heating to compare the temperature difference.

[0066] Coating reflectivity: The coating was applied to a smooth aluminum plate with a size of 100 mm × 80 mm × 1.0 mm, and the coating thickness was controlled at 200 μm. The reflectivity was measured using a UV-visible-near infrared spectrophotometer. The calculation formulas for solar reflectivity (TSR) and near infrared reflectivity (NIR) are shown in Formula 1 and Formula 2.

[0067] TSR calculation formula:

[0068]

[0069] Where: ρ is the sunlight reflectance of the test board; ρ0(λ) is the spectral reflectance of the standard white board; ρ(λ) is the spectral reflectance of the test board; S λ is the solar spectrum irradiance; △λ is the wavelength interval, the unit is nanometer (nm).

[0070] NIR calculation formula:

[0071]

[0072] Where: NIR is the near-infrared reflectance of the test plate; ρ0(λ) is the spectral reflectance of the standard white plate; ρ(λ) is the spectral reflectance of the test plate; S λ is the solar spectrum irradiance; △λ is the wavelength interval, the unit is nanometer (nm).

[0073] Thermal conductivity: The reference standard is GB / T10297-2015 "Hot wire method for determination of thermal conductivity of non-metallic solid materials". A laser thermal conductivity meter is used to test the thermal conductivity of the coating. A square sample with a specification of 10mm×10mm×1.0mm is prepared. The sample is irradiated for a short time with a high-intensity laser pulse to measure the thermal conductivity of the sample.

[0074] Basic performance: Refer to the standard GB / T25261-2018 "Reflective Thermal Insulation Coatings for Buildings" to test the basic performance of coating state, low temperature stability, construction performance, drying time, coating appearance, water resistance, alkali resistance, temperature change resistance, etc.

[0075] Test and results

[0076] 1. Research on barrier thermal insulation coatings

[0077] 1. The specific ratio of the thermal insulation filler in the barrier type thermal insulation coating of Example 1 is set according to Table 4. SiO2 aerogel is initially used as the main thermal insulation filler, and its addition amount in the barrier type thermal insulation coating is initially set to 3.0wt%. The effect of different microbead ratios on the overall thermal insulation performance of the coating is studied.

[0078] Table 4 Test results of thermal insulation filler addition amount (wt%) and thermal insulation temperature difference in each group

[0079] Thermal insulation filler <![CDATA[SiO2 aerogel]]> Hollow ceramic microspheres Hollow glass beads Insulation temperature difference (℃) Blank group* 0 0 0 55.9 Group 1 3 3.5 3.5 62.1 Group 2 3 4.2 2.8 62.9 Group 3 3 4.9 2.1 64.3 Group 4 3 5.6 1.4 65.3 Group 5 3 6.3 0.7 65 Group 6 3 7 0 62.5

[0080] *The blank group represents ordinary coating without added thermal insulation filler.

[0081] It can be seen from Table 4 that with the change in the ratio between hollow ceramic microspheres and hollow glass microspheres, the thermal insulation performance first increases and then decreases, and the best ratio between hollow ceramic microspheres and hollow glass microspheres is 4:1 (ie, group 4).

[0082] 2. According to Table 5, the specific ratio of the thermal insulation filler in the barrier-type thermal insulation coating in Example 1 is set, the mass ratio of hollow ceramic microspheres to hollow glass microspheres is set to 4:1, the addition amount of SiO2 aerogel is adjusted, and the effect of the ratio of SiO2 aerogel to composite microspheres on the overall thermal insulation performance of the coating is studied.

[0083] Table 5 Test results of thermal insulation filler addition amount (wt%) and thermal insulation temperature difference in each group

[0084] Thermal insulation filler <![CDATA[SiO2 aerogel]]> Hollow ceramic microspheres Hollow glass beads Insulation temperature difference (℃) Blank Group 0 0 0 56.4 Group 1 1 7.2 1.8 61.6 Group 2 2 6.4 1.6 63.4 Group 3 3 5.6 1.4 65.4 Group 4 4 4.8 1.2 66.5 Group 5 5 4 1 66.3 Group 6 6 3.2 0.8 64.8

[0085] As can be seen from Table 5, as the proportion of SiO2 aerogel thermal insulation filler increases, the thermal insulation performance shows a trend of first increasing, then leveling off, and then decreasing. The optimal proportion of SiO2 aerogel is 4.0%. The final ratio of the composite thermal insulation filler is SiO2 aerogel: hollow ceramic microspheres: hollow glass microspheres with a mass ratio of 1:1.2:0.3 (i.e., group 4). The temperature difference between the coating with the thermal insulation filler and the ordinary coating can reach 10.1°C.

[0086] 3. Based on the thermal insulation filler prepared in the mass ratio of SiO2 aerogel: hollow ceramic microspheres: hollow glass microspheres of 1:1.2:0.3, the addition amount of the thermal insulation filler in Example 1 was controlled to be 0wt%, 4wt%, 6wt%, 8wt%, 10wt%, and 12wt%, respectively, and the test temperature difference is shown in Table 5.

[0087] Table 6 Insulation temperature difference corresponding to the amount of insulation filler added

[0088]

[0089] It can be seen from Table 6 that the addition of thermal insulation filler will increase the thermal insulation performance of the coating. When the addition amount reaches 8%, the temperature difference rises slowly and reaches the maximum temperature difference near 10%. When the temperature difference is 12%, it is slightly lower than 10%, indicating that the addition amount of thermal insulation filler is too large at this time. Therefore, the most suitable addition amount is determined to be 10%.

[0090] 2. Research on reflective heat-insulating multi-color coatings

[0091] 1. In order to make the reflection of the coating be Fresnel-type reflection and play an effective heat insulation role, this experiment selected the infrared reflective pigment Altiris-800 with a particle size of 800nm ​​as the reflective filler in the reflective heat insulation coating.

[0092] The addition amounts of the infrared reflective pigment Altiris-800 in the reflective thermal insulation coating of Example 1 are set to be 0wt%, 2wt%, 4wt%, 6wt%, 8wt%, and 10wt%, respectively. The UV-visible-near infrared light reflection spectrum of the coating is as follows: Figure 1 The TSR and NIR of the coating at each addition amount were calculated according to the formula as shown in Table 7.

[0093] Table 7 TSR, NIR of coatings with different addition amounts of infrared reflective pigment Altiris-800

[0094] Altiris-800 (wt%) TSR(%) NIR(%) 0 50 50.8 2 72.7 75.4 4 75 78.3 6 80.6 84.1 8 82.1 85.8 10 82.4 86.1

[0095] As can be seen from Table 7, with the increase of the amount of infrared reflective pigment Altiris-800, TSR continues to increase, but with the continued increase in dosage, TSR tends to be flat; NIR has been showing an increasing trend, but the increase trend is not obvious in the end. Therefore, the most suitable addition amount is determined to be 8%.

[0096] 2. Selection of organic reflective pigments

[0097] The three most commonly used colors of red, yellow and black in exterior wall coatings are the main research objects. The present invention respectively studies the effects of common iron-based pigments, inorganic composite metal oxide pigments and organic reflective pigments on TSR and NIR of coatings, and selects the pigment with the best reflective effect to prepare colorful coatings. The amount of pigment added in the experiment is 5% of the mass of the reflective thermal insulation coating.

[0098] The solar reflectivity of the coating with different red pigments added is as follows Figure 2 As shown, the TSR and NIR values ​​of different coatings are calculated according to the formula and are listed in Table 8.

[0099] Table 8 TSR and NIR of coatings with different red pigments

[0100] pigment TSR(%) NIR(%) none 82.1 85.8 Perylene Red 52.2 76.9 Ferrosilicon Red 46.8 69.8 Iron Red 43.4 66.4

[0101] TSR and NIR of coatings with different yellow pigments added Figure 3 As shown, the TSR and NIR values ​​of different coatings are calculated according to the formula and are listed in Table 9.

[0102] Table 9 TSR and NIR of coatings with different yellow pigments

[0103] pigment TSR(%) NIR(%) none 82.1 85.8 Chloroisoindolinone Yellow 68 85.2 Titanium Chrome Yellow 64 84.1 Iron yellow 48.8 64.6

[0104] TSR and NIR of coatings with different black pigments added Figure 4 As shown, the TSR and NIR values ​​of different coatings are calculated according to the formula and are listed in Table 10.

[0105] Table 10 TSR and NIR of coatings with different black pigments

[0106] pigment TSR(%) NIR(%) none 82.1 85.8 Perylene Black 47.2 76.7 Iron Chrome Black 27 43.8 Iron Black 7.8 6.9

[0107] Depend on Figure 2 , Figure 3 as well as Figure 4 It can be seen that compared with composite inorganic metal oxide reflective pigments and ordinary iron-based pigments, organic reflective pigments do not produce new absorption peaks in the near-infrared region, and have the highest TSR and NIR among red, yellow and black pigments, which is closely related to the molecular stability and symmetry of organic reflective pigments and the zero molecular dipole moment. Therefore, organic reflective pigments can be selected as infrared reflective pigments for the preparation of water-based multi-color coatings.

[0108] Example 2

[0109] Double-layer coating energy saving simulation

[0110] In order to better select and compare the applicable areas of reflective heat-insulating multi-color coatings, the present invention selects three coatings, ordinary light-colored coatings, reflective heat-insulating multi-color coatings, and reflective heat-insulating white coatings, to perform energy consumption simulation analysis. The reflective heat-insulating multi-color coating used is a product prepared by the optimal technical solution obtained from the above test.

[0111] Right now:

[0112] The barrier-type thermal insulation coating includes the following components in percentage by mass: 0.3% hydroxyethyl cellulose ether, 0.1% multifunctional amine additive, 0.2% wetting agent, 0.5% dispersant, 0.2% defoaming agent, 12% rutile titanium dioxide, 13% calcium carbonate, 10% thermal insulation filler, 5% kaolin, 30% polyacrylic acid emulsion, 2.5% film-forming additive, 0.5% leveling agent, 0.2% associative thickener, and the balance water.

[0113] Preparation of barrier-type thermal insulation coating: At a rotation speed of 500 rpm, add hydroxyethyl cellulose ether, a wetting agent, a dispersant and 50 wt% (half of the total mass) of a defoamer to half the volume of water, disperse for 10 minutes, add a multifunctional amine additive, increase the speed to 2000 rpm, and after the viscosity of the system is uniform and unchanged, add rutile titanium dioxide, kaolin and calcium carbonate, increase the speed to 3000 rpm, and disperse for 20 minutes; adjust the speed to 1500 rpm, and then add polyacrylic acid emulsion, film-forming aid, thermal insulation filler, leveling agent, associative thickener, remaining defoamer and remaining water in turn, and disperse for another 20 minutes to obtain a barrier-type thermal insulation coating.

[0114] The reflective heat-insulating coating comprises the following raw materials in percentage by mass: 50% of reflective heat-insulating coating base paint, 20% of 7wt% lithium magnesium silicate solution, and 30% of reflective heat-insulating coating varnish.

[0115] The base paint includes the following components in percentage by mass: 0.2% wetting agent, 0.2% dispersant, 0.9% thickener, 8% infrared reflective pigment, 6% kaolin, 0.2% multifunctional amine additive, 0.6% propylene glycol, 1% film-forming additive, 26% polyacrylic acid emulsion, 0.2% defoamer, 2% bactericide, 7% 7wt% lithium magnesium silicate solution and balance water.

[0116] The varnish comprises the following raw materials in percentage by mass: 33% of polyacrylic acid emulsion, 1.3% of film-forming aid, 2% of suspending agent, 1% of bactericide and the balance of water.

[0117] The preparation method of the reflective thermal insulation coating comprises the following steps:

[0118] 1) Weigh the base paint raw materials by mass, add a wetting agent, a dispersant, a thickener, an infrared reflective pigment, kaolin and half the mass of a defoamer to water at a speed of 500 rpm, adjust the speed to 1500 rpm, add a multifunctional amine additive after 15 minutes, increase the speed to 2500 rpm, add propylene glycol, a film-forming aid, a polyacrylic acid emulsion and the remaining defoamer and a bactericide after 20 minutes, reduce the speed to 2000 rpm, add a 7wt% lithium magnesium silicate solution dropwise after 15 minutes, adjust the speed to 3000 rpm, and obtain a reflective thermal insulation coating base paint after 20 minutes;

[0119] 2) weighing the varnish raw materials by mass, adding the polyacrylic acid emulsion, the film-forming aid, the suspending agent, the bactericide and water at a rotation speed of 500 rpm, stirring, and obtaining a reflective thermal insulation coating varnish;

[0120] 3) Using organic reflective pigments (perylene red, perylene black, and chloroisoindolinone yellow as pigments in a mass ratio of 1:1:1) to adjust the color of the prepared reflective thermal insulation coating base paint (the amount of organic reflective pigment added is 5% of the mass of the reflective thermal insulation coating base paint), then adding it to a lithium magnesium silicate solution for cutting and granulation, and then adding the prepared reflective thermal insulation coating varnish, mixing evenly to obtain a reflective thermal insulation coating.

[0121] Preparation of reflective heat-insulating colorful coating: first apply the bottom layer barrier heat-insulating coating with a thickness of 400 μm, and then apply the top layer reflective heat-insulating coating with a thickness of 200 μm.

[0122] Use SketchUp software to draw a typical building model, its appearance is as follows Figure 5 shown.

[0123] The building has five floors, each with a height of 3.2m and a window-to-wall ratio of 25%. Each floor is designed with two houses, each with three bedrooms and one living room, and a living area of ​​162m 2 According to the building design standards, the heat transfer coefficients (W / m 2 ·K) are 1.43, 0.56 and 1.00 respectively.

[0124] Ordinary coating, reflective heat-insulating colorful coating and reflective heat-insulating white coating are used as the exterior wall coating of the building, and the coating is the only variable in the building energy consumption simulation. The cities where the building is located are set as Beijing, Hangzhou, Haikou, Urumqi and Xining, representing the typical temperate monsoon, subtropical monsoon, tropical monsoon, temperate continental and plateau mountain climate zones in my country.

[0125] OpenStudio software was used to simulate and analyze the energy consumption of the five locations, and the annual energy consumption of the buildings was obtained as shown in Table 11.

[0126] Table 11 Building energy consumption under different coatings (KWh / m 2 )

[0127]

[0128]

[0129] As can be seen from Table 11, reflective heat-insulating coatings effectively reduce the energy consumption of buildings compared with ordinary coatings, and the energy-saving effects vary significantly in different regions. According to the average carbon dioxide emission factor of the power grid, it is 0.7934kgCO2 / KWh. The reduction in total energy consumption and total carbon emissions of using reflective heat-insulating colorful coatings and reflective heat-insulating white coatings compared with ordinary coatings in various regions is calculated as shown in Table 12 below.

[0130] Table 12 Energy consumption and carbon emission reduction of buildings under different reflective thermal insulation coatings (KWh / m 2 )

[0131]

[0132] From the results of energy consumption and carbon emission reduction, it can be seen that reflective heat insulation colorful coatings can effectively reduce energy consumption and carbon emissions in various climate zones, but the reduction in Xining is relatively small (negative values ​​indicate that reflective heat insulation white coatings are not suitable for use in places like Xining, because although heat insulation reduces energy consumption in summer, buildings in the north need more insulation in winter. Reflective heat insulation coatings block solar heat energy outdoors, resulting in more energy consumption for indoor heating, so negative values ​​appear). In Hangzhou and Haikou, the energy consumption and carbon emission reductions of reflective heat insulation white coatings are lower. In Beijing and Urumqi, energy consumption and carbon emissions can be effectively reduced, and the difference with reflective heat insulation white coatings is not much. Therefore, reflective heat insulation colorful coatings are most suitable for use in temperate monsoon climate zones and temperate continental climate zones, which can reduce about 2-4KWh / m 2 Energy consumption and 1-3kg / m 2 of carbon emissions.

[0133] IV. Conclusion

[0134] The present invention takes water-based composite heat-insulating multi-color coating as the research object, and uses the bottom barrier heat-insulating coating and the surface reflective heat-insulating multi-color coating to work together, so that the coating has both heat insulation and decorative properties. By screening and compounding the barrier heat-insulating filler, a heat-insulating filler with a composition ratio of SiO2 aerogel: hollow ceramic microspheres: hollow glass microspheres with a mass ratio of 1:1.2:0.3 is obtained. The optimal addition amount of the heat-insulating filler in the ordinary heat-insulating coating is 10wt%. Compared with the ordinary coating without adding the heat-insulating filler, the heat-insulating temperature difference of the heat-insulating coating is increased by 11.7℃, and other basic performance requirements of the coating are met. In the study of the surface reflective multi-color coating, the addition amount of Altiris-800 was tested, and the optimal addition amount of Altiris-800 was obtained to be 8wt%. In addition, by comparison, it was found that the organic series pigments have the relatively best solar reflectance and near-infrared reflectance, which can be used in the surface multi-color coating pigments to perform double-layer composite heat insulation with the bottom heat-insulating coating. The energy-saving simulation analysis of double-layer reflective heat-insulating colorful coatings in different regions shows that it can reduce building energy consumption and carbon emissions in various climate zones, especially in temperate continental climate zones and temperate monsoon climate zones, and can reduce about 2-4KWh / m per year. 2 Energy consumption and 1-3kg / m 2 of carbon emissions.

[0135] Comparative Example 1

[0136] The same as Example 2, except that the preparation method of the barrier type thermal insulation coating is: weigh the thickener, multifunctional amine auxiliary agent, wetting agent, dispersant, defoaming agent, rutile titanium dioxide, calcium carbonate, thermal insulation filler, kaolin, polyacrylic acid emulsion, film-forming auxiliary agent, leveling agent, associative thickener and water by mass and mix them, stir at 500 rpm for 20 minutes to obtain the barrier type thermal insulation coating.

[0137] The thermal insulation temperature difference of the barrier thermal insulation coating prepared by this comparative example is 64.8°C, and the energy consumption of the reflective thermal insulation colorful coating obtained in Beijing is 2.51KWh / m 2 , carbon emissions are 1.99KWh / m 2 .

[0138] Comparative Example 2

[0139] The same as Example 2, except that the preparation method of the base paint in the reflective thermal insulation coating is as follows: weigh the wetting agent, dispersant, thickener, reflective thermal insulation pigment, kaolin, defoamer, multifunctional amine additive, propylene glycol, film-forming aid, polyacrylic acid emulsion, bactericide, 7wt% lithium magnesium silicate solution and water by mass, stir, and obtain the reflective thermal insulation coating base paint after 20 minutes.

[0140] The coating prepared by this comparative example has a TSR of 80.2% and a NIR of 83.9%. The energy consumption of the obtained reflective heat-insulating multi-colored coating in Beijing is 2.53 KWh / m 2 , carbon emissions are 2.03KWh / m 2 .

[0141] Comparative Example 3

[0142] The same as Example 2, except that the amount of the organic reflective pigment chloroisoindolinone yellow added is 3% of the mass of the reflective thermal insulation coating.

[0143] The TSR of the reflective heat-insulating multi-color coating prepared by this comparative example is 65%, and the NIR is 84.1%. The energy consumption of the reflective heat-insulating multi-color coating in the background is 2.47 KWh / m 2 , carbon emissions are 1.97KWh / m 2 .

[0144] The above are only preferred specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A reflective heat-insulating colorful paint, It is characterized in that The reflective heat-insulating multi-color coating has a barrier-type heat-insulating coating as a bottom coating, a reflective heat-insulating coating as a surface multi-color coating, and an organic reflective pigment as a multi-color pigment; The thermal insulation filler in the barrier type thermal insulation coating is SiO 2 Aerogel, hollow ceramic microspheres and hollow glass microspheres are compounded in a mass ratio of 1:1.2:0.3; The reflective filler in the reflective thermal insulation coating is a mixture of one or more infrared reflective pigments such as Altiris-800, IR1000 and PFR-404; The barrier-type heat-insulating coating comprises the following raw materials in percentage by mass: 0.3% hydroxyethyl cellulose ether, 0.1% multifunctional amine auxiliary agent, 0.2% wetting agent, 0.5% dispersant, 0.2% defoamer, 5-25% rutile titanium dioxide, 13% calcium carbonate, 5-20% heat-insulating filler, 5% kaolin, 30% polyacrylic acid emulsion, 2.5% film-forming auxiliary agent, 0.5% leveling agent, 1% bactericide, 0.2% associative thickener, and the balance water; The reflective heat-insulating coating comprises the following raw materials in percentage by weight: 50% of a reflective heat-insulating coating base paint, 20% of a 7wt% lithium magnesium silicate solution, and 30% of a reflective heat-insulating coating varnish; The base paint comprises the following raw materials in percentage by mass: 0.2% wetting agent, 0.2% dispersant, 0.9% thickener, 2-15% infrared reflective pigment, 6% kaolin, 0.2% multifunctional amine auxiliary, 0.6% propylene glycol, 1% film-forming auxiliary, 26% polyacrylic acid emulsion, 0.2% defoamer, 2% bactericide, 7% 7wt% lithium magnesium silicate solution and the balance water; The varnish comprises the following raw materials in percentage by mass: 33% polyacrylic acid emulsion, 1.3% film-forming aid, 2% suspending agent, 1% bactericide and the balance water.

2. The reflective heat-insulating colorful paint according to claim 1, It is characterized in that The preparation method of the barrier-type thermal insulation coating comprises the following steps: weighing raw materials according to mass ratio, adding hydroxyethyl cellulose ether, a wetting agent, a dispersant and a part of defoaming agent to a part of water at a rotation speed of 500 rpm, adding a multifunctional amine auxiliary agent after dispersing for 10 minutes, increasing the rotation speed to 2000 rpm, adding rutile titanium dioxide, kaolin and calcium carbonate after the viscosity of the system is uniform and remains unchanged, increasing the rotation speed to 3000 rpm, and dispersing for 20 minutes; adjusting the rotation speed to 1500 rpm, and then adding polyacrylic acid emulsion, film-forming auxiliary agent, thermal insulation filler, leveling agent, associative thickener, remaining defoaming agent and remaining water in sequence, and dispersing for another 20 minutes to obtain the barrier-type thermal insulation coating.

3. The reflective heat-insulating multi-colored paint according to claim 1, It is characterized in that The preparation method of the reflective thermal insulation coating comprises the following steps: 1) Weigh the base paint raw materials by mass, add a wetting agent, a dispersant, a thickener, an infrared reflective pigment, kaolin and a portion of a defoamer to water at a speed of 500 rpm, adjust the speed to 1500 rpm, add a multifunctional amine additive after 15 minutes, increase the speed to 2500 rpm, add propylene glycol, a film-forming aid, a polyacrylic acid emulsion and the remaining defoamer and a fungicide after 20 minutes, reduce the speed to 2000 rpm, add a 7wt% lithium magnesium silicate solution dropwise after 15 minutes, adjust the speed to 3000 rpm, and obtain a reflective thermal insulation coating base paint after 20 minutes; 2) weighing the varnish raw materials by mass, adding the polyacrylic acid emulsion, the film-forming aid, the suspending agent, the bactericide and water at a rotation speed of 500 rpm, stirring, and obtaining a reflective thermal insulation coating varnish; 3) The prepared reflective thermal insulation coating base paint is toned using an organic reflective pigment, then added into a lithium magnesium silicate solution for cutting and granulation, and then added into the prepared reflective thermal insulation coating varnish, and mixed evenly to obtain a reflective thermal insulation coating.

4. The reflective heat-insulating colorful paint according to claim 1, It is characterized in that The thickness of the bottom coating is 400 μm, and the thickness of the surface multi-colored coating is 200 μm.

5. A method for preparing the reflective heat-insulating multi-color coating according to any one of claims 1 to 4, It is characterized in that The reflective heat-insulating colorful coating is composed of two coatings, namely, a barrier-type heat-insulating coating and a reflective heat-insulating coating, after the coating is applied and dried; the barrier-type heat-insulating coating is used as a bottom coating with a thickness of 400 μm, and the reflective heat-insulating coating is used as a surface colorful coating with a thickness of 200 μm.

6. Use of the reflective heat-insulating multi-color paint as claimed in any one of claims 1 to 4 as architectural paint for temperate monsoon climate zones and temperate continental climate zones.

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