Heat insulation coating and preparation method thereof

Abstract

The invention belongs to the technical field of coating preparation, and particularly relates to a heat insulation coating and a preparation method thereof.The heat insulation coating is prepared from, by weight, 40%-41% of BaSO4 / ZrO2 powder, 0.2%-0.4% of wetting agent, 0.2%-0.4% of flatting agent, 15%-16% of pure acrylic emulsion or styrene-acrylic emulsion, 0.2%-0.4% of water-based non-silicon defoaming agent, 0.6%-0.8% of 2, 2, 4-trimethyl-1, 3-pentanediol monoisobutyrate and 41%-43% of water.The BaSO4 powder and the ZrO2 powder are mixed and calcined, and the heat insulation coating is obtained; compared with a mode of directly adding BaSO4 and ZrO2 powder, the BaSO4 / ZrO2 powder disclosed by the invention has the advantages that the reflection ratio to light is obviously improved, and the heat insulation effect is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of coating preparation, and in particular relates to a thermal insulation coating and a preparation method thereof. Background Art

[0002] Thermal insulation coating is a coating with low thermal conductivity, which is mainly used to isolate heat conduction. From the principle point of view, it can be divided into two types: 1. Isolation conduction type: The thermal conductivity is extremely low, which almost isolates the heat conduction and isolates the temperature difference environment.

[0003] 2. Reflective thermal light type: effectively reflects infrared rays and thermal visible light (the main part of heat generated by sunlight), making the surface of the material water-insulating paint, sun-proof and thermal insulation paint, etc.

[0004] Insulation conductive coatings are a type of coating that achieves heat insulation through the high thermal resistance of the coating itself. They are thick film coatings. During the coating construction, the coating is applied to a certain thickness, generally 5-20mm. After being fully dried and cured, the coating has a certain ability to slow down the heat flow transfer because the thermal conductivity of the material after drying and forming a film is very small.

[0005] Reflective heat-reflective paint, also known as solar heat-reflective paint, is made by adding ultra-fine pore materials, hollow glass or ceramic microbeads to the paint, and by selecting appropriate resins, metals, metal oxides, fillers and production processes to produce a high-reflectivity coating that reflects sunlight to achieve the purpose of heat insulation. Its heat insulation principle is mainly due to its high heat reflectivity, which effectively reduces radiation heat transfer and convection heat transfer. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide a thermal insulation coating and a preparation method thereof to improve the thermal insulation effect.

[0007] An embodiment of the present invention provides a thermal insulation coating, comprising the following components in percentage by weight: 40-41% BaSO4 / ZrO2 powder, 0.2-0.4% wetting agent, 0.2-0.4% leveling agent, 15-16% pure acrylic emulsion or styrene acrylic emulsion, 0.2-0.4% water-based non-silicon defoaming agent, 0.6-0.8% dodecanol ester, and 41-43% water.

[0008] Preferably, the composition includes the following components in percentage by weight: 41% BaSO4 / ZrO2 powder, 0.3% wetting agent, 0.3% leveling agent, 15% pure acrylic emulsion or styrene acrylic emulsion, 0.4% water-based non-silicon defoaming agent, 0.7% dodecyl alcohol ester, and 42.3% water.

[0009] Preferably, the BaSO4 / ZrO2 powder is a mixture of BaSO4 and ZrO2, and the weight ratio of BaSO4 to ZrO2 is 9:1.

[0010] Preferably, the preparation method of the BaSO4 / ZrO2 powder is to mix BaSO4 powder and ZrO2 powder, add them into water, stir, filter, dry, grind, and then calcine and ball mill to obtain BaSO4 / ZrO2 powder.

[0011] Preferably, the calcination temperature is 380-400°C.

[0012] The embodiment of the present invention provides a method for preparing the thermal insulation coating, comprising: evenly mixing BaSO4 / ZrO2 powder, water and a wetting agent; then adding a pure acrylic emulsion or a styrene acrylic emulsion and mixing evenly; then adding dodecyl alcohol ester, a leveling agent and a water-based non-silicon defoaming agent, mixing evenly, and degassing to obtain a thermal insulation coating; brushing the thermal insulation coating on a substrate, drying and then baking to obtain a thermal insulation coating.

[0013] Preferably, the uniform mixing method is carried out by ultrasonic oscillation.

[0014] Preferably, the substrate is a titanium plate.

[0015] Preferably, drying is performed at room temperature.

[0016] Preferably, the drying is carried out at 60-65°C.

[0017] The beneficial effect of the present invention is that the present invention obtains BaSO4 / ZrO2 powder by mixing and calcining BaSO4 and ZrO2 powder. Compared with the method of directly adding BaSO4 and ZrO2 powder, the reflectance of light is significantly improved, and the thermal insulation effect is improved. The solar reflectance, near-infrared reflectance and hemispherical emissivity of the obtained thermal insulation coating are 0.829, 0.775 and 0.93 respectively, and the thermal insulation temperature difference reaches 13.21°C, which is 4.29°C higher than that of the thermal insulation coating obtained by the conventional method. It shows that the BaSO4 / ZrO2 thermal insulation coating obtained by this method has good thermal insulation and cooling effect. DETAILED DESCRIPTION

[0018] Example 1 A method for preparing a thermal insulation coating comprises the following steps: 1. Preparation of BaSO4 / ZrO2 powder Weigh a certain mass of BaSO4 powder and ZrO2 powder into a beaker (the weight ratio of BaSO4 and ZrO2 is 9:1), add a certain volume of deionized water and stir for 65 minutes (speed is 850r / min), filter, dry and grind, calcine the powder at 400℃ for 4 hours, ball mill the calcined powder for 60 minutes to obtain BaSO4 / ZrO2 powder.

[0019] 2. Preparation of BaSO4 / ZrO2 thermal insulation coating A certain mass of BaSO4 / ZrO2 powder was weighed into a beaker, and a certain volume of deionized water and a certain mass of wetting agent were added, stirred evenly, and ultrasonically oscillated for 10 min to disperse evenly; a certain mass of pure acrylic emulsion was added, ultrasonically oscillated for 5 min, and then a certain mass of dodecyl alcohol ester, a certain mass of leveling agent and a certain mass of defoaming agent were added, and ultrasonically oscillated for 5 min, and degassed to obtain a thermal insulation coating; the thermal insulation coating was brushed on a titanium plate, dried at room temperature, and then placed in an oven (65°C) for curing for 4 days to obtain a BaSO4 / ZrO2 thermal insulation coating with a coating thickness of 300 μm.

[0020] The composition of each raw material is shown in Table 1.

[0021] Table 1 Mass ratio of each raw material

[0022] The performance of the thermal insulation coating obtained in Example 1 was measured. The solar reflectance, near-infrared reflectance and hemispherical emissivity of the thermal insulation coating were 0.829, 0.775 and 0.93 respectively. The thermal insulation temperature difference reached 13.21°C, which was 4.29°C higher than that of the thermal insulation coating obtained by the conventional method. The BaSO4 / ZrO2 thermal insulation coating prepared by this method has good thermal insulation and cooling effects.

[0023] Comparative Example 1 A method for preparing a thermal insulation coating comprises the following steps: Weigh a certain mass of BaSO4 and ZrO2 powders into a beaker, add a certain volume of deionized water and a certain mass of wetting agent, stir evenly, and ultrasonically oscillate for 10 min to disperse evenly; add a certain mass of pure acrylic emulsion, ultrasonically oscillate for 5 min, then add a certain mass of dodecyl alcohol ester, a certain mass of leveling agent and a certain mass of defoaming agent, ultrasonically oscillate for 5 min, deaerate, and obtain a thermal insulation coating; apply the thermal insulation coating on a titanium plate, dry it at room temperature, and then put it in an oven (65°C) for curing for 4 days to obtain a BaSO4 / ZrO2 thermal insulation coating.

[0024] The composition of each raw material is shown in Table 2.

[0025] Table 2 Mass ratio of each raw material

[0026] The performance of the thermal insulation coating obtained in Comparative Example 1 was measured, and the solar reflectance, near-infrared reflectance and hemispherical emissivity of the thermal insulation coating were 0.761, 0.732 and 0.66, respectively, and the thermal insulation temperature difference was 10.82°C.

[0027] A person skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of protection of the present application is limited to these examples. In line with the concept of the present application, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of different aspects of one or more embodiments of the present application as described above, which are not provided in detail for the sake of simplicity.

[0028] One or more embodiments of the present application are intended to cover all such substitutions, modifications and variations that fall within the broad scope of the present application. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of one or more embodiments of the present application should be included in the protection scope of the present application.

Claims

1. A thermal insulation coating, characterized in that: The invention comprises the following components in percentage by weight: 40-41% of BaSO4 / ZrO2 powder, 0.2-0.4% of wetting agent, 0.2-0.4% of leveling agent, 15-16% of pure acrylic emulsion or styrene acrylic emulsion, 0.2-0.4% of water-based non-silicon defoaming agent, 0.6-0.8% of dodecyl alcohol ester and 41-43% of water.

2. The thermal insulation coating according to claim 1, characterized in that: The invention comprises the following components in percentage by weight: 41% of BaSO4 / ZrO2 powder, 0.3% of wetting agent, 0.3% of leveling agent, 15% of pure acrylic emulsion or styrene acrylic emulsion, 0.4% of water-based non-silicone defoaming agent, 0.7% of dodecyl alcohol ester and 42.3% of water.

3. The thermal insulation coating according to claim 1 or 2, characterized in that: The BaSO4 / ZrO2 powder is a mixture of BaSO4 and ZrO2, and the weight ratio of BaSO4 to ZrO2 is 9:

1.

4. The thermal insulation coating according to claim 3, characterized in that: The preparation method of the BaSO4 / ZrO2 powder is as follows: BaSO4 powder and ZrO2 powder are mixed, added into water, stirred, filtered, dried, ground, and then calcined and ball-milled to obtain BaSO4 / ZrO2 powder.

5. The thermal insulation coating according to claim 4, characterized in that: The calcination temperature is 380-400°C.

6. A method for preparing a thermal insulation coating according to any one of claims 1 to 5, characterized in that: Mix BaSO4 / ZrO2 powder, water and wetting agent evenly; then add pure acrylic emulsion or styrene acrylic emulsion and mix evenly; then add dodecyl alcohol ester, leveling agent and water-based non-silicon defoaming agent, mix evenly, degas, and obtain thermal insulation coating; apply the thermal insulation coating on the substrate by brushing, dry and then bake to obtain thermal insulation coating.

7. The preparation method according to claim 6, characterized in that: The method for uniform mixing is to use ultrasonic oscillation.

8. The preparation method according to claim 6, characterized in that: The substrate is a titanium plate.

9. The preparation method according to claim 6, characterized in that: Drying is carried out at room temperature.

10. The preparation method according to claim 6, characterized in that: The drying method is to carry out at 60-65°C.

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