Fly ash water-based heat insulation coating and preparation method thereof

Abstract

The invention discloses a fly ash water-based thermal insulation coating and a preparation method thereof, and belongs to the technical field of paints.The fly ash is selected to replace part of functional filler in the thermal insulation coating, and the prepared fly ash water-based thermal insulation coating has the characteristics of thermal insulation and flame retardance; a preparation process of the fly ash water-based heat insulation coating comprises the following steps: fully and uniformly mixing the thickening agent, the fly ash, the mica powder and the heat insulation powder in the raw material components in percentage by mass to obtain a solid component; (2) fully and uniformly mixing the acrylate emulsion, the water-based additive and water in the raw material components according to the mass percent to obtain a liquid component; feeding the liquid component into a high-speed dispersion machine for stirring, setting the rotating speed to be 1200r / min, slowly pouring the solid component while stirring, and fully mixing the liquid component and the solid component to obtain a solid-liquid mixture; the obtained solid-liquid mixture is put into a low-speed dispersion machine with the rotating speed of 150 r / min for low-speed stirring, and after bubbles are gradually eliminated, the fly ash water-based heat insulation coating is obtained.

Description

Technical Field

[0001] The invention relates to the technical field of coatings, and in particular to a fly ash water-based heat-insulating coating and a preparation method thereof. Background Art

[0002] Fly ash is fine ash collected from the flue gas after coal combustion, and its main components are: SiO2, Al2O3, Fe2O3, CaO, etc. According to statistics, my country's fly ash emissions in 2022 will be about 650 million tons, and the comprehensive utilization will be about 507 million tons, with a comprehensive utilization rate of 78%. A large amount of fly ash is not utilized, becoming one of the largest industrial waste residues in my country. If a large amount of fly ash is not treated, it will generate dust and pollute the atmosphere. If it is discharged into the water system, it will cause river siltation, and the toxic chemicals in it will also cause harm to humans and organisms.

[0003] There are many ways to utilize fly ash, but currently the utilization of fly ash in my country is mainly used in cement, concrete and building materials; other utilization methods such as deep processing products and high added value utilization are relatively rare. High added value utilization technology is an important means to expand the comprehensive utilization of fly ash, improve the comprehensive utilization rate of fly ash and the economic benefits of comprehensive utilization.

[0004] At the same time, fly ash has the characteristics of large surface area, high porosity and contains about 5-10% hollow ceramic microspheres. Therefore, fly ash has great application prospects in thermal insulation coatings as a cheap material. Summary of the invention

[0005] Based on this, it is necessary to address the deficiencies in the background technology. The purpose of the present invention is to provide a fly ash water-based thermal insulation coating and a preparation method thereof. The method uses fly ash to replace some functional fillers in the thermal insulation coating. The fly ash specifically refers to the fly ash of the power boiler of Huaneng Power Plant. The reason is that the content of hollow ceramic microbeads in the fly ash of the power boiler of Huaneng Power Plant is relatively high, reaching 5% to 10%. The fly ash water-based thermal insulation coating prepared by this method has the characteristics of heat insulation and flame retardancy.

[0006] The present invention is achieved through the following technical scheme: a fly ash water-based thermal insulation coating, which includes the following raw material components in percentage by mass: 20% to 25% fly ash, 4% to 10% mica powder, 5% to 10% thermal insulation powder, 25.0% to 35.0% acrylic emulsion, 10.0% to 15.0% water-based additive, 1.0% to 2.0% thickener, and the balance is water.

[0007] In order to better realize the fly ash water-based thermal insulation coating described in the present invention, the following setting method is particularly adopted: it includes the following raw material components in percentage by mass: 25% fly ash, 5% mica powder, 10% thermal insulation powder, 25.0% acrylic emulsion, 15.0% water-based additive, 1.0% thickener, and the balance is water.

[0008] In order to better realize the fly ash water-based thermal insulation coating described in the present invention, the following setting method is particularly adopted: the fly ash is the fly ash of the power boiler of Huaneng Power Plant containing not less than 5% hollow ceramic microbeads and an average particle size of about 36μm.

[0009] In order to better realize the fly ash water-based thermal insulation coating described in the present invention, the following setting method is particularly adopted: the acrylic emulsion is an emulsion formed by compounding pure acrylic emulsion, styrene acrylic emulsion, and silicone acrylic emulsion, wherein the compounding mass percentages between the components are: pure acrylic emulsion 30% to 40%, styrene acrylic emulsion 35% to 45%, and silicone acrylic emulsion 25% to 35%.

[0010] In order to better realize the fly ash water-based thermal insulation coating described in the present invention, the following setting method is particularly adopted: the acrylic emulsion is an emulsion formed by compounding pure acrylic emulsion, styrene acrylic emulsion, and silicone acrylic emulsion, wherein the compounding mass percentages between the components are: 30% pure acrylic emulsion, 40% styrene acrylic emulsion, and 30% silicone acrylic emulsion.

[0011] In order to better realize the fly ash water-based thermal insulation coating described in the present invention, the following setting method is particularly adopted: the water-based additives include dispersants, defoamers, film-forming additives, multifunctional additives and wetting agents, wherein the mass percentages of the components are: dispersant 30% to 45%, defoamer 10% to 20%, film-forming additive 20% to 30%, multifunctional additive 8% to 12% and wetting agent 8% to 12%.

[0012] In order to better realize the fly ash water-based thermal insulation coating described in the present invention, the following setting method is particularly adopted: the water-based additives include dispersant, defoamer, film-forming additive, multifunctional additive and wetting agent, wherein the mass percentages between the components are: dispersant 40%, defoamer 15%, film-forming additive 25%, multifunctional additive 10% and wetting agent 10%.

[0013] In order to better realize the fly ash water-based thermal insulation coating described in the present invention, the following setting is particularly adopted: the thickener is sulfonate type amphoteric hydrophobic associating polyacrylamide powder or other modified amphoteric hydrophobic associating polyacrylamide powder.

[0014] A method for preparing a fly ash water-based heat-insulating coating, which is used to prepare the fly ash water-based heat-insulating coating, comprises the following steps:

[0015] 1) fully and evenly mixing the thickener, fly ash, mica powder and thermal insulation powder in the raw material components according to mass percentage to obtain a solid component;

[0016] 2) fully mixing the acrylic emulsion, water-based additive and water in the raw material components according to mass percentage to obtain a liquid component;

[0017] 3) feeding the liquid component obtained in step 2) into a high-speed disperser for stirring at a speed of 1200 r / min, and slowly pouring the solid component obtained in step 1) into the mixture while stirring, and mixing the two components thoroughly to obtain a solid-liquid mixture;

[0018] 4) The solid-liquid mixture (viscous) obtained in step 3) is placed in a low-speed disperser with a rotation speed of 150 r / min and stirred at a low speed to obtain a fly ash water-based thermal insulation coating after the bubbles are gradually eliminated.

[0019] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0020] The fly ash water-based thermal insulation coating prepared by the present invention uses fly ash as a functional filler, which comes from power plant waste. The present invention can make high-value-added utilization of the fly ash, which not only expands the comprehensive utilization field of fly ash and improves the comprehensive utilization rate of fly ash, but also achieves certain economic benefits, reduces air pollution and protects the environment.

[0021] The inventive preparation method adopted by the present invention is simple, easy to operate, environmentally friendly, and suitable for industrial mass production. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is an image of fly ash from the power boiler of Huaneng Power Plant after being magnified 1000 times under a microscope.

[0023] Figure 2 This is an image of fly ash from a power boiler at a Sinopec plant, magnified 1000 times under a microscope. DETAILED DESCRIPTION

[0024] The present invention is further described in detail below in conjunction with examples, but the embodiments of the present invention are not limited thereto.

[0025] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the invention claimed for protection, but merely represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0026] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0027] Example 1

[0028] A fly ash water-based heat-insulating paint comprises the following raw material components in percentage by mass: 20% to 25% fly ash, 4% to 10% mica powder, 5% to 10% heat-insulating powder, 25.0% to 35.0% acrylic emulsion, 10.0% to 15.0% water-based additive, 1.0% to 2.0% thickener, and the balance is water.

[0029] Embodiment 2:

[0030] This embodiment is further optimized on the basis of the above embodiment, and the similarities with the above technical scheme are not repeated here. In order to better realize the fly ash water-based thermal insulation coating described in the present invention, the following setting method is particularly adopted: it includes the following raw material components in percentage by mass: 25% fly ash, 5% mica powder, 10% thermal insulation powder, 25.0% acrylic emulsion, 15.0% water-based additive, 1.0% thickener, and the balance is water.

[0031] Embodiment 3:

[0032] This embodiment is further optimized on the basis of any of the above embodiments. The similarities with the above technical solutions are not repeated here. In order to better realize the fly ash water-based heat insulation coating of the present invention, the following setting is particularly adopted: the fly ash is the fly ash of the power boiler of Huaneng Power Plant, which contains not less than 5% hollow ceramic microspheres and has an average particle size of about 36μm. The image of the fly ash of the power boiler of Huaneng Power Plant after magnification 1000 times under a microscope is as follows: Figure 1 The image of fly ash from a power boiler of a Sinopec plant after being magnified 1000 times under a microscope is shown in Figure 2 As shown, it is obvious that there are great differences in the content and average particle size of hollow ceramic microspheres between the two.

[0033] Embodiment 4:

[0034] This embodiment is further optimized on the basis of any of the above embodiments, and the similarities with the above technical solutions are not repeated here. In order to better realize the fly ash water-based thermal insulation coating described in the present invention, the following setting method is particularly adopted: the acrylic emulsion is an emulsion formed by compounding pure acrylic emulsion, styrene acrylic emulsion, and silicone acrylic emulsion, wherein the compounding mass percentages between the components are: pure acrylic emulsion 30% to 40%, styrene acrylic emulsion 35% to 45%, and silicone acrylic emulsion 25% to 35%.

[0035] Embodiment 5:

[0036] This embodiment is further optimized on the basis of any of the above embodiments, and the similarities with the above technical solutions are not repeated here. In order to better realize the fly ash water-based thermal insulation coating described in the present invention, the following setting method is particularly adopted: the acrylic emulsion is an emulsion formed by compounding pure acrylic emulsion, styrene acrylic emulsion, and silicone acrylic emulsion, wherein the compounding mass percentages between the components are: 30% pure acrylic emulsion, 40% styrene acrylic emulsion, and 30% silicone acrylic emulsion.

[0037] Embodiment 6:

[0038] This embodiment is further optimized on the basis of any of the above embodiments, and the similarities with the above technical solutions are not repeated here. In order to better realize the fly ash water-based thermal insulation coating described in the present invention, the following setting method is particularly adopted: the water-based additives include dispersants, defoamers, film-forming additives, multifunctional additives and wetting agents, wherein the mass percentages of the components are: dispersant 30% to 45%, defoamer 10% to 20%, film-forming additive 20% to 30%, multifunctional additive 8% to 12% and wetting agent 8% to 12%.

[0039] Embodiment 7:

[0040] This embodiment is further optimized on the basis of any of the above embodiments, and the similarities with the above technical solutions are not repeated here. In order to better realize the fly ash water-based thermal insulation coating described in the present invention, the following setting method is particularly adopted: the water-based additives include dispersants, defoamers, film-forming additives, multifunctional additives and wetting agents, wherein the mass percentages between the components are: 40% dispersant, 15% defoamer, 25% film-forming additive, 10% multifunctional additive and 10% wetting agent.

[0041] Embodiment 8:

[0042] This embodiment is further optimized on the basis of any of the above embodiments, and the similarities with the above technical solutions are not repeated here. In order to better realize the fly ash water-based thermal insulation coating described in the present invention, the following setting method is particularly adopted: the thickener is a sulfonate type amphoteric hydrophobically associating polyacrylamide powder or other modified amphoteric hydrophobically associating polyacrylamide powder.

[0043] Embodiment 9:

[0044] A method for preparing a fly ash water-based heat-insulating coating, which is used to prepare the fly ash water-based heat-insulating coating, comprises the following steps:

[0045] 1) fully and evenly mixing the thickener, fly ash, mica powder and thermal insulation powder in the raw material components according to mass percentage to obtain a solid component;

[0046] 2) fully mixing the acrylic emulsion, water-based additive and water in the raw material components according to mass percentage to obtain a liquid component;

[0047] 3) feeding the liquid component obtained in step 2) into a high-speed disperser for stirring at a speed of 1200 r / min, and slowly pouring the solid component obtained in step 1) into the mixture while stirring, and mixing the two components thoroughly to obtain a solid-liquid mixture;

[0048] 4) The solid-liquid mixture (viscous) obtained in step 3) is placed in a low-speed disperser with a rotation speed of 150 r / min and stirred at a low speed to obtain a fly ash water-based thermal insulation coating after the bubbles are gradually eliminated.

[0049] Embodiment 10:

[0050] A fly ash water-based heat-insulating paint comprises the following raw material components by mass percentage: 25% fly ash (including not less than 5% hollow ceramic microspheres and fly ash from power boilers of Huaneng Power Plant with an average particle size of about 36 μm), 5% heat-insulating powder, 10% mica powder, 25% acrylic emulsion, 15% water-based additive, 1.0% thickener and 19% water.

[0051] A method for preparing a fly ash water-based heat-insulating coating comprises the following steps:

[0052] 1) The thickener, fly ash, mica powder and thermal insulation powder are fully and evenly mixed to obtain a solid component, wherein the fly ash, thermal insulation powder and mica powder are functional fillers in the water-based thermal insulation coating, the fly ash is the fly ash of the power boiler of Huaneng Power Plant, the fly ash of the power boiler of Huaneng Power Plant has an average particle size of about 36 μm, and the hollow ceramic microspheres contained therein are not less than 5%; the thickener adopts sulfonate type amphoteric hydrophobically associating polyacrylamide powder or other modified amphoteric hydrophobically associating polyacrylamide powder.

[0053] 2) Fully and uniformly mix the acrylic emulsion, the water-based additive and water to obtain a liquid component; wherein the acrylic emulsion is an emulsion formed by compounding 30% of pure acrylic emulsion, 30% of styrene acrylic emulsion and 40% of silicone acrylic emulsion; the water-based additive is composed of 40% of a dispersant, 15% of a defoaming agent, 25% of a film-forming additive, 10% of a multifunctional additive and 10% of a wetting agent.

[0054] 3) feeding the liquid component obtained in step 2) into a high-speed disperser for stirring at a speed of 1200 r / min, and slowly pouring the solid component obtained in step 1) into the mixture while stirring, and mixing the two components thoroughly to obtain a solid-liquid mixture;

[0055] 4) The viscous solid-liquid mixture obtained in step 3) is placed in a low-speed disperser with a rotation speed of 150 r / min and stirred at a low speed, and after the bubbles are gradually eliminated, the fly ash water-based thermal insulation coating is obtained.

[0056] Embodiment 11:

[0057] A fly ash water-based heat-insulating paint comprises the following raw material components by mass percentage: 22% fly ash (including not less than 5% hollow ceramic microspheres and fly ash from power boilers of Huaneng Power Plant with an average particle size of about 36 μm), 6% heat-insulating powder, 8% mica powder, 33% acrylic emulsion, 11% water-based additive, 1% thickener and 19% water.

[0058] A method for preparing a fly ash water-based heat-insulating coating comprises the following steps:

[0059] 1) The thickener, fly ash, mica powder and thermal insulation powder are fully and evenly mixed to obtain a solid component, wherein the fly ash, thermal insulation powder and mica powder are functional fillers in the water-based thermal insulation coating, the fly ash is the fly ash of the power boiler of Huaneng Power Plant, the fly ash of the power boiler of Huaneng Power Plant has an average particle size of about 36 μm, and the hollow ceramic microspheres contained therein are not less than 5%; the thickener adopts sulfonate type amphoteric hydrophobically associating polyacrylamide powder or other modified amphoteric hydrophobically associating polyacrylamide powder.

[0060] 2) Fully and uniformly mix the acrylic emulsion, the water-based additive and water to obtain a liquid component; wherein the acrylic emulsion is an emulsion formed by compounding 25% of pure acrylic emulsion, 35% of styrene acrylic emulsion and 40% of silicone acrylic emulsion; the water-based additive is 40% of a dispersant, 15% of a defoaming agent, 25% of a film-forming additive, 10% of a multifunctional additive and 10% of a wetting agent.

[0061] 3) feeding the liquid component obtained in step 2) into a high-speed disperser for stirring at a speed of 1200 r / min, and slowly pouring the solid component obtained in step 1) into the mixture while stirring, and mixing the two components thoroughly to obtain a solid-liquid mixture;

[0062] 4) The viscous solid-liquid mixture obtained in step 3) is placed in a low-speed disperser with a rotation speed of 150 r / min and stirred at a low speed, and after the bubbles are gradually eliminated, a fly ash water-based thermal insulation coating is obtained.

[0063] Embodiment 12:

[0064] A fly ash water-based heat-insulating paint comprises the following raw material components by mass percentage: 20% fly ash (including not less than 5% hollow ceramic microspheres and fly ash from power boilers of Huaneng Power Plant with an average particle size of about 36 μm), 7% heat-insulating powder, 9% mica powder, 35% acrylic emulsion, 10% water-based additive, 1.5% thickener and 17.5% water.

[0065] A method for preparing a fly ash water-based heat-insulating coating comprises the following steps:

[0066] 1) The thickener, fly ash, mica powder and thermal insulation powder are fully and evenly mixed to obtain a solid component, wherein the fly ash, thermal insulation powder and mica powder are functional fillers in the water-based thermal insulation coating, the fly ash is the fly ash of the power boiler of Huaneng Power Plant, the fly ash of the power boiler of Huaneng Power Plant has an average particle size of about 36 μm, and the hollow ceramic microspheres contained therein are not less than 5%; the thickener adopts sulfonate type amphoteric hydrophobically associating polyacrylamide powder or other modified amphoteric hydrophobically associating polyacrylamide powder.

[0067] 2) Fully and uniformly mix the acrylic emulsion, water-based additive and water to obtain a liquid component; wherein the acrylic emulsion is an emulsion formed by compounding 25% pure acrylic emulsion, 40% styrene acrylic emulsion and 35% silicone acrylic emulsion; 10% water-based additive, wherein the water-based additive is composed of 40% dispersant, 15% defoaming agent, 25% film-forming additive, 10% multifunctional additive and 10% wetting agent.

[0068] 3) feeding the liquid component obtained in step 2) into a high-speed disperser for stirring at a speed of 1200 r / min, and slowly pouring the solid component obtained in step 1) into the mixture while stirring, and mixing the two components thoroughly to obtain a solid-liquid mixture;

[0069] 4) The viscous solid-liquid mixture obtained in step 3) is placed in a low-speed disperser with a rotation speed of 150 r / min and stirred at a low speed, and after the bubbles are gradually eliminated, a fly ash water-based thermal insulation coating is obtained.

[0070] Thermal insulation effect test:

[0071] In order to test the thermal insulation effect of fly ash water-based thermal insulation coating, the sample prepared in Example 10 was selected for heat dissipation simulation test: one of two heat dissipation simulation devices of the same specification was sprayed with thermal insulation coating, and the other was used as a blank comparison, and the surface heat flux density of the two heat dissipation simulation devices was tested, and the values ​​are shown in Table 1.

[0072] Table 1 shows the test results obtained by applying Example 10 on two heat dissipation simulation devices of the same specifications.

[0073]

[0074] From the test data in Table 1, it can be seen that the heat flux density of the surface of the heat dissipation simulation device sprayed with a thickness of 2mm decreased by 21-26%, and the heat flux density of the surface of the sprayed with a thickness of 3mm decreased by 32-37%, and the heat insulation effect is obvious.

[0075] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any simple modification or equivalent change made to the above embodiment based on the technical essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. A fly ash water-based thermal insulation coating, characterized in that: The invention comprises the following raw material components in percentage by weight: 20% to 25% fly ash, 4% to 10% mica powder, 5% to 10% heat insulation powder, 25.0% to 35.0% acrylic emulsion, 10.0% to 15.0% water-based additive, 1.0% to 2.0% thickener, and the balance is water.

2. The fly ash water-based thermal insulation coating according to claim 1, characterized in that: The invention comprises the following raw material components in percentage by weight: 25% fly ash, 5% mica powder, 10% heat insulation powder, 25.0% acrylic emulsion, 15.0% water-based auxiliary agent, 1.0% thickener, and the balance is water.

3. A fly ash water-based thermal insulation coating according to claim 1 or 2, characterized in that: The fly ash is fly ash from the power boiler of Huaneng Power Plant containing not less than 5% hollow ceramic microspheres.

4. A fly ash water-based heat insulation coating according to claim 1 or 2, characterized in that: The acrylic emulsion is an emulsion formed by compounding pure acrylic emulsion, styrene acrylic emulsion and silicone acrylic emulsion, wherein the compounding mass percentages of the components are: pure acrylic emulsion 30%-40%, styrene acrylic emulsion 35%-45%, silicone acrylic emulsion 25%-35%.

5. The fly ash water-based heat-insulating paint according to claim 4, characterized in that: The acrylic emulsion is an emulsion formed by compounding pure acrylic emulsion, styrene acrylic emulsion and silicone acrylic emulsion, wherein the compounding mass percentages of the components are: 30% pure acrylic emulsion, 40% styrene acrylic emulsion and 30% silicone acrylic emulsion.

6. A fly ash water-based heat-insulating paint according to claim 1 or 2, characterized in that: The aqueous additives include dispersants, defoamers, film-forming additives, multifunctional additives and wetting agents, wherein the mass percentages of the components are: dispersants 30% to 45%, defoamers 10% to 20%, film-forming additives 20% to 30%, multifunctional additives 8% to 12% and wetting agents 8% to 12%.

7. The fly ash water-based heat-insulating paint according to claim 6, characterized in that: The aqueous additives include dispersants, defoamers, film-forming aids, multifunctional aids and wetting agents, wherein the mass percentages of the components are: 40% dispersant, 15% defoamers, 25% film-forming aids, 10% multifunctional aids and 10% wetting agents.

8. A fly ash water-based heat-insulating paint according to claim 1 or 2, characterized in that: The thickener is sulfonate type amphoteric hydrophobically associating polyacrylamide powder or other modified amphoteric hydrophobically associating polyacrylamide powder.

9. A method for preparing a fly ash water-based heat-insulating coating, characterized in that: The method for preparing a fly ash water-based heat insulation coating as claimed in any one of claims 1 to 8 comprises the following steps: 1) Fully and uniformly mix the thickener, fly ash, mica powder and thermal insulation powder in the raw material components according to mass percentage to obtain a solid component; 2) Fully mixing the acrylic emulsion, water-based additive and water in the raw material components according to mass percentage to obtain a liquid component; 3) The liquid component obtained in step 2) is sent to a high-speed disperser for stirring, and the speed is set to 1200 r / min. The solid component obtained in step 1) is slowly poured into the mixture while stirring, and the two are fully mixed to obtain a solid-liquid mixture; 4) The solid-liquid mixture obtained in step 3) is placed in a low-speed disperser with a rotation speed of 150 r / min and stirred at a low speed, and after the bubbles are gradually eliminated, a fly ash water-based thermal insulation coating is obtained.

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