Water-based aerogel heat insulation coating, preparation method and application thereof

Abstract

The invention relates to a water-based aerogel heat insulation coating, a preparation method and application thereof. The coating at least comprises the following three components A, B and C. The component A comprises 0.5-3 parts of hydroxyethyl cellulose, 1-3 parts of lignocellulose filler and 100-150 parts of water; the component B comprises the following components in parts by weight: 2-8 parts of a wetting agent, 1-3 parts of a defoaming agent, 70-110 parts of water, 1-3 parts of a dispersing agent and 5-20 parts of aerogel powder; a component C: 120-180 parts of an acrylic emulsion, 30-55 parts of glass beads, 1-5 parts of dibutyl phthalate, 5-10 parts of a texanol coalescing agent and 1-4 parts of a defoaming agent; wherein the weight part of each specific component in the three components A, B and C accounts for the proportion of the raw materials formed by the three components A, B and C, and the three components A, B and C are respectively and independently stirred and uniformly mixed and then are subjected to mixed reaction; the coating has excellent heat insulation performance and environment-friendly characteristic, can be directly constructed on the surface of a high-temperature pipeline through a spraying process, and has the advantages of excellent adhesive force and low possibility of separation after long-term use.

Description

Technical Field

[0001] The present application relates to the technical field of thermal insulation materials, and specifically to a water-based aerogel thermal insulation coating, a preparation method and applications thereof. Background Art

[0002] With the rapid development of industrial production, high-temperature pipelines are increasingly used. For example, in fields such as petrochemicals, electric power, and metallurgy, high-temperature pipelines are key components for heat transmission. Excessively high surface temperatures not only waste energy but can also pose safety risks. Therefore, developing efficient and environmentally friendly thermal insulation materials to reduce the surface temperature of high-temperature pipelines has become a critical need in the current industrial field.

[0003] Traditional insulation materials, such as asbestos and glass wool, while effective, are complex to construct, have poor environmental performance, and are prone to aging and shedding after long-term use, making them difficult to meet modern industry's requirements for high efficiency, environmental friendliness, and durability. In recent years, aerogel materials have shown great potential for application in the insulation field due to their extremely low thermal conductivity, lightweight, and environmentally friendly properties. However, traditional aerogel materials typically exist in powder or block form, making them difficult to apply directly to complex surfaces. Furthermore, their poor mechanical strength and adhesion limit their practical application in high-temperature pipelines.

[0004] As an environmentally friendly material, water-based coatings have garnered widespread attention in the thermal insulation field in recent years due to their advantages such as easy construction, pollution-free operation, and strong adhesion. However, existing water-based thermal insulation coatings are prone to poor thermal stability and insufficient insulation effectiveness in high-temperature environments, making them difficult to meet the insulation requirements of high-temperature pipelines. Therefore, the development of a water-based aerogel thermal insulation coating that combines excellent thermal insulation performance, environmental friendliness, and ease of construction has become an important research direction. Summary of the Invention

[0005] In view of the above-mentioned deficiencies of the prior art, the present application provides a water-based aerogel thermal insulation coating having excellent thermal insulation performance and environmental protection characteristics. At the same time, the coating can be directly applied to the surface of high-temperature pipes through a spraying process, has excellent adhesion, and is not prone to detachment after long-term use. In order to achieve the above-mentioned purpose, the technical solution of the present application is as follows: a water-based aerogel thermal insulation coating, the raw materials of which include at least the following three components A, B and C: Component A: 0.5-3 parts of hydroxyethyl cellulose (HEC), 1-3 parts of lignocellulose filler, 100-150 parts of water; Component B: 2-8 parts wetting agent, 1-3 parts defoaming agent, 70-110 parts water, 1-3 parts dispersant, 5-20 parts aerogel powder; Component C: 120-180 parts of acrylic emulsion, 30-55 parts of glass microspheres, 1-5 parts of dibutyl phthalate (DBP), 5-10 parts of alcohol ester film-forming aid (chemical name: 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate), and 1-4 parts of defoaming agent; The weight proportions of various specific components in the three components A, B and C are the proportions in the raw materials composed of the three components A, B and C as a whole, and the three components A, B and C are stirred and mixed separately and then mixed for reaction.

[0006] Furthermore, the wetting agent type in component B is at least one selected from ATO-270, W-3500, PE-100, and ATO-6081.

[0007] Furthermore, the defoamer in component B is at least one selected from BYK-070, AFE-7620, ACP-0080, and Defom 6500.

[0008] Furthermore, the dispersant in component B is at least one selected from BYK-190, BYK-192, BYK-163, DZ-1000, and EFKA-4010.

[0009] Furthermore, the aerogel powder in component B is a hydrophobic silica aerogel powder with a specification of 300 mesh and a thermal conductivity coefficient of ≤0.015 W / (m·K), such as the silica aerogel powder prepared and produced by Xiyun New Materials Company.

[0010] Furthermore, the acrylic emulsion in component C is at least one selected from Acronal® S 760, Encor® 259, SK-6600, and DF-100.

[0011] Furthermore, the glass microspheres in component C are at least one selected from Sphericel® 110P8, HK-100, 3M™ Glass Bubbles K1, and HP-100.

[0012] Furthermore, the defoamer in component C is at least one selected from BYK-070, AFE-7620, ACP-0080, and Defom 6500.

[0013] The present application also provides a method for preparing a water-based aerogel thermal insulation coating, and the specific preparation steps of the scheme include: (1) Component A comprises the following components by weight: 0.5-3 parts of hydroxyethyl cellulose (HEC), 1-3 parts of lignocellulose filler, and 100-150 parts of water. The above components are stirred continuously at a speed of 300-600 r / min for 2-5 minutes until they are uniformly dispersed; (2) Component B includes the following components in parts by weight: 2-8 parts of wetting agent, 1-3 parts of defoaming agent, 70-110 parts of water, 1-3 parts of dispersant, and 5-20 parts of aerogel powder, and is rotated at a speed of 300 to 800 r / min for 2-10 minutes until uniformly dispersed; (3) Component C includes the following components in parts by weight: 120-180 parts of acrylic emulsion, 30-55 parts of glass microspheres, 1-5 parts of dibutyl phthalate (DBP), 5-10 parts of alcohol ester film-forming aid (chemical name: 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate), and 1-4 parts of defoaming agent. The mixture is stirred at a speed of 300-1200 r / min for 2-5 minutes until uniformly dispersed. (4) The balanced components A, B, and C are mixed again, and then further dispersed at a speed of 1800-2500 r / min for 4-8 minutes to ensure that the system is uniform and stable, thereby obtaining a water-based aerogel thermal insulation coating.

[0014] Furthermore, the wetting agent model described in step (2) is at least one selected from ATO-270, W-3500, PE-100, and ATO-6081.

[0015] Furthermore, the defoaming agent model described in step (2) is at least one selected from BYK-070, AFE-7620, ACP-0080, and Defom 6500.

[0016] Furthermore, the dispersant in step (2) is at least one selected from BYK-190, BYK-192, BYK-163, DZ-1000, and EFKA-4010.

[0017] Furthermore, the aerogel powder described in step (2) is silicon dioxide aerogel powder with a specification of 300 mesh and a thermal conductivity of ≤0.015 W / (m·K).

[0018] Furthermore, the acrylic emulsion in step (3) is at least one selected from Acronal® S 760, Encor® 259, SK-6600, and DF-100.

[0019] Furthermore, the glass microbeads in step (3) are at least one selected from Sphericel® 110P8, HK-100, 3M™ Glass Bubbles K1, and HP-100.

[0020] Furthermore, the defoaming agent model described in step (3) is at least one selected from BYK-070, AFE-7620, ACP-0080, and Defom 6500.

[0021] The present application also provides an application of the water-based aerogel thermal insulation coating prepared by the above method on high-temperature pipelines. Advantages and benefits of this application:

[0022] 1. The present application has the characteristics of simple and efficient preparation process, controllable reaction process, and green and environmentally friendly products. The various raw materials of the present application are not directly mixed and stirred, but are divided into three components: component A, component B and component C. The three components are then stirred and mixed separately, and then mixed and stirred for reaction; that is, the preparation process of the present application adopts a multi-stage speed control and gradient dispersion process, thereby effectively solving the agglomeration problem of hydrophobic SiO2 aerogel in the aqueous system, and the entire preparation process does not discharge three wastes, which is in line with the concept of green environmental protection.

[0023] 2. The water-based aerogel thermal insulation coating prepared by the present application not only has excellent thermal insulation performance and environmental protection characteristics, but can also be directly sprayed on the surface of high-temperature pipelines through a spraying process. It is convenient to construct and has strong adhesion. It is not easy to fall off after long-term use, which significantly improves the thermal insulation effect and safety of high-temperature pipelines.

[0024] 3. This application uses acrylic emulsion, aerogel powder, glass microspheres, hydroxyethyl cellulose (HEC), wood cellulose and a variety of functional additives to prepare a water-based aerogel thermal insulation coating that combines environmental performance with excellent thermal insulation effect; specifically, the coating does not contain organic solvents, is halogen-free and lead-free, complies with environmental regulations such as the RoHS Directive and REACH, significantly reduces environmental pollution, and has good environmental protection; the alcohol ester twelve film-forming agent is used as the main film-forming substance, which not only has excellent weather resistance and adhesion, but also achieves good compatibility and bonding with components such as aerogel powder and glass microspheres, thereby A dense coating forms on the surface of the coated object, achieving effective thermal insulation. The addition of hydroxyethyl cellulose (HEC) and lignocellulose enhances the coating's viscosity and adhesion, increasing bond strength when subsequently sprayed onto the wall and significantly improving its adhesion to high-temperature pipes. The use of dispersants and wetting agents effectively prevents the agglomeration of hydrophobic SiO2 aerogel powder in the aqueous system, ensuring uniform dispersion. The aerogel powder, with its extremely low thermal conductivity, effectively blocks heat conduction, while the glass microspheres reflect and scatter light, reducing heat absorption and further lowering the surface temperature. The hollow glass microspheres, in particular, possess an internal vacuum structure that significantly reduces the thermal conduction of gas molecules, further reducing the coating's thermal conductivity and enhancing its thermal insulation properties. The addition of a defoamer ensures the coating's stability and workability, preventing the formation of bubbles in the coating and improving its quality. The use of a cosolvent improves the interfacial bonding between the filler and the substrate, further enhancing the overall performance of the coating. In summary, the water-based aerogel thermal insulation coating provided in this application not only has excellent environmental performance but also exhibits significant thermal insulation effects. Its preparation process is simple, its cost is low, and it possesses high market competitiveness and broad application prospects. The coating can be directly sprayed onto high-temperature pipe surfaces, offering convenient application, strong adhesion, and resistance to long-term use, making it suitable for large-scale promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a digital photo of a sample block of the waterborne aerogel thermal insulation coating prepared in Example 1.

[0026] Figure 2 This is a macroscopic photograph of the water-based aerogel thermal insulation coating prepared in Example 1 directly sprayed on the surface of a high-temperature pipeline.

[0027] Figure 3 This is a comparison photo of the temperature of the unsprayed pipe surface and the temperature of the sprayed water-based aerogel thermal insulation coating surface after the water-based aerogel thermal insulation coating prepared in Example 1 was sprayed on the high-temperature pipe surface using a temperature measuring gun. DETAILED DESCRIPTION

[0028] The following is a clear and complete description of the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of them. Based on the embodiments of this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0029] The term "embodiment" is used herein specifically to describe any embodiment as "exemplary," and should not be construed as superior or preferable to other embodiments. Performance indicators in the embodiments of this application were tested using conventional testing methods in the art, unless otherwise specified. It should be understood that the terms used in this application are intended solely to describe specific implementations and are not intended to limit the disclosure herein.

[0030] Unless otherwise specified, the technical and scientific terms used herein have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs; other experimental methods and technical means not specifically specified in this application refer to experimental methods and technical means commonly used by ordinary technicians in this field.

[0031] In order to better illustrate the content of this application, numerous specific details are provided in the specific examples below. It should be understood by those skilled in the art that this application can be implemented without certain specific details. In the examples, some methods, means, instruments, equipment, etc. well known to those skilled in the art are not described in detail in order to highlight the main purpose of this application.

[0032] Under the premise of no conflict, the technical features disclosed in the embodiments of this application can be combined arbitrarily, and the resulting technical solutions belong to the contents disclosed in the embodiments of this application.

[0033] In order to better understand the present application, the present application is further specifically described below through the following examples, but it should not be understood as a limitation of the present application. Some non-essential improvements and adjustments made by technicians in this field based on the above invention content are also considered to fall within the scope of protection of the present application.

[0034] In the following examples of the present application, the three components A, B and C are used as raw materials for preparing the water-based aerogel thermal insulation coating of the present application. The weight parts of various specific components in the three components A, B and C are the weight parts of each of the three components in the raw materials composed of the three components A, B and C as a whole; the specific preparation process is to first weigh the various components according to the weight parts of the formula ratio, and then combine them into the corresponding three components A, B and C, and stir and mix them separately, and then mix the three components that are mixed evenly to prepare the final water-based aerogel thermal insulation coating. Example 1

[0035] (1) Component A comprises the following components by weight: 1.5 parts of hydroxyethyl cellulose (HEC), 3 parts of lignocellulose filler, and 120 parts of water. The above components are stirred at a speed of 350 r / min for 3 minutes until they are uniformly dispersed; (2) Component B includes the following components in parts by weight: 4 parts of W-3500 wetting agent, 3 parts of BYK-070 defoamer, 100 parts of water, 3 parts of BYK-190 dispersant, and 20 parts of aerogel powder, and is stirred at a speed of 350 r / min for 8 minutes until uniformly dispersed; (3) Component C includes the following components in parts by weight: 150 parts of Acronal® S 760 acrylic emulsion, 45 parts of 3M™ Glass Bubbles K1 glass microspheres, 3 parts of dibutyl phthalate (DBP), 8 parts of alcohol ester dodecanoid film-forming aid, and 3 parts of BYK-070 defoamer, and is rotated at 350 r / min for 3 minutes until uniformly dispersed; (4) Then, the evenly mixed components B and C are added to the evenly mixed component A, and the mixture is further dispersed at a speed of 2000 r / min for 5 minutes to ensure that the system is uniform and stable, thereby obtaining the water-based aerogel thermal insulation coating of the present application.

[0036] The obtained water-based aerogel thermal insulation coating was scraped onto a sample mold, left to dry, and its thermal conductivity was measured using a hot wire thermal conductivity meter. The coating was directly sprayed onto the surface of a high-temperature pipeline using a spraying process, and a temperature gun was used to test the temperature of the unsprayed pipeline surface and the temperature of the surface sprayed with the water-based aerogel thermal insulation coating to compare the thermal insulation effects. Example 2

[0037] (1) Component A comprises the following components by weight: 0.5 parts of hydroxyethyl cellulose (HEC), 1 part of lignocellulose filler, and 100 parts of water. The above components are stirred at a speed of 450 r / min for 2 minutes until they are uniformly dispersed; (2) Component B includes the following components by weight: 2 parts of ATO-270 wetting agent, 1 part of AFE-7620 defoaming agent, 80 parts of water, 2 parts of BYK-192 dispersant, and 15 parts of aerogel powder. The mixture is stirred at 450 r / min for 2 minutes until uniformly dispersed. (3) Component C includes the following components by weight: 120 parts of Encor® 259 acrylic emulsion, 30 parts of Sphericel® 110P8 glass microspheres, 2 parts of dibutyl phthalate (DBP), 5 parts of alcohol ester film-forming aid, and 1 part of AFE-7620 defoamer. The mixture is stirred at a speed of 500 r / min for 3 minutes until uniformly dispersed. (4) Then, the evenly mixed components B and C are added to the evenly mixed component A, and the mixture is further dispersed at a speed of 1800 r / min for 6 minutes to ensure that the system is uniform and stable, thereby obtaining the water-based aerogel thermal insulation coating of the present application.

[0038] The obtained water-based aerogel thermal insulation coating was scraped onto a sample mold, left to dry, and its thermal conductivity was measured using a hot wire method thermal conductivity meter. Example 3

[0039] (1) Component A includes the following components by weight: 2 parts of hydroxyethyl cellulose (HEC), 2 parts of lignocellulose filler, and 150 parts of water. The above components are stirred at a speed of 500 r / min for 2 minutes until they are uniformly dispersed; (2) Component B includes the following components by weight: 6 parts of PE-100 wetting agent, 2 parts of ACP-0080 defoaming agent, 110 parts of water, 2 parts of BYK-163 dispersant, and 10 parts of aerogel powder. The mixture is stirred at a speed of 500 r / min for 6 minutes until uniformly dispersed. (3) Component C includes the following components by weight: 180 parts of SK-6600 acrylic emulsion, 55 parts of HK-100 glass microspheres, 5 parts of dibutyl phthalate (DBP), 10 parts of alcohol ester film-forming aid, and 4 parts of ACP-0080 defoamer. The mixture is stirred at a speed of 800 r / min for 2 minutes until uniformly dispersed. (4) Then, the evenly mixed components B and C are added to the evenly mixed component A, and the mixture is further dispersed at a speed of 2200 r / min for 6 minutes to ensure that the system is uniform and stable, thereby obtaining the water-based aerogel thermal insulation coating of the present application.

[0040] The obtained water-based aerogel thermal insulation coating was scraped onto a sample mold, left to dry, and its thermal conductivity was measured using a hot wire method thermal conductivity meter. Example 4

[0041] (1) Component A comprises the following components by weight: 2.5 parts of hydroxyethyl cellulose (HEC), 1.5 parts of lignocellulose filler, and 145 parts of water. The above components are stirred at a speed of 600 r / min for 2 minutes until they are uniformly dispersed; (2) Component B includes the following components by weight: 7 parts of ATO-6081 wetting agent, 2.5 parts of Defom 6500 defoaming agent, 90 parts of water, 2 parts of DZ-1000 dispersant, and 10 parts of aerogel powder. The mixture is stirred at a speed of 450 r / min for 5 minutes until uniformly dispersed. (3) Component C includes the following components by weight: 140 parts of DF-100 acrylic emulsion, 45 parts of HP-100 glass microspheres, 4 parts of dibutyl phthalate (DBP), 8 parts of alcohol ester film-forming aid, and 3.5 parts of defoaming agent. The mixture is stirred at a speed of 800 r / min for 3 minutes until uniformly dispersed. (4) Then, the evenly mixed components B and C are added to the evenly mixed component A, and the mixture is further dispersed at a speed of 1800 r / min for 7 minutes to ensure that the system is uniform and stable, thereby obtaining the water-based aerogel thermal insulation coating of the present application.

[0042] The obtained water-based aerogel thermal insulation coating was scraped onto a sample mold, left to dry, and its thermal conductivity was measured using a hot wire method thermal conductivity meter. Example 5

[0043] (1) Component A includes the following components by weight: 1.5 parts of hydroxyethyl cellulose (HEC), 3 parts of lignocellulose filler, and 150 parts of water. The above components are stirred at a speed of 300 r / min for 5 minutes until they are uniformly dispersed; (2) Component B includes the following components by weight: 4 parts of W-3500 wetting agent, 3 parts of BYK-070 defoamer, 110 parts of water, 3 parts of BYK-190 dispersant, and 20 parts of aerogel powder. The mixture is stirred at a speed of 500 r / min for 8 minutes until uniformly dispersed. (3) Component C includes the following components by weight: 180 parts of Acronal® S 760 acrylic emulsion, 45 parts of 3M™ Glass Bubbles K1 glass microspheres, 3 parts of dibutyl phthalate (DBP), 8 parts of alcohol ester film-forming agent, and 3 parts of BYK-070 defoamer. The mixture is stirred at a speed of 1000 r / min for 2 minutes until uniformly dispersed. (4) Then, the evenly mixed components B and C are added to the evenly mixed component A, and the mixture is further dispersed at a speed of 2400 r / min for 5 minutes to ensure that the system is uniform and stable, thereby obtaining the water-based aerogel thermal insulation coating of the present application.

[0044] The obtained water-based aerogel thermal insulation coating was scraped onto a sample mold, left to dry, and its thermal conductivity was measured using a hot wire method thermal conductivity meter. Comparative Example 1

[0045] (1) Component 1 includes the following components: 1.5 parts of hydroxyethyl cellulose (HEC), 3 parts of lignocellulose filler, and 120 parts of water. The above components are stirred at a speed of 350 r / min for 3 minutes until they are uniformly dispersed; (2) Component 2 (without wetting agent): 3 parts BYK-070 defoamer, 100 parts water, 3 parts BYK-190 dispersant, 20 parts aerogel powder, at 350 r / min for 8 minutes until uniformly dispersed; (3) Component 3 includes the following components in parts by weight: 150 parts of Acronal® S 760 acrylic emulsion, 45 parts of 3M™ Glass Bubbles K1 glass microspheres, 3 parts of dibutyl phthalate (DBP), 8 parts of alcohol ester dodecanoid film-forming aid, and 3 parts of BYK-070 defoamer, and is rotated at 350 r / min for 3 minutes until uniformly dispersed; (4) The three components mixed in a balanced manner are mixed together again, and then further dispersed at a speed of 2000 r / min for 5 minutes to ensure that the system is uniform and stable, thereby obtaining the water-based aerogel thermal insulation coating of the present application.

[0046] The obtained water-based aerogel thermal insulation coating was scraped onto a sample mold, left to dry, and its thermal conductivity was measured using a hot wire method thermal conductivity meter. Comparative Example 2

[0047] (1) Component 1 includes the following components (without hydroxyethyl fiber): 3 parts of lignocellulosic filler and 120 parts of water. The above components are stirred at a speed of 450 r / min for 2 minutes until they are uniformly dispersed; (2) Component 2 includes the following components in parts by weight: 4 parts of W-3500 wetting agent, 3 parts of BYK-070 defoamer, 100 parts of water, 3 parts of BYK-190 dispersant, and 20 parts of aerogel powder, and is rotated at 450 r / min for 5 minutes until uniformly dispersed; (3) Component 3 includes the following components in parts by weight: 150 parts of Acronal® S 760 acrylic emulsion, 45 parts of 3M™ Glass Bubbles K1 glass microspheres, 3 parts of dibutyl phthalate (DBP), 8 parts of alcohol ester film-forming agent, and 3 parts of BYK-070 defoamer, and is rotated at 450 r / min for 3 minutes until uniformly dispersed; (4) The three components that were mixed evenly were mixed together again, and then further dispersed at a speed of 2200 r / min for 6 minutes to ensure that the system was uniform and stable, thereby obtaining the water-based aerogel thermal insulation coating of the present application.

[0048] The obtained water-based aerogel thermal insulation coating was scraped onto a sample mold, left to dry, and its thermal conductivity was measured using a hot wire method thermal conductivity meter. Comparative Example 3

[0049] (1) Component 1 includes the following components (without lignocellulose filler): 3 parts of hydroxyethyl cellulose (HEC) and 120 parts of water. The above components are stirred at a speed of 350 r / min for 3 minutes until they are uniformly dispersed; (2) Component 2 includes the following components in parts by weight: 4 parts of W-3500 wetting agent, 3 parts of BYK-070 defoamer, 100 parts of water, 3 parts of BYK-190 dispersant, and 20 parts of aerogel powder, and is rotated at 350 r / min for 8 minutes until uniformly dispersed; (3) Component 3 includes the following components in parts by weight: 150 parts of Acronal® S 760 acrylic emulsion, 45 parts of 3M™ Glass Bubbles K1 glass microspheres, 3 parts of dibutyl phthalate (DBP), 8 parts of alcohol ester dodecanoid film-forming aid, and 3 parts of BYK-070 defoamer, and is rotated at 350 r / min for 3 minutes until uniformly dispersed; (4) The three components that were mixed evenly were mixed together again, and then further dispersed at a speed of 2200 r / min for 6 minutes to ensure that the system was uniform and stable, thereby obtaining the water-based aerogel thermal insulation coating of the present application.

[0050] The obtained water-based aerogel thermal insulation coating was scraped onto a sample mold, left to dry, and its thermal conductivity was measured using a hot wire method thermal conductivity meter.

[0051] Table 1 below shows the thermal conductivity test results of the water-based aerogel thermal insulation coatings prepared in different embodiments and comparative examples of this application: Table 1 is the thermal conductivity test results of the water-based aerogel thermal insulation coatings prepared in different embodiments and comparative examples in this application.

[0052] As shown in Table 1, this application successfully prepared a water-based aerogel thermal insulation coating with excellent thermal insulation properties through an innovative gradient dispersion process, multiphase composite system design, and green modification technology. Its thermal conductivity can reach as low as 0.040 W / (m·K), significantly superior to traditional insulation materials. This coating is particularly suitable for thermal insulation protection of high-temperature pipelines, effectively reducing heat loss and improving energy efficiency.

[0053] See attached Figure 1 , is a digital photo of the water-based aerogel thermal insulation coating prepared in Example 1 of the present application. The coating can be made into samples of different sizes and shapes, has excellent flexibility and elasticity, and has a uniform texture.

[0054] See attached Figure 2 , is a digital photo of the site after the water-based aerogel thermal insulation coating prepared in Example 1 of this application is directly applied to the surface of a high-temperature pipeline through a spraying process. Figure 2 As can be seen in the figure, the overall surface of the pipe after spraying is uniform, presenting a smooth and beautiful effect. The water-based aerogel thermal insulation coating of the present application is not only easy to apply and can quickly cover the surface of complex-shaped pipes, but also has excellent adhesion, can be used stably for a long time in high-temperature environments, and is not prone to detachment or cracking.

[0055] See attached Figure 3 , which is an on-site photo of a temperature comparison test between the uncoated pipe surface and the coated surface using a temperature measuring gun after the water-based aerogel thermal insulation coating prepared in Example 1 was sprayed on the high-temperature pipe surface. The test results show that when the high-temperature pipe is running simultaneously, the surface temperature of the pipe without the coating is 92°C, while the surface temperature of the pipe after spraying the coating of the present application is only 44.8°C, a significant reduction of 51% in surface temperature. This intuitive temperature comparison test fully demonstrates the excellent heat resistance and thermal insulation properties of the coating of the present application in high-temperature environments. By spraying the water-based aerogel thermal insulation coating of the present application, the surface temperature of the high-temperature pipe can be effectively reduced, heat loss can be reduced, thereby improving energy utilization efficiency and reducing operating costs. In addition, the coating also has good construction performance and adhesion, can meet the spraying requirements of complex pipe structures, and provides an efficient and reliable solution for long-term thermal insulation and energy-saving operation of high-temperature pipes. This significant temperature reduction effect not only extends the service life of the pipeline, but also improves the safety of the working environment, and has important industrial application value.

[0056] In addition, compared with Example 1, which is the most preferred embodiment of the present application, the comparative example only lacks one type of additive, and the overall type of additives remains unchanged. Therefore, although the overall performance and molding are affected, the thermal conductivity coefficient will not be too high. In Examples 2-5, the type and amount of additives added have changed, which has a greater impact on the overall performance of the coating, resulting in a situation where the thermal conductivity coefficient is too high. In the preparation process of water-based coatings, the type and amount of additives added have a greater impact on the overall performance of the coating.

[0057] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present application. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A water-based aerogel thermal insulation coating, characterized by: The raw materials of the coating include at least the following three components A, B and C: Component A: 0.5-3 parts of hydroxyethyl cellulose, 1-3 parts of lignocellulose filler, 100-150 parts of water; Component B: 2-8 parts wetting agent, 1-3 parts defoaming agent, 70-110 parts water, 1-3 parts dispersant, 5-20 parts aerogel powder; Component C: 120-180 parts of acrylic emulsion, 30-55 parts of glass microspheres, 1-5 parts of dibutyl phthalate, 5-10 parts of alcohol ester film-forming aid, and 1-4 parts of defoaming agent; The weight proportions of various specific components in the three components A, B and C are the proportions in the raw materials composed of the three components A, B and C as a whole, and the three components A, B and C are stirred and mixed separately and then mixed for reaction.

2. The water-based aerogel thermal insulation coating according to claim 1, characterized in that: The wetting agent in component B is selected from at least one of ATO-270, W-3500, PE-100, and ATO-6081; the defoaming agent in component B is selected from at least one of BYK-070, AFE-7620, ACP-0080, and Defom 6500; the dispersant in component B is selected from at least one of BYK-190, BYK-192, BYK-163, DZ-1000, and EFKA-4010; and the aerogel powder in component B is a hydrophobic silica aerogel powder with a specification of 300 mesh and a thermal conductivity of ≤0.015 W / (m·K).

3. The water-based aerogel thermal insulation coating according to claim 1, characterized in that: The acrylic emulsion in component C is at least one selected from Acronal® S 760, Encor® 259, SK-6600, and DF-100; the glass microspheres in component C are at least one selected from Sphericel® 110P8, HK-100, 3M™ Glass Bubbles K1, and HP-100; and the defoamer in component C is at least one selected from BYK-070, AFE-7620, ACP-0080, and Defom 6500.

4. The method for preparing the water-based aerogel thermal insulation coating according to any one of claims 1 to 3, characterized in that: The specific preparation steps of this scheme include: (1) Component A comprises the following components by weight: 0.5-3 parts of hydroxyethyl cellulose, 1-3 parts of lignocellulose filler, and 100-150 parts of water. The above components are stirred continuously at a speed of 300-600 r / min for 2-5 minutes until they are uniformly dispersed; (2) Component B includes the following components in parts by weight: 2-8 parts of wetting agent, 1-3 parts of defoaming agent, 70-110 parts of water, 1-3 parts of dispersant, and 5-20 parts of aerogel powder, and is rotated at a speed of 300 to 800 r / min for 2-10 minutes until uniformly dispersed; (3) Component C includes the following components in parts by weight: 120-180 parts of acrylic emulsion, 30-55 parts of glass microspheres, 1-5 parts of dibutyl phthalate, 5-10 parts of alcohol ester film-forming aid, and 1-4 parts of defoaming agent, and is stirred at a speed of 300-1200 r / min for 2-5 minutes until uniformly dispersed; (4) The balanced components A, B, and C are mixed again, and then further dispersed at a rotation speed of 1800-2500 r / min for 4-8 minutes to obtain a water-based aerogel thermal insulation coating.

5. The method for preparing the water-based aerogel thermal insulation coating according to claim 4, characterized in that: The wetting agent model described in step (2) is at least one selected from ATO-270, W-3500, PE-100, and ATO-6081.

6. The method for preparing the water-based aerogel thermal insulation coating according to claim 4, characterized in that: The defoaming agent model described in step (2) is at least one selected from BYK-070, AFE-7620, ACP-0080, and Defom 6500.

7. The method for preparing the water-based aerogel thermal insulation coating according to claim 4, characterized in that: The dispersant in step (2) is at least one selected from BYK-190, BYK-192, BYK-163, DZ-1000, and EFKA-4010.

8. The method for preparing the water-based aerogel thermal insulation coating according to claim 4, characterized in that: The aerogel powder described in step (2) is silicon dioxide aerogel powder with a specification of 300 mesh and a thermal conductivity of ≤0.015 W / (m·K).

9. The method for preparing the water-based aerogel thermal insulation coating according to claim 4, characterized in that: The acrylic emulsion in step (3) is at least one selected from Acronal® S 760, Encor® 259, SK-6600, and DF-100; the glass microspheres in step (3) are at least one selected from Sphericel® 110P8, HK-100, 3M™ Glass Bubbles K1, and HP-100; the defoamer model in step (3) is at least one selected from BYK-070, AFE-7620, ACP-0080, and Defom6500.

10. Use of the water-based aerogel thermal insulation coating according to any one of claims 1 to 3 on high-temperature pipelines.

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