Water-based thermal insulation coating and preparation method thereof

Abstract

The invention relates to the technical field of coatings, in particular to a water-based thermal insulation coating and a preparation method thereof. The water-based thermal insulation coating comprises water, acrylic resin, titanium dioxide, glass beads, aerogel filler, a functional aid and a silane coupling agent according to a specific ratio. The acrylic resin is anionic styrene-acrylic resin; the true density of the glass beads is 0.18-0.42 g / cm < 3 >, the particle size D50 is 40-70 [mu] m, the compressive strength is 3-30 MPa, and the thermal conductivity at 20 DEG C is 0.03-0.06 W.m <-1 >. K <-1 >. According to the water-based heat insulation coating, by carefully selecting the types of the raw materials, optimizing the proportion of all the components and limiting key performance parameters, the excellent heat insulation performance is achieved, the heat conductivity coefficient is as low as 0.0301 W / (m.K), heat transfer is effectively blocked, and the water-based heat insulation coating is environmentally friendly and good in construction performance.

Description

Technical Field

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

[0002] Cooling energy accounts for a significant portion of building energy consumption, sometimes exceeding 50% of total energy consumption. Overheating of roofs and exterior walls, particularly in summer, is a growing concern and a key obstacle to achieving energy conservation and consumption reduction in buildings. In recent years, multifunctional composite thermal insulation coating technology has rapidly advanced, successfully breaking through the performance bottlenecks of traditional thermal insulation coatings and bringing new hope to the field of building energy conservation.

[0003] The core advantage of this technology lies in the innovative, scientific and ingenious combination of multiple functional layers, including reflective insulation, barrier insulation, and radiant cooling, resulting in a powerful synergistic effect. This synergistic effect can significantly reduce the surface temperature of the building envelope and the internal heat gain, effectively alleviating the problem of building overheating in summer and providing strong support for building energy conservation and consumption reduction. Currently, a number of highly representative high-efficiency thermal insulation and cooling technology solutions have emerged on the market, such as high-reflectivity water-based acrylic / silicone resin-based thermal insulation coatings, which enhance thermal insulation performance by compounding hollow ceramic microbeads; elastic thermal insulation coatings with added infrared radiation fillers that can effectively reflect and dissipate heat; and temperature-regulating thermal insulation coatings combined with phase change microcapsules that can automatically adjust the thermal insulation effect according to changes in ambient temperature. These coating products have demonstrated excellent thermal insulation performance in actual applications and have made important contributions to building energy conservation.

[0004] However, existing conventional water-based thermal insulation coatings face numerous technical bottlenecks that urgently need to be overcome. First, these traditional coatings have a relatively simple thermal insulation mechanism, relying primarily on passively blocking heat transfer. They achieve their insulation function solely through a single filler or resin system, lacking a synergistic mechanism between multiple components. This directly leads to high overall thermal conductivity, and their insulation efficiency falls far short of meeting the urgent demand for high-quality thermal insulation performance in modern buildings and industrial equipment. Second, conventional solvent-based thermal insulation coatings also offer limited environmental performance. These coatings use organic solvents as a dispersion medium, which releases significant amounts of volatile organic compounds during production and application. These compounds not only produce an unpleasant, irritating odor, but also pose a serious environmental risk and pose a health threat to construction workers. Furthermore, there are significant shortcomings in the rationality of the component blend. Some coatings use inappropriate acrylic resin grades or use excessive amounts, which can lead to a series of quality issues such as cracking and flaking after drying. Furthermore, when fillers such as glass microspheres and phase-change microcapsules are mixed in inappropriate proportions, an effective thermal insulation network cannot be constructed, and the thermal conductivity cannot be significantly reduced. Even worse, if phase-change microcapsules are used alone, their inherently high thermal conductivity can negatively impact the overall insulation performance, further exacerbating the shortcomings of traditional coatings in terms of thermal insulation effectiveness. Summary of the Invention

[0005] The present invention provides a water-based thermal insulation coating and a preparation method thereof, which are used to solve the problems of existing water-based thermal insulation coatings, such as insufficient thermal insulation performance, poor environmental performance and insufficient rationality of component combination.

[0006] According to a first aspect of the present invention, the present invention provides a water-based thermal insulation coating, comprising the following raw materials in parts by weight: 9.5-10.5 parts of water, 25-45 parts of acrylic resin, 3-8 parts of titanium dioxide, 14-23 parts of glass microspheres, 4.5-6.5 parts of aerogel filler, 3-10 parts of functional additives and 0.15-0.35 parts of silane coupling agent; The acrylic resin is an anionic styrene-acrylic resin; the true density of the glass microspheres is 0.18-0.42 g / cm 3 The particle size D50 is 40-70 μm, the compressive strength is 3-30 MPa, and the thermal conductivity at 20 ° C is 0.03-0.06 W·m -1 ·K -1 .

[0007] The water-based thermal insulation coating of the present invention uses anionic styrene acrylic resin as the acrylic resin, which has good film-forming properties and compatibility with other components in the coating, helping to form a uniform and stable coating film. The glass microspheres have a low true density, which can effectively reduce the thermal conductivity of the coating and achieve good thermal insulation effect. The particle size D50 is in the range of 40-70μm, which can effectively balance the smoothness and thermal insulation performance of the coating film. The compressive strength is between 3-30MPa, which ensures that the glass microspheres are not easily broken during the production, construction and use of the coating, ensuring the durability and stability of its thermal insulation performance. The thermal conductivity at 20°C is as low as 0.03-0.06 W·m -1 ·K -1 , significantly improving the thermal insulation efficiency of the coating, effectively reducing heat transfer, and thus achieving excellent thermal insulation effect. The water-based thermal insulation coating of the present invention limits the weight of each raw material of the water-based thermal insulation coating, as well as the performance parameters of the acrylic resin type and glass beads, so that multiple raw materials cooperate with each other, so that the coating has good thermal insulation effect, can effectively block heat transfer, and reduce heat absorption of buildings or equipment. At the same time, it ensures that the water-based thermal insulation coating of the present invention is uniform in state in the container, has good construction performance, has no abnormalities in the 48-hour water resistance test, has a normal appearance after drying, has good flexibility, and does not crack, peel or blister.

[0008] Furthermore, traditional solvent-based thermal insulation coatings contain large amounts of hazardous organic solvents, which release toxic substances during application and use, posing a threat to the environment and human health. This invention utilizes a fully water-based system. The raw materials used in its production and application processes are odorless and release no toxic gases, meeting environmental standards. This addresses the pollution issues associated with traditional coatings at the source, meeting the needs of green building and industrial environmental protection, and is suitable for environmentally sensitive applications such as building exteriors and food storage.

[0009] Furthermore, the acrylic resin has a mass solids content of 45-50%, a pH value of 7.0-9.0, a viscosity of 100-1200 mPa·s, a glass transition temperature of 35-40°C, and a minimum film-forming temperature of 25-30°C. Further limitations on the mass solids content, pH value, viscosity, glass transition temperature, and minimum film-forming temperature of the acrylic resin ensure greater compatibility and synergy with other components in the coating system, helping to improve the overall performance of the coating.

[0010] In some specific embodiments, the acrylic resin is ARCHSOL® 8119 produced by Wanhua Chemical Group Co., Ltd.

[0011] Furthermore, the coating comprises the following raw materials in parts by weight: 4-7 parts of phase-change microcapsules. The addition of a specific amount of phase-change microcapsules imparts to the coating excellent active temperature regulation, enabling the coating to not only passively insulate but also automatically adjust its insulation effect based on changes in ambient temperature, thereby enhancing the functionality and adaptability of the coating.

[0012] Preferably, the phase change temperature of the phase change microcapsules is 20-40°C. Phase change microcapsules undergo phase changes within a specific temperature range, absorbing or releasing heat, thereby regulating ambient temperature changes and further enhancing the thermal insulation properties of the coating. This can better maintain a stable internal temperature in buildings, especially when large daily temperature fluctuations occur.

[0013] More preferably, the phase change temperature of the phase change microcapsule is 20-30°C, the shell material is melamine urea-formaldehyde resin, the core material is biomass phase change wax, and the particle size is 1-2 μm. In some specific embodiments, the phase change microcapsule is selected from MPCM25 of Shanghai Ruentropy New Energy Technology Co., Ltd.

[0014] Furthermore, the glass microbeads include first glass microbeads and second glass microbeads, and the true density of the first glass microbeads is 0.18-0.22 g / cm 3 The particle size D50 is 55-65μm, the compressive strength is 3-4MPa, and the thermal conductivity at 20℃ is 0.03-0.045W·m -1 ·K -1 The true density of the second glass microsphere is 0.38-0.42 g / cm 3 The particle size D50 is 45-55μm, the compressive strength is 25-30MPa, and the thermal conductivity at 20℃ is 0.05-0.06W·m -1 ·K -1 .

[0015] Glass microspheres are divided into first-class and second-class glass microspheres, and their true density, particle size D50, compressive strength, and thermal conductivity are defined separately. This allows the two types of microspheres to play different roles in the coating. The first-class glass microspheres focus on providing lower thermal conductivity to enhance thermal insulation, while the second-class glass microspheres provide higher compressive strength while maintaining certain thermal insulation performance, improving the mechanical properties of the coating. By rationally combining the two glass microspheres with different properties, a good balance between thermal insulation and coating strength is achieved, avoiding the problem of simply pursuing one performance aspect at the expense of other properties.

[0016] Furthermore, the weight ratio of the first glass microbeads, the second glass microbeads, and the phase-change microcapsules is (4.8-6.7): (6.7-11): (4.2-6.7). By optimizing and limiting the weight ratio of the first glass microbeads, the second glass microbeads, and the phase-change microcapsules, the three achieve an optimal synergistic effect in the coating. The phase-change microcapsules and the two glass microbeads work together to form a more efficient thermal insulation structure, further reducing thermal conductivity and improving thermal insulation.

[0017] In some specific embodiments, the water-based thermal insulation coating of the present invention utilizes a scientific combination of acrylic resin, aerogel filler, glass microspheres (GS20, GS40), and phase-change microcapsules MPCM25 to create a synergistic "passive insulation + active heat absorption" mechanism. The low thermal conductivity of the aerogel filler and hollow glass microspheres effectively reduces overall heat conduction, while the phase-change microcapsules impart heat absorption and energy storage to the coating, transcending the traditional single-mode thermal insulation approach. Test data demonstrates that the coating's thermal conductivity is as low as 0.0301-0.0317 W / (m·K), significantly improving insulation efficiency compared to existing technologies. This can significantly reduce building energy consumption, the risk of high temperatures in industrial equipment, and the loss of stored materials.

[0018] Furthermore, the water-based thermal insulation coating comprises the following raw materials in parts by weight: 9.5-10.5 parts water, 30-40 parts acrylic resin, 4-6 parts titanium dioxide, 4.8-6.7 parts first glass microspheres, 6.7-11 parts second glass microspheres, 4.2-6.7 parts phase change microcapsules, 4.5-5.5 parts aerogel filler, 4-7 parts functional additives, and 0.15-0.25 parts silane coupling agent. This raw material ratio ensures that the thermal insulation performance and comprehensive physical properties of the water-based thermal insulation coating are more stable and excellent.

[0019] Furthermore, the specific surface area of the aerogel filler is 400-700m 2 / g, porosity>90%, pore size 10-20nm, bulk density 60-120kg / m 3 , a hydrophobic angle greater than 145°, and a thermal conductivity of 0.017-0.023 W / (m∙K). By rationally limiting the specific surface area, porosity, pore size, bulk density, hydrophobic angle, and thermal conductivity of the aerogel filler, it achieves extremely low thermal conductivity and excellent hydrophobicity, further enhancing the coating's thermal insulation and water resistance. Furthermore, the high specific surface area and porosity facilitate better integration with other components, improving the coating's overall performance.

[0020] In some specific embodiments, the aerogel filler is purchased from Anhui Keang New Material Technology Co., Ltd. KNF-W.

[0021] Furthermore, the functional additives include one or more of a film-forming aid, an antifreeze agent, a dispersant, a defoaming agent, a bactericide and a thickener.

[0022] The dispersant is selected from one or more of a polycarboxylate dispersant, a modified polyurethane dispersant, and a naphthalenesulfonate dispersant, preferably a modified polyurethane dispersant. By selecting a polycarboxylate, modified polyurethane, or naphthalenesulfonate dispersant, and preferably a modified polyurethane dispersant, the dispersion of solid particles in the coating can be significantly enhanced, the coating stability and uniformity can be improved, and the mechanical properties, water resistance, and thermal insulation of the coating film can be improved. Furthermore, the application performance is optimized, making the coating easier to apply and forming a high-performance coating film, thereby meeting the thermal insulation requirements of building exterior walls and industrial equipment.

[0023] Furthermore, the defoamer is selected from one or more of silicone defoamers, polyether defoamers, and mineral oil defoamers, preferably polyether defoamers. The selection of silicone, polyether, or mineral oil defoamers, preferably polyether defoamers, effectively eliminates bubbles generated during the coating production and application process, improving the coating's appearance quality and application performance. Furthermore, the defoamer exhibits good compatibility and stability, reduces coating production costs, and improves production efficiency, meeting the requirements for large-scale production and application of water-based thermal insulation coatings.

[0024] Furthermore, the antifreeze agent is selected from one or more of ethylene glycol, propylene glycol, and glycerol. By selecting an antifreeze agent such as ethylene glycol, propylene glycol, or glycerol, the freezing point of the water-based thermal insulation coating can be effectively lowered in low-temperature environments, preventing the coating from freezing, ensuring its stability and fluidity during storage and application, and improving the cold resistance of the coating, thereby expanding the application range of the coating in cold regions or under low-temperature conditions.

[0025] Furthermore, the thickener is selected from one or more of an inorganic thickener, a cellulose thickener, a polyacrylate thickener, and a polyurethane thickener, preferably a polyurethane thickener. By selecting an inorganic thickener, a cellulose thickener, a polyacrylate thickener, or a polyurethane thickener, preferably a polyurethane thickener, the rheological properties of the water-based thermal insulation coating can be effectively adjusted, improving its application performance, preventing sagging during application, and enhancing the coating's stability and thixotropy, thereby improving the coating's storage stability and application efficiency.

[0026] Furthermore, the film-forming aid is selected from one or more of alcohol ester film-forming aids, alcohol ether film-forming aids, and ester film-forming aids, preferably alcohol ester film-forming aids. By selecting alcohol ester, alcohol ether, or ester film-forming aids, and preferably alcohol ester film-forming aids, the film-forming temperature of the water-based thermal insulation coating can be significantly reduced, allowing the coating to form a continuous and uniform coating film even at lower temperatures, effectively improving the appearance and performance of the coating film, while also increasing the coating's construction adaptability and early water resistance, ensuring the coating's application effectiveness under different environmental conditions.

[0027] Preferably, the water-based thermal insulation coating includes the following raw materials in parts by weight: 9.5-10.5 parts of water, 2-3 parts of dispersant, 0.2-0.4 parts of defoaming agent, 30-40 parts of acrylic resin, 4-6 parts of titanium dioxide, 4.8-6.7 parts of first glass microbeads, 6.7-11 parts of second glass microbeads, 4.2-6.7 parts of phase change microcapsules, 4.5-5.5 parts of aerogel filler, 1.5-2.5 parts of film-forming aid, 0.1-0.3 parts of antifreeze, 0.2-0.4 parts of fungicide, 0.05-0.15 parts of thickener and 0.15-0.25 parts of silane coupling agent.

[0028] According to a second aspect of the present invention, the present invention also provides a method for preparing the above-mentioned water-based thermal insulation coating, comprising the following steps: (1) First, acrylic resin, aerogel filler, functional additives, titanium dioxide, silane coupling agent and water are mixed to form a base coating; (2) Then, glass microspheres are added to the base coating and mixed.

[0029] The preparation method of the present invention first mixes part of the raw materials to form a base coating, and then adds glass beads for mixing, which is beneficial to avoid the glass beads from breaking during the high-speed mixing process, while ensuring that the components are fully dispersed, thereby improving the quality and performance consistency of the coating.

[0030] Preferably, the mixing rate in step (1) is 800-900 r / min and the time is 20-40 min; the mixing rate in step (2) is 200-600 r / min and the time is 10-20 min. By limiting the mixing rate and time of each step, the uniformity of the coating mixing during the production process is ensured.

[0031] According to a third aspect of the present invention, the present invention also provides the use of the above-mentioned water-based thermal insulation coating in thermal insulation protection of building exterior walls or industrial equipment.

[0032] Beneficial effects of the present invention: The water-based thermal insulation coating provided by the present invention achieves excellent thermal insulation performance by carefully selecting the types of raw materials, optimizing the proportions of each component, and defining key performance parameters. The thermal conductivity coefficient is as low as 0.0301 W / (m·K), effectively blocking heat transfer. At the same time, the coating has good environmental performance. It uses water as the dispersion medium, reduces the use of organic solvents, and reduces the emission of volatile organic compounds. It has excellent construction performance, good coating and rheological properties, is easy to construct and operate, and forms a uniform coating film after drying. It has excellent comprehensive physical properties, such as water resistance, flexibility, weather resistance, and scrub resistance, can adapt to different environmental conditions, and has a long service life. In addition, the stability and storage performance of the coating are also significantly improved, solving the problems of cracking and peeling caused by unreasonable component compounding in the prior art. DETAILED DESCRIPTION

[0033] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention are described clearly and completely below. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0034] The sources of raw materials used in the following examples and comparative examples are as follows: Acrylic resins: ARCHSOL® 8119, BLJ-KD96, and YC-8360 were purchased from Wanhua Chemical Group Co., Ltd., Haibao Lijia Chemical Co., Ltd., and Guangdong Yinyang Environmental Protection New Materials Co., Ltd., respectively. Aerogel filler: KNF-W, purchased from Anhui Keang New Material Technology Co., Ltd. Glass microspheres: GS20, GS40, and GS25 were purchased from Sinosteel Ma'anshan Mining Institute New Materials Technology Co., Ltd., and C25 was purchased from Zhongke Huaxing New Materials Co., Ltd. Ceramic microspheres: DGH-T, purchased from Shanghai Gerunya Nanomaterials Co., Ltd. Phase change microcapsules: MPCM25 and PCM-BM-35 were purchased from Shanghai Ruentropy New Energy Technology Co., Ltd. and Nantong Aochu New Energy Technology Co., Ltd., respectively; Dispersant: KERPERDISP®-6600, purchased from Zhuhai Jintuan Chemical Co., Ltd. Titanium dioxide: R215, purchased from China National Nuclear Huayuan Titanium Dioxide Co., Ltd. Defoaming agent: SGR1940, purchased from Xingrui (Shandong) Environmental Technology Co., Ltd. Film-forming aid: TEXANOL, purchased from Shanghai Kaiyin Chemical Co., Ltd. Antifreeze: ethylene glycol, purchased from Shandong Tongda Chemical Technology Co., Ltd. Fungicide: GY-KS3, purchased from Changzhou Runyang Chemical Co., Ltd. Thickener: A406, purchased from Nanjing Qinghai Trading Co., Ltd. Silane coupling agent: USi-1302, purchased from Nanjing Liansi Chemical Co., Ltd.

[0035] Example 1 This embodiment provides a water-based thermal insulation coating, which is composed of the following components in parts by weight: Acrylic resin (ARCHSOL®8119) 25 parts, aerogel filler (KNF-W) 5 parts, glass microspheres (GS20) 20 parts, dispersant (KERPERDISP®-6600) 2.5 parts, titanium dioxide (R215) 5 parts, defoamer (SGR1940) 0.3 parts, film-forming aid (TEXANOL) 2 parts, antifreeze 0.2 parts, fungicide (GY-KS3) 0.3 parts, thickener (A406) 0.1 parts, silane coupling agent (USi-1302) 0.2 parts, water 10 parts.

[0036] This embodiment also provides a method for preparing the water-based thermal insulation coating, comprising the following steps: (1) First, acrylic resin, aerogel filler, titanium dioxide, phase change microcapsules, dispersant, defoamer, bactericide, antifreeze, silane coupling agent, thickener, film-forming aid and water are mixed evenly and dispersed at high speed (800~900r / min) for 30min to form a base coating.

[0037] (2) Then add the hollow glass microspheres into the base coating, disperse it at a low speed (200-600 r / min) for 15 minutes, and stir evenly to obtain a water-based thermal insulation coating.

[0038] Example 2 This embodiment provides a water-based thermal insulation coating, which is composed of the following components in parts by weight: Acrylic resin (ARCHSOL®8119) 30 parts, aerogel filler (KNF-W) 5 parts, glass microspheres (GS20) 20 parts, dispersant (KERPERDISP®-6600) 2.5 parts, titanium dioxide (R215) 5 parts, defoamer (SGR1940) 0.3 parts, film-forming aid (TEXANOL) 2 parts, antifreeze 0.2 parts, fungicide (GY-KS3) 0.3 parts, thickener (A406) 0.1 parts, silane coupling agent (USi-1302) 0.2 parts, water 10 parts.

[0039] This embodiment also provides a preparation method of the water-based thermal insulation coating, and the preparation method is the same as that of Example 1.

[0040] Example 3 This embodiment provides a water-based thermal insulation coating, which is composed of the following components in parts by weight: Acrylic resin (ARCHSOL®8119) 35 parts, aerogel filler (KNF-W) 5 parts, glass microspheres (GS20) 20 parts, dispersant (KERPERDISP®-6600) 2.5 parts, titanium dioxide (R215) 5 parts, defoamer (SGR1940) 0.3 parts, film-forming aid (TEXANOL) 2 parts, antifreeze 0.2 parts, fungicide (GY-KS3) 0.3 parts, thickener (A406) 0.1 parts, silane coupling agent (USi-1302) 0.2 parts, water 10 parts.

[0041] This embodiment also provides a preparation method of the water-based thermal insulation coating, and the preparation method is the same as that of Example 1.

[0042] Example 4 This embodiment provides a water-based thermal insulation coating, which is composed of the following components in parts by weight: Acrylic resin (ARCHSOL®8119) 40 parts, aerogel filler (KNF-W) 5 parts, glass microspheres (GS20) 20 parts, dispersant (KERPERDISP®-6600) 2.5 parts, titanium dioxide (R215) 5 parts, defoamer (SGR1940) 0.3 parts, film-forming aid (TEXANOL) 2 parts, antifreeze 0.2 parts, fungicide (GY-KS3) 0.3 parts, thickener (A406) 0.1 parts, silane coupling agent (USi-1302) 0.2 parts, water 10 parts.

[0043] This embodiment also provides a preparation method of the water-based thermal insulation coating, and the preparation method is the same as that of Example 1.

[0044] Example 5 This embodiment provides a water-based thermal insulation coating, which is composed of the following components in parts by weight: Acrylic resin (ARCHSOL®8119) 45 parts, aerogel filler (KNF-W) 5 parts, glass microspheres (GS20) 20 parts, dispersant (KERPERDISP®-6600) 2.5 parts, titanium dioxide (R215) 5 parts, defoamer (SGR1940) 0.3 parts, film-forming aid (TEXANOL) 2 parts, antifreeze 0.2 parts, fungicide (GY-KS3) 0.3 parts, thickener (A406) 0.1 parts, silane coupling agent (USi-1302) 0.2 parts, water 10 parts.

[0045] This embodiment also provides a preparation method of the water-based thermal insulation coating, and the preparation method is the same as that of Example 1.

[0046] Example 6 This embodiment provides a water-based thermal insulation coating, which is composed of the following components in parts by weight: Acrylic resin (ARCHSOL®8119) 35 parts, aerogel filler (KNF-W) 5 parts, glass microspheres (GS20) 14 parts, dispersant (KERPERDISP®-6600) 2.5 parts, titanium dioxide (R215) 5 parts, defoamer (SGR1940) 0.3 parts, film-forming aid (TEXANOL) 2 parts, antifreeze 0.2 parts, fungicide (GY-KS3) 0.3 parts, thickener (A406) 0.1 parts, silane coupling agent (USi-1302) 0.2 parts, water 10 parts.

[0047] This embodiment also provides a preparation method of the water-based thermal insulation coating, and the preparation method is the same as that of Example 1.

[0048] Example 7 This embodiment provides a water-based thermal insulation coating, which is composed of the following components in parts by weight: Acrylic resin (ARCHSOL®8119) 35 parts, aerogel filler (KNF-W) 5 parts, glass microspheres (GS20) 17 parts, dispersant (KERPERDISP®-6600) 2.5 parts, titanium dioxide (R215) 5 parts, defoamer (SGR1940) 0.3 parts, film-forming aid (TEXANOL) 2 parts, antifreeze 0.2 parts, fungicide (GY-KS3) 0.3 parts, thickener (A406) 0.1 parts, silane coupling agent (USi-1302) 0.2 parts, water 10 parts.

[0049] This embodiment also provides a preparation method of the water-based thermal insulation coating, and the preparation method is the same as that of Example 1.

[0050] Example 8 This embodiment provides a water-based thermal insulation coating, which is composed of the following components in parts by weight: Acrylic resin (ARCHSOL®8119) 35 parts, aerogel filler (KNF-W) 5 parts, glass microspheres (GS20) 23 parts, dispersant (KERPERDISP®-6600) 2.5 parts, titanium dioxide (R215) 5 parts, defoamer (SGR1940) 0.3 parts, film-forming aid (TEXANOL) 2 parts, antifreeze 0.2 parts, fungicide (GY-KS3) 0.3 parts, thickener (A406) 0.1 parts, silane coupling agent (USi-1302) 0.2 parts, water 10 parts.

[0051] This embodiment also provides a preparation method of the water-based thermal insulation coating, and the preparation method is the same as that of Example 1.

[0052] Example 9 This embodiment provides a water-based thermal insulation coating, which is composed of the following components in parts by weight: Acrylic resin (ARCHSOL®8119) 35 parts, aerogel filler (KNF-W) 2 parts, glass microspheres (GS20) 17 parts, dispersant (KERPERDISP®-6600) 2.5 parts, titanium dioxide (R215) 5 parts, defoamer (SGR1940) 0.3 parts, film-forming aid (TEXANOL) 2 parts, antifreeze 0.2 parts, fungicide (GY-KS3) 0.3 parts, thickener (A406) 0.1 parts, silane coupling agent (USi-1302) 0.2 parts, water 10 parts.

[0053] This embodiment also provides a preparation method of the water-based thermal insulation coating, and the preparation method is the same as that of Example 1.

[0054] Example 10 This embodiment provides a water-based thermal insulation coating, which is composed of the following components in parts by weight: Acrylic resin (ARCHSOL®8119) 35 parts, aerogel filler (KNF-W) 8 parts, glass microspheres (GS20) 17 parts, dispersant (KERPERDISP®-6600) 2.5 parts, titanium dioxide (R215) 5 parts, defoamer (SGR1940) 0.3 parts, film-forming aid (TEXANOL) 2 parts, antifreeze 0.2 parts, fungicide (GY-KS3) 0.3 parts, thickener (A406) 0.1 parts, silane coupling agent (USi-1302) 0.2 parts, water 10 parts.

[0055] This embodiment also provides a preparation method of the water-based thermal insulation coating, and the preparation method is the same as that of Example 1.

[0056] Example 11 This embodiment provides a water-based thermal insulation coating, which is composed of the following components in parts by weight: Acrylic resin (ARCHSOL®8119) 35 parts, aerogel filler (KNF-W) 5 parts, glass microspheres (GS20) 5.3 parts, glass microspheres (GS40) 9.5 parts, phase change microcapsules (MPCM25) 5.2 parts, dispersant (KERPERDISP®-6600) 2.5 parts, titanium dioxide (R215) 5 parts, defoamer (SGR1940) 0.3 parts, film-forming aid (TEXANOL) 2 parts, antifreeze 0.2 parts, fungicide (GY-KS3) 0.3 parts, thickener (A406) 0.1 parts, silane coupling agent (USi-1302) 0.2 parts, water 10 parts.

[0057] This embodiment also provides a preparation method of the water-based thermal insulation coating, and the preparation method is the same as that of Example 1.

[0058] Example 12 This embodiment provides a water-based thermal insulation coating, which is composed of the following components in parts by weight: Acrylic resin (ARCHSOL®8119) 35 parts, aerogel filler (KNF-W) 5 parts, glass microspheres (GS20) 5 parts, glass microspheres (GS40) 10 parts, phase change microcapsules (MPCM25) 5 parts, dispersant (KERPERDISP®-6600) 2.5 parts, titanium dioxide (R215) 5 parts, defoaming agent (SGR1940) 0.3 parts, film-forming aid (TEXANOL) 2 parts, antifreeze agent 0.2 parts, fungicide (GY-KS3) 0.3 parts, thickener (A406) 0.1 parts, silane coupling agent (USi-1302) 0.2 parts, water 10 parts.

[0059] This embodiment also provides a preparation method of the water-based thermal insulation coating, and the preparation method is the same as that of Example 1.

[0060] Example 13 This embodiment provides a water-based thermal insulation coating, which is composed of the following components in parts by weight: Acrylic resin (ARCHSOL®8119) 35 parts, aerogel filler (KNF-W) 5 parts, glass microspheres (GS20) 4.8 parts, glass microspheres (GS40) 10.5 parts, phase change microcapsules (MPCM25) 4.8 parts, dispersant (KERPERDISP®-6600) 2.5 parts, titanium dioxide (R215) 5 parts, defoaming agent (SGR1940) 0.3 parts, film-forming aid (TEXANOL) 2 parts, antifreeze agent 0.2 parts, fungicide (GY-KS3) 0.3 parts, thickener (A406) 0.1 parts, silane coupling agent (USi-1302) 0.2 parts, water 10 parts.

[0061] This embodiment also provides a preparation method of the water-based thermal insulation coating, and the preparation method is the same as that of Example 1.

[0062] Example 14 This embodiment provides a water-based thermal insulation coating, which is composed of the following components in parts by weight: Acrylic resin (ARCHSOL®8119) 35 parts, aerogel filler (KNF-W) 5 parts, glass microspheres (GS20) 5.3 parts, glass microspheres (GS40) 10.5 parts, phase change microcapsules (MPCM25) 4.2 parts, dispersant (KERPERDISP®-6600) 2.5 parts, titanium dioxide (R215) 5 parts, defoamer (SGR1940) 0.3 parts, film-forming aid (TEXANOL) 2 parts, antifreeze 0.2 parts, fungicide (GY-KS3) 0.3 parts, thickener (A406) 0.1 parts, silane coupling agent (USi-1302) 0.2 parts, water 10 parts.

[0063] This embodiment also provides a preparation method of the water-based thermal insulation coating, and the preparation method is the same as that of Example 1.

[0064] Example 15 This embodiment provides a water-based thermal insulation coating, which is composed of the following components in parts by weight: Acrylic resin (ARCHSOL®8119) 35 parts, aerogel filler (KNF-W) 5 parts, glass microspheres (GS20) 4.8 parts, glass microspheres (GS40) 9.5 parts, phase change microcapsules (MPCM25) 5.7 parts, dispersant (KERPERDISP®-6600) 2.5 parts, titanium dioxide (R215) 5 parts, defoamer (SGR1940) 0.3 parts, film-forming aid (TEXANOL) 2 parts, antifreeze 0.2 parts, fungicide (GY-KS3) 0.3 parts, thickener (A406) 0.1 parts, silane coupling agent (USi-1302) 0.2 parts, water 10 parts.

[0065] This embodiment also provides a preparation method of the water-based thermal insulation coating, and the preparation method is the same as that of Example 1.

[0066] Example 16 This embodiment provides a water-based thermal insulation coating, which is composed of the following components in parts by weight: Acrylic resin (ARCHSOL®8119) 35 parts, aerogel filler (KNF-W) 5 parts, glass microspheres (GS20) 6.7 parts, glass microspheres (GS40) 6.7 parts, phase change microcapsules (MPCM25) 6.7 parts, dispersant (KERPERDISP®-6600) 2.5 parts, titanium dioxide (R215) 5 parts, defoaming agent (SGR1940) 0.3 parts, film-forming aid (TEXANOL) 2 parts, antifreeze agent 0.2 parts, fungicide (GY-KS3) 0.3 parts, thickener (A406) 0.1 parts, silane coupling agent (USi-1302) 0.2 parts, water 10 parts.

[0067] This embodiment also provides a preparation method of the water-based thermal insulation coating, and the preparation method is the same as that of Example 1.

[0068] Example 17 This embodiment provides a water-based thermal insulation coating, which is composed of the following components in parts by weight: Acrylic resin (ARCHSOL®8119) 35 parts, aerogel filler (KNF-W) 5 parts, glass microspheres (GS20) 5 parts, glass microspheres (C25) 10 parts, phase change microcapsules (MPCM25) 5 parts, dispersant (KERPERDISP®-6600) 2.5 parts, titanium dioxide (R215) 5 parts, defoaming agent (SGR1940) 0.3 parts, film-forming aid (TEXANOL) 2 parts, antifreeze agent 0.2 parts, fungicide (GY-KS3) 0.3 parts, thickener (A406) 0.1 parts, silane coupling agent (USi-1302) 0.2 parts, water 10 parts.

[0069] This embodiment also provides a preparation method of the water-based thermal insulation coating, and the preparation method is the same as that of Example 1.

[0070] Example 18 This embodiment provides a water-based thermal insulation coating, which is composed of the following components in parts by weight: Acrylic resin (ARCHSOL®8119) 35 parts, aerogel filler (KNF-W) 5 parts, glass microspheres (GS40) 5 parts, glass microspheres (C25) 10 parts, phase change microcapsules (MPCM25) 5 parts, dispersant (KERPERDISP®-6600) 2.5 parts, titanium dioxide (R215) 5 parts, defoaming agent (SGR1940) 0.3 parts, film-forming aid (TEXANOL) 2 parts, antifreeze 0.2 parts, fungicide (GY-KS3) 0.3 parts, thickener (A406) 0.1 parts, silane coupling agent (USi-1302) 0.2 parts, water 10 parts.

[0071] This embodiment also provides a preparation method of the water-based thermal insulation coating, and the preparation method is the same as that of Example 1.

[0072] Example 19 This embodiment provides a water-based thermal insulation coating, which is composed of the following components in parts by weight: Acrylic resin (ARCHSOL®8119) 35 parts, aerogel filler (KNF-W) 5 parts, glass microspheres (GS20) 5 parts, glass microspheres (GS40) 10 parts, phase change microcapsules (PCM-BM-35) 5 parts, dispersant (KERPERDISP®-6600) 2.5 parts, titanium dioxide (R215) 5 parts, defoaming agent (SGR1940) 0.3 parts, film-forming aid (TEXANOL) 2 parts, antifreeze agent 0.2 parts, fungicide (GY-KS3) 0.3 parts, thickener (A406) 0.1 parts, silane coupling agent (USi-1302) 0.2 parts, water 10 parts.

[0073] In this embodiment, the model of the phase change microcapsule is changed to PCM-BM-35, and the other components are the same as those in Example 12.

[0074] This embodiment also provides a preparation method of the water-based thermal insulation coating, and the preparation method is the same as that of Example 1.

[0075] Comparative Example 1 This comparative example provides a water-based thermal insulation coating, which is composed of the following components in parts by weight: Acrylic resin (BLJ-KD96) 35 parts, aerogel filler (KNF-W) 5 parts, glass microspheres (GS20) 20 parts, dispersant (KERPERDISP®-6600) 2.5 parts, titanium dioxide (R215) 5 parts, defoamer (SGR1940) 0.3 parts, film-forming aid (TEXANOL) 2 parts, antifreeze 0.2 parts, fungicide (GY-KS3) 0.3 parts, thickener (A406) 0.1 parts, silane coupling agent (USi-1302) 0.2 parts, water 10 parts.

[0076] In this comparative example, the acrylic resin model was changed to BLJ-KD96, and the other components were the same as those in Example 3.

[0077] This comparative example also provides a preparation method of the water-based thermal insulation coating, and the preparation method is the same as that of Example 1.

[0078] Comparative Example 2 This comparative example provides a water-based thermal insulation coating, which is composed of the following components in parts by weight: Acrylic resin (YC-8360) 35 parts, aerogel filler (KNF-W) 5 parts, glass microspheres (GS20) 20 parts, dispersant (KERPERDISP®-6600) 2.5 parts, titanium dioxide (R215) 5 parts, defoamer (SGR1940) 0.3 parts, film-forming aid (TEXANOL) 2 parts, antifreeze 0.2 parts, fungicide (GY-KS3) 0.3 parts, thickener (A406) 0.1 parts, silane coupling agent (USi-1302) 0.2 parts, water 10 parts.

[0079] In this comparative example, the acrylic resin model was changed to YC-8360, and the other components were the same as those in Example 3.

[0080] This comparative example also provides a preparation method of the water-based thermal insulation coating, and the preparation method is the same as that of Example 1.

[0081] Comparative Example 3 This comparative example provides a water-based thermal insulation coating, which is composed of the following components in parts by weight: Acrylic resin (ARCHSOL®8119) 15 parts, aerogel filler (KNF-W) 5 parts, glass microspheres (GS20) 20 parts, dispersant (KERPERDISP®-6600) 2.5 parts, titanium dioxide (R215) 5 parts, defoamer (SGR1940) 0.3 parts, film-forming aid (TEXANOL) 2 parts, antifreeze 0.2 parts, fungicide (GY-KS3) 0.3 parts, thickener (A406) 0.1 parts, silane coupling agent (USi-1302) 0.2 parts, water 10 parts.

[0082] In this comparative example, the amount of acrylic resin was reduced to 15 parts, and the remaining components were the same as those in Example 3.

[0083] This comparative example also provides a preparation method of the water-based thermal insulation coating, and the preparation method is the same as that of Example 1.

[0084] Comparative Example 4 This comparative example provides a water-based thermal insulation coating, which is composed of the following components in parts by weight: Acrylic resin (ARCHSOL®8119) 55 parts, aerogel filler (KNF-W) 5 parts, glass microspheres (GS20) 20 parts, dispersant (KERPERDISP®-6600) 2.5 parts, titanium dioxide (R215) 5 parts, defoamer (SGR1940) 0.3 parts, film-forming aid (TEXANOL) 2 parts, antifreeze 0.2 parts, fungicide (GY-KS3) 0.3 parts, thickener (A406) 0.1 parts, silane coupling agent (USi-1302) 0.2 parts, water 10 parts.

[0085] In this comparative example, the amount of acrylic resin was increased to 55 parts, and the remaining components were the same as those in Example 3.

[0086] This comparative example also provides a preparation method of the water-based thermal insulation coating, and the preparation method is the same as that of Example 1.

[0087] Comparative Example 5 This comparative example provides a water-based thermal insulation coating, which is composed of the following components in parts by weight: Acrylic resin (ARCHSOL®8119) 35 parts, aerogel filler (KNF-W) 5 parts, glass microspheres (GS20) 5 parts, ceramic microspheres (DGH-T) 10 parts, phase change microcapsules (MPCM25) 5 parts, dispersant (KERPERDISP®-6600) 2.5 parts, titanium dioxide (R215) 5 parts, defoaming agent (SGR1940) 0.3 parts, film-forming aid (TEXANOL) 2 parts, antifreeze 0.2 parts, fungicide (GY-KS3) 0.3 parts, thickener (A406) 0.1 parts, silane coupling agent (USi-1302) 0.2 parts, water 10 parts.

[0088] In this comparative example, the glass microspheres (GS40) were replaced with ceramic microspheres (DGH-T), and the remaining components were the same as those in Example 12.

[0089] This comparative example also provides a preparation method of the water-based thermal insulation coating, and the preparation method is the same as that of Example 1.

[0090] Thermal conductivity is a key indicator of a coating's insulation performance. The instrument used in this study is the HFM 446 heat flow thermal conductivity meter from NETZSCH (Shanghai), Germany. The thermal insulation coating was applied to a 30×30×1 cm plate and dried. The temperature of the cold plate was set at 15°C, and the temperature of the hot plate at 35°C. Thermal conductivity was measured at room temperature. Therefore, this study conducted tests based on actual application scenarios; unless otherwise specified, testing was performed at a standard room temperature of 23°C.

[0091] State in container: Test in accordance with 6.11 of T / CECS 10126-2021 Aerogel Thermal Insulation Thick Coating Systems.

[0092] Workability: Test in accordance with 6.12 of T / CECS 10126-2021 Aerogel Insulation Thick Coating System.

[0093] 48h water resistance: Tested in accordance with 6.16 of T / CECS 10126-2021 "Aerogel Insulation Thick Coating System".

[0094] Appearance after drying: Test in accordance with 6.13 of T / CECS 10126-2021 Aerogel Insulation Thick Coating System.

[0095] Flexibility test: Test in accordance with 6.14 of T / CECS 10126-2021 Aerogel Insulation Thick Coating System.

[0096] The test results are listed in Table 1 below: Table 1

[0097] The experimental data in Table 1 demonstrates that the water-based thermal insulation coatings prepared in this invention exhibit excellent thermal insulation properties, with thermal conductivity ranging from 0.0301 to 0.0731 W / (m·K), significantly lower than the thermal conductivity range of traditional building insulation materials, significantly reducing heat transfer. The coatings in each example exhibited uniformity in the container, good application performance, and no abnormalities in the 48-hour water resistance test. After drying, the coatings exhibited normal appearance and good flexibility, with no cracking, flaking, or blistering. Example 12 exhibited the lowest thermal conductivity, reaching 0.0301 W / (m·K).

[0098] The test results of Examples 1-10 show that the thermal conductivity of the water-based thermal insulation coatings obtained by applying Examples 3-5, Example 7, and Example 9 is 0.0325-0.0479 W / (m·K) (<0.05 W / (m·K)); while the thermal conductivity of the water-based thermal insulation coatings obtained by applying Examples 1-2, Example 6, Example 8, and Example 10 is 0.0514-0.0731 W / (m·K) (>0.05 W / (m·K)). This indicates that the present invention further controls the weight of acrylic resin, aerogel filler, and glass microbeads in the water-based thermal insulation coating within a specific range, thereby achieving a better synergistic effect between these raw materials and improving the thermal insulation performance of the resulting water-based thermal insulation coating.

[0099] Comparison of Example 3 with Comparative Examples 1-4 demonstrates that when ARCHSOL® 8119 acrylic resin is used within the range of 25-45 parts per million (as in Example 3), the resulting water-based thermal insulation coating exhibits significantly superior thermal insulation performance, with a thermal conductivity as low as 0.0325 W / (m·K). The coating also exhibits excellent overall physical properties (water resistance, flexibility, and dry appearance), with no cracking, flaking, or blistering. However, Comparative Examples 1 and 2, due to the use of different acrylic resin types (BLJ-KD96 and YC-8360), and Comparative Example 3, due to insufficient acrylic resin dosage (15 parts per million), and Comparative Example 4, due to excessive acrylic resin dosage (55 parts per million), exhibit thermal conductivities as high as 0.0828 W / (m·K), 0.0746 W / (m·K), 0.0795 W / (m·K), and 0.0844 W / (m·K), respectively. Furthermore, some of the comparative examples exhibited coating cracking, flaking, or blistering. This shows that the present invention can significantly improve the thermal insulation performance and physical stability of the coating by selecting a specific type of acrylic resin and accurately controlling its dosage range.

[0100] Comparison of Example 12 with Comparative Example 5 shows that Example 12, using glass microspheres (GS20 and GS40) of specific specifications and dosages and phase-change microcapsules (MPCM25), achieves a thermal conductivity as low as 0.0301 W / (m·K), demonstrating excellent thermal insulation. The coating also exhibits excellent overall physical properties (water resistance, flexibility, dry appearance, etc.), with no cracking, flaking, or blistering. In contrast, in Comparative Example 5, replacing some of the glass microspheres with ceramic microspheres significantly increases the thermal conductivity to 0.0851 W / (m·K), while significantly decreasing the thermal insulation performance. This demonstrates that the specific specifications and dosages of glass microspheres, combined with the phase-change microcapsules, used in this invention significantly enhance the thermal insulation performance of the coating, whereas the use of ceramic microspheres fails to achieve the same effect.

[0101] Comparison of Examples 3 and 11-16 shows that Example 3, which uses only a single type of glass microspheres, has a thermal conductivity of 0.0325 W / (m·K). However, by combining two different specifications of glass microspheres, GS20 and GS40, with phase-change microcapsules (MPCM25), and optimizing the weight ratio of the three to a range of (4.8-6.7):(6.7-11):(4.2-6.7), the thermal conductivity is further reduced to 0.0301-0.0323 W / (m·K), demonstrating even better thermal insulation performance. A comparison of Example 12 with Examples 17-19 shows that Example 12, which uses GS20 and GS40 glass microspheres in combination with MPCM25 phase-change microcapsules, achieves a thermal conductivity of 0.0301 W / (m·K), demonstrating excellent overall performance. After replacing part of the GS40 microspheres or GS20 microspheres with the C25 model in Examples 17 and 18, the thermal conductivity increased to 0.0424 W / (m·K) and 0.0437 W / (m·K), respectively, and the thermal insulation performance decreased. Example 19 used phase change microcapsules PCM-BM-35, and the thermal conductivity increased to 0.0662 W / (m·K), which highlights the superiority of the glass microsphere type, ratio and phase change microcapsule model in Example 12. This shows that the present invention can significantly improve the thermal insulation effect of the coating by rationally compounding glass microspheres and phase change microcapsules of different specifications, demonstrating the advantage of the synergistic effect of multiple components. At the same time, the comprehensive physical properties of all examples were good, without cracking, peeling or blistering.

[0102] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A water-based thermal insulation coating, characterized in that: The invention comprises the following raw materials in parts by weight: 9.5-10.5 parts of water, 25-45 parts of acrylic resin, 3-8 parts of titanium dioxide, 14-23 parts of glass microspheres, 4.5-6.5 parts of aerogel filler, 3-10 parts of functional additives and 0.15-0.35 parts of silane coupling agent; The acrylic resin is an anionic styrene-acrylic resin; the true density of the glass microspheres is 0.18-0.42 g / cm 3 The particle size D50 is 40-70 μm, the compressive strength is 3-30 MPa, and the thermal conductivity at 20 ° C is 0.03-0.06 W·m -1 ·K -1 .

2. The water-based thermal insulation coating according to claim 1, characterized in that: The acrylic resin has a mass solid content of 45-50%, a pH value of 7.0-9.0, a viscosity of 100-1200 mPa·s, a glass transition temperature of 35-40° C., and a minimum film-forming temperature of 25-30° C.

3. The water-based thermal insulation coating according to claim 1 or 2, characterized in that: The following raw materials are also included in parts by weight: 4-7 parts of phase change microcapsules; Preferably, the phase change temperature of the phase change microcapsules is 20-40°C; More preferably, the phase change temperature of the phase change microcapsules is 20-30° C., the shell material is melamine urea-formaldehyde resin, the core material is biomass phase change wax, and the particle size is 1-2 μm.

4. The water-based thermal insulation coating according to claim 3, characterized in that: The glass microbeads include first glass microbeads and second glass microbeads, wherein the true density of the first glass microbeads is 0.18-0.22 g / cm 3 The particle size D50 is 55-65μm, the compressive strength is 3-4MPa, and the thermal conductivity at 20℃ is 0.03-0.045W·m -1 ·K -1 The true density of the second glass microsphere is 0.38-0.42 g / cm 3 The particle size D50 is 45-55μm, the compressive strength is 25-30MPa, and the thermal conductivity at 20℃ is 0.05-0.06W·m -1 ·K -1 ; Preferably, the weight ratio of the first glass microbeads, the second glass microbeads and the phase-change microcapsules is (4.8-6.7): (6.7-11): (4.2-6.7).

5. The water-based thermal insulation coating according to claim 4, characterized in that: The invention comprises the following raw materials in parts by weight: 9.5-10.5 parts of water, 30-40 parts of acrylic resin, 4-6 parts of titanium dioxide, 4.8-6.7 parts of first glass microbeads, 6.7-11 parts of second glass microbeads, 4.2-6.7 parts of phase change microcapsules, 4.5-5.5 parts of aerogel filler, 4-7 parts of functional additives and 0.15-0.25 parts of silane coupling agent.

6. The water-based thermal insulation coating according to any one of claims 1 to 5, characterized in that: The specific surface area of the aerogel filler is 400-700m 2 / g, porosity>90%, pore size 10-20nm, bulk density 60-120kg / m 3 , hydrophobic angle > 145°, thermal conductivity is 0.017-0.023W / (m∙K).

7. The water-based thermal insulation coating according to any one of claims 1 to 6, characterized in that: The functional additives include one or more of a film-forming aid, an antifreeze agent, a dispersant, a defoaming agent, a bactericide and a thickener; Preferably, the dispersant is selected from one or more of polycarboxylate dispersants, modified polyurethane dispersants and naphthalenesulfonate dispersants, preferably a modified polyurethane dispersant; And / or, the defoaming agent is selected from one or more of silicone defoaming agents, polyether defoaming agents and mineral oil defoaming agents, preferably a polyether defoaming agent; And / or, the antifreeze agent is selected from one or more of ethylene glycol, propylene glycol and glycerol; and / or, the thickener is selected from one or more of an inorganic thickener, a cellulose thickener, a polyacrylate thickener, and a polyurethane thickener, preferably a polyurethane thickener; And / or, the film-forming aid is selected from one or more of alcohol ester film-forming aids, alcohol ether film-forming aids and ester film-forming aids, preferably an alcohol ester film-forming aid.

8. The water-based thermal insulation coating according to claim 7, characterized in that: The invention comprises the following raw materials in parts by weight: 9.5-10.5 parts of water, 2-3 parts of dispersant, 0.2-0.4 parts of defoaming agent, 30-40 parts of acrylic resin, 4-6 parts of titanium dioxide, 4.8-6.7 parts of first glass microbeads, 6.7-11 parts of second glass microbeads, 4.2-6.7 parts of phase change microcapsules, 4.5-5.5 parts of aerogel filler, 1.5-2.5 parts of film-forming aid, 0.1-0.3 parts of antifreeze agent, 0.2-0.4 parts of fungicide, 0.05-0.15 parts of thickener and 0.15-0.25 parts of silane coupling agent.

9. The method for preparing the water-based thermal insulation coating according to any one of claims 1 to 8, characterized in that: The steps include: (1) First, acrylic resin, aerogel filler, functional additives, titanium dioxide, silane coupling agent and water are mixed to form a base coating; (2) Then, glass microbeads are added to the base coating and mixed; Preferably, the mixing rate in step (1) is 800-900 r / min, and the time is 20-40 min; the mixing rate in step (2) is 200-600 r / min, and the time is 10-20 min.

10. Use of the water-based thermal insulation coating according to any one of claims 1 to 8 in thermal insulation protection of building exterior walls or industrial equipment.

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