Aqueous thermal barrier coating and method of making the same

Abstract

The present application relates to the technical field of paint, and particularly relates to a water-based thermal insulation paint and a preparation method thereof.The water-based thermal insulation paint of the present application comprises water, acrylic resin, titanium white powder, glass microbeads, aerogel filler, functional additive and silane coupling agent in a specific ratio;the acrylic resin is an anionic styrene-acrylic resin;the glass microbeads have a true density of 0.18-0.42 g / cm 3 , a particle size D50 of 40-70 mu m, a compressive strength of 3-30 MPa, and a thermal conductivity of 0.03-0.06 W·m ‑1 ·K ‑1 at 20 DEG C. The water-based thermal insulation paint of the present application realizes excellent thermal insulation performance by carefully selecting the types of raw materials, optimizing the component ratio and limiting the key performance parameters, has a thermal conductivity as low as 0.0301 W / (m·K), effectively blocks heat transfer, is environmentally friendly, and has good construction performance.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of coating technology, in particular to a water-based thermal insulation coating and a preparation method thereof. BACKGROUND

[0002] In the composition of building energy consumption, refrigeration energy consumption accounts for a considerable proportion, and even in some cases, it will exceed 50% of the total building energy consumption. Especially in summer, the overheating phenomenon of roof and external wall is more and more prominent, which has become a key problem restricting the process of building energy saving. In recent years, the technology of multifunctional composite thermal insulation coating has developed rapidly, which has successfully broken through the performance bottleneck of traditional thermal insulation coating and brought new light to the field of building energy saving.

[0003] The core advantage of this technology lies in the scientific and ingenious combination of various functional layers such as reflective insulation, barrier insulation, and radiation cooling, which produces a strong synergistic effect. This synergistic effect can significantly reduce the surface temperature of building envelope and internal heat gain, effectively alleviating the problem of building overheating in summer and providing strong support for building energy saving. At present, a batch of highly representative high-efficiency thermal insulation and cooling technology solutions have emerged in the market, such as high-reflectivity water-based acrylic / silicone resin-based thermal insulation coating, which enhances the thermal insulation performance by combining hollow ceramic microbeads; elastic thermal insulation coating with added infrared radiation fillers, which can effectively reflect and dissipate heat; and temperature-regulating thermal insulation coating combined with phase change microcapsules, which can automatically adjust the thermal insulation effect according to environmental temperature changes. These coating products have shown excellent thermal insulation performance in practical applications and have made important contributions to building energy saving.

[0004] However, at the same time, the existing conventional water-based thermal insulation coatings are facing many technical bottlenecks and need to be broken through. First of all, the thermal insulation mechanism of these traditional coatings is relatively single. They mainly rely on passive heat transfer blocking, and only through a single filler or resin system to achieve thermal insulation function, lacking the mechanism of mutual synergy between multiple components. This directly leads to high overall thermal conductivity, and the thermal insulation efficiency far cannot meet the urgent demand of modern buildings and industrial equipment for high-standard thermal insulation performance. Secondly, in terms of environmental performance, the traditional solvent-based thermal insulation coatings also perform poorly. This type of coating uses organic solvents as a dispersion medium, which will release a large amount of volatile organic compounds during production and construction. These compounds not only produce unpleasant irritating odors, but also cause serious environmental pollution and threaten the health of construction personnel. In addition, there is a clear lack of rationality in component compounding. Some coatings do not choose the type of acrylic resin properly, or the amount exceeds the reasonable range, which will cause a series of quality problems such as cracking and peeling of the coating after drying. Moreover, when the compounding ratio of fillers such as glass beads and phase change microcapsules is unreasonable, it is impossible to build an effective thermal insulation network structure, and the thermal conductivity cannot be significantly reduced. Even worse, if phase change microcapsules are used alone, due to their high thermal conductivity, they will have a negative impact on the overall thermal insulation performance, further exacerbating the shortcomings of traditional coatings in thermal insulation effect. SUMMARY

[0005] The present application provides a kind of water-based thermal insulation coating and preparation method thereof, to solve the problems such as insufficient thermal insulation performance, lack of environmental performance and insufficient rationality of component compounding of existing water-based thermal insulation coating.

[0006] According to the first aspect of the present application, the present application provides a kind of water-based thermal insulation coating, including the following weight parts of raw materials: water 9.5-10.5 parts, acrylic resin 25-45 parts, titanium dioxide 3-8 parts, glass beads 14-23 parts, aerogel filler 4.5-6.5 parts, functional additives 3-10 parts and silane coupling agent 0.15-0.35 parts;

[0007] 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 μm, the compressive strength is 3-30 MPa, and the thermal conductivity at 20℃ is 0.03-0.06 W·m -1 ·K -1 .

[0008] The water-based thermal insulation coating of the present application selects an anionic styrene-acrylic resin as the acrylic resin, has good film-forming performance and compatibility with other components in the coating, and helps to form a uniform and stable coating film; the glass microbeads 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 40-70pm, which can better balance the smoothness and thermal insulation performance of the coating film; the compressive strength is between 3-30MPa, which can ensure that the glass microbeads are not easily broken during coating production, construction and use, and ensure the durability and stability of the thermal insulation performance; the thermal conductivity at 20°C is as low as 0.03-0.06 W·m -1 ·K -1 , which significantly improves the thermal insulation efficiency of the coating and effectively reduces heat transfer, thereby achieving excellent thermal insulation effect. The water-based thermal insulation coating of the present application limits the weight parts of each raw material of the water-based thermal insulation coating, and limits the type of acrylic resin and the performance parameters of glass microbeads, so that multiple raw materials cooperate with each other, so that the coating has good thermal insulation effect, can effectively block heat transfer, reduce heat absorption of buildings or equipment, while ensuring that the water-based thermal insulation coating of the present application is uniform in state in the container, has good construction performance, no abnormality in 48-hour water resistance test, normal appearance after drying and good flexibility, without cracking, peeling or blistering.

[0009] In addition, traditional solvent-based thermal insulation coatings contain a large amount of harmful organic solvents, which release toxic substances during construction and use, threatening the environment and human health. The present application uses a full water-based system, and the selected raw materials have no irritating odor and no toxic gas release during production and construction, meeting the environmental protection standard requirements, solving the pollution problem of traditional coatings from the source, meeting the green building and industrial environmental protection needs, and being suitable for environmentally sensitive building facades, food storage and other scenes.

[0010] Further, the mass solid content of the acrylic resin is 45-50%, the pH value is 7.0-9.0, the viscosity is 100-1200mPa·s, the glass transition temperature is 35-40℃, and the minimum film-forming temperature is 25-30℃. Further limiting the mass solid content, pH value, viscosity, glass transition temperature and minimum film-forming temperature and other parameters of the acrylic resin makes it better compatible and work together with other components in the coating system, which helps to improve the comprehensive performance of the coating.

[0011] In some specific embodiments, the acrylic resin is ARCHSOL®8119 of Wanhua Chemical Group Co., Ltd.

[0012] Further, the raw materials further include phase change microcapsules 4-7 parts by weight. The addition of the phase change microcapsules in the specific amount endows the coating with excellent active temperature adjustment function, so that the coating not only has passive heat insulation effect, but also can automatically adjust the heat insulation effect according to the change of the external environment temperature, thereby improving the functionality and adaptability of the coating.

[0013] Preferably, the phase change temperature of the phase change microcapsules is 20-40℃. The phase change microcapsules change phase in a specific temperature range and absorb or release heat, thereby playing a role in adjusting the change of the environment temperature and further enhancing the heat insulation performance of the coating, especially in the case of large daily temperature difference, which can better maintain the stability of the internal temperature of the building.

[0014] More preferably, the phase change temperature of the phase change microcapsules is 20-30℃, the shell material is melamine urea-formaldehyde resin, the core material is biomass phase change wax, and the particle size is 1-2μm. In some specific embodiments, the phase change microcapsules are selected from MPCM25 of Shanghai Ruoneng New Energy Technology Co., Ltd.

[0015] Further, the glass microbeads include first glass microbeads and second glass microbeads, the first glass microbeads have a true density of 0.18-0.22g / cm 3 , a particle size D50 of 55-65μm, a compressive strength of 3-4MPa, and a thermal conductivity of 0.03-0.045W·m -1 ·K -1 at 20℃, and the second glass microbeads have a true density of 0.38-0.42g / cm 3 , a particle size D50 of 45-55μm, a compressive strength of 25-30MPa, and a thermal conductivity of 0.05-0.06W·m -1 ·K -1 at 20℃.

[0016] The glass microbeads are divided into first glass microbeads and second glass microbeads, and the true density, particle size D50, compressive strength and thermal conductivity and other parameters thereof are respectively limited, so that the two kinds of microbeads play different roles in the coating. The first glass microbeads focus on providing lower thermal conductivity to enhance the heat insulation effect, and the second glass microbeads provide higher compressive strength on the basis of ensuring certain heat insulation performance, thereby improving the mechanical properties of the coating. By reasonably matching the two kinds of glass microbeads with different properties, a good balance between the heat insulation performance and the strength of the coating is achieved, thereby avoiding the problem of the decline of other properties caused by the pursuit of a certain aspect of performance.

[0017] Further, 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 the weight ratio of the first glass microbeads, the second glass microbeads and the phase change microcapsules, the best synergistic effect of the three in the coating is achieved, the phase change microcapsules cooperate with the two kinds of glass microbeads to form a more efficient heat insulation structure, further reducing the thermal conductivity and improving the heat insulation effect.

[0018] In some specific embodiments, the water-based thermal insulation coating of the present application forms a "passive barrier + active heat absorption" synergistic mechanism through scientific compounding of acrylic resin, aerogel filler, glass microbeads (GS20, GS40) and phase change microcapsules MPCM25: the low thermal conductivity of the aerogel filler and the hollow glass microbeads effectively reduces the overall heat conduction, and the phase change microcapsules endow the coating with heat absorption and energy storage functions, breaking through the traditional single heat insulation mode. Test data shows that the thermal conductivity of the coating is as low as 0.0301-0.0317 W / (m·K), which significantly improves the heat insulation efficiency compared with the prior art, and can greatly reduce the energy consumption of buildings, the high temperature risk of industrial equipment and the loss of stored materials.

[0019] Further, the water-based thermal insulation coating comprises the following raw materials by weight: water 9.5-10.5 parts, acrylic resin 30-40 parts, titanium dioxide 4-6 parts, first glass microbeads 4.8-6.7 parts, second glass microbeads 6.7-11 parts, phase change microcapsules 4.2-6.7 parts, aerogel filler 4.5-5.5 parts, functional additives 4-7 parts and silane coupling agent 0.15-0.25 parts. The raw material ratio can ensure that the thermal insulation performance and comprehensive physical properties of the water-based thermal insulation coating are more stable and excellent.

[0020] Further, the specific surface area of the aerogel filler is 400-700 m 2 / g, the porosity is >90%, the pore size is 10-20 nm, the bulk density is 60-120 kg / m 3 , the hydrophobic angle is >145°, and the thermal conductivity is 0.017-0.023 W / (m·K). By reasonably limiting the specific surface area, porosity, pore size, bulk density, hydrophobic angle and thermal conductivity of the aerogel filler, the aerogel filler has extremely low thermal conductivity and good hydrophobicity, further enhancing the thermal insulation performance and water resistance of the coating. At the same time, high specific surface area and porosity are beneficial to better combination with other components, improving the overall performance of the coating.

[0021] In some specific embodiments, the aerogel filler is purchased from Anhui Keang New Material Technology Co., Ltd. KNF-W.

[0022] Further, the functional additives include one or more of film-forming additives, antifreeze agents, dispersants, defoaming agents, bactericides and thickening agents.

[0023] The dispersant is selected from one or more of polycarboxylate dispersants, modified polyurethane dispersants and naphthalenesulfonate dispersants, preferably modified polyurethane dispersants. By selecting polycarboxylate, modified polyurethane or naphthalenesulfonate dispersants, and preferably modified polyurethane dispersants, the dispersing effect of solid particles in the coating can be significantly enhanced, the stability and uniformity of the coating can be improved, the mechanical properties, water resistance and thermal insulation effect of the coating film can be improved, and the application performance can be optimized, so that the coating is easier to apply and can form a coating film with excellent performance, meeting the needs of building exterior walls and industrial equipment thermal insulation protection.

[0024] Further, the defoaming agent is selected from one or more of silicone defoaming agents, polyether defoaming agents and mineral oil defoaming agents, preferably polyether defoaming agents. By selecting silicone, polyether or mineral oil defoaming agents, and preferably polyether defoaming agents, the bubbles generated during the production and application of the coating can be effectively eliminated, the appearance quality and application performance of the coating can be improved, and the defoaming agent has good compatibility and stability, which can reduce the production cost of the coating and improve the production efficiency, meeting the large-scale production and application needs of water-based thermal insulation coatings.

[0025] Further, the antifreeze agent is selected from one or more of ethylene glycol, propylene glycol and glycerol. By selecting ethylene glycol, propylene glycol or glycerol as the antifreeze agent, the freezing point of the water-based thermal insulation coating can be effectively reduced in low temperature environments, preventing the coating from freezing and ensuring its stability and flowability during storage and application, while improving the cold resistance of the coating and expanding its application range in cold regions or low temperature conditions.

[0026] Further, the thickening agent is selected from one or more of inorganic thickening agents, cellulose thickening agents, polyacrylate thickening agents and polyurethane thickening agents, preferably polyurethane thickening agents. By selecting inorganic thickening agents, cellulose thickening agents, polyacrylate thickening agents or polyurethane thickening agents, and preferably polyurethane thickening agents, the rheological properties of the water-based thermal insulation coating can be effectively adjusted, the application performance can be improved, and the stability and thixotropy of the coating can be enhanced, which helps to improve the storage stability and application efficiency of the coating.

[0027] Further, 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, so that the coating can form a continuous and uniform coating film at a lower temperature, effectively improving the appearance and performance of the coating film, and improving the application adaptability and early water resistance of the coating, ensuring the application effect of the coating under different environmental conditions.

[0028] Preferably, the water-based thermal insulation coating comprises the following raw materials by weight: water 9.5-10.5 parts, dispersant 2-3 parts, defoaming agent 0.2-0.4 parts, acrylic resin 30-40 parts, titanium white powder 4-6 parts, first glass microbeads 4.8-6.7 parts, second glass microbeads 6.7-11 parts, phase change microcapsules 4.2-6.7 parts, aerogel filler 4.5-5.5 parts, film-forming aid 1.5-2.5 parts, anti-freezing agent 0.1-0.3 parts, bactericide 0.2-0.4 parts, thickening agent 0.05-0.15 parts, and silane coupling agent 0.15-0.25 parts.

[0029] According to a second aspect of the present application, the present application further provides a preparation method of the above-mentioned water-based thermal insulation coating, comprising the following steps:

[0030] (1) First, mix the acrylic resin, aerogel filler, functional aid, titanium white powder, silane coupling agent, and water to form a base coating;

[0031] (2) Then, add the glass microbeads to the base coating and mix.

[0032] The preparation method of the present application first mixes part of the raw materials to form a base coating, and then adds glass microbeads for mixing, which is beneficial to avoid the breakage of glass microbeads during high-speed mixing, while ensuring the full dispersion of each component and improving the quality and performance consistency of the coating.

[0033] 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 during production is ensured.

[0034] According to a third aspect of the present application, the present application further provides the use of the above-mentioned water-based thermal insulation coating in the thermal insulation and protection of building exterior walls or industrial equipment.

[0035] The present application has the following advantages:

[0036] The water-based thermal insulation coating provided by the application realizes excellent thermal insulation performance by carefully selecting the types of raw materials, optimizing the component ratio of each component, and limiting the key performance parameters, the thermal conductivity is as low as 0.0301 W / (m·K), and the heat transfer is effectively blocked; at the same time, the coating has good environmental protection performance, uses water as a dispersion medium, reduces the use of organic solvents, and reduces the emission of volatile organic compounds; the construction performance is excellent, has good coating and rheological performance, is easy to operate, and forms a uniform coating film after drying; the comprehensive physical performance is excellent, the water resistance, flexibility, weather resistance and scrub resistance are all good, 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 cracking and peeling problems caused by unreasonable component compounding in the prior art. DETAILED DESCRIPTION

[0037] In order to make the objects, technical solutions and advantages of the present application clearer, the technical solutions in the present application will be described clearly and completely below. Obviously, the described embodiments are some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0038] The raw materials used in the following examples and comparative examples are as follows:

[0039] Acrylic resin: ARCHSOL®8119, BLJ-KD96, YC-8360, purchased from Wanhua Chemical Group Co., Ltd., Haibolijia Chemical Co., Ltd., and Guangdong Yinyang New Material Co., Ltd., respectively;

[0040] Aerogel filler: KNF-W, purchased from Anhui Kaoang New Material Technology Co., Ltd.;

[0041] Glass microbeads: GS20, GS40, GS25, purchased from Maanshan Mining Institute New Material Technology Co., Ltd., and C25, purchased from Zhongke Huaxing New Material Co., Ltd.;

[0042] Ceramic microbeads: DGH-T, purchased from Shanghai Gruen Nanomaterials Co., Ltd.;

[0043] Phase change microcapsules: MPCM25, PCM-BM-35, purchased from Shanghai Ruensi New Energy Technology Co., Ltd. and Nantong Aochu New Energy Technology Co., Ltd., respectively;

[0044] Dispersant: KERPERDISP®-6600, purchased from Zhuhai Jintuan Chemical Co., Ltd.;

[0045] Titanium dioxide: R215, purchased from China Nuclear Huaguan Titanium Dioxide Co., Ltd.;

[0046] Defoaming agent: SGR1940, purchased from Xingge (Shandong) Environmental Science and Technology Co., Ltd.

[0047] Film forming aid: TEXANOL, purchased from Shanghai Kaiyin Chemical Co., Ltd.

[0048] Antifreeze: ethylene glycol, purchased from Shandong Tongda Chemical Co., Ltd.

[0049] Bactericide: GY-KS3, purchased from Changzhou Runyang Chemical Co., Ltd.

[0050] Thickening agent: A406, purchased from Nanjing Qinhai Business and Trade Co., Ltd.

[0051] Silane coupling agent: USi-1302, purchased from Nanjing Liansi Chemical Co., Ltd.

[0052] Example 1

[0053] The embodiment provides a kind of water-based thermal insulation paint, it is by following weight parts of component composition:

[0054] Acrylic resin (ARCHSOL®8119) 25 parts, aerogel filler (KNF-W) 5 parts, glass bead (GS20) 20 parts, dispersing agent (KERPERDISP®-6600) 2.5 parts, titanium white (R215) 5 parts, defoaming agent (SGR1940) 0.3 parts, film forming aid (TEXANOL) 2 parts, antifreeze 0.2 parts, bactericide (GY-KS3) 0.3 parts, thickening agent (A406) 0.1 parts, silane coupling agent (USi-1302) 0.2 parts, water 10 parts.

[0055] The embodiment also provides the preparation method of the water-based thermal insulation paint, including the following steps:

[0056] (1) first, acrylic resin, aerogel filler, titanium white, phase change microcapsule, dispersing agent, defoaming agent, bactericide, antifreeze, silane coupling agent, thickening agent, film forming aid and water are mixed uniformly, and are dispersed at high speed (800~900r / min) for 30min, and form base paint.

[0057] (2) then, hollow glass bead is added to base paint, and is dispersed at low speed (200-600r / min) for 15min, and is stirred uniformly, and obtains water-based thermal insulation paint.

[0058] Example 2

[0059] The embodiment provides a kind of water-based thermal insulation paint, it is by following weight parts of component composition:

[0060] Acrylic resin (ARCHSOL® 8119) 30 parts, aerogel filler (KNF-W) 5 parts, glass microbeads (GS20) 20 parts, dispersing agent (KERPERDISP® -6600) 2.5 parts, titanium white (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, thickening agent (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, which is the same as that in Embodiment 1.

[0062] Embodiment 3

[0063] This embodiment provides a water-based thermal insulation coating, which is composed of the following components in parts by weight:

[0064] Acrylic resin (ARCHSOL® 8119) 35 parts, aerogel filler (KNF-W) 5 parts, glass microbeads (GS20) 20 parts, dispersing agent (KERPERDISP® -6600) 2.5 parts, titanium white (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, thickening agent (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, which is the same as that in Embodiment 1.

[0066] Embodiment 4

[0067] This embodiment provides a water-based thermal insulation coating, which is composed of the following components in parts by weight:

[0068] Acrylic resin (ARCHSOL® 8119) 40 parts, aerogel filler (KNF-W) 5 parts, glass microbeads (GS20) 20 parts, dispersing agent (KERPERDISP® -6600) 2.5 parts, titanium white (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, thickening agent (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, which is the same as that in Embodiment 1.

[0070] Embodiment 5

[0071] The present embodiment provides a water-based thermal barrier coating, which is composed of the following components in parts by weight:

[0072] Acrylic resin (ARCHSOL® 8119) 45 parts, aerogel filler (KNF-W) 5 parts, glass microbeads (GS20) 20 parts, dispersing agent (KERPERDISP® -6600) 2.5 parts, titanium white (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, thickening agent (A406) 0.1 parts, silane coupling agent (USi-1302) 0.2 parts, water 10 parts.

[0073] The present embodiment also provides a preparation method of the water-based thermal barrier coating, which is the same as that of Embodiment 1.

[0074] Embodiment 6

[0075] The present embodiment provides a water-based thermal barrier coating, which is composed of the following components in parts by weight:

[0076] Acrylic resin (ARCHSOL® 8119) 35 parts, aerogel filler (KNF-W) 5 parts, glass microbeads (GS20) 14 parts, dispersing agent (KERPERDISP® -6600) 2.5 parts, titanium white (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, thickening agent (A406) 0.1 parts, silane coupling agent (USi-1302) 0.2 parts, water 10 parts.

[0077] The present embodiment also provides a preparation method of the water-based thermal barrier coating, which is the same as that of Embodiment 1.

[0078] Embodiment 7

[0079] The present embodiment provides a water-based thermal barrier coating, which is composed of the following components in parts by weight:

[0080] Acrylic resin (ARCHSOL® 8119) 35 parts, aerogel filler (KNF-W) 5 parts, glass microbeads (GS20) 17 parts, dispersing agent (KERPERDISP® -6600) 2.5 parts, titanium white (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, thickening agent (A406) 0.1 parts, silane coupling agent (USi-1302) 0.2 parts, water 10 parts.

[0081] The present embodiment also provides a preparation method of the water-based thermal barrier coating, which is the same as that of Embodiment 1.

[0082] Embodiment 8

[0083] The present embodiment provides a water-based thermal barrier coating, which is composed of the following components in parts by weight:

[0084] acrylic resin (ARCHSOL® 8119) 35 parts, aerogel filler (KNF-W) 2 parts, glass microbeads (GS20) 17 parts, dispersant (KERPER DISP® -6600) 2.5 parts, titanium white (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, thickening agent (A406) 0.1 parts, silane coupling agent (USi-1302) 0.2 parts, and water 10 parts.

[0085] The present embodiment also provides a preparation method of the water-based thermal barrier coating, which is the same as that of Embodiment 1.

[0086] Embodiment 9

[0087] The present embodiment provides a water-based thermal barrier coating, which is composed of the following components in parts by weight:

[0088] acrylic resin (ARCHSOL® 8119) 35 parts, aerogel filler (KNF-W) 2 parts, glass microbeads (GS20) 17 parts, dispersant (KERPER DISP® -6600) 2.5 parts, titanium white (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, thickening agent (A406) 0.1 parts, silane coupling agent (USi-1302) 0.2 parts, and water 10 parts.

[0089] The present embodiment also provides a preparation method of the water-based thermal barrier coating, which is the same as that of Embodiment 1.

[0090] Embodiment 10

[0091] The present embodiment provides a water-based thermal barrier coating, which is composed of the following components in parts by weight:

[0092] Acrylic resin (ARCHSOL® 8119) 35 parts, aerogel filler (KNF-W) 8 parts, glass microbeads (GS20) 17 parts, dispersing agent (KERPERDISP® -6600) 2.5 parts, titanium white (R215) 5 parts, defoaming agent (SGR1940) 0.3 parts, film forming aid (TEXANOL) 2 parts, anti-freezing agent 0.2 parts, bactericide (GY-KS3) 0.3 parts, thickening agent (A406) 0.1 parts, silane coupling agent (USi-1302) 0.2 parts, water 10 parts.

[0093] This embodiment also provides a preparation method of the water-based thermal insulation coating, which is the same as that in Embodiment 1.

[0094] Embodiment 11

[0095] This embodiment provides a water-based thermal insulation coating, which is composed of the following components in parts by weight:

[0096] Acrylic resin (ARCHSOL® 8119) 35 parts, aerogel filler (KNF-W) 5 parts, glass microbeads (GS20) 5.3 parts, glass microbeads (GS40) 9.5 parts, phase change microcapsule (MPCM25) 5.2 parts, dispersing agent (KERPERDISP® -6600) 2.5 parts, titanium white (R215) 5 parts, defoaming agent (SGR1940) 0.3 parts, film forming aid (TEXANOL) 2 parts, anti-freezing agent 0.2 parts, bactericide (GY-KS3) 0.3 parts, thickening agent (A406) 0.1 parts, silane coupling agent (USi-1302) 0.2 parts, water 10 parts.

[0097] This embodiment also provides a preparation method of the water-based thermal insulation coating, which is the same as that in Embodiment 1.

[0098] Embodiment 12

[0099] This embodiment provides a water-based thermal insulation coating, which is composed of the following components in parts by weight:

[0100] Acrylic resin (ARCHSOL® 8119) 35 parts, aerogel filler (KNF-W) 5 parts, glass microbeads (GS20) 5 parts, glass microbeads (GS40) 10 parts, phase change microcapsule (MPCM25) 5 parts, dispersing agent (KERPERDISP® -6600) 2.5 parts, titanium white (R215) 5 parts, defoaming agent (SGR1940) 0.3 parts, film forming aid (TEXANOL) 2 parts, anti-freezing agent 0.2 parts, bactericide (GY-KS3) 0.3 parts, thickening agent (A406) 0.1 parts, silane coupling agent (USi-1302) 0.2 parts, water 10 parts.

[0101] The present embodiment also provides a preparation method of the water-based thermal insulation coating, which is the same as that in Embodiment 1.

[0102] Embodiment 13

[0103] The present embodiment provides a water-based thermal insulation coating, which is composed of the following components in parts by weight:

[0104] acrylic resin (ARCHSOL® 8119) 35 parts, aerogel filler (KNF-W) 5 parts, glass microbead (GS20) 5.3 parts, glass microbead (GS40) 10.5 parts, phase change microcapsule (MPCM25) 4.2 parts, dispersant (KERPER DISP®-6600) 2.5 parts, titanium white (R215) 5 parts, defoaming agent (SGR1940) 0.3 parts, film-forming aid (TEXANOL) 2 parts, antifreezing agent 0.2 parts, bactericide (GY-KS3) 0.3 parts, thickening agent (A406) 0.1 parts, silane coupling agent (USi-1302) 0.2 parts, and water 10 parts.

[0105] The present embodiment also provides a preparation method of the water-based thermal insulation coating, which is the same as that in Embodiment 1.

[0106] Embodiment 14

[0107] The present embodiment provides a water-based thermal insulation coating, which is composed of the following components in parts by weight:

[0108] acrylic resin (ARCHSOL® 8119) 35 parts, aerogel filler (KNF-W) 5 parts, glass microbead (GS20) 5.3 parts, glass microbead (GS40) 10.5 parts, phase change microcapsule (MPCM25) 4.2 parts, dispersant (KERPER DISP®-6600) 2.5 parts, titanium white (R215) 5 parts, defoaming agent (SGR1940) 0.3 parts, film-forming aid (TEXANOL) 2 parts, antifreezing agent 0.2 parts, bactericide (GY-KS3) 0.3 parts, thickening agent (A406) 0.1 parts, silane coupling agent (USi-1302) 0.2 parts, and water 10 parts.

[0109] The present embodiment also provides a preparation method of the water-based thermal insulation coating, which is the same as that in Embodiment 1.

[0110] Embodiment 15

[0111] The present embodiment provides a water-based thermal insulation coating, which is composed of the following components in parts by weight:

[0112] Acrylic resin (ARCHSOL® 8119) 35 parts, aerogel filler (KNF-W) 5 parts, glass microbead (GS20) 6.7 parts, glass microbead (GS40) 6.7 parts, phase change microcapsule (MPCM25) 6.7 parts, dispersant (KERPER DISP® -6600) 2.5 parts, titanium white (R215) 5 parts, defoaming agent (SGR1940) 0.3 parts, film forming aid (TEXANOL) 2 parts, antifreezing agent 0.2 parts, bactericide (GY-KS3) 0.3 parts, thickening agent (A406) 0.1 parts, silane coupling agent (USi-1302) 0.2 parts, water 10 parts.

[0113] This embodiment also provides a preparation method of the water-based thermal insulation coating, which is the same as that in Embodiment 1.

[0114] Embodiment 16

[0115] This embodiment provides a water-based thermal insulation coating, which is composed of the following components in parts by weight:

[0116] Acrylic resin (ARCHSOL® 8119) 35 parts, aerogel filler (KNF-W) 5 parts, glass microbead (GS20) 6.7 parts, glass microbead (GS40) 6.7 parts, phase change microcapsule (MPCM25) 6.7 parts, dispersant (KERPER DISP® -6600) 2.5 parts, titanium white (R215) 5 parts, defoaming agent (SGR1940) 0.3 parts, film forming aid (TEXANOL) 2 parts, antifreezing agent 0.2 parts, bactericide (GY-KS3) 0.3 parts, thickening agent (A406) 0.1 parts, silane coupling agent (USi-1302) 0.2 parts, water 10 parts.

[0117] This embodiment also provides a preparation method of the water-based thermal insulation coating, which is the same as that in Embodiment 1.

[0118] Embodiment 17

[0119] This embodiment provides a water-based thermal insulation coating, which is composed of the following components in parts by weight:

[0120] Acrylic resin (ARCHSOL® 8119) 35 parts, aerogel filler (KNF-W) 5 parts, glass microbead (GS20) 6.7 parts, glass microbead (GS40) 6.7 parts, phase change microcapsule (MPCM25) 6.7 parts, dispersant (KERPER DISP® -6600) 2.5 parts, titanium white (R215) 5 parts, defoaming agent (SGR1940) 0.3 parts, film forming aid (TEXANOL) 2 parts, antifreezing agent 0.2 parts, bactericide (GY-KS3) 0.3 parts, thickening agent (A406) 0.1 parts, silane coupling agent (USi-1302) 0.2 parts, water 10 parts.

[0121] The present example also provides a preparation method of the water-based thermal insulation coating, which is the same as that of Example 1.

[0122] Example 18

[0123] The present example provides a water-based thermal insulation coating, which is composed of the following components in parts by weight:

[0124] Acrylic resin (ARCHSOL® 8119) 35 parts, aerogel filler (KNF-W) 5 parts, glass microbeads (GS40) 5 parts, glass microbeads (C25) 10 parts, phase change microcapsule (MPCM25) 5 parts, dispersant (KERPERDISP® -6600) 2.5 parts, titanium white (R215) 5 parts, defoaming agent (SGR1940) 0.3 parts, film-forming aid (TEXANOL) 2 parts, antifreeze 0.2 parts, bactericide (GY-KS3) 0.3 parts, thickening agent (A406) 0.1 parts, silane coupling agent (USi-1302) 0.2 parts, and water 10 parts.

[0125] The present example also provides a preparation method of the water-based thermal insulation coating, which is the same as that of Example 1.

[0126] Example 19

[0127] The present example provides a water-based thermal insulation coating, which is composed of the following components in parts by weight:

[0128] Acrylic resin (ARCHSOL® 8119) 35 parts, aerogel filler (KNF-W) 5 parts, glass microbeads (GS20) 5 parts, glass microbeads (GS40) 10 parts, phase change microcapsule (PCM-BM-35) 5 parts, dispersant (KERPERDISP® -6600) 2.5 parts, titanium white (R215) 5 parts, defoaming agent (SGR1940) 0.3 parts, film-forming aid (TEXANOL) 2 parts, antifreeze 0.2 parts, bactericide (GY-KS3) 0.3 parts, thickening agent (A406) 0.1 parts, silane coupling agent (USi-1302) 0.2 parts, and water 10 parts.

[0129] In the present example, the type of phase change microcapsule is changed to PCM-BM-35, and the other components are the same as those of Example 12.

[0130] The present example also provides a preparation method of the water-based thermal insulation coating, which is the same as that of Example 1.

[0131] Comparative Example 1

[0132] The present comparative example provides a water-based thermal insulation coating, which is composed of the following components in parts by weight:

[0133] Acrylic resin (BLJ-KD96) 35 parts, aerogel filler (KNF-W) 5 parts, glass microbead (GS20) 20 parts, dispersing agent (KERPER DISP®-6600) 2.5 parts, titanium white (R215) 5 parts, defoaming agent (SGR1940) 0.3 parts, film forming aid (TEXANOL) 2 parts, antifreezing agent 0.2 parts, bactericide (GY-KS3) 0.3 parts, thickening agent (A406) 0.1 parts, silane coupling agent (USi-1302) 0.2 parts, water 10 parts.

[0134] In the present comparative example, the acrylic resin model is replaced by BLJ-KD96, and the other components are consistent with Example 3.

[0135] The present 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.

[0136] Comparative Example 2

[0137] The present comparative example provides a water-based thermal insulation coating, which is composed of the following components in parts by weight:

[0138] Acrylic resin (YC-8360) 35 parts, aerogel filler (KNF-W) 5 parts, glass microbead (GS20) 20 parts, dispersing agent (KERPER DISP®-6600) 2.5 parts, titanium white (R215) 5 parts, defoaming agent (SGR1940) 0.3 parts, film forming aid (TEXANOL) 2 parts, antifreezing agent 0.2 parts, bactericide (GY-KS3) 0.3 parts, thickening agent (A406) 0.1 parts, silane coupling agent (USi-1302) 0.2 parts, water 10 parts.

[0139] In the present comparative example, the acrylic resin model is replaced by YC-8360, and the other components are consistent with Example 3.

[0140] The present 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.

[0141] Comparative Example 3

[0142] The present comparative example provides a water-based thermal insulation coating, which is composed of the following components in parts by weight:

[0143] Acrylic resin (ARCHSOL® 8119) 15 parts, aerogel filler (KNF-W) 5 parts, glass microbeads (GS20) 20 parts, dispersing agent (KERPERDISP® -6600) 2.5 parts, titanium white (R215) 5 parts, defoaming agent (SGR1940) 0.3 parts, film forming aid (TEXANOL) 2 parts, antifreezing agent 0.2 parts, bactericide (GY-KS3) 0.3 parts, thickening agent (A406) 0.1 parts, silane coupling agent (USi-1302) 0.2 parts, water 10 parts.

[0144] In the present comparative example, the amount of acrylic resin is reduced to 15 parts, and the other components are the same as in Example 3.

[0145] The present comparative example also provides a preparation method of the water-based thermal insulation coating, which is the same as in Example 1.

[0146] Comparative Example 4

[0147] The present comparative example provides a water-based thermal insulation coating, which is composed of the following components in parts by weight:

[0148] Acrylic resin (ARCHSOL® 8119) 55 parts, aerogel filler (KNF-W) 5 parts, glass microbeads (GS20) 20 parts, dispersing agent (KERPERDISP® -6600) 2.5 parts, titanium white (R215) 5 parts, defoaming agent (SGR1940) 0.3 parts, film forming aid (TEXANOL) 2 parts, antifreezing agent 0.2 parts, bactericide (GY-KS3) 0.3 parts, thickening agent (A406) 0.1 parts, silane coupling agent (USi-1302) 0.2 parts, water 10 parts.

[0149] In the present comparative example, the amount of acrylic resin is increased to 55 parts, and the other components are the same as in Example 3.

[0150] The present comparative example also provides a preparation method of the water-based thermal insulation coating, which is the same as in Example 1.

[0151] Comparative Example 5

[0152] The present comparative example provides a water-based thermal insulation coating, which is composed of the following components in parts by weight:

[0153] Acrylic resin (ARCHSOL® 8119) 35 parts, aerogel filler (KNF-W) 5 parts, glass microbeads (GS20) 5 parts, ceramic microbeads (DGH-T) 10 parts, phase change microcapsules (MPCM25) 5 parts, dispersant (KERPERDISP® -6600) 2.5 parts, titanium white (R215) 5 parts, defoamer (SGR1940) 0.3 parts, film forming aid (TEXANOL) 2 parts, antifreeze 0.2 parts, fungicide (GY-KS3) 0.3 parts, thickening agent (A406) 0.1 parts, silane coupling agent (USi-1302) 0.2 parts, water 10 parts.

[0154] In the present comparative example, the glass microbeads (GS40) are replaced by ceramic microbeads (DGH-T), and the remaining components are consistent with Example 12.

[0155] The present comparative example also provides a preparation method of the water-based thermal insulation coating, which is the same as that of Example 1.

[0156] The thermal conductivity is the main indicator of the thermal insulation performance of the coating, and the instrument used in the present application is a thermal conductivity instrument of HFM 446 type thermal flow method of Germany Nicer Shanghai Company. The thermal insulation coating is coated into a 30×30×1cm coating plate, the cold plate is set to 15℃, the hot plate is set to 35℃, and the thermal conductivity is measured at room temperature. Therefore, the present application is tested according to the actual application scene, and the unexplained is detected under the standard environment of room temperature 23℃.

[0157] Container state: detected according to 6.11 in T / CECS 10126-2021 "aerogel thermal insulation thick coating system".

[0158] Workability: detected according to 6.12 in T / CECS 10126-2021 "aerogel thermal insulation thick coating system".

[0159] 48h water resistance: detected according to 6.16 in T / CECS 10126-2021 "aerogel thermal insulation thick coating system".

[0160] Appearance after drying: detected according to 6.13 in T / CECS 10126-2021 "aerogel thermal insulation thick coating system".

[0161] Flexibility test: detected according to 6.14 in T / CECS 10126-2021 "aerogel thermal insulation thick coating system".

[0162] The test results are listed in Table 1 below:

[0163] Table 1

[0164]

[0165] As can be seen from the experimental data in Table 1, the water-based thermal insulation coating prepared by the present application has excellent thermal insulation performance, with a thermal conductivity of 0.0301 to 0.0731 W / (m·K), which is much lower than the thermal conductivity range of traditional building thermal insulation materials, significantly reducing heat transfer. The coatings of each embodiment are uniform in the container, have good construction performance, no abnormality in 48-hour water resistance test, normal appearance after drying and good flexibility, without cracking, peeling or blistering. The thermal conductivity of Example 12 is the lowest, reaching 0.0301 W / (m·K).

[0166] As can be seen from the test results of Examples 1-10, the thermal conductivity of the water-based thermal insulation coating obtained by coating 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 coating obtained by coating Examples 1-2, Example 6, Example 8, and Example 10 is 0.0514-0.0731 W / (m·K) (>0.05 W / (m·K)). It shows that by further controlling the weight parts of the acrylic resin, aerogel filler and glass microbeads in the water-based thermal insulation coating within a specific range, a better synergistic effect between these raw materials can be formed, and the thermal insulation performance of the obtained water-based thermal insulation coating is better.

[0167] The comparison results of Example 3 and Comparative Examples 1-4 show that when the ARCHSOL® 8119 type acrylic resin is used and its amount is controlled within the range of 25-45 parts (such as Example 3), the water-based thermal insulation coating prepared has significantly excellent thermal insulation performance, with a thermal conductivity as low as 0.0325 W / (m·K), and the comprehensive physical properties of the coating (water resistance, flexibility, dry appearance, etc.) perform well, without cracking, peeling or blistering. While Comparative Examples 1 and 2 use different types of acrylic resins (BLJ-KD96 and YC-8360), Comparative Example 3 uses an insufficient amount of acrylic resin (15 parts), and Comparative Example 4 uses an excessive amount of acrylic resin (55 parts), resulting in a thermal conductivity of 0.0828 W / (m·K), 0.0746 W / (m·K), 0.0795 W / (m·K) and 0.0844 W / (m·K), respectively, and some of the comparative examples have problems such as coating cracking, peeling or blistering. This shows that by selecting a specific type of acrylic resin and precisely controlling its amount, the thermal insulation performance and physical stability of the coating can be significantly improved.

[0168] The comparison results of Example 12 and Comparative Example 5 show that: Example 12 uses glass beads (GS20 and GS40) and phase change microcapsules (MPCM25) of specific specifications and amounts for compounding, and the thermal conductivity is as low as 0.0301 W / (m·K), which exhibits excellent thermal insulation performance. At the same time, the comprehensive physical properties (water resistance, flexibility, dry appearance, etc.) of the coating are good, and there is no cracking, peeling or blistering phenomenon. However, after replacing part of the glass beads with ceramic beads in Comparative Example 5, the thermal conductivity increases significantly to 0.0851 W / (m·K), and the thermal insulation performance decreases significantly. This shows that the use of glass beads of specific specifications and amounts, and the reasonable compounding with phase change microcapsules can significantly improve the thermal insulation performance of the coating, while the use of ceramic beads cannot achieve the same effect.

[0169] The comparison results of Example 3, Examples 11-16 show that: Example 3 only uses a single type of glass beads, and the thermal conductivity is 0.0325 W / (m·K). However, when Examples 11-16 use GS20 and GS40 glass beads of two different specifications and phase change microcapsules (MPCM25) for compounding, and the weight ratio of the three is optimized to the 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), which exhibits more excellent thermal insulation performance. The comparison between Example 12 and Examples 17-19 shows that: Example 12 uses GS20 and GS40 glass beads with phase change microcapsules MPCM25, and the thermal conductivity is 0.0301 W / (m·K), which has excellent comprehensive performance. After replacing part of the GS40 beads or GS20 beads with C25 in Examples 17 and 18, the thermal conductivity increases to 0.0424 W / (m·K) and 0.0437 W / (m·K), respectively, and the thermal insulation performance decreases. Example 19 uses phase change microcapsules PCM-BM-35, and the thermal conductivity increases to 0.0662 W / (m·K), which highlights the superiority of the type, ratio and phase change microcapsule model in Example 12. This shows that the reasonable compounding of glass beads of different specifications and phase change microcapsules can significantly improve the thermal insulation effect of the coating, and proves the advantages of multi-component synergistic effect. At the same time, the comprehensive physical properties of all examples are good, and there is no cracking, peeling or blistering phenomenon.

[0170] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A water-based heat-insulating coating, characterized in that, The raw materials include the following parts by weight: 9.5-10.5 parts water, 25-45 parts acrylic resin, 3-8 parts titanium dioxide, 14-23 parts glass microspheres, 4.5-6.5 parts aerogel filler, 4-7 parts phase change microcapsules, 3-10 parts functional additives, and 0.15-0.35 parts silane coupling agent. The acrylic resin is an anionic styrene-acrylic resin; the acrylic resin has a 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℃, and a minimum film-forming temperature of 25-30℃. The glass microspheres include a first glass microsphere and a second glass microsphere, wherein the true density of the first glass microsphere is 0.18-0.22 g / cm³. 3 The particle size D50 is 55-65 μm, the compressive strength is 3-4 MPa, and the thermal conductivity at 20℃ is 0.03-0.045 W·m. -1 ·K -1 The true density of the second glass microsphere is 0.38-0.42 g / cm³. 3 The particle size D50 is 45-55 μm, the compressive strength is 25-30 MPa, and the thermal conductivity at 20℃ is 0.05-0.06 W·m. -1 ·K -1 ; The weight ratio of the first glass microsphere, the second glass microsphere, and the phase change microcapsule is (4.8-6.7):(6.7-11):(4.2-6.7).

2. The water-based heat-insulating coating according to claim 1, characterized in that, The phase transition temperature of the phase change microcapsules is 20-40℃.

3. The water-based heat-insulating coating according to claim 2, characterized in that, The phase change microcapsules have a phase change temperature of 20-30℃, a shell material of melamine urea-formaldehyde resin, a core material of biomass phase change wax, and a particle size of 1-2μm.

4. The water-based heat-insulating coating according to claim 1, characterized in that, The raw materials include the following 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.

5. The water-based heat-insulating coating according to any one of claims 1-4, characterized in that, The specific surface area of ​​the aerogel filler is 400-700 m². 2 / g, porosity >90%, pore size 10-20nm, bulk density 60-120kg / m³ 3 It has a hydrophobic angle > 145° and a thermal conductivity of 0.017-0.023 W / (m∙K).

6. The water-based heat-insulating coating according to any one of claims 1-4, characterized in that, The functional additives include one or more of the following: film-forming aids, antifreeze agents, dispersants, defoamers, bactericides, and thickeners.

7. The water-based heat-insulating coating according to claim 6, characterized in that, The dispersant is selected from one or more of polycarboxylate dispersants, modified polyurethane dispersants, and naphthalene sulfonate dispersants; And / or, the defoamer is selected from one or more of silicone defoamers, polyether defoamers, and mineral oil defoamers; And / or, the antifreeze is selected from one or more of ethylene glycol, propylene glycol, and glycerin; And / or, the thickener is selected from one or more of inorganic thickeners, cellulose thickeners, polyacrylate thickeners and polyurethane thickeners; 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.

8. The water-based heat-insulating coating according to claim 7, characterized in that, The dispersant is a modified polyurethane dispersant.

9. The water-based heat-insulating coating according to claim 7, characterized in that, The defoamer is a polyether-based defoamer.

10. The water-based heat-insulating coating according to claim 7, characterized in that, The thickener is a polyurethane thickener.

11. The water-based heat-insulating coating according to claim 7, characterized in that, The film-forming aid is an alcohol ester-based film-forming aid.

12. The water-based heat-insulating coating according to claim 6, characterized in that, The raw materials include the following parts by weight: 9.5-10.5 parts water, 2-3 parts dispersant, 0.2-0.4 parts defoamer, 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, 1.5-2.5 parts film-forming aid, 0.1-0.3 parts antifreeze, 0.2-0.4 parts bactericide, 0.05-0.15 parts thickener, and 0.15-0.25 parts silane coupling agent.

13. The method for preparing the water-based heat-insulating coating according to any one of claims 1-12, characterized in that, Includes the following steps: (1) First, mix acrylic resin, aerogel filler, functional additives, titanium dioxide, silane coupling agent and water to form a base coating; (2) Then add the glass microspheres to the base coating and mix.

14. The method for preparing the water-based heat-insulating coating according to claim 13, characterized in that, 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.

15. The application of the water-based thermal insulation coating according to any one of claims 1-12 in thermal insulation and protection of building exterior walls or industrial equipment.

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