Water-based thermal insulation coating as well as preparation method and application thereof

Abstract

The invention discloses a water-based thermal insulation coating as well as a preparation method and application thereof, relates to the technical field of coatings, and solves the problems of lack of thermal insulation and low durability of an existing water-based coating. The water-based thermal insulation coating comprises the following components: 15-25 wt% of a pigment, 35-45 wt% of resin, 15-25 wt% of a solvent and 5-10 wt% of an additive. The rare earth compounds CeO2, Ce2O3 and La2O3 are added into the water-based paint, and the purpose of heat insulation is achieved by utilizing the optical property that the rare earth compounds can effectively reflect sunlight. The water-based heat-insulating coating is applied to preparation of the outer surface and the interior of a passenger car, rising of the temperature in the car can be effectively slowed down, then aging and fading of a car interior material are slowed down, meanwhile, raw materials of the water-based heat-insulating coating are environmentally friendly, the standard of green coatings is met, and the high requirements for the safety and the environmental protection performance of the coating are met.

Description

Technical Field

[0001] The present invention relates to the technical field of coatings, and particularly relates to an aqueous heat-insulating coating, a preparation method thereof, and an application thereof. Background Art

[0002] With the continuous improvement of global environmental awareness, many industries are actively promoting the application of green technologies, especially in the automotive industry. Traditional passenger car coatings generally use solvent-based coatings, but a significant drawback of this type of coating is the relatively high emissions of volatile organic compounds (VOCs) during production and painting processes, which not only have a negative impact on air quality but also exacerbate the greenhouse effect and pose a threat to human health. To reduce the negative impacts of solvent-based coatings during application, more and more researchers and manufacturers have started to turn to the development of aqueous coatings. As an environmentally friendly alternative, aqueous coatings use water as a solvent and contain almost no VOCs, reducing their harm to the human body during painting or use and meeting the requirements for the safety of passenger car coatings; at the same time, aqueous coatings are easy to clean, avoiding the complexity of solvent cleaning and secondary environmental pollution, and meeting the needs of green buildings and sustainable development.

[0003] However, although aqueous coatings have significant advantages in terms of environmental protection, traditional aqueous coatings do not have heat-insulating functions. During the use of passenger cars, there is a phenomenon that the temperature inside the car increases as the outside temperature rises, and the demand for in-car air conditioners has not decreased, still not meeting the requirements for energy conservation and consumption reduction. Therefore, the development of aqueous heat-insulating coatings has become the focus of attention for environmentally friendly coatings, and the application of rare earth metal materials has attracted extensive attention. Rare earth metals are considered key materials for improving the performance of aqueous heat-insulating coatings due to their excellent optical properties, thermal stability, and corrosion resistance. However, a single rare earth metal material usually has a high extraction cost, and the extraction and smelting processes of rare earth metals are usually accompanied by serious impacts on the environment. In actual use, the physical and chemical properties of rare earth metals are special, making them easy to be compatible with other components, resulting in uneven coatings and affecting the coating effect. Therefore, rare earth compounds are introduced as functional fillers to prepare aqueous heat-insulating coatings, retaining the special optical and thermal properties of rare earth elements. In particular, their high infrared reflectivity endows them with heat-insulating properties, increasing their compatibility and stability with coatings on the basis of reducing costs. Therefore, the development of an aqueous heat-insulating coating with excellent heat-insulating performance provides strong support for the sustainable development of the automotive industry. Summary of the Invention

[0004] In order to solve the problems of the lack of heat insulation and low durability of existing aqueous coatings, the present invention provides an aqueous heat-insulating coating, a preparation method thereof, and an application thereof. The technical solution of the present invention is as follows: An aqueous heat-insulating coating, by mass fraction, comprises the following components: 15-25 wt% of pigment, 35-45 wt% of resin, 15-25 wt% of solvent, and 5-10 wt% of additive; The pigment includes CeO 2 , Ce 2 O 3 , La 2 O 3 , SiO 2 , and TiO 2 , and their molar ratio is 200:200:400:1:400; The resin includes aqueous acrylic resin, aqueous alkyd resin, aqueous polyurethane resin, aqueous amino resin HM2608, and aqueous amino resin MF 904, and their mass ratio is 10.256:19.091:14.448:1.754:2.064; The additive includes defoamer SURFYNOL 104E, defoamer 2400, defoamer 21649, leveling agent BYK333, light stabilizer EVERSORB 93, ultraviolet absorber EVERSORB 80, pigment dispersant PF152, silicone surfactant, and aqueous thickener solution 1130, and their mass ratio is 5.16:5.16:29.13:1:8:4:20.40:0.62:3.61; The solvent includes N,N-dimethylethanolamine aqueous solution, ethylene glycol hexyl ether, propylene glycol butyl ether, and ethylene glycol monobutyl ether, and their mass ratio is 0.612-1.754:1.167:1:4.881.

[0005] A preparation method of the above aqueous heat-insulating coating comprises the following steps: S1: Weigh CeO 2 , Ce 2 O 3 , La 2 O 3 , SiO 2 , TiO 2 powders in sequence according to the molar ratio of the above pigment, add them together with pigment dispersant PF152 into deionized water and N,N-dimethylethanolamine aqueous solution, stir to mix them evenly, then add the powder materials into a grinder for grinding, control the grinding temperature and adjust the pH to obtain component A; S2: While stirring, sequentially add waterborne acrylic resin, deionized water, defoamer SURFYNOL 104E, silicone surfactant, N,N-dimethylethanolamine aqueous solution, waterborne alkyd resin, waterborne polyurethane resin, defoamer 2400, ethylene glycol hexyl ether, propylene glycol butyl ether, defoamer 21649, waterborne amino resin HM 2608, waterborne amino resin MF 904, leveling agent BYK333, light stabilizer EVERSORB 93, ultraviolet absorber EVERSORB 80, ethylene glycol monobutyl ether, and waterborne thickener solution 1130, and adjust the viscosity and pH to obtain Component B; S3: While stirring, add Component A to Component B. After mixing evenly, and adjusting the viscosity and pH value, the waterborne heat-insulating coating is obtained; Further, the fineness of the powder grinding in S1 is 10 - 20 μm; Further, the grinding temperature in S1 is 20 - 25 °C; Further, the pH in S1 is adjusted to 9.5 - 10.5; Further, the viscosity in S2 is adjusted to 123 mpa.s; Further, the pH value in S2 is adjusted to 8.3; Further, the viscosity in S3 is adjusted to 93 - 95 mpa.s; Further, the pH value in S3 is adjusted to 8.6.

[0006] The preparation of a passenger car outer surface and interior using the above waterborne heat-insulating coating.

[0007] Compared with the prior art, the present invention solves the problems of the existing waterborne coatings lacking heat insulation and having low durability. The specific beneficial effects are as follows: 1. Significant heat insulation effect: The present invention utilizes the optical properties of rare earth compounds (CeO 2 、Ce 2 O 3 、La 2 O 3 )to reflect sunlight, endowing the waterborne coating with heat insulation performance. Due to its compatibility and stability in the coating, it also effectively improves the mechanical properties and aging properties of the coating, providing an environmentally friendly and efficient solution for full-spectrum heat-insulating car paint. Under natural light, when the waterborne heat-insulating coating prepared by the present invention is sprayed on the steering wheel of a passenger car, the temperature of the steering wheel is 10.9 °C lower than that of the waterborne coating without adding rare earth compounds. It is proved that the application of the waterborne heat-insulating coating can effectively slow down the rise of the interior temperature of the car, reduce the usage frequency and intensity of the air conditioner, reduce the energy consumption of the passenger car, and thus reduce the emission of greenhouse gases, meeting the current environmental protection trend.

[0008] 2. Extend the service life of passenger car interiors: The waterborne heat-insulating car paint achieves the heat-insulating effect by reflecting solar radiation, with a reflectivity of up to 99%. It can effectively slow down the aging and fading of passenger car interior materials, extend their service life, and thus reduce the maintenance costs of car owners.

[0009] 3. Green and environmentally friendly: The raw materials of the waterborne heat-insulating coating are environmentally friendly, can greatly reduce the emissions of VOCs, meet the standards of green coatings, and can meet the high requirements for the safety and environmental protection of coatings. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 Infrared reflectivity diagram of the waterborne heat-insulating car paint prepared in Example 2 and the waterborne car paint prepared in the comparative example; Figure 2 Temperature change diagram of the waterborne heat-insulating coating prepared in Example 2 and the waterborne coating prepared in the comparative example sprayed on the steering wheel of a passenger car; Figure 3 Temperature change diagram of the waterborne heat-insulating coating prepared in Example 2 and the waterborne coating prepared in the comparative example sprayed on the driver's headrest of a passenger car; Figure 4 Temperature change diagram of the waterborne heat-insulating coating prepared in Example 2 and the waterborne coating prepared in the comparative example sprayed on the engine hood of a passenger car; Figure 5 Temperature change diagram of the waterborne heat-insulating coating prepared in Example 2 and the waterborne coating prepared in the comparative example sprayed on the left rear door of a passenger car. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0011] To make the technical solutions of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the present invention. It should be noted that the following embodiments are only for better understanding the technical solutions of the present invention and should not be construed as a limitation of the present invention.

[0012] Example 1. S1: Weigh CeO 2 , Ce 2 O 3 , La 2 O 3 , SiO 2 , TiO 2Powder: Add 17.64 kg of pigments and 2.04 kg of pigment dispersant PF152 to 3.5 kg of deionized water and 10% of 0.612 kg of N,N-dimethylethanolamine aqueous solution, stir, and after mixing evenly, add the powder to a grinder for sufficient grinding. The fineness of the powder is ground to 12 μm, the grinding temperature is 22°C, and the pH is adjusted to 9.8 to obtain Component A; S2: While stirring, sequentially add 10.256 kg of waterborne acrylic resin, 8.256 kg of deionized water, 0.516 kg of defoamer SURFYNOL 104E, 0.062 kg of silicone surfactant, 1.754 kg of 10% N,N-dimethylethanolamine aqueous solution, 19.091 kg of waterborne alkyd resin, 14.448 kg of waterborne polyurethane resin, 0.516 kg of defoamer 2400, 1.167 kg of ethylene glycol hexyl ether, 1 kg of propylene glycol butyl ether, 2.931 kg of defoamer 21649, 1.754 kg of waterborne amino resin HM 2608, 2.064 kg of waterborne amino resin MF 904, 0.1 kg of leveling agent BYK333, 0.8 kg of light stabilizer EVERSORB 93, 0.4 kg of ultraviolet absorber EVERSORB 80, 4.881 kg of ethylene glycol monobutyl ether, and 0.361 kg of waterborne thickener solution 1130. Adjust the viscosity to 123 mpa.s, and add 10% of 1.02 kg of N,N-dimethylethanolamine aqueous solution to adjust the pH value to 8.3 to obtain Component B; S3: While stirring, add 16 kg of Component A mixture to 71.377 kg of Component B mixture, mix evenly, adjust the viscosity to 94.876 mpa.s, and adjust the pH value to 8.6 to obtain the waterborne heat-insulating coating.

[0013] Spray the waterborne white primer on the electrophoretic plate and then perform flash drying. The spray film thickness is 33 μm, the flash drying time is 5 min, pre-bake at 80°C for 10 min, and then bake at 160°C for 20 min; after the waterborne white primer forms a film, spray the waterborne heat-insulating coating prepared in S3 on it. The spray film thickness is 22 μm, the flash drying time is 5 min, and pre-bake at 80°C for 10 min to obtain the waterborne heat-insulating car paint; finally, spray 2K clear coat on the surface of the waterborne heat-insulating car paint. The spray film thickness is 45 μm, the flash drying time is 10 min, and bake at 140°C for 20 min. Use an 800 W infrared quartz heating lamp to irradiate the plate after spraying the coating. When the ambient temperature is 24.6°C and the temperature of the baking lamp is 137.7°C, set the irradiation time to 20 min, and the temperature of the plate is 35.1°C.

[0014] Example 2. S1: The preparation method and conditions of component A are the same as those in S1 of Example 1; S2: The preparation method and conditions of component B are the same as those in S2 of Example 1; S3: Under stirring, add 21 kg of component A mixture to 71.377 kg of component B mixture. After mixing evenly, adjust the viscosity to 93.943 mpa.s and the pH value to 8.6 to obtain the waterborne heat-insulating coating.

[0015] Spray the waterborne white primer on the electrophoresis panel and then perform flash drying. The spray film thickness is 33 μm, the flash drying time is 5 min, pre-bake at 80 °C for 10 min, and then bake at 160 °C for 20 min; after the waterborne white primer forms a film, spray the waterborne heat-insulating coating prepared in S3 on it. The spray film thickness is 22 μm, the flash drying time is 5 min, and pre-bake at 80 °C for 10 min to obtain the waterborne heat-insulating car paint; finally, spray 2K clear coat on the surface of the waterborne heat-insulating car paint. The spray film thickness is 45 μm, the flash drying time is 10 min, and bake at 140 °C for 20 min. Use an 800W infrared quartz heating lamp to perform light treatment on the plate after spraying the coating. When the ambient temperature is 24.6 °C and the temperature of the baking lamp is 137.7 °C, set the light treatment time to 20 min, and the temperature of the plate is 34.4 °C.

[0016] Example 3. S1: The preparation method and conditions of component A are the same as those in S1 of Example 1; S2: The preparation method and conditions of component B are the same as those in S2 of Example 1; S3: Under stirring, add 27 kg of component A mixture to 71.377 kg of component B mixture. After mixing evenly, adjust the viscosity to 94.143 mpa.s and the pH value to 8.6 to obtain the waterborne heat-insulating coating.

[0017] Spray the water-based white primer surfacer on the electrophoresis panel and then perform flash drying. The spray film thickness is 33 μm, the flash drying time is 5 min, pre-bake at 80 °C for 10 min, and then bake at 160 °C for 20 min; after the water-based white primer surfacer forms a film, spray the water-based heat-insulating coating prepared in S3 on it. The spray film thickness is 22 μm, the flash drying time is 5 min, pre-bake at 80 °C for 10 min to obtain the water-based heat-insulating car paint; finally, spray 2K clear coat on the surface of the water-based heat-insulating car paint. The spray film thickness is 45 μm, the flash drying time is 10 min, and bake at 140 °C for 20 min. Use an 800W infrared quartz heating lamp to perform light treatment on the plate after spraying the coating. When the ambient temperature is 24.6 °C and the temperature of the baking lamp is 137.7 °C, when the light treatment time is set to 20 min, the temperature of the plate is 35 °C.

[0018] Example 4. S1: The preparation method and conditions of component A are the same as those in S1 of Example 1; S2: The preparation method and conditions of component B are the same as those in S2 of Example 1; S3: The preparation method and conditions of the water-based heat-insulating coating are the same as those in S3 of Example 2.

[0019] Spray the water-based white primer surfacer on the electrophoresis panel and then perform flash drying. The spray film thickness is 33 μm, the flash drying time is 5 min, pre-bake at 80 °C for 10 min, and then bake at 160 °C for 20 min; after the water-based white primer surfacer forms a film, spray the water-based heat-insulating coating prepared in S3 on it. The spray film thickness is 15 μm, the flash drying time is 5 min, pre-bake at 80 °C for 10 min to obtain the water-based heat-insulating car paint; finally, spray 2K clear coat on the surface of the water-based heat-insulating car paint. The spray film thickness is 45 μm, the flash drying time is 10 min, and bake at 140 °C for 20 min. Use an 800W infrared quartz heating lamp to perform light treatment on the plate after spraying the coating. When the ambient temperature is 24.6 °C and the temperature of the baking lamp is 137.7 °C, when the light treatment time is set to 20 min, the temperature of the plate is 35.5 °C.

[0020] Example 5. S1: The preparation method and conditions of component A are the same as those in S1 of Example 1; S2: The preparation method and conditions of component B are the same as those in S2 of Example 1; S3: The preparation method and conditions of the water-based heat-insulating coating are the same as those in S3 of Example 2.

[0021] Spray the waterborne white primer surfacer on the electrophoresis panel and then flash dry it. The spray film thickness is 33 μm, the flash drying time is 5 min, pre-bake it at 80 °C for 10 min, and then bake it at 160 °C for 20 min; after the waterborne white primer surfacer forms a film, spray the waterborne heat-insulating coating prepared in S3 on it. The spray film thickness is 35 μm, the flash drying time is 5 min, pre-bake it at 80 °C for 10 min to obtain the waterborne heat-insulating car paint; finally, spray 2K clear coat on the surface of the waterborne heat-insulating car paint. The spray film thickness is 45 μm, the flash drying time is 10 min, and bake it at 140 °C for 20 min. Use an 800W infrared quartz heating lamp to irradiate the plate after spraying the coating. When the ambient temperature is 24.6 °C and the temperature of the baking lamp is 137.7 °C, set the irradiation time to 20 min, and the temperature of the plate is 34.3 °C.

[0022] Example 6. S1: Weigh CeO 2 , Ce 2 O 3 , La 2 O 3 , SiO 2 , TiO 2 powders in the molar ratio of 200:200:400:1:400 in sequence. Add a total of 17.64 kg of pigments and 2.04 kg of pigment dispersant PF152 to 3.5 kg of deionized water and 10% of 0.612 kg of N,N-dimethylethanolamine aqueous solution. Stir and mix them evenly, and then add the powder materials into a grinder for sufficient grinding. The fineness of the powder materials is ground to 5 μm, the grinding temperature is 22 °C, and adjust the pH to 9.8 to obtain Component A; S2: The preparation method and conditions of Component B are the same as those in S2 of Example 1; S3: Under the stirring state, add 21 kg of Component A mixture to 71.377 kg of Component B mixture. After mixing evenly, adjust the viscosity to 94.041 mpa.s and adjust the pH value to 8.6 to obtain the waterborne heat-insulating coating.

[0023] Spray the water-based white primer on the electrophoresis plate and then flash dry it. The spraying film thickness is 33 μm, the flash drying time is 5 min, pre-bake it at 80 °C for 10 min, and then bake it at 160 °C for 20 min; after the water-based white primer forms a film, spray the water-based heat-insulating coating prepared in S3 on it. The spraying film thickness is 22 μm, the flash drying time is 5 min, pre-bake it at 80 °C for 10 min to obtain the water-based heat-insulating car paint; finally, spray 2K clear coat on the surface of the water-based heat-insulating car paint. The spraying film thickness is 45 μm, the flash drying time is 10 min, and bake it at 140 °C for 20 min. Use an 800W infrared quartz heating lamp to irradiate the plate after spraying the coating. When the ambient temperature is 24.6 °C and the temperature of the baking lamp is 137.7 °C, set the irradiation time to 20 min, and the temperature of the plate is 35.2 °C.

[0024] Example 7. S1: Weigh CeO 2 , Ce 2 O 3 , La 2 O 3 , SiO 2 , TiO 2 powders in the molar ratio of 200:200:400:1:400 in sequence. Add 17.64 kg of pigments in total and 2.04 kg of pigment dispersant PF152 to 3.5 kg of deionized water and 10% of 0.612 kg of N,N-dimethylethanolamine aqueous solution. Stir and mix them evenly, and then add the powder materials into a grinder for sufficient grinding. The fineness of the powder materials is ground to 20 μm, the grinding temperature is 22 °C, and adjust the pH to 9.8 to obtain Component A; S2: The preparation method and conditions of Component B are the same as those in S2 of Example 1; S3: Under the stirring state, add 21 kg of Component A mixture to 71.377 kg of Component B mixture. After mixing evenly, adjust the viscosity to 94.554 mpa.s and adjust the pH value to 8.6 to obtain the water-based heat-insulating coating.

[0025] Spray the waterborne white primer surfacer on the electrophoresis panel and then flash dry it. The spray film thickness is 33 μm, the flash drying time is 5 min, pre-bake it at 80 °C for 10 min, and then bake it at 160 °C for 20 min; after the waterborne white primer surfacer forms a film, spray the waterborne heat-insulating coating prepared in S3 on it. The spray film thickness is 22 μm, the flash drying time is 5 min, pre-bake it at 80 °C for 10 min to obtain the waterborne heat-insulating car paint; finally, spray 2K clear coat on the surface of the waterborne heat-insulating car paint. The spray film thickness is 45 μm, the flash drying time is 10 min, and bake it at 140 °C for 20 min. Use an 800W infrared quartz heating lamp to irradiate the panel after spraying the coating. When the ambient temperature is 24.6 °C and the temperature of the baking lamp is 137.7 °C, set the irradiation time to 20 min, and the temperature of the panel is 35 °C.

[0026] Comparative example. S1: Add 17.64 kg of TiO 2 powder and 2.04 kg of pigment dispersant PF152 to 3.5 kg of deionized water and 10% of 0.612 kg of N,N-dimethylethanolamine aqueous solution, stir and mix evenly, then add the powder to the grinding machine for sufficient grinding. The fineness of the powder is ground to 12 μm, the grinding temperature is 22 °C, and the pH is adjusted to 9.8 to obtain component A; S2: The preparation method and conditions of component B are the same as those of S2 in Example 1; S3: Under stirring, add 16 kg of component A mixture to 71.377 kg of component B mixture, mix evenly, and adjust the viscosity to 98.331 mpa.s and the pH value to 8.6 to obtain the waterborne coating.

[0027] Spray the waterborne white primer surfacer on the electrophoresis panel and then flash dry it. The spray film thickness is 33 μm, the flash drying time is 5 min, pre-bake it at 80 °C for 10 min, and then bake it at 160 °C for 20 min; after the waterborne white primer surfacer forms a film, spray the waterborne coating prepared in S2 on it. The spray film thickness is 22 μm, the flash drying time is 5 min, pre-bake it at 80 °C for 10 min to obtain the waterborne car paint; finally, spray 2K clear coat on the surface of the waterborne car paint. The spray film thickness is 45 μm, the flash drying time is 10 min, and bake it at 140 °C for 20 min. Use an 800W infrared quartz heating lamp to irradiate the panel after spraying the coating. When the ambient temperature is 24.6 °C and the temperature of the baking lamp is 137.7 °C, set the irradiation time to 20 min, and the temperature of the panel is 39.6 °C.

[0028] As Figure 1Infrared reflectivity diagrams of the waterborne heat-insulating car paint prepared on the sheet in Example 2 and the waterborne car paint prepared in the comparative example. As can be seen from the figure, the reflectivity of the waterborne heat-insulating car paint can reach 99.7%, which is more than 10% higher than that of the ordinary waterborne car paint. This improvement is attributed to the rare earth composite material (CeO 2 、Ce 2 O 3 、La 2 O 3 ), which has excellent optical properties of reflecting sunlight, breaking through the limitation of traditional organic pigments that only work by absorbing ultraviolet light, effectively improving the compatibility and stability of automotive coatings, and providing an environmentally friendly and efficient solution for full-spectrum heat-insulating car paints.

[0029] The waterborne coatings prepared in Examples 1-7 and the comparative example were sprayed into waterborne car paints for quality inspection, and the performance of each item is shown in Table 1. After irradiating the sheet sprayed with the coating with an 800W infrared quartz heating lamp for 20 min, the temperature of the sheet sprayed with the waterborne heat-insulating coating prepared in Example 2 was 5.2 °C lower than that of the sheet in the comparative example. It can be seen that the addition of rare earth compounds CeO 2 、Ce 2 O 3 and La 2 O 3 effectively increased the heat-insulating performance of the coating; although the temperature of the sheet sprayed with the waterborne heat-insulating coating prepared in Example 5 was 5.3 °C lower than that of the sheet in the comparative example, judging from the data, its heat-insulating performance was better than that of the waterborne heat-insulating coating prepared in Example 2, but the sprayed film thickness of the waterborne heat-insulating coating prepared in Example 5 was 35 μm, exceeding the spraying thickness requirement for passenger cars and increasing the preparation cost, so it was not suitable for large-scale application. Therefore, in the following heat-insulating effect experiments of the waterborne heat-insulating coating on the outer surface and interior of passenger cars, the waterborne heat-insulating coating prepared in Example 2 was used.

[0030] Table 1

[0031] Practical application of the waterborne heat-insulating coating on passenger cars: The waterborne heat-insulating coating prepared in Example 2 and the waterborne coating prepared in the comparative example were sprayed on passenger cars of the same specification, and the actual temperatures of the steering wheel, driver's headrest, engine hood and left rear door at ambient temperature were detected. As Figure 2 seen, the temperature of the steering wheel sprayed with the waterborne heat-insulating coating was 10.9 °C lower than that of the steering wheel sprayed with the waterborne coating; the temperature of the driver's headrest sprayed with the waterborne heat-insulating coating was 6.6 °C lower than that of the driver's headrest sprayed with the waterborne coating ( Figure 3 ); the temperature of the engine hood sprayed with the waterborne heat-insulating coating was 8.4 °C lower than that of the engine hood sprayed with the waterborne coating ( Figure 4); The temperature of the left rear door sprayed with the waterborne heat-insulating coating is 6.6 °C lower than that of the left rear door sprayed with the waterborne coating ( Figure 5 ). It can be seen from this that the temperatures of the outer surface and interior of the passenger car using the waterborne heat-insulating coating are both lower than those using the waterborne coating, which proves that the waterborne heat-insulating coating has excellent heat-insulating effect, can effectively protect the aging of parts inside the vehicle body, extend the service life, eliminate the hidden danger of spontaneous combustion of the passenger car, and ensure the safety of vehicle use.

Claims

1. A water-based thermal insulation coating, characterized in that: By mass fraction, it includes the following components: Pigment 15~25 wt%, resin 35~45 wt%, solvent 15~25 wt%, additive 5~10 wt%; The pigment includes CeO2, Ce2O3, La2O3, SiO2 and TiO2, and the molar ratio thereof is 200:200:400:1:400; The resins include water-based acrylic resin, water-based alkyd resin, water-based polyurethane resin, water-based amino resin HM2608 and water-based amino resin MF 904, and the mass ratio thereof is 10.256:19.091:14.448:1.754:2.064; The additives include defoamer SURFYNOL 104E, defoamer 2400, defoamer 21649, leveling agent BYK 333, light stabilizer EVERSORB 93, ultraviolet absorber EVERSORB 80, pigment dispersant PF152, silicone surfactant and aqueous thickener solution 1130, and the mass ratio thereof is 5.16:5.16:29.13:1:8:4:20.40:0.62:3.61; The solvent includes N,N-dimethylethanolamine aqueous solution, ethylene glycol hexyl ether, propylene glycol butyl ether, and ethylene glycol monobutyl ether, and the mass ratio thereof is 0.612-1.754:1.167:1:4.

881.

2. A method for preparing the water-based thermal insulation coating according to claim 1, characterized in that: The following steps are involved: S1: CeO2, Ce2O3, La2O3, SiO2, and TiO2 powders are weighed in sequence according to the molar ratio of the pigments, and added together with the pigment dispersant PF152 into deionized water and N,N-dimethylethanolamine aqueous solution, and stirred to mix them evenly, and then the powders are added into a grinder for grinding, and the grinding temperature is controlled and the pH is adjusted to obtain component A; S2: adding water-based acrylic resin, deionized water, defoamer SURFYNOL 104E, silicone surfactant, N,N-dimethylethanolamine aqueous solution, water-based alkyd resin, water-based polyurethane resin, defoamer 2400, ethylene glycol hexyl ether, propylene glycol butyl ether, defoamer 21649, water-based amino resin HM 2608, water-based amino resin MF 904, leveling agent BYK333, light stabilizer EVERSORB 93, ultraviolet absorber EVERSORB 80, ethylene glycol monobutyl ether and water-based thickener solution 1130 in sequence under stirring, adjusting viscosity and pH to obtain component B; S3: Under stirring, add component A to component B, mix evenly, and adjust the viscosity and pH value to obtain a water-based thermal insulation coating.

3. The method for preparing the water-based thermal insulation coating according to claim 2, characterized in that: The powder in S1 is ground to a fineness of 10-20 μm.

4. The method for preparing the water-based thermal insulation coating according to claim 2, characterized in that: The grinding temperature in S1 is 20-25°C.

5. The method for preparing the water-based thermal insulation coating according to claim 2, characterized in that: The pH in the S1 is adjusted to 9.5-10.

5.

6. The method for preparing the water-based thermal insulation coating according to claim 2, characterized in that: The viscosity of S2 was adjusted to 123 mpa.s.

7. The method for preparing the water-based thermal insulation coating according to claim 2, characterized in that: The pH value in the S2 was adjusted to 8.

3.

8. The method for preparing the water-based thermal insulation coating according to claim 2, characterized in that: The viscosity of S3 is adjusted to 93-95 mpa.s.

9. The method for preparing the water-based thermal insulation coating according to claim 2, characterized in that: The pH value in S3 was adjusted to 8.

6.

10. An application of the water-based thermal insulation coating according to claim 1 or the water-based thermal insulation coating prepared by the preparation method according to any one of claims 2 to 9, characterized in that: Used in the preparation of exterior surfaces and interior decoration of passenger cars.

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