Intelligent building coating capable of preparing film with temperature discoloration response and radiation refrigeration functions and preparation method of intelligent building coating

Abstract

The invention relates to an intelligent building coating capable of preparing a film with temperature discoloration response and radiation refrigeration functions and a preparation method of the intelligent building coating. Intelligent discoloration of the appearance of a building, visual judgment of the temperature of the building and reduction of the refrigeration energy consumption of the building are achieved. The coating disclosed by the invention is prepared from the following components in percentage by mass: 5 to 15 weight percent of montmorillonite, 5 to 15 weight percent of silicon oxide microspheres, 5 to 15 weight percent of silver tetraiodo-mercurate, 10 to 30 weight percent of polymer with transparent visible spectrum or high infrared emission spectrum emission, 0 to 5 weight percent of functional additive and 30 to 50 weight percent of solvent. The reflectivity of the radiation refrigeration function layer in a solar spectrum waveband area is larger than or equal to 0.87, the emissivity of the radiation refrigeration function layer in the 8-12-micron waveband of an atmospheric window is larger than or equal to 0.81, the refrigeration efficiency under the direct solar radiation condition is larger than or equal to 80 W / m < 2 >, and the film is light yellow and reddish brown at the temperature of 50 DEG C or below so that visual judgment of the building temperature can be achieved. The preparation method provided by the invention is simple in process, the refrigeration energy consumption of the building can be effectively reduced, the building is endowed with good aesthetic characteristics, and the energy efficiency and living suitability of the building can be improved.

Description

Technical Field

[0001] The invention relates to the field of green building coatings, and in particular to an intelligent building coating capable of preparing a temperature-changing color response and radiation refrigeration functional film and a preparation method thereof. Background Art

[0002] Benefiting from the good environmental protection and zero energy consumption characteristics of radiant cooling, it has good application prospects in high temperature seasons such as summer and in working conditions such as buildings with high heat dissipation requirements. At present, several building exterior wall coatings with radiant cooling functions have been reported (CN116640486A, CN110896639A), but the related coatings have the following problems: (1) the need to add expensive sunlight reflective materials such as silver and nano-titanium dioxide, which is high in cost (CN108250873A, CN115353779A), (2) single color (CN116042024A, CN115651470A, CN115785809A) and (3) the prepared functional film does not have the characteristics of intelligent response to temperature changes (such as the color changes with temperature or humidity).

[0003] Architectural coatings with a temperature-changing color response mechanism can simultaneously give buildings intelligent information characteristics and good architectural aesthetics (CN115991947A, CN111087887A, CN103048674A), thereby improving the living comfort of the building. Although vanadium dioxide-based radiant cooling architectural coatings have the characteristic of changing their own infrared emissivity with temperature changes (CN114367250A, CN114133826A, CN114702850A), their color does not change significantly in the visible light band, and their dark brown color characteristics are not conducive to the building's good aesthetic characteristics. At present, there are no reports on architectural coatings that can prepare radiant cooling functional films with temperature-changing color responses in the visible light band. Summary of the invention

[0004] The purpose of the present invention is to solve the problems that the existing coatings are high in cost and the radiation cooling films prepared therefrom do not have the characteristics of temperature color change response in the visible light band. An intelligent building coating and a preparation method thereof are proposed that can be used to prepare temperature color change response and radiation cooling functional films, which can effectively reduce the building refrigeration energy consumption and give the building intelligence and good aesthetic characteristics, thereby improving the building energy efficiency and living suitability.

[0005] To achieve the above objectives, the present invention provides an intelligent building coating that can be used to prepare a color-developing temperature-indicating and radiation-cooling functional film.

[0006] The coating of the present invention is prepared from the following components in mass fraction ratio: 5-15 wt% of montmorillonite, 5-15 wt% of silicon oxide microspheres, 5-15 wt% of silver tetraiodomercurate, 10-30 wt% of a polymer transparent in the visible spectrum or emitting in the high infrared spectrum, 0-5 wt% of a functional additive, and 30-50 wt% of a solvent.

[0007] Preferably, the montmorillonite component has a particle size of 100 nm to 1000 nm.

[0008] Preferably, the silicon oxide is spherical particles with a particle size of 100 nm to 5000 nm.

[0009] Preferably, the spectrally transparent or high infrared emitting polymer is polymethylpentene (TPX) or polydimethylsiloxane (PDMS).

[0010] Preferably, the silver tetraiodomercurate is in the form of nanopowder, prepared by chemical precipitation method, and has a particle size of 100 nm to 500 nm.

[0011] Preferably, the functional additive is one or any combination of two or more of a film-forming aid, a defoaming agent, a surfactant, an antifreeze agent or a bactericide.

[0012] Preferably, the solvent is n-hexane or cyclohexane.

[0013] The architectural coating described in this patent is prepared according to the following steps: S1. The montmorillonite, silver tetraiodine mercuryate, and silica microspheres are dispersed in a solvent using ultrasound and stirring in a certain proportion to obtain a solution A; S2. dispersing polymethylpentene (TPX), polydimethylsiloxane or a composite of the two into a solvent by using ultrasound and stirring to obtain a solution B; S3. After solution A and solution B are mixed in a certain proportion, a certain proportion of functional additives are added, and a uniform solution is obtained by means of ultrasound and stirring, which is the smart building coating described in this patent.

[0014] The method for preparing a temperature-changing color response and radiation cooling functional film using architectural coatings described in this patent includes scraping, brushing, and spraying techniques, and the preparation technology includes the following steps: S4. Use a spray gun to spray 75% alcohol solution in sequence to remove dust, grease and other impurities on the surface of the substrate, and then use an air gun to blow dry the substrate to obtain a clean substrate; S5. Spray a layer of diluted liquid double-sided glue on the clean substrate surface to form an intermediate bonding layer after drying; S6. The coating of the present invention is applied by scraping, brushing or spraying on the surface of the intermediate bonding layer, and after drying, a film having a temperature-changing color response and a radiation cooling function that is strongly bonded to the substrate is obtained.

[0015] Preferably, the substrate of the present invention includes building exterior wall materials such as metal plate substrate, glass substrate, marble substrate, waterproof mortar coating, and tile substrate.

[0016] Compared with the disclosed prior art, the present invention has the following beneficial effects: The radiation cooling functional layer of the present invention has a reflectivity of ≥0.87 in the solar spectrum band, an emissivity of ≥0.81 in the 8-12 μm band of the atmospheric window, and a cooling efficiency of ≥80 W / m under direct sunlight. 2 , the film is light yellow and reddish brown respectively around 50°C, so that the building temperature can be visually judged. The preparation method provided by the present invention has a simple process, can effectively reduce the cooling energy consumption of the building, and can give the building good aesthetic characteristics, thereby improving the building energy efficiency and living suitability. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 . Microscopic scanning electron microscope image of the temperature color response and radiation cooling functional film in Example 1.

[0018] Figure 2 . Color comparison of the temperature color response and radiation cooling functional film in Example 1 before and after 50°C.

[0019] Figure 3 . Comparison of the reflectivity of the solar spectrum band of the temperature color change response and radiation cooling functional film in Example 1 before and after 50°C.

[0020] Figure 4 . Comparison of infrared emissivity of the atmospheric window of the temperature color change response and radiation cooling functional film in Example 1 before and after 50 ℃.

[0021] Figure 5 . Comparison of infrared emissivity of the atmospheric window of the temperature color change response and radiation cooling functional film in Example 2 before and after 50°C. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the embodiments of the present invention. The described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] In the following embodiments and comparative examples, the diluted liquid glue is a transparent polyacrylate glue, and the chemical composition is 20-40 wt % polyvinyl alcohol, 10 wt % polyethylene glycol, 5 wt % stabilizer and 45-65 wt % water.

[0024] [Example 1]

[0025] A coating for preparing a temperature-changing color response and radiation cooling functional film consists of the following ingredients: 7 wt% of montmorillonite, 7 wt% of silicon oxide microspheres, 10 wt% of silver tetraiodomercurate, 28 wt% of polydimethylsiloxane with high infrared emission spectrum emissivity, 3 wt% of propylene glycol functional additive, and 45 wt% of n-hexane solvent.

[0026] The process of preparing the coating is: S31 7 wt% montmorillonite, 7 wt% silica microspheres, 10 wt% silver tetraiodomercurate were dispersed in 25 wt% n-hexane solvent by ultrasonic and stirring to obtain a solution A; S32. 28 wt% polydimethylsiloxane was dispersed in 20 wt% n-hexane solvent by ultrasound and stirring to obtain a solution B; S33. After solution A and solution B are mixed in a certain proportion, 3 wt % of propylene glycol functional additive is added, and a uniform solution is obtained by ultrasound and stirring, which is the smart building coating described in this patent.

[0027] The process of using coatings to prepare temperature-changing color response and radiation cooling functional films is as follows: S34. Use a spray gun to spray 75% alcohol solution in sequence to remove dust, grease and other impurities on the surface of the waterproof mortar layer and the metal plate base, and then use an air gun to blow dry the base to obtain a clean base; S35. Spray a layer of diluted liquid glue on the clean waterproof mortar layer and the surface of the metal plate base to form an intermediate bonding layer with a thickness of about 2 μm after drying; S36. The coating of the present invention is sprayed on the surface of the intermediate bonding layer, and after drying, a temperature-changing color response and radiation cooling functional film with a thickness of about 50 μm that is strongly bonded to the substrate is obtained.

[0028] The temperature-changing color response and radiation cooling functional film prepared in this implementation case has the following test results: (1) In the thermochromic response and radiation cooling functional films, the substances are evenly distributed and the films are dense, such as Figure 1 ; (2) The temperature-changing color response and radiation cooling functional film appear light yellow and reddish brown respectively around 50°C, thus realizing visual judgment of the building wall temperature, such as Figure 2 ; (3) The diffuse reflectance of the temperature-changing color response and radiation cooling functional films in the solar spectrum band around 50°C is greater than 0.84, such as Figure 3 ; (4) The emissivity of the temperature-changing color response and radiation cooling functional films in the atmospheric window band around 50°C is greater than 0.88, such as Figure 4 ; (5) Cooling efficiency under direct sunlight ≥ 90 W / m 2 .

[0029] [Example 2]

[0030] A coating for preparing a temperature-changing color response and radiation cooling functional film consists of the following ingredients: 10 wt% of montmorillonite, 9 wt% of silicon oxide microspheres, 5 wt% of silver tetraiodomercurate, 20 wt% of polydimethylsiloxane with high infrared emission spectrum emissivity, 8 wt% of spectrally transparent polymethylpentene, 3 wt% of propylene glycol functional additive, and 45 wt% of n-hexane solvent.

[0031] The process of preparing the coating is: S41 10 wt% montmorillonite, 9 wt% silica microspheres, 5 wt% silver tetraiodomercurate were dispersed in 25 wt% n-hexane solvent by ultrasonic and stirring to obtain a solution A; S42. 20 wt% polydimethylsiloxane and 8 wt% spectrally transparent polymethylpentene were dispersed in 20 wt% n-hexane solvent by ultrasonic and stirring to obtain a solution B; S43. After solution A and solution B are mixed in a certain proportion, 3 wt % of propylene glycol functional additive is added, and a uniform solution is obtained by ultrasound and stirring, which is the smart building coating described in this patent.

[0032] The process of using coatings to prepare temperature-changing color response and radiation cooling functional films is as follows: S44. Use a spray gun to spray 75% alcohol solution in sequence to remove dust, grease and other impurities on the surface of the waterproof mortar layer and the metal plate base, and then use an air gun to blow dry the base to obtain a clean base; S45. Spray a layer of diluted liquid glue on the clean waterproof mortar layer and the surface of the metal plate base to form an intermediate bonding layer with a thickness of about 2 μm after drying; S46. The coating of the present invention is applied on the surface of the intermediate bonding layer, and after drying, a temperature-changing color response and radiation cooling functional film having a thickness of about 50 μm and strong bonding with the substrate is obtained.

[0033] The temperature-changing color response and radiation cooling functional film prepared in this implementation case has the following test results: (1) In the thermochromic response and radiation cooling functional films, the substances are evenly distributed and the films are dense; (2) The temperature-changing color response and radiation cooling functional films appear light yellow and reddish brown respectively around 50°C, enabling visual judgment of the building wall temperature; (3) The diffuse reflectance of the thermochromic response and radiation cooling functional films around 50°C is greater than 0.87; (4) The atmospheric window emissivity of the thermochromic response and radiation cooling functional films around 50°C is greater than 0.81, such as Figure 5 ; (5) Cooling efficiency under direct sunlight ≥ 82 W / m 2 .

Claims

1. An intelligent architectural coating capable of preparing a thermochromic response and radiation cooling functional film, characterized in that: The invention is prepared from the following components in the following mass fraction ratios: 5-15 wt% of montmorillonite, 5-15 wt% of silicon oxide microspheres, 5-15 wt% of silver tetraiodomercurate, 10-30 wt% of a polymer transparent in the visible spectrum or emitting in the high infrared spectrum, 0-5 wt% of a functional additive, and 30-50 wt% of a solvent.

2. According to claim 1, the montmorillonite component has a particle size of 100 nm to 1000 nm.

3. According to claim 1, the silicon oxide is a spherical particle with a particle size of 100 nm to 5000 nm.

4. According to claim 1, the spectrally transparent or high infrared emitting polymer is polymethylpentene (TPX) or polydimethylsiloxane (PDMS).

5. According to claim 1, the silver tetraiodomercurate is in the form of nano powder, prepared by chemical precipitation method, and has a particle size of 100 nm to 500 nm.

6. According to claim 1, preferably, the functional additive is one or any combination of two or more of a film-forming aid, a defoaming agent, a surfactant, an antifreeze agent or a bactericide.

7. According to claim 1, the solvent is n-hexane or cyclohexane.

8. The process for preparing the intelligent architectural coating capable of preparing a temperature-changing color response and radiation cooling functional film according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1. The montmorillonite, silver tetraiodine mercuryate, and silica microspheres are dispersed in a solvent using ultrasound and stirring in a certain proportion to obtain a solution A; S2. dispersing polymethylpentene (TPX), polydimethylsiloxane or a composite of the two into a solvent by using ultrasound and stirring to obtain a solution B; S3. After solution A and solution B are mixed in a certain proportion, a certain proportion of functional additives are added, and a uniform solution is obtained by means of ultrasound and stirring, which is the smart building coating described in this patent.

9. The process for preparing a temperature-changing color response and radiation cooling functional film using the coating configured by the present invention according to any one of claims 1 to 8, characterized in that: The following steps are involved: S4. Use a spray gun to spray 75% alcohol solution in sequence to remove dust, grease and other impurities on the surface of the substrate, and then use an air gun to blow dry the substrate to obtain a clean substrate; S5. Spray a layer of diluted liquid glue on the clean substrate surface to form an intermediate bonding layer after drying; S6. The coating of the present invention is applied by scraping, brushing or spraying on the surface of the intermediate bonding layer, and after drying, a film having a temperature-changing color response and a radiation cooling function that is strongly bonded to the substrate is obtained.

10. According to claims 1-9, the substrate of the present invention includes building exterior wall materials such as metal plate substrate, glass substrate, marble substrate, waterproof mortar coating, and tile substrate.

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