CN115449294A - Radiation refrigeration high-weather-resistance flexible ceramic coating system and preparation method thereof - Google Patents
Radiation refrigeration high-weather-resistance flexible ceramic coating system and preparation method thereof Download PDFInfo
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Abstract
The invention relates to the technical field, in particular to a radiation refrigeration high-weather-resistance flexible ceramic coating system which is composed of a flexible ceramic pure white primer and a flexible ceramic finishing varnish. The flexible ceramic pure white primer mainly plays a role in covering the base material and reflecting the visible light part in sunlight; the flexible ceramic finishing varnish has the main function of converting ultraviolet light in sunlight into visible light, and the visible light is re-emitted under the synergistic action of the base color varnish, so that the heat effect of the sunlight is effectively avoided. In direct sunlight in summer, the surface temperature of the coating system is obviously lower than the ambient temperature, and the passive radiation refrigeration effect is extremely obvious. The invention has simple preparation process, basically does not use organic solvent, has good environmental protection performance and good outdoor weather resistance, and is a novel building energy-saving and emission-reducing material with green environmental protection and outstanding performance.
Description
Technical Field
The invention relates to the technical field of new fluorosilicone materials, in particular to a radiation refrigeration high-weather-resistance flexible ceramic coating system and a preparation method thereof.
Background
In the process of social urbanization and modernization, the world energy consumption is increased day by day, and 15 percent of the world energy consumption is used for cooling buildings in summer. The air conditioner is widely used, and consumes electric energy to discharge heat in a building to the outside, so that a serious urban heat island effect is caused, and the heat outside in summer is more hot and hard to endure. Therefore, the development of new materials and new methods which are beneficial to energy conservation and emission reduction of buildings is an important subject which concerns the national energy safety strategy, and people's welfare and society can continue to develop.
The radiation refrigeration is to utilize the heat radiation of the object on the earth surface to exchange heat with the cold outside sky (+ 3K or-270 ℃) through an atmospheric window (8-13 mu m), and can reduce the surface temperature of the object irradiated by the sunlight to be lower than the ambient temperature under the condition of not consuming any energy. In order to realize that the surface temperature of an object is lower than the ambient temperature under the direct sunlight, the solar reflectivity of the surface of the object is required to be more than or equal to 94 percent, and the selective infrared radiance at an atmospheric window is required to be as high as possible. The white color can reflect sunlight to the maximum extent and reduce the absorption of objects to solar heat, and the daytime radiation refrigerating materials based on the coating technology in the world are all single white so far.
Common white color fillers include titanium dioxide, barium sulfate, calcium carbonate and polytetrafluoroethylene powder. However, titanium white has strong absorption in the ultraviolet region, and can be used as a pigment, but cannot achieve the aim that the surface temperature of an object is lower than the ambient temperature under the direct irradiation of sunlight. Barium sulfate, calcium carbonate and polytetrafluoroethylene are commonly used in passive radiation refrigeration coatings, but because the whiteness of the three materials is low, the covering power is not good, and the thickness of a dry film of the coating can exceed 300 mu m to realize a good application effect.
The coating is applied to the external wall of a building, particularly is coated on the surface of an aluminum veneer or a calcium silicate plate to realize long-life protection for more than 15 years, the coating must be high in weather resistance, and flexible ceramic water paint is the product. The coating is prepared by taking water-soluble methyl silicone resin prepared by an in-situ sol-gel method as a main film forming material and a functional nano toughening example as an auxiliary material, has the advantages of high hardness and moderate flexibility, high temperature resistance, oxidation resistance, easy fouling prevention, outstanding weather resistance and the like, and is a new high-performance and environment-friendly coating product developed in recent years and capable of replacing the traditional PVDF coating. The thickness of the flexible ceramic coating is not more than 70 μm in view of economy and coating reliability, which means that the preparation of the passive radiation refrigeration flexible ceramic water paint by using a method of coloring barium sulfate, calcium carbonate and polytetrafluoroethylene powder is not feasible.
Disclosure of Invention
The invention aims to solve the defects in the prior art and provides a radiation refrigeration high-weather-resistance flexible ceramic coating system and a preparation method thereof.
In order to achieve the purpose, the invention adopts the following technical scheme:
a radiation refrigeration high weather-proof flexible ceramic coating system is characterized by comprising a flexible ceramic pure white primer and a flexible ceramic finishing varnish;
the flexible ceramic pure white primer is prepared by mixing and dispersing the following raw materials in parts by weight: 30 to 50 portions of water-soluble methyl phenyl silicone resin, 30 to 50 portions of titanium white slurry, 10 to 25 portions of nano toughening emulsion and 0.3 to 2 portions of curing accelerator;
the flexible ceramic finishing varnish is prepared by mixing and dispersing the following raw materials in parts by weight: 45 to 65 portions of water-soluble methyl phenyl silicone resin, 30 to 50 portions of nano toughening emulsion, 2 to 5 portions of ultraviolet excited inorganic fluorescent filler, 0.2 to 0.5 portion of wetting dispersant, 0 to 0.5 portion of flatting agent and 0 to 1 portion of curing accelerator.
Preferably, the water-soluble methyl phenyl silicone resin is prepared by the following components by an in-situ sol-gel method, and the components are as follows in parts by weight: 0 to 50 portions of deionized water, 0 to 50 portions of acid silica sol, 0 to 50 portions of acid aluminum sol, 40 to 70 portions of methyl trialkoxysilane, 0 to 10 portions of tetraalkoxysilane, 0 to 5 portions of phenyl trialkoxysilane, 0 to 5 portions of dimethyl dialkoxysilane, 0 to 5 portions of silane coupling agent, 0 to 1 portion of acid catalyst and 0 to 10 portions of ethanol or isopropanol; the total amount of water in the deionized water, the acidic silica sol and the acidic aluminum sol is not less than the theoretical water requirement for complete hydrolysis of siloxane.
Preferably, the methyl trialkoxysilane is methyl trimethoxysilane or methyl triethoxysilane; the tetraalkoxysilane is tetramethoxysilane or tetraethoxysilane; the phenyl trialkoxysilane is phenyl trimethoxysilane or phenyl triethoxysilane; the dimethyldialkoxysilane is dimethyldimethoxysilane or dimethyldiethoxysilane.
Preferably, the acidic catalyst is hydrochloric acid, acetic acid or formic acid.
Preferably, the titanium dioxide is prepared by grinding and dispersing the following components in parts by weight at a high speed: 25 to 40 portions of deionized water, 50 to 70 portions of titanium pigment, 0 to 5 portions of barium sulfate, 0 to 5 portions of talcum powder, 1.5 to 3.5 portions of dispersant, 0.2 to 0.5 portion of defoaming agent, 0.6 to 2 portions of wetting and leveling agent and 0.3 to 0.8 portion of thickening agent; the grain diameter of the color paste after grinding and dispersion is less than or equal to 20 mu m.
Preferably, the nano toughening emulsion is one or more of anionic or nonionic polyacrylate emulsion, organic silicon and acrylic acid modified organic silicon emulsion, and the average particle size of the emulsion particles is 10-100 nm.
Preferably, the curing agent accelerator is one or more of tetramethylammonium hydroxide, tetrabutylammonium hydroxide, guanidine hydrochloride and 1, 8-diazabicycloundec-7-ene, or one or more of hydrochloride of tetramethylammonium hydroxide, hydrochloride of tetrabutylammonium hydroxide and hydrochloride of 1, 8-diazabicycloundec-7-ene, or one or more of acetate of tetramethylammonium hydroxide, acetate of tetrabutylammonium hydroxide and acetate of 1, 8-diazabicycloundec-7-ene.
Preferably, the ultraviolet light excited inorganic fluorescent filler comprises the following components in parts by weight: liSrPO 4 :Eu 2+ 30～60、Zn 2 SiO 4 :Mn 5～20、Ca 2 Al 3 O 6 F:Eu 2+ 0～15、BaAl 2 Si 2 O 8 :Ce 3+ 0～18。
A preparation method of a radiation refrigeration high-weather-resistance flexible ceramic coating comprises the following steps:
s1, preparation of water-soluble methyl silicone resin: mixing and stirring deionized water, acidic silica sol, acidic aluminum sol, an acidic catalyst, a silane coupling agent and isopropanol uniformly according to a ratio, then adding a siloxane monomer, and quickly stirring for 5-20 minutes to form a homogeneous system for later use;
s2, preparing titanium white slurry: adding deionized water, a dispersing agent, a defoaming agent, a wetting and leveling agent and a thickening agent into a container, uniformly stirring, adding titanium dioxide, barium sulfate and talcum powder, stirring for 10-20 min, grinding at high speed in a grinding machine, dispersing until the fineness is less than or equal to 20 mu m, filtering and discharging for later use;
s3, preparing the flexible ceramic pure white primer: adding the water-soluble methyl phenyl silicone resin, the titanium white slurry, the nano toughening emulsion and the curing accelerator into a stirring kettle according to the proportion, uniformly mixing and stirring, and filtering to obtain the flexible ceramic pure white primer;
s4, flexible ceramic finishing varnish: mixing the nano toughening emulsion, the ultraviolet excited inorganic fluorescent filler and the wetting dispersant according to the proportion, quickly dispersing the mixture by using a dispersion disc until the fineness is less than or equal to 10 mu m, adding the water-soluble methyl phenyl silicone resin and the flatting agent, uniformly stirring the mixture again, and filtering the mixture to obtain the flexible ceramic finishing paint;
s5, spraying: and (3) polishing and soot blowing the base material, cleaning, drying, spraying a flexible ceramic pure white primer, and spraying a flexible ceramic finishing varnish in a wet-on-wet manner after 2-5 minutes.
Preferably, a gradient temperature rise and fall curing mode is adopted, and the curing condition is (120-160) ° c/20-30 min.
The beneficial effects of the invention are:
1. by introducing the flexible ceramic finishing coating containing the ultraviolet excited inorganic fluorescent pigment, the problem of strong light absorption of the titanium white pigment in a sunlight ultraviolet region is solved, and a high weather-resistant flexible ceramic coating system with a daytime radiation refrigeration effect is successfully developed.
2. The titanium dioxide is used as a main pigment of the flexible ceramic base paint, so that the covering of the coating on a base material under the condition of low film thickness is ensured, and the long-term application reliability of the ceramic coating is also ensured, the ultraviolet excited inorganic fluorescent pigment filler is introduced into the flexible ceramic cover light, the ultraviolet light in the sunlight is effectively converted into visible light, and the visible light is reflected out under the synergistic action of the base paint, so that the total reflectivity of the whole coating on the sunlight reaches more than 96%, the infrared radiance is not less than 90%, the heat effect of the sunlight is effectively avoided, the surface temperature of the coating system is obviously lower than the ambient temperature under the direct irradiation of the sunlight in summer, and the passive radiation refrigeration effect is extremely remarkable.
3. The invention has simple preparation process, basically no use of organic solvent, good environmental protection performance, good outdoor weather resistance, reduced energy consumption, environmental protection and important application value.
Drawings
FIG. 1 is a schematic structural diagram of a radiation-cooled high-weatherability flexible ceramic coating system according to the present invention;
FIG. 2 is a schematic flow chart of a preparation method of a radiation refrigeration high weather-resistant flexible ceramic coating provided by the invention;
FIG. 3 is a graph of the temperature change of an example of a radiation-cooled highly weatherable flexible ceramic coating system according to the present invention and a comparative example in summer sun exposure.
In the figure: 1. a substrate; 2. flexible ceramic finishing varnish; 3. flexible ceramic pure white primer.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The raw materials used in the examples are, unless otherwise stated, commercially available products which are commercially available and the coating properties are determined by the methods specified in GB/T23443-2009.
The first embodiment is as follows:
a preparation method of a radiation refrigeration high-weather-resistance flexible ceramic coating comprises the following steps:
s1, preparing water-soluble methyl phenyl silicone resin:
s1-1, preparing the following components according to a formula: 10g of deionized water, 15g of acidic silica sol (solid parts: 30%), 1g of acetic acid, 30g of methyltrimethoxysilane and 5g of phenyltriethoxysilane;
s1-2, resin synthesis: uniformly mixing acidic silica sol, deionized water and acetic acid, adding methyltrimethoxysilane and phenyltriethoxysilane, and stirring at the speed of 600r/min for reaction for 6-8 minutes for later use;
s2, preparing titanium white slurry:
s2-1, preparing the following components according to a formula: 30g of deionized water, 60g of R-960 titanium dioxide, 5g of precipitated barium sulfate, 2g of dispersing agent, 0.3g of defoaming agent, 1.2 g of wetting and leveling agent and 0.6g of bentonite thickener;
s2-2, preparing titanium white slurry: sequentially adding deionized water, a dispersing agent, a defoaming agent, a wetting and leveling agent and a bentonite thickener into a dispersion kettle, uniformly stirring, adding titanium dioxide and precipitated barium sulfate, stirring again, grinding at high speed in a grinding and dispersing machine until the fineness is less than or equal to 15 mu m, and discharging for later use;
s3, preparing the flexible ceramic pure white base paint: starting stirring in a stainless steel container, sequentially adding 40g of the prepared water-soluble methyl phenyl silicone resin, 45g of titanium white slurry, 15g of polyacrylate nano toughening emulsion and 0.3g of tetramethylammonium chloride curing accelerator, uniformly stirring, and filtering for later use;
s4, preparing the flexible ceramic finishing coating: sequentially adding 150g of deionized water, 150g of inorganic fluorescent pigment filler (1500 meshes) and 10g of wetting dispersant into a dispersion kettle, uniformly stirring, dispersing at high speed until the fineness is less than or equal to 10 mu m, and discharging for later use;
s5, taking 100g of the prepared water-soluble methyl phenyl silicone resin, sequentially adding 10g of inorganic fluorescent pigment and filler dispersion liquid, 100g of polyacrylate toughening emulsion, 0.4g of wetting and leveling agent and 0.5g of tetramethylammonium chloride curing accelerator, uniformly stirring, and filtering for later use;
s6, spraying and curing: taking a 300mm multiplied by 450mm aluminum plate, polishing the aluminum plate by 240-mesh abrasive paper, then sequentially cleaning the aluminum plate by using special acid cleaning solution and deionized water, and drying the aluminum plate to enter a spraying link.
Firstly, flexible ceramic pure white base paint is sprayed, and the thickness of a dry film is controlled to be 40-50 mu m. After the spraying is finished, the mixture is placed at 25 ℃ for 6 to 10 minutes; and then, spraying the flexible ceramic finishing paint in a wet-on-wet manner, wherein stirring is carried out during the spraying process to prevent the fluorescent pigment and the filler from settling, and the thickness of a dry film of the finishing layer is controlled to be 6-10 mu m.
After the spraying was complete, the coating was pre-dried for 15 minutes at 40 ℃ and then cured for a further 20 minutes at 120 ℃.
The flexible ceramic base paint takes titanium dioxide as pigment, and mainly plays a role in covering a base material and reflecting visible light in sunlight; the finishing paint contains a proper amount of ultraviolet excited inorganic fluorescent filler, and has the main function of converting ultraviolet in sunlight into visible light, and emitting the visible light again under the synergistic action of the base paint, so that the solar reflectivity of the surface of an object is ensured to be not less than 94 percent, the passive radiation refrigeration effect is achieved, and the light and color retention performance and the hydrophobic easy-cleaning performance of the whole coating can be further improved.
The ultraviolet light excited inorganic fluorescent filler comprises the following components in parts by weight: liSrPO 4 :Eu 2+ 50 portions of Zn 2 SiO 4 10 parts of Mn and BaAl 2 Si 2 O 8 :Ce 3+ 10 parts of ultraviolet light excited inorganic fluorescent filler, wherein the excitation wavelength of the ultraviolet light excited inorganic fluorescent filler is 240-400 nm, and the fluorescence quantum is 92%.
The second embodiment:
a preparation method of a radiation refrigeration high-weather-resistance flexible ceramic coating comprises the following steps:
s1, preparation of water-soluble methyl phenyl silicone resin:
s1-1, preparing the following components according to a formula: 15g of deionized water, 20g of acidic silica sol (solid part: 30%), 1g of hydrochloric acid, 1g of silane coupling agent, 40g of methyltrimethoxysilane, 5g of tetramethoxysilane and 5g of phenyltriethoxysilane;
s1-2, resin synthesis: uniformly mixing acidic silica sol, deionized water, a silane coupling agent and acetic acid, adding methyltrimethoxysilane, tetramethoxysilane and phenyltriethoxysilane, and stirring at the speed of 600r/min for reaction for 6-8 minutes for later use;
s2, preparing titanium white slurry:
s2-1, preparing the following components according to a formula: 30g of deionized water, 60g of R-960 titanium dioxide, 5g of precipitated barium sulfate, 2g of dispersing agent, 0.3g of defoaming agent, 1.2 g of wetting and leveling agent and 0.6g of bentonite thickener;
s2-2, preparing titanium white slurry: sequentially adding deionized water, a dispersing agent, a defoaming agent, a wetting and leveling agent and a bentonite thickener into a dispersion kettle, uniformly stirring, adding titanium dioxide and precipitated barium sulfate, stirring again, grinding at high speed in a grinding and dispersing machine until the fineness is less than or equal to 15 mu m, and discharging for later use;
s3, preparing the flexible ceramic pure white base paint: stirring the mixture in a stainless steel container, sequentially adding 40g of the prepared water-soluble methyl phenyl silicone resin, 45g of titanium white slurry, 15g of polyacrylate nano toughening emulsion and 0.3g of tetramethylammonium chloride curing accelerator, uniformly stirring, and filtering for later use;
s4, preparing the flexible ceramic finishing coating: sequentially adding 150g of deionized water, 160g of inorganic fluorescent pigment filler (1500 meshes) and 10g of wetting dispersant into a dispersion kettle, uniformly stirring, dispersing at high speed until the fineness is less than or equal to 10 mu m, and discharging for later use;
s5, taking 100g of the prepared water-soluble methyl phenyl silicone resin, sequentially adding 10g of inorganic fluorescent pigment filler dispersion liquid, 100g of polyacrylate toughening emulsion, 0.4g of wetting and leveling agent and 0.5g of tetramethylammonium chloride curing accelerator, uniformly stirring and filtering for later use;
s6, spraying and curing: taking a 300mm multiplied by 450mm aluminum plate, polishing the aluminum plate by 240-mesh abrasive paper, then sequentially cleaning the aluminum plate by using special acid cleaning solution and deionized water, and drying the aluminum plate to enter a spraying link.
Firstly, spraying flexible ceramic pure white base paint, and controlling the thickness of a dry film to be 40-50 mu m. After the spraying is finished, the mixture is placed at 25 ℃ for 6 to 10 minutes; and then, spraying the flexible ceramic finishing paint in a wet-on-wet manner, wherein stirring is carried out during the spraying process to prevent the fluorescent pigment and the filler from settling, and the thickness of a dry film of the finishing layer is controlled to be 6-10 mu m.
After the spraying was complete, the coating was pre-dried for 15 minutes at 40 ℃ and then cured for a further 20 minutes at 120 ℃.
The flexible ceramic base paint takes titanium dioxide as pigment, and mainly plays a role in covering a base material and reflecting visible light in sunlight; the finishing paint contains a proper amount of ultraviolet excited inorganic fluorescent filler, and has the main function of converting ultraviolet in sunlight into visible light, and emitting the visible light again under the synergistic action of the base paint, so that the solar reflectivity of the surface of an object is ensured to be not less than 94 percent, the passive radiation refrigeration effect is achieved, and the light and color retention performance and the hydrophobic easy-cleaning performance of the whole coating can be further improved.
Wherein the ultraviolet light excites the inorganic fluorescent fillerThe material consists of the following components in parts by weight: liSrPO 4 :Eu 2+ 50 portions of Zn 2 SiO 4 10 parts of Mn and Ca 2 Al 3 O 6 F:Eu 2+ 5 parts of inorganic fluorescent filler excited by ultraviolet light, wherein the excitation wavelength of the inorganic fluorescent filler is 240-400 nm, and the fluorescence quantum is 90%.
Example three:
a preparation method of a radiation refrigeration high-weather-resistance flexible ceramic coating comprises the following steps:
s1, preparing water-soluble methyl phenyl silicone resin:
s1-1, preparing the following components according to a formula: 10g of deionized water, 15g of acidic silica sol (solid parts: 30%), 1g of acetic acid, 30g of methyltrimethoxysilane and 5g of phenyltriethoxysilane;
s1-2, resin synthesis: uniformly mixing acidic silica sol, deionized water and acetic acid, adding methyltrimethoxysilane and phenyltriethoxysilane, and stirring at the speed of 600r/min for reaction for 6-8 minutes for later use;
s2, preparing titanium white slurry:
s2-1, preparing the following components according to a formula: 30g of deionized water, 60g of R-960 titanium dioxide, 5g of precipitated barium sulfate, 2g of dispersing agent, 0.3g of defoaming agent, 1.2 g of wetting and leveling agent and 0.6g of bentonite thickener;
s2-2, preparing titanium white slurry: sequentially adding deionized water, a dispersing agent, a defoaming agent, a wetting and leveling agent and a bentonite thickening agent into a dispersion kettle, uniformly stirring, adding titanium dioxide and precipitated barium sulfate, stirring again, grinding at a high speed in a grinding and dispersing machine until the fineness is less than or equal to 15 mu m, and discharging for later use;
s3, preparing the flexible ceramic pure white base paint: stirring the mixture in a stainless steel container, sequentially adding 40g of the prepared water-soluble methyl phenyl silicone resin, 45g of titanium white slurry, 15g of polyacrylate nano toughening emulsion and 0.3g of tetramethylammonium chloride curing accelerator, uniformly stirring, and filtering for later use;
s4, preparing the flexible ceramic finishing coating: sequentially adding 150g of deionized water, 160g of inorganic fluorescent pigment filler (1500 meshes) and 10g of wetting dispersant into a dispersion kettle, uniformly stirring, dispersing at high speed until the fineness is less than or equal to 10 mu m, and discharging for later use;
s5, taking 100g of the prepared water-soluble methyl phenyl silicone resin, sequentially adding 10g of inorganic fluorescent pigment filler dispersion liquid, 100g of polyacrylate toughening emulsion, 0.4g of wetting and leveling agent and 0.5g of tetramethylammonium chloride curing accelerator, uniformly stirring and filtering for later use;
s6, spraying and curing: taking a 300mm multiplied by 450mm aluminum plate, polishing the aluminum plate by 240-mesh abrasive paper, then sequentially cleaning the aluminum plate by using special acid cleaning solution and deionized water, and drying the aluminum plate to enter a spraying link.
Firstly, spraying flexible ceramic pure white base paint, and controlling the thickness of a dry film to be 40-50 mu m. After the spraying is finished, placing for 6-10 minutes at 25 ℃; and then, spraying the flexible ceramic finishing paint in a wet-on-wet manner, wherein stirring is carried out in the spraying process to prevent the fluorescent pigment and filler from settling, and the thickness of the dry film of the finishing layer is controlled to be 6-10 mu m.
After the spraying was complete, the coating was pre-dried for 15 minutes at 40 ℃ and then cured for a further 20 minutes at 120 ℃.
The flexible ceramic base paint takes titanium dioxide as pigment, and mainly plays a role in covering a base material and reflecting visible light in sunlight; the finishing paint contains a proper amount of ultraviolet excited inorganic fluorescent filler, and has the main function of converting ultraviolet in sunlight into visible light, and emitting the visible light again under the synergistic action of the base paint, so that the solar reflectivity of the surface of an object is ensured to be not less than 94 percent, the passive radiation refrigeration effect is achieved, and the light and color retention performance and the hydrophobic easy-cleaning performance of the whole coating can be further improved.
The ultraviolet light excited inorganic fluorescent filler comprises the following components in parts by weight: liSrPO 4 :Eu 2+ 50 portions of Zn 2 SiO 4 20 parts of Mn, the excitation wavelength of the ultraviolet light excited inorganic fluorescent filler is 240-400 nm, and the fluorescence quantum is 91%.
Comparative example one:
the preparation method of the coating comprises the following steps:
s1, preparing a base color paint in the same way as in the first embodiment;
s2, preparing a flexible ceramic finishing coating: taking 100g of the prepared water-soluble methyl phenyl silicone resin, 100g of polyacrylate toughening emulsion, 0.4g of wetting and leveling agent and 0.5g of tetramethylammonium chloride curing accelerator, uniformly stirring and filtering for later use;
s3, spraying and curing: taking a 300mm multiplied by 450mm aluminum plate, polishing the aluminum plate by 240-mesh abrasive paper, then sequentially cleaning the aluminum plate by using special acid cleaning solution and deionized water, and drying the aluminum plate to enter a spraying link.
Firstly, spraying flexible ceramic pure white base paint, and controlling the thickness of a dry film to be 40-50 mu m. After the spraying is finished, the mixture is placed at 25 ℃ for 6 to 10 minutes; and then, spraying flexible ceramic finishing paint without inorganic fluorescent pigment and filler in a wet-on-wet manner, wherein the thickness of a dry film of the finishing layer is controlled to be 6-10 mu m. After the spraying was complete, the coating was pre-dried for 15 minutes at 40 ℃ and then cured for a further 20 minutes at 120 ℃.
Comparative example two: smooth aluminum plate
Table 1: basic performance of the coatings of examples 1, 2, 3 and 1
As can be seen from Table 1, the introduction of the inorganic fluorescent filler has no significant influence on the basic performance of the flexible ceramic coating, and examples 1, 2, 3 and 1 all have excellent weather resistance and meet the technical requirements of outdoor long-life protection.
FIG. 3 is a graph showing the temperature change at different times for example 1, example 2, example 3, comparative example 1 and comparative example 2 in direct exposure to the sun in summer. As can be seen, the aluminum plate can easily absorb the sunlight heat and the heat enrichment effect, and the maximum temperature of the surface of the aluminum plate can reach 56 ℃; in comparative example 1, although there is no fluorescent emitting material in the cover coat, because R-960 titanium white of the primer has a high reflectivity to sunlight in the visible region, the surface temperature is still significantly lower than that of the bare aluminum plate (but higher than the ambient temperature); in the embodiments 1, 2 and 3, the ultraviolet light in the finishing coating excites the inorganic fluorescent filler, so that the absorption of the base paint to the solar ultraviolet light and the heat effect generated by the solar ultraviolet light are greatly reduced, the surface temperature of the coating system is obviously lower than the ambient temperature by 2-4.5 ℃, and the passive radiation refrigeration effect is extremely obvious. As the surface temperature of the coatings of the embodiments 1, 2 and 3 is lower than the ambient temperature, water drops are easy to condense on the surfaces of the coatings, and the antifouling and self-cleaning performance of the coatings is obviously improved.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (10)
1. A radiation refrigeration high weather-proof flexible ceramic coating system is characterized by comprising a flexible ceramic pure white primer and a flexible ceramic finishing varnish;
the flexible ceramic pure white primer is prepared by mixing and dispersing the following raw materials in parts by weight: 30 to 50 portions of water-soluble methyl phenyl silicone resin, 30 to 50 portions of titanium white slurry, 10 to 25 portions of nano toughening emulsion and 0.3 to 2 portions of curing accelerator;
the flexible ceramic finishing varnish is prepared by mixing and dispersing the following raw materials in parts by weight: 45 to 65 portions of water-soluble methyl phenyl silicone resin, 30 to 50 portions of nano toughening emulsion, 2 to 5 portions of ultraviolet excited inorganic fluorescent filler, 0.2 to 0.5 portion of wetting dispersant, 0 to 0.5 portion of flatting agent and 0 to 1 portion of curing accelerator.
2. The radiation refrigeration high weather-resistant flexible ceramic coating system as claimed in claim 1, wherein the water-soluble methyl phenyl silicone resin is prepared by an in-situ sol-gel method from the following components in parts by weight:
0 to 50 portions of deionized water, 0 to 50 portions of acid silica sol, 0 to 50 portions of acid aluminum sol, 40 to 70 portions of methyl trialkoxysilane, 0 to 10 portions of tetraalkoxysilane, 0 to 5 portions of phenyl trialkoxysilane, 0 to 5 portions of dimethyl dialkoxysilane, 0 to 5 portions of silane coupling agent, 0 to 1 portion of acid catalyst and 0 to 10 portions of ethanol or isopropanol;
the total amount of water in the deionized water, the acidic silica sol and the acidic aluminum sol is not less than the theoretical water requirement for complete hydrolysis of siloxane.
3. The radiation refrigeration high weatherability flexible ceramic coating system according to claim 2, wherein the methyltrialkoxysilane is methyltrimethoxysilane or methyltriethoxysilane; the tetraalkoxysilane is tetramethoxysilane or tetraethoxysilane; the phenyl trialkoxysilane is phenyl trimethoxysilane or phenyl triethoxysilane; the dimethyldialkoxysilane is dimethyldimethoxysilane or dimethyldiethoxysilane.
4. The radiation refrigeration high weatherability flexible ceramic coating system according to claim 2, wherein the acidic catalyst is hydrochloric acid, acetic acid or formic acid.
5. The radiation refrigeration high weather resistance flexible ceramic coating system as claimed in claim 1, wherein the titanium dioxide is prepared by high speed grinding and dispersing the following components in parts by weight: 25 to 40 portions of deionized water, 50 to 70 portions of titanium pigment, 0 to 5 portions of barium sulfate, 0 to 5 portions of talcum powder, 1.5 to 3.5 portions of dispersant, 0.2 to 0.5 portion of defoaming agent, 0.6 to 2 portions of wetting and leveling agent and 0.3 to 0.8 portion of thickening agent;
the grain diameter of the color paste after grinding and dispersion is less than or equal to 20 mu m.
6. The radiation refrigeration high weather resistance flexible ceramic coating system according to claim 1, wherein the nano toughening emulsion is one or more of anionic or nonionic polyacrylate emulsion, organic silicon and acrylic acid modified organic silicon emulsion, and the average particle size of latex particles is 10-100 nm.
7. A flexible ceramic coating system with high weatherability and radiation refrigeration as claimed in claim 1, wherein the curing agent accelerator is one or more of tetramethylammonium hydroxide, tetrabutylammonium hydroxide, guanidine hydrochloride and 1, 8-diazabicycloundec-7-ene, or one or more of hydrochloride of tetramethylammonium hydroxide, hydrochloride of tetrabutylammonium hydroxide and hydrochloride of 1, 8-diazabicycloundec-7-ene, or one or more of acetate of tetramethylammonium hydroxide, acetate of tetrabutylammonium hydroxide and acetate of 1, 8-diazabicycloundec-7-ene.
8. The radiation refrigeration high weather resistance flexible ceramic coating system as claimed in claim 1, wherein the ultraviolet light excited inorganic fluorescent filler is composed of the following components in parts by weight: liSrPO 4 :Eu 2+ 30～60、Zn 2 SiO 4 :Mn 5～20、Ca 2 Al 3 O 6 F:Eu 2+ 0～15、BaAl 2 Si 2 O 8 :Ce 3+ 0～18。
9. A preparation method of a radiation refrigeration high-weather-resistance flexible ceramic coating is characterized by comprising the following steps:
s1, preparation of water-soluble methyl silicone resin: mixing and stirring deionized water, acidic silica sol, acidic aluminum sol, an acidic catalyst, a silane coupling agent and isopropanol uniformly according to a ratio, then adding a siloxane monomer, and stirring quickly for 5-20 minutes until a homogeneous system is formed for later use;
s2, preparing titanium white slurry: adding deionized water, a dispersing agent, a defoaming agent, a wetting and leveling agent and a thickening agent into a container, uniformly stirring, adding titanium dioxide, barium sulfate and talcum powder, stirring for 10-20 min, grinding at high speed in a grinding machine, dispersing until the fineness is less than or equal to 20 mu m, filtering and discharging for later use;
s3, preparing the flexible ceramic pure white primer: adding the water-soluble methyl phenyl silicone resin, the titanium white slurry, the nano toughening emulsion and the curing accelerator into a stirring kettle according to the proportion, uniformly mixing and stirring, and filtering to obtain the flexible ceramic pure white primer;
s4, flexible ceramic finishing varnish: mixing the nano toughening emulsion, the ultraviolet excited inorganic fluorescent filler and the wetting dispersant according to the proportion, quickly dispersing the mixture by using a dispersion disc until the fineness is less than or equal to 10 mu m, adding the water-soluble methyl phenyl silicone resin and the flatting agent, uniformly stirring the mixture again, and filtering the mixture to obtain the flexible ceramic finishing paint;
s5, spraying: and (3) polishing and soot blowing the base material, cleaning, drying, spraying a flexible ceramic pure white primer, and spraying a flexible ceramic finishing varnish in a wet-on-wet manner after 2-5 minutes.
10. The method for preparing a flexible ceramic coating with high weatherability and radiation refrigeration as claimed in claim 9, wherein the curing condition is (120-160) ° c/20-30) min by gradient temperature rise and fall curing.
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