CN114181626B - Preparation method of heat-insulating antifogging self-cleaning super-hydrophilic transparent coating - Google Patents
Preparation method of heat-insulating antifogging self-cleaning super-hydrophilic transparent coating Download PDFInfo
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Abstract
The invention discloses a preparation method of a heat-insulating, anti-fog and self-cleaning super-hydrophilic transparent coating, which comprises the following steps of preparing a nano heat-insulating powder slurry dispersion liquid; step two, preparing a hydrophilic polymer solution with a certain crosslinking degree; step three, preparing a super-hydrophilic transparent coating with heat insulation, antifogging and self-cleaning functions; uniformly stirring the nano heat insulation powder dispersion slurry obtained in the step one and the hydrophilic polymer and the auxiliary agent with a certain crosslinking degree obtained in the step two, then spraying the obtained solution on the surface of a glass substrate, putting the sprayed and coated glass into an oven for drying, and drying to obtain the super-hydrophilic transparent coating with heat insulation, antifogging and self-cleaning functions. The invention solves the problems of poor antifogging durability, poor water resistance, poor weather resistance and poor wiping resistance of the existing super-hydrophilic coating.
Description
Technical Field
The invention relates to the field of chemical coatings, in particular to a preparation method of a super-hydrophilic transparent coating with heat insulation, self-cleaning and anti-fog functions, which requires the priority of application number 2021114097750 filed on 20/11/2021.
Background
As is well known, coatings have three main functions: the product has the functions of decoration, protection and marking. Nowadays, along with the development of human technology, the types and functions of the coating materials are more and more, and the application sites are more and more extensive. However, in some special working environments, the single-function paint cannot meet the requirement of people. In addition, with the rapid development of scientific technology, people have higher and higher performance requirements (such as atomization resistance, heat insulation, sound insulation, bacteria resistance, privacy resistance, stain resistance and the like) on the coating, and the multifunctional performance of the coating is also pursued more and more. Today, it has become a focus of researchers to impart two or more functions on one coating.
In life, when the environment is in cold weather or in a heavy environment with heavy moisture, the surface fogging phenomenon can occur on the building glass or the automobile glass, so that the glass becomes opaque, and the visibility of human eyes is greatly reduced. When a person drives a vehicle, the probability of an accident may be increased. The fogging phenomenon is caused by the phenomenon that water vapor or moisture is condensed on the surface of a cold substrate to form fine water droplets, and light is reflected and scattered when passing through the fine water droplets, thereby reducing the light transmittance of the transparent substrate, causing the fogging phenomenon to make the transparent substrate opaque.
In order to solve the above problems, a common method is to apply a super-hydrophilic coating on the surface of the substrate. The superhydrophilic surface is affected by two factors. First, surface energy; secondly, surface roughness. The contact angle of water drops on the surface of the material is below 10 degrees on the super-hydrophilic surface, and the water drops can be completely spread on the surface of the super-hydrophilic coating to form a transparent water film; in addition, the super-hydrophilic coating also has a self-cleaning effect. When water vapor or moisture contacts the super-hydrophilic coating, a water film is formed, the water film can prevent dirt from contacting the surface, and the dirt and dust on the surface can be taken away under the action of water scouring, so that the aim of self-cleaning is fulfilled. However, this method is to coat an antifogging coating on the surface of the substrate, and if a functional coating is coated on the substrate, then a further antifogging coating is coated on the substrate, which may not only cause the chemical components between two coatings with different functionalities to react, thereby possibly causing the two coatings to lose their functions at the same time; furthermore, the adhesion between layers is a problem, and most importantly, the coating with two different functions can greatly increase the coating cost and the process cost. At present, most of glass on automobiles is pasted with a layer of heat insulation film, the function is single, and the glass has no antifogging and self-cleaning functions. If the functions of fog prevention, self cleaning and heat insulation are endowed on the same coating, the coating realizes the multifunctionality.
Currently, very few reports are reported on superhydrophilic coatings having both anti-fog and self-cleaning functions, as well as thermal insulation functions. In chinese patent CN201710393289.1, a method of preparing a super-hydrophilic thermal insulation coating by using a coprecipitation method and a hydrothermal method is reported. The coating is made of TiO2Prepared by compounding with ATO, but the method has the disadvantages of complex preparation process and long experimental period (the hydrothermal reaction time is as long as 12-16 h); secondly, ATO is selected as heat insulation powder, because the near infrared shielding effect of ATO at the wave band of 760nm-1400nm is poor, the infrared blocking rate is about 80%, and the heat insulation performance is not high; secondly, the coating is TiO2And ATO, TiO thereof2The photocatalytic property of the coating needs to be induced under ultraviolet irradiation so as to enable the coating to show super-hydrophilicity. In chinese patent CN201711015343.5, a super-hydrophilic thermal insulation coating reported is prepared by using nano ATO as thermal insulation powder, using an inorganic polymer prepared from silica and inorganic silicate as a bonding layer, wherein one surface is bonded with a substrate, and the other surface is bonded with thermal insulation ATO powder, so that the coating structure may cause too much bonding thermal insulation powder, thereby causing low visible light transmittance, large haze and opacity of the coating. Therefore, there is no discussion of visible light in this patentWhat the transmittance is; and secondly, whether the coating has an anti-fog function or not. In chinese patent CN202021633536.4, a multilayer film technology is introduced to achieve the function of super-hydrophilic heat insulation, but the multilayer film structure has complex preparation process, high cost and high equipment requirement, and most importantly, the heat insulation layer is a magnesium aluminum silicate coating, and the heat insulation layer prepared from the magnesium aluminum silicate has poor heat insulation effect.
Aiming at the problems and the technical defects of the conventional super-hydrophilic coating, the invention successfully prepares the super-hydrophilic transparent coating with the functions of heat insulation, self-cleaning and fog prevention. The coating can realize super-hydrophilic performance without photocatalysis, thereby avoiding weather influence; the test period is short, the cost is low, the process is simple, and the equipment requirement is low; most importantly, the coating is not only excellent in heat insulation performance, but also excellent in antifogging and self-cleaning performances. The coating design idea is that the organic-inorganic hybrid technology is used as knowledge background, the wettability of the coating to water is improved by the polymer rich in hydrophilic functional groups, the surface roughness of the coating is improved by the inorganic functional powder slurry, and the contact angle of the coating is enabled to reach below 10 degrees by the synergistic effect of the hydrophilic functional groups and the inorganic functional powder slurry, so that the requirement of the super-hydrophilic coating is met. The existing antifogging coating generally has the problems of poor antifogging durability, poor water washing resistance, poor weather resistance and poor wiping resistance; however, the super-hydrophilic heat-insulating coating has excellent mechanical properties, the hardness of the super-hydrophilic heat-insulating coating reaches 2H, the adhesive force is 0 grade, and the super-hydrophilic heat-insulating coating is water-resistant and scratch-resistant; the heat insulation performance is excellent, the visible light transmittance is more than or equal to 70%, the infrared blocking rate is more than or equal to 90%, and the maximum temperature difference of a heat insulation film tester can reach 15.6 ℃, which shows that the heat insulation film has excellent heat insulation performance. The coating can be widely applied to curtain wall glass of building doors and windows and glass products of automobiles.
Disclosure of Invention
(1) Technical problem to be solved
Aiming at the defects of the prior art, the invention aims to provide a preparation method of a super-hydrophilic transparent coating with heat insulation, self-cleaning and anti-fog functions, aims to solve the problem that the super-hydrophilic coating in the current market has single function, and develops a coating with anti-fog and self-cleaning functions and heat insulation functions; the problems of poor antifogging durability, poor water resistance, poor weather resistance and poor wiping resistance of the existing super-hydrophilic coating are solved; the problem that the existing heat insulation coating has poor heat insulation effect is solved, and the high infrared blocking rate can be still kept under the condition of keeping high visible light transmittance.
(2) Technical scheme
In order to solve the technical problems, the invention provides a preparation method of a heat-insulating, anti-fog and self-cleaning super-hydrophilic transparent coating, which comprises the following specific steps:
step one, preparing a nano heat insulation powder slurry dispersion liquid;
step two, preparing a hydrophilic polymer solution with a certain crosslinking degree;
dispersing polymers rich in carboxyl functional groups and polymers rich in hydroxyl functional groups in a solvent, uniformly stirring for 10-20 min by magnetic force, adding a cross-linking agent, and magnetically stirring for 30-60 min at normal temperature to obtain a hydrophilic polymer solution with a certain cross-linking degree;
step three, preparing a super-hydrophilic transparent coating with heat insulation, antifogging and self-cleaning functions;
uniformly stirring the nano heat insulation powder dispersion slurry obtained in the first step and the hydrophilic polymer and the auxiliary agent with a certain crosslinking degree obtained in the second step, then spraying the obtained solution on the surface of a glass substrate, putting the sprayed and coated glass into an oven for drying, and drying to obtain the super-hydrophilic transparent coating with heat insulation, antifogging and self-cleaning functions.
The mass fraction of the polymer rich in carboxyl functional groups accounts for 6-10% of the coating system, the mass fraction of the polymer rich in hydroxyl functional groups accounts for 12-18% of the coating system, the mass fraction of the solvent accounts for 45-55% of the system, the mass fraction of the cross-linking agent accounts for 2-4% of the coating system, the mass fraction of the nano heat-insulating powder dispersion slurry accounts for 20-25% of the coating system, and the mass fraction of the auxiliary agent accounts for 0.5-3% of the coating system.
In the first step, the nanometer heat insulation powder, the solvent and the dispersing agent are weighed and placed in a ball milling tank, zirconia balls are weighed according to the ball-to-material ratio of 4: 1-8: 1, the rotating speed of the ball mill is 400r/min, and the ball milling time is 4-8 h. Ball milling to obtain uniformly dispersed nano heat-insulating powder dispersion slurry; wherein the mass of the nanometer heat-insulating powder accounts for 20-30% of the mass of the dispersed slurry, the mass of the solvent accounts for 61-76% of the mass of the dispersed slurry, and the mass of the dispersant accounts for 4-9% of the mass of the dispersed slurry.
In the first step, the solvent is one or a mixture of several of pure water, ethanol, isopropanol and ethyl acetate.
In the second step, the mass ratio of the used polymers of the carboxyl functional group and the hydroxyl functional group is 4: 6-3: 7, and the dosage of the cross-linking agent is 8-12% of the total mass of the hydrophilic polymer.
In the second step, the cross-linking agent is one or a mixture of more of aziridine curing agent, polycarbodiimide cross-linking agent, blocked isocyanate curing agent, gamma-aminopropyltriethoxysilane, gamma-methacryloxypropyltrimethoxysilane and gamma- (2, 3-glycidoxy) propyltrimethoxysilane; the mass ratio of the polymer containing the carboxyl functional group to the polymer containing the hydroxyl functional group is 4: 6-3: 7; the mass of the cross-linking agent is 8-12% of the total mass of the polymer.
In the third step, the using mass of the nano heat insulation powder dispersion slurry is 25-30% of the total mass of the polymer solution with a certain crosslinking degree obtained in the second step.
In the third step, the auxiliary agent is one or a mixture of more of an antioxidant, a leveling agent, a defoaming agent, an ultraviolet absorbent and an adhesion promoter.
Preferably, in the step one, the heat insulation powder is one or a mixture of several of lanthanum hexaboride, antimony tin oxide and cesium tungsten bronze powder.
Preferably, in the step one, the solvent is one or a mixture of several of pure water, ethanol, isopropanol and ethyl acetate.
Preferably, in the first step, the dispersant is one or a mixture of polyacrylates, poly fatty acid oligomers and acidic group-containing polyesters.
Preferably, in the second step, the polymer rich in carboxyl functional groups is one or a mixture of maleic anhydride, polyacrylic acid, salicylic acid and carboxyl modified polyvinyl alcohol.
Preferably, in the second step, the polymer rich in hydroxyl groups is one or more of polyvinyl alcohol, polypropylene glycol with molecular weight of 200, polypropylene glycol with molecular weight of 400, and polypropylene glycol with molecular weight of 800.
Preferably, in the second step, the solvent is one or a mixture of several of pure water, ethanol, isopropanol and ethyl acetate.
Preferably, in the third step, the assistant is one or a mixture of several of an antioxidant, a leveling agent, a defoaming agent, an ultraviolet absorbent and an adhesion promoter.
(3) The characteristics and beneficial effects of the invention
Compared with the prior art, the invention has the characteristics and beneficial effects that: 1. the technical scheme of the invention prepares a multifunctional super-hydrophilic coating in a breakthrough manner, which has good antifogging and self-cleaning functions and excellent heat insulation function; 2. preparing a multifunctional super-hydrophilic coating by using an organic-inorganic hybrid technology; the polymer rich in carboxyl and hydroxyl functional groups is used as a main film forming substance, the heat-insulating inorganic powder is used as functional powder to improve the surface roughness of the coating, and the two substances have synergistic effect, so that the prepared coating meets the requirement of a super-hydrophilic coating, and simultaneously ensures high visible light transmittance and high infrared blocking rate; the addition of the crosslinking agent improves the water resistance of the coating. Tests prove that the surface roughness of the coating is improved due to the addition of the nano heat-insulating powder dispersion slurry, so that the hydrophilic polymer coating added with the cross-linking agent is changed from non-super-hydrophilicity to super-hydrophilicity. 3. Compared with other methods for preparing the super-hydrophilic coating, the preparation process of the super-hydrophilic heat-insulating coating is simple, the test period is short, the cost is low, no pollution is caused, the equipment requirement is low, and the super-hydrophilic heat-insulating coating has a very high industrial prospect; the coating has excellent comprehensive performance, good antifogging durability, water washing resistance and rubbing resistance, the pencil hardness can reach 2H, the water contact angle can be as low as 5.4 degrees, the visible light transmittance is more than or equal to 70 percent, the near infrared blocking rate is more than or equal to 90 percent, and the maximum temperature difference of a heat-insulating film tester can reach 15.6 ℃; 4. the coating has the functions of antifogging, self-cleaning and heat insulation, not only greatly reduces the use amount of an air conditioner which is started due to hot summer, but also reduces the use amount of water which is used for cleaning glass, and plays a great role in energy conservation and emission reduction. The coating can be widely applied to building door and window curtain wall glass and automobile glass products.
Drawings
FIG. 1 is a graph of the static water contact angle of the multifunctional superhydrophilic coating prepared in example 1;
FIG. 2 is a graph of the spectrophotometer transmittance of the multifunctional superhydrophilic coating prepared in example 1;
FIG. 3 is a scanning electron micrograph of the multifunctional superhydrophilic coating prepared in example 1;
FIG. 4 is a graph showing the antifogging effect of the multifunctional superhydrophilic coating prepared in example 1;
FIG. 5 is a graph of the simulated effect of self-cleaning of the multifunctional superhydrophilic coating prepared in example 1.
Detailed Description
A preparation method of a heat-insulating, anti-fog and self-cleaning super-hydrophilic transparent coating comprises the following specific steps:
step one, preparing a nano heat insulation powder slurry dispersion liquid; weighing nanometer heat insulation powder, a solvent and a dispersing agent, placing the nanometer heat insulation powder, the solvent and the dispersing agent in a ball milling tank, weighing zirconia balls according to a ball-to-material ratio of 4: 1-8: 1, wherein the rotating speed of a ball mill is 400r/min, and the ball milling time is 4-8 h. And ball milling to obtain uniformly dispersed nano heat-insulating powder dispersion slurry. Wherein the mass of the nanometer heat insulation powder accounts for 20-30% of the mass of the dispersed slurry, the mass of the solvent accounts for 61-76% of the mass of the dispersed slurry, and the mass of the dispersant accounts for 4-9% of the mass of the dispersed slurry; the heat insulation powder is one or a mixture of more of lanthanum hexaboride, antimony tin oxide and cesium tungsten bronze powder; the solvent is one or a mixture of more of pure water, ethanol, isopropanol and ethyl acetate; the dispersing agent is one or a mixture of more of polyacrylate, poly fatty acid oligomer and acid group-containing polyester.
Step two, preparing a hydrophilic polymer solution with a certain crosslinking degree;
dispersing polymers rich in carboxyl functional groups and polymers rich in hydroxyl functional groups in a solvent, uniformly stirring for 10-20 min by magnetic force, adding a cross-linking agent, and magnetically stirring for 30-60 min at normal temperature to obtain a hydrophilic polymer solution with a certain cross-linking degree; the mass ratio of the used polymers of the carboxyl functional group and the hydroxyl functional group is 4: 6-3: 7, and the dosage of the cross-linking agent is 8-12% of the total mass of the hydrophilic polymer; the polymer rich in carboxyl functional groups is one or a mixture of more of maleic anhydride, polyacrylic acid, salicylic acid and carboxyl modified polyvinyl alcohol; the polymer rich in hydroxyl functional groups is one or more of polyvinyl alcohol, polypropylene glycol with molecular weight of 200, polypropylene glycol with molecular weight of 400 and polypropylene glycol with molecular weight of 800; the solvent is one or a mixture of more of pure water, ethanol, isopropanol and ethyl acetate; the cross-linking agent is one or a mixture of more of aziridine curing agent, polycarbodiimide cross-linking agent, blocked isocyanate curing agent, gamma-aminopropyl triethoxysilane, gamma-methacryloxypropyl trimethoxysilane and gamma- (2, 3-epoxypropoxy) propyl trimethoxysilane;
step three, preparing a super-hydrophilic transparent coating with heat insulation, antifogging and self-cleaning functions;
uniformly stirring the nano heat insulation powder dispersion slurry obtained in the first step and the hydrophilic polymer and the auxiliary agent with a certain crosslinking degree obtained in the second step, wherein the using mass of the nano heat insulation powder dispersion slurry is 25-30% of the total mass of the polymer solution with a certain crosslinking degree obtained in the second step; the auxiliary agent is one or a mixture of more of an antioxidant, a flatting agent, a defoaming agent, an ultraviolet absorbent and an adhesion promoter; and then, spraying the obtained solution on the surface of a glass substrate, putting the sprayed and coated glass into an oven for drying, and drying to obtain the super-hydrophilic transparent coating with heat insulation, antifogging and self-cleaning functions.
Example 1
Weighing 3g of nano cesium tungsten bronze, 6.1g of ethanol and 0.9g of polyester dispersing agent containing acidic groups, placing the nano cesium tungsten bronze, the ethanol and the polyester dispersing agent containing acidic groups in a ball milling tank, weighing 50g of zirconium oxide beads according to the ball-to-material ratio of 5:1, wherein the rotating speed is 400r/min, and the ball milling time is 4 hours. And (4) carrying out ball milling to obtain nano cesium tungsten bronze dispersion slurry (the solid content of the cesium tungsten bronze is 30%). 0.3g of polyacrylic acid aqueous solution and 0.7g of polypropylene glycol-400 are dispersed in 2.4g of ethanol, after the mixture is uniformly stirred for 10min by magnetic force, 0.08g of gamma-methacryloxypropyltrimethoxysilane is added, and then the mixture is stirred for 30min by magnetic force at normal temperature, thus obtaining the hydrophilic polymer solution with a certain crosslinking degree. And then taking 1g of nano cesium tungsten bronze dispersed slurry to a hydrophilic polymer with a certain crosslinking degree, adding 0.05g of a flatting agent, magnetically stirring for 30min, then spraying the solution on the surface of a glass substrate, putting the sprayed and coated glass into an oven at 80 ℃ for baking for 30min, and drying to obtain the coating.
Example 2
Weighing 2g of nano cesium tungsten bronze, 7.6g of pure water and 0.4g of poly fatty acid oligomer dispersant, placing the mixture in a ball milling tank, weighing 40g of zirconia beads according to a ball-to-material ratio of 4:1, wherein the rotating speed is 400r/min, and the ball milling time is 4 hours. And (4) carrying out ball milling to obtain nano cesium tungsten bronze dispersion slurry (the solid content of the cesium tungsten bronze is 20%). 0.4g of maleic anhydride and 0.6g of polyvinyl alcohol are dispersed in 2.4g of pure water, after the mixture is stirred evenly by magnetic force for 10min, 0.1g of gamma-aminopropyl triethoxysilane is added, and then the mixture is stirred by magnetic force for 30min at normal temperature, thus obtaining the hydrophilic polymer solution with a certain crosslinking degree. And then taking 1g of nano cesium tungsten bronze dispersed slurry to a hydrophilic polymer with a certain crosslinking degree, adding 0.05g of a flatting agent, magnetically stirring for 30min, then spraying the solution on the surface of a glass substrate, putting the sprayed and coated glass into an oven at 80 ℃ for baking for 30min, and drying to obtain the coating.
Example 3
2g of nano tin antimony oxide, 7.6g of ethyl acetate and 0.4g of polyacrylate dispersant are weighed and placed in a ball milling tank, 50g of zirconia beads are weighed according to the ball-to-material ratio of 5:1, the rotating speed is 400r/min, and the ball milling time is 6 hours. And ball milling to obtain nanometer tin antimony oxide dispersion slurry (solid content of tin antimony oxide is 20%). 0.3g of salicylic acid and 0.7g of polypropylene glycol-200 are dispersed in 2.4g of ethyl acetate, after the mixture is uniformly stirred for 10min by magnetic force, 0.1g of gamma-aminopropyltriethoxysilane is added, and then the mixture is stirred for 30min by magnetic force at normal temperature, so that the hydrophilic polymer solution with a certain crosslinking degree is obtained. And then taking 1g of nano tin antimony oxide dispersed slurry into a hydrophilic polymer with a certain crosslinking degree, adding 0.05g of a flatting agent, magnetically stirring for 30min, then spraying the solution on the surface of a glass substrate, putting the sprayed and coated glass into an oven at 80 ℃, baking for 30min, and drying to obtain the coating.
Example 4
Weighing 2g of nano lanthanum hexaboride, 7.4g of isopropanol and 0.6g of poly fatty acid oligomer dispersant, placing the mixture in a ball milling tank, weighing 50g of zirconia beads according to the ball-to-material ratio of 5:1, wherein the rotating speed is 400r/min, and the ball milling time is 8 hours. And ball milling to obtain nanometer lanthanum hexaboride dispersed slurry (the solid content of lanthanum hexaboride is 20%). Dispersing 0.3g of carboxyl modified polyvinyl alcohol and 0.7g of polypropylene glycol-800 in 2.4g of isopropanol, magnetically stirring for 10min to be uniform, then adding 0.12g of polycarbodiimide crosslinking agent, and magnetically stirring for 30min at normal temperature to obtain the hydrophilic polymer solution with a certain crosslinking degree. And then taking 1g of nano lanthanum hexaboride dispersed slurry to a hydrophilic polymer with a certain crosslinking degree, adding 0.05g of a flatting agent, magnetically stirring for 30min, then spraying the solution on the surface of a glass substrate, putting the sprayed and coated glass into an oven at 80 ℃, baking for 30min, and drying to obtain the coating.
Table 1 shows the performance data of the multifunctional superhydrophilic coatings prepared in the respective examples
| Water contact angle | Temperature difference of heat insulation film tester | Self-cleaning effect | Antifogging effect | |
| Example 1 | 5.4° | 15.6℃ | Good taste | Good taste |
| Example 2 | 5.6° | 13.8℃ | Good taste | Good taste |
| Example 3 | 6.2° | 11.2℃ | Good taste | Good taste |
| Example 4 | 5.9° | 10.1℃ | Good taste | Good taste |
The embodiments of the present invention are not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which depart from the spirit of the invention should be construed as equivalents of the invention and are included in the scope of the invention.
Claims (6)
1. A preparation method of a heat-insulating, anti-fog and self-cleaning super-hydrophilic transparent coating is characterized by comprising the following steps:
step one, preparing a nano heat insulation powder slurry dispersion liquid; weighing nanometer heat insulation powder, a solvent and a dispersing agent, placing the nanometer heat insulation powder, the solvent and the dispersing agent in a ball milling tank, weighing zirconia balls according to a ball-to-material ratio of 4: 1-8: 1, wherein the rotating speed of a ball mill is 400r/min, and the ball milling time is 4-8 h; ball milling to obtain nanometer heat insulating powder dispersed slurry; wherein the mass of the nanometer heat-insulating powder accounts for 20-30% of the mass of the dispersed slurry, the mass of the solvent accounts for 61-76% of the mass of the dispersed slurry, and the mass of the dispersant accounts for 4-9% of the mass of the dispersed slurry;
step two, preparing a hydrophilic polymer solution with a certain crosslinking degree; dispersing the polymer rich in carboxyl functional groups and hydroxyl functional groups in a solvent, uniformly stirring by magnetic force, adding a cross-linking agent, and magnetically stirring at normal temperature to obtain a hydrophilic polymer solution with a certain cross-linking degree; the mass ratio of the polymer containing the carboxyl functional group to the polymer containing the hydroxyl functional group is 4: 6-3: 7; the mass of the cross-linking agent is 8-12% of the total mass of the polymer;
step three, preparing a super-hydrophilic transparent coating with heat insulation, antifogging and self-cleaning functions; uniformly stirring the nano heat insulation powder dispersion slurry obtained in the first step and the hydrophilic polymer and the auxiliary agent with a certain crosslinking degree obtained in the second step, then spraying the obtained solution on the surface of a glass substrate, putting the sprayed and coated glass into an oven for drying, and drying to obtain a super-hydrophilic transparent coating with heat insulation, antifogging and self-cleaning functions; the addition of the nano heat-insulating powder dispersion slurry improves the surface roughness of the coating, so that the hydrophilic polymer coating added with the cross-linking agent is changed from non-super-hydrophilicity to super-hydrophilicity;
the mass fraction of the polymer rich in carboxyl functional groups accounts for 6-10% of the coating system, the mass fraction of the polymer rich in hydroxyl functional groups accounts for 12-18% of the coating system, the mass fraction of the solvent accounts for 45-55% of the coating system, the mass fraction of the cross-linking agent accounts for 2-4% of the coating system, the mass fraction of the nano heat-insulating powder dispersion slurry accounts for 20-25% of the coating system, and the mass fraction of the auxiliary agent accounts for 0.5-3% of the coating system; the polymer rich in carboxyl functional groups is one or a mixture of polyacrylic acid and carboxyl modified polyvinyl alcohol; the polymer rich in hydroxyl functional groups is one or more of polyvinyl alcohol, polypropylene glycol with molecular weight of 200, polypropylene glycol with molecular weight of 400 and polypropylene glycol with molecular weight of 800.
2. The method for preparing the super-hydrophilic transparent coating with the functions of heat insulation, anti-fog and self-cleaning according to claim 1, wherein in the first step and the second step, the solvent is one or more of pure water, ethanol and isopropanol.
3. The method for preparing the heat-insulating antifogging self-cleaning super-hydrophilic transparent coating according to claim 1, characterized in that in step one, the nano heat-insulating powder is one or a mixture of several of lanthanum hexaboride, antimony tin oxide and cesium tungsten bronze powder.
4. The method for preparing the super-hydrophilic transparent coating with the functions of heat insulation, fog prevention and self cleaning according to claim 1, wherein in the step one, the dispersing agent is one or a mixture of polyacrylate, poly fatty acid oligomer and acid group-containing polyester.
5. The method for preparing the super hydrophilic transparent coating with heat insulation, antifogging and self-cleaning functions as claimed in claim 1, wherein in the second step, the cross-linking agent is one or a mixture of aziridine curing agent, polycarbodiimide cross-linking agent, blocked isocyanate curing agent, gamma-aminopropyl triethoxysilane, gamma-methacryloxypropyl trimethoxysilane and gamma- (2, 3-epoxypropoxy) propyl trimethoxysilane.
6. The method for preparing the heat-insulating anti-fog self-cleaning super-hydrophilic transparent coating according to claim 1, wherein in the third step, the auxiliary agent is one or a mixture of several of an antioxidant, a leveling agent, a defoaming agent, an ultraviolet absorbent and an adhesion promoter.
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| CN115785813B (en) * | 2022-11-25 | 2023-08-15 | 东莞理工学院 | Super-hydrophilic porous coating with changeable transparency, preparation method and application thereof |
| CN117143487A (en) * | 2023-09-05 | 2023-12-01 | 广东中城海创新材料有限公司 | Glass heat-insulating film for removing formaldehyde by negative ions and preparation method thereof |
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