CN115322597A - Lotus leaf structure-imitated self-cleaning ceramic coating and preparation and application methods thereof - Google Patents
Lotus leaf structure-imitated self-cleaning ceramic coating and preparation and application methods thereof Download PDFInfo
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Abstract
The invention discloses a lotus leaf structure-imitated self-cleaning ceramic coating and a preparation and application method thereof; comprises the following components by the total weight of 100 percent: silica sol: 25-27%,1% naoh solution: 4-5%, pigment: 10-12%, filler: 8-10%, dispersant: 1-1.2%, silane: 25-27%, isopropanol: 3-3.5%, silicone oil microcapsule: 6-8%,25% formic acid: 0.7-1%, deionized water: and (4) the balance. By forming a micron-nanometer secondary roughness structure on the surface of the ceramic coating and preparing the silicone oil microcapsule with a shell-core structure, the water contact angle of the ceramic coating is larger than 150 degrees, the rolling angle is larger than 140 degrees, and the silicone oil microcapsule has excellent super-hydrophobicity, self-cleaning property and good durability.
Description
Technical Field
The invention belongs to the technical field of coatings, and relates to a lotus leaf structure-imitated self-cleaning ceramic coating and a preparation and application method thereof.
Background
When water drops on the lotus leaves, approximately spherical water beads are formed on the lotus leaves and roll off without soaking the lotus leaves, and the observation of an electron microscope shows that the surfaces of the lotus leaves have micron-sized micro protrusions, and the micron-sized protrusions form a nano-sized protrusion and are of a micron-nano secondary protrusion structure. The structure enables the water drops to adsorb dust on the surface of the blade in the rolling process and roll out of the blade surface, thereby achieving the effect of cleaning the blade surface. The technology of imitating lotus leaves has penetrated into various industries and fields of textile, chemical industry and the like. Various super-hydrophobic self-cleaning surfaces are manufactured by imitating a lotus leaf structure, so that the manual maintenance cost can be reduced.
At present, the materials commonly used for constructing the super-hydrophobic surface comprise low-surface-energy organic matters such as polytetrafluoroethylene, fluorosilane and stearic acid, but the organic matters often face a plurality of problems, such as higher VOC (volatile organic compound) emission, friction resistance, weakened super-hydrophobicity at high temperature, even loss and the like, so that the use scene is limited. The ceramic coating is a coating with a Si-O-Si inorganic structure, is a safe and environment-friendly material with good high temperature resistance and good wear resistance, and contains a small amount of-CH on the surface 3 The groups have hydrophobicity, but the water contact angle on the surface of the ceramic coating can only reach about 100 degrees, and the ceramic coating cannot be used as a super-hydrophobic self-cleaning coating.
The technical means for forming the micron-nanometer secondary structure on the lotus leaf-imitated surface comprises a template method, a laser etching method, a chemical vapor deposition method, a phase separation and self-assembly method and the like, and the retrieval of the existing patent documents shows that Chinese invention patent with the application number of 202010751086.7 discloses a technical scheme for forming the lotus leaf-imitated super-hydrophobic surface, and the lotus leaf-imitated super-hydrophobic surface is formed by the template method, so that the technical means has a large difference from the traditional construction process of paint, and is not suitable for large-area industrial production; the Chinese patent with application number 202210049774.8 discloses a preparation method and application of a lotus leaf-like super-hydrophobic coating, wherein a lotus leaf-like structure is formed by adopting a high-voltage electrostatic spraying method, but under the condition of fixed voltage in electrostatic spraying, the electric field force borne by coating particles is constant, and the force of the electric field force acting on each coating particle is the same, so that the particles cannot move directionally to form the lotus leaf-like structure. The key point of preparing the lotus leaf-like structure-imitated super-hydrophobic self-cleaning coating is how to adopt a technical means which is close to and can be realized by a coating construction process.
Disclosure of Invention
The method close to the coating construction process is adopted to form a lotus leaf-like micron-nanometer secondary structure on the surface of the ceramic coating to prepare the self-cleaning super-hydrophobic coating, and the key technical problem to be solved is that the self-cleaning performance of the coating is good in durability. The invention provides a lotus leaf structure-imitated self-cleaning ceramic coating and a preparation and construction method thereof.
The purpose of the invention is realized by the following technical scheme:
< first aspect >
The invention relates to a self-cleaning ceramic coating composition for forming a lotus leaf-like structure, which comprises the following components in percentage by weight based on 100 percent:
silica sol: 25-27%,1% naoh solution: 4-5%, pigment: 10-12%, filler: 8-10%, dispersant: 1-1.2%, silane: 25-27%, isopropyl alcohol: 3-3.5%, silicone oil microcapsule: 6-8%,25% formic acid: 0.7-1%, deionized water: and (4) the balance.
In the system of the invention, the silica sol is a main film forming material of the ceramic coating, and is a common commercial product, such as: bindzil 2034DI from Acksonobel, nissan chemical ST-O-40, grace
HS-40 and the like.
1 percent of NaOH solution is used as a color paste pH regulator to regulate the pH of the color paste portion to 9-10.5, the pH of the color paste portion decreases during storage after the color paste is ground by silica sol, and when the pH drops to below 8.5 and is close to neutral, the silica sol undergoes gelation to cause color paste deterioration, so that the pH of the color paste needs to be regulated to 9-10 by an alkaline solution to ensure that the color paste does not deteriorate during storage.
The pigment endows the paint with different colors, and the common inorganic pigment is selected, so that the inorganic pigment has good temperature resistance and good safety, and the inorganic pigment is preferably selected in the field of high temperature resistance.
The filler plays a role in reducing the cost of the coating, increasing the solid content of the coating and the like, and common fillers are selected, such as: mica powder, silicon micropowder, kaolin, alumina powder, fumed silica and the like.
The dispersant functions to reduce the time for dispersing the pigment filler, stabilize the pigment dispersion, improve the coloring power and hiding power of the pigment, and the like, for example: BYK180, BYK190, BYK2010, BYK2001, etc.
Silane is used as auxiliary film-forming material, and methyl trimethoxy silane, methyl triethoxy silane, dimethyl dimethoxy silane, etc. can be used.
The silicone oil microcapsule is a component for providing hydrophobicity of the ceramic coating, is a microcapsule with a shell-core structure, and silicone oil can gradually diffuse out of the shell structure in the heating process of the coating, so that the silicone oil microcapsule is slowly released, and the hydrophobicity durability of the coating is prolonged.
The 25% formic acid solution is used as the catalyst of the sol-gel reaction of the ceramic coating, and silane is hydrolyzed under the acidic condition and then undergoes the polycondensation reaction with the silica sol to generate the ceramic coating.
The total weight of the silicone oil microcapsule is 100 percent, and the silicone oil microcapsule has the following formula:
silicone oil: 43-45 percent of the total weight of the mixture,
silane: 48 to 50 percent of the total weight of the mixture,
surfactant (b): 4 to 4.5 percent of the total weight of the mixture,
25% formic acid solution: and (4) the balance.
In silicone oil microcapsules, silicone oils are used to provide hydrophobicity to ceramic coatings, and silicone oils are commonly used, such as: methyl silicone oil, hydroxy silicone oil, and the like.
The silane is prepared from 1:1-2:1 and a difunctional silane. The trifunctional silane is short-chain trifunctional silane and comprises methyltrimethoxysilane and methyltriethoxysilane; the difunctional silane is a short-chain difunctional silane and comprises dimethyl dimethoxy silane, dimethyl diethoxy silane and the like. In the system, trifunctional silane and difunctional silane are matched for use, a regular porous structure with a three-dimensional crosslinking structure can be formed, the diameter of a hole is larger, the diffusion of silicone oil molecules is facilitated, and if the trifunctional silane is selected completely, the formed crosslinking structure is compact, the hole diameter is smaller, and the outward diffusion of the silicone oil molecules is not facilitated. The silane with short chain alkyl can avoid the steric hindrance effect from appearing in the early polymerization process, so that the shell structure is more complete and regular, and the silane with long chain alkyl is difficult to form the complete shell structure during the polymerization process due to the fact that the steric hindrance effect is easily generated.
The surfactant is cationic surfactant, and can stably exist under weak acidic condition. For example: surfactants with organic quaternary ammonium salt structure such as cetyl trimethyl quaternary ammonium bromide, octadecyl dimethyl benzyl quaternary ammonium chloride, benzalkonium chloride and benzalkonium bromide. In the system, if an anionic activator is added, a gel phenomenon can be generated; if a nonionic surfactant is added, the stabilizing effect is poor.
The 25% formic acid solution is a catalyst for silane hydrolysis, and the silane can be hydrolyzed under acidic conditions to form a colorless transparent solution.
As an embodiment, the preparation of the silicone oil microcapsule comprises the steps of: mixing silicone oil, silane and surfactant uniformly, adjusting pH to 4.0-5.0 with 25% formic acid under stirring, reacting for 4-6hr, and performing ultrasonic treatment for 2-3hr to obtain silicone oil microcapsule.
The prepared microcapsule is of a shell-core structure, wherein the shell is a three-dimensional cross-linked network structure of Si-O-Si formed by hydrolytic polymerization of silane under an acidic condition, and the core is silicone oil emulsified by a surfactant. The reticular shell structure can make the silicon oil molecules inside slowly diffuse outwards.
Due to the action of the surfactant, the silicone oil microcapsules can be uniformly dispersed in the coating and can also be uniformly distributed in the coating after being cured, and when the upper silicone oil (the microcapsules are uniformly distributed in the coating and the silicone oil microcapsules are also arranged on the upper layer) loses action in the using process, the silicone oil in the coating can be slowly diffused out to continuously exert hydrophobicity, so that the long-acting hydrophobicity of the coating is ensured. If the silicone oil is directly added into the ceramic coating, the silicone oil has low density and poor compatibility with the water-based coating, and only floats on the surface of the coating, and after curing and film forming, the silicone oil is also positioned on the surface layer of the coating, and once losing effect, the hydrophobicity is reduced, so that the hydrophobicity durability of the directly added silicone oil coating is poor.
The step adopts a mode of stirring for reaction for 4-6 hours and then carrying out ultrasonic treatment for 2 hours, the reaction under stirring takes the generation of a shell structure as the main part, the silicone oil and the surfactant are combined preliminarily, and the silicone oil and the surfactant are further emulsified under the ultrasonic treatment to form uniform and stable silicone oil microcapsule dispersion liquid.
As one embodiment, the coating of the present invention is applied to a substrate having a surface with a micro-nano secondary roughness structure. The surface of the base material is firstly formed with a micron-sized convex rough surface with Ra of 2-5 mu m, and then a nano-sized rough structure with Ra of 200-400nm is formed on the surface.
< second aspect >
The invention relates to a preparation method of a self-cleaning ceramic coating composition for forming a lotus leaf-like structure, which comprises the following steps:
s1, color paste preparation: mixing silica sol, pigment, filler, dispersant and deionized water uniformly, adjusting pH to 9.5-10.5 with 1% NaOH solution, and grinding to fineness of 20 μm or less;
s2, preparing a ceramic coating: uniformly mixing silane, isopropanol, silicone oil microcapsules and 25% formic acid; and adding the color paste prepared in the step S1, uniformly mixing, and reacting for 4-8 hours to obtain the ceramic coating.
As an embodiment, in step S2, after grinding to a fineness of 20 μm or less, the pH of the mill base is again measured and, if less than 9.0%, adjusted to between 9.0 and 10.0 with 1% NaOH solution.
< third aspect >
The invention relates to a construction method of a self-cleaning ceramic coating composition for forming a lotus leaf-like structure; the method comprises the following steps:
a1, pretreatment: performing shot blasting treatment on a metal substrate by using 60-mesh steel shots, forming roughness Ra of 3-8 mu m on the surface of the substrate, constructing a micron-sized convex rough surface, performing sand blasting treatment by using 400-mesh corundum, and forming a nano-scale rough structure with Ra of 200-400nm on the micron-sized convex rough surface;
a2, preheating a base material: cleaning the pretreated base material, and preheating to 50-60 ℃;
a3, spraying: spraying construction is carried out when the temperature of the base material is 50-60 ℃;
a4, curing: baking at 180-230 deg.C for 15-20 min to complete curing.
In the step A1, the metal base material is selected from metal plates such as aluminum alloy, galvanized steel plates, nickel-plated steel plates and the like. Through the two pretreatment processes of the step A1, a micron-nanometer secondary structure similar to the lotus leaf surface can be formed on the surface of the base material.
The control of the preheating temperature of the base material in the steps A2 and A3 is very important. That is, the coating of the present invention is applied by preheating the substrate to 50-60 ℃. When the coating contacts the preheated surface of the base material, the fluidity is slowed down, and the coating is initially cured without being in time to level, so that the micro-nano secondary coarse structure formed on the surface of the base material is kept; if the base material is not preheated, the coating tends to flow and level when sprayed at normal temperature, and the coating is filled into the concave part of the rough surface, so that the nano-scale rough structure disappears and a micron-nano secondary structure cannot be formed; if the preheating temperature of the substrate is too high, the coating can have the defects of drying, light loss and the like.
And D, directly curing at high temperature after spraying in the step A4, so that the coating can be quickly cured to form a coating with a micron-nanometer secondary structure. The thickness of the coating cannot be too thick, otherwise, the curing speed is slow, and the nano-scale structure on the surface disappears; too thin a coating also causes the defects of drying and light loss.
In one embodiment, in step A4, the coating thickness after curing is from 20 to 30 μm.
Compared with the prior art, the invention has the following beneficial effects:
(1) Steel shots and corundum sand with different grain diameters are adopted, a micron-nanometer secondary roughness structure similar to a lotus leaf is constructed on the surface of a base material through two pretreatment processes of shot blasting and sand blasting, and a ceramic coating with a lotus leaf-like structure is formed by controlling the preheating temperature and the curing temperature of the base material and the thickness of the ceramic coating; the construction process and method provided by the invention are simple and easy to implement, have short required time and are suitable for large-area industrial production.
(2) The silicone oil microcapsule with a shell-core structure is prepared by a hydrolytic polymerization technology of silane and an emulsification technology of a surfactant on silicone oil, wherein the shell is a three-dimensional cross-linked porous structure of Si-O-Si formed by hydrolytic polymerization of silane, and the core is silicone oil emulsified by the surfactant, so that the silicone oil and the water-based ceramic coating have good compatibility, can be uniformly dispersed in the whole ceramic coating, and can be uniformly distributed in the whole coating after being cured. In the using process, the silicone oil can slowly diffuse out of the shell structure, the hydrophobicity of the coating is continuously exerted, and the self-cleaning effect is achieved; the silicone oil microcapsule with a shell-core structure can also increase the addition of silicone oil, and improve the self-cleaning durability of the coating.
(3) The micron-nanometer secondary roughness structure is formed on the surface of the ceramic coating and the silicone oil microcapsule with the shell-core structure is prepared, so that the water contact angle of the ceramic coating is larger than 150 degrees, the ceramic coating has excellent super-hydrophobicity and self-cleaning property, and the durability is good.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
FIG. 1 is a schematic diagram of a network structure of a silicone oil microcapsule;
fig. 2 is a schematic view of a coating micro-nano structure.
Detailed Description
The present invention will be described in detail with reference to examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that numerous modifications and adaptations can be made by those skilled in the art without departing from the inventive concepts herein. All falling within the scope of the present invention.
Examples 1 to 3
The embodiments 1 to 3 provide a self-cleaning ceramic coating composition for forming a lotus leaf-like structure; the composition of the composition is shown in table 1.
The preparation steps of the self-cleaning ceramic coating of the embodiment are as follows:
(1) Color paste preparation: mixing silica sol, pigment, filler, dispersant and deionized water, adjusting pH to 10 with 1% NaOH solution, grinding to fineness below 20 μm, testing pH of the color paste, and adjusting pH to 10.0 with 1% NaOH solution if less than 9.0.
(2) Preparing a ceramic coating: uniformly mixing silane, isopropanol, silicone oil microcapsules and 25% formic acid, measuring and recording the pH value of the solution, then adding the color paste prepared in the step (1), uniformly mixing, reacting on a roller frame for 4-8 hours to obtain the ceramic coating, and measuring and recording the pH value.
The construction steps of the self-cleaning ceramic coating of the embodiment are as follows:
(1) The pretreatment process comprises the following steps: the base material is a galvanized steel plate, shot blasting is carried out by using a steel shot of 60 meshes, the surface of the base material forms roughness with Ra of 3-8 mu m, a micron-sized convex rough surface is constructed, then sand blasting is carried out by using corundum of 400 meshes, and a nano-scale rough structure with Ra of 300nm is formed on the micron-sized convex rough surface.
(2) Preheating a base material: cleaning the pretreated substrate with tap water, putting the substrate into an oven, and preheating the substrate to 55 ℃;
(3) Spraying: spraying construction is carried out under the condition that the temperature of the base material is 55 ℃;
(4) And (3) curing: baking at 210 deg.C for 20 min to complete curing, and coating thickness of 20-30 μm after curing.
FIG. 2 is a schematic view of the micro-nano structure of the cured coating, and it can be seen from FIG. 2 that the coating forms a primary coarse structure of 2-5 μm, and forms a secondary coarse structure of 100-150nm on the surface of the micro-structure, which is a micro-nano secondary coarse structure similar to lotus leaves.
The coating prepared in example 1 was subjected to the above-described construction, and the following adjustments were made: the spraying is carried out at normal temperature, and as a result, the following results are found: the coating has sagging phenomenon.
The coating prepared in example 1 was subjected to the above-described construction, and adjusted: the spraying was carried out at 70 ℃ and as a result it was found that: the coating has the film defects of drying, rough surface, light loss and the like.
The coating prepared in example 1 was subjected to the above-described construction, and adjusted: the thickness of the coating layer sprayed was 50 μm, and as a result, it was found that: the surface nano-roughness disappears, and the contact angle and the rolling angle become smaller.
The coating prepared in example 1 was subjected to the above-described construction, and the following adjustments were made: the curing temperature was 150 ℃ and as a result, it was found that: baking was required for 40 minutes to achieve the same hardness.
The coating prepared in example 1 was subjected to the above-described construction, and the following adjustments were made: the surface of the base material is formed with roughness Ra of 3 μm during pretreatment, and the base material is formed into a micron-sized convex rough surface. The performance test results show that: the contact angle and the rolling angle become small.
The coating prepared in example 1 was subjected to the above-described construction, and the following adjustments were made: during pretreatment, the surface of the base material is directly subjected to sand blasting treatment by using corundum of 400 meshes to form a nano-scale rough structure with Ra of 300 nm. The performance test results show that: the contact angle and the rolling angle become small.
Comparative examples 1 to 6
Comparative examples 1-6 provide ceramic coating compositions; the composition of the composition is shown in table 1.
The preparation and construction method of the ceramic coating are the same as in example 1.
Comparative example 7
Comparative example 7 provides a ceramic coating composition; the composition of the composition is shown in table 1.
The application method of the ceramic coating is the same as that of example 1.
The preparation steps of the ceramic coating are as follows:
(1) Color paste preparation: mixing silica sol, pigment, filler, dispersant and deionized water, adjusting pH to 10 with 1% NaOH solution, grinding to fineness below 20 μm, testing pH of the color paste, and adjusting pH to 10.0 with 1% NaOH solution if less than 9.0.
(2) Preparing a ceramic coating: uniformly mixing silane 1, hydroxyl silicone oil, surfactant cetyl trimethyl ammonium bromide, isopropanol and 25% formic acid, measuring and recording the pH value of the solution, then adding the color paste prepared in the step (1), uniformly mixing, reacting on a roller frame for 4-8 hours to obtain a ceramic coating, and measuring and recording the pH value.
The construction steps of the self-cleaning ceramic paint of the embodiment are as follows:
(1) The pretreatment process comprises the following steps: the base material is a galvanized steel plate, shot blasting is carried out by using a steel shot with 60 meshes, the roughness Ra of the base material surface is 3 mu m, a micron-scale convex rough surface is formed, then sand blasting is carried out by using corundum with 400 meshes, and a nano-scale rough structure with the Ra of 300nm is formed on the micron-scale convex rough surface.
(2) Preheating a base material: cleaning the pretreated substrate with tap water, putting the substrate into an oven, and preheating the substrate to 55 ℃;
(3) Spraying: spraying construction is carried out under the condition that the temperature of the base material is 55 ℃;
(4) And (3) curing: baking at 210 ℃ for 20 minutes to complete curing, wherein the coating thickness is 25 mu m.
Table 1 coating composition and amount (wt.%) of examples and comparative examples
In the context of table 1, the following,
the silica sol 1 is Bindzil 2034DI of Aksu Nobel;
silica sol 2 is Grace
HS-40；
The pigment is titanium dioxide;
silane 1 is methyl trimethoxy silane and dimethyl diethoxy silane with the mass ratio of 1;
silicone oil microcapsule 1: uniformly mixing hydroxyl silicone oil, silane 1 and hexadecyl trimethyl ammonium bromide, adjusting the pH value to 4.5 with 25% formic acid under stirring, reacting for 5hr, and performing ultrasonic treatment for 3hr to obtain silicone oil microcapsule 1; wherein, 45% of silicone oil, 148% of silane, 4% of surfactant and the balance of 25% formic acid solution;
fig. 1 is a schematic diagram of a network structure of a silicone oil microcapsule 1, and as can be seen from fig. 1, the silicone oil microcapsule is a shell-core structure, the shell is a relatively uniform and regular network structure, the diameter of the mesh is about 100-300nm, and during heating, silicone oil molecules inside can be gradually released from the gaps to continuously provide non-adhesiveness for the coating.
Silicone oil microcapsule 2: uniformly mixing hydroxyl silicone oil, silane 2 (dimethyldimethoxysilane and dimethyldiethoxysilane in a mass ratio of 1; wherein, 45% of silicone oil, 248% of silane, 4% of surfactant and the balance of 25% formic acid solution;
silicone oil microcapsule 3: uniformly mixing hydroxyl silicone oil, silane 3 (methyl trimethoxy silane and methyl triethoxy silane with the mass ratio of 1; wherein, 45% of silicone oil, 3% of silane, 4% of surfactant and the balance of 25% formic acid solution;
silicone oil microcapsule 4: uniformly mixing hydroxyl silicone oil, silane 4 (hexadecyl trimethoxy silane and dimethyl diethoxy silane with the mass ratio of 1; 45% of silicone oil, 148% of silane, 4% of surfactant and the balance of 25% formic acid solution.
Silicone oil microcapsule 5: 0.25 g of sodium dodecyl sulfate and 0.75 g of alkylphenol polyoxyethylene are dissolved in 100 g of deionized water, then an oil phase mixture consisting of 10 g of dimethyl silicone oil, 10 g of TEOS and 1.5 g of octadecyl trimethoxy silane is added, pre-emulsification and stirring are carried out for 15 minutes in an ice water bath environment, and then ultrasonic fine emulsification is carried out for 20 minutes by using a cell crusher to obtain the miniemulsion. Adjusting the pH value of the miniemulsion to 7.5, and stirring at high speed for 24 hours at normal temperature to obtain milky white silicone oil microcapsules 5;
silicone oil microcapsule 6: uniformly mixing hydroxyl silicone oil, silane 1 and hexadecyl trimethyl ammonium bromide, adjusting the pH value to 4.5 by using 25% formic acid under the stirring state, and stirring for reacting for 8hr to obtain a silicone oil microcapsule 6; wherein, 45% of silicone oil, 148% of silane, 4% of surfactant and the balance of 25% formic acid solution;
silicone oil microcapsule 7: uniformly mixing hydroxyl silicone oil, silane 1 and hexadecyl trimethyl ammonium bromide, adjusting the pH value to 4.5 by using 25% formic acid under the stirring state, and performing ultrasonic treatment for 8hr to obtain a silicone oil microcapsule 7; wherein, 45% of silicone oil, 148% of silane, 4% of surfactant and the balance of 25% formic acid solution.
Measurement of Primary Properties
The main performance tests, the test items and the methods of the coatings prepared in the above examples and comparative examples are shown in Table 2, and the test results are shown in tables 3 to 5:
TABLE 2
TABLE 3
TABLE 4
TABLE 5
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes and modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention.
Claims (10)
1. The self-cleaning ceramic coating composition for forming the lotus leaf-like structure is characterized by comprising the following components in percentage by weight based on 100 percent:
silica sol: 25-27%,1% naoh solution: 4-5%, pigment: 10-12%, filler: 8-10%, dispersant: 1-1.2%, silane: 25-27%, isopropyl alcohol: 3-3.5%, silicone oil microcapsule: 6-8%,25% formic acid: 0.7-1%, deionized water: and the balance.
2. The self-cleaning ceramic coating composition for forming the lotus leaf-like structure as claimed in claim 1, wherein the filler is selected from one or more of mica powder, silica micropowder, kaolin, alumina powder and fumed silica; the pigment is an inorganic pigment; the dispersing agent is selected from one or more of BYK180, BYK190, BYK2010 and BYK 2001.
3. The self-cleaning ceramic coating composition for forming the lotus leaf-like structure as claimed in claim 1, wherein the silane is selected from one or more of methyltrimethoxysilane, methyltriethoxysilane and dimethyldimethoxysilane.
4. The self-cleaning ceramic coating composition for forming a lotus leaf-like structure according to claim 1, wherein the silicone oil microcapsule is formulated as follows, based on 100% of the total weight of the silicone oil microcapsule:
silicone oil: 43 to 45 percent of the total weight of the mixture,
silane: 48 to 50 percent of the total weight of the mixture,
surfactant (b): 4-4.5 percent of the total weight of the mixture,
25% formic acid solution: and (4) the balance.
5. The self-cleaning ceramic coating composition for forming the lotus leaf-like structure as claimed in claim 4, wherein in the silicone oil microcapsule, the silicone oil is selected from one or more of methyl silicone oil and hydroxyl silicone oil; the silane consists of 1:1-2:1 and a difunctional silane.
6. The self-cleaning ceramic coating composition for forming the lotus leaf-like structure as claimed in claim 4, wherein the surfactant in the silicone oil microcapsule is selected from cationic surfactants, including one or more of cetyl trimethyl quaternary ammonium bromide, octadecyl dimethyl benzyl quaternary ammonium chloride, benzalkonium chloride and benzalkonium bromide.
7. The self-cleaning ceramic coating composition for forming a lotus leaf-like structure according to claim 4, wherein the silicone oil microcapsule is prepared by the following steps: mixing silicon oil, silane and surfactant uniformly, adjusting pH to 4.0-5.0 with 25% formic acid under stirring, reacting for 4-6hr, and ultrasonic treating for 2-3hr to obtain silicon oil microcapsule.
8. A method of preparing the self-cleaning ceramic coating composition for forming a simulated lotus leaf structure of claim 1, wherein the method comprises the steps of:
s1, color paste preparation: uniformly mixing silica sol, pigment, filler, dispersant and deionized water, adjusting the pH value to 9.5-10.5 by using 1 percent of NaOH solution, and grinding the mixture to the fineness of less than 20 mu m;
s2, preparing a ceramic coating: uniformly mixing silane, isopropanol, silicone oil microcapsules and 25% formic acid; and adding the color paste prepared in the step S1, uniformly mixing, and reacting for 4-8 hours to obtain the ceramic coating.
9. The method of claim 8, wherein in step S2, after grinding to a fineness of 20 μm or less, the pH of the color paste is tested and adjusted to between 9.0-10.0% with 1% naoh solution if less than 9.0.
10. A construction method for forming the lotus leaf-like structure-imitated self-cleaning ceramic coating composition according to claim 1; the method is characterized by comprising the following steps:
a1, pretreatment: performing shot blasting treatment on a metal substrate by using a 60-mesh steel shot, forming a roughness Ra of 2-5 mu m on the surface of the substrate, constructing a micro-scale convex rough surface, performing sand blasting treatment by using 400-mesh corundum, and forming a nano-scale rough structure with Ra of 200-400nm on the micro-scale convex rough surface;
a2, preheating a base material: cleaning the pretreated base material, and preheating to 50-60 ℃;
a3, spraying: spraying construction is carried out on the base material at the temperature of 50-60 ℃;
a4, curing: baking at 180-230 deg.C for 15-20 min to complete curing, and coating thickness of 20-30 μm after curing.
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| CN202211048052.7A CN115322597B (en) | 2022-08-30 | 2022-08-30 | Self-cleaning ceramic coating with lotus leaf-like structure and preparation and application methods thereof |
| PCT/CN2023/113331 WO2024046129A1 (en) | 2022-08-30 | 2023-08-16 | Self-cleaning ceramic coating of lotus-leaf-like structure, preparation method therefor and application method thereof |
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| WO2024046129A1 (en) * | 2022-08-30 | 2024-03-07 | 上海宜瓷龙新材料股份有限公司 | Self-cleaning ceramic coating of lotus-leaf-like structure, preparation method therefor and application method thereof |
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