CN112500747A - Self-cleaning weather-resistant fluorocarbon aluminum veneer and preparation method thereof - Google Patents
Self-cleaning weather-resistant fluorocarbon aluminum veneer and preparation method thereof Download PDFInfo
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Abstract
The application relates to the field of aluminum veneers, and specifically discloses a self-cleaning weather-resistant fluorocarbon aluminum veneer and a preparation method thereof, the self-cleaning weather-resistant fluorocarbon aluminum veneer comprises a fluorocarbon coating and a self-cleaning coating which are sequentially coated from inside to outside, the fluorocarbon coating is prepared by curing after being coated by fluorocarbon paint, and the fluorocarbon paint comprises the following substances in parts by weight: 45-50 parts of fluorocarbon resin, 0.1-0.3 part of dispersing agent, 3-5 parts of amino resin, 1-2 parts of isocyanate, 0.2-0.5 part of flatting agent, 15-30 parts of white carbon black and 60-100 parts of methyl isobutyl ketone. This application has optimized the coating structure between fluorocarbon coating and the automatically cleaning coating to add the size effect of the micro-nano structure that white carbon black formed for modified material in the fluorocarbon coating is inside, overcome the low not good problem that leads to the automatically cleaning performance of the bonding strength of automatically cleaning type fluorocarbon aluminum veneer surface automatically cleaning coating of waiting type.
Description
Technical Field
The application relates to the field of aluminum veneers, in particular to a self-cleaning weather-resistant fluorocarbon aluminum veneer and a preparation method thereof.
Background
The fluorocarbon aluminum veneer is a generic name of a series of aluminum veneers which take aluminum-containing veneers as primary coating substrates, and a novel coating aluminum veneer which is researched and produced on the basis of the aluminum veneers is known in the industry as aluminum veneer king because the novel coating aluminum veneer has excellent characteristics of strong weather resistance, chemical medium corrosion resistance and the like. However, with the development of economy, environmental pollution is serious, and a great amount of dirt adheres to the surface of the fluorocarbon aluminum veneer after long-term use, so that the fluorocarbon aluminum veneer needs to be cleaned regularly and regularly. The cleaning agent not only consumes manpower and material resources, but also has the dangers of high-altitude operation and the like, and simultaneously has the problems of secondary pollution and the like caused by using the cleaning agent.
The related technology can refer to Chinese invention patent with publication number CN102587610B, and discloses a preparation method of a visible light response self-cleaning fluorocarbon aluminum single plate coated with a nitrogen-doped nano titanium dioxide film on the surface, which is mainly characterized in that the nitrogen-doped nano titanium dioxide film coated on the surface of the fluorocarbon aluminum single plate is exposed outdoors, has super-hydrophilicity after natural illumination, and the pollution attached to the coating surface can be washed away by rainwater. On the other hand, the nitrogen-doped nano titanium dioxide film has a photocatalytic property after being naturally illuminated, and can effectively degrade organic pollutants remained on the surface of the aluminum plate.
In view of the above-mentioned related technologies, the inventor believes that the scheme of disposing the self-cleaning nano titanium dioxide film on the surface of the fluorocarbon coating can improve the self-cleaning performance of the coating to a certain extent, but the surface energy of the fluorocarbon coating is low, and the coated nano titanium dioxide coating has low bonding strength and is easy to fall off or crack, thereby reducing the self-cleaning performance of the fluorocarbon aluminum single plate.
Disclosure of Invention
In order to overcome the low not good problem that leads to self-cleaning performance of the bonding strength of the type fluorocarbon aluminum veneer surface self-cleaning coating of nai time of automatically cleaning, this application provides a type fluorocarbon aluminum veneer that nai time of automatically cleaning, adopts following technical scheme:
in a first aspect, the present application provides a self-cleaning weather-resistant fluorocarbon aluminum veneer, which adopts the following technical scheme:
the self-cleaning weather-resistant fluorocarbon aluminum veneer comprises a fluorocarbon coating and a self-cleaning coating which are sequentially coated from inside to outside, wherein the fluorocarbon coating is prepared by coating a fluorocarbon coating and then curing the fluorocarbon coating, and the fluorocarbon coating comprises the following substances in parts by weight: 45-50 parts of fluorocarbon resin, 0.1-0.3 part of dispersing agent, 3-5 parts of amino resin, 1-2 parts of isocyanate, 0.2-0.5 part of flatting agent, 15-30 parts of white carbon black and 60-100 parts of methyl isobutyl ketone.
Through adopting above-mentioned technical scheme, because this application has optimized the coating structure between fluorocarbon coating and the automatically cleaning coating to add white carbon black in the fluorocarbon coating is modified material in inside, because white carbon black has good nanometer size and is less than, add it to the coating and handle, make fluorocarbon coating surface form micro-nano structure's size effect, thereby make the automatically cleaning coating when the coating, have good bonding strength, thereby overcome the low not good problem that leads to the automatically cleaning performance of the bonding strength of the type fluorocarbon aluminum veneer surface automatically cleaning coating of automatically cleaning resistant type.
Further, the self-cleaning coating comprises the following substances in parts by weight:
45-50 parts of titanium dioxide sol solution, 15-20 parts of potassium silicate solution, 25-30 parts of silicon dioxide sol, 3-5 parts of wetting agent and 4.5-5 parts of silane coupling agent; the solid content of the silica sol is 20-25%.
By adopting the technical scheme, as the TiO with stable particle size distribution range is prepared by hydrolyzing under acidic condition through the composite modification of the silicon dioxide sol and the titanium dioxide sol solution2Sol, SiO addition2Sol and TiO2The sol is modified, a hydrophilic and hydrophobic alternate structure is constructed on the surface of the coating, and meanwhile, the hydrophilic structure of the silica sol can effectively form good bonding strength with the fluorocarbon coating, so that the bonding strength of the self-cleaning coating on the surface of the fluorocarbon coating is improvedTherefore, the self-cleaning time efficiency of the surface of the fluorocarbon aluminum veneer is improved, and the self-cleaning performance of the fluorocarbon aluminum veneer is improved.
Further, the silica sol is porous silica sol with the solid content of 20-25%.
Through adopting above-mentioned technical scheme, because this application has optimized porous silica's sol solid content, improve porous silica's content, when improving the hydrophilic performance of automatically cleaning coating, prevent that porous silica granule from because the content is higher leads to agglomerating to reduce its structural strength's problem, this application is through adopting porous structure's silica simultaneously, improves the specific surface area of silica granule, effectively improves between its and the fluorocarbon coating bonding strength to effectively improved the automatically cleaning durability of fluorocarbon aluminium veneer automatically cleaning coating.
Further, the titanium dioxide sol solution is prepared by the following method: (1) respectively weighing 45-50 parts by weight of absolute ethyl alcohol, 3-5 parts by weight of acid catalyst and 25-30 parts by weight of tetrabutyl titanate, placing the absolute ethyl alcohol and the tetrabutyl titanate in a stirring device, stirring and mixing the absolute ethyl alcohol and the tetrabutyl titanate, collecting reaction liquid, and dropwise adding the acid catalyst into the reaction liquid; (2) after the dropwise addition is finished, collecting the dispersed mixed solution, stirring and mixing the dispersed mixed solution and an ethanol solution with the mass fraction of 50% according to the volume ratio of 1:1, and performing ultrasonic dispersion to obtain a titanium dioxide sol solution.
By adopting the technical scheme, the hydrolysis reaction of tetrabutyl titanate is catalyzed by acid, a large amount of monomer titanate and small polymer with reactive Ti-OH groups are formed, amorphous titanium dioxide is generated after the hydrolysis of tetrabutyl titanate, the amorphous titanium dioxide is dissolved into superfine titanium dioxide nano-crystallites after the acid is added, and the crystallites dispersed in the solution are re-grown into anatase nanocrystals, so that the dispersibility of the product in water is improved, and the prepared titanium dioxide gel liquid has good dispersibility.
Further, the acid catalyst is 0.5mol/L hydrochloric acid and 0.1mol/L nitric acid mixed in a mass ratio of 1: 1.
By adopting the technical scheme, since hydrochloric acid and nitric acid are compounded to prepare the acid catalyst, hydrochloric acid in the composite acid catalyst catalyzes titanium dioxide particles to be anatase titanium dioxide, titanium sol is stable, the film forming performance is good, but the dust resisting performance is not good, and when nitric acid is used as the catalyst, the catalytic film forming performance is poor, but the dust resisting performance is excellent, and the two are complementary, so that the prepared composite titanium dioxide sol has good dust resisting rate and film forming performance, and the self-cleaning performance of the fluorocarbon aluminum veneer is improved.
Further, the solid content of the potassium silicate solution is 20-25%.
By adopting the technical scheme, the solid content of potassium silicate is optimized, the modulus of potassium silicate is improved, silicate ions are simple in structure and small in polymerization degree, the silicate ions are added to the coating and then dried, a loose and porous coating can be formed, the micro-nano structure can be formed on the surface of the coating, the roughness is increased, the bonding strength between the coating and the fluorocarbon coating is improved, the solid content is improved, the modulus is increased, the degree of polymerization of the silicate ions is increased, the micro-region and the hole shrinkage of the surface of the coating are reduced, the problem of hydrophilicity of the coating is reduced, and the service life and the self-cleaning performance of the self-cleaning coating of the fluorocarbon aluminum veneer are finally improved.
In a second aspect, the present application provides a method for preparing a self-cleaning weather-resistant fluorocarbon aluminum veneer, where the method for preparing the self-cleaning weather-resistant fluorocarbon aluminum veneer comprises the following steps: s1, coating fluorocarbon coatings on the surfaces of the aluminum veneers according to the formula and curing to obtain the aluminum veneers coated with the fluorocarbon coatings, placing the aluminum veneers coated with the fluorocarbon coatings at room temperature, performing sand blasting treatment and collecting to obtain surface-treated fluorocarbon aluminum veneers; s2, weighing the titanium dioxide sol solution, the potassium silicate solution, the silicon dioxide sol and the wetting agent according to the formula, mixing the wetting agent, the potassium silicate solution and the porous silicon dioxide sol, stirring and mixing at 45-50 ℃, and collecting to obtain a matrix mixed solution; s3, mixing the matrix mixed solution with the titanium dioxide sol solution to obtain a mixed solution, dropwise adding a silane coupling agent into the mixed solution, stirring, mixing and ultrasonically dispersing to obtain a coating solution; s4, coating the surface of the fluorocarbon aluminum single plate at the lifting speed of 3mm/S by using a dipping-lifting method, naturally drying, repeating dipping-lifting treatment for 3-5 times, and naturally drying to obtain the self-cleaning weather-resistant fluorocarbon aluminum single plate.
Through adopting above-mentioned technical scheme, because this application carries out good sand blasting to the fluorocarbon coating earlier, through the sand blasting of less granule, the surface that makes its surface form more is favorable to the anisotropic structure of coating bonding, thereby make the automatically cleaning coating form good joint strength on its surface, the life-span and the automatically cleaning performance of fluorocarbon aluminium veneer automatically cleaning coating have further been improved, this application adopts silane coupling agent to modify compound gel liquid simultaneously, improve the joint strength between the two gels, thereby the automatically cleaning performance of fluorocarbon aluminium veneer has further been improved.
Further, the roughness of the surface-treated fluorocarbon aluminum single plate in the step S1 is 2-3 μm.
Through adopting above-mentioned technical scheme, this application prevents that it from reducing the structural performance on fluorocarbon coating surface owing to too coarse through optimizing the roughness of fluorocarbon aluminium veneer, also prevents that fluorocarbon coating roughness is lower to reduce the bonding strength between fluorocarbon coating and the automatically cleaning coating.
In summary, the present application includes at least one of the following beneficial technical effects:
first, this application has optimized the coating structure between fluorocarbon coating and the automatically cleaning coating to add white carbon black as modified material in the fluorocarbon coating is inside, because white carbon black has good nanometer size and is less than, add it to the coating and handle, make fluorocarbon coating surface form the size effect of micro-nano structure, thereby make the automatically cleaning coating when the coating, have good bonding strength, thereby overcome the low not good problem that leads to the automatically cleaning performance of the bonding strength of automatically cleaning type fluorocarbon aluminum veneer surface automatically cleaning coating of resistant waiting.
Secondly, the composite modification of the silica sol and the titania sol solution is carried out, the TiO2 sol with stable particle size distribution range is prepared by hydrolysis under an acidic condition, the SiO2 sol and the TiO2 sol are added for modification, a hydrophilic and hydrophobic alternate structure is constructed on the surface of the coating, and meanwhile, the hydrophilic structure of the silica sol can effectively form good bonding strength with the fluorocarbon coating, so that the bonding strength of the self-cleaning coating on the surface of the fluorocarbon coating is improved, the self-cleaning aging of the surface of the fluorocarbon aluminum veneer is improved, and the self-cleaning performance of the fluorocarbon aluminum veneer is improved.
Thirdly, the sol solid content of the porous silicon dioxide is optimized, the content of the porous silicon dioxide is improved, the problem that the structural strength of the porous silicon dioxide particles is reduced due to agglomeration caused by high content of the porous silicon dioxide particles is solved while the hydrophilic performance of the self-cleaning coating is improved.
Fourthly, hydrochloric acid and nitric acid are compounded to prepare the acid catalyst, hydrochloric acid in the composite acid catalyst catalyzes titanium dioxide particles to be anatase titanium dioxide, titanium sol is stable, the film forming performance is good, but the dust resisting performance is poor, nitric acid is used as the catalyst, the catalytic film forming performance is poor, but the dust resisting performance is excellent, the hydrochloric acid and the nitric acid are complementary, so that the prepared composite titanium dioxide sol has good dust resisting rate and film forming performance, and the self-cleaning performance of the fluorocarbon aluminum veneer is improved.
Detailed Description
The present application will be described in further detail with reference to examples.
In the examples of the present application, the raw materials and the equipment used are as follows, but not limited thereto:
raw materials: dow Corning company brand is DC7244 wetting agent, R960 titanium pigment;
a machine: sand mills, blenders, and the like.
Examples
Preparation example 1
Respectively weighing 450mL of absolute ethyl alcohol, 30mL of acid catalyst and 250mL of tetrabutyl titanate, placing the absolute ethyl alcohol and the tetrabutyl titanate into a stirring device, stirring and mixing the absolute ethyl alcohol and the tetrabutyl titanate, keeping the temperature at 45 ℃, stirring and mixing for 3 hours, collecting reaction liquid, dropwise adding the acid catalyst into the reaction liquid, controlling the dropwise adding time to be 3 hours, after the dropwise adding is completed, collecting dispersed mixed liquid, stirring and mixing the dispersed mixed liquid with an ethanol solution with the mass fraction of 50% according to the volume ratio of 1:1, and placing the mixture under 200W for ultrasonic dispersion for 10 minutes to obtain a titanium dioxide sol liquid;
preparation example 2
Respectively weighing 475mL of absolute ethyl alcohol, 40mL of acid catalyst and 275mL of tetrabutyl titanate, placing the weighed absolute ethyl alcohol and the weighed tetrabutyl titanate into a stirring device, stirring and mixing the absolute ethyl alcohol and the weighed tetrabutyl titanate, keeping the temperature at 47 ℃, stirring and mixing for 4 hours, collecting reaction liquid, dropwise adding the acid catalyst into the reaction liquid, controlling the dropwise adding time to be 4 hours, after the dropwise adding is completed, collecting dispersed mixed liquid, stirring and mixing the dispersed mixed liquid with an ethanol solution with the mass fraction of 50% according to the volume ratio of 1:1, and placing the mixture under 250W for ultrasonic dispersion for 12 minutes to obtain a titanium dioxide sol liquid;
preparation example 3
Respectively weighing 500mL of absolute ethyl alcohol, 50mL of acid catalyst and 300mL of tetrabutyl titanate, placing the absolute ethyl alcohol and the tetrabutyl titanate into a stirring device, stirring and mixing the absolute ethyl alcohol and the tetrabutyl titanate, keeping the temperature at 50 ℃, stirring and mixing for 5 hours, collecting reaction liquid, dropwise adding the acid catalyst into the reaction liquid, controlling the dropwise adding time to be 5 hours, after the dropwise adding is completed, collecting dispersed mixed liquid, stirring and mixing the dispersed mixed liquid with an ethanol solution with the mass fraction of 50% according to the volume ratio of 1:1, and placing the mixture under 300W for ultrasonic dispersion for 15 minutes to obtain a titanium dioxide sol liquid;
example 1
Taking the fluorocarbon aluminum veneer coated with the fluorocarbon coating, carrying out sand blasting treatment on the surface of the fluorocarbon aluminum veneer, carrying out sand blasting treatment on the aluminum veneer by adopting 800-mesh brown corundum sand at room temperature until the roughness of the aluminum veneer is 2 mu m, and obtaining the surface-treated fluorocarbon aluminum veneer after the sand blasting treatment is finished;
mixing a wetting agent, a potassium silicate solution with a solid content of 20% and a porous silica sol with a solid content of 20% according to a mass ratio of 1:5:10, stirring and mixing at 45 ℃, collecting a matrix mixed solution, mixing the matrix mixed solution and the titanium dioxide sol solution prepared in the preparation example 1 according to a volume ratio of 3:1 to obtain a mixed solution, dropwise adding a silane coupling agent with a mass of 10% of the titanium dioxide sol solution into the mixed solution, stirring and mixing, and placing under 200W for ultrasonic dispersion for 10min to obtain a coating solution;
and (3) coating the surface of the fluorocarbon aluminum single plate at the lifting speed of 3mm/s by using a dipping-lifting method, naturally drying, repeating dipping-lifting treatment for 3 times, and naturally drying to obtain the self-cleaning weather-resistant fluorocarbon aluminum single plate.
Example 2
Taking the fluorocarbon aluminum veneer coated with the fluorocarbon coating, carrying out sand blasting treatment on the surface of the fluorocarbon aluminum veneer, carrying out sand blasting treatment on the aluminum veneer by adopting 900-mesh brown corundum sand at room temperature until the roughness of the aluminum veneer is 2.5 mu m, and obtaining the surface-treated fluorocarbon aluminum veneer after the sand blasting treatment is finished;
mixing a wetting agent, a potassium silicate solution with a solid content of 20% and a porous silica sol with a solid content of 22% according to a mass ratio of 1:5:10, stirring and mixing at 47 ℃, collecting a matrix mixed solution, mixing the matrix mixed solution and the titanium dioxide sol solution prepared in the preparation example 2 according to a volume ratio of 3:1 to obtain a mixed solution, dropwise adding a silane coupling agent with a mass of 10% of the titanium dioxide sol solution into the mixed solution, stirring and mixing, and placing under 250W for ultrasonic dispersion for 12min to obtain a coating solution;
and (3) coating the surface of the fluorocarbon aluminum single plate at the lifting speed of 3mm/s by using a dipping-lifting method, naturally drying, repeating dipping-lifting treatment for 4 times, and naturally drying to obtain the self-cleaning weather-resistant fluorocarbon aluminum single plate.
Example 3
Taking the fluorocarbon aluminum veneer coated with the fluorocarbon coating, carrying out sand blasting treatment on the surface of the fluorocarbon aluminum veneer, carrying out sand blasting treatment on the aluminum veneer by using 1000-mesh brown corundum sand at room temperature until the roughness of the aluminum veneer is 3 mu m, and obtaining the surface-treated fluorocarbon aluminum veneer after the sand blasting treatment is finished;
mixing a wetting agent, a potassium silicate solution with a solid content of 20% and a porous silica sol with a solid content of 25% according to a mass ratio of 1:5:10, stirring and mixing at 50 ℃, collecting a matrix mixed solution, mixing the matrix mixed solution and a titanium dioxide sol solution according to a volume ratio of 3:1 to obtain a mixed solution, dropwise adding a silane coupling agent with a mass of 10% of the titanium dioxide sol solution into the mixed solution, stirring and mixing, and carrying out ultrasonic dispersion at 300W for 15min to obtain a coating solution;
and (3) coating the surface of the fluorocarbon aluminum single plate at the lifting speed of 3mm/s by using a dipping-lifting method, naturally drying, repeating dipping-lifting treatment for 5 times, and naturally drying to obtain the self-cleaning weather-resistant fluorocarbon aluminum single plate.
Examples 4 to 6
In the examples 4 to 6, in the preparation process of the self-cleaning weather-resistant fluorocarbon aluminum single plate, the common silica sol with a solid content of 20 to 25% is used to replace the porous silica sol used in the present application, and the other conditions and component proportions are the same as those in the examples 4 to 6 respectively corresponding to the examples 1 to 3.
Examples 7 to 9
In the preparation process of the self-cleaning weather-resistant fluorocarbon aluminum single plate in the embodiments 7 to 9, the solid content of the potassium silicate solution is adjusted to 10 to 15%, which is the same as the other conditions and component ratios of the embodiments 7 to 9 respectively corresponding to the embodiments 1 to 3.
Examples 10 to 12
In the preparation process of the self-cleaning weather-resistant fluorocarbon aluminum single plate in the embodiments 10 to 12, the solid content of the potassium silicate solution is adjusted to be 26 to 30%, which is the same as the other conditions and component proportions of the corresponding embodiments 10 to 12 in the embodiments 1 to 3.
Performance test
The self-cleaning performance and the weather resistance of the self-cleaning weather-resistant type fluorocarbon aluminum veneer prepared in the embodiment 1-12 are respectively tested.
Detection method/test method
(1) Weather resistance: resistance to artificial weather aging: adopting GB/T1766-1995 to carry out 4000h artificial climate aging resistance test; salt spray resistance: salt spray resistance was tested using astm d 1654-1992.
(2) Appearance of the coating film: and (4) observation.
(3) Adhesion force: the test was carried out using GB/T9286-1998. The results are shown in Table 1 below.
The specific detection results are shown in the following table 1:
TABLE 1 EXAMPLES 1 TO 12 TEST TABLE FOR PERFORMANCE
Referring to the comparison of the performance tests of table 1, it can be found that:
the performances of the embodiments 1 to 3 are compared, and the adhesion and the weather resistance of the embodiments 1 to 3 are improved along with the increase of the adding proportion of the self-cleaning coating, which shows that the present application adopts the composite modification of the silica sol and the titanium dioxide sol solution to construct a hydrophilic and hydrophobic alternate structure on the coating surface, and simultaneously, the hydrophilic structure of the silica sol can effectively form good bonding strength with the fluorocarbon coating, so that the bonding strength of the self-cleaning coating on the fluorocarbon coating surface is improved, the self-cleaning aging of the fluorocarbon aluminum veneer surface is improved, and the self-cleaning performance of the fluorocarbon aluminum veneer is improved.
Comparing the performances of the embodiments 1-3 with those of the embodiments 4-6, in the embodiments 4-6, the common silica sol with 20-25% solid content is used to replace the porous silica sol used in the present application in the preparation process of the self-cleaning weather-resistant type fluorocarbon aluminum veneer, and as can be seen from table 1, the weather resistance and the adhesion of the embodiments 4-6 are reduced, which indicates that the sol of porous silica is used in the present application, so that the specific surface area of the silica particles is improved, the bonding strength between the silica particles and the fluorocarbon coating is effectively improved, and the self-cleaning durability of the self-cleaning coating of the fluorocarbon aluminum veneer is effectively improved.
Comparing the performances of the examples 1-3 with the examples 7-12, the solid content of the potassium silicate solution is changed in the preparation process of the self-cleaning weather-resistant type fluorocarbon aluminum veneer in the examples 7-12, and as can be seen from table 1, the weather resistance and the adhesive force of the examples 7-12 are reduced, which indicates that the solid content of the potassium silicate is optimized, the modulus of the potassium silicate is optimized, and the service life and the self-cleaning performance of the self-cleaning coating of the fluorocarbon aluminum veneer are improved.
Comparative example
Comparative examples 1 to 3
In the comparative examples 1 to 3, titanium dioxide sol with equal mass is directly adopted to prepare the self-cleaning coating, and the conditions and the component proportion are the same as those in the comparative examples 1 to 3 respectively corresponding to the examples 1 to 3.
Comparative examples 4 to 6
In comparative examples 4 to 6, only 0.5mol/L hydrochloric acid was used instead of the acid catalyst used in the present application, and the conditions and component ratios were the same as in comparative examples 4 to 6 corresponding to examples 1 to 3, respectively.
Comparative examples 7 to 9
In comparative examples 7 to 9, only 0.1mol/L nitric acid was used in place of the acid catalyst used in the present application, and the conditions and component ratios were the same as in comparative examples 7 to 9 corresponding to examples 1 to 3, respectively.
Performance test
And respectively testing the self-cleaning performance and the weather resistance of the self-cleaning weather-resistant type fluorocarbon aluminum veneer prepared in the comparison proportion of 1-9.
Detection method/test method
(1) Weather resistance: resistance to artificial weather aging: adopting GB/T1766-1995 to carry out 4000h artificial climate aging resistance test; salt spray resistance: salt spray resistance was tested using astm d 1654-1992.
(2) Appearance of the coating film: and (4) observation.
(3) Adhesion force: the test was carried out using GB/T9286-1998. The results are shown in Table 1 below.
The specific detection results are shown in the following table 1:
TABLE 1 EXAMPLES 1 TO 12 TEST TABLE FOR PERFORMANCE
Referring to the comparison of the performance tests of table 1, it can be found that:
the performances of the comparative examples 1 to 3 are compared with those of the examples 1 to 3, and it can be found in table 1 that the adhesive force in the comparative examples 1 to 3 is obviously reduced, which shows that the hydrophilic and hydrophobic alternate structures are constructed on the surface of the coating by the composite modification of the silica sol and the titanium dioxide sol solution, and meanwhile, the hydrophilic structure of the silica sol can effectively form good bonding strength with the fluorocarbon coating, so that the bonding strength of the self-cleaning coating on the surface of the fluorocarbon coating is improved, the self-cleaning aging of the surface of the fluorocarbon aluminum veneer is improved, and the self-cleaning performance of the fluorocarbon aluminum veneer is improved.
Comparing the performances of the examples 1-3 with the comparative examples 4-9, as the comparative examples 4-9 only adopt 0.5mol/L hydrochloric acid to replace the acid catalyst adopted in the application, as can be seen from table 1, the weather resistance and the adhesive force of the comparative examples 4-9 are both reduced, which indicates that the acid catalyst is prepared by compounding hydrochloric acid and nitric acid, as the hydrochloric acid in the composite acid catalyst catalyzes titanium dioxide particles to be anatase titanium dioxide, and titanium sol is stable, the film forming performance is good, but the dust resisting performance is not good, and when nitric acid is used as a catalyst, the catalytic film forming performance is poor, but the dust resisting performance is good, and the two are complementary, the prepared composite titanium dioxide sol has good dust resisting rate and film forming performance, thereby improving the self-cleaning performance of the fluorocarbon aluminum veneer.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.
Claims (8)
1. The self-cleaning weather-resistant fluorocarbon aluminum veneer is characterized by comprising a fluorocarbon coating and a self-cleaning coating which are sequentially coated from inside to outside, wherein the fluorocarbon coating is prepared by curing a fluorocarbon coating after being coated, and the fluorocarbon coating comprises the following substances in parts by weight:
45-50 parts of fluorocarbon resin;
0.1-0.3 part of a dispersing agent;
3-5 parts of amino resin;
1-2 parts of isocyanate;
0.2-0.5 part of a leveling agent;
15-30 parts of white carbon black;
60-100 parts of methyl isobutyl ketone.
2. The self-cleaning weather-resistant fluorocarbon aluminum veneer as claimed in claim 1, wherein the self-cleaning coating comprises the following substances in parts by weight:
45-50 parts of titanium dioxide sol solution;
15-20 parts of potassium silicate solution;
25-30 parts of silica sol;
3-5 parts of a wetting agent;
4.5-5 parts of a silane coupling agent;
the solid content of the silica sol is 20-25%.
3. The self-cleaning weather-resistant fluorocarbon aluminum veneer as claimed in claim 2, wherein the silica sol is a porous silica sol with a solid content of 20-25%.
4. The self-cleaning weather-resistant fluorocarbon aluminum veneer as claimed in claim 2, wherein the titanium dioxide sol solution is prepared by the following method:
(1) respectively weighing 45-50 parts by weight of absolute ethyl alcohol, 3-5 parts by weight of acid catalyst and 25-30 parts by weight of tetrabutyl titanate, placing the absolute ethyl alcohol and the tetrabutyl titanate in a stirring device, stirring and mixing the absolute ethyl alcohol and the tetrabutyl titanate, collecting reaction liquid, and dropwise adding the acid catalyst into the reaction liquid;
(2) after the dropwise addition is finished, collecting the dispersed mixed solution, stirring and mixing the dispersed mixed solution and an ethanol solution with the mass fraction of 50% according to the volume ratio of 1:1, and performing ultrasonic dispersion to obtain a titanium dioxide sol solution.
5. The self-cleaning weather-resistant fluorocarbon aluminum veneer as claimed in claim 4, characterized in that the acid catalyst is 0.5mol/L hydrochloric acid and 0.1mol/L nitric acid mixed according to the mass ratio of 1: 1.
6. The self-cleaning weather-resistant fluorocarbon aluminum veneer as claimed in claim 4, wherein the solid content of the potassium silicate solution is 20-25%.
7. The method for preparing a self-cleaning weather-resistant fluorocarbon aluminum veneer as claimed in any one of claims 1 to 6, wherein the method for preparing the self-cleaning weather-resistant fluorocarbon aluminum veneer comprises the following steps:
s1, coating fluorocarbon coatings on the surfaces of the aluminum veneers according to the formula and curing to obtain the aluminum veneers coated with the fluorocarbon coatings, placing the aluminum veneers coated with the fluorocarbon coatings at room temperature, performing sand blasting treatment and collecting to obtain surface-treated fluorocarbon aluminum veneers;
s2, weighing the titanium dioxide sol solution, the potassium silicate solution, the silicon dioxide sol and the wetting agent according to the formula, mixing the wetting agent, the potassium silicate solution and the porous silicon dioxide sol, stirring and mixing at 45-50 ℃, and collecting to obtain a matrix mixed solution;
s3, mixing the matrix mixed solution with the titanium dioxide sol solution to obtain a mixed solution, dropwise adding a silane coupling agent into the mixed solution, stirring, mixing and ultrasonically dispersing to obtain a coating solution;
s4, coating the surface of the fluorocarbon aluminum single plate at the lifting speed of 3mm/S by using a dipping-lifting method, naturally drying, repeating dipping-lifting treatment for 3-5 times, and naturally drying to obtain the self-cleaning weather-resistant fluorocarbon aluminum single plate.
8. The method for preparing a self-cleaning weather-resistant fluorocarbon aluminum veneer as claimed in claim 7, wherein the roughness of the surface-treated fluorocarbon aluminum veneer in step S1 is 2-3 μm.
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