CN116814110B - A method for preparing super-amphiphobic porous powder and super-amphiphobic coating containing the powder - Google Patents
A method for preparing super-amphiphobic porous powder and super-amphiphobic coating containing the powder Download PDFInfo
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- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
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Abstract
本发明公开了一种超双疏多孔粉体的制备方法及含上述粉体的超双疏涂料，超双疏多孔粉体的制备方法具体为：以质量份数计，在50～80℃恒温水浴下将0.3～0.5份表面活性剂、5～8份纳米溶胶、4～5份氨水、0.4～0.5份低表面能物质加入水中，搅拌得到改性的纳米颗粒悬浮液；在纳米颗粒悬浮液中依次加入0.5～0.6份低表面能物质、0.7～1.2份氢氧化铝和3～5份微米多孔颗粒，搅拌后得到负载纳米颗粒的微米多孔颗粒悬浮液；将微米多孔颗粒悬浮液在高温下干燥后得到负载纳米颗粒的超双疏多孔粉体。
The invention discloses a method for preparing a super-amphiphobic porous powder and a super-amphiphobic coating containing the powder. The method for preparing the super-amphiphobic porous powder is specifically as follows: by weight, in a constant temperature water bath of 50-80 DEG C, 0.3-0.5 parts of a surfactant, 5-8 parts of a nano sol, 4-5 parts of ammonia water, and 0.4-0.5 parts of a low surface energy substance are added into water, and stirred to obtain a modified nano particle suspension; 0.5-0.6 parts of a low surface energy substance, 0.7-1.2 parts of aluminum hydroxide, and 3-5 parts of micron porous particles are sequentially added into the nano particle suspension, and after stirring, a micron porous particle suspension loaded with nano particles is obtained; and the micron porous particle suspension is dried at high temperature to obtain a super-amphiphobic porous powder loaded with nano particles.
Description
Technical Field
The invention relates to a preparation method of super-amphiphobic porous powder and also relates to a coating containing the super-amphiphobic porous powder.
Background
The superhydrophobic surface has important application prospect in the fields of self-cleaning, corrosion prevention, ice prevention, fog prevention, corrosion prevention, oil-water separation and the like due to the special surface wettability. In a real environment, the solid surface is contacted with water and oil stains such as soybean oil, normal hexane and carbon tetrachloride, and the oily liquids are easily spread on the hydrophobic surface to limit the use of the super-hydrophobic coating in the oil stain environment, so that in order to meet the actual application requirements, development of the super-amphiphobic coating is needed to solve the self-cleaning problem in the oil-water coexistence environment. The super-amphiphobic surface is characterized in that under the synergistic effect of a surface micro-nano structure and low surface energy substances, the contact angle of the surface to water and oil drops is larger than 150 degrees, and the super-amphiphobic surface has excellent comprehensive properties of three-proofing (water proofing, oil proofing, dust proofing), dew resistance, drag reduction, corrosion resistance and the like, and can be widely applied to the industrial fields of three-proofing of fabrics, dew resistance and frost resistance of air conditioners, antibiosis and mildew resistance of building materials, oil-water separation, adhesion resistance interfaces, water collecting systems and the like.
However, when the fragile micro-nano structure on the surface of the super-hydrophobic coating is damaged physically or chemically, the surface hydrophobicity of the micro-nano structure is reduced or lost, and the problem of poor wear resistance limits the use of the micro-nano structure under actual working conditions. In the preparation process of the super-hydrophobic coating, organic solvents such as ethanol, acetone and the like are doped, so that the super-hydrophobic coating brings great harm to human bodies and the environment.
Disclosure of Invention
The invention aims to provide a preparation method of the super-amphiphobic porous powder, and also provides a coating containing the super-amphiphobic porous powder, wherein the super-amphiphobic porous powder prepared by the method can be applied to various resin systems to form the coating, so that the wear resistance of a finally obtained super-amphiphobic coating is remarkably improved, and when the coating is worn, nano particles in the super-amphiphobic porous powder are instantly released to enable the super-hydrophobicity of the coating to be continuously maintained, so that the long-acting property of the super-hydrophobic super-oleophobic coating is effectively improved.
The preparation method of the super-amphiphobic porous powder comprises the following steps:
(1) Adding 0.3-0.5 part of surfactant, 5-8 parts of nano sol, 4-5 parts of ammonia water and 0.4-0.5 part of low-surface-energy substance into water in parts by mass under the constant-temperature water bath of 50-80 ℃ and stirring to obtain modified nanoparticle suspension;
(2) Sequentially adding 0.5-0.6 part of low-surface-energy substance, 0.7-1.2 parts of aluminum hydroxide and 3-5 parts of micron porous particles into the nanoparticle suspension, and stirring to obtain nanoparticle-loaded micron porous particle suspension;
(3) And drying the suspension of the micron porous particles at high temperature to obtain the super-amphiphobic porous powder loaded with the nano particles.
Wherein in the step (1), the surfactant is at least one of FS-3100, FS-61 or FS-30.
In the step (1), the nano sol is one of zinc oxide, silicon dioxide and titanium dioxide with the particle size of 5-40 nm, the solid content of the nano sol is 10-35 wt%, and the pH value is 9-12. Ammonia is used to keep the reaction system alkaline while promoting cleavage of Si-O-Si bonds in low surface energy species, thereby grafting onto the microporous particles.
Wherein in the step (1) and the step (2), the low-surface-energy substance is at least one of tridecafluorooctyl triethoxysilane, heptadecafluorodecyl trimethoxysilane, tridecafluorooctyl trimethoxysilane or heptadecafluorodecyl triethoxy.
In the step (2), the micro porous particles are at least one of ceramics, diatomite or glass porous microspheres with the particle size of 10-50 μm, and the shape of the micro porous particles is sheet-shaped, columnar, disc-shaped or spherical. Aluminum hydroxide
In the step (2), the solid content of the nano-particle loaded microporous particle suspension is 1wt.% to 30wt.%, and the pH value is 9 to 12.
In the step (3), the drying temperature is 120-180 ℃ and the drying time is 4-6 hours, and the surfactant in the solution is volatilized at high temperature, so that the surfactant is effectively prevented from affecting the super-amphiphobic state of the super-amphiphobic porous powder.
In the step (3), the particle size of the super-amphiphobic porous powder loaded with nano particles is 10-80 μm.
The water-based paint containing the super-amphiphobic porous powder comprises, by mass, 1.5-2 parts of the super-amphiphobic porous powder, 0.15 part of a surfactant, 3-5 parts of a film forming material and 9-10 parts of deionized water.
The oily paint containing the super-amphiphobic porous powder comprises, by mass, 0.1-0.5 part of the super-amphiphobic porous powder, 0.5-0.6 part of oleoresin, 0.15-0.2 part of a curing agent and 1-2 parts of an organic solvent.
The volatile organic solvent is at least one of butyl acetate, ethanol, n-hexane, diethyl ether, benzene or ketone, the film forming material is at least one of aqueous fluorocarbon resin, aqueous acrylic resin or aqueous polyurethane resin, organic silicon resin or epoxy resin with low surface energy, and the curing agent is at least one of imidazole, polyamide, aromatic amine, polyether amine, alicyclic amine or isocyanate.
And (3) coating the super-amphiphobic or oily coating on the surface of any cleaned substrate by a spray coating, dip coating, brush coating or roll coating method, and heating and drying in an oven at 80-200 ℃ for 1-2 hours to obtain the super-amphiphobic coating. The super-amphiphobic coating has a contact angle of more than 165 DEG and a rolling angle of less than 2 DEG at 5 mu L of soybean oil.
The powder coating containing the super-amphiphobic porous powder comprises, by mass, 0.2-1 part of the super-amphiphobic porous powder and 6-30 parts of binder powder.
Wherein the adhesive powder is at least one of polyester resin powder, polymethyl methacrylate powder or polytetrafluoroethylene resin powder.
And placing 0.2-1 part of super-amphiphobic porous powder and 6-30 parts of binder powder into a multifunctional crusher to mix and stir the powder for 1-2 minutes to obtain uniformly mixed powder, carrying out electrostatic spraying on the uniformly mixed powder on a metal substrate, placing the metal substrate in an oven to bake for 30min at 100-150 ℃, curing for 10-20 min at 225 ℃, and cooling to room temperature to obtain the super-amphiphobic coating.
Compared with the prior art, the super-amphiphobic porous powder has the advantages that (1) when the micro-porous particles are subjected to hydrophobic modification, aluminum hydroxide can improve the chemical bond activity of the micro-porous particles (the activity of aluminum hydroxyl is greater than that of silicon hydroxyl), so that the grafting rate of the micro-porous particles to hydrophobic groups is effectively improved, the bonding strength of the micro-porous particles to the nano-particles and subsequent organic resin can be improved, the amphiphobic property (hydrophobicity and oleophobicity) of the super-amphiphobic porous powder is effectively improved, the strength and the wear resistance of a coating can be effectively improved, and (2) in the super-amphiphobic porous powder, the nano-particles are loaded in the holes of the micro-porous particles, the nano-particles are completely hydrophobically modified, the micro-porous particles are incompletely hydrophobically modified, the unmodified completely micro-porous particles are rich in hydroxyl groups, and the nano-particles and the organic resin are bridged through chemical bonding, so that the wear resistance and the bonding strength with a substrate of the coating are improved, and the super-amphiphobic porous coating obtained based on the super-amphiphobic porous powder can effectively improve the oil stain resistance and the corrosion resistance, the anti-ice and anti-frost resistance of the surface and the anti-condensation property.
Drawings
FIG. 1 is a transmission electron micrograph of microporous particles, (a) TEM photograph of microporous particles loaded with Al (OH) 3, (b) TEM photograph of microporous particles not loaded with Al (OH) 3;
FIG. 2 shows DSC-TG curves of DE@Si 2 and DE@Al (OH) 3, (a) DSC-TG curve of DE@SiO 2/Al(OH)3, (b) DSC-TG curve of DE@SiO 2;
FIG. 3 is a graph showing the hardness and elastic modulus of the modified micro porous powder, the nano silica-loaded porous powder and the super-amphiphobic porous powder obtained in comparative example 3, comparative example 4 and example 3, wherein the abscissa represents the three powders of the modified micro porous powder, the nano silica-loaded porous powder and the super-amphiphobic porous powder, the red line represents the elastic modulus, the right ordinate is marked, the black line represents the hardness, and the left ordinate is marked;
FIG. 4 shows tensile strength and elongation of various system coatings;
FIG. 5 is a physical view of a nanoparticle-laden porous particle suspension;
FIG. 6 shows the wettability of several powders, (a) from left to right, the surface of the super-amphiphobic porous powder prepared in example 3 is dyed with soybean oil, and (b) the water wettability of the super-amphiphobic porous powder prepared in example 3;
FIG. 7 is a state diagram of hydrophobicity and Cassie of a surface of a coating comprising super-amphiphobic porous powders;
FIG. 8 is an optical photograph and schematic diagram of a coating surface cross-cut with super-amphiphobic porous powder;
FIG. 9 shows the mechanical properties of a coating containing super-amphiphobic porous powder, wherein (a) shows the change of the water wettability of the super-amphiphobic coating along with the abrasion period, (b) shows the abrasion experiment schematic diagram of the super-amphiphobic coating Taber, and (c) and (d) show SEM images before and after abrasion of the super-amphiphobic coating respectively;
FIG. 10 shows schematic diagrams before and after drawing test of the super-amphiphobic coating, wherein (a) is schematic diagram before drawing test, and (b) is schematic diagram after drawing test;
FIG. 11 shows an antifouling test of the super-amphiphobic coating, wherein (a) is a schematic diagram before the antifouling test, (b) is a schematic diagram of the cement paste rolling off the coating, and (c) is a schematic diagram of the cement paste not being stained with the coating after the antifouling test;
FIG. 12 shows a dust-proof test of the super-amphiphobic coating, a schematic view before the dust-proof test, a schematic view of dust taken away under the flushing of water, and a schematic view of the coating not stained with dust after the dust-proof test;
FIG. 13 is a performance characterization of the super-amphiphobic coating, with (a) self-cleaning, (b) anti-fouling, and (c) hydrophobic and anti-concrete properties.
Detailed Description
Example 1
The preparation method of the aluminum hydroxide loaded porous powder comprises the following steps:
(1) Sequentially adding 5 parts of nano particles, 4 parts of ammonia water, 0.4 part of perfluorodecyl triethoxysilane and 0.3 part of surfactant into 80 parts of deionized water under a constant temperature water bath of 50 ℃, and magnetically stirring for 10 hours to obtain modified nano particle suspension, wherein the nano particles are aluminum hydroxide nano particles, and the surfactant is fluorocarbon surfactant FS-30;
(2) Sequentially adding 0.6 part of perfluorodecyl triethoxysilane and 3 parts of micron porous particles into the modified nanoparticle suspension, and magnetically stirring for 10 hours to obtain a nanoparticle-loaded porous particle suspension, wherein the micron porous particles are diatomite;
(3) And drying the porous particle suspension carrying the nano particles for 4 hours at 180 ℃ to obtain the micron porous powder carrying the nano particles. The particle size of the micron porous powder loaded with the nano particles is 20-30 mu m.
Comparative example 1
Adding 3 parts of diatomite, 4 parts of ammonia water, 0.6 part of perfluorodecyl triethoxysilane and 0.3 part of fluorocarbon surfactant FS-30 into 80 parts of deionized water in sequence under a constant temperature water bath at 50 ℃, magnetically stirring for 10 hours to obtain modified microparticle suspension, and drying the modified microparticle suspension for 4 hours at 180 ℃ to obtain the micron porous powder without loaded nanoparticles. The particle size of the micron porous powder without the nano particles is 20-30 mu m.
FIG. 1 is a transmission electron microscope image of microporous particles, and it can be seen from FIG. 1 (a) that the porous particles prepared in example 1 successfully support a layer of aluminum hydroxide film, and the semitransparent Al (OH) 3 nano-film is particularly apparent at the holes.
Example 2
The preparation method of the super-amphiphobic porous powder comprises the following steps:
(1) Sequentially adding 8 parts of silica sol, 4 parts of ammonia water, 0.4 part of perfluorodecyl triethoxysilane and 0.3 part of surfactant into 80 parts of deionized water under a constant temperature water bath at 50 ℃ and magnetically stirring for 10 hours to obtain modified nanoparticle suspension, wherein the nanoparticles are silica nanoparticles, and the surfactant is fluorocarbon surfactant FS-30;
(2) Sequentially adding 0.6 part of perfluorodecyl triethoxysilane, 1.2 parts of aluminum hydroxide and 3 parts of micron porous particles into the modified nanoparticle suspension, and magnetically stirring for 10 hours to obtain a nanoparticle-loaded porous particle suspension, wherein the micron porous particles are diatomite;
(3) And drying the porous particle suspension carrying the nano particles for 4 hours at 180 ℃ to obtain the micron porous powder DE@SiO 2/Al(OH)3.DE@SiO2/Al(OH)3 carrying the nano particles, wherein the particle size of the micron porous powder DE@SiO 2/Al(OH)3.DE@SiO2/Al(OH)3 is 20-30 mu m.
Comparative example 2
A preparation method of super-amphiphobic porous powder comprises the following steps:
(1) Sequentially adding 8 parts of silica sol, 4 parts of ammonia water, 0.4 part of perfluorodecyl triethoxysilane and 0.3 part of surfactant into 80 parts of deionized water under a constant temperature water bath at 50 ℃ and magnetically stirring for 10 hours to obtain modified nanoparticle suspension, wherein the nanoparticles are silica nanoparticles, and the surfactant is fluorocarbon surfactant FS-30;
(2) Sequentially adding 0.6 part of perfluorodecyl triethoxysilane and 3 parts of micron porous particles into the modified nanoparticle suspension, and magnetically stirring for 10 hours to obtain a nanoparticle-loaded porous particle suspension, wherein the micron porous particles are diatomite;
(3) And drying the porous particle suspension carrying the nano particles for 4 hours at 180 ℃ to obtain the micron porous powder DE@SiO 2.DE@SiO2 carrying the nano particles, wherein the particle size of the micron porous powder DE@SiO 2.DE@SiO2 is 20-30 mu m.
FIG. 2 shows the results of thermogravimetric analysis of the two particles obtained in example 2 and comparative example 2, and it is clear from the thermogravimetric analysis of FIG. 2 that the mass change between 300 and 600℃in the DE@SiO 2 and DE@SiO 2/Al(OH)3 systems represents a mass change of the grafted fluorosilane, wherein the mass of fluorosilane in the DE@SiO 2/Al(OH)3 system is 23.25% and the mass of fluorosilane in the DE@SiO 2 system is 16.69%, indicating a higher grafting ratio of fluorosilane in the DE@SiO 2/Al(OH)3 system and thus a coating system to which Al (OH) 3 is added is more hydrophobic and oleophobic. The aluminum hydroxide is added to form aluminum hydroxyl groups, so that more grafting sites are provided, more hydroxyl groups on the microporous particles react with the fluorosilane with low surface energy, the grafting rate of hydrophobic groups is improved, the hydrophobicity of the subsequent coating is better, more hydroxyl groups on the microporous particles can chemically react with hydroxyl groups on the resin and the substrate, the interface strength of the coating is enhanced, and the wear resistance of the coating is improved.
Example 3
The preparation method of the super-amphiphobic porous powder comprises the following steps:
(1) Sequentially adding 5 parts of silica sol, 4 parts of ammonia water, 0.4 part of perfluorodecyl triethoxysilane and 0.3 part of surfactant into 80 parts of deionized water under a constant temperature water bath at 50 ℃ and magnetically stirring for 10 hours to obtain modified nanoparticle suspension, wherein the nanoparticles are silica nanoparticles, and the surfactant is fluorocarbon surfactant FS-30;
(2) Sequentially adding 0.6 part of perfluorodecyl triethoxysilane, 0.7 part of aluminum hydroxide and 3 parts of micron porous particles into the modified nanoparticle suspension, and magnetically stirring for 10 hours to obtain a nanoparticle-loaded porous particle suspension, wherein the micron porous particles are diatomite;
(3) And drying the porous particle suspension carrying the nano particles for 4 hours at 180 ℃ to obtain the micron porous powder carrying the nano particles. The particle size of the micron porous powder loaded with the nano particles is 20-30 mu m.
Comparative example 3
0.3 Part of fluorocarbon surfactant FS-30, 4 parts of ammonia water, 0.6 part of perfluorodecyl triethoxysilane and 3 parts of diatomite are sequentially added into 80 parts of deionized water under a constant temperature water bath at 50 ℃ to prepare a micron porous particle suspension, and the micron porous powder is obtained after drying for 4 hours at 180 ℃.
Comparative example 4
(1) Sequentially adding 5 parts of silica sol, 4 parts of ammonia water, 0.4 part of perfluorodecyl triethoxysilane and 0.3 part of surfactant into 80 parts of deionized water under a constant temperature water bath at 50 ℃ and magnetically stirring for 10 hours to obtain modified nanoparticle suspension, wherein the nanoparticles are silica nanoparticles, and the surfactant is fluorocarbon surfactant FS-30;
(2) Sequentially adding 0.6 part of perfluorodecyl triethoxysilane and 3 parts of micron porous particles into the modified nanoparticle suspension, and magnetically stirring for 10 hours to obtain a porous particle suspension carrying nano silicon dioxide, wherein the micron porous particles are diatomite;
(3) And drying the porous particle suspension loaded with the nano silicon dioxide for 4 hours at 180 ℃ to obtain the porous powder loaded with the nano silicon dioxide.
The hardness and the elastic modulus of the modified micro porous powder, the nano silica-loaded porous powder and the super-amphiphobic porous powder obtained in comparative example 3, comparative example 4 and example 3 are tested and compared by using a nano indentation experiment, and as shown in fig. 3, the hardness and the elastic modulus of the super-amphiphobic porous powder are better than those of the modified micro porous powder and the nano silica-loaded porous powder, which benefit from the addition of aluminum hydroxide.
Example 4
The coating was prepared from de@sio 2 and de@sio 2/Al(OH)3 prepared in example 2, specifically:
And (3) stirring 0.15 part of fluorocarbon surfactant FS-30 and 1.5 parts of DE@SiO 2 in parts by mass into 9 parts of water, adding 3 parts of aqueous polyurethane resin, stirring for 5min to obtain the coating of the porous powder, coating the coating of the porous powder on the surface of any cleaned substrate, and placing in a 150 ℃ oven for heating and drying for 1h to obtain the super-amphiphobic coating of the DE@SiO 2 system.
And (3) stirring 0.15 part of fluorocarbon surfactant FS-30 and 1.5 parts of DE@SiO 2/Al(OH)3 in parts by mass into 9 parts of water, adding 3 parts of aqueous polyurethane resin, stirring for 5min to obtain the coating of the porous powder, coating the coating of the porous powder on the surface of any cleaned substrate, and placing in a 150 ℃ oven for heating and drying for 1h to obtain the super-amphiphobic coating of the DE@SiO 2/Al(OH)3 system.
And adding 5 parts of pure polyurethane resin into 10 parts of deionized water to obtain diluted polyurethane solution, coating the diluted polyurethane solution on the surface of any cleaned substrate, and then placing the substrate in a 150 ℃ oven for heating and drying for 1h to obtain the coating of the pure PU system.
As shown in FIG. 4, the elongation of the super-amphiphobic coating of the DE@SiO 2/Al(OH)3 system is slightly lower than that of the super-amphiphobic coating of the DE@SiO 2 system, and the tensile strength is as high as 155.68Mpa and is 1.5 times that of the super-amphiphobic coating of the DE@SiO 2 system. Compared with the DE@SiO 2 system, the addition of Al (OH) 3 in the DE@SiO 2/Al(OH)3 system only sacrifices a small amount of elongation to improve the tensile strength of the coating to 1.5 times that of the super-amphiphobic coating of the DE@SiO 2 system, and the addition of Al (OH) 3 is proved to be beneficial to the strength improvement.
FIG. 5 is a physical diagram of the super-amphiphobic porous powder suspension produced in example 3, and as can be seen from FIG. 5, the super-amphiphobic porous powder suspension exhibits an off-white color. Fig. 6 is a wettability characterization of several powders, in which fig. 6 (a) shows, from left to right, unmodified aluminum hydroxide nanoparticles, unmodified microporous particles, and the super-amphiphobic porous powder prepared in example 3. On the surface of the super-amphiphobic porous powder, dyed soybean oil is spherical, and compared with unmodified aluminum hydroxide nano particles and unmodified micro-porous particles, the modified soybean oil has excellent oleophobic performance. FIG. 6 (b) shows that the super-amphiphobic porous powder prepared in example 3 has excellent hydrophobic properties and a distinct boundary with water in the bottle. The super-amphiphobic porous powder prepared in the example 3 is diluted by ethanol according to the mass ratio of 1:5 and sprayed on metal or glass sheets. The superhydrophobic surface with the contact angle of 165 DEG and the rolling angle of 1 DEG can be obtained.
Example 5
The super-amphiphobic porous powder prepared in the embodiment 3 is used as a raw material to prepare a super-amphiphobic coating, which is specifically:
And (3) according to parts by weight, stirring and dispersing 0.15 part of fluorocarbon surfactant FS-30 and 6 parts of super-amphiphobic porous powder in 20 parts of deionized water, then adding 20 parts of aqueous polyurethane resin, stirring for 5min to obtain the coating of the porous powder, coating the coating of the porous powder on the surface of any cleaned substrate, and placing in a 150 ℃ oven for heating and drying for 1h to obtain the super-amphiphobic coating.
Fig. 7 is a graph of macroscopic wettability of 5 μl of water and oil droplets of the coating, and it can be seen from fig. 7 that the rolling angle of the water and oil droplets is 1±0.3° and 1.5±0.5°, the super-amphiphobic coating has excellent super-hydrophobicity and super-oleophobicity, the surface wetting state thereof has reached the Cassie state, and the coating has excellent uniformity and flatness, and the surface of the coating has no shrinkage cavity, foaming, cracking, flaking, bottoming, and the like.
Example 6
The super-amphiphobic porous powder prepared in the embodiment 3 is used as a raw material to prepare a super-amphiphobic coating, which is specifically:
According to the parts by weight, 0.3 part of super-amphiphobic porous powder is mechanically stirred and dispersed in 1.5 parts of butyl acetate, then 0.5 part of oleoresin is added, stirring is carried out for 5min to obtain the coating of the porous powder, the coating of the porous powder is coated on the surface of any cleaned substrate, and the substrate is placed in an 80 ℃ oven for heating and drying for 1h to obtain the super-amphiphobic coating.
The prepared super-amphiphobic coating is cross-diced by a paint film dicing device, and fig. 8 is an optical photograph and a schematic diagram of the super-amphiphobic coating after dicing, and as can be seen from fig. 8, the coating does not fall off after dicing experiments, and the adhesive force of the coating is 0 level. In addition, the super-amphiphobic coating after the water drops are dripped into the cross-cut coating, the coating still maintains excellent super-hydrophobic performance after being scratched, and the coating shows excellent mechanical stability.
Example 7
The super-amphiphobic porous powder prepared in the embodiment 3 is used as a raw material to prepare a super-amphiphobic coating, which is specifically:
according to the parts by weight, 0.3 part of super-amphiphobic porous powder is mechanically stirred and dispersed in 1.5 parts of butyl acetate, then 0.5 part of oily fluorocarbon resin is added, stirring is carried out for 5min to obtain the coating of the porous powder, the coating of the porous powder is coated on the surface of any cleaned substrate, and the substrate is placed at room temperature for 5-10 min to obtain the super-amphiphobic coating.
The abrasion resistance of the coatings was tested using the Taber test and the results are shown in fig. 9. The water contact angle of the surface of the coating is 152.05 +/-1.08 degrees, the rolling angle of the coating is 2.47+/-0.78 degrees, and the water contact angle of the coating is still larger than 150 degrees when the coating passes 1300r under the load of 1Kg, as shown in fig. 9 (a). The coating before abrasion presents a porous structure of a loose overpass, the skeleton of the microparticles is rich in modified nanoparticles, and the cooperative action of the structure and the low-surface-energy substance enables the coating to have excellent amphiphobicity, as shown in fig. 9 (c). When the coating is worn, the micro-scale skeleton structure is flattened, but the nanoparticles are still visible, which structure allows the coating to remain superhydrophobic after 1300r wear under a load of 1Kg, as shown in fig. 9 (d).
Example 8
The super-amphiphobic porous powder prepared in the embodiment 3 is used as a raw material to prepare a super-amphiphobic coating, which is specifically:
According to the parts by weight, 0.3 part of super-amphiphobic porous powder is mechanically stirred and dispersed in 1.5 parts of butyl acetate, then 0.5 part of oily fluorocarbon resin and 0.15 part of curing agent are added, stirring is carried out for 5min, the coating of the porous powder is obtained, the coating of the porous powder is sprayed on the surface of the cleaned tinplate, and the tinplate is placed at normal temperature for 5-10 min, so that the super-amphiphobic coating is obtained.
The super-amphiphobic coating was tested by a drawing test, and the test results before and after drawing are shown in fig. 10, and the average value of the coating adhesion force of 160 μm in film thickness is 6.05MPa.
Example 9
The super-amphiphobic porous powder prepared in the embodiment 3 is used as a raw material to prepare a super-amphiphobic coating, which is specifically:
And (3) mechanically stirring and dispersing 0.3 part of super-amphiphobic porous powder into 1.5 parts of butyl acetate, then adding 0.5 part of oily fluorocarbon resin and 0.15 part of curing agent, stirring for 5min to obtain the coating of the porous powder, spraying the coating of the porous powder onto the surface of a cleaned glass substrate, and standing at normal temperature for 5-20 min to obtain the super-amphiphobic coating.
The anti-fouling effect of the coating was tested using grout, and the results are shown in FIG. 11, in the anti-fouling test, grout can easily roll off the coating, no mark of grout remains on the white coating, indicating that the super-amphiphobic coating has excellent anti-fouling potential. The dust-proof effect of the coating was tested by using the soil, and the result is shown in fig. 12, in the dust-proof test, dust can easily roll off the coating, and no trace of dust is left on the white coating, which indicates that the super-amphiphobic coating has excellent dust-proof potential.
Example 10
The super-amphiphobic porous powder prepared in the embodiment 3 is used as a raw material to prepare a super-amphiphobic coating, specifically, 1 part of the super-amphiphobic porous powder and 30 parts of polyester resin powder are uniformly mixed by a dry mixing method to obtain mixed powder, the mixed powder is sprayed on a conductive substrate by an electrostatic powder spraying method, the conductive substrate is baked for 30min at 110-150 ℃ and cured for 15min at 180-250 ℃ to obtain the coating with the anti-concrete characteristic.
The self-cleaning performance of the coating was tested using cement ash, as shown in fig. 13 (a), and the cement ash on the coating could be easily removed under a deionized water rinse. The antifouling effect of the coating was tested by using grout, and the result is shown in fig. 13 (b), in the antifouling test, the massive mortar was easily dropped from the coating, and no trace of mortar remained on the uniform and dense coating, indicating that the powder coating had excellent antifouling potential.
In addition, the hydrophobic and anti-concrete capabilities of the powder coating layers with different proportions are quantitatively characterized through experiments, and as shown in fig. 13 (c), the anti-concrete capability of the coating layer obtained by the mass ratio of the super-amphiphobic porous powder to the resin powder is most excellent.
Claims (8)
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