Titanium alloy surface PTFE-SiO2Preparation method of super-hydrophobic coating
阅读说明：本技术 一种钛合金表面PTFE-SiO2超疏水涂层的制备方法 (Titanium alloy surface PTFE-SiO2Preparation method of super-hydrophobic coating ) 是由 邱超 李梦 韩明炜 安斯奇 赖安卿 于 2021-08-20 设计创作，主要内容包括：本发明公开了一种钛合金表面PTFE-SiO-2超疏水涂层的制备方法,包括步骤：S1、取干燥的SiO-2粉末与去离子水混合,利用磁力搅拌器在30℃、300r/min下搅拌15min,再向溶液中加入PTFE溶液,继续使用磁力搅拌器在30℃、300r/min下搅拌15min,得到含氟及纳米颗粒的涂料,其中SiO-2粉末的质量、去离子水的体积、PTFE溶液的体积比为(0.6-0.9)g：10ml：5ml；S2、钛合金使用砂纸打磨光滑,依次用丙酮、无水乙醇以及去离子水对铝合金表面进行超声清洗5min,然后对其表面干燥,将涂料喷涂至钛合金表面,待其表面涂层固化得到超疏水涂层。其具有工艺简单、性能优良的优点。(The invention discloses PTFE-SiO on the surface of titanium alloy 2 The preparation method of the super-hydrophobic coating comprises the following steps: s1, taking dry SiO 2 Mixing the powder with deionized water, stirring with magnetic stirrer at 30 deg.C and 300r/min for 15min, adding PTFE solution, and stirring with magnetic stirrer at 30 deg.C and 300r/min for 15min to obtain coating containing fluorine and nanoparticles, wherein SiO is 2 The mass of the powder, the volume of the deionized water and the volume ratio of the PTFE solution are (0.6-0.9) g: 10 ml: 5ml of the solution; s2, polishing the titanium alloy by using sand paper, carrying out ultrasonic cleaning on the surface of the aluminum alloy for 5min by using acetone, absolute ethyl alcohol and deionized water in sequence, drying the surface of the aluminum alloy, spraying the coating on the surface of the titanium alloy, and curing the surface coating to obtain the super-hydrophobic coating. It has the advantages of simple process and excellent performance.)
1. Titanium alloy surface PTFE-SiO2The preparation method of the super-hydrophobic coating is characterized by comprising the following steps:
s1, taking dry SiO2Mixing the powder with deionized water, stirring with a magnetic stirrer at 30 deg.C and 300r/min for 15min, adding PTFE solution into the solution, stirring with a magnetic stirrer at 30 deg.C and 300r/min for 15min to obtain coating containing fluorine and nanoparticles,
wherein SiO is2The mass of the powder, the volume of the deionized water and the volume ratio of the PTFE solution are (0.6-0.9) g: 10 ml: 5ml of the solution;
s2, polishing the titanium alloy by using sand paper, carrying out ultrasonic cleaning on the surface of the aluminum alloy for 5min by using acetone, absolute ethyl alcohol and deionized water in sequence, drying the surface of the aluminum alloy, spraying the coating on the surface of the titanium alloy, and curing the surface coating to obtain the super-hydrophobic coating.
2. Titanium alloy surface PTFE-SiO according to claim 12The method for preparing the super-hydrophobic coating is characterized in that, in step S1, dried SiO2The powder preparation method comprises the following steps:
spherical SiO2Mixing the granules with anhydrous ethanol, dripping into KH550, stirring the mixed solution with magnetic stirrer for 15min, and vacuum dryingMaintaining the temperature in the box at 60 ℃ for 24 hours to ensure that SiO is generated2The granules were dried to a powder form.
3. Titanium alloy surface PTFE-SiO according to claim 22The preparation method of the super-hydrophobic coating is characterized in that the spherical SiO2The diameter of the particles was 100 nm.
4. Titanium alloy surface PTFE-SiO according to claim 12The method for preparing the super-hydrophobic coating is characterized in that in step S1, SiO is used2The mass of the powder, the volume of the deionized water and the volume ratio of the PTFE solution are 0.8 g: 10 ml: 5 ml.
5. Titanium alloy surface PTFE-SiO according to claim 12The preparation method of the super-hydrophobic coating is characterized in that in step S2, the surface of the titanium alloy is dried by using a vacuum drying oven.
6. Titanium alloy surface PTFE-SiO according to claim 12The preparation method of the super-hydrophobic coating is characterized in that in step S2, 600# and 1000# sandpaper is used for grinding the surface of the titanium alloy.
7. Titanium alloy surface PTFE-SiO according to claim 12The preparation method of the super-hydrophobic coating is characterized in that in the step S2, after the coating is sprayed, the substrate is kept stand for 24 hours at the room temperature of 26 ℃ to completely cure the surface coating.
Technical Field
The invention mainly relates to the related technical field of super-hydrophobic coatings, in particular to PTFE-SiO on the surface of a titanium alloy2Superhydrophobic coatingsThe preparation method of (1).
Background
The super-hydrophobic coating is a coating with the static contact angle of the surface of the coating and water being more than 150 degrees and the rolling contact angle being less than 10 degrees. The super-hydrophobic coating has excellent surface properties such as self-cleaning, water resistance, ice resistance, pollution prevention and the like, so that the super-hydrophobic coating has wide application prospects in social production activities.
Common methods for preparing the super-hydrophobic coating include a self-assembly method, a particle filling method, a sol-gel method, an electrochemical deposition method and the like, but the complex process flow and the high cost make the current methods difficult to realize large-scale industrial application. Therefore, the research on the super-hydrophobic coating which has simpler process, lower cost, large-scale production and good performance and the preparation method thereof has important application value and practical significance.
Disclosure of Invention
The invention aims to provide PTFE-SiO on the surface of a titanium alloy2The preparation method of the super-hydrophobic coating has the advantages that the preparation cost of the super-hydrophobic coating is lower and the super-hydrophobic coating has excellent hydrophobicity through a simple process flow, so that the industrial application of the super-hydrophobic coating in the fields of aviation and the like becomes practical.
In order to achieve the purpose, the invention is realized by the following technical scheme:
titanium alloy surface PTFE-SiO2The preparation method of the super-hydrophobic coating comprises the following steps:
s1, taking dry SiO2Mixing the powder with deionized water, stirring with a magnetic stirrer at 30 deg.C and 300r/min for 15min, adding PTFE solution into the solution, stirring with a magnetic stirrer at 30 deg.C and 300r/min for 15min to obtain coating containing fluorine and nanoparticles,
wherein SiO is2The mass of the powder, the volume of the deionized water and the volume ratio of the PTFE solution are (0.6-0.9) g: 10 ml: 5ml of the solution;
s2, polishing the titanium alloy by using sand paper, carrying out ultrasonic cleaning on the surface of the aluminum alloy for 5min by using acetone, absolute ethyl alcohol and deionized water in sequence, drying the surface of the aluminum alloy, spraying the coating on the surface of the titanium alloy, and curing the surface coating to obtain the super-hydrophobic coating.
Further, in step S1, the dried SiO2The powder preparation method comprises the following steps:
spherical SiO2Mixing the granules with anhydrous ethanol, dripping into KH550, stirring the mixed solution with magnetic stirrer for 15min, placing the mixed solution into vacuum drying oven, and maintaining at 60 deg.C for 24 hr to obtain SiO2The granules were dried to a powder form.
Further, the spherical SiO2The diameter of the particles was 100 nm.
Further, in step S1, SiO2The mass of the powder, the volume of the deionized water and the volume ratio of the PTFE solution are 0.8 g: 10 ml: 5 ml.
Further, in step S2, the titanium alloy surface is dried by a vacuum drying oven.
Further, in step S2, the titanium alloy surface is ground using 600# and 1000# sandpaper.
Further, in step S2, after the paint is sprayed, the substrate is left standing at room temperature of 26 ℃ for 24 hours to completely cure the surface coating.
Compared with the prior art, the invention has the beneficial effects that:
the super-hydrophobic coating prepared by the method has a micro-nano structure, is simple in manufacturing process, has a good coating effect, and can be industrially applied to the fields of aviation and the like in a large scale.
Drawings
FIG. 1 is a scanning electron microscope image of the surface of each coating layer in example 1 of the present invention.
FIG. 2 is a graph showing the change in the bounce height of a water droplet on the surface of a coating layer with time in example 2 of the present invention.
FIG. 3 is a schematic diagram of the corrosion test procedure of the coating in example 2 of the present invention.
FIG. 4 is a schematic view showing the microstructure of the surface of the coating layer after etching in example 2 of the present invention.
FIG. 5 is a schematic view showing the microstructure of the surface of the coating layer in example 2 of the present invention.
FIG. 6 is a graph showing the freezing process of water droplets on the surface of the coating layer in example 2 of the present invention.
Detailed Description
The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and these equivalents also fall within the scope of the present application.
Example 1:
the embodiment of the invention provides PTFE-SiO on the surface of a titanium alloy2The preparation method of the super-hydrophobic coating mainly comprises two steps of preparation of the coating and spraying of the coating.
The preparation process of the coating is as follows.
Spherical SiO with the diameter of 100nm2Mixing the granules with anhydrous ethanol, dripping into trace KH550, stirring the mixed solution with magnetic stirrer for 15min, placing the mixed solution into vacuum drying oven, and maintaining at 60 deg.C for 24 hr to obtain SiO2The granules were dried to a powder form. 0.2g, 0.5g, 0.8g and 1.1g of dried SiO were taken2Mixing the powder with 10ml of deionized water, stirring for 15min at 30 ℃ and 300r/min by using a magnetic stirrer, adding 5ml of PTFE solution into the solution, and continuously stirring for 15min at 30 ℃ and 300r/min by using the magnetic stirrer to obtain the multi-component coating containing fluorine and nano particles.
The spraying process of the coating is as follows.
Grinding a titanium alloy (Ti6Al4V) with the thickness of 30mm multiplied by 5mm multiplied by 2mm by using No. 600 and No. 1000 abrasive paper until the surface has no obvious scratch; and (3) ultrasonically cleaning the surface of the aluminum alloy for 5min by using acetone, absolute ethyl alcohol and deionized water in sequence, and then drying the surface of the aluminum alloy by using a vacuum drying oven.
The coating is sprayed onto the surface of the aircraft aluminum alloy substrate using a spray gun. And after spraying, standing the base material for 24 hours at the room temperature of 26 ℃ to completely cure the surface coating.
In example 1, the SiO solid particles were passed through 0.2g, 0.5g, 0.8g and 1.1g, respectively, after drying2Powder and 10ml of deionized water5ml of PTFE solution were mixed. Each coating prepared is shown in fig. 1, and fig. 1 is a scanning electron microscope image magnified 100 times after the coating is cured. In FIG. 1, the electron micrographs show the case where (a) is 0.2g, (b) is 0.5g, (c) is 0.8g, and (d) is 1.1 g.
It is understood that in FIG. 1(a), SiO is used2The content is low, the dispersion degree in the coating is high, and therefore, the surface of the formed coating is full of pits like coral tufts. In FIG. 1(b), SiO2The content is relatively increased, the surface of the coating has a micro-nano structure, but the distribution of the micro-nano structure is not uniform; in fig. 1(c), the coating surface forms a micro-nano structure with obvious uniform distribution, which is very similar to the structure of the lotus leaf surface under the microscopic view. In FIG. 1(d), SiO2Too high a level may result in pressing together, which may result in substantial ravines being formed after the coating surface has cured. Table 1 below shows four different SiO2The static contact angle and the rolling angle of the surface of the coating in amounts.
TABLE 1 different SiO2Static contact angle and sliding angle of the surface of the coating in the amount
As is clear from the data in FIG. 1 and Table 1, the SiO content is "0.8 g SiO2+10ml H2O +5ml PTFE "formed a coating with very strong hydrophobicity on the substrate surface.
Example 2:
this example is based on "0.8 g SiO2The water impact resistance, acid and alkali corrosion resistance and frost resistance at low temperature of the coating are proved by the coating component prepared by +10ml of H2O +5ml of PTFE ".
For the water impact resistance of the coating, the titanium alloy base material containing the super-hydrophobic coating is placed on the surface of a semiconductor refrigeration platform, and the distance between the needle head of the micro quantitative pump and the surface of the base material is 40 mm. The micro metering pump was operated at an output flow of 100mL/h, so that water droplets of diameters Xmm and 2.5mm continuously impacted the coating surface for 30 min.
The contact of the water droplets with the coating surface and the bouncing process at room temperature are shown in fig. 3.
The static contact angles of the coating surfaces after the test are shown in table 2.
Table 2 static contact angle change of the coated surface after water impact test.
It can be seen that the coating has excellent resistance to water impact.
For the acid and alkali corrosion resistance of the coating, in order to avoid the bouncing of the liquid drops on the surface of the coating, the liquid drops fall to be in contact with the surface of the coating at an extremely low height and roll along the surface of the coating. The substrate rests on the small raised platform, and the surface of the substrate and the semiconductor refrigerating platform form an included angle X. The droplets were generated with a frequency x, diameter x, and duration 300 min.
Referring to fig. 3 and 4, it can be seen that although the droplets can still roll along the coating surface after 300min of etching, the microstructure of the coating surface is damaged to some extent. Especially na (oh) and HCL, the microstructure of part of the surface area of the coating has become blurred. And H2SO4With HNO3The microstructure of the coating was relatively less disrupted with the etched surface, with the HNO3 etched surface microstructure still being clear. The surface was further analyzed for static contact angle after corrosion of the coating as shown in table 3.
TABLE 3 static contact angle of the coating surface after corrosion
The surface contact angle condition shows that although corrosion causes some degree of destruction of the microstructure of the coating surface, it does not cause failure of the superhydrophobic properties of the coating surface. The surface with blurred microstructure is magnified to a factor of 500 as shown in fig. 5.
It can be seen that the surface of the fuzzy micro-nano structure still has an obvious secondary micro-nano structure, so that the static contact angle of the surface of the coating is not greatly reduced, and the coating still has super-hydrophobic performance.
The anti-icing performance of the coating. The temperature of the surface of the semiconductor refrigeration platform is set to-10 ℃ and-20 ℃, two water drops with the diameter X are dropped on the surfaces of the two samples, the change condition of the water drops on the surface of the coating is observed, and the anti-icing capacity of the surface of the coating is tested. As shown in fig. 6. It is known that the coating surface has the effect of reducing the freezing temperature and delaying freezing.
In conclusion, the coating prepared by the method has good hydrophobicity, water impact resistance, acid and alkali corrosion resistance and frost resistance at low temperature, and can be practically applied in industry.