The work aims to develop the anti-/de-icing coating that meets the requirements of aircraft skin protection technology. In this work, a kind of fluorine/silicon modified acrylic resin was synthesized by free radical polymerization. Firstly, its chemical structure was evaluated by the fourier infrared spectroscopy (FTIR). Then, a kind of aircraft skin coating was prepared with the synthetic resin. The coating was sprayed on the solid substrate and cured at room temperature. After curing, the coating showed excellent mechanical properties and anti-/de-icing performances. Then the micro-morphology, wettability and lubrication properties of coating surface were evaluated by scanning electron microscope (SEM), atomic force microscope (AFM), contact angle meter and friction tester, respectively. According to the requirements of aircraft skin coating, the mechanical properties, salt resistance, and liquid resistance were systematically tested. The anti-/de-icing was evaluated with low temperature simulation ice wind caves and ice adhesion testers. The fluorine-silicon modified acrylic resin was successfully synthesized, and a skin coating suitable for aircraft protection was prepared with this resin. The surface friction coefficient of the resin coating was ~0.075, which was only one-sixth of the surface friction coefficient of the organic glass plate. The mechanical properties of the skin coating were as follows: flexibility (cylindrical shaft) of 1mm, impact resistance of 50 cm, pencil hardness of 4H, adhesion (cros-cut, 3 mm spacing) of level 0, adhesion (circle-drawing, load 500 g) of level 1, adhesion (pull -off ) of 7.5 MPa, abrasion resistance (1 000 r/min, load 1 kg) of 28.1 mg, high temperature resistance (150 ℃, 48 h), water resistance (23 ℃, 7 d) and oil resistance ( phosphate hydraulic oil: 23 ℃, 30 d; MIL-L-7808 oil; 23 ℃, 30 d; reference oil B: 23 ℃, 14 d) without obvious abnormality, gloss (60º) of 90.3, dirt resistance of level 0, water contact angle of 105°, no abnormalities for salt resistance and low temperature resistance. In addition, the adhesion (cros-cut, 3 mm spacing) after testing is not greater than level 1, the divestiture width of resistance to rain erosion is 0.5-2.0 mm, the ice attachment strength (150 kPa) is significantly smaller than that commercial skin coatings (250 kPa), and the anti-/de-icing effect is obvious. The skin protection coating prepared by fluorine/silicon modified acrylic resin not only has excellent mechanical properties, good resistance to liquid, corrosion resistance, high/low temperature impact resistance and resistance to rain erosion, but also has the advantages of good hydrophobic effects, strong stain resistance, smooth surface, and low frictional coefficient. More importantly, based on the low surface of the coating and the self-lubrication characteristics, the coating surface shows a lower ice adhesion strength, which is especially suitable for the aircraft skin protection, and really appropriate for the afterflow zone of aircraft wing.
Key words
fluorine/silicon modified resin /
skin coating /
hydrophobicity /
low surface energy /
self-lubrication /
anti-/de-icing
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Funding
National Natural Science Foundation of China (52475229); Key Research and Development Program of Gansu (22yf7ga049); Fund of Innovation Alliance of Advanced Aerospace Materials
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