Preparation And Application Of Low Surface Energy Of Fluorosilicone Modified Polyester Coatings

Fluorosilicone has excellent thermal oxidation stability, cold resistance, corrosion resistance, electrical insulation, hydrophobic and anti-sticking propeties. But it’s poor mechanical performance, poor solvent resistance and the long curing time and high curing temperature, limit its application in more fields. Polyester resin exhibits excellent impact resistance and adhesion property, but pure polyester resin also exhibits rather poor thermal stability, water repellence and workability. Considering the complementary properties of fluorosilicone resin and polyester resin, it is of great interest to develop new fluorosilicone-modified resins with excellent integrated properties of fluorsilicone-based materials and good performance of polyester resins.In this paper, fluorosilicone resin was prepared by silicone monomers and fluorine containing silicone monomer through hydrolysis-co-condensation method, and different content of fluorosilicone resins were employed to modified polyester resin, then sprayed and cured at 150℃ for 3h. The structure, wettability, morphology, and thermal properties of the modified resins have been characterized by FT-IR, contact angle measurements, XPS, AFM and TG analysis. The non-sticking performance, water repellence, hardness, and adhesion property of the fluorosilicone modified polyester resin films were also studied by standard methods. The results show that the heat resistance, hydro-oleophobicity, water repellence, no-sticking performance and hardness of the modified resin increased with the increase of fluorosilicone content. The modified resin displayed great heat resistance, water and organics repellence due to the native high bond energy and low surface free energy of fluorosilicone. For the modified resin containing 50 wt% of fluorosilicone resin (F5SP50), the starting decomposition temperature Td10 (10% weight loss) reached 360℃, which was 40°C higher than that of neat PET. Yellowing test show that it can with stand high temperature over 280℃ for a long time.In order to obtain superhydrophobic fluorosilicone modified polyester coatings and expand its application in the field of anti-fogging/frosting. In this paper, alumium alloy etched by HCl first, and then nano-SiO2 was deposited on the surface of the etched alumium. The alumium surface becomes superhydrophobic after sprayed the modified resin. The morphology and roughness of the etched surface was measured by SEM and AFM, the water contact angle, slide angle, anti-fogging, anti-frosting and anti-icing performance were also measured by standard methods. The alumium alloy etched by 3mol/L HCl for 20min and deposited with lwt% nano-silica shows best superhydrophobicity. The water contact angle reaches 157°and the slide angle lower than 1°. The superhydrophobic surface shows perfect anti-fogging, anti-frosting and anti-icing performance as it can effectively delay freezing time and reduce the ice adhession on the superhydrophobic surface. The superhydrophobic surface also possesses excellent durability ownig to the chemical combination of fluorosilicone modified polyester resin and etched alumium surface.