Preparation and Study of Fluorosilyl Methacrylate Polymer Emulsion and Modified Coating Based on Perfluorinated Branched Short Chains

Fluorinated methacrylate polymers have been widely applied in the coating field due to their low surface energy, high thermal stability, and high chemical stability. However, traditional fluorinated methacrylate polymers contain environmentally unfriendly long fluorocarbon chain groups. These polymers are extremely difficult to degrade and can easily cause harm to the environment and human health. For this purpose, this paper took fluorinated methacrylate containing perfluorinated branched short chains as the main fluorinated monomer to obtain the polymer emulsions PFSA and their corresponding coating. Then, the emulsions were modified with silica sol to construct the PFSA4/SiO2-modified coating. The structures of the emulsion and the micelle state were characterized. The surface morphology, surface chemical composition, wetting performance, acid and alkali resistance, and self-cleaning performance of the constructed coating were studied. The results showed that PFSA had high hydrophobicity, with its water contact angle (WCA) value ranging from 95.2° to 119.3°. After modification with silica sol, the contact angle increased, being greater than 150°, with the highest reaching 158.4°, achieving a superhydrophobic state. And the PFSA4/SiO2-modified coatings possessed high acid and alkali resistance, as well as self-cleaning properties.