IntroductionFluorinated silane coupling agent was generated by reacting 2-(perfluorohexyl) ethyl methacrylate with trimethoxysilane, and then mechanically mixed with organic polysilazane (OPSZ) to obtain fluorinated modified OPSZ coating material. Finally, it was doped with micro nano SiO₂ particles and a durable superhydrophobic coating was prepared using a spray coating method that is widely applicable to various substrates. The prepared superhydrophobic coating still has a water contact angle of over 150° after undergoing 360 cm (load of 50 g) sandpaper friction or 12 tape peeling tests (adhesion of 1.75 N/cm), and water droplets can roll freely like lotus leaf surfaces. This work provides a simple method for preparing hydrophobic/superhydrophobic coatings with excellent durability, and has potential applications in anti fouling, anti-corrosion, and other aspects.MethodsAccording to the National Standard of China GB/T 9286—1998 “Cross cut test for film of paint and varnish”, the adhesion of the coating to the substrate was determined by cross-cutting the film. According to the National Standard of China GB/T 6739—2006 “Determination of film hardness by pencil method for paint and varnish”, the pencil hardness of the prepared coating was determined using a QHQ-A pencil hardness meter. According to the National Standard of China GB/T 23989—2009 “Determination of solvent resistance wiping resistance of coatings”, the resistance to MEK wiping off the prepared coating was determined. Tape peeling and sandpaper abrasion were used to test the mechanical stability of the coating. The 3M tape (adhesive, 1.75 N/m) was pressed onto the coated surface for 30 s with a 100 g loading before being entirely peeled off. In this experiment, we designated the press-peeling procedure as one testing cycle. Every two press-peeling cycles, the WCAs and SAs of the coating were monitored to evaluate the coating/substrate interfacial adhesive strength between the coating and the substrate. A 25 mm × 25 mm coating loaded with 50 g weights was placed face-to-face with sandpaper (1500 grit) and pulled horizontally at a uniform speed for the sandpaper abrasion test. The WCAs and SAs of the coatings were measured to demonstrate mechanical stability after each 40 cm abrasion distance.Aqueous solutions of pH = 1, 4, 7, 10, 13 were configured using H₂SO₄ and NaOH, in which the coatings were placed for 24 h and 3.5% NaCl solution for 72 h to measure the WCA and SA values and to assess their resistance to acid and alkali corrosion and salt. The samples were exposed to UV light for 48 hours to assess weathering resistance.The self-cleaning properties of the coatings were tested by contaminant removal experiments on the coated surfaces using carbon black nanoparticles as contaminants. In addition, it was evaluated how well the coatings cleaned themselves after exposure to red wine, cola, fruit juice, tea, milk, and coffee.Results and discussionA durable high-hydrophobic coating based on Fluorinated silane coupling agent-modified OPSZ was designed and realized through a one-step synthesis method and spraying process, with a water contact angle of up to 115° and the coating hardness of up to 4H and excellent adhesion By adding micro-nano SiO₂ particles, a superhydrophobic coating with a water contact angle of 156.3° and a rolling angle of 5.6° was successfully prepared. The superhydrophobic coating still had excellent hydrophobic properties after undergoing 12 cycles of tape stripping or 360 cm sandpaper rubbing test. This was due to the excellent anchoring characteristics of polysilazane and the excellent low surface energy of modified OPSZ, which resulted in good coating durability. After being doped with micro-nano SiO₂ particles, a durable superhydrophobic coating was prepared using a spraying method commonly applicable to various substratesConclusionsThis coating has the advantages of low process cost and convenient operation and can be used to develop large-scale, durable superhydrophobic coatings with broad application prospects and practical value. In conclusion, this study provides a new solution for developing new superhydrophobic coatings.