Solvent-free room-temperature curable organic/silicone hybrid coating with high transparency and durable antifouling ability

Coatings with liquid repellent or antifouling ability are highly desirable in various fields. However, it is still a challenge to prepare solvent-free and room-temperature curable coating with high hardness, great antifouling performance, durability and large-area applicability. Herein, a novel strategy is reported to prepare organic/silicone hybrid coating by using amine-closed hyperbranched polysiloxane (SHPSi) as a latent curing, and diisocyanate containing a small amount of PFPE as an organic connecting part. In the presence of moisture, the mixture of the latent curing and the organic part can be cured at room temperature, and the smooth and low surface energy coating was obtained. The prepared hybrid coating had great transparency with the transmittance over 90 %. Due to the migration tendency of the PFPE to the air side, the surface energy of the hybrid coating decreased from 35.9 mJ/m² to 13.5 mJ/m² with 0.5 wt% PFPE, and the hybrid coating exhibited excellent antifouling ability. Besides, the hybrid coating can maintain the antifouling ability even after 2000 abrasion cycles. Furthermore, the great stability for various corrosive solutions and UV radiation was also achieved. More interestingly, the hybrid coating can be employed to protect various substrates, and large-area substrate was also realized. Therefore, this work would promote the application of high-performance organic/silicone hybrid coatings in an eco-friendly way.