Antimicrobial anticorrosive silicone resin coating with high adhesion and excellent mechanical properties

Silicone resin is increasingly recognized for its applications in anti-fouling and anti-corrosion coatings. However, its inherent limitations such as low strength , poor mechanical properties, and weak substrate adhesion, hinder its widespread application. This study introduces a novel antibacterial and anticorrosive silicone resin coating characterized by excellent mechanical properties, and strong adhesion . By modifying natural rosin with KH 560, we successfully synthesized a novel rosin modifier DAS and introduced it into methylphenylsilicone (MPSR) matrix through a hydrolysis-condensation method, producing antibacterial coatings with different DAS content (MPSR-x% DAS, x = 0, 3, 5, 7, 10). Especially the MPSR-7 % DAS coating reached 98.9 % against Staphylococcus aureus (S. aureus) and 94.5 % against Escherichia coli (E. coli) . In addition, in order to enhance the hardness and adhesion of the coating, a multifunctional siloxane crosslinker (MF-S) was introduced to form an MPSR-7 % DAS- y coating. The MPSR-7 %DAS- y ( y = 2–5) coating all achieved grade 1 adhesion, and the hardness of the MPSR-7 %DAS-4 coating exceeded 6H. The higher crosslinking density of MF-S contributes to a denser coating and improves the long-term corrosion resistance of the coating. This study provides potential progress for the development of coatings with enhanced antifouling and anti-corrosion properties. • Prepared the natural rosin-modifying agents. • The hardness of the coating reaches 6H, and the adhesion reaches level 1. • The coating is antibacterial and self-cleaning.