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.