Synergistic effect of copolymeric resin grafted 1,2-benzisothiazol-3(2H)-one and heterocyclic groups as a marine antifouling coating

Photoinitiated Thiol-Ene Click Reaction for Preparation of Highly Adhesive and Mechanically Stable Silicone Coatings for Marine Antifouling and Anticorrosion

Marine biofouling and corrosion have become the main problems affecting the development of the marine industry. Silicone-based coatings have been widely used for antifouling and anticorrosion due to their low surface energy. However, the poor adhesion and low mechanical stability of these materials limit their application in complex marine environments. In this work, we presented a marine antifouling and anticorrosion coating named POSS-DMA@PDMS-TCM through photoinitiated thiol-ene click reaction combined with (mercaptopropyl) methylsiloxane dimethylsiloxane (PDMS-SH), dopamine methacrylamide (DMA), sulfhydryl-functionalized organosiloxanes (POSS-(SH)8), and N-(2,4,6-trichlorophenyl) maleimide (TCM). The POSS-DMA@PDMS-TCM coating exhibited strong stability and bonding ability both in air (2.17 MPa) and underwater (2.11 MPa) when the DMA content was 3 wt %. The high antibacterial (98.1% for Staphylococcus aureus and 99.5% for Escherichia coli) and antidiatom (94.5%) properties of the POSS-DMA@PDMS-TCM coatings have also been confirmed. Moreover, the POSS-DMA@PDMS-TCM coatings show excellent antifouling abilities in 120-day marine field tests, reducing fouling by 65.5% in comparison to the blank group. The coating also displayed superior anticorrosion performance with Ecorr values of -0.055 V, Icorr values of 7.67 × 10-6 , and Rp values of 3.10 × 105 Ω for Cu, which benefited from excellent chelating effect and liquid repellency. This study provides a novel strategy for the development of high-quality marine antifouling and anticorrosion coatings.

Preparation and antifouling performance of tin-free self-polishing antifouling coatings based on side-chain suspended indole derivative structural resins

Tin-free self-polishing antifouling coatings have the highest market share since organotin self-polishing antifouling coatings have been banned. However, its high dependence on cuprous oxide was found to have caused potential harm to the environment, making it necessary to improve the functionality of the resin. In this paper, a zinc acrylate resin with side chain hanging indole derivative structure was prepared by using N-(1H-5-bromoindole-3-methylene) (BIAM) with good biological activity as functional monomer. The functional resin with good antifouling performance was selected by antibacterial and algae inhibition experiments. The results showed that when the BIAM content was 9 %, the inhibition rates of the resin on E. coli and Prymnesium parvum reached 98 % and 90 %, respectively. Tin-free self-polishing antifouling coatings were prepared using the above resins as film-forming materials. The anti-protein adsorption performance and antifouling performance of the coating were tested by anti-protein adsorption experiment and real sea hanging plate experiment. The results showed that the coating containing indole derivative structure had good anti-protein adsorption performance and antifouling performance, and the higher the BIAM content, the better the anti-protein adsorption performance and marine antifouling performance.

Synthesis and Properties of Self-Polishing Antifouling Coatings Based on BIT-Acrylate Resins

Painting antifouling coatings is one of the most important methods to prevent marine biofouling. Acrylic resin is widely used in marine antifouling because of its excellent stickiness, water resistance, and film-forming capabilities. At present, the widely used acrylate antifouling coatings require a high concentration of cuprous oxide as antifoulant. The release and accumulation of copper ions are the main factors affecting the marine environment. In this study, BIT–allyl methacrylate (BM) and zinc acrylate (ZM) were selected as functional monomers copolymerized with methyl methacrylate (MMA) and butyl acrylate (BA) to prepare a series of BIT acrylate antifouling resins. The inhibitory effects of all resins against marine bacteria (S. aureus, V. coralliilyticus, and V. parahaemolyticus), marine algae (Chlorella, I. galbana, and C. curvisetus), and barnacle larvae were studied. Moreover, marine field tests on the BIT modified resin in coastal waters were conducted. The results demonstrate that the grafted BIT–zinc acrylate resin not only exhibits excellent antifouling properties but also a significant self-polishing performance, providing a novel strategy to design a long-term antifouling resin with stable antifoulant release.