Isothiazolinone Grafted Acrylic Resin And Hydrolysis Study

Benzisothiazolin-3-one(BIT) is an efficient and broad-spectrum biocide. It can effectively kill kinds of bacterias and fungus. Laboratory fouling organisms' inhibition experiments showed that BIT also has nice inhibition on marine alga such as diatoms and chlorella. BIT has wide prospect application in Marine antifouling coatings.In this paper, we firstly synthetize acrylate resin from acrylate monomers. Then, connected a carboxyl to BIT through reacting with maleic anhydride and obtained 4-BIT-4-ketone-2-acid. Then, we grafted it to acrylate resin by O-Zn-O bond and acquared BIT acrylate zinc resin. Besides, we studied hydrolysis mechanism of BIT acrylate zinc resin through its surface evolution while soaking in seawater and exudation analysis as well as antifouling performance through laboratory fouling organisms' inhibition experiments and marine antifouling experiments.Main conclusions are as follows:1. We synthetized acrylate resin from acrylate monomers and synthetized 4-BIT-4-ketone-2-acid from BIT and maleic anhydride as well as synthetized BIT acrylate zinc resin by grafting 4-BIT-4-ketone-2-acid and acrylate resin. We charactered each product by FT-IT and 1H-NMR and optimized all synthetize conditions. Further study showed that there is only the scheming reaction occurs during the grtafting process and produce BIT acrylate zinc resin.2. The surface of BIT acrylate zinc resin became smooth gradually while soaking in artificial seawater and the side chain of BIT acrylate zinc resin hydrolyzed by the segregation of O-Zn-O bond, which is much earlier than the backbone of BIT acrylate zinc resin. The Zn exudation rate is 30~40?g/(cm2·d), little more than that of rosin acrylate zinc resin, and the biocide exudation rate is 120~150?g/(cm2·d).3. The laboratory fouling organisms' inhibition experiments showed that the biological inhibition performance of BIT little decreased after grafted a carboxyl from maleic anhydride but BIT acrylate zinc resin shows excellent inhibition performance, especially on Pseudoalteromonas.sp and Vibrio.sp. Marine antifouling experiments showed BIT acrylate zinc resin and its coatings have outstanding antifouling property.