An Antifouling Emulsion Coating Based On2,3-epoxy-2-methyl-1,4-naphthoquinone

Now, most antifouling coatings still suffered from many problems, especially the atmospheric and marine pollution caused by VOCs emission and toxic biocides release. As concerning such disadvantages of antifouling coating, a novel silicone-acrylate self-emulsifying emulsion which can be used as film former of antifouling coating was designed and investigated, and the application of novel biocide-2,3-epoxy-2-methyl-1,4-naphthoquinone (ME) in the anfiouling coating was also studied. A high efficient, novel antifouling coating without VOCs emission was successfully formulated.Generally, the unpolymerizable emulsifiers in traditional emulsion show very poor water resistance property which is fatal to the antifouling coating. To conquer such problem, in this paper, a novel silicone-acrylate emulsion was synthesized using polymerizable emulsifiers4-propyl-1-(1-propenyl) sulfosuccinate (M-10S) and allyl octylphenyl polyoxyethylene glycol ether (AE-200). The emulsion was characterized by Fourier transform infrared spectroscopy (FT-IR), differential scanning calorimetry (DSC) and transmission electron microscopy micrograph (TEM). The optimal polymerization condition is13.0wt%MMA,13.0wt%BA,5.0wt%VTES,0.7wt%compound emulsifier-M-10S:AE-200=1:1(wt/wt),0.3wt%ammonium persulfate (APS),80℃of polymerization temperature,3h of reaction time. The Z-average particle size of the emulsion is62.4nm. The performances of the film prepared from the emulsion were excellent. This novel silicone-acrylate emulision met the commercial standards of film-forming polymer for antifouling coating.Antifouling performances of Vitamin K3products were studied in this paper, and ME was employed as main antifoulant. In the mean time, the antifouling additives matching with ME were also studied. In order to control the release of main antifoulant-ME from the coating film, and prepare the antifouling coating with long service life, polyacrylate emulsion was applied as wall material to microcapsulate ME. Shell material component and the effect of the preparation procedure on the microcapsule particle size were studied. TEM was used to characterize ME microcapsules. The results showed that ME was successfully microencapsulated and the average particle size was only338.4nm by multistep feeding in the presence of emulsifiers-OP-10:SDS=1:1(wt/wt). The optimal shell material component is MMA:BA:AA=26:45:29(wt:wt:wt). When the core/shell mass ratio of microcapsules was1:7, the release rate of ME from the coating was steady.In this paper, a waterborne antifouling coating for ship hull protection was prepared by employing novel synthesized silicone-acrylate emulsion as film former and ME microcapsules as main antifoulant. Physical and mechanical properties, antifouling performance were tested. The adhesion of the coating film reaches1grade and the impact resistance is over50cm·kg, The optimal recipe of the waterborne antifouling coating is36.6wt%ME microcapsules,0.5wt%Zinc pyrithione,2.0wt%nano-sized ZnO and0.5wt%nano-sized TiO2. The antifouling activity of the coating film is excellent. The service life of the coating film can last for3-4years. By the application of water as dispersion medium and environmental friendly antifouling agents, there is no VOCs emission from the environmental friendly coating.Based on the short service life of the antifouling coating used on marine cage, and the special flexibility of the netting, a novel antifouling coating was studied and prepared with rosin, acetone, ME, pelargonic acid vanillyamide (PAV) and plasticizer. The observation on treated netting hung up for3months in the sea showed that the antifouling efficiency of the coating made with plasticizers-dinormal octyl phthalate:chlorcosane=1:1(wt/wt) in the presence of5.0wt%PAV and2.5wt%ME was excellent, and there was no weight gain of the netting. The service life of the coatin film can last at least10months. Meanwhile the coating film was environmental friendly.