Abstract：The silicone antifouling, coating with hydroxy-terminated polydimethylsiloxane as main film,and with the addition of methyl silicone oil with different molecular weight and different content, was prepared. The results show that water contact angles and diiodomethane contact angles become larger, while surface free energy becomes smaller with decreasing the molecular weight and increasing the content of silicone oil; the elastic modulus of coating becomes lower with reducing the molecular weight and the elastic modulus reaches the mininum while the content of methyl silicone oil is 13%(mass fraction) in part A. The relative adhesion force of biofouling increases with the increasing of molecular weight and reduces with the increasing of content of silicone oil; during the process of coatings immersing in seawater, the-CH3 in silicone oil can take hydrogen bonding effect with H2O molecular, thus results in the range of methyl peak becomes lager in FTIR spectra, and the hydrophobicity of silicone coatings decreases; all coatings are allowed to stand in air for one year, only the non-immersion silicone coating with the addition of methyl silicone oil of 1750 molecular weight are found the exudation of silicone oil and the amount of exudation is proportional to the amount of the addition.
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