Long time super-hydrophobic fouling release coating with the incorporation of lubricant

Fouling Release Coatings Based on Acrylate–MQ Silicone Copolymers Incorporated with Non-Reactive Phenylmethylsilicone Oil

“…The commercial application of the FR coatings-based PDMS is limited due to the poor mechanical properties. Therefore, the PDMS elastomer must be reinforced and modified [ 6 , 11 , 14 , 23 , 39 ]. The stress–strain curves of the coatings are shown in Figure 6 by measuring the dumbbell-shaped samples from the cured film, and the related mechanical properties are listed in Table 3 .…”

“…The antifouling properties of the coating via the biofilm adhesion assay (marine bacteria) were evaluated about which a detailed description of the test was supplied elsewhere [ 23 , 30 ]. The brief description was as follows: six coated tin plate samples were immersed in 800 mL fresh seawater (China Yellow Sea) at 28 °C for 24 h, three samples were rinsed softly in sterile deionized water to remove unsettled bacteria, and the rest of the samples were washed by a CB-8L-C high-pressure water gun (Haishu Chebo Industry & Trade Co., Ltd., Ningbo, China) with 0.1 MPa for 120 s [ 23 ]; subsequently, samples were dyed with crystal violet solution (0.5 wt.%); after immersion in acetic acid solution (36 wt.%) for 10 min, the absorbance of the supernatant after centrifugation was measured at fixed wavelengths (590 nm) to evaluate the concentration of crystal violet via using an ultraviolet-visible spectrophotometer (NYSE: A, Palo Alto, CA, USA). The antifouling performance would be characterized by analyzing the absorbance of liquid, while the removal rate that marine bacteria adhered to the coating surface was also determined by Formula (3), where D a , D b , and R represent the absorbance of washed samples, the absorbance of rinsed samples, and the removal rate of biofilm adhesion.…”

“…Additionally, the classification of the above eco-friendly antifouling coatings is not strictly limited. Various functional polymer antifouling coatings developed in recent years often have multiple antifouling functions [ 1 , 11 , 23 , 24 ].…”

“…FR coating is defined as one that cannot inhibit the attachment of fouling organisms, yet the interfacial bond between organisms and surface is severely weakened with low surface free energy (20–27 mJ/m 2 of Baier curve) [ 6 , 23 ]. Besides, FR coatings usually have low elastic moduli [ 5 ].…”

“…Currently, the incorporation of non-reactive silicone oil has aroused great interest in FR coating [ 28 , 29 , 30 , 31 , 32 , 33 , 34 ], which has been proved to be a non-toxic additive for the marine environment. Non-reactive silicone oil finally leaches to the surface between the coating and seawater, which can not only effectively improve the antifouling performance, especially the inhibition of barnacles’ adhesion [ 32 ], but also act as the flexible protective layer on the surface, to ensure the long-term smoothness of the coatings [ 23 ]. Therefore, non-reactive silicone oil additive has a wide application prospect in the FR coatings based on silicone.…”