Abstract
Based on polydimethylsiloxane, three-component coatings were prepared with different content of luminescence powder. The results showed that the illuminance of coatings increases with the content of luminescence powder, decays exponentially with the afterglow time, increases exponentially with the increase of exposure time. The afterglow illuminance augments with irradiated light illuminance. All coatings are hydrophobic and oleophilic. Surface free energy decreases with the increase of luminescence powder. They have highest impact-resistance and bend flexibility. The luminescence powder does not change obviously the shore hardness, tensile breaking strength, breaking elongation rate, elastic modular and roughness of coatings. The static test panels in sea generally could be covered obviously by biofouling including sponges, bryophytes and mussels, hydra, kelp, green algae after 2 months of immersion during growing season. But it never found that the barnacle attached on the coating surface during 4 years of immersion test. The static anti-fouling ability of the coatings is very limited. In addition, the sea creatures attached on the coating surface can be easily removed; even attached organisms will fall off and expose again the smooth coating surface. Consequently, all coatings with long-life afterglow fluorescent have a significant effect on preventing adhesion of barnacle and fouling-release performance.
Highlights
All man-made structures in marine environments suffer from the problem of biofouling that the unwanted growth of bacteria, algae and invertebrates
Surface properties of the PDMS coatings including surface free energy, elastic modulus and thickness are considered be important to the fouling release performance [3]
The aim of this study is to evaluate the influence of luminescence powder a Corresponding author: zzp@dlmu.edu.cn
Summary
All man-made structures in marine environments suffer from the problem of biofouling that the unwanted growth of bacteria, algae and invertebrates. It causes extra financial burdens, excessive consumption of energy, and contamination of the environment. Fouling release coatings present a surface which can reduce the adhesion strength of fouling organisms enabling cleaning by pressurized water jets or in some cases by hydrodynamic forces generated as the ship sailing [2]. Some researchers pointed out that incorporation of low molecular weight silicone oils into silicone coatings improves their fouling release properties [4]
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