Influence of Phenylmethylsilicone Oil on Anti-Fouling and Drag-Reduction Performance of Silicone Composite Coatings

Qiang Yang,Hongyang Zhang,Zhanping Zhang,Yuhong Qi

doi:10.3390/coatings10121239

Qiang Yang, Hongyang Zhang + Show 2 more

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https://doi.org/10.3390/coatings10121239

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Journal: Coatings	Publication Date: Dec 17, 2020
Citations: 4	License type: CC BY 4.0

Affiliation: Dalian Maritime University

Abstract

In this study, we explore the effect of phenylmethylsilicone oil (PSO) addition amount and viscosity in a fouling release coating based on polydimethylsiloxane (PDMS). The surface properties, mechanical properties, anti-fouling and drag-reduction performance of the coating were studied. Meanwhile the influence of the basic properties of the coating on the anti-fouling and drag-reduction performance was also studied. Subsequently, the antifouling performance of the coating was investigated by the Navicula Tenera and bacteria adhesion test. As a result, the high content of PSO paint has a high foul removal rate. The incorporation of PSO into paint can reduce the elastic modulus and surface energy of the coating to reduce its relative adhesion factor (RAF). The lower the RAF, the better the antifouling effect of the coating. The drag-reduction performance of the coating was verified by the torque selection experiment, and the results showed that incorporation of PSO into paint can enhance the elongation and hydrophobicity of the coating, thereby increasing the drag reduction rate of the coating.

Highlights

In recent years, the concept of energy saving and emission reduction has gradually attracted people’s attention
PDMS is hard to apply under dynamic conditions, because it is difficult to inhibit the adhesion of diatoms
The results show that the incorporation of phenylmethylsilicone oil (PSO) can improve the hydrophobicity of the coating to a certain extent

Summary

Introduction

The concept of energy saving and emission reduction has gradually attracted people’s attention. The most efficient way to save energy is to reduce the forward drag of ships [1]. While the ship is moving forward, the seawater drag, and the adhesion of marine fouling organisms like diatoms and bacteria, they both accelerate biological corrosion and increases surface roughness [2,3,4,5]. Polydimethylsiloxane (PDMS), an elastomer, has low surface energy and roughness, which reduces the adhesion between it and marine organism [6,7,8]. The PDMS has a high interfacial energy with water, it is beneficial to adhesion bacteria and sludge, and limits the use of the organic silicon coating under static conditions [9]. Even if the ship speed is as high as 30 knots, the diatoms may still adhere firmly to the coating surface [10]

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