The antifouling effect of the coating is mainly manifested in broad spectrum and long-term effect. The ideal antifouling coating should have a protective effect on both plant and animal attachment organisms and have a long antifouling effect. Today's antifouling coatings are effective from 1 to 5 years.
The factors that determine the antifouling effect are as follows:
1 Anti-fouling agent content. It is desirable that the antifouling agent be as high as possible in order to have a longer shelf life.
2 Release of antifouling agent. The release of the antifouling agent must first be maintained above the critical concentration effective to kill the attached organisms, and the release rate should be uniform.
3 Surface free energy (surface tension) of the binder. Coatings with low surface tension are not prone to adhesion, and even if there is adhesion, marine organisms are not firmly attached and are easily removed or washed away by flowing seawater.
4 The base material has a low modulus of elasticity. Such fouling can be stripped under the action of a small external force.
5 The smoothness of the coating. The smoother the coating, the lower the frictional resistance, and the less likely marine organisms to adhere, which is more important for low surface free energy coatings.
6 pH of the coating. The coating may affect the pH of the nearby seawater. The greater the difference between the pH of the seawater near the surface of the coating and the normal seawater, the less likely the marine organisms will adhere.
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