導電塗層防止海生物附著之研究

The Conductive Coatings Used as Anode for Preventing Biofouling Problem

本研究在發展使用不同成份之導電塗料在海水環境中，外加陽極電位下電解生成自由氯，以防止海生物附著。本研究測試導電塗料黏結劑有三種分別為：聚胺基甲酸酯樹脂、矽酸乙酯樹脂及矽酸鹽樹脂，而導電塗料添加物則採用二種不同粒徑：3~5 µm及40~45 µm的石墨粉。發現使用粒徑3~5 µm石墨粉及矽酸鹽樹脂所形成之導電塗料，最低的電阻率可達到0.08 Q-cm，能夠在較小之外加電壓下有效電解生成自由氯及提昇電解效率。另外，此種導電塗料經實際在3.5% NaCl水溶液中定電壓1.4V（SCE）電解測試下，不但可有效電解生成出過量的自由氯，也在耐久性的方面有著不錯的表現。

The purpose of this project is to develop conductive coatings that used as anode to produce free chlorine to prevent biofouling under anodic potential in the seawater. Three different conductive coating binders are polyurethane resin, ethyl silicate resin, and silicate resin. The additive of the conductive coating is graphite powders having particle sizes : 3~5 µm and 40~45 µm. In the electric resistivity test, the conductive coating which used 3~5 µm graphite powder as additive and silicate resin as binder which has the lowest electric resistivity (0.08 Ω-cm). Thus the conductive coating using 3~5 µm graphite powder as additive and silicate resin as binder are suitable to produce free chlorine in the seawater. Besides, a voltage of 1.4V (SCE) is applied for the same conductive coating in the solution. During the 14-day electrolysis test, the conductive coating as anode can produce proper free chlorine and has good durability. In the second phase, we will test the conductive coating in the field.