Synthesis Of New Antifouling Agent And Its Application In Coating

Antifouling paints is the most simple and effective method to prevent marine organisms attached. From the traditional type to the present non-toxic antifouling coatings, Exploitation of efficient and environment friendly antifouling paint is very important. The International Maritime Organization (IMO) began to imply a ban on the use of organic tin coating from January 1,2003 and such antifouling paint is totally prohibited to use on January 1,2008.Therefore, in recent years, many countries begin to develop new antifouling coatings and new antifouling agent.Gramine is a kind of alkaloids, it has high sterilization performance. This thesis, Gramine as the object of study, as a new effective and environmentally friendly antifouling agent is used in paints. Gramine antifouling agent's efficient and environment-friendly features makes the marine anti-fouling coatings having wide application prospect.In this paper,Gramine,2-bromo Gramine are synthesized and applied to the anti-fouling coating. Based on the reaction time, reaction temperature, pH of the main factors affecting of the reaction system, determine the optimal synthetic process:the pH value of 11, reaction temperature for 30-35 degrees Celsius, the reaction time for 6 hours.In this paper, new compounds two-hydroxy Gramine is first synthesized, and discusse the reaction mechanism of using Mannicci reaction to Synthesis two-hydroxy Gramine. With indoles,diethanolamine and formaldehyde as raw materials, in acid catalyzed synthesis of two-hydroxy Gramine. By examining the temperature, time, pH value of the three main factors on the reaction, using the orthogonal experiment gives the best synthesis conditions:reaction time 6h, the reaction temperature 25℃, pH= 11; Using FT-IR, 1HNMR to characte the structure of the anti-fouling agents, finalized two-hydroxy Gramine chemical formula C13H18O2N2, molecular weight 234g/mol, melting point 44℃, Using the antifouling agent to make sterilization experiment, the diameter of inhibiting ring increasing around 2cm. The result shows that the antifouling agent has obvious antifouling properties.Finally, the synthesized 2-hydroxy-Gramine as anti-fouling agents is added to the coating, to compound antifouling paint.The basic properties of coating and antifouling properties are discussed, meetting the basic requirements.The first synthesized 2-hydroxy-Gramine is a kind of environment-friendly organic antifouling agent. Due to its structural properties,2-hydroxy-Gramine bactericidal effect is obvious.2-hydroxy Gramine structure contains two hydroxyl groups, so it can be grafted onto the resin in the way of chemical reaction of polymer or be used as synthetic resin monomer. Achieve to the purpose, resin itself has an effect of pollution prevention, of great scientific value.