On the one hand, the domestic market for antifouling paints for large-scale ocean-going ships has been monopolized by international multinational companies. On the other hand, my country’s own antifouling coating technology has been in a position of backwardness, imitating and tracking development for a long time. Therefore, my country’s own brand of grade 5 titanium plate Products can only seek survival and development in the cracks between warship painting and the offshore fishing market. So far, the antifouling paint products of our country's independent brands are still dominated by traditional soluble antifouling paints such as blue antifouling paint and chlorinated rubber antifouling paint, and such antifouling paints have been banned and abandoned in developed countries. Compared with developed countries in Europe and the United States, there is still a significant gap in the domestic technological level.
In recent years, the literature and patent reports on new antifouling coatings at home and abroad are very impressive, involving Wuxi self-polishing, controllable dissolution type, biological antifouling, chemical bionics, nano slow-release, alkaline antifouling, biological enzyme antifouling, Low surface energy, conductive anti-fouling, structural bionics, fluorescent anti-fouling and other technical features of Nuoduo. In summary, it can be attributed to two series of release antifouling coatings and non-release antifouling coatings. The release type is still based on the design concept of self-polishing or dissolving antifouling paint, focusing on the research and development of biological extracts or artificially synthesized bionic antifouling agents, as well as biological enzymes and strong substances as antifouling agents, and then developing nano slow-release technologies. The controllable and effective release of various low-toxic, environmentally-friendly antifouling agents in the coating is well-realized, and the purpose of high-efficiency antifouling is achieved. Non-releasing series of antifouling paints such as low surface energy, conductive antifouling, structural bionics, fluorescent antifouling, etc. rely on the specific physical mechanism of the coating to achieve a non-toxic and long-lasting antifouling function map.
Low surface energy antifouling coatings have received more and more attention due to their non-toxic and unique antifouling mechanism. The Luoyang Ship Material Research Institute of my country has been more mature in the research of low surface energy antifouling coatings and has already provided a variety of products for ship antifouling use. However, such coatings have problems such as poor compatibility with primers and poor recoatability. At present, researches on modification of such coatings are being carried out at home and abroad in order to obtain better antifouling effects.
The capsaicin antifouling paint developed by the Second Institute of Oceanography, State Oceanic Administration of my country, is a composite of biologically active substances extracted from natural non-polluting peppers and organic clay. It will not kill attached marine organisms, but only To drive away. The coating has been tested on 7 ships in the South China Sea, the East China Sea, the Yellow Sea, and the North Pacific Ocean. The results show that the capsaicin antifouling paint has obvious antifouling effects.
my country's oceans are vast and there are many types of marine organisms attached, including lime worms, oysters, barnacles, various algae, and branch worms. If Titanium Alloy Rectangular Tube is used in seawater environments, corresponding anti-fouling measures must be adopted.
A variety of methods to prevent marine organism fouling have been studied, such as antifouling paint antifouling, electrolytic seawater antifouling, ultrasonic antifouling, biological antifouling, and low surface free energy antifouling methods. At present, the following measures can be adopted to solve the growth of marine organisms in China:
(1) The sub-exudation type coatings currently used in domestic ships can be used, and the antifouling period is 3 years.
(2) The use of electrolytic seawater for anti-fouling: that is, electrolysis of seawater produces chlorine gas, which is dissolved in water and becomes ClO-1, which is an unstable strong oxidant. As long as its concentration reaches 0.01PPm, it can ensure that sea creatures do not adhere, or Be killed. As hypochlorous acid is extremely unstable, it will soon become NaCl and return to the sea, so it will not pollute the environment.
(3) The use of electrolytic copper and aluminum electrode comprehensive anti-fouling technology: because cuprous oxide is an effective substance to inhibit biological adhesion, copper anodes can be installed on small and medium-sized ships, and Cu + ions are generated by electrolysis through small direct current. When the concentration reaches 5PPb, the adhesion of marine organisms can be prevented. The electrolytic aluminum anode biologically produces Al(OH)3 glue, which can maintain Cu + and make its effect longer. At the same time, Al(OH)3 is attached to the tube wall to prevent corrosion.
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