The 21st century is a era in which mankind developed and used the oceans. Shipbuilding, shipping, offshore oil and gas development and marine aquaculture have all been greatly developed, but at the same time a variety of marine attachment organisms, such as barnacles, seaweed, shellfish and other defaced organisms attached to the bottom of the ship, buoys, docks, bridges, sea water pipes and aquaculture nets, its large number, growth speed is extremely fast, resulting in slow ship speed, fuel increase, accelerated metal corrosion, blocking pipes and net mesh, it is harmful to underwater facilities, etc. At present, in the method of preventing marine organisms from attaching to and defacing ships and various kinds of facilities, it is widely used to use anti-fouling coatings with copper compounds and other organic anti-fouling compound systems. As an organic auxiliary antifouling agent for copper-based antifouling coatings, although it has a relatively wide anti-fouling effect on marine dependent organisms, it not only has a short half-life, but also has high biotoxicity to algae, barnacles, phosphide, coilworms, moss, sea otters and diatoms, etc., but it is toxic anti-fouling agents. In order to optimize the environment, people expect to use environmentally friendly anti-fouling agents, especially those that are not biologically active, but with a high degree of anaesthetic, avoidability and anti-fouling aids that hinder attachment properties, capsaicin is one of them.
Natural capsaicin is a spicy substance found in chili peppers that is extracted early by Trsesh. Around 1910, Nelson and others conducted a series of chemical studies of the structure of chili base to determine its structure: N-shanlanin-8-methyl-6-acrylamide. The U.S. Environmental Protection Agency (EPA) believes that as a traditional food, no evidence that capsaicin is harmful to humans has been found, so it will not pollute the natural ecology and the environment. When capsaicin is used as an antifouling agent, the problem encountered is that the cost is too high and land resources are wasted. 1 t dried peppers can only extract 1 kg capsaicin, the current market price of natural capsaicin is about 40,000 yuan per kilogram. To this end, people began to obtain chili base through artificial synthesis. Through the marine static immersion test, we made a preliminary comparison between the anti-fouling effect of the anti-fouling coating containing synthetic capsaicin and the anti-fouling coating containing the machine anti-fouling aid. The rationality and feasibility of high-purity synthetic capsaicin as an organic anti-fouling aid were analyzed.
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