Abstract.
Marine biofouling not only increases fuel consumption but also affects ship speed. It also accelerates the corrosion of ship hulls and causes serious economic losses. Marine biofouling also increases the risk of marine operations. In this paper, we use benzisothiazolinone controlled slow release technology to modify marine antifouling coatings. It is hoped that the problem can be better solved.
China is a large marine country. The sea area of China is about 2 million square kilometers. Among them, the sea area of the South China Sea has a tropical monsoon climate. Ships such as cruise ships, container ships, large scientific research vessels and military ships engaged in production and transportation in its waters are exposed to tropical marine environments. This situation has high requirements on the anti-fouling and anti-corrosion performance of ships.
Without corresponding technical support for anti-fouling and anti-corrosion, the service life of ship facilities will be greatly reduced. It will also increase the fuel consumption of the ship.
The British International Paint Company has conducted statistics on ship fouling and fuel consumption increase: if the bottom of the ship is fouled up to 5%, fuel consumption will increase up to 10%; if the bottom of the ship is fouled up to 50%, fuel consumption will increase up to 40%.
Therefore, the research and development of a marine anti-fouling coating for ships in the South China Sea are very important.
Firstly, the synthetic vinyl pyridine-modified acrylic resin was used as the main film-forming substance. Benzisothiazolinone was microencapsulated to provide a controlled slow-release effect. The above materials were compounded with SiO2 nanoparticles and color fillers. Low surface energy composite coatings were produced. The composition and method of microencapsulation were investigated. To achieve a better slow-release effect. To improve the low surface energy composite coatings. Final testing of synthetic marine antifouling coatings.
1. Development of Antifouling Agents.
China is a large marine country. The sea area of China is about 2 million square kilometers. Among them, the sea area of the South China Sea has a tropical monsoon climate. Ships such as cruise ships, container ships, large scientific research vessels and military ships engaged in production and transportation in its waters are exposed to tropical marine environments. This situation has high requirements on the anti-fouling and anti-corrosion performance of ships.
Without corresponding technical support for anti-fouling and anti-corrosion, the service life of ship facilities will be greatly reduced. It will also increase the fuel consumption of the ship.
The British International Paint Company has conducted statistics on ship fouling and fuel consumption increase: if the bottom of the ship is fouled up to 5%, fuel consumption will increase up to 10%; if the bottom of the ship is fouled up to 50%, fuel consumption will increase up to 40%.
Therefore, the research and development of a marine anti-fouling coating for ships in the South China Sea are very important.
Firstly, the synthetic vinyl pyridine-modified acrylic resin was used as the main film-forming substance. Benzisothiazolinone was microencapsulated to provide a controlled slow-release effect. The above materials were compounded with SiO2 nanoparticles and color fillers. Low surface energy composite coatings were produced. The composition and method of microencapsulation were investigated. To achieve a better slow-release effect. To improve the low surface energy composite coatings. Final testing of synthetic marine antifouling coatings.
2. Slow and Controlled Release Technology for Marine Antifouling Agents.
In order to extend the effectiveness of antifouling agents, domestic and foreign researchers have done a lot of research on them.
A large number of studies have been conducted. There are various methods. Microencapsulation, porous microparticles, microtubule adsorption, etc. have been used for the study of this technology.
A capsule was synthesized by G Sqernsen et al. The wall of the capsule was N-tert-butylcarbamate, which reduced the release rate and also prolonged the action of the drug by not being decomposed by UV light.
Shi Hang et al. prepared encapsulated microspheres by solvent volatilization method and achieved the slow release of an antifouling agent in.
Dong Lei prepared chitosan-coated cuprous oxide microspheres by sodium sulfite reduction method and hydrated umbilical reduction method in his Ph.D. thesis, respectively. The phenomenon of exudation burst release was significantly improved. The exudation rate was reduced, and the slow release effect was achieved.
Porous microparticles as well as microtubule adsorption technology is one of the most effective methods to control the slow release of antifoulants. The surface area of the prepared nanoparticles, after forming porous substances, is greatly increased. Then, by using graft copolymerization or capillary adsorption, the antifoulant is adsorbed within the pore. Thus, controlled slow release is achieved.
Pcrie R et al. prepared diblock acetylene soft phospholipid microtubules. They were coated with tetracycline. A slow-release effect was achieved.
Rhom and Haas studied the use of activated carbon with a high specific surface area of 30-100 μm as an adsorbent material. The adsorption of antifouling agent isothiazolinone reduces the release rate, etc.
Based on the above reasons, this paper proposes to use benzisothiazolinone with a significant antifouling effect, combined with microcapsule-coated slow-release and low surface energy coating technology. In this paper, we propose to synthesize marine antifouling coatings for ships in the South China Sea.
3. Technology Route.
The main elements of this study include.
(1) Preparation of film-forming substances. Acrylic monomer, vinyl pyridine, and organofluorine monomer dodecafluoroheptyl methacrylate (GO4) were used as raw materials. Benzoyl peroxide (BPO) was used as initiator. The vinyl pyridine modified acrylic resin was synthesized by solution polymerization under the protection of N2.
(2) Benzisothiazolinone was encapsulated by microencapsulation method.
(3) Mix SiO2 nanoparticles with solvent. Ultrasonically disperse. Add the color filler iron oxide red, kaolin, wollastonite, etc. Enter into the dispersion sand mill to disperse. Then add resin and benzisothiazolinone in conical mill to grind.
(4) Perform slow release and antimicrobial test of loaded antifoulant. Later stage of the experiment Test the antifouling effect in harbor pegboard.
4. Features of This Study.
This project proposes to use benzisothiazolinone with an obvious antifouling effect and microencapsulation coating method to achieve long-lasting and uniform release of the antifouling agent.
method to achieve the long-lasting and uniform release of the antifouling agents. The solution polymerization method is used to synthesize vinyl pyridine-modified acrylic resin, and the modification of film-forming substances will further provide the performance of composite coatings.
The composite of nano-SiO2 and color filler etc. will get low surface coating and reduce the adhesion of marine organisms. As the high-end ships in the South China Sea have high anti-fouling and anti-corrosion requirements, the current products on the market are not as effective as desired.
The composite coating that combines the antifouling effect of obvious benzoisothiazolinone, the slow release of microcapsule coating, and low surface energy coating technology can effectively solve the problem of antifouling and anti-corrosion of high-end ships in the South China Sea waters.