Coating knowledge: antifouling methods for marine vessels and facilities

Core tip: with the development of science and technology and the gradual deepening of people's understanding of the ocean, the image of the ocean in front of people is not only an important channel of world traffic, but also shows rich resources and broad venues However, the marine fouling organisms attached to the bottom of the ship will increase the navigation resistance, reduce the speed of the ship, and consume more fuel, which will seriously affect the combat effectiveness; attached to the marine detector, it will cause the signal distortion and performance degradation of the instrument; attached to the aquaculture net, it will block the mesh, reduce the exchange efficiency of seawater, and sharply reduce the production of the aquaculture area; attached to the inner wall of the seawater pipeline, it will cause huge traffic accidents 。 Marine organism pollution risk Paint knowledge how about Akzo Nobel Powder Coating Recommended introduction: powder coating is a kind of coating with different form from general coating, which is in powder form It is a new type of coating, because of its own advantages and more and more known by people Let's introduce Akzo Nobel Powder coating Akzo Nobel Powder coating is a cost-effective coating solution, which can be applied to different kinds of products After the treatment of static electricity and fire baking, a tough and durable coating surface will be formed, with the least impact on the environment Since the introduction of this technology, powder coating has been able to continue to maintain the Home of coatings news: with the development of science and technology and the deepening of people's understanding of the ocean, the image of the ocean in front of people is not only an important channel of world traffic, but also shows rich resources and broad venues However, the marine fouling organisms attached to the bottom of the ship will increase the navigation resistance, reduce the speed of the ship and consume more fuel, which will seriously affect the combat effectiveness; attached to the marine detector, it will cause the signal distortion and performance degradation of the instrument; attached to the aquaculture net, it will block the mesh, reduce the exchange efficiency of seawater, and sharply reduce the production of the aquaculture area; attached to the seawater pipe The inner wall of the road will cause a huge traffic accident The prevention and control of marine biological pollution has become a comprehensive science, and has been paid more and more attention There are several kinds of marine antifouling methods: first, physical methods The physical methods include: 1 Mechanical method, regular mechanical cleaning of ships and marine facilities, including underwater mechanical cleaning and ship docking cleaning and repair 2 Ultrasonic cleaning technology converts the power ultrasonic generated by the ultrasonic generator into mechanical energy through the transducer, and then radiates it into the liquid The strong ultrasonic generates hundreds of millions of tiny bubbles in the liquid, making it difficult for the fouling organisms on the hull surface to get close to At the same time, it heats up the liquid, produces expansion and compression, and forms cavitation effect, making the surface, interior and gap of the object In order to remove the adherent organisms from the hull, the adherent of the hull of the ship dropped off rapidly 3 Radiation method, the use of materials with radiation properties will destroy and kill marine attached organisms 4 Flocking type non-toxic antifouling material covers the hull with fiber fluffy material, so that the marine attached organisms cannot approach the hull 2、 Chemical method One chemical method is to use chlorine gas to kill the marine attached organisms by passing chlorine gas through the sea water area near the protected surface Another method is to use antifouling paint coating to prevent pollution, and the antifouling paint coating on the bottom of the ship releases toxins, forming a thin layer of toxic water area under the water near the bottom of the ship, which can drive away and kill the attached biological larvae and robes, and inhibit their attachment and "settlement" of the hull surface 3、 Physicochemical method 1 The conductive antifouling coating uses the conductive polymer as the coating, which is applied on the surface of the hull and the marine buildings The conductive coating is used as the anode, and other parts of the bottom of the ship that are in contact with the sea water are used as the cathode When the small current passes through, the sea water electrolysis produces the hypochlorite ion to kill the larvae and robes of the marine attached organisms or prevent their attachment 2 The pH value of sea water suitable for survival and reproduction of marine organisms with strong acid and strong alkali series coatings is 7.5-8.5 In the environment with stronger acidity or alkalinity or alkalinity, marine organisms will be difficult to grow 3 For self polishing antifouling coating, the base material of the coating is made of hydrolyzable polymer, and the coating releases metal ions and antifouling agent through hydrolysis and ion exchange in the sea water The surface of the bottom coating adheres to biology and the hydrolyzed surface coating is separated under the scour and corrosion of the sea water, and a smooth bottom surface is formed through the hydrolysis and corrosion process, so as to prevent the surface layer Antifouling effect of passivation and attachment of marine organisms Home of coatings is specialized in coatings, diatom mud, paint coating, coating technology, fire retardant coating news and coating, diatom mud, paint coating, coating technology, fire retardant coating decoration knowledge and decoration renderings,