Coating technology: Construction Technology of anti-corrosion coating for ship bottom

Core tip: the bottom paint is composed of two kinds of paint, antirust paint and antifouling paint Ship bottom anti rust paint is the bottom coating of anti fouling paint, which is directly applied on the steel plate or used as the middle layer to prevent the corrosion of steel plate and the corrosion of inorganic toxic materials in the anti fouling paint; ship bottom anti rust paint is to prevent the ship from being attached by marine microorganisms, and to keep the ship bottom smooth and clean within a certain period of time, so as to improve the speed and save fuel 1 The service life of the bottom coating should be extended as much as possible within the scope permitted by the economic and technical indicators At present, long-term antirust paint is widely used in various countries, Application scope and advantages of roller ceramic coating Recommended introduction: the surface of ceramic rubber plate used for roller ceramic coating is cast into durable rubber plate by hundreds of independent small ceramic pieces Each ceramic piece has raised characteristics Under general conveyor belt pressure, thousands of unique cast bumps can produce positive traction, prevent slipping and extend the service life of conveyor belt roller At the same time, the bottom layer adopts high-quality rubber, which has strong elasticity and can play a good impact resistance role The scope of application of roller ceramic coating is one three six 83857180 (the same as V) 1 Roller coating in extremely harsh working environment 2 The belt joint is not suitable for fixing with iron buckle; 3 It is suitable for leather Paint Home News: ship bottom paint by ship bottom antirust paint and ship bottom antifouling paint two kinds of paint matching composition Ship bottom anti rust paint is the bottom coating of anti fouling paint, which is directly applied on the steel plate or used as the middle layer to prevent the corrosion of steel plate and the corrosion of inorganic toxic materials in the anti fouling paint; ship bottom anti rust paint is to prevent the ship from being attached by marine microorganisms, and to keep the ship bottom smooth and clean within a certain period of time, so as to improve the speed and save fuel 1 The service life of the bottom coating should be extended as much as possible within the scope permitted by the economic and technical indicators At present, the long-term anti rust paint is widely used in various countries, and the self polishing anti fouling paint is used at the same time The period of validity is generally designed to be less than 3 years In this way, with the navigation of the ship, the antifouling paint continuously releases toxic materials and dissolves During the regular maintenance of the ship, only the residual antifouling paint and a small number of marine organisms are washed away with high-pressure water, while the antirust paint is still intact, as long as the antifouling paint is repainted Developed countries have underwater scrapers, which can directly scrape off sea creatures in large ships and auxiliary ships to extend the anti fouling period The application of long-term anticorrosive primer and antifouling paint in the bottom of ship is the development trend of the bottom coating 2 The bottom paint can be applied by high pressure airless spraying, hand brushing, roller coating and other methods For high solid antirust primer, high-pressure airless spraying can achieve a higher film thickness at one time For weld, rivet and other corner parts, a layer of manual brushing is required first The secondary derusting of ship bottom steel is generally up to Sa2.5 level After removing oil and dust, the paint with uniform mixing shall be applied The coating must be applied in strict accordance with the matching design requirements, and must reach a certain dry film thickness to have a long-term anti-corrosion effect In order to improve the adhesion between antirust paint and antifouling paint, a middle layer coating is usually applied Pay attention to the drying time and the shortest and longest coating time interval of each coating 3 The antifouling paint on the bottom of ship is generally single component, but due to the high content of toxic materials in antifouling paint, precipitation often occurs A proper amount of anti settling agent can be added to the paint formula, and the paint shall be thoroughly stirred evenly before construction 4 Antifouling paint shall be well matched with antirust primer, for example, contact antifouling paint shall be matched with primer with strong antirust property Pay attention to the coating interval, 24 hours for one ship, 14 hours for the shortest and 10 days for the longest 5 Antifouling paint can be applied by high-pressure airless spraying or hand brushing, roller coating When high-pressure airless spraying is used, not only the efficiency is high, but also the film thickness is high Generally, no or less diluent is added To strictly check the film thickness of antifouling paint, a certain thickness must be achieved Anti fouling paint shall not be applied directly on exposed steel plates or inside the cabin 6 The toxicity of toxic materials is great, especially the volatility of organotin, which affects the development and survival of other non target organisms Now many developed countries have strictly restricted the content of organotin in antifouling paint Labor protection shall be strengthened during painting, and direct contact with hands is strictly prohibited; masks shall be worn when painting or removing old paint, and if headache and other discomfort are found during construction, leave the site immediately 7 The antifouling paint, which is based on acrylic acid and toxic organic tin, is often used in the coating of aluminum hull ships Generally, the antifouling paint containing cuprous oxide is used for wooden ships, which is based on rosin, copper soap and coal tar pitch 8 For large ships, bottom cleaning can be used In the early stage of marine biological attachment, the effect of underwater scraper cleaning is better, and the service life of antifouling paint can be prolonged Generally, after 1-1.5 years of launching, the ship can be cleaned in turn every 3-6 months, and the speed can be restored 9 For antifouling paint containing asphalt, too long time exposure and alternation of drying and wetting may cause cracks and reticulation in the paint film In order to achieve the best antifouling effect, the water should be discharged within 40 days after the antifouling paint is applied, and the best time is 1-2 days after the last antifouling paint is applied 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,