Coating knowledge: introduction to five product systems of Marine Coatings

Core tip: as we all know, the severe marine corrosion environment has a very important impact on the operation life and navigation performance of ships In order to reduce the corrosion of hull materials to the greatest extent, various protection methods have been adopted from design to manufacture, such as hull coating, adding sacrificial anode or electric anticorrosion, and using hull materials with strong corrosion resistance Among them, coating anticorrosive coating is the most extensive and convenient means of protection According to the situation of ship corrosion and the different requirements of various parts for the protection performance, the development status of ship coatings has formed its own system after years of practice and application, mainly divided into antirust primer and ship coating 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: as we all know, the harsh marine corrosion environment has a very important impact on the operation life and navigation performance of ships In order to reduce the corrosion of hull materials to the greatest extent, various protection methods have been adopted from design to manufacture, such as hull coating, adding sacrificial anode or electric anticorrosion, and using hull materials with strong corrosion resistance Among them, coating anticorrosive coating is the most extensive and convenient means of protection The development status of marine coatings is based on the corrosion of ships and the different requirements of various parts for the protection performance After years of practice and application, marine coatings have formed their own system, mainly divided into antirust primer, hull top coat, fresh water tank coating, antifouling coating and special functional coating 1 Marine antirust primer marine antirust primer is traditionally divided into interior paint and exterior paint according to different areas of use In the past, chlorinated rubber system was widely used as antirust primer in shipbuilding, while asphalt primer was widely used as protection in areas with serious corrosion such as under water line and ballast tank According to the use performance, chlorinated rubber primer has the advantages of excellent coating performance, good film forming, and can be recoated, and the price is relatively low, so it has been widely used However, due to the aging and toxicity of chlorinated rubber primer, it can only be used as a low-grade coating At present, most of them are replaced by acrylic primer and epoxy primer, and only a few are used in ship repair With the development of technology, the modified epoxy coating has the trend to replace the antirust primer in an all-round way, and the pure epoxy primer with better performance is also widely used in new shipbuilders Due to the pollution of asphalt to the marine environment, from the late 1990s, the use of epoxy asphalt coating as anti-corrosion coating has been basically prohibited in the world, and the international production of asphalt coating and tar epoxy coating has been basically stopped However, due to the excellent anti-corrosion performance of asphalt, and the requirements of domestic laws and regulations are not strict, domestic manufacturers are still producing relevant products 2 The hull top coat is divided into water line paint, freeboard paint, deck paint and cabin top coat In the past, chlorinated rubber topcoat was usually used as exterior paint in traditional shipbuilding, but it was gradually replaced by acrylic topcoat due to its inherent shortage of aging However, acrylic top coat is easy to be powdered, so it is seldom used in new shipbuilding in recent years Polyurethane topcoat has many advantages, such as high hardness, good color and good light retention Now it has gradually become the leading product of hull topcoat 3 Coating cement on fresh water tank is the protection method of traditional shipbuilding fresh water tank Cement protection has almost no effect on water quality, but there are many gaps and cracks in cement, so the protection of steel corrosion is not satisfactory In modern shipbuilding, fresh water tank paint is widely used for coating of fresh water tank At present, pure epoxy coating is widely used in fresh water tanks, including high solid content and solvent-free epoxy coating The latter requires high construction equipment and technical level, and small tanks are rarely used At present, from the perspective of use, there are generally difficulties in construction and incomplete odor removal The water quality of fresh water tank can not be greatly improved It is most used as domestic water, and it is difficult to reach the drinking water standard At present, the production of high-grade fresh water tank coating is less in China, and generally it needs to be imported Not only the supply cycle is long, but also the construction conditions of high-grade coatings are harsh The requirements for environmental temperature, humidity, ventilation conditions, rust removal level and spraying equipment are high Even if the small and medium-sized shipyards use high-grade fresh water tank coatings according to the requirements of the shipowner, it is difficult to meet the performance requirements of the coatings 4 Antifouling coating in order to prevent the biological corrosion of the hull caused by the attachment of marine organisms to the hull and affect the speed of the ship, the antifouling coating is widely used in the underwater part of the hull to inhibit the development of marine organisms The traditional antifouling coating uses compounds containing arsenic, cadmium, lead and tin to kill the marine organisms, but these compounds enter the human body through the enrichment of marine organisms, which seriously endangers human health At present, it has been "banned" by the international maritime organization At present, the antifouling coatings used in ships are those using cuprous oxide as antifouling agent, which are divided into two types: long-term antifouling coatings and self polishing antifouling coatings The former must be launched as soon as possible after the completion of the construction, otherwise it will crack, and the latter will not have these restrictions From the perspective of application, the long-term antifouling coating is suitable for ships and marine facilities with low sailing rate, while the self polishing antifouling coating is suitable for ships with fast sailing speed and high sailing rate As cuprous oxide is still toxic to human body, it is only allowed to exist as a transitional product in the world, and will be gradually banned in the future The research and development of new generation antifouling coating has achieved phased results, but from the perspective of the products on the market, there are many disadvantages, such as high price, difficult construction and narrow application range, which are difficult to meet the requirements of large-scale shipbuilding 5 Special functional coatings special functional coatings emerge with the development of the ship market, including oil tank coatings, fire retardant coatings, chemical tank coatings and high temperature resistant coatings Most of these coatings are customized according to the specific conditions of the cabin and different loads At present, the commonly used special coatings are mainly produced by using epoxy resin as matrix and adding special additives (such as oil resistant pigment of oil tank) For example, aluminum powder is used as additive in general temperature resistant coating to achieve certain temperature resistant effect; for harsh environment, special coating series shall be selected, such as silicone coating used as high temperature resistant coating At present, most of the market of marine coatings is still controlled by foreign enterprises, such as international coatings, Kansai coatings, PPG coatings and other large multinational enterprises; While local enterprises only occupy a small share, such as Shanghai Kailin, Xiangjiang paint, Jiangsu Jinling and other well-known local coating enterprises The only way for local enterprises to catch up with foreign enterprises is to "practice their internal skills", increase scientific and technological research and development efforts and improve the training mechanism 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