Paint knowledge: painting skills of ship bottom paint

Key tip: the painting skill of ship bottom paint the ship bottom paint is a kind of paint which is applied under the light load water line of the ship and submerged under the water for a long time The ship bottom paint is composed of two kinds of paint with different properties: 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 acts on the middle layer, which can prevent the corrosion of steel plate and the corrosion of steel plate by inorganic toxic materials in the anti fouling paint; ship bottom anti fouling paint is to prevent the ship from being attached by marine microorganisms, and keep the ship bottom smooth and clean in a certain period of time, so as to improve the speed and save fuel Since the bottom of the ship cannot be maintained during navigation, it is necessary to Paint knowledge | precautions for wall paint color selection Recommended introduction: when painting the wall, the owner sometimes has difficulty in choosing what color of the wall paint to paint In fact, there is no ugly color in the wall paint, only the disharmonious color matching The use of wall color contains the knowledge of health Too strong color will stimulate people's perception, make people have a sense of fidgety, affect people's mental health Grasp the basic principles of wall color and paint a colorful space 1、 Wall paint color selection notice 1 Light color is generally used for the top surface Light colors make people feel light, dark colors make people feel heavy Usually, the treatment of rooms is from top to bottom, from shallow to deep For example, the ceiling and walls of rooms are white and Paint Home News: the painting skills of ship bottom paint the ship bottom paint is a kind of paint which is applied under the light water line of the ship and submerged under the water for a long time The ship bottom paint is composed of two kinds of paint with different properties: 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 acts on the middle layer, which can prevent the corrosion of steel plate and the corrosion of steel plate by inorganic toxic materials in the anti fouling paint; ship bottom anti fouling paint is to prevent the ship from being attached by marine microorganisms, and keep the ship bottom smooth and clean in a certain period of time, so as to improve the speed and save fuel Since the ship bottom cannot be maintained and repaired during the voyage, it can only be repaired when the ship is in dock or in row Therefore, it is required to extend the service life of the ship bottom coating as much as possible within the scope permitted by the economic and technical indicators, so as to improve the economic benefits and reduce the cost of maintenance and repair Now, countries widely use the long-term anti rust paint for the ship bottom, with the service life of more than 5 years, some of which are very long Up to 10 years; at the same time, self polishing antifouling paint is used for ship bottom, and the period of antifouling paint 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 When the ship is regularly maintained, only the residual antifouling paint and a small amount of marine organisms are washed away with high-pressure water When the antirust paint is still in good condition, as long as the antifouling paint is repainted, the maintenance cost and cycle can be greatly reduced Ship bottom paint can be applied by high pressure airless spraying, hand brushing, roller coating and other anti-corrosion construction For high solid antirust primer, high-pressure airless spraying can achieve a higher film thickness at one time, and for the weld, rivet and other corner parts, one brush should be finished 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 The antifouling paint on the bottom of the ship is generally single component, but due to the high density of the toxic material of the antifouling paint, precipitation often occurs Suitable anti settling agent can be added to the coating formula, such as organobentonite, hard aluminum acid, etc Before construction, the paint shall be thoroughly mixed evenly Rosin and cuprous oxide will react to form copper rosinate Therefore, the storage life of the coating should not exceed one year Antifouling paint shall be well matched with antirust primer For example, contact antifouling paint shall be matched with primer with strong antirust property, such as epoxy asphalt matching system Pay attention to the coating interval, generally 24 hours, the shortest can be 14 hours, and the longest can not exceed 10 days 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 avoid affecting the antifouling effect 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 In the coating of aluminum hull ships, the type of antifouling paint based on acrylic resin without cuprous oxide poison is often used Do not use antifouling paint with copper mercury compound as toxic material, these non-ferrous metals will have serious corrosiveness to aluminum alloy Generally, the antifouling paint containing cuprous oxide is used for wooden ships, which is based on rosin, copper soap and coal tar pitch Copper compounds are effective poisons against maggots In the initial stage of marine biological attachment, the cleaning effect of underwater scraper is better, and the service life of antifouling paint can be prolonged Generally, the ship will be cleaned once every 3-6 months 1-1.5 years after launching, and the speed can be restored For antifouling paint containing asphalt, too long time of exposure and alternation of dry and wet may cause cracks and reticulation on the coating In order to achieve the best antifouling effect, it should be watered within 40 days after the antifouling paint is applied (if the time is long, it should be watered properly for maintenance), and it is better to water 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,