Deck paint is the surface coating applied on the deck of a ship. Deck paint requires good adhesion, seawater resistance, exposure resistance and scrub resistance. Due to the frequent movement of people and equipment on the deck, it is required that the deck paint should also have good wear resistance and impact resistance. Deck paint can be divided into general deck paint and deck anti-skid paint according to the characteristics of use.
1. Construction skills of high-performance polyurethane anti-skid deck coatings
(1) For newly built ships pre-coated with inorganic zinc-rich primer and the deck parts that have been painted with the same kind of paint before, if the substrate is well protected, the rust can only be polished and smoothed before painting. When painting different types of coatings on repair ships, strict derusting work should be carried out, and it is required to reach st3 or sa2.5 level to achieve a good anti-corrosion effect.
(2) The construction method of the primer is similar to that of ordinary paint, and can be applied by brush, roller, airless spraying and other methods. Generally, 3 coats are applied, and the total dry film thickness is not less than 105µm. After solid drying, the next coat should be applied. The shortest interval between coats is 4 hours, and the longest coat should be painted within 24 hours.
(3) Construction of the middle layer. The middle layer is thick coating with high solid content, which is constructed by a combination of scraping and roller coating. First, according to the required coating thickness combined with the quality of each package, determine the coating area, mark the area for each package to be coated, then mix the paint, and apply it evenly on this area; then use the roller coating method to apply The surface should be as flat as possible, let it be self-leveling, and a flat surface can be obtained after curing. If the required thickness is very thick, in order to ensure leveling, an angle-changing agent can be added appropriately. Apply topcoat within 24 hours after hard drying.
(4) The construction method of the topcoat is similar to that of ordinary paint, and can be applied by brush, roller, airless spraying and other methods. After the first coat of topcoat is hard-dried (generally within 6 hours), apply the second coat of topcoat and add anti-slip granules within 24 hours, and then apply the third coat of topcoat after hard-drying.
(5) Whether the non-slip granules are evenly spread is related to the final appearance. Manually scatter while coating the topcoat, and sprinkle more appropriately. After 3 to 4 hours at room temperature, the anti-slip granules can be removed by f1, and the excess that is not adhered to the surface can be removed. If there are too few anti-slip aggregates in some places, it can be repainted and sprinkled. Apply the final top coat after 24 hours.
(6) The suitable temperature for construction is _5~35℃, and the humidity is less than 85%. When constructing below 0°C, care should be taken that the substrate does not freeze or dew. The diluent is a special diluent for polyurethane, or cyclohexidine, ABcetone. The general dosage is not more than 5%.
(7) After the last topcoat is applied, it will take 72 hours before it can be put into use; during this period, personnel are prohibited from walking, pressing, and depicting the paint film.
2. Construction skills of ordinary deck anti-skid paint
Ordinary deck anti-skid paint refers to alkyd, phenolic, and perchlorethylene-based deck anti-skid materials. The anti-skid aggregates added are generally cement and yellow sand, and are used for small boats and places where anti-skid requirements are not high.
(1) After removing oil stains and rust on the deck surface, use iron red alkyd primer or epoxy ester primer for 2 coats, and apply 2 coats of non-slip deck paint after the paint film is transparent. If the original and old paint film on the deck is of the same type as the paint to be painted, and can be well attached, and the paint film is intact, without rust and bubbles, you only need to sand the old paint film with sandpaper, remove dust, and decontaminate. Apply a non-slip finish.
(2) The coating of deck anti-skid paint, yellow sand, and cement are packaged in separate tanks, and filtered with a 20-40 mesh sieve before use to avoid sandwiching. River sand and sea sand can be used for yellow sand, but it needs to be clean and free of mud. After it is completely dry, it can be filtered through a 40-mesh sieve. The cement needs to use 450 # ~ 500 # Portland cement, and it also needs to be filtered through a 40-mesh sieve before use.
(3) The ratio of adding yellow sand and cement before using the deck anti-skid paint is generally as follows: 25 parts of anti-skid paint, 6 parts of yellow sand, and 6 parts of cement (calculated by mass), mix evenly until the sandwich is missing. Generally use a rubber scraper to scrape 1~2 layers, and the thickness is 1~2mm. Another construction method is to first filter the specified cement with a sieve and transfer it into the anti-skid paint, and then carry out roller coating or scraping paint. Dried yellow sand, and then apply a non-cemented anti-skid paint on the surface.
(4) For the anti-skid paint based on perchlorethylene and chlorinated rubber, when the viscosity is high during use, it should be diluted with a corresponding strong solvent, such as xylene, toluene, ester solvent, etc., but the amount should not exceed 10 %o
(5) If anti-slip aggregates such as corundum, plastic granules, rubber granules, etc. are used, it is generally required to use a coating with strong adhesion and high bonding strength as the anti-slip topcoat, and chlorinated rubber, epoxy, and polyurethane are commonly used.
(6) After the last topcoat is applied, it takes 72 hours before it can be put into use; during this period, personnel are prohibited from walking, pressing, and scratching the paint film.
