Coating technology: an overview of marine paint coating

Core tip: "ship coating" refers to the process of coating to ship steel surface It not only includes embryo selection of coating before coating, pretreatment of surface to be coated, selection of coating equipment, coating process and detection of coating process, but also includes treatment of pollution in coating process, personal protection, maintenance and repair of equipment and other series of coating management work (1) When selecting materials for coating, the operation performance, coating performance and economic effect of materials are generally considered Generally, it is determined by absorbing other people's experience or testing 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 Coating home news: "ship coating" refers to the coating process applied to the steel surface of the ship It not only includes embryo selection of coating before coating, pretreatment of surface to be coated, selection of coating equipment, coating process and detection of coating process, but also includes treatment of pollution in coating process, personal protection, maintenance and repair of equipment and other series of coating management work (1) When selecting materials for coating, the operation performance, coating performance and economic effect of materials are generally considered Generally, methods such as absorbing other people's experience or determining through experiments are adopted (2) The necessary condition to obtain high quality coating is to give full play to the performance of coating materials The coating process includes the rationality and advanced nature of coating technology, advanced and reliable coating equipment and coating tools, environmental conditions of painting and the skill quality of painting staff (3) Coating management coating management is an important condition to ensure the implementation of coating process, achieve the purpose of coating and film quality Coating management includes process management, equipment management, process discipline management, site environmental management, personnel management, etc 1 In the coating process of marine paint, the quality of rust removal before the coating of the base material directly affects the protective performance of the coating Influence of various factors on coating life influence degree of factors influence degree of factors influence degree of surface treatment quality 49.5 coating type 4.9 film thickness 19.1 other factors 26.5 Surface derusting treatment not only refers to the removal of rust on the steel surface, but also includes the removal of oxide skin, old coating, grease, dust, residual welding slag and other dirt covered on the steel surface; in addition, after surface treatment, the steel also forms a certain surface roughness Therefore, the quality of surface treatment mainly refers to the cleanliness of the above dirt and the roughness of the surface after treatment The steps to evaluate the surface roughness are: first, remove the floating ash and paper scraps on the surface of the steel to be tested, then select the appropriate surface roughness comparison block according to the abrasive used for jet cleaning to form a comparison with a certain area of the surface to be tested, and then visually compare the tested surface with the four parts of the sample plate, if necessary, use a magnifying glass with a magnification of no more than 7 times to observe, to ensure Determine the part of the sample block higher and lower than the surface roughness to be measured Surface roughness classification level definition roughness parameter value ry / μ m shot angular sand abrasive (grit) the roughness of fine steel surface is smaller than that of sample block area 1 ＞ 25 ＞ 25 the roughness of fine steel surface is equal to that of sample block area 1, or between area 1 and area 2 ＜ 25 ～ 40 25 ～ 60 The roughness of the steel surface is equal to that of the sample area 2, or the roughness of the rough steel surface between area 2 and area 3 is equal to that of the sample area 3, or the roughness of the rough steel surface between area 3 and area 4 is equal to that of the sample area 3, or the roughness of the rough steel surface between area 3 and area 4 is less than that of the sample area 4 If it is difficult to make a visual inspection, the touch method can also be used to make a correct assessment of the roughness of the tested surface The method is to use the wooden contact pin on the back of the nail or between the thumb and the index finger to move alternately on the tested surface and the sample block surface, and determine the surface roughness level according to the touch 2 The coating process of ship coating is different from the production of general industrial products due to the specific process of ship building, which determines that the coating process of ship should also be adapted to the shipbuilding process, but different from the specific process of general industrial products coating Generally, the whole process of shipbuilding can be divided into the following process stages: ① steel pretreatment and shop primer; ② sectional coating; ③ shipway coating; ④ wharf coating; ⑤ dock coating; ⑥ outfitting parts coating (1) Sectional coating process sectional coating is the most important and basic part of marine coating In addition to special parts of special ships (product oil tank and cargo oil tank), all parts of the hull shall be partially or completely coated in the sectional stage There are two kinds of hull segments: plane segment and solid segment The three-dimensional sectional structure is more complex, and the surface treatment and coating work are more difficult (2) Shipway painting process shipway painting refers to the painting operation in the process from the section closing on the shipway to the ship launching The main work of painting in this stage is divided into repair and painting of large joints between sections, repair of damaged parts of coating caused by mechanical reasons or welding after section painting, and painting of parts that must be painted to a certain stage or completed before launching the ship If the construction schedule permits, some cabins with good integrity of outfitting work can be painted with integrity (3) Wharf coating process: Wharf coating refers to the coating at the stage of outfitting before the ship is launched and delivered to the wharf In addition to the painting work that must be carried out in the dock, the whole ship shall be completely painted at this stage (4) In dock coating process in dock coating is mainly to complete the coating of the area below the hull waterline, and also to do some coating work that is too late to be carried out in the outfitting stage of the wharf Since there is still a certain time before the ship is delivered, the antifouling paint at the bottom of the ship should not be finished generally Therefore, two or three coats of antifouling paint are often required when the ship is docked (5) Outfitting parts coating process there are many kinds of ship outfitting parts, some of which are large outfitting parts such as mast, hatch cover, cargo mast, and many of which are small outfitting parts such as pipe accessories, cable guide frame, handrail, handrail, etc Large outfitting parts are usually made of steel which has been pretreated and coated with shop primer, and their coating is often similar to hull coating, after secondary derusting, and then coating layer by layer; small outfitting parts are often pickled and derusted, or galvanized, or directly coated with antirust primer All ship outfitting parts shall be painted with primer before installation on board, and the finishing coat shall be painted after installation This is because it is inevitable to damage the coating due to welding or mechanical reasons during the installation process, and the topcoat and the surrounding hull structure coating at the same time will have better appearance effect 3 The painting tools of marine coatings are mainly high-pressure airless spraying, but also hand brushing and roller coating When painting the interior of the cabin, it is generally painted by hand, at the back of the frame and other places that are not easy to spray and are easy to leak, which is called precoating, and then comprehensive spraying Hand brush tools mainly include paint brush, paint roller, steel scraper, plastic scraper and rubber scraper The main equipment of high pressure airless spraying is high pressure airless spraying machine or high pressure spraying pump 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,