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                                            Application and development of electrophoretic powder coating system

                                            Hits:Updated:2018-07-13 08:07:40【Print】

                                                At present, the domestic emission control of the coating industry is becoming more stringent, and the collection of VOC tax has been raised. In this environment, the coating industry needs manufacturers to actively explore more green coating methods. Powder coatings, electrophoretic coatings and water-based coatings are widely used in more and more enterprises. This paper describes the practical application of powder coating and electrophoretic coating matching system in engineering machinery, agricultural machinery industry and the factors affecting the performance of electrophoretic powder coating system.
                                             
                                                Foreword
                                             
                                                Powder coating is a solid powder coating that is completely different from the general coating. It is in the form of a fine powder, free of solvents and water. When spraying, the powder coating is directly sprayed on the substrate which has been pretreated by a suitable method, and the surface of the coating film having excellent performance can be obtained by baking and melting. Powder coating consists of resin, pigment, filler, curing agent and auxiliary agent. It has no solvent and has obvious environmental advantages. According to different performance requirements of appearance, hardness, flexibility, chemical resistance, weather resistance, etc., it is possible to apply a powder coating of a polyester resin, an epoxy resin, an acrylic resin, a polyurethane, a fluorocarbon or the like having corresponding performance characteristics.
                                             
                                                As a water-based coating, electrophoretic coating is a safe and environmentally friendly coating in the field of coating. In the face of some complex products, such as product cavity, cracks, etc., ordinary paint is difficult to paint, electrophoresis can be well constructed, 360° no dead angle, the overall corrosion resistance of the product is significantly improved, Ultimately, the product's service life is greatly extended.
                                             
                                                The combination of powder coating and electrophoretic coating combines the advantages of the two coatings, which not only prolongs the corrosion resistance, but also increases the convenience of construction. It is the first choice for engineering machinery and agricultural machinery industry. In the actual use process, the customer has strict requirements on the corrosion resistance, aging resistance and impact resistance of the paint film; according to statistics, the annual claims caused by corrosion in the construction machinery and agricultural machinery industry will reach about 25 million US dollars.
                                             
                                                This paper combines the specific requirements of the current construction machinery and agricultural machinery market for coating paint film, and meets the potential needs of customers by changing the performance of the electrophoresis powder matching system. The types of powder coatings currently used in electrophoretic powder coating systems are primarily polyester and polyurethane systems. These two powder coatings are used on a large scale outdoors and are the preferred powder coating topcoats for the construction machinery and agricultural machinery industries. In order to achieve good results, in terms of corrosion resistance, the experiment has changed the type and type of electrophoretic paint to meet the different levels of cyclic corrosion requirements of customers. The main components of the electrophoretic paint are epoxy resin and color paste. The epoxy resin has excellent corrosion resistance and can maintain good performance under harsh environments. Due to the special working environment, the coating system used in the engineering machinery and agricultural machinery industry needs to have good outdoor durability. In addition to the corrosion resistance to meet the requirements, in the aspect of artificial aging resistance, it is also necessary to meet the customer's final product for outdoor use. Life expectancy, powder coatings are required to have good hiding power and aging resistance during outdoor exposure. This experiment achieves the best outdoor use effect by changing the choice of the type of polyester resin that has the greatest influence on the paint film and changing the curing conditions of the paint film system; mechanical properties as a very important performance index of the supporting system, get the customer's The industry's customers pay extensive attention to the improvement of the mechanical properties of high weathering coating systems. This experiment improves the impact and toughness of outdoor high weathering systems by adding a certain amount of toughening agent.
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