Coating knowledge: five factors influencing coating decoration defects

Core tip: with the development and change of coating varieties and coating methods in China, there are many coating defects and it is difficult to find out the causes Up to now, there are still many defects that are caused by unknown reasons More subtly, although some defects will occur, they will disappear automatically after a period of time The following expenditure may lead to the influencing factors of coating defects, but the defects are often caused by the interaction of many factors (1) As mentioned above, coatings are composed of film-forming substances, solvents, auxiliaries, coloring materials and other components and raw materials Their performance is composed of various components to achieve complementary effect through Application scope and advantages of roller ceramic coating Recommended introduction: the surface of ceramic rubber plate used for roller ceramic coating is cast into durable rubber plate by hundreds of independent small ceramic pieces Each ceramic piece has raised characteristics Under general conveyor belt pressure, thousands of unique cast bumps can produce positive traction, prevent slipping and extend the service life of conveyor belt roller At the same time, the bottom layer adopts high-quality rubber, which has strong elasticity and can play a good impact resistance role The scope of application of roller ceramic coating is one three six 83857180 (the same as V) 1 Roller coating in extremely harsh working environment 2 The belt joint is not suitable for fixing with iron buckle; 3 It is suitable for leather Home of coatings news: with the development and change of coating varieties and coating methods, there are many coating defects and it is difficult to find out the causes So far, many defects are caused by unknown reasons What's more subtle is that although some defects will occur, they will disappear automatically after a period of time The following expenditure may lead to the influencing factors of coating defects, but the defects are often caused by the interaction of many factors (1) as mentioned above, coating itself is composed of film-forming substances, solvents, additives, coloring materials and other components and a variety of raw materials, and its performance is composed of various components, so as to achieve the role of complementary length Generally, the prepared coating is in quasi stable state, so it is easy to be affected by various external conditions and produce defects, such as viscosity rise or solidification due to improper storage environment and long storage time, which is the inevitable result of the tendency of the coating self quasi stable state to unstable state For example, the paint formula design is unreasonable, the raw material selection is improper, the manufacturing process has problems, as well as inspection, shipment, packaging, transportation and other aspects In particular, the coating is carried out according to the process specified in the coating manufacturer's product manual, and defects still occur At this time, the reasons can be found out from the aspect of coating (2) as mentioned above, wood and wood materials are unique coating substrates, with water content (water is easy to move), porosity, uneven material and material properties, and more factors to form defects There are many defects (wormholes, cracks, roughness, grease, oil, etc.) in the unrepaired solid wood substrate, which will directly cause coating defects The high moisture content of wood and the continuous movement of moisture in and out not only cause various defects before and after painting, but also are the main reasons for the cracking and damage of the paint film of wood products after use Therefore, wood painting must first fully understand the wood, and then do a good job in the quality management of wood painting, in order to reduce the possibility of many defects Therefore, when coating defects occur, the factors of base material cannot be ignored (3) coating process factors when the factors of coating and substrate can be controlled and eliminated, the defects are mostly caused by unreasonable coating process design and implementation The coating process here includes the specific coating process, methods and tools and equipment used in each process, especially whether the procedures of repeated processes such as drying and grinding are reasonable, and whether the process conditions and process parameters of each process are normal and accurate For example, the selection of coloring and pore filling materials, the matching of primer and finish paint, the proportion of paint mixing, the type and dilution ratio of diluent, whether the tools and equipment are suitable, whether the spray gun nozzle and air pressure, whether the function of oil-water separator is normal, etc., especially the coating curing conditions (temperature, humidity, ventilation, dust removal, drying time and stage, etc.) (4) environmental factors of coating wood coating, especially the coating of high-grade wood products, is a fine process, which requires a good environment If the lighting in the workshop is insufficient, it will inevitably affect the accuracy of the line of sight, and may not change color, and the thickness of the coating is uneven The defects (such as color difference, sagging, thickness inequality) that could be found and avoided in time could not be found in time The temperature and humidity sprayed on the drying site could not be controlled, the ventilation of the workshop was insufficient, or the wind speed was not suitable, the solvent volatilization, solvent evaporation and paint mist were difficult to be discharged In particular, the sanitary conditions of spraying and drying sites are poor, the air dedusting and purification are not enough, and there is still dust in the ceiling, walls, floors and clothing It also includes sawdust from wood machining, abrasive from substrate grinding, pollution sources not caused by the environment around the painting workshop itself, especially air pollution with high lipid, which falls on the top of the coating after air transmission (5) technical factors of coating: the coating project is implemented by the operator, the coating process is designed and managed by the technician, the quality of the engineering technician is poor, there is no basic theoretical cultivation of coating, wood and coating process, there is no certain practical experience or work is not serious and responsible enough, so it is difficult to control the normal operation of the coating project, and it is difficult to avoid defects All the above factors can be solved by human factors, so coating technology is also a key factor 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,