Defects caused by paint decoration five factors

At present, along with our country coating types and methods of development and change, the coating defects emerge in endlessly, it is difficult to find out why. So far, there are still many defects do not know why they can form. Even more wonderful, some defects can occur naturally, but after a period of time will automatically disappear. The following fees may cause the influence factors of coating defects, but defect is often caused by the interaction between various factors. ( 1) Paint coating elements by film-forming material, solvents, additives, coloring material components and a variety of materials such as composition, its performance is composed of various components, can realize the function of the length of the complementary. In general, the preparation of the coating in the metastable state, vulnerable to defects caused by various external conditions, such as improper storage environment has led to an increased viscosity or curing, long storage time, the coating due to the quasi steady state tend to be the inevitable result of the unstable state. Another example is the coating formula design is unreasonable, improper raw materials selection, problems in the process of manufacturing, inspection, shipping, packing, transportation, etc. Special coating is according to the coating manufacturer's product specifications and stop process, but there are still defects. At this point, you can find the reason from the coating. ( 2) Base material properties affect the timber and wood is unique coating base material, water content, porosity, inhomogeneous materials and wood properties, as well as more elements constitute a defect. There are many defects ( Bug, crack, crude oil, grease, etc. ) 。 ) Without etching solid wood base material itself, it will form a coating defect directly. High water content and water of pass in and out of the wood not only in the formation of various sorts of defects before and after coating, and the wood coating paint film after the main cause of cracking and damage. Wood coatings, therefore, must first fully understand the wood, and then do the quality management of wood coatings, in order to reduce the possibility of many defects. Therefore, when coating defects occur, basal elements can not be ignored. ( 3) Coating process elements when the elements of the coating material and substrate can control and remove the defects is mainly due to the coating process design is not reasonable and the application is not strict. This coating process includes detailed coating process, methods and tools for each process, especially for repeat procedures such as drill grinding process is reasonable, the technological conditions and parameters of each process is normal. Coloring and fill holes, for example, data selection, primers and paint match, with mixed proportion of paint, thinner, the type and appropriate dilution rate, tools and equipment for equality, spray gun nozzle and air pressure, the function of oil-water separator is normal, etc. Especially the coating curing conditions ( Temperature, humidity, ventilation, dust removal, drilling time and phase, etc. ) 。 ) 。 ( 4) Coating environmental elements wood coatings, especially high-grade wood coatings, is a kind of sophisticated technology, need a good environment. Workshop, for example, the lack of lighting will inevitably affect the accuracy of the vision, which may lead to inaccurate color changes and uneven thickness control. Defects ( Such as color, drooping, unequal thickness. ) Can be detected by visual and time but can be time to stop things have not been found in a timely manner. Poor sanitation especially spraying and drilling site, the air dust purification, ceiling, wall, floor and still have dirt on clothes. It also includes wood processing of sawdust, base material grinding of abrasive dust, coating workshop environment since the formation of sources, especially with high lipid air pollution in the air, the air through the air and landed on the coating. ( 5) Spray painting technology elements work conducted by the operator. Painting process designed by the technical staff and management. Engineers and technicians quality is poor. No paint, wood and painting process of the basic theory of knowledge, no certain theoretical experience, or work, it's hard to control the normal stop and prevent the defects of paintings. All the above factors are subject to the strict control of man-made factors, so the effect of coating process is also the key factor.