Generally speaking, the epoxy floor paint coating system is composed of three layers of floor paint film: bottom, middle and top. Why should epoxy floor paint be constructed in three layers? Each coat has a functional definition: there are temperature and humidity differences between the primer and the top coat in the use of the thick epoxy floor coat system, and the difference of temperature and humidity will cause stress in the epoxy floor coat system. Because of the above two reasons, the "multi-layer heterogeneous" structure coating system is usually used in the coating design of epoxy floor paint. In the epoxy floor paint coating system, there is a clear division of roles among different floor paint coatings.
Primer has high adhesion and cohesion to the base material and topcoat, closes harmful substances in the base material, prevents them from seeping into the surface coating, and provides a uniform performance base for the middle coating and the surface coating. Primers usually do not pay attention to weather resistance, but pay attention to chemical resistance and solvent resistance.
Medium coating is a transition layer, which plays the role of thickening, increasing cover, forming patterns and increasing anti-permeability.
面漆承担抵抗外界腐蚀介质 (光、氧、水、有害化学物质)侵害,进一步起到美化装饰作用，面漆要求有高的耐气候性和较高的装饰性，在某些要接触腐蚀性物质的环境’需要有很高的抗化学腐蚀性。底、中、面三层相互 共同发挥作用，装饰美化和保护被涂饰物。影响一个地坪漆涂层系统可长久发挥装饰性和保护性能的 因素有：环氧地坪漆涂料的耐久性、环氧地坪漆涂层配套、施工环境、环氧地坪漆涂层系统服务的环境等，因此，将这些因素可相应归纳到环氧地坪漆涂料问题、地坪漆涂层配套问题、环氧地坪漆施工环境问题等环节。
Topcoat bears the responsibility of resisting the invasion of external corrosion media (light, oxygen, water, harmful chemicals), and further plays the role of beautification and decoration. Topcoat requires high weather resistance and decoration. In some environments where corrosive substances are exposed, it needs high chemical corrosion resistance. The bottom, middle and surface layers play a common role in decorating and beautifying and protecting the painted objects. The factors affecting the decorative and protective performance of a floor paint coating system are the durability of the floor paint, the matching of the floor paint coating, the construction environment and the service environment of the floor paint coating system. Therefore, these factors can be summed up to the problems of the floor paint coating, the matching of the floor paint coating and the floor paint. The environmental problems of the flat paint construction and other links.
The matching principle of epoxy floor paint coating system is "no interlayer and interlayer interface".
The common problems of incompatibility between flooring coatings are mainly manifested in the following three aspects: poor adhesion of coatings, cracking and peeling easily occur when there is external force acting on the flooring coatings system; and foaming and peeling easily occur when there is chemical penetration.
Infiltration is unreasonable, the unreasonable penetration of the primer coating easily leads to poor workability of the upper coating, and the coating film has pinholes, volcanoes, bubbles or "melancholes", poor leveling, loss of light and so on, which reduces the appearance quality of the floor paint film; and the color penetration is also caused by the permeability between the floor paint coatings, which is that the color of the bottom layer penetrates outward into the floor paint surface. Layer formation; impermeability mismatch. When water or other chemicals penetrate the coating system, there is aggregation of permeable media in the poor permeability coating area, resulting in bubbles falling off.
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