Film-forming mechanism of coatings

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The film-forming mechanism of coatings: The application of coatings on the surface of the object to be coated is only the first step in the formation of a coating film; the process must continue until a solid, continuous film is formed in order to complete the entire film-forming process. This process of changing from a \"wet film\" to a \"dry film\" is commonly referred to as \"drying\" or \"curing\". This drying and curing process is the core of the coating film-forming process. Coatings with different forms and compositions have their own film-forming mechanisms, which are determined by the properties of the film-forming substances used in the coatings. Generally, we classify the film-forming process of coatings into two main categories: (1) Non-transformative types, which refer to physical film formation processes, wherein the solid film is formed as the viscosity of the coating increases due to the evaporation of solvents or other dispersing agents present in it. For example: acrylic coatings, chlorinated rubber coatings, asphalt paints, vinyl coatings, etc. (2) Transformation type: This generally refers to a chemical reaction occurring during the film-forming process, with the coating forming its film primarily through such chemical reactions. This film-forming process is one in which the film-forming substances in the coating polymerize after application to form a polymer film; it can be considered a special method of polymer synthesis that follows the mechanisms of polymerization reactions entirely. For example: alkyd coatings, epoxy coatings, polyurethane coatings, phenolic coatings, etc. But. Most modern coatings do not form a film through a single mechanism, but rather rely on multiple mechanisms to achieve film formation.