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The coating film formation of color coated plate mainly includes coating adhesion and coating drying.
A Color coated plate coating adhesion
The first step of the adhesion of the steel strip substrate and the coating is the wetting of the color coated plate coating on the surface of the substrate. The coating wetting can replace the air and water originally adsorbed on the surface of the steel strip substrate. At the same time, the volatilization of the solvent on the surface of the substrate has the effect of dissolution or swelling. If the solubility parameters of the film forming resin of the color coated plate coating and the surface of the substrate are properly selected, an inter-mixed layer will be formed between the surface of the color coated plate substrate and the coating film, This is very important for the good adhesion of the coating.
B Color coated plate coating drying
The adhesion construction of the color coated plate coating only completes the first step of the coating film formation in the coating process of the color coated plate, and also continues the process of turning into a solid continuous film, which can complete the whole coating film formation process. This process from “wet film” to “dry film” is usually referred to as “drying” or “curing”. This drying and curing process is the core of the coating film forming process. Different forms and compositions of coatings have their own film-forming mechanism, which is determined by the properties of film-forming substances used in the coatings. Generally, we divide the film-forming of coatings into two categories: solid and field
(1) Non-transformed. Generally, it refers to the physical film-forming method, which mainly depends on the volatilization of solvent or other dispersion media in the film, and the film viscosity gradually increases to form a solid film. For example: acrylic paint, chlorinated rubber paint, vinyl paint, etc.
(2) Transformational. Generally, it refers to the chemical reaction occurring during the film forming process, and the film forming of the coating mainly depends on the chemical reaction. This kind of film-forming is the process of the film-forming substances in the coating polymerizing the film called polymer after construction. It can be said to be a special method of polymer synthesis, which completely follows the reaction mechanism of polymer synthesis. For example: alkyd coating, epoxy coating, polyurethane coating, phenolic coating, etc. However, most modern coatings do not form films in a single way, but rely on many ways to form films. The coil coating is a typical one that relies on many ways to form films.