①The main film-forming substance of electrolic tin plate coating. It is a basic substance that makes electrolic tin plate paint adhere to the surface of an object and form a film layer, also known as a fixing agent or an adhesive. It can form a film with strong adhesion alone, or it can form a film with a secondary film-forming substance, which plays a decisive role in the properties of electrolytic tinplate sheets coatings and films.
②Second film-forming substance of tin plate sheet electrolytic coating. It can't be formed separately from the main film-forming substance. The secondary film-forming substance in the printing tin plate sheet electrolytic coating is pigment, which is mainly divided into color pigment, rust-proof pigment and physical pigment.
(A) Colored pigments of tin plate sheet electrolytic coating. In printing tinplate coatings, colored pigments are mainly used for covering and decoration, and are the most common type of pigments. The main coloring pigment used in printing electrolic tin plate coatings is titanium dioxide, which is titanium dioxide.
(B) Anti-rust pigment of electrolic tin plate coating. Its main function is to prevent metal substrates from being corroded. It is divided into physical antirust pigments and chemical antirust pigments. The former can increase the density of the film layer and isolate the metal surface from water, air, etc. Once the film layer is broken, the rust prevention fails. The latter mainly depends on the chemical passivation of the metal surface by the pigment to prevent rust. Even if the film is damaged by a small amount, it still has a certain ability to prevent rust.
(C) extender pigment of electrolic tin plate coating. Also known as filler, it is generally a white powder. It has almost no coloring and covering ability to the film layer, but has good chemical resistance, abrasion resistance, and low price. It can be mixed with colored pigments to increase the thickness of the film layer and improve its mechanical properties.
③ auxiliary film-forming substance of electrolytic tinplate sheets coating. This substance cannot form a film layer, it can only help to form a film layer and improve the performance of the film layer. The auxiliary film-forming substances include solvents and auxiliary agents with certain functions. Solvents in electrolytic tinplate sheets coatings include organic solvents, water, auxiliaries and diluents, which are necessary for the preparation of liquid coatings; the role of the additives is to improve the performance of a particular aspect of printed iron coatings, usually in small amounts, but with significant effects. Commonly used auxiliaries are plasticizer, matting agent, antistatic agent, drier, curing agent, leveling agent, anti-sagging agent, etc.
