Coatings only need to be coated and dry to form a film in order to achieve their intended use. The dryness of wet coating film, also known as curing. The liquid coating forms a "wet coating film" on the coated object, which requires a certain period of drying or curing process to form the required solid continuous coating film. Dry coating is one of the three main contents of coating construction. Wet coating only requires an accurate drying process to achieve the desired coating and complete all operational requirements of coating construction. The dryness of coating not only affects the function of coating construction, but also has a significant impact on the power consumption of coating construction, as it often consumes a long time.
The method of dry coating is mainly determined by the film-forming mechanism of the coating. Coatings composed of different shapes have their own film-forming mechanisms, which are determined by the types and properties of film-forming substances in the coating composition. According to the properties of film-forming substances, coatings can be divided into two categories: conversion coatings and non conversion coatings. The commonly seen two-component coatings are conversion coatings, while single component coatings are mostly right or wrong conversion coatings. However, there are also a small number of single component coatings that are conversion coatings, such as alkyd coatings and oil based coatings. Therefore, the wet coating film applied on the surface of the coated object is also divided into two categories: liquid non conversion coating film and conversion coating film.
The drying methods for non conversion coatings generally include evaporation drying and coagulation drying, which are generally single component coatings. Evaporation drying relies on the solvent or dispersing medium in the coating to evaporate at room temperature and become a solid coating. Agglomeration and dryness are mainly caused by latex paint. When the moisture in it evaporates, polymer particles aggregate with each other to form a film.
Conversion coatings can be divided into two categories based on their composition: one is solvent-free grease coatings and resin coatings that do not contain evaporative solvents; Another type is coatings containing evaporative solvents or dispersants. They dry and form films through chemical reactions, commonly known as chemical dryness. For the latter type, also known as physicochemical mixed dryness, according to the film-forming principle of existing coating types, it can be divided into three methods: oxidative polymerization, initiator induced polymerization, and hydrogen transport polymerization.


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