Chemically cured coatings are a type of coating whose film-forming process mainly relies on chemical reactions to form polymer coatings. The film-forming substances in this type of paint polymerize through a chemical reaction to form a strong coating during the application process. This article will introduce the film-forming mechanism, common types and basic performance characteristics of chemically cured coatings.
The film-forming mechanism of chemically cured coatings mainly includes oxidative polymerization and several other chemical reactions or polymerization processes.
Oxidative polymerization
Natural oils and paints containing oils and fats, as well as alkyd resin paints, phenolic resin paints and epoxy ester paints synthesized from oils as raw materials, all rely on oxidative polymerization to form films. During the oxidative polymerization process, the unsaturated fatty acids in the coating increase their molecular weight through oxidation, forming a polymer coating film.
Other curing mechanisms
Including moisture curing, carbon dioxide curing, high temperature trigger curing, etc. These mechanisms cure the paint by reacting with substances such as water vapor or carbon dioxide in the air, depending on the ingredients and reaction conditions.
Chemically cured coatings have the following basic performance characteristics:
The cured coating film is insoluble and has good solvent resistance.
The film-forming speed is greatly affected by temperature. Some coatings have requirements for a minimum film-forming temperature. Below this temperature, the film will not be cured.
The coating is non-thermoplastic after curing, and the coating film will not soften or deform at high temperatures.
The coating must be recoated before it is completely cured, and the surface of the cured coating must be roughened before the next coating can be applied.
In order to ensure the quality of chemically cured coatings, various inspection equipment, such as thermometers, hygrometers, paint viscometers, Thickness Gauges, etc., need to be used during the production process for quality control and testing. To sum up, chemically cured coatings form coating films through specific chemical reactions. They have the characteristics of irreversibility, solvent resistance and non-thermoplasticity, and are suitable for coating needs in various fields. During the production process, strict control of construction conditions and quality testing ensures that the coating meets expected performance and quality standards.