Lead into the curing zone through the evaporation zone, […]
Lead into the curing zone through the evaporation zone, the main chemical reaction occurs in the curing zone is the paint-based cross-linking curing. For example, polyester paint is a linear structure of the resin through the crosslinked network structure to form a film. Curing reaction is very important, it is directly related to a number of properties of enamelled wire. If not cured enough enamelled wire flexibility, solvent resistance, scratch, softening breakdown. Although sometimes the performance is good, but the film stability is poor, after storage for some time, the performance data decline, or even unqualified.
If over-cured, the film becomes brittle, flexible, thermal shocks drop. Most of the enameled wire can judge the degree of solidification by the color of the paint film. However, since the enameled wire is made by baking many times, the appearance is not comprehensive. When the internal curing is not enough, the external curing is sufficient, the enamel wire color is good, but the peel is poor, the thermal aging test, the film casing may be or large peeling.
Curing reaction, the solvent gas density or humidity in the gas mostly affect the conjunctiva reaction, the enamelled wire film strength decreased, affecting the scratch resistance.
Variety of enameled wire different curing process requirements of the paint film is also different, the majority of enamelled wire is coated with a paint to be fully baked so that the film cured well. Polyimide wire enamelled wire is completely different, however, if each time a paint is fully baked during curing, the lacquers will be delaminated between the lacquers and will not form a solid one. The strength of the lacquer will be poor Scratch resistance failed. This is due to polyacrylamide imide film after baking fully cured into an infusible material, coupled with its poor adhesion characteristics, resulting in film delamination phenomenon, in the scratch test, the film will be a layer of a Scratch layer. Polyimide is baked so that the film is basically cured but not enough, in some molecules of the film there is still a small amount of the base end of the reaction did not react, when the paint is completely baked, and finally high temperature baking, the paint Membrane fully cured, forming a more solid overall.