Toughness testing of copper enameled wire is also a very important work. What factors will affect the toughness of copper enameled wire, let's learn about it together.
The elongation of the paint film itself is very small, and it has adhesive force when applied to the wire, which is caused by the mutual diffusion of molecules between the paint and the metal. Copper enameled wire is a polar polymer with good compatibility with conductors, which is conducive to molecular diffusion and good adhesion.
If the surface of the conductor is contaminated with nonpolar substances or dirt, the adhesion of the paint film will be reduced, and the flexibility of the polymer chain is related to the composition of its main chain. The carbon atoms of the two single-chain combinations can freely rotate around their central axes. Increasing the crosslinking degree of the polymer can increase the rigidity of polymer, but reduce the flexibility. When the molecular chains are crosslinked, they are united into a whole, which restricts the movement of the molecular chain segments between the cross-linking points. Excessive cross-linking makes the material lose flexibility and increase brittleness.
For certain paint, the change of the elasticity of the paint film is mainly due to the crosslinking of lacquer-based resin. If the copper enameled wire is not baked sufficiently, the lacquer-based resin does not reach a certain crosslinking degree and does not form an appropriate body structure, then the elasticity and adhesion of the paint film are poor. If baking is excessive and crosslinking is too high, the elasticity will also decrease, and the surface particles of the paint film will lead to stress concentration during winding, which will also affect the elasticity of the paint film.