Лако-красочные материалы — производство

Skinning is the formation of a film on the surface of a liquid coa­ting containing oxidatively curing binder as a result of its reaction with the oxygen in the headspace in a can. It is particularly noticea­ble in partially filled cans. Skinning is an undesirable phenomenon because it results in material losses, delayed painting process due to time-consuming skin removal, and poor appearance of the film due to residual small skin particles. To prevent skin formation during production and storage in the can, anti-skinning agents are added, which are a type of inhibitor (antioxidant) that temporarily prevent or retard oxidative curing. As their effect is opposite to that of driers, they must fulfill two important requirements:

• They must retard oxidative curing in the paint container

• They must not retard oxidative curing of the coating film when applied.