Meaning
Chemical breakdown of fatty acid amide slip agents occurs when polymer compounds are exposed to elevated temperatures during melt processing. When compounding thin film resins, erucamide thermal degradation causes the loss of surface-lubricating properties due to the molecular alteration of the slip additive. The resulting byproducts often create discoloration and odors in the final product, which compromises the quality of food-grade packaging films and increases the scrap rate during manufacturing runs.
Molding Impact
High processing temperatures in the extruder barrel trigger the oxidation of the amide molecules. The degraded additive fails to migrate to the film surface, which increases the coefficient of friction of the molded film. This failure leads to roll blocking and prevents high-speed packaging lines from feeding the material smoothly.
Additive Migration
Degradation products can alter the optical properties of clear packaging films. Yellowing of the resin occurs when the unsaturated carbon chain of the slip agent breaks down into conjugated ketones. These chemical changes degrade the visual appeal of the molded components and reduce the value of the scrap material.
Temperature Threshold
Processing polymers below critical thermal limits preserves the functionality of slip additives. Maintaining lower melt temperatures prevents oxidative breakdown while securing the desired coefficient of friction. This careful thermal management ensures that the film retains its slip characteristics without requiring excessive dosage of virgin additives.
