Slip Agent

material

A processing additive that reduces the coefficient of friction between polymer surfaces, improving material flow and preventing blocking in films and molded parts.

In Simple Terms

Slip agents are additives mixed into plastic resins to make surfaces more slippery. They help plastic films slide past each other instead of sticking together, and make it easier for molten plastic to flow through processing equipment.

Why It Matters

Slip agents are crucial for film production and packaging applications. They prevent costly web breaks during converting, reduce blocking in film rolls, and improve processing efficiency by reducing friction in molds and dies.

Technical Details

Slip agents typically consist of fatty acid amides (like erucamide or oleamide) that migrate to the polymer surface during processing. They form a thin lubricating layer with coefficients of friction typically ranging from 0.2-0.4, compared to 0.8+ for untreated surfaces. Addition rates usually range from 0.01-0.1% by weight.

Real-World Examples

LLDPE film production

Erucamide slip agent added at 500 ppm prevents film blocking and reduces COF to 0.25, enabling smooth unwinding of film rolls

PP injection molding

Slip agent in polypropylene reduces ejection force by 30%, preventing part damage and improving cycle times

Blown film processing

Slip additive masterbatch at 2% let-down ratio ensures consistent surface lubrication throughout the film web