Slip agent masterbatch
Introduction
Polyolefin films tend to adhere to themselves (film-to-film) and metal surfaces (film-to-metal) due to their high coefficient of friction (COF). For easy processing, polyolefin films need around 0.2 COF. Slip agent masterbatches are able to modify the surface properties of a film and thus lower the friction between film layers and other surfaces. To be effective the slip needs to migrate out of the polymer to the surface and therefore it must have a degree of incompatibility with the polymer.
Product Benefits
Improve the flow characteristics of plastics during processing z Reduce the frictional resistance of end product surfaces z Enhance both appearance and function z Can be used together with other additive masterbatches such as anti-blocking, antistatic and heat stabilizer masterbatches
Slip Agents
As slip agents, fatty acid amides (Oleamide, Erucamide and Stearamide) are normally used. During processing they are solubilized in the amorphous melt, but as the polymer cools and crystallizes the fatty acid amides are squeezed out forming a lubricating layer at the polymer surface. The addition of slip agents can prevent film sticking and pulling helping to increase throughput. Z
] Types and Chemical Formula
Type Chemical Formula Melting Point °C
Oleamide CH3 (CH2 )7 – CH = CH – (CH2 )7 – CONH2 66 ~ 72
Erucamide CH3 (CH2 )7 – CH = CH – (CH2 )11 – CONH2 79 ~ 85
Stearamide CH3 (CH2 )14~16 – CONH2 98 ~ 104
