How to distinguish between PVC internal lubrication, external lubrication and internal and external
How to distinguish between PVC internal lubrication,
external lubrication and internal and external lubricants?
generally divided into internal lubricants, external lubricants and internal
and external lubricants according to their specific role. External lubricant is
mainly to reduce the polymer melt and screw, barrel and body bond strength
between the lower friction between them; and internal lubricant is to reduce
the friction between polymer molecules, increasing the polymer Processing
fluidity and uniformity. The key to distinguish between internal and external
lubricants is the compatibility of the lubricant with the polymer, the external
lubricant compatibility is small.
actual role of lubricants, unlike the definition of such a clear distinction,
and under certain conditions, the role of internal and external lubrication
will change, such as calcium stearate, its lubricating effect is more complex,
there is no other formula lubricant Or internal lubrication ratio is relatively
low, it only play the role of internal lubrication, lubricating oil ratio in
the other cases, it will show the role of external lubrication. And, it works
synergistically with many lubricants.