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The main function of PVC processing aids is to optimize melt flowability, promote plasticization uniformity, and reduce melt defects.

The specific functions include:

Promote plasticization: reduce the viscosity of PVC melt and shorten plasticization time (such as ACR additives accelerating plasticization through molecular chain entanglement).

Eliminating melt fracture: reducing the phenomenon of melt fracture at high shear rates (such as extrusion or rolling) and improving surface smoothness.

Improving thermal stability: Some additives (such as acrylic esters) can delay the decomposition of PVC and work synergistically with heat stabilizers.