How to soften PVC recycled pellets?
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The raw material is defective product from the PVC virgin material testing (already in granular form), with a hardness of 60P. Soft PVC recycled pellets are produced using substandard new material, black filler, and a plasticizer (DINP), with a target hardness of 85P. It was found that DINP is not absorbed (perhaps only a small amount is absorbed) and flows out from the screw. The hardness of the regenerated particles remains relatively constant, at around 70P. What can be done to ensure that DINP is completely absorbed, thereby increasing the hardness to 85P? Are additional additives needed? Or is it not possible to make them any softer? Thank you!
Just add a little filler, and the particles will become harder.
I need it to soften, not to harden
Increase the amount of plasticizer used and appropriately extend the plasticization time
I have added enough plasticizer; the mixing temperature is 110, and mixing takes more than 10 minutes. The material becomes clumped, and when it is extruded, the plasticizer flows out through the outlet and is not absorbed by the material.