Rowa : New additives improve mechanical prope...
Rowa

New additives improve mechanical properties

The MVR for virgin PET, PET which has been extruded 4 times and PET which has been extruded 4 times + 5% Roealid PET-A103A SP (Source: Rowa)
The MVR for virgin PET, PET which has been extruded 4 times and PET which has been extruded 4 times + 5% Roealid PET-A103A SP (Source: Rowa)

High quality in polymers is crucial in order to increase their recycling rate. The Rowa Masterbatch laboratories are working on finding solutions for how plastics can be optimized in order to make meaningful recycling possible. The use of recycled plastics has so far been limited by the compromised mechanical properties and processability as a result of polymer degradation.  
A new development from Rowa Masterbatch GmbH, Pinneberg/Germany, for polyethylene terephthalate (PET) now demonstrates how degradation or breakdown of the polymer chain can be counteracted.
The active substance in this masterbatch is a so-called chain extender. It reacts with the ends of the polycondensate chains. The polymer chains of the degraded polymer, with a low molecular weight, are combined with one another and form longer-chain polymers.
Studies have shown that the melt flow index (melt volume-flow rate, MVR) of degraded PET can be restored with a dose of 5% of Rowalid PET-A103A SP (see graphic). The impact strength of PET which is extruded multiple times could also be almost doubled. The transparency of the PET is maintained here. This means that even high proportions of re-granulate can be mixed with new PET without significantly worsening the physical properties.

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