PLASTICISERS | PVC
Plasticiser producers take a bio approach
Many of the latest developments in PVC plasticisers are focused on bio-based solutions that meet or exceed current performance and migration expectations, writes Peter Mapleston
One of the key areas of development in plasticisers for PVC is sustainability, with many of the latest introductions produced either in full or in part from renewable feedstocks. Given how much of a flexible PVC compound is accounted for by the plasticiser, renewable and bio-based options can provide a highly effective means of enhancing sustainability of items manufactured using this important and versatile polymer. Two new 100% bio-based polymeric (polyester) plasticisers —Edenol 2178 and 2192 — have been introduced recently by Emery Oleochemicals. The difference between the two is mainly in their molecular weight, which manifests itself as viscos- ity. Each can be used on its own, or in combination with the other, or with another different plasticiser. Both are made from building blocks that comply with indirect food contact regulations for plastics and food-contact approvals for the plasticisers themselves are pending. Emery says the polymeric nature of the new
grades means they exhibit reduced migration when compared to lower molecular weight types. Test carried out by the company comparing Shore
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D hardness and extraction resistance in isooctane (Figure 1) for the new Endemol grades and a di(2-ethyl hexyl) adipate — DEHA/DOA — showed a notable reduction in plasticiser migration. “The crucial finding of this analysis is that by
replacing the DEHA monomeric plasticiser with one of the polymeric plasticisers, the extraction resistance can be clearly improved while rarely compromising Shore hardness,” says Christian Müller, Global Head of Business Development and Marketing at the company. “Replacing DOA by a 2:1 blend of DOA with Edenol 2178 or Edenol 2192 does not alter the tensile strength and modulus too much. However, it results in an approximately 35% reduction in mass loss.” In addition to PVC formulations, Edenol 2178 and 2192 can also be used to increase flexibility in bioplastics, most notably PLA. Elatur DINCD is one of the newest plasticisers
from Evonik Performance Intermediates. An isononanol-based cyclohexanoate, it is said to provide very good low-temperature flexibility, high UV resistance, and low volatility. The com- pany says that Elatur DINCD is also easy to
August 2022 | COMPOUNDING WORLD 15
Main image: Rape seed is one of a number of bio-based sources being explored for production of more sustain- able PVC plasticisers
IMAGE: SHUTTERSTOCK
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