PVC | PLASTICISERS
systems, together with permanence, flexibility, and stable surface energy characteristics. The latter is particularly important when creating multiple layer constructions or applying adhesives or printing. Emerald says that its dibenzoates play an
Figure 6: Comparison of plasticiser migration in different PVC products plasticised with DINP and Pionier TP 130 J Source: SKZ
important part in plasticisation of VCT flooring materials as some general plasticisers have limited compatibility in vinyl. Incorporation of its K-FLEX 975P, 850P or PG products into a plasticiser blend can overcome this problem while also maintaining good rheology, enhancing stain resistance and lowering the fusion temperature. For newer LVT flooring products, which are more rigid, the company says new plasticisation technologies are being developed that help optimise characteristics such as resistance to indentation, impact and heat, and improve flexural modulus and melt rheology.
Figure 7: Viscosity comparison data for base coat PVC pastes plasticised with Nexoleum’s Nexo B5 and MB50 bio-based plasticisers against conventional alternatives at same wt% (Brookfield viscometer, ASTM D 1824-95 (2010), 20rpm, 23°C Source: Nexoleum
it no longer requires labelling under EU law. Emerald says it continues to expand its portfolio
of benzoate specialties. “Our goal is not to be closed in by the relatively narrow definition of a plasticiser as a flexibiliser; instead, we are utilising the versatile benzoate chemistry to solve a broad range of challenging formulation and performance hurdles,” says a company spokesperson. Recently introduced products are said to be useful as both plasticisers and modifiers. The company says their environmentally-friendly polymeric technology platform brings together an aliphatic polyester with some benzoate functional- ity to provide excellent compatibility with vinyl
26 COMPOUNDING WORLD | August 2018
Bio-based developments More bio-based alternatives to traditional plasticis- ers are emerging. Emery Oleochemicals for example, a global natural-based specialty chemical manufacturer, provides additives through its Green Polymer Additives business unit that are particularly suitable for the food packaging industry. The company has developed a portfolio of plasticisers with what it says are exceptionally low migration characteristics. They comply with EU Directive 10/2011, which sets migration limits of substances approved for indirect food contact. To meet the demanding requirements of the food packaging industry, Emery Oleochemicals offers a full line of polymeric plasticisers over a viscosity range from 700 to 13,000 mPas (20°C); these plasticisers (in ascending order of viscosity) are Edenol 1208, Edenol 1215, Edenol 1200 and Edenol 1234. Dr Nikola Kocić from the SKZ South German Plastics Centre introduced Pionier TP 130 J at the AMI conference on PVC Formulation. This is a 100% bio-based plasticiser obtained through modifica- tion of unsaturated triglyceride with hydrogen peroxide. Its properties can be adjusted through appropriate choice of alkyl rests. Kocić called the product a “green” alternative to DINP. According to Kocić, Pionier TP 130 J scores over DINP in several ways. These include: faster incorpo- ration into the PVC matrix; higher thermal stability; lower migration and chemical extraction; and better fogging properties. Efficiency is apparently comparable with DINP in achieving required mechanical properties. Proviron is also working in the bio-based arena.
Koen Engelen, Business Manager for Proviplast products says: “Over the last decade, Proviron
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