plasticisers | PVC
retardant than DINP but, because formulations do not need as much of the Perstorp product, there is a marked difference in the fi re properties of the PVC/ plasticiser combination.
“Particularly impressive are the gelation character- istics,” Perstorp claims. “Because it gels faster at any given temperature compared to other plasticisers, Pevalen enables production speeds to be increased and/ or energy consumption to be reduced.” Processors can also benefi t from its low viscosity and low volatility, the company says.
Fogging profi le of common plasticisers. C10 (DPHP) has a signifi cantly lower fogging profi le
“The results on fi re properties are only preliminary, and we need to deepen our investigations before we make any categorical claims,” says David Bray, Plasticisers Product Manager at Perstorp. “But we are optimistic that further research will confi rm what we have already seen.
Fire performance
Grupa Azoty has also reported on positive effects on fi re performance with its Oxovifl ex DEHT plasticiser. Application Laboratory Manager Ryszard Grzybek and Strategic Marketing Manager Maciej Budner spoke about the potential for synergies between Oxovifl ex and mineral additives in both rigid and fl exible PVC at AMI’s PVC Formulation 2016 conference in Cologne in April (where Perstorp’s Magnusson also spoke). They said tests indicated improvements in fl ame resistance (both in terms of fl ame-out and total smoke release) and thermal properties.
Graph showing the amount of smoke given off by different fl exible PVC formulations in the Cone Calorimeter. Formulations containing 50phr of Pevalen give off much less smoke than formulations containing the same amount of DINP. The difference is even more signifi cant when formulations of the same softness are compared (Pevalen 46phr). Source: Perstorp
purpose polyol ester plasticiser, Pevalen, for close-to- consumer applications. The company says new advantages are now emerging for this product. Researchers recently studied various formulations using Pevalen and DINP and, when they compared formulations with the same hardness, they found that formulations based on Pevalen had superior perfor- mance in terms of smoke release. They also found that the limiting oxygen index (LOI)
of formulations containing Pevalen and a number of different types of fl ame retardant, most notably antimony oxide, were better than formulations contain- ing DINP (which it speculates may be due to synergies between the plasticiser and the fl ame retardant). Pevalen does not appear to be inherently more fl ame
34 COMPOUNDING WORLD | August 2016
Santicizer phosphate ester non-halogenated plasticisers from Valtris also bring good fl ame resistance combined with smoke suppression and high plasticiser effi ciency. “They are of particular use in applications where the use of fl ame retarding fi llers such as antimony oxide has to be reduced or avoided,” Karl Billast notes.
Hallstar says it continues to expand its current
product line of specialty esters. Dejan Andjelkovic, Technical Director of Polymer Additives, says there is an ongoing need for new product development. “Markets for these esters are mature but our customers are pushing to maximise performance to meet the ever- increasing demands,” he says, highlighting increasingly stringent performance requirements for low -fogging esters for auto interiors. “The Fog Value from years ago was 75-85 and now 95 has become the new minimum,” he notes. “Non-migration to polyurethane foam is an absolute need. Also low-temperature properties continue to need improvement with -30°C or better required by most of the automotive companies.” To address these higher performance requirements, Hallstar has developed Paraplex A-8862, a polymeric
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