ALTERNATIVE TO PHTALATE PLASTICIZER FOR PVC/NBR FORMULATION USED IN AUTOMOTIVE FUEL SYSTEM WITH BIODIESEL

Paper #:
  • 2017-01-0482

Published:
  • 2017-03-28
Abstract:
Phthalates have been extensively used in rubbers formulation as plasticizer additive for PVC and NBR promoting processing parameters or reducing cost. The most commonly used plasticizer in PVC compounds was di-2-ethylhexyl phthalate (DEHP) currently not recommend due toxicity. In many studies it is described that DEHP is liable of producing toxic and adverse effects and able to act as potential carcinogenic agent. Therefore it is listed as prohibited to the Global Automotive Declarable Substance List (GADSL). Phthalates alternatives are already available but the compatibility in automotive fuel system with biodiesel was not extensively understood. This aspect is important since plasticizer may migrate and change rubber properties. Tri-2-ethylhexyl trimellitate (TOTM) and di-2-ethylhexyl terephthalate (DEHT) plasticizers have been studied the carcinogenicity and chronic toxicity potential and the migration to blood in medical devices. Those plasticizers were selected in this work as alternative additives to a rubber formulation since is not listed to GADSL and have good potential as plasticizer. The aim of this work is to compare the effect of biodiesel blend on polyvinyl chloride (PVC) and nitrile butadiene (NBR) rubber blend formulated with two plasticizers alternatives to phthalates (DEHT and TOTM). The comparison was based on mechanical properties, hardness and swell before and after aging in biodiesel per 3024h at 80°C. The results showed a better mechanical properties behavior and lower swell of DEHT formulation with lower changes in mechanical properties after 3024h. Key-words: biodiesel, mechanical properties , compatibility, rubber
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