Plastic Pipes Conference Association # 2023 Lake Buena Vista
Jessica Hinczica, Mario Messiha, Florian Arbeiter, Gerald Pinter
In Europe, only 1.8 million tons of recycled material is processed in new products within the building and construction sector [1]. Recyclates and blends of recyclates with virgin materials are already used for different products in the plastic pipe industry, such as cable trays, or storm water management and drainage systems as well as sewage pipes [2]. Currently available recycled polypropylene (PP) fractions do not fulfill the requirement of long service life due to their low and highly inconsistent quality. However, adding only a small fraction of recycled material to virgin PP grades may lead only to a slight decay of long-term properties of pipe products [3]. Melt flow rate (MFR) is a well-established and quick method for an incoming quality control for batches. The cyclic cracked round bar (CRB) test is an excellent method to study the slow crack growth (SCG) resistance, which is a key factor regarding pipe performance [4]. Therefore, this study focuses on CRB tests, according ISO 18489, of PP recyclates as well as PP block copolymer virgin grade and their blends with a recyclate. For this purpose, two blends with a recyclate content up to 50 % were produced. Pure post-consumer recyclate depicted low SCG resistances compared to conventional virgin extrusion grades. In fact, high fluctuation in SCG resistance of PP recyclates were found. The CRB tests of the blends showed that with 25 % recyclate content the SCG resistance started to decrease leading to a drastic drop at 50 %. In conclusion, the CRB test was found to be a suitable method to rank recycled materials with regard to lifetime relevant properties. The purity of the recyclate is of high interest: the better it is, the higher the applicable content at similar SCG resistance.
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