ADDITIVES | MATERIALS
synergistic effect with primary and secondary antioxidants to stabilise polyolefin resins. Baerloch- er says that the RST packages create value beyond the use of typical binary antioxidant blends. The technology enables superior stabilisation of PCR used for a wide variety of packaging applications. Collaborating with HDPE plastics recycler Envision Plastics enabled the development of a new grade of PCR HDPE with improved consistency and processability, and ultimately resulted in high quality packaging applications. The new rHDPE grade was tested at Bekum America’s facility using an F-style 10-litre bottle with a handle. Results revealed the tested rHDPE 100% PCR content displayed more robust processability and enhanced final bottle specifications versus the control. Baerlocher is also enhancing PCR and post-indus- trial (PIR) resin for film through collaboration with members of the Association of Plastic Recyclers (APR), such as US recycler Revolution. Baeropol T-Blends have been used during the development phase of new higher performing PCR resins for film applications. Additionally, Baerlocher is leading projects with other companies involving the use of stabiliser technology to enable higher-volume, more-consistent and better-quality PIR and PCR resin supply versus conventional antioxidants. One of these projects, with a major UK post-consumer plastics packaging recycler and flexible packaging solutions provider, has resulted in new commercial product development that has led to the company exceeding the UK’s new law in which packaging not containing 30% PCR receives a penalty. According to BYK, ecological and economic
interests, regulatory demands from politicians, and public opinion are creating an increased interest across all industries to recycle plastics and to increase sustainability in all areas. “However, recycling for high-value applications is often not possible or only possible to a limited extent,” says Jörg Garlinsky, Head of Global End Use Thermo- plastics – Industrial Applications. “Contaminants,
Impact strength of recyclate contaminated with paint (ageing at 135˚C)
Figure 1: Baeropol T-1111
stabilizes the melt index of PCR to improve processability
Source: Baerlocher: Figure 2:
Crush test for PCR bottle with Baeropol T-1111
outperformed the PCR control
Source: Baerlocher:
fillers used in previous applications, expended stabilisers, odours and lack of performance limit the areas of use to the lowest price range for applications with inferior quality. BYK’s product range Recyclobyk has been specifically developed to restabilise plastics during reprocessing and for their subsequent new applications, improving the mechanical properties.” BYK adds that its products can neutralise the
negative effect of impurities and increase impact strength. Just 0.2% paint residue in recyclate causes a significant drop in impact strength during ageing. After around 1,500 hours, an impact strength of approximately 15% of the original value can be measured. Recylobyk 4373 compati- bilises the paint impurities and restabilises the material so that after 1,500 hours, 90% of the
Source: BYK
www.plasticsrecyclingworld.com March/April 2023 | PLASTICS RECYCLING WORLD 27
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