ADDITIVES | IMPACT MODIFIERS
IMAGE: MILLIKEN
Above: Impact performance of thin wall parts produced using rPP can be improved using Deltamax technology from Milliken
recycled PP as well as virgin materials. The com- pany is quite tight-lipped on the chemistry it uses, preferring to concentrate on its effects. Compound- ers and converters can incorporate up to 100% recycled PP without sacrificing performance or processing when they use these additives, it claims. The most recent addition, DeltaMax 5000a, is also suitable for food-contact applications. Processors using DeltaMax masterbatches are able to utilise PP in a wider range of applications and in more cost-effective ways, according to Milliken. Running high-melt-flow resins allows converters to be more productive and to create more innovative part designs with easier flow through moulds, it says, adding that DeltaMax technology reduces scrap rates and lowers energy usage in the moulding process, leading to lower carbon footprint and rapid achievement of sustain- ability goals. Other benefits include a reduced need to purchase multiple ICP (impact copolymer) resins. Broadening the application window for recycled
polypropylene (rPP) contributes to advancing the circular economy, Milliken claims. Typically rPP has a low melt flow that makes it unsuitable for many injection moulded applications. DeltaMax technol- ogy is effective in modifying post-consumer or post-industrial recycled resins and can raise melt flow by as much as five times while maintaining impact properties. This is said to enable com-
pounders and converters to incorporate up to 100% recycled PP without sacrificing performance or processing. Milliken cites the example of an industrial bucket and pail manufacturer that was attempting to formulate a high impact solution to meet specifica- tions for a three-metre drop test. It used the company’s DeltaMax i300 additive to take a conventional low/medium impact copolymer and increase the impact performance three times over while improving the failure mode to partial or non-breaks. The addition also almost doubled MFR while stiffness fell only slightly. In another case study, a company in the home
improvement products category wanted to increase the amount of recycled plastics it was using in its parts without sacrificing physical properties. “Attempts to increase usage levels of rPP have historically resulted in slower processing speeds, higher processing temperatures and material failures due to cracking,” says Milliken. By increas- ing the impact properties and melt flow rate of the recycled PP, the converter was able to make parts using 100% recovered plastic, compared to 20% previously. Impact strength improved by 20%, MFR improved 150% and, again, the reduction in stiffness was marginal, according to the company.
CLICK ON THE LINKS FOR MORE INFORMATION: �
www.dow.com �
http://eng.skglobalchemical.com �
www.sacoaei.com �
www.fineblend.com.cn �
www.tisan.com.tr/olebond �
www.hexpol.com �
www.elastron.com �
www.kraton.com �
www.milliken.com
Additional reporting by Chris Smith
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