ADDITIVES | PROCESSING AIDS
stability, he reports. The NC203C additive also increases the strength and tensile properties of foamed or unfoamed extruded parts.
Above: Palmowax EBS beads offer a high melting point for broad plastics applications
intended for use by rPET producers and manufactur- ers of preforms for injection stretch blow moulding. It is claimed to improve rPET processing and product quality. The company says the additive also enhances thermal stability and reduces yellowing, providing a more effective alternative to the addition of toners or colorants to mask yellowing caused by heat exposure. Avient suggests that a wider uptake of the additive in the rPET chain would eventually improve overall quality of the recycle stream. After PET, HDPE is the second most widely
sorted PCR (post-consumer recyclate) stream in most material recycling facilities (MRFs). Some of the primary challenges with recycling HDPE are retaining its physical and rheological properties, says Paul Albee, Consultant for Addisperse (AFI Global). It now offers NC203C stabiliser, which is based on reactive chemistry, to rebuild molecular weight and boost physical properties in repro- cessed and recycled HDPE compounds. The additive also improves process stability
during extrusion and increases “melt uniformity and hot strength, dramatically improving foaming,” says Albee. For example, the addition of 2% NC203C to a PCR HDPE milk bottle resin allows foam density to be reduced from 0.89 to 0.61 gm/ cm3
Cable gains Viscospeed has been developed by Innospec Leuna as a halogen-free, low-dosage, organic processing aid to minimise the negative impact on processing of increased filler loadings in halogen free flame retardant (HFFR) cable compounds without negatively affecting flame retardance. HFFR polyolefin compounds typically have a high loading of inorganic flame retardants such as aluminium hydroxide (ATH) and magnesium hydroxide (MDH). “Viscospeed has been shown to improve the dispersion of ATH and MDH, as well as carbonates and silica-based nano-materials, across many different cable compounds, demonstrating improved flow during processing and manufactur- ing,” according to Innospec Leuna. The polar additive enables fast wetting and dispersion of inorganic filler particles in the polymeric matrix. In addition, it prevents fine filler particles re-agglomerating during processing, which the company says ensures the filler makes the maximum contribution to flame retardancy. This is said to be especially useful where milled natural fillers are deployed, such as milled MDH, and where inorganic synergistic additives such as nano silica, sepiolite and nanoclays are used. The interaction between the polar filler and the
Viscospeed additive also results in optimised dispersion and char formation and reduces dripping tendency, says the supplier. Addition of Viscospeed to highly flame retardant
while reducing cell size and improving process
sheathing compounds has been shown to signifi- cantly improve processability without negative effect on elongation at break, ageing behaviour or flame retardancy. In an EVA-based cable sheathing compound, for example, despite a reduction in the
GreenMantra Technologies enters Europe
Canadian company GreenMantra Technologies, which uses its own recy- cling technology to create speciality polymers and synthetic waxes from discarded plastics, has partnered with Harke Group to distribute its products in Europe. “GreenMantra is entering the
European market soon after the EU adopted a new Circular Economy Action Plan, one of the main compo-
64 COMPOUNDING WORLD | April 2021
nents of the European Green Deal, which targets the entire lifecycle of products to ensure that sustainable products become the norm in the EU,” says Greenmantra. “A key tenet of the plan is for
producers to incorporate as much recycled material as possible, replac- ing prime material while reducing or eliminating single-use plastics. This EU mandate for a circular economy
strongly aligns with GreenMantra’s mission to upcycle discarded plastics into higher value polymers that improve performance,” the company adds. GreenMantra’s products are used as performance enhancers and process- ing aids and can be used in a range of plastics applications. �
www.greenmantra.com �
www.harke.com
www.compoundingworld.com
IMAGE: KLK OLEO
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