PVC FORMULATION | ADDITIVES
Acryligard Capstock Resins from Dow offer exceptional weathering and impact resistance for use in PVC decking, railing and outdoor furniture,” says Ala.
Another key additive provider seeing a slower
Above: Recent innovations from Norac include “booster” products to alleviate tin stabiliser supply shortages
players to address misinformation about PVC and to advocate for PVC in a changing regulatory and environmental landscape.
Targeting recycling One of the main current technical areas of interest is improving the process for recycling PVC and being able to incorporate different recycle streams to achieve consistent quality. “At Dow, we are addressing this issue through the use of our innovative Surecel and Paraloid acrylic additives,” says Ala. “These additives can improve the rheol- ogy, melt strength, and processability of recycled materials, which facilitates meeting density reduc- tion targets comparable to virgin material. By aiding our customers’ incorporation of recycled materials into their products, we are not only making a contribution towards sustainability, but also reducing costs and increasing efficiency in the PVC manufacturing process.” Dow’s Surecel processing aids are said to enable
Right: Dow is seeing demand for its process- ing aids and capstocks in areas such as outdoor living
improved efficiency and high-quality cell structure at any thickness in foam applications. The company says the latest addition to the range, Surecel 488, is designed with a tailored ultra-high molecular weight to reach a high efficiency of foaming, allowing for lightweighting and improved cell structure. It, and the pre-existing Surecel 467 grade, provide density reductions in various PVC foam applications – sheet, deck, and pipe. They contribute to improved melt strength and cell structure when extruding product containing various levels of in-house scrap, post-industrial scrap generated during production in the same or external PVC applications, and post-consumer PVC recycle generated after consumer use. Demand for durable and sustainable materials in outdoor living spaces also continues to rise and Dow has a number of solutions to meet the needs of this market. “Our extensive acrylic portfolio provides excellent UV weather durability, and
18 COMPOUNDING WORLD | June 2023
market is Norac Additives. “That does not mean that things are bad, but there is a sluggishness to the market that has been absent in the previous 2-3 years,” says Stuart Parks, Technical Manager at the US-based company. “However, there are opportu- nities in this slowdown for new developments to make their way to trial and for companies to sit down and think about what their goals are long term. Contrast this to the market before, where they were only able to think about how to get their next order out of the door.” Sustainability, again, is cited a as a key trend by
Parks. “The main trends really do centre around the important issue of sustainability. Particularly in stabilisers, there is interest in how to make addi- tives with a lower carbon contribution, either through energy expenditure or with the additive ingredients themselves.” One of Norac’s latest products is Norstab 85, which was developed when tin stabilisers were in short supply and the industry needed a way to stretch availability. “To that end, Norac developed this ‘booster’ system, which allows producers to lower their tin dosage,” Parks says. “We do see synergy between calcium-zinc systems and tin stabilisers, offering better early colour and improved weathering - in QUV acceler- ated weathering testing - than tin stabilisers alone. The cost in the worst cases is offset. However, there are cost saving opportunities. That simply depends on the formulation, and what it is hoped to accom- plish. Norac is happy to assist in determining how
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IMAGE: NORAC ADDITIVES
IMAGE: SHUTTERSTOCK
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