ADDITIVES | ANTIOXIDANTS & STABILISERS
drums, storage and industrial containers, water tanks, trash and roll-out carts, toys and the like – at reduced loading levels “The high efficiency of this 100% active product enables its users to reach similar performance as traditional HALS at half the loading required and to add other functional additives into the master- batch,” Landuzzi says. Used at similar concentration as traditional HALS, the new stabiliser will provide additional stabilisation up to 16,000 hours ASTM G155 weathering (Figure 2).
Targeting automotive Another new stabiliser, Cyasorb Cyxtra V9900 for polypropylene-based materials used in automotive interior and exterior applications, meets global UV weathering standards at lower “cost-to-stabilise,” Solvay says. The additive, introduced late last year, is claimed to deliver “next generation UV stabilisa- tion technology” in unreinforced, reinforced and elastomer-modified compounds (TPEs and TPOs). Cyasorb Cyvxtra V9000t is said to meet all worldwide automotive UV weathering specifica-
tions (Figure 3a and 3b) and surpasses key auto- motive requirements such as low VOC emission, low fogging, low odour and no interference with paint adhesion. It comes in the form of non-dusting off-white to light yellow pellets that do not agglom- erate and offers colour and gloss stabilisation. It does not migrate or bloom. Cost savings compared to other commercial UV stabilisers are said to be “significant.” Commenting on the migration behaviour of
Cyasorb Cyxtra V9900, Landuzzi emphasises the importance of adhesion between automotive paint coatings and plastics substrates. “Migrating additives can change the TPO surface wetting behaviour and negatively affect the adhesion,” he says. “Cyasorb Cyxtra V9900 has demonstrated little to no migration in TPO, resulting in excellent paint adhesion properties.” At Songwon, Thomas Schmutz, Director of
Figure 2: Performance of Cyasorb Cynergy Solutions M528 light stabiliser after ASTM G155 weathering
Figure 3a and 3b: Effect of Cyasorb Cyxtra V9900 on colour (Figure 3a) and gloss retention (Figure 3b) in a black automotive TPO compound, tested according to SAE standard J2527 for automotive exterior materials
Source: Solvay
Global Technical Services & Application Develop- ment, says that emissions from polypropylene are one of the biggest challenges faced by car manu- facturers today. “In automotive interior applications in particular, emissions depend on the purity and degradation of the polyolefin, and the solubility and inertness of the additives used,” he says. “Resin producers have introduced low-VOC products [but] these grades are more expensive than standard products and do not always meet profitability requirements.” One way to reduce VOC emissions is to slow down the pelletising step after the polymerisation of the PP, but this increases the cost of the resin, Schmutz says. Songwon’s XP2085 experimental processing stabiliser for PP “combines cost efficiency with reduced VOC, allowing the resin producer to run the pelletisation step faster.” New stabiliser packages can reduce emission
Source: Solvay 42 COMPOUNDING WORLD | September 2018
www.compoundingworld.com
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