PVC | STABILISERS/LUBRICANTS


be used to replace existing ones without any performance deterioration. “Valtris has a wide range of additives for flexible


PVC and as such is ideally positioned to provide complementary products to maximise the individu- al performance of each additive,” Hollo says. She cites the example of its well-established heat stabiliser Lankromark LZB996, which is highly compatible with the company’s Intercide and Micro-Chek biocides.


Building innovations IKA Innovative Kunststoffaufbereitung offers high performance EuroStab calcium-based and GreenStab heavy metal-free heat stabilisers. Although primarily targeting building product applications such as window profile, foam profile and pipe, it also provides a full range of stabilisers


for specialist and niche applications such as rigid sheet, high temperature cables and high Vicat injection moulding. In the building product sector, IKA sees an ongoing trend for stabilisers imparting exceptional earlier colour brightness, heat stability and surface finish and offers systems with or without calcium acetylacetonate co-stabiliser additive. “Our stabilisers can be supplied in the full range


of product forms from powder to low dusting compacted granule and melted tablet, ensuring that we have all bases covered,” says Thomas Hillen, Managing Director and Head of Research at IKA. He says that IKA’s novel melted tablet technol- ogy, marketed as S-granule, is produced via a patented production technology via extrusion and under-water granulation and is important in terms of effectiveness. “Manufactured by continuous process at temperatures that prevent secondary


High-efficiency lubricant options


Sasol is introducing two new Fischer- Tropsch lubricants, which it says are engineered for extrusion of PVC-U pipes, conduit, and profiles. Pat Haugen, Market Development Man- ager Americas at the company, says the Sasolwax P100 and P200 products will have PPI and NSF approvals, making them suitable for potable water, sanitary, and waste pipes. The Sasolwax P100 and P200 additions are based on an existing Sasol lubricant, Sasolwax B52. This is described as highly external in function with some internal lubrication and metal release character. Haugen says it


is 30 to 45% more efficient than 165F paraffin waxes. The new Fischer- Tropsch products are derived from the fully synthetic production of wax, which is said to provide low impurity levels, high crystallinity, n-alkane linearity, low viscosity, excellent thermal stability and lubricating properties. According to Dr Phil Richards,


Sasol’s Technical Leader North America, the Sasolwax P100 and P200 products have been created to meet the industry’s need for a wider operating window (peak torque versus equilibrium torque versus nominal operating temperature). Haake torque


rheometry curves show the modifica- tions to the products provide the same high efficiency as Sasolwax B52, but with a shift toward earlier shear heat generation. This results in a faster fusion time.


“Utilising highly efficient Fischer-


Tropsch materials means less lubricant to interfere with fusion during extru- sion, reduced die swell, and less die build-up” says Steve Torchia, Senior Manager Global Polymer Additives at the companmy. “We have observed higher melt viscosity and a stiffer melt exuding from the dies. This means less die swell and enhances the calibrator’s role in controlling wall thickness.” In one series of tests, Fischer-


Tropsch waxes were compared with 165F paraffin formulations in produc- tion of sanitary pipes, using flood feeding. With the new waxes, melt pressures were reduced by up to 20%, allowing for increasing screw speed for output rate increases from 5 to 15%. Average over-weight was less than 5% with the Sasolwax based formula, against slightly over 7% with the 165F paraffin. “For a plant producing 20,000t/yr of compound, that 2% saving in material is worth half a million dollars,” says Torchia. � www.sasol.com


26 COMPOUNDING WORLD | June 2020 www.compoundingworld.com


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