ADDITIVES | LUBRICANTS AND PROCESSING AIDS
In recent laboratory tests, Clariant compared a
Figure 1: Output rates and energy inputs for Clariant’s Licolub PED 2001 P oxidised olefin waxes compared to legacy alternatives Source: Clariant
according to Madelyn Bekker, Principal Engineer for Waxes at ExxonMobil. “Paraffin waxes allow a wide processing window, enable consistency in technical performance, and facilitate consistent fusion times with different filler levels, which provides flexibility for the PVC product manufacturer,” she says. Supply chain disruption and the need to seek
alternatives has been a priority for many com- pound formulators over the past 12 months. “Short- ages in currently used raw materials have forced companies to devote a lot of time identifying and assessing alternatives for use in lubricants and processing aids,” says Frank Neuber, Regional Technical Segment Manager for the Americas at Clariant. “This has opened the door to ‘non-tradi- tional’ options, such as highly crystalline PP waxes (for example, Clariant’s Licocene PP 6102), that can improve output and surface appearance.”
range of montan ester waxes, including the standard Licowax E versions and the Licocare equivalents (Licocare grades are based on renew- able feedstocks containing rice bran wax - RBW). Neuber shared results of these tests at AMI’s PVC Formulation conference held in March 2022 in the US. He reported that the montan ester wax Licowax E and Licocare RBW 102 yielded the highest Vicat softening point when compared to common stearate ester waxes, such as GMS, in a tin-stabilised sample system. The lab tests showed that montan ester waxes (and their new biobased RBW clones) also provide less volatility than stearate ester waxes, reports Neuber. Lower volatility reduces plate-out, bloom- ing, hazing and odor in Ca/Zn-stabilized PVC systems, he explains. “In addition, the melt strengths of formulas with montan esters were superior to stearate ester formulas, suggesting a more robust product may be made with montan esters. Importantly, our clients reported better fill of difficult geometries in asymmetric dies with montan and RBW waxes,” reports Neuber. Clariant also compared its relatively new oxidised olefin waxes (such as Licolub PED 2001 P) compared to “legacy” versions (Figure 1). As reported in the July 2021 issue of Compounding World, these products are designed to enable higher outputs, maintain low relative energy inputs, and keep pressure, gelation and fusion properties comparable to the legacy lubricants. Clariant’s non-polar olefin waxes, such as Licocene PE 4201 and PP 6102, offer external lubrication with reduced energy consump- tion in PVC formulations says Neuber.
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