ADDITIVES | PVC
energy consumption and machine wear possible,” says Frank W Neuber III, Regional Segment Techni- cal Manager – Americas in the company’s Additives BU, BL-Advanced Surface Solutions. Among the new products are two oxidised HDPE
waxes (HDPEOx) with improved performance. These may be incorporated into PVC compounds as internal lubricants in place of existing HDPEOx waxes to enable higher outputs, or used as a secondary wax source. The Licolub PED 1301 and Licolub PED 2001 products are designed with drop points and viscosities that keep extruder pressure, gelation and fusion consistent with current typical offerings while increasing the amount of output with less energy consumption, the company says. The new PED waxes are available in powder
Figure 4: Comparison of output (left axis) against energy consumption when processing a PVC compound containing the new Licolub PED 1301 and PED 2001 grades compared to a typical competitive offering and other Clariant PEOx waxes (compounded on a Collin E30M laboratory compounder with an additive level 0.5%) Source: Clariant
form, which Neuber says makes them easier to incorporate and distribute into powdered com- pounds than granulated versions. They are also priced economically, he adds. Clariant has provided various PE and PP copoly-
Figure 5: Pressure levels at five zones in an extruder processing PVC compounds containing Licolub PED 1301 and PED 2001 waxes compared to a typical competitive offering and other Clariant PEOx waxes. The results indicate few or no process changes required Source: Clariant
mer waxes for PVC compounds for many years. However, according to Neuber, “recent requests for improved performance and viable alternatives to the diminished wax supply currently available to customers has prompted experimentation into the benefits of other Clariant wax products — Licocene PE 4201 and Licocene PP 6102 — and their subse- quent adoption by PVC compounders.” Barrel pressure and output-per-kWh energy comparisons of external lubricants in PVC, where only the external lubricant was changed at a dosage of 0.2 phr, have shown the two products to be able to reduce surface drag and improve wetting of fillers. Clariant’s Licolub CE-2, which is a highly modified polar copolymer wax designed for easy emulsification, has recently found use in liquid carriers for PVC colorant and additive systems used in both rigid and flexible PVC formulations. “Customers have reported that it goes into solution and suspensions easily, with excellent final perfor-
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