ADVERTISEMENT FEATURE
Processing aid for production of HFFR composites
To learn more about VISCOSPEED and its applications visit
www.viscospeed.com
by
VISCOSPEED in semi- conductive compounds
The inexorable growth of renewable energy to replace fossil-based energy is highly important to meet European climate goals of cutting greenhouse emissions by 40% compared to 1990. Most of this renewable energy is produced by solar panels or off and on-shore wind turbines, presenting the challenge of transporting it from the place of creation to the final user. For this purpose — and to support
the charging infrastructure required for the move to electric vehicles — demand for medium (MV) and high voltage (HV) cables is expected to increase strongly in upcoming years. These types of cables are typically
composed of copper wires, two concentric semi-conducting layers (conductor and insulation shield) with an insulation layer in between, bedding materials, and protective and semi-conductive jacketing. The semi-conducting layers contain high levels of conductive materials such as carbon black or graphite and are required to homogenise the electrical field in the insulation material to prevent failure. Innospec’s new VISCOSPEED products
are excellent low-dosage, organic processing aids for high filler content compounds and have proved to be beneficial in semi-conductive compounds. Initial trials have yielded improved processing and less breakdown of the
primary carbon black aggregates, which is important for good conductivity. Additionally, VISCOSPEED and
VISCOSPEED HP-X address nicely the problem of increasing EVA-copolymer prices, allowing for the use of simple LDPE polymer in so-called bonded semi- conductive compounds. VISCOSPEED, polar by nature, allows
for a quick wetting and dispersion of the conductive carbon black, yielding better conductivity (see table) and in principle shorter mixing cycles. Another important specialty, especially
for the French and US markets (due to regulation), is the ‘easy strippable’ insulation shield. When using VISCOSPEED or VISCOSPEED HP-X, the stripping force on the XLPE or EPR insulation can be decreased to a level far below the critical
PE-Wax 53
VISCOSPEED
VISCOSPEED HP-X Additives Peroxide
Properties
MFI (21.6kg @ 120°C) Stripping force [N*cm]
38.5 5 - -
3.5 0.75
PE-Wax 12 28
Vol. resistivity (Ohm*cm) 55
value of 20 N*cm. Besides the optimised processing, this is a highly relevant finding making VISCOSPEED a new and exciting addition to the toolbox of R&D engineers for these cable compounds. VISCOSPEED can be applied in semi-
conductive compounds as a processing aid, and to improve conductivity and flowability. Furthermore, VISCOSPEED helps avoid the use of frequently requested high vinyl acetate content EVA-co-polymers, allowing formulators to use more abundant low vinyl acetate content base polymers or even non-polar polyethylene as a base material. Click HERE to learn more about
formulating semi-conductive compounds with VISCOSPEED. More insights will be presented at this year’s Cables conference in Cologne, Germany.
VISCOSPEED products in strippable semi-conductive formulations Components EVA 33 MFI 43 Carbon Black PE-wax
VISCOSPEED 53
38.5 -
5 -
3.5 0.75
VISCOSPEED 10 18 50
38.5 - -
5 3.5 0.75
VISCOSPEED HP-X 13 15 45
VISCOSPEED HP-X 53
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