products | Polymers and additives POLYAMIDES DSM extends Akulon PA6 range
DSM has announced two new additions to its range of UV-stabilised glass-fibre- reinforced Akulon PA6 resins for the production of paint-free visible structural automotive components. Launched at the JSAE
Automotive Engineering Expo in Yokohama in Japan and now available globally, the first new grade is a 50% glass-reinforced resin intended for the production of exterior mirror bases. It is said to provide an excellent surface quality even in complex moulding applica- tions.
The second new addition is 30% glass-reinforced and is aimed at applications such as production of gas-assisted
PIGMENTS Rowa adds pigment preparations
Rowa Lack has introduced Rowalid Series E pigment preparations for manufactur- ing plastisols and plasticiz- er-based pigment pastes that are used in the fabrication of tarpaulins and synthetic leather. The products eliminate the need for complicated dispersion equipment, such as hopper mills, three-roll mills or ball mills. Users can simply stir the preparation into plasticiz- ers to obtain high-quality pigment concentrates that are claimed to be as good as commercial plasticizer-based pigment pastes. The Rowalid products are
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highly concentrated single-pig- ment preparations incorporat- ed in a solvent-soluble copolymer of vinyl chloride. They can be quickly and uniformly dispersed in all media that are compatible with the copolymer. If the PVC copolymers are to be pro- cessed using screw presses, calenders or mixing mills, it is recommended that the Rowalid products are added during batching. In combination with the other additives – such as stabilizers, slip agents and fillers – they can be intensively mixed with the PVC powder using standard plastics mixers. For direct incorporation in
COMPOUNDING WORLD | July 2014
the PVC paste, the required quantity of the Rowalid preparation is slowly added to the stirred plastisol. Depending on the stirring speed, the preparation’s binder dissolves relatively rapidly and the pigment is very finely dispersed. For preparation of a pigment/plasticizer concen- trate, 25 parts of the Rowalid preparation are slowly added with stirring to 75 parts of plasticiser. The binder of the preparation dissolves within about 30 minutes, or after about 10 minutes if the plasticiser is heated to 80°C. ❙
www.rowa-lack.com
moulded door handles. The company says that the
two grades were originally developed for an India-based automotive system supplier that wanted to improve the appearance of unpainted bases on the external mirrors that it
Automotive mirrors are one of target applications for DSM’s new PA6 compounds
produces for a Japanese car maker. The company developed the resins locally, utilising its global PA6 knowhow and its Pune, India-based compounding operation. ❙
www.dsmep.com
ELECTRICAL CONDUCTIVITY
Additive provides electronic shielding
FiberGraf Materials has launched a new nickel-coat- ed graphite additive for providing EMI/RFI shielding properties in plastics. The additive is designed to
provide high shielding effectiveness at lower costs. It can be compounded at high loading levels – up to 65% has been achieved. Process- ing speeds and efficiencies are also improved. Two new grades are on
offer: GrafMat A280N60 has a 280 micron average particle size, while the corresponding figure for GrafMat A90N60 is 90 microns. Both grades contain 60% nickel by weight – the thin metal coating completely encapsulates each particle to create a free flowing powder that be incorporated into thermo- plastics and elastomers. In one application, a TPE with a 40% additive loading showed excellent electrical conductivity even after being twisted through 180˚. FiberGraf says that GrafMat replaced a mixture of four other additives in this compound, boosting processing efficiency and reducing scrap rates. FiberGraf claims that its
GrafMat products can offer substantial cost savings compared to other nick- el-coated carbon and silver-coated additives. ❙
www.fibergrafmaterials.com
www.compoundingworld.com
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