Brochure: Carbon Additives for Polymer Compounds - Timcal Graphite

More documents

Recommendations

Info

TYpICAL AppLICATIonS FoR EnSACo® ConduCTIvE CARBon BLACk 10 Electrically conductive plastics THE SELECTIon oF A ConduCTIvE CARBon BLACk ENSACO® Conductive Carbon Blacks find their applications in an unlimited number of plastics. The combination of the polymer type and grade and the carbon black grade are determining the overall electrical and mechanical performance. The main parameter influencing the final conductivity of a finished part in a given polymer is the type and level of carbon black used. The higher the structure of the carbon black, the lower the level of carbon black needed to achieve the required conductivity. Nevertheless, in a minor way, other parameters like the additives in presence, the compounding or processing conditions may also influence the final conductivity of parts. Low surface area conductive carbon blacks show a particular advantage on dispersion and processing. Percolation curves – correlating the volume resistivity and the carbon black percentage – are a useful comparative tool to predict the conductivity in place and to select the more appropriate system. These curves are valid for a given formulation and sample preparation technique. The selection of the conductive carbon black will also influence: • the compounding behaviour (dispersibility, resistance to shear, mixing cycle, melt flow index, extrusion throughput); • the surface appearance of the finished material (number of surface defects); • the mechanical properties (polymer property retention, reinforcement); • the overall price – performance ratio. THE pREpARATIon oF A ConduCTIvE CoMpound Suitable mixing equipments for the preparation of black conductive compounds include internal mixers, twin screw extruders, single screw kneader machines and LCM. The feeding of low bulk density, soft flake-type carbon blacks into extruders requires the use of twin screw feeders and separate introduction on an already molten polymer (split feeding technology). SoME TYpICAL FInAL pLASTICS AppLICATIonS • handling of electronic components: carrier boxes, carrier trays, carrier tapes, etc.; • films: antistatic and conductive films, packaging films, garbage bags, etc.; • automotive industry: fuel injection systems, anticorrosion systems, fuel tank inlet, electrostatically paintable parts, etc.; • transport: mobile phone parts, wheels, containers, bins, pallets, etc.; • computer: antistatic articles for computer & accessories, CD player, etc.; • health: medical applications, cleanroom equipments, articles for antistatic workplaces, etc.; • antistatic flooring; • heating element; • sensors; • pTC switches; • uv protection and pigmentation. In the following pages there are some of the results of experimental work carried out on EN- SACO® Conductive Carbon Blacks in different polymer compounds. The data shown here are given as orientation and are valid for the particular formulations and sample preparation technique mentioned. Results in other polymers, full studies and publications are available upon request.
EnSACo® ConduCTIvE CARBon BLACkS In HdpE Infl uence of the carbon black type on the resistivity Compounding: laboratory Brabender internal mixer. Processing: compression moulding. The higher the structure of the carbon black, the lower the percolation threshold. At a concentration very near to the percolation level, when overmixed, ENSACO® 260 G off ers a higher consistency in resistivity resulting from its higher shear stability in extreme working conditions. At a concentration far above the percolation level, both blacks are very stable in resistivity when overmixed. ENSACO® 260 G shows a consistent lower resistivity. various carbon blacks in HdpE Volume Resistivity [Ohm.cm] 10 9 10 7 10 5 10 3 10 0.1 0 10 20 30 40 50 Carbon Black % Resistivity vs mixing time - 18% carbon black Volume Resistivity [Ohm.cm] Brabender Mixing Time [min] Resistivity vs mixing time - 25% carbon black Volume Resistivity [Ohm.cm] 800 700 600 500 400 300 200 100 0 4 5 6 7 8 9 10 7.0 6.5 6.0 5.5 5.0 4.5 4.0 3.5 3.0 4 5 6 7 8 9 10 Brabender Mixing Time [min] ENSACO® 250 G ENSACO® 260 G ENSACO® 350 G ENSACO® 250 G ENSACO® 260 G ENSACO® 250 G ENSACO® 260 G 11 TYpICAL AppLICATIonS FoR EnSACo® ConduCTIvE CARBon BLACk
Page 1 and 2: Carbon Additives for Polymer Compou
Page 3 and 4: Contents EnSACo® Conductive Carbon
Page 5 and 6: Introduction to TIMREX® Graphite a
Page 7 and 8: EnSACo® Conductive Carbon Black fo
Page 9: EnSACo® Conductive Carbon Black TI
Page 13 and 14: EnSACo® ConduCTIvE CARBon BLACkS I
Page 15 and 16: nBR ConduCTIvE HoSE CoMpound A B Co
Page 17 and 18: power cables and accessories Conduc
Page 19 and 20: Incorporation of graphite powder in
Page 21 and 22: InFLuEnCE oF TIMREX®GRApHITE And C
Page 23 and 24: THERMALLY ConduCTIvE poLYMERS Therm

Brochure: Carbon Additives for Polymer Compounds - Timcal Graphite

Create successful ePaper yourself

Delete template?

Save as template?