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Conductive Carbon Blacks The Influence of Conductive Carbon Blacks on Rubber Properties - New Developments & Applications - Distributor of Ensaco Products.

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Presentation on theme: "Conductive Carbon Blacks The Influence of Conductive Carbon Blacks on Rubber Properties - New Developments & Applications - Distributor of Ensaco Products."— Presentation transcript:

1 Conductive Carbon Blacks The Influence of Conductive Carbon Blacks on Rubber Properties - New Developments & Applications - Distributor of Ensaco Products

2 Conductive Carbon Blacks Structure Surface Area Surface Quality Main carbon black properties Main rubber properties Rheological Mechanical Electrical properties

3 Conductive Carbon Blacks High Structure CB aggregate High void volume High DBP absorption DBP > 170 ml/100g

4 Conductive Carbon Blacks High Structure Longer incorporation times Easier ultimate dispersion Better surface finish Higher extrusion speed Higher Mooney viscosity Lower cure time Higher hardness Higher modulus Lower tensile and tear strengths More compounding flexibility Higher conductivity at lower loading other parameters being similar

5 Conductive Carbon Blacks High Structure Blacks bring Higher Conductivity at Lower Loading ? e - Polymer INSULATOR + _ v ~ Ohm ·cm +CB Conductive Network ++CB e-e- CONDUCTOR e-e- Polymer _ + + _ ! e - v ~ Ohm ·cm All CB … but...

6 Conductive Carbon Blacks High Structure Blacks bring Higher Conductivity at Lower Loading c [ *cm] CB % Percolation Curve SV Structure-Volume SV equivalency * SV * ( CDBP +24) * G. Kraus, J. Polymer Sci., 13, 8, 601 (1970)

7 Conductive Carbon Blacks As high structure blacks take up more space/volume, one can achieve the same filling level and consequently the same conductivity at a lower concentration

8 Conductive Carbon Blacks Structure Surface Area Surface Quality Main carbon black properties Main rubber properties Rheological Mechanical Electrical properties

9 Conductive Carbon Blacks High Structure & High Surface Area Furnace Process porosity High Structure & Low Surface Area MMM Process - ENSACO no porosity

10 Conductive Carbon Blacks Good dispersibility and excellent ultimate dispersion better mechanical performance and smoother surface finish tend to minimize curing time reduced inhibition of cure agents temper the viscosity increase imparted by the high structure High Structure & Low Surface Area

11 Conductive Carbon Blacks

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13 Structure Surface Area Surface Quality Main carbon black properties Main rubber properties Rheological Mechanical Electrical properties

14 Conductive Carbon Blacks Surface Quality A high oxygen content inhibits cure agent and increase cure time A high graphitization favors – electrical conductivity – thermal conductivity ENSACO - MMM Process TOF-SIMS surface analysis: VERY LOW O CONTENT RX Crystallographic analysis: HIGH GRAPHITIZATION

15 Conductive Carbon Blacks Some Rubber Applications BELTS: conveyor belts, transmission belts... HOSES: fuel hoses, discharge hoses… PROTECTIVE COATINGS, LININGS... FLOORING POWER CABLES: easy strippable, insulator and conductor shielding... FOOTWEAR: shoe sole... AUTOMOTIVE INDUSTRY: fuel injection systems... HEALTH: surgical tubing... SAFETY: safety systems for windows & doors ROLLERS: printing rolls... SEALS: o-rings, pipe gaskets... CEMENTS & PUTTY HEATING ELEMENTS PTC SWITCHES ANTICORROSION SYSTEMS Engine mount ANTI-VIBRATION SYSTEMS...

16 Conductive Carbon Blacks Incorporation in an unlimitted number of elastomers and elastomer blends

17 Practical Applications Conductive NEOPRENE conveyor belt cover compounds NBR conductive hose compounds FKM conductive compounds NR engine mount / anti-vibration system

18 Conductive Carbon Blacks HS & High SA HS & Low SA

19 Practical Applications Conductive CR Conveyor Belt Cover Compound 30 phr

20 Practical Applications NBR Conductive Hose Compounds 25 phr

21 Practical Applications FKM (Fluoroelastomer) Conductive Compounds Experimental data provided by DuPont Dow Elastomers, Japan

22 FKM Conductive Compounds Lower Mooney Viscosity rejected

23 FKM Conductive Compounds Shorter Vulcanization Time Cured properties: 177°C / 10 min

24 FKM Conductive Compounds Same Volume Resistivity

25 FKM Conductive Compounds Lower Compression Set

26 FKM Conductive Compounds Higher Moduli

27 FKM Conductive Compounds Higher Tensile Strength

28 FKM Conductive Compounds Lower Elongation at Break

29 FKM Conductive Compounds Same Hardness

30 FKM Conductive Compounds High Structure & Low Surface Area Carbon Blacks enable to compound and make Viton® A conductive (20 phr) Special thanks to DuPont Dow Elastomers, Japan

31 Practical Applications excellent resistance to fatigue / dynamical properties: lower storage modulus much lower tangent delta NR engine mount / anti-vibration system Ensaco 150 G required hardness and modulus at low loading higher rebound / lower hysteresis Medium-high structure black with a VERY LOW surface area DBP = 165 ml/100gBET = 44 m²/g

32 Carbon Black Conduction Mechanisms N. Probst, E. Grivei, Third International Conference on Carbon Black, Mulhouse (F), Proceedings (10/2000). Conductive CB s build a network at low concentration the ultimate conductivity depends on the DBP at a given pressure the contact resistance low [O - ] content ==> pure CB s ==> [CB + polymer]

33 Carbon Black Conduction Mechanisms N. Probst, E. Grivei, Third International Conference on Carbon Black, Mulhouse (F), Proceedings (10/2000).

34 Carbon Black Conduction Mechanisms Resistivity ( · cm) Pressure (kg/cm 2 ) No Significant Difference CB as such, in air

35 Carbon Black Conduction Mechanisms Density (g/cm 3 ) Clear Differentiation of Conductive Carbon Blacks CB as such, in air Resistivity ( · cm)

36 Carbon Black Conduction Mechanisms Resistivity in Polymer ( cm) Resistivity in Air ( ·cm) polyolefins crystalline elastomers SBR, NR... direct contact between the CB particles tunneling / polymer film between the CB particles CB in polymer versus CB as such, at the same VOLUME fraction c

37 Conductive Carbon Blacks Another vision of conductive CB networking New generation of compounds More compounding flexibility Higher conductivity at lower CB loading Another combination of properties Rheological Cure Compounding Mechanical Dynamical Electrical


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