Graphene nanotubes for electrically conductive silicones: stable conductivity and maintained mechanical properties

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TUBALL™ nanotubes provide superior electrical conductivity to silicone compounds while retaining mechanical properties and minimally impacting the host matrix.

TUBALL™ graphene nanotubes are applied via the easy-to-use additive TUBALL™ MATRIX, which is a line of concentrates based on polymer carriers and pre-dispersed TUBALL™ graphene nanotubes.


TUBALL™ graphene nanotubes: Good performance on all key parameters

In contrast to other conductive agents, TUBALL™ graphene nanotubes are a versatile conductive agent offering good performance on all key parameters

Parameter

Highly conductive carbon black

Metallic
(paste form)

MWCNTs

TUBALL™ MATRIX

Working dosage

8 wt.%

30 wt.%

5–10 wt.%

4 wt.%

Resistance requirements (Volume Resistivity)

<50 Ω·сm

Resistance achieved
(Volume Resistivity)

10–102 Ω·сm
(not consistent from batch to batch)

<30 Ω·сm

<100 Ω·сm

<50 Ω·сm

Influence on mechanical performance

strong negative

strong negative

strong negative

none

Influence on viscosity and extrusion rate

strong negative

negative

strong negative

acceptable

Influence on rheology

strong negative

negative

strong negative

none

Dust formation during production

yes

yes

yes (but none in the case of a masterbatch)

none

Complicated processing (separate production unit, additional compounding stages)

yes

no

yes

no

“Hot spots” (resistance varies)

yes

none

possible

none

Stable resistance over time

no

yes

yes

yes

Longer life cycle of compound and moulded parts

no

no

no

yes

Carbon release on surface

yes

none

none

none

Cost of anti-static property

comparable

high

comparable

comparable

Key benefit 1: Stability of conductive properties

When using carbon black, because of the high concentration required (10% or more) and the spherical shape of the particles, a phenomenon known in the industry as “carbon release” takes place, where the conductive additive is present on the surface of the sample.

In contrast, graphene nanotubes, owing to their greater length-to-diameter ratio, are not released to the surface.

If materials will be used under conditions of deformation, it is important that stable resistivity is maintained. With TUBALL™ MATRIX, the resistivity is maintained below the target value even after stress-strain.

High dynamic pressure applications – conductive LSR with 2.5 wt.% TUBALL™ MATRIX 601

Conductive HCR: TUBALL™ vs carbon black

Key benefits 2: Maintained mechanical properties

TUBALL™ nanotubes, in contrast to traditional conductive agents, minimizes the impact on compound elasticity and tensile parameters, viscosity and rheological properties

Physical properties of conductive LSR with 4% TUBALLTM MATRIX 601

Key benefit 3: Standard processing and mixing equipment

TUBALL™ MATRIX can be diluted into compounds through the use of standard silicone compounding equipment (2-roll mill, kneader). Other approaches for masterbatch dilution may be used provided that their mixing efficiency is sufficient.

More information about the key parameters for masterbatch dilution and compound processing can be found in the processing guidelines.


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OTHER BENEFITS

  • Extremely low loadings of TUBALL™ that preserve properties
  • Permanent and uniform electrical conductivity without “hot spots”
  • Maintained rheology of the uncured compound
  • Minimal influence on mechanical properties including softness

TUBALL MATRIX for LSR, RTV

601
Tuball
MATRIX 601
Non-crosslinkable conductive additive for liquid silicones

Application

Elastomers

Materials

Silicones, LSR, RTV

Carrier Media

Polydimethylsiloxane

MATRIX 601
602
Tuball
MATRIX 602
Crosslinkable conductive additive for liquid silicones

Application

Elastomers

Materials

Silicones, HCR, LSR, RTV

Carrier Media

Vinyl-terminated polydimethylsiloxane

MATRIX 602

TUBALL MATRIX for HCR

602
Tuball
MATRIX 602
Crosslinkable conductive additive for liquid silicones

Application

Elastomers

Materials

Silicones, HCR, LSR, RTV

Carrier Media

Vinyl-terminated polydimethylsiloxane

MATRIX 602
605
Tuball
MATRIX 605
Crosslinkable conductive additive for HCR silicones

Application

Elastomers

Materials

Silicones, HCR

Carrier Media

Vinyl-terminated polydimethylsiloxane

MATRIX 605

Please pay close attention to processing guidelines for TUBALL™ MATRIX 601/602 for liquid silicones and processing guidelines for TUBALL™ MATRIX 605 for high consistency silicones


Download PDF version:
PROCESSING GUIDELINES TUBALL MATRIX 601 602 ENG
pdf
6.39 MB
PROCESSING GUIDELINES TUBALL MATRIX 605 ENG
pdf
3.65 MB

Or watch video instruction:

Conductive colored HCR: Processing guidelines for TUBALL™ MATRIX 605


Application case

Connecting Cable Sleeve
click to view case
Connecting Cable Sleeve

Additional resources:

Conductive Silicones - LSR, RTV, HCR and PSA

Electrical resistivity guidelines


High-performance Rubbers and Silicones with Graphene Nanotubes


Review of NAUM Nanoaugmented Materials Industry Summit 2018 in Shanghai



Contact us to discuss your project specifications or to request a TUBALL MATRIX sample

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