Designing New Graphene-Based, Ready-to-Use Formulations

The Sixth Element (Changzhou) Materials Technology – the leading producer of graphene oxide­ – reduced graphene oxide and graphene with a capacity of currently 1000 t/a and are continually driving innovation with graphene, identifying novel applications and designing appropriate products for these applications.

Since collaborating with Changzhou Fuxi Technology to design and develop heat dissipation technology for electronic devices, proposals have been made requesting for this technology be applied outside electronic devices.

Two potential applications of this technology have been identified: thermoplastic parts that cover heat sources, as well as large, complex metal-based 3D structures.

The Sixth Element has a great record in designing graphene-based formulations to be used in corrosion protection coatings. The ability to de-agglomerate and disperse is critical to a successful formulation.

These formulations synthesized by The Sixth Element are not available in many coating companies.  As a result of its experience, The Sixth Element can offer water-based and solvent-based graphene suspensions for corrosion protection formulations.

Whilst investigating the possibility of heat dissipation coatings with graphene, The Sixth Element identified that a balance must be struck between the mechanical properties of the coating systems and the addition of graphene to obtain the necessary heat dissipation.

After trialing different methods, the final decision was taken to offer a graphene-containing filler systems to the market where the graphene is already available in the required primary particle format.

This approach means the customer requires no special equipment, and the formulation can be done simply.

Metal substrate coatings must provide proper corrosion protection. In the case of heat dissipation requirements from metal surfaces, the additive providing corrosion protection should not influence the heat dissipation capacity of the coating system.

By combining the knowledge of how graphene works as a heat dissipation additive and its understanding of corrosion protection, The Sixth Element can offer a combination of two filler systems: SE5143, for the top-coat and final heat dissipation to the atmosphere, and SE5133, a zinc free system for corrosion protection, but is still able to dissipate heat.

Results from salt spray testing suggest that an epoxy primer with SE5133 as filler system and a dry film thickness of 100 µm, combined with a polyurethane top-coat having SE5143 as filler system and a dry film thickness of 40 µm, can withstand 700 hours.  

Designing New Graphene-Based, Ready-to-Use Formulations

Image Credit: The Sixth Element (Changzhou) Materials Technology Co.,Ltd.

Using the same primer with 100 µm dry film with the same top-coat with 40 µm dry film used for corrosion resistance testing, it has been proven that the surface temperature of steel is significantly reduced.

During testing, the maximum temperature achieved with a defined heat output is recorded, and the test specimen is exposed to air.

Using a low powered heat source (up to 3 W), the maximum temperature reduces by approximately 13%. When tested using higher powdered heat sources, the decrease in temperature can be more than 20%.

Designing New Graphene-Based, Ready-to-Use Formulations

Image Credit: The Sixth Element (Changzhou) Materials Technology Co.,Ltd.

The typical applications of heat dissipation coatings are:

Designing New Graphene-Based, Ready-to-Use Formulations

Image Credit: The Sixth Element (Changzhou) Materials Technology Co.,Ltd.

Obtaining high thermal conductivity of thermoplastic materials whilst not altering mechanical properties is challenging.

In a proof of concept, The Sixth Element used graphene of a low concentration as a thermal conductive pigment within the polymer while not altering the mechanical properties of the neat resin.

When using HDPE as a base polymer, the compound SE6120-H retained the mechanical properties and density of HDPE, while the thermal conductivity more than doubled. 

Table 1. Source: The Sixth Element (Changzhou) Materials Technology Co.,Ltd.

Specifications
  Water content
(%)
Density
(g/cm3)
Tensile Strength
(MPa)
Impact Strength
(KJ/m2)
Thermal conductivity
(W/m.k)
Melt index
(g/10min)
Test Standard GB 6284-2006 GB 1033-86 GB 1040-79 GB T 1843-2008 ASTM D5930 GB 3682-2018
Black particles 0.1-0.5 1.0-1.1 ≥20 ≥95 ≥0.6 0.2-1.0

 

This type of compound can be used to construct thermal conductive pipes. These pipes are utilized in ground source heat systems by transporting heated water to the surface and then into a heating system.

Designing New Graphene-Based, Ready-to-Use Formulations

Image Credit: The Sixth Element (Changzhou) Materials Technology Co.,Ltd.

This information has been sourced, reviewed and adapted from materials provided by The Sixth Element (Changzhou) Materials Technology Co.,Ltd..

For more information on this source, please visit The Sixth Element (Changzhou) Materials Technology Co.,Ltd..

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