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Extensional / Elongational Flow Mixing
 

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Home Carbon Nanotubes
Carbon Nanotubes

Introduction: Carbon Nanotubes

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Carbon Nanotubes are being introduced for their enhanced performance. These include thermal and electrical conductivity, structural strength and stiffness, and thermal stability.  A recently performed test showed that the Tek-MixTM process can disperse and percolate carbon nanotubes such that a 3½ % carbon nanotube loading can be used in pure HDPE, versus typical levels of 7% (shown by the arrow in the graph). It is difficult to disperse CNT's in HDPE; thus, high loadings are normally required to compensate for incomplete dispersion.  As reported in Bayer literature, typical CNT dispersions have a large agglomerate size, such as shown below for Baytubes C 150P.  The objective is to turn 750 µm  particles, as received, into a network of fine nano fibers of diameter 1 to 2 nm.

For more information about this program and CNT materials in general,  click here..


Tek-MixTM - Extensional / Elongational Flow Mixing
The Next Step in Mixing & Blending




 

Carbon Nanotubes

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New Data:  CNT Concentration Reduced to 3.5%



New tests show that 3.5% Carbon Nanotube (CNT) direct mixing in HDPE and processed with the Tek-MixTM mixer achieves equivalent electrical conductivity as a compound prepared using a masterbatch made in a twin-screw compounder, and let down to 7% on an optimized twin-screw extruder. No Masterbatch step is required. 50% less CNT required. This reduces material cost  by over $5 per pound of product made; at a 100 lbs per hour rate, that equates to over $2 million annual savings from reduced carbon nanotube usage! *  

Why settle for this? 
When you can have this?
TEM Twin-Screw Product
TEM Tek-MixTM Product
The photos and graph above compare the morphology of Baytubes C150P carbon nanotubes mixed with Basell Hostalen 9555 HDPE. The Tek-MixTM product shows improved orientation and uniform blending, required for percolation.

* Assumes CNT cost of € 200.00/Kg; Resin cost of € 2.00/Kg; 7%  loading reduced to 3.5% loading;  5,000 hours / year operation at a throughput rate of 50 Kg/ hour.
 


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Found on the Web: Plasticstoday.com

Plastics remained a bright spot for U.S. trade in 2008 

By Tony Deligio
Published: October 21st, 2009

Despite a decline of 23% in the final quarter of the year, U.S. plastic exports increased by 6.7% in 2008 and eclipsed $50 billion for the first time ever, according to the latest international trade statistics for the plastics industry, which are summarized in a new report from the Society of the Plastics Industry (SPI; Washington, DC).

Exports during the fourth quarter of 2008 were off 23% from the prior quarter and 12% from the same quarter in 2007, but for the year, they exceeded $51 billion and accounted for approximately 4.4% of all U.S. exports. An overall trade surplus in plastics was not only maintained but expanded, as imports increased, but by only 3.0%, to just under $39 billion. The overall plastics trade surplus grew by nearly 20% from $10.9 billion in 2007 to $13.0 billion in 2008. Much of that surplus resulted from $18.4 billion in resins and raw material exports.

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