A conductive carbon powder, a method for the manufacturing thereof and use thereof

Abstract

The present invention relates to a conductive carbon powder emanating essentially from lignin, a method for the manufacturing thereof and use thereof. Said powder may emanate from an electrically conductive carbon intermediate product, in turn emanating essentially from lignin Further, uses thereof and compositions comprising said carbon powder are disclosed. Additionally methods for manufacturing said conductive carbon powder, also involving an electrically conductive carbon intermediate product emanating essentially from lignin, are disclosed together with a method for making said compositions.

Description

FIELD OF INVENTION[0001]The present invention relates to a conductive carbon powder emanating essentially from lignin, a method for the manufacturing thereof and use thereof. Said powder may emanate from an electrically conductive carbon intermediate product, in turn emanating essentially from lignin. Further, uses thereof and compositions comprising said carbon powder are disclosed. Additionally methods for manufacturing said conductive carbon powder, also involving an electrically conductive carbon intermediate product emanating essentially from lignin, are disclosed together with a method for making said compositions.BACKGROUND[0002]Conductive plastics are used in many different applications where electromagnetic interference and electrostatic discharge must be avoided. Examples include packaging material for consumer electronics, computer or mobile phone housings, piping and tanks for flammable liquids such as gasoline tanks, wires and cables. Conventional plastics (thermoplasti...

AI Technical Summary

Benefits of technology

The invention relates to a polymer compound that incorporates conductive carbon powder. The resulting mixture has a lower volume resistivity (measured after the percolation point) of (100-106) Ω·cm. This means that the mixture has better electrical conductivity, making it useful in applications such as electronics and sensors.

Problems solved by technology

Conventional plastics (thermoplastics and thermosets) have poor electrical conductivity and are prone to building up static electricity.

The mechanical performance of the plastic, however, suffers from adding pulverized conductive material as impact strength and ductility decrease.

The most commonly used conductive material is conductive carbon black, a special and expensive grade of carbon black.

In the production of conductive carbon blacks, pyrolysis is followed by expensive post treatment steps to increase conductivity, notably steam exposure to increase the surface area and extraction to remove contaminants.

Carbon blacks and especially conductive carbon blacks have a strongly negative impact on the environment and a high CO2 footprint due to the fact that fossil raw materials are used in a highly energy intense production process.

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