When using copper powder as the conductive filler to prepare the conductive ink, what is the appropriate amount of copper powder added, and what specific effect does the added amount of copper powder have on the conductive performance of the conductive ink.

Printed electronics is an advanced electronics manufacturing technology that has emerged and popularized in recent years. Conductive ink is a key material in printed electronics manufacturing technology. Copper powder conductive ink has also attracted much attention. The main components of copper powder conductive ink include binder and conductive filler copper powder. Among them, the binder is the main film-forming substance of the conductive ink, and the use of copper powder as the conductive filler determines the conductivity of the conductive ink.

Using phenolic resin as the binder and micron copper powder as the conductive filler, the conductive copper film was prepared by screen printing technology. The resistivity of the copper phenolic resin conductive ink coating was tested at different positions, and five data points were taken to find the value. average value. The resistivity of the conductive coating changes with the mass fraction of the conductive filler copper powder as shown in the figure.

The appropriate amount of copper powder added is between 60% and 80%. When it is less than 60%, the copper powder is insufficient, the conductive ink is too thin, the copper powder in the formed conductive coating cannot be fully contacted, and the resistivity of the conductive coating is too large. When the copper powder is added in an amount greater than 80%, the conductive ink becomes viscous and the painting performance is not good. It is difficult to form a conductive coating through screen printing, and the conductive coating has a large resistivity or even non-conductive. It can be seen from the figure that with the increase in the amount of copper powder added, the resistivity of the conductive coating first drops and then rises. When the amount of copper powder added is 70%, the resistivity of the copper powder conductive ink coating reaches 53.865×10–3Ω·cm at the lowest.

In the specific application, the appropriate amount of copper powder should be selected, too little or too much is not conducive to the resistivity of the conductive coating. If you have any enquiry of copper powder, please feel free to contact us at admin@satnano.com