Recently, some customers have inquired about the appropriate amount of copper powder when preparing conductive ink using copper powder as a conductive filler, and what specific effect does the addition amount of copper powder have on the conductivity of the conductive ink.
Printed electronics is an advanced electronics manufacturing technology that has emerged and spread 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 conductive ink, and the use of copper powder as conductive filler determines the conductivity of conductive ink.
Using phenolic resin as the binder and micron copper powder as the conductive filler, the conductive copper film is prepared by screen printing technology. The electrical resistivity of the copper phenolic resin conductive ink coating is tested at different positions. Five data points are taken to obtain Its average. 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 is 60%~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, 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 decreases 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.