How to improve the surface adhesion performance of polyimide film

Polyimide film is a very popular film product now, with a wide range of applications and excellent performance. However, during use, some customers and friends will encounter problems with its surface adhesion performance. So, how to improve the surface adhesion performance of polyimide film? Professional manufacturers will give the answer below, come and see.

Polyimide film (PI) is a special synthetic polymer material with excellent physical and mechanical properties and excellent electrical and chemical stability. It is widely used in aerospace, electrical insulation, microelectronics and other industries (as a dielectric spacer, protective layer, and base layer of metal foil). Because the PI film has a smooth surface, low chemical activity, and poor adhesion to metal foil (aluminum foil, copper foil, etc.). ), the surface of the PI film needs to be treated or modified to improve the adhesion of the PI surface.

At present, in all the surface treatment and modification methods of polyimide film, due to the process and cost factors, acid-base treatment has been extensively studied. Some documents have reported that this kind of improvement of the wettability and The method of adhesion, but the main performance of industrial products after treatment lacks due reports and attention.

By treating the surface of the polyimide film with oxalic acid solution, sodium hydroxide and desalted water, without affecting the apparent quality and internal mechanical properties of the polyimide film, the effects of different acid-base concentrations and the corresponding treatment time were studied. After the surface treatment, the adhesion performance of the polyimide film is affected, and the application results of the surface modification of the polyimide film are as follows:

1. At the current production speed, changing the acid-base concentration has no obvious effect on the mechanical properties of the polyimide film after treatment.

2. It can be seen from the characterization of atomic force microscope that the roughness of the polyimide film is greatly increased after acid-base corrosion.

3. After acid-base treatment, under the same acid-base concentration, the peel strength of PI increases with the extension of the treatment time; at the same vehicle speed, the peeling force increases from 0.9Kgf/cm with the increase of the acid-base concentration To 1.5Kgf/cm.

4. The cleanliness of the PI membrane surface is significantly improved, which solves the quality and production abnormalities caused by downstream customers’ garbage.