Chemical method to improve film adhesion and achieve double-layer compounding of dielectric films

Abstract

The invention provides a method for chemically improving film adhesion to realize double-layer compounding of dielectric films, comprising the following steps: firstly treating the surface of BOPP film with a certain concentration of chromium trioxide solution, cleaning, drying, and then A layer of high dielectric material is cast on the surface of the film to obtain a double-layer composite film. The advantages are: (1) the oxidation of chromium trioxide is used to oxidize the methyl group on the surface of the BOPP film into a carbonyl group, increasing the surface energy of BOPP, Thereby increasing the interlayer bonding force of the double-layer composite film and realizing the double-layer composite of the two; (2) BOPP has lower loss and higher breakdown, but the dielectric constant is low, which limits its use. The dielectric constant of high-dielectric materials is relatively large, but the loss is relatively large. Usually, it is difficult to combine the two materials together. This method realizes the double-layer compounding of BOPP and high-dielectric materials, combines the advantages of the two materials, and improves the Energy storage density of film capacitors.

Description

technical field [0001] The invention relates to a method for chemically improving film adhesion to realize double-layer compounding of dielectric films, which belongs to the field of high dielectric organic film capacitors. Background technique [0002] PP has been widely used in food packaging, automobiles, chemical equipment, pipelines, containers, household appliances, etc. because of its low density, low price, non-toxicity, and good mechanical properties. However, PP itself has low polarity, low surface energy, and high degree of crystallization. It is quite difficult to form a good adhesion layer, which increases the difficulty of coating adhesion of PP. Therefore, the surface of PP must be treated to improve its adhesion to the coating layer. Surface treatment can be roughly divided into two categories: physical and chemical. Physical methods mainly include plasma treatment, corona treatment and other methods. This method requires a large investment in equipment, and...

AI Technical Summary

Problems solved by technology

Biaxially oriented polypropylene (BOPP) as a mainstream capacitor material has the advantages of high dielectric breakdown strength, low dielectric loss, controllable surface roughness, small thickness deviation, good film roll conditions, etc., but the energy storage density is small, Limit his usage scenarios

Organic high-dielectric materials have high dielectric constant and breakdown field strength, but the loss is large, which limits its practicality

Images