High-insulativity capacitor mica paper and preparation method thereof

Abstract

The invention discloses a high-insulativity capacitor mica paper and a preparation method thereof. The mica paper comprises a mica paper base material, and the surface of the mica paper base materialis subjected to surface roughening treatment; a reinforced mica paper layer is formed on the surface of the roughened part of the mica paper base material, and is formed by hot-pressing a reinforced mica slurry layer on the surface of the mica paper base material for molding; the reinforced mica slurry layer takes refined mica slurry as a base material, the slurry is added into a conductive fillersolution and stirred uniformly to prepare a precursor slurry, nanofibrillated cellulose aerogel and nanoscale titanium dioxide particles are mixed according to a mass ratio of 3:1 to serve as reinforcing filler, then the reinforcing filler is modified through a silane coupling agent KH550, and then the modified reinforcing filler is evenly mixed with the precursor slurry to obtain the high-insulativity capacitor mica paper. The mica paper is good in insulativity, stable in performance and high in strength at the same time.

Description

technical field [0001] The invention relates to the technical field of electronic materials, in particular to mica paper for high-insulation capacitors mainly used in electronic products and a preparation method thereof. Background technique [0002] Capacitors are one of the electronic components widely used in electronic equipment, and are widely used in DC blocking, coupling, bypass, filtering, tuning loops, energy conversion, control, etc. in circuits. With the rapid development of electronic information technology, the upgrading speed of digital electronic products is getting faster and faster. The production and sales of consumer electronic products, mainly flat-panel TVs, notebook computers, digital cameras and other products, continue to grow, which drives the growth of the capacitor industry. [0003] Mica capacitor is a kind of capacitor, and its shape is mostly square. Mica capacitor uses natural mica or mica paper as the medium between capacitor electrodes, which...

AI Technical Summary

Problems solved by technology

[0004] 1. The shielding performance, insulation performance, tensile strength and stability of mica itself have little room for improvement, making it difficult for the existing single-material mica paper on the market to meet the increasingly high performance requirements of electronic equipment, especially the insulation performance and Shielding performance

[0005] 2. The mica paper made directly from mica sheets mainly relies on the combination of van der Waals force and electrostatic force between mica sheets. Its mechanical strength and toughness are not good. When preparing insulating capacitors, it is easy to be damaged during stretching and forming. Due to the unsatisfactory tensile strength, the mica paper is easy to break and the surface impact resistance is insufficient, resulting in an increase in the proportion of defective products, affecting the performance of related electronic products and low production efficiency

[0006] In order to improve the mechanical strength of mica paper and ensure its insulation performance, the current reinforcement method mainly uses aramid fiber as the reinforcing material of mica paper. This kind of aramid fiber mica paper has both the excellent insulation performance of mica and aramid fiber. The fiber has excellent mechanical properties. However, in the aramid mica paper-based material, due to the poor interfacial bonding force between the aramid fiber and mica, the structure of the paper-based material is loose, which seriously affects its mechanical properties and electrical insulation properties, limiting its further use. , it is difficult to meet the use of products in high-performance capacitors in the high-end field