Preparation method of capacitor roughened film capable of long-term operation on UHV power grid

Abstract

The invention belongs to the field of capacitor membrane preparation, and particularly relates to a roughening membrane preparation method of a capacitor capable of operating in a super-high-voltage power grid for a long time. The method includes steps of preparation for materials and production conditions, melt extrusion through an extruding machine, utilization of a chill roller and air cooling, longitudinal stretching, and horizontal stretching and the like. The capacitor roughening membrane prepared in the method has stable and complete physical performance, and is high in anti-ageing performance, and low in rejection rate.

Description

Technical field: [0001] The invention belongs to the field of capacitor film preparation, and in particular relates to a method for preparing a capacitor roughened film that can run on an ultra-high voltage power grid for a long time. Background technique: [0002] With the establishment of the west-to-east power transmission during the "Twelfth Five-Year Plan" period in my country, the construction of UHV power grids is a long-term strategic plan that is essential for energy conservation and resource balance in my country. In the prior art, UHV power grid capacitors use polypropylene roughened film as the medium. This film has electrical characteristics such as high voltage resistance and low dielectric loss, which are superior to other films. The website of the State Intellectual Property Office of China has published a patent document with the patent number CN102324298 titled "A Production Method for Coarsening Films Used in UHV Power Grid Supporting Capacitors", but the ...

AI Technical Summary

Problems solved by technology

The website of the State Intellectual Property Office of China has published a patent document with the patent number CN102324298 titled "A Production Method for Coarsening Films Used in UHV Power Grid Supporting Capacitors", but the invention does not specifically describe the selection of raw materials, that is, raw materials Particle composition indicators, including isotacticity, molecular weight distribution, heat-resistant and antioxidant components, etc. These indicators have a great influence on the physical properties of the film. If the selection is not good, many properties of the produced products will be poor, making The produced products have a high scrap rate and low anti-aging performance; and because the selection of equipment in the foundation, cooling and stretching process and the setting of parameters are very important to the production of the product, if the selection or setting is inaccurate, the The probability of product rupture during production will increase and the performance of the produced product will be poor, that is, the scrap rate will also be high, but there is no complete description in the above-mentioned literature; Compatibility reports between film and impregnating agent, model capacitor durability test and aging test reports obtained from authoritative departments cannot fully prove that they can be applied to roughened films for UHV power grid supporting capacitors, which is also a special product. required procedure

Images