Low-voltage low-loss electrolytic capacitor paper and preparation method and application thereof

Abstract

The invention relates to the technical field of aluminum electrolytic capacitor paper new materials, in particular to low-voltage low-loss electrolytic capacitor paper and a preparation method and application thereof. The invention relates to low-voltage low-loss electrolytic capacitor paper, which is prepared from the following fiber raw materials in percentage by mass: 30 to 60 percent of hemp pulp, 20 to 50 percent of tencel pulp and 10 to 50 percent of polyolefin short fiber, the beating degree of the hemp pulp is 15-50 degrees SR; the beating degree of the hemp pulp is 40-70 degrees SR, the beating degree of the tencel pulp is 40-70 degrees SR, the hemp pulp, the tencel pulp and the polyolefin short fibers are uniformly mixed and then fed into a paper machine drifting system, then wet-process papermaking forming is performed to obtain raw paper, and the raw paper is shaped by adopting a shaping drying cylinder to obtain a finished product of the low-voltage and low-loss electrolytic capacitor paper. The product has good absorptivity, relatively low aperture and relatively high strength, the used raw materials are high in purity, the high purity of the electrolytic paper can be effectively ensured, and the risk of aluminum foil corrosion is avoided.

Description

technical field [0001] The invention relates to the technical field of new materials for aluminum electrolytic capacitor paper, in particular to a low-voltage low-loss electrolytic capacitor paper and its preparation method and application. Background technique [0002] Electrolytic capacitors are one of the important components in the electronics industry. In addition to the functions of filtering, decoupling and signal coupling in the circuit, they also play a special role in special circuits such as rectification circuits, power circuits and AC motor starting circuits. Widely used in the automotive industry, security industry, medical electronics, computer TV, electronic toys and industrial control and other fields. [0003] Electrolytic capacitor paper mainly plays the role of isolating positive and negative electrodes and absorbing electrolyte in electrolytic capacitors. According to the requirements of use, it can be divided into high-voltage electrolytic paper and low...

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Problems solved by technology

[0005] For example, Chinese invention patent CN100373002C discloses a low-tightness electrolytic capacitor paper, which uses aramid fiber and biological cellulose fiber as raw materials. Acid chloride is used in the preparation process of aramid fiber, which leads to the chloride ion content of the prepared aramid fiber is much higher than the requirements of electrolytic capacitor paper, and it will corrode aluminum foil during use, which is harmful to capacitors. has a great influence on the service life of

[0006] For example, Chinese invention patent CN108221487B discloses a low internal resistance super electrolytic capacitor paper and its preparation method, which uses Tencel fiber and superfine polyester fiber as raw materials , prepared by wet papermaking process. Tencel fiber is different from conventional plant fiber. When the tencel beating degree is high, the fiber is shorter and the bonding force between fibers is poor. The tencel fiber and ultrafine polyester fiber are mixed for papermaking. It also weakens the bonding force of fibers in the wet paper web, causing the wet paper web to easily stick to the net during the transfer process, forming holes and other paper defects; at the same time, due to the addition of ultra-fine polyester fibers, the fibers are small in diameter and long in length. A high aspect ratio is likely to cause problems such as polyester fiber knotting during flow, forming lumps in paper, etc.

[0007] For example, Chinese invention patent 201811048307.3 discloses a carbon-free solid electrolytic capacitor paper and its preparation method. In this method, wood pulp and chemical fibers are mixed to prepare electrolytic paper. However, this method has a low beating degree of wood pulp and high chemical fiber content, and the strength of the prepared product is low, and the paper aperture is large, which is easy to cause a short circuit in the electrolytic capacitor, and is not suitable for use in low-voltage electrolytic capacitors.

[0008] For example, the Chinese invention patent CN108166320A discloses a method for preparing low-density and high-strength electrolytic capacitor paper by in-machine coating. A mixed solution of polycarboxylic acid and PVA is used to increase the strength of the paper, and the traditional plant fiber is still used for papermaking, and the loss of the prepared electrolytic capacitor paper is still high; in addition, the polycarboxylic acid contained in the coating solution will lead to the loss of the electrolytic capacitor paper. High acid ion content will corrode the aluminum foil of the capacitor and easily cause the capacitor to be broken down

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