Polypropylene film

A technology of polypropylene film and polypropylene resin, applied in the direction of film/thick film capacitors, ion implantation plating, coating, etc., can solve the problem of increased electrical breakdown rate of materials, shortened life of film capacitors, and poor heat dissipation of film capacitors Uniformity and other problems, to achieve the effect of reduced life and reduced capacity

Inactive Publication Date: 2020-09-08
孔维恒
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  • Abstract
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Problems solved by technology

[0003] In order to make up for the deficiencies of the existing technology and solve the problem that the film capacitor is easy to increase the electrical breakdown rate due to the self-shrinkage of the material when it is used in a low temperature environment, resulting in a shortened life of the film capacitor and uneven heat dissipation of the film capacitor in the prior art, this paper A polypropylene film proposed by the invention

Method used

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  • Polypropylene film
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preparation example Construction

[0032] The preparation method of described polypropylene film comprises the following steps:

[0033] S1: Pass the polypropylene resin and gum arabic into the high-speed shearing machine, control the speed of the high-speed shearing machine to 800-1000r / min for high-speed shearing and mixing, and pass the mixture together with alumina into the reaction kettle after mixing. Control the temperature in the reaction kettle to rise to 200-260°C, and keep it warm for 10-15 minutes; modify the polypropylene resin with gum arabic, and make use of the high-quality viscosity of gum arabic, so that the prepared polypropylene resin film is stretched The intermolecular bonding strength is strong, which effectively prevents tiny voids from being damaged during the stretching process. At the same time, polypropylene resin and gum arabic are mixed at high speed at room temperature to effectively avoid the high viscosity of gum arabic in its molten state. , which is not conducive to the unifor...

Embodiment approach

[0039] As an embodiment of the present invention, wherein the raw material also includes active manganese dioxide powder;

[0040] The selected active manganese dioxide in the raw material can decompose by itself in a high temperature environment, and then release a large amount of oxygen ions by itself, and when there are defects or defects in the metallized film, the current of the metal layer at the defect or defect increases rapidly, and then in the short-term Within a short period of time, the temperature of the metal layer at the defect or defect will increase rapidly to reach the melting point of the metal film. At this time, the heat will be conducted into the polypropylene film and cause the polypropylene film to self-dissolve, and the active manganese dioxide inside will decompose and release oxygen ions. The aluminum vapor at the melting point is in contact with each other to form an aluminum oxide film. The formation of the aluminum oxide film cuts off the electrica...

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Abstract

The invention belongs to the technical field of high polymer materials, and particularly relates to a polypropylene film which comprises a shell, a core and leading-out lines. The core comprises a substrate layers, metal film layers and a heat conduction layer. The two substrate layers are made of modified polypropylene resin films; the metal film layers are fixedly connected to both sides of thesubstrate layers through evaporation, and the area of the metal film layers is smaller than that of the substrate layers; the heat conduction layer is made of a heat conduction silicone grease material; the surfaces, away from the heat conduction layer, of the metal film layers are coated with an insulating paint layer; the metal film layers on two adjacent substrate layers are in a staggered state; the leading-out wires are respectively conducted with the metal film layers on the two substrate layers; the MAH graft modified polyethylene wax and the active manganese dioxide are added into thepolypropylene film, so that the softness of the prepared polypropylene film is effectively and remarkably enhanced, meanwhile, the active manganese dioxide is self-decomposed to release oxygen ions togenerate an aluminum oxide film, and the service life of a film capacitor is further prolonged.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, in particular to a polypropylene film. Background technique [0002] Polypropylene capacitors use metal foil as an electrode, and after overlapping it with polypropylene film from both ends, it is a capacitor with a cylindrical structure. Since the film capacitor has no polarity, its insulation resistance is high and its frequency characteristics are excellent (frequency response Wide), and the dielectric loss is very small. Based on the above advantages, film capacitors are widely used in analog circuits, especially in the part of signal cross-connection. It is necessary to use capacitors with good frequency characteristics and extremely low dielectric loss. To ensure that there will not be too much distortion when the signal is transmitted, the dielectric constant is high, the volume is small, the capacity is large, and the stability is relatively good. It is suitable for bypass capac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J7/06C08J5/18C08L23/12C08L5/00C08L51/06C08K3/22C23C14/24C23C14/20H01G4/33
CPCC08J5/18C08J7/06C08J2323/12C08J2405/00C08J2451/06C08K2003/2227C08K2003/2262C23C14/20C23C14/24H01G4/33
Inventor 孔维恒杨忠寸
Owner 孔维恒
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