Polypropylene composite material, polypropylene composite film and preparation method thereof

By combining polypropylene with organic nucleating agents and antioxidants, the microstructure and interfacial compatibility are improved, solving the problems of low energy storage density and poor high-temperature resistance of polypropylene films, and realizing polypropylene composite films with high electrical performance and long-term high-temperature cycling stability.

CN122325890APending Publication Date: 2026-07-03ELECTRIC POWER RES INST CHINA SOUTHERN POWER GRID CO LTD +1
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Patent Information

Application Number
CN202610656727.8
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-05-13
Publication Date
2026-07-03

AI Technical Summary

Technical Problem

Existing polypropylene films have low energy storage density and poor high-temperature resistance, resulting in insufficient long-term stable cycling performance, which limits their application in high-energy storage pulse devices, new energy vehicles, aerospace and other scenarios.

Method used

Polypropylene composite films were prepared by compounding polypropylene with organic nucleating agents and antioxidants, followed by ultrasonic exfoliation, melt blending and annealing. This process improved the microstructure and interfacial compatibility, and enhanced the crystallinity and dielectric properties.

Benefits of technology

It significantly improves the breakdown field strength and energy storage density of polypropylene composite films, maintains excellent long-term cycling stability at high temperatures, and is suitable for high energy storage density and high-temperature long-term cycling scenarios.

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Abstract

The invention relates to the technical field of high polymer materials, and particularly discloses a polypropylene composite material, a polypropylene composite film and a preparation method thereof. The invention provides a polypropylene composite material, which comprises polypropylene, 1, 3: 2, 4-di-p-methylbenzylidene sorbitol and other assistants, the 1, 3: 2, 4-di-p-methylbenzylidene sorbitol is used as an organic nucleating agent, can effectively regulate and improve the microcosmic aggregation state structure of the polypropylene, significantly improves the crystallinity of the polypropylene, and improves the mechanical properties of the polypropylene. According to the invention, the density defect of the prepared polypropylene film is reduced, a reliable material basis is provided for preparing a polypropylene composite film with high electrical insulation performance, excellent high temperature resistance and high-temperature long-term cycle stability, and the problem of insufficient long-term stable cycle performance caused by low energy storage density and poor high temperature resistance of the existing polypropylene film is solved.
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