一种电容器用多层共挤聚丙烯复合膜及其制备方法
By using an ABA three-layer co-extrusion structure and modified boron nitride, the problems of reduced breakdown electric field strength and insufficient flame retardancy of polypropylene films at high temperatures were solved, achieving a comprehensive improvement in high dielectric strength, high breakdown strength, and flame retardancy.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- 扬州博恒新能源材料科技有限公司
- Filing Date
- 2026-04-15
- Publication Date
- 2026-07-17
AI Technical Summary
Existing polypropylene films suffer from reduced breakdown electric field strength and difficulty in increasing dielectric constant under high-temperature conditions, and their flame retardant properties are insufficient, making it difficult to simultaneously meet the requirements of high dielectric, high breakdown, and flame retardancy.
A multilayer co-extruded polypropylene composite film with an ABA three-layer co-extrusion structure was prepared by mechanically exfoliating and surface modifying boron nitride to prepare BN@SiO2-NH2 flame retardant, which was then premixed with MAH-g-PP to form chemical bonds. Combined with the dispersion of alumina in the B layer, the performance of each layer was optimized.
It achieves improved breakdown strength, dielectric properties, and flame retardancy under high-temperature conditions, avoids agglomeration of functional fillers, and improves limiting oxygen index and interfacial bonding strength.
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