High-resistivity polypropylene composite film material, preparation method thereof and dielectric film

• Main Authors: PENG YONGLAI, HSIEH YI-FAN, DENG YUFANG, FU QIANG, YAO CHENG, HU SHANGMAO, LIU HAO, MENG SEN, WANG XING, LIAO MINCHUAN, ZHOU WEIZHEN, ZHAO YINSHAN, LI QIANG, HU TAISHAN
• Format: Patent
• Language: Chinese; English
• Published: 27.02.2024
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; BASIC ELECTRIC ELEMENTS; CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES ORLIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE; CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; ELECTRICITY; GENERAL PROCESSES OF COMPOUNDING; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES ASCOMPOUNDING INGREDIENTS; WORKING-UP

The invention relates to the field of power capacitors, in particular to a high-resistivity polypropylene composite film material, a preparation method thereof and a dielectric film. The preparation method provided by the invention comprises the following steps: S1) carrying out reaction on amino modified aluminum oxide and maleic anhydride grafted isotactic polypropylene; and S2) blending the amino-modified aluminum oxide, isotactic polypropylene and a product obtained after the reaction in the step S1), and drying to obtain the high-resistivity polypropylene nano composite membrane material. According to the invention, the aluminum oxide nanoparticles with moderate dielectric constant are functionalized on the isotatic polypropylene grafted maleic anhydride layer and are used as a filler of the nano composite material, so that high resistivity is realized, and meanwhile, the breakdown performance is also improved. The preparation method disclosed by the invention is simple and economical, and after the obta