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Chemcial Industry and Engineering 2024, Vol. 41 Issue (1) :103-110    DOI: 10.13353/j.issn.1004.9533.20220373
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Deashing technology of high purity polypropylene for electrical film
ZHOU Changhao1, XING Zhaoliang2, JIANG Tao1, LI Jian1
1. College of Chemical Engineering and Materials Science, Tianjin University of Science & Technology, Tianjin 300457, China;
2. State Key Laboratory of Advanced Power Transmission Technology(Global Energy Interconnection Research Institute Co., Ltd.), Beijing 102200, China

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Abstract It is of great significance for China’s BOPP film industry and even the whole power capacitor industry to develop the ultra-low ash polypropylene material and break through the "Strangle" technology abroad. In this study, a "hexane+ethyl acetoacetate" two-component composite washing solvent system was designed, and the polypropylene resin with low ash content was subjected to deep washing and deashing treatment, the content of Ti, Mg and Al in PP was further reduced, and the ash removal rate of PP powder was over 70%, which was lower than 20 μg·g-1. The influence of detergent types, washing time, washing temperature and washing ratio were studied, and the physical and chemical properties and electrical properties of polypropylene were characterized. The results showed that the film breakdown strength increased from 562.3 to 632.8 kV·mm-1 and the conductivity decreased from 2.0×10-11 to 1.0×10-11 S·m-1 before and after washing.
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ZHOU Changhao
XING Zhaoliang
JIANG Tao
LI Jian
Keywordspolypropylene   resin   ash   BOPP film   capacitor   dewashing     
Received 2022-08-03;
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ZHOU Changhao, XING Zhaoliang, JIANG Tao, LI Jian.Deashing technology of high purity polypropylene for electrical film[J]  Chemcial Industry and Engineering, 2024,V41(1): 103-110
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