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 deash-ing 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 elec-trical 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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