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The filtering efficiency can be remarkably improved only by adding 0.05-0.1% organic-fluorine electret powder TF11 in the melt-blowing cloth, to extend the storage time of electric charge. Electret masterbatch can be obtained through compounding of TF11 and the melting index PP. The dosage into masterbatch is 5-10% and organic-fluorine electret powder can be added directly during production of those with a melting index of 1,500 through masterbatch.
