Method for judging ionic strength of cationic film

The method comprises the following steps: 1) weighing dye HE-3B in a beaker, diluting the dye HE-3B with a small amount of deionized water, transferring the diluted dye HE-3B into a volumetric flask, washing the beaker, adding water to a constant volume, and completely dissolving the dye HE-3B to obtain a 1% dye solution; transferring 12.5 mL of the prepared 1% dye liquor into a 250mL volumetric flask by using a transfer pipette, and adding water to a constant volume to prepare 0.05% mother liquor; (3) performing sufficient moisture regaining on the fabric subjected to padding finishing, cutting out 5g of the sample according to each formula, marking the sample by using a special yellow oily marking pen, and adding a blank cloth sample for comparison; (4) further diluting the dye liquid in a proper volumetric flask, and then performing coloring test, and (5) judging the ionic strength of the soft sheet according to the staining condition of the white fabric: the lighter the staining is, the weaker the cationi