INFLUENCE OF EMULSIFIERS USED FOR THE PREPARATION OF STYRENE-ACRYLIC EMULSION ON AIR PERMEABILITY AND WATER RESISTANCE OF AUTOMOBILE FILTER PAPER

摘要

As one category of specialty paper grades, automobile filter paper is widely used as the filtering material for automobile filter, and it is usually manufactured via a resin-impregnation process. In recent years, the improvement of the performance of automobile filter paper has been widely concerned. In this work, using styrene, acrylic ester, acrylic acid, and N-methylolacrylamide as the base materials, a series of styrene-acrylic emulsions were prepared via the preemulsification and semicontinuous copolymerization method. The emulsions were subsequently used for the preparation of emulsion- impregnated automobile filter papers (emulsion dosage of 20%, drying temperature of 140 , and drying time °C of 6 min), and the influence of emulsifiers on air permeability and water resistance was investigated. The use of emulsifiers decreased air permeability by 6-11%. When the emulsifiers including OP-10/SDS, OR-2/S-100, and OR-2/CO-436 were used, air permeability was maintained by more than 94% (in comparison to the base paper). When the emulsifiers including OP-10/S-100, OP-10/CO-436, OR-2/FR-1, OR-2/RS-610,S-201/FR-1,S-201/OF-40,S-201/RS-610 ,FOR-3/S-100,FOR-3/COPS-1 and FOR-3/OF-40 were used, air permeability was maintained by more than 90% (in comparison to the base paper). The emulsifiers including OP-10/FR-1, OR-2/FR-1, and FOR-3/OF-40 were capable of achieving very high water resistance, i.e., above 240 min. The emu * lsifiers including OR-2/COPS-1 and FOR-3/RE-610 gave relatively good water resistance values of 30-50min. Also, when OP-10/SR-10,OR-2/SR-10,S-201/FR-1,FOR-3/COPS- 1, and FOR-3/RE-610 were used, and water resistance was maintained at 10-30min. On balance, the emulsifiers capable of maintaining both good air permeability (>90%) and good water resistance were OR-2/FR-1, FOR-3/OF-40, S-201/FR-1, and FOR-3/COPS-1. By optimising the use of emulsifiers, the control in air permeability and water resistance of automobile paper is presumably possible.