METHOD FOR PREPARING NANOMETER COMPOSITE HIGHLY-ABSORPTIVE CHROME TANNING ADDITIVE BY COMBINING POLYCARBOXYLIC COPOLYMER AND MONTMORILLONITE

摘要

A method for preparing a nanometer composite highly-absorptive chrome tanning additive by combining polycarboxylic copolymer and montmorillonite. The method comprises: dispersing 2-10 g of nanometer montmorillonite with 150-400 g of distilled water, adding 0.5-1.5g of cetyl trimethyl ammonium chloride, and enabling the reaction thereof for 4-6 h at a temperature between 60°C and 95°C, performing ultrasonic processing for 0.5-2 h to obtain modified montmorillonite; dispersing 2-10 g of modified montmorillonite using 150-300 g of water for 2-5 h, adding 15-30 g of methacrylic acid, reacting for 0.5-2 h, performing water bath heating, and at 50-80°C, continuing dripping methacrylic acid and an initiator for 30 min, reacting at a constant temperature for 1-3 h, cooling, discharging, and producing the final product. In the method, a pickling procedure in the conventional chrome tanning process is omitted, so that the exhaustion rate of chrome tanning waste liquid is increased, and an environmentally friendly nanometer composite material is therefore provided.