Performance of Water Absorption and Retention Material and Chemical synthesis of Calcium Lignin Sulphonate with Acrylamide and Acrylic Acid

摘要

By graft copolymerization of calcium lignin sulphonate with acrylic acid and acrylamide, high water absorption and retention material was prepared. Effect of process parameters on graft copolymerization and sample properties was investigated by means of the single-factor method, and the microstructure of fracture surface of the water absorbent resin was analyzed by SEM. The result shows that: when mass percents of acrylic, acrylamide, calcium lignin sulphonate and crosslinking agent are 65.5%, 19.5%, 15%and 0.05%, respectively, and neutralization degree is 60% with 2h of initiation reaction time and 1.5h of crosslinking reaction time. The water absorption mean speed of material is up to 6 g·g~(-1)·h~(-1) and the highest water retention rate is up to 96.32%.The water absorption rate of material is up to 820 g/g, and 0.9 wt.% NaCl solution absorption rate is up to 83g/g. The fracture surface of the water absorbent resin shows convexo-concave morphology which has lots of micropores.