Preparation and properties of straw-based water absorbent materials

Abstract

Using corn straw as raw material, the water solution polymerization method was used to synthesize water absorption resin, and analyzed the initiator potassium persulfate dosage, crosslinking agent N-hydroxymethyl acrylamide (MBA) dosage, straw and acrylic acid mass ratio, and temperature of four factors, selected three influential factors for an orthogonal test. The results showed that the optimum single factor preparation conditions were as follows: the mass ratio of acrylic acid to corn stalk was 5, the mass ratio of acrylic acid to acrylamide was 5, the crosslinking agent was 1.0%, the initiator was 1.0%, the reaction temperature was 70°C, the water absorption rate was 17.232 g·g−1 and the water retention rate was 90.96%. The optimum preparation conditions were as follows: mass ratio of acrylic acid to straw was 5, initiator dosage ratio was 1.5%, and the reaction temperature was 70°C. Under these conditions, water absorption was 18.844 g·g−1 and water retention was 97.73%, indicating that the resin had good water absorption and water retention.