Amplification Of Preparation Of Starch-Based Superabsorbent By Inverse Suspension Graft Copolymerization And Feasibility Analysis

Starch-based superabsorbent is a kind of super absorbent and water retention ability functional polymer materials. It has a great advantage of biodegradation compared with the synthesized superabsorbent resin. In this paper, cassava starch was used as row materials to prepare salt-tolerance starch-based superabsorbent by inverse suspension graft copolymerization with acrylic acid and acrylamide monomers. Pilot production was carried out based on the experimental data of progressively amplification. Factors affecting the reaction stability and liquids absorption level of resin were adjusted to get the optimal technological conditions. And the feasibility analysis on the industrialization process was also investigated. The research contents and results are as follows:(1) With AA and AM as monomers, the synthesis conditions of salt-tolerance starch-based superabsorbent resin were:the mass ratio of AA and AM was4, neutralization degree of AA was80%, initiator KPS and crosslinking agent MBA were5.4wt.%and0.028wt.%of the total monomers, respectively. Volume ratio of cyclohexane and water was2:1, dispersing agents(Span80:Tween80=3:1in mass) were8.8wt.%of the total monomers. When stirring rate of the polymerization reaction was220rpm, resin’s absorption of deionized water was1280g·g-1, and0.9%NaCl solution was88g·g-1. (2) Pilot production was carried out based on the experimental results of progressively amplification. Amount of crosslinking agent was adjusted to0.032wt.%of the total monomers. Quaternary compound dispersant was determined as Tween80:Span80:PEG-4000:PDMS=1:4:12:10. When stirring speed was50～80rpm, the reaction system is stable and resins were tested all up to the standards. Absorption of deionized water and0.9wt.%NaCl solution were1064g-g-1and86g-g-1respectively.(3) Feasibility analysis on preparation of salt-tolerance starch-based superabsorbent by inverse suspension graft copolymerization was investigated with pilot data and current situation of market as references. Product of the technical indicators and routings were in line with the feasibility requirements.