Abstract:

In order to improve the water absorption, salt resistance and gel strength after repeating absorbing of superabsorbent resin(SAR), a novel SAR was prepared by the solution polymerization of pretreatment wheat straw (WS), modified bentonite, acrylic acid (AA) and acrylamide (AM). The dosage of cross-linking agent and initator, mass ratio of monomer, neutralization degree of AA, the dosage of WS and modified bentonite were investigated, which could influence the water absorption capacity of SAR. FT-IR was conducted to characterize the structure of WS and SAR. The result was obtained as follows: the best water absorption capacity of SAR was 195.7g?g-1 in distilled water and 24.2g?g-1 in 0.9 wt ％ NaCl solution, respectively. Compared with the SAR without adding the modified bentonite, the SAR containing modified bentonite was much better in water absorption, repeating absorption and gel strength after repeating absorbing.

Key words: wheat straw, modified bentonite, superabsorbent, absorbency