Study on the properties of composite superabsorbent resin doped with starch and cellulose

In order to reduce the damage to soil caused by degradation residues in the application of superabsorbent resin (SAR), the primary target of this study was to improve its biodegradability by doping with starch and cellulose. After that, the water absorption performance of composite SAR doped with starch and cellulose was improved as much as possible by changing the formulation when the biodegradability changed in a narrow range. The degradation percentage in soil and compost after 60 days is much higher than that of the SAR without doping which is 8.42 and 14.17%, but the performance for water absorption depends on the type of starch that was used. Experiments showed that the presence of amylopectin in starch contributes signifi-cantly to the performance for water absorption of composite SAR. The more amylopectin content, the better performance for water absorption, but the specific relationship between the degradability and the amylopectin content has not to be proven. Finally, the best mass ratio of starch, cellulose, and acrylic was 4.2:1.8:65, which was determined via the experiments. A kind of composite SAR doped with starch and cellulose with excellent performance was obtained.