Preparation and Property Study on Bentonite /Polyacrylamide Composite Water Absorbent and Retention Material

Bentonite /polyacrylamide composite water absorbent and retention material was prepared by bentonite and polyacrylamide raw materials by method of solution blended process. The prepared samples were analyzed in virtue of XRD、SEM、FT-IR、TG-DSC. The results show that: when the mass ratio of bentonite and polyacrylamide is 8 ∶ 2,the prepared materials' absorbency of salt and water and water retention properties are good,suitable as a water additives for sand-fixing material; polyacrylamide modified bentonite was not change the skeleton-structure of bentonite,just the polyacrylamide intercalated into the interlayer of bentonite, increased the distance of crystal face, and changing the surface roughness; modified bentonite has a higher thermal stability than the original.