Acrylic Acid - Acrylamide / Organic Intercalation Of Modified Bentonite Super Absorbent Composite Of The Synthesis And Performance

Based on the application requirement of superabsorbent materials and the special structure and properties of bentonite minerals, an organic-intercalated modified bentonite (I-BENT) was prepared by using cetyltrimethylammonium bromide (CTAB) as organic modifier as well as ultrafine smash technique. Using acrylic acid (AA), acrylamide (AM) and I-BENT as primary materials, potassium persulfate (KPS) as initiator, N,N'-methylene-bis-acrylamide (NMBA) as crosslinker, a novel poly(acrylic acid-acrylamide)/I-BENT superabsorbent composite (PAA-AM/I-BENT) with good water absorbency was synthesized by water solution polymerization. The superabsorbent composite was characterized by FTIR, SEM, TG and DSC.The effects of the kind and amount of organic-intercalated modifier, the neutralization degree of acrylic acid, the amount of acrylamide and I-BENT on the XRD patterns of PAA-AM/I-BENT were studied and discussed. When I-BENT modified by 20 wt.% CTAB, the neutralization degree of acrylic acid, the amount of AM was 20 wt.%, 1.0, 20 wt.%, respectively, the silicate interlayer spacing d₀₀₁ value of betonite in PAA-AM/I-BENT was pillared to 3.27 nm.The effects of the amount of bentonite, the neutralization degree of...