Preparation of Super-Absorbents Composites from Kaolin/Sodium Lignosulfonate-g-AA-AM
Kaolin/sodium lignosulfonate graft acrylic acid and acrylamide superabsorbents composites ( LPAAM ) were prepared by solution polymerization using sodium lignosulfonate( LS-Na) , acrylic acid(AA) and acrylamide( AM) as raw materials, kaolin as inorganic filler, potassium peroxydisulfate ( KPS ) as initiator, N, N ' -methylene-bis-aaylamide (NMBA)as crosslinker. The optimized formula using orthogonal experiment design based on the assessment of the absorbencies in distilled water and 0. 9% NaCl solution was obtained as follows; m( AM) ; m( AA) = 1: 1, m( KPS) = 1.0% , m(NMBA) =0. 1% , pH =3. Then the saponification reaction based on the above-mentioned optimized formula superabsorbent was used with different concentration NaOH solution at 90 ℃ for 2 h. Its absorbencies in distilled water and 0. 9% NaCl aqueous solution were respectively 1 003 and 89 g· g -1.
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