Abstract
A novel potassium humate–acrylic acid–acrylamide (KHA–AA–AM) superabsorbent polymer was prepared from the reaction among leonardite potassium humate, acrylic acid and acrylamide by free radical initiating process using ammonium persulfate as the initiator and N, N′-methylene bisacrylamide as the crosslinker. Various effects of synthesis conditions on superabsorbent polymer were studied and the optimal reaction condition was obtained with crosslinker concentration 0.44–0.74 wt%, initiator concentration 1.12–2.22 wt%, n(KOH)/n(AA) 0.51–0.70, monomer concentration 10.95–12.59 wt%, graft reaction temperature 83 ± 1°C, monomer mole ratio of acrylic acid to acrylamide 1.42–2.30, and potassium humate content 17.54 wt%. Under the optimal conditions, the solution absorbency of KHA–AA–AM superabsorbent polymer to deionized water, tap water, 0.5% carbamide solution and 0.9% NaCl solution were 733–756, 161–284, 786–825, and 76–83 g/g, respectively.
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Abbreviations
- KHA–AA–AM:
-
potassium humate–acrylic acid–acrylamide
- KOH:
-
potassium hydroxide
- AA:
-
acrylic acid
- MBA:
-
N, N′-methylene bisacrylamide
- AM:
-
acrylamide
- NaCl:
-
sodium chloride
- APS:
-
ammonium persulfate
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Li, W., Wang, J., Zou, L. et al. Synthesis and characterization of potassium humate–acrylic acid–acrylamide hydrogel. J Polym Res 15, 435–445 (2008). https://doi.org/10.1007/s10965-008-9189-z
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DOI: https://doi.org/10.1007/s10965-008-9189-z