from wikipedia
Sodium polyacrylate, also known as waterlock, is a polymer with the chemical formula [-CH2-CH(COONa)-]n widely used in consumer products. It has the ability to absorb as much as 200 to 300 times its mass in water. Acrylate polymer possess an anionic charge neutralized by the sodium cations. The polymer embrace water molecules through hydrogen bonds (the anionic charges along the polymer interact with water hydrogen atoms and cationic sodiums with the water oxygen atoms). It is used for instance in baby nappys/diapers (pañales in spanish).
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