Sodium polyacrylate, also known as waterlock, is a sodium salt of polyacrylic acid with the chemical formula [−CH2−CH(CO2Na)−]n and broad application in consumer products. This superabsorbent polymer has the ability to absorb 100 to 1000 times its mass in water. Sodium polyacrylate is an anionic polyelectrolyte with negatively charged carboxylic groups in the main chain. While sodium neutralized polyacrylic acids are the most common form used in industry, there are also other salts available including potassium, lithium and ammonium.
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Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Safety for humansEdit
As a leftover of producing sodium polyacrylate, acrylic acid would cause a rash when contacts with skin. It should be less than 300 PPM as the absorbent material in paper diaper.
- "Diapers Ingredients". www.kimberly-clark.com. Retrieved 2019-10-08.