Sodium polyacrylate

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Sodium polyacrylate
Sodium polyacrylate skeletal.png
Sodium polyacrylate.jpg
IUPAC name
poly(sodium prop-2-enoate)
3D model (JSmol)
ECHA InfoCard 100.118.171
Molar mass Variable
Density 1.22 g/cm3
Safety data sheet MSDS
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

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 as much as 200 to 300 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.

The origins of superabsorbent polymer chemistry trace back to the early 1960s when the U.S. Department of Agriculture developed the first super absorbent polymer materials.[1]


Sodium polyacrylate and other derivatives of polyacrylic acid have a wide variety of commercial and industrial uses. These include:

See also[edit]


  1. ^ a b "History of Super Absorbent Polymer Chemistry". M2 Polymer Technologies, Inc. Retrieved 29 April 2009. 
  2. ^ Artificial Snow, M² Polymer Technologies, Inc., retrieved August 29, 2016 
  3. ^ "Superabsorbent polymer (SAP)". 
  4. ^ "Chemical Name: Sodium Polyacrylate". Household Products Database. U.S. Department of Health and Human Services. August 2015. Retrieved August 29, 2016. 
  5. ^ "What are the components of a typical disposable diaper?". Retrieved January 8, 2015. 
  6. ^ "Easy to Get Rid of Horse Manure / Urine Smell". Retrieved 2018-02-02.