Polyacrylic Acid Sodium, Polyacrylate Sodium


Polyacrylic acid sodium is innoxious. It is soluble in water. Engineers use this sodium salt in alkaline and high-concentration situations without scale sediment. In other words, the sodium polyacrylate polymer can disperse the microcrystals or micro sand of calcium carbonate, calcium phosphate, and calcium sulfate.

People use polyacrylate sodium as a scale inhibition and dispersant, most in circulating cool water systems, papermaking, weaving, dyeing, ceramics, painting, etc.

People also use sodium polyacrylate as a water lock. As we all know, it is a sodium salt of polyacrylic acid. The polyacrylate sodium has [-CH2-CH(CO2Na)-]n. The polyacrylic sodium salt is widely used in consumer products. This super-absorbent polymer can absorb 100 to 1,000 times its mass in water.

Sodium polyacrylate is a cathode polyelectrolyte. It has a negatively charged carboxyl group in its main chain. Engineers neutralize polyacrylic acid to get this sodium salt. This sodium polyacrylate polymer is used widely in industry. In addition, there are other kinds of salt of polyacrylic acid, like potassium, lithium, and ammonium.

The origins of super absorbent polymer chemistry date back to the 1960s. The U.S. Department of Agriculture developed the first superabsorbent polymer material.

You can click here to get the sodium polyacrylate MSDS sheet.

CAS No.:


Structure Formula:

Polyacrylic Acid Sodium


AppearanceColorless or light yellow transparent liquid
Solid content, %50 Min.
Free monomer (CH2=CH-COOH), %1.0 Max.
Density (20℃), g/cm31.20 Min.
pH (1% solution)6.0~8.0

Note: IRO supplys 40%-45% of sodium polyacrylate products.


Polyacrylate sodium can be used as a scale inhibitor and dispersant in circulating cool water systems in power plants, iron & steel factories, chemical fertilizer plants, refineries, and air conditioning systems. Dosage should be by water quality and equipment materials.

When sodium polyacrylic acid is used alone, 2~15 mg/L is preferred. However, when you use this salt as a dispersant, the experiment should determine the dosage.


People widely use polyacrylic acid sodium and its other derivatives in commercial and industrial applications.

1. People use it for animals. Such as pet mats, absorb horse urine, and raise insects.

2. People use it for health care. Such as paper pads (baby, children, and adults), feminine sanitary napkins, maternity care pads, medical bandages, wound dressings, etc.

3. People use it in the industry, such as waste control, drilling fluid, corrosion inhibitor, concrete protection, etc.

4. People use it for the environment, such as flood prevention packages and collection of excrement.

5. Other products include wire and cable water blocking, artificial snow, hot/cold gel pack, urine bag, thickener, perfume carriers, flame retardant gels, anti-fog packaging material, and water beds.

Packing and storage:

200L plastic drum, IBC(1000L), customers’ requirements.

200L plastic drum 1000L IBC

Storage for ten months in a shady room and dry place.

Safety Protection:

Acidity, avoid contact with eyes and skin. Once contacted, flush with water.


ACRYLIC ACID SODIUM SALT POLYMER, Poly(acrylic acid, sodium salt) solution, Sodium Polyacrylate, Low molecular sodium polyacrylate dispersing agent, PAAS, Poly(acrylic acid, sodium salt)2-Propenoic acid.

Related Product:

polyacrylic acid

Frequency Asked Questions:

Is the reaction between polyacrylic acid sodium and water physical or chemical?

It should be a physical change, the chemical structure of polyacrylate sodium itself does not change after dissolving in water.

What is the mechanism of water absorption of polyacrylate sodium?

Structurally, polyacrylate sodium is a lightly cross-linked polymeric spatial network. It has many dissociated groups (-COONa+). Its network structure comprises chemical and physical cross-linking by an intertwining macromolecular chain.

When the polymer encounters water, the dissociation groups (-COONa+) immediately dissociate into positively charged low molecular ions (Na+) and negatively charged high molecular ions. The low molecular ion (Na+) moves in contact with water and leaves the polymer ion chain. Due to the negatively charged polymer ions asking for a mutual electrical repulsive force, the polymer network bundle by mutual entanglement state gradually stretches (or dissolution) open. This results in osmotic pressure inside and outside the network structure. Water molecules diffuse into the network structure by osmosis and form sols. Therefore, sodium polyacrylate has strong water absorption.