Polyacrylate Sodium


CAS No 9003-04-7

Structural Formula:

PAAS is innoxious and soluble in water, it can be used in situations of alkaline and high concentration without scale sediment. 
PAAS can disperse the microcrystals or microsand of calcium carbonate, calcium phosphate and calcium sulfate. 
PAAS is used as scale inhibition and dispersant for circulating cool water system, papermaking, weave, dyeing, ceramic, painting, etc.

Sodium polyacrylate can absorb solutions quickly by swelling porous structure networks to reduce mass-transfer resistance. 
Also, sodium polyacrylate is a low-cost, non-toxic, and biocompatible option for water purification to recover metal ions.

Sodium polyacrylate has a high performance; very versatile 30% sodium polyacrylate based treatment product scientifically formulated for use in a wide range of manufacturing and industrial process applications. It is available in a neutralised form and has a molecular weight of 2000.

Sodium polyacrylate has many applications, for example, it can be used as a suspended solids inhibitor for both boiler water and cooling water systems.

Sodium polyacrylate can also be blended with a wide range of other chemicals to produce a multifunctional water treatment chemical.

Sodium polyacrylate can be used as a slurry enhancer for metal carbonates e.g. CaCO3, MgOH etc.

Sodium polyacrylate can also be used as a sugar evaporator scale inhibitor, a cement super plasticiser etc.

Sodium polyacrylate is a very versatile process additive.

Product Benefits
High quality sodium polyacrylate based product
Highly versatile process additive, can be used for many applications


Colorless to light yellow transparent liquid

Solid content %: 50min
Free monomer (CH2=CH-COOH) %: 1.0max
Density (20℃)g/cm3: 1.20min
pH(as it): 6.0~8.0

40%, 45% are also supplied 

PAAS can be used as 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 in accordance with water quality and equipment materials. 
When used alone, 2-15mg/L is preferred. When used as dispersant, the dosage should be determined by experiment.

Package and Storage:
25kg or 200kg in plastic barrel. Storage for ten months in room shady and dry place.

Sodium polyacrylate is an anionic polyelectrolyte with negatively charged carboxylic groups in the main chain. 
Sodium polyacrylate is a chemical polymer made up of chains of acrylate compounds. 
It contains sodium, which gives it the ability to absorb large amounts of water. 
Sodium polyacrylate is also classified as an anionic polyelectrolyte

Sequestering Agents
Sodium polyacrylate is commonly used in detergents as a chelating agent.
A chelating agent is used in detergents because it has the ability to neutralize heavy metals that can be found in dirt, water, and other substances that could be in clothes. 
The addition of sodium polyacrylate makes detergent more effective when cleaning clothes.

Thickening Agents
Since sodium polyacrylate can absorb and retain water molecules, it is used often in diapers, hair gels, and soaps.
Sodium polyacrylate is considered a thickening agent because it increases the viscosity of water-based compounds. 
In diapers, sodium polyacrylate absorbs water found in urine in order to increase the capacity to store liquid and to reduce rashes.

Sodium polyacrylate can also be utilized as a coating for electrical wires in order to reduce the amount of moisture around wires.
Water and moisture near wires can cause issues with transmitting electrical signals. This could cause potential fire hazards. 
Due to the effective absorption and swelling capacity of sodium polyacrylate, it can absorb water and prevent it from surrounding or infiltrating wires.

In the agricultural industry, sodium polyacrylate is used to help plants retain moisture in the soil.
It can act as a water reservoir for plants and is commonly used by florists to keep flowers fresh. 
Furthermore, the use of sodium polyacrylate for growing domestic fruit and vegetables has been approved by the U.S. Department of Agriculture.



2-Propenoic acid, sodium salt

sodium prop-2-enoate

Sodium polyacrylate


Acrysol lmw-45N

Sodium 2-propenoate


Rhotex GS


Hiviswako 105

Sodium poly acrylate

Polyacrylate sodium salt

Acrylic acid, sodium salt


Sodium polyacrylate 4500

Sodium polyacrylate solution

2-Propenoic acid, sodium salt (1:1)

Polyacrylic acid, sodium salt


CCRIS 3235

Poly(acrylic acid), sodium salt

Acrylic acid polymer, sodium salt


Acrylic acid, polymers, sodium salt

Propenoic acid, sodium carbonate polymer


2-Propenoic acid, sodium salt, homopolymer

HSDB 6087

Sodium 2-propenoate, homopolymer

polyacrylate sodium

2-Propenoic acid, sodium salt (1:1), homopolymer

EINECS 231-209-7



Polyacrylc acd sodum salt



Sodium polyacrylate; PAAS


EC 231-209-7




2-propenoic acid sodium salt











Poly(acrylic acid sodium salt) powder









Poly(acrylic acid sodium salt) Powder Mw~5000

Poly(acrylic acid sodium salt)50 wt. % in H2O



2-Propenoic acid sodium salt; Acrylic acid sodium salt

Poly(acrylic acid sodium salt) average 30 wt. % in H2O

Sodium polyacrylate is the sodium salt of polyarylic acid. As a chemical polymer, it has various kinds of application in consumer products. 
It is capable of absorbing extremely high amount of water which can reach up to as much as 200 to 300 times its mass; therefore, it is used in agriculture industry and is infused in the soil of many plants to maintain the moisture of plant. 
It can be commonly used as a sequestering agent, or chelating agent in many detergents. 
It can also be used as a thickening agent to be used in diapers and hair gels because of its high capability of absorbing and holding water. Furthermore, it can be included in the coatings of sensitive electrical wiring to remove moisture in the wires.

Sodium polyacrylate is a commonly used dispersant, also known as 2-sodium acrylate homopolymer, S sodium polyacrylate. 
It is colorless or light yellow viscous liquid in room temperature, and non-toxic, alkaline, insoluble in organic solvents such as ethanol, acetone but easily soluble in water and aqueous sodium hydroxide. 
However, for aqueous solution of calcium hydroxide, magnesium hydroxide, due to the increase of alkaline metal ions, it is first dissolved and then precipitated. 
It can work without entrustment under alkaline conditions or being concentrated for several folds with molecular weight of about 500-3000. 
It can disperse the microcrystalline or sediment of calcium carbonate, calcium sulfate salts into the water without precipitation, and thus achieving the purpose of preventing entrustment. 
Besides used as the descaling dispersant in power plants, chemical plants, fertilizer plants, refineries and air conditioning systems, cooling water system, it is also widely used in industries like paper and textile, ceramics, paints, building materials. 
When used as a paper coating dispersant, it has a relative molecular mass in 2000-4000. 
When coating concentration is 65% to 70%, it can still have a good rheology and aging stability. 
The product in molecular weight from 1000 to 3000 is used as water quality stabilizer as well as scaling control agent of concentrated black liquor. 
Products with molecular weight higher than 100,000 is used as coatings thickener and water retention agent, which can increase the viscosity of synthetic emulsion such as carboxylated styrene-butadiene latex and acrylate emulsion latex and prevent the water from being separated out as well as maintain the stability of the coating system . 
Product of molecular weight of 1 million or more can be used as a flocculant. 
It can also be used as super absorbent polymer, soil conditioners, as well as a thickening agent and emulsion dispersant in the food industry.
The molecular structure of sodium polyacrylate molecule is water soluble linear polymers. 
Small molecular weight molecule is as liquid with large molecule counterparts shown as solid. 
Solid product is shown as a white powder or granules, and is odorless, water-swellable, and soluble in aqueous caustic soda. 
Moreover, it is extremely hygroscopic. 
It is a polymer compound containing hydrophilic and hydrophobic groups. 
It is slowly soluble in water and form a highly viscous transparent liquid whose 0.5% solution having a viscosity of about 1000cp with the viscosity being not as swelling as CMC and sodium alginate. 
But owing to the ion phenomenon of many anionic groups in the molecule makes the molecular chain being longer, increasing the apparent viscosity to form highly viscous solution. 
It has a viscosity which is 15-20 times as high as sodium carboxymethyl cellulose (CMC) and sodium alginate. 
It has a high alkali resistance with viscosity changing only little and it is also non-perishable. 
Heat treatment, neutral salts, and organic acids have very small effects on its viscosity. 
However, it has increased viscosity upon alkaline condition. 
Intense heating to 300 degrees will not cause decomposition of it. 
Due to its property as a kind of electrolyte, it is vulnerable to acids and metal ions which cause the decrease of viscosity. 
In case of more than a sufficient amount of divalent metal ions (e.g. aluminum, lead, iron, calcium, magnesium, zinc), it will form insoluble salt which cause intermolecular crosslink and thus gelation and further precipitation. 
But it is still as solution upon a low amount of divalent metal ion, making it be able to be used as detergent additives which play a role in preventing soil re-deposition.

1. It can be used as a corrosion scale inhibitor, water stabilizer, paint thickener and water retention agent, flocculants, drilling mud treatment agent.
2. The agent is used for the circulating cooling water treatment for equipment copper material with a excellent scale effect. 
At the amount of 100 mg/L, it can form chelate with the scale-forming ions in water of medium hardness and further flow with water, and can prevent the formation of iron oxide scale.
3. It can be used as a thickener and stabilizer.It can also be used as surface freezing glue for freezing products and aquatic products, and can also play a role in preservation. 
4. Thickener
5. It can be used as a filtrate reducer in solid drilling industry.
6. This product is a good anion detergent and dispersants which can be combined with other water treatment agent compound used for oil field water, cooling water, boiler water treatment at high pH and at high concentration process without scaling.

Production methods
1. Add deionized water and 34 kg of isopropanol chain transfer agent to the kettle separately and heat it to 80~82 °C. Add drop wise 14 kg of ammonium per-sulfate aqueous solution and 170 kg of acrylic monomers. After completion of dropping, perform the reaction for 3 h; cool to 40 °C; add 30% aqueous NaOH solution to a pH value of 8.0 to 9.0 and then have water and isopropanol been distilled to get the final liquid products. Spray dry to give a solid product.
2. Acrylate or acrylic acid is reacted with sodium hydroxide to get sodium acrylate, remove the alcohol by-produced; concentrate; adjust the pH, and undergo polymerization reaction to get the final product with the catalysis of ammonium per-sulfate.
3. Acrylic acid and sodium hydroxide is reacted to get sodium acrylate monomer, and then polymerize into sodium polyacrylate with ammonium per-sulfate as the catalyst.
4. Add sodium polyacrylate (with molecule weight: 1000~3000) to the reaction vessel to obtain 30% aqueous solution.

Sodium polyacrylate, also known as waterlock, is a sodium salt of poly acrylic acid with the chemical formula [-CH2-CH(COONa)-]n and broad application in consumer products. It has the ability to absorb as much as 200 to 300 times its mass in water. Sodium polyacrylate is anionic polyelectrolytes with negatively charged carboxylic groups in the main chain. While sodium neutralized poly acrylic acids are the most common form used in industry, there are also other salts available including potassium, lithium and ammonium.

Chemical Properties
faintly grey crystalline solid

Scale inhibitor, builder in detergents, aid in soap and detergent processing and control of water hardness.

sodium polyacrylate is a suspending agent, stabilizer, and emulsifier.

Sodium poly acrylate and other derivatives of polyacrylic acid have a wide variety of commercial and industrial uses that include:
Sequestering agents in detergents. ( By binding hard water elements such as calcium and magnesium, the surfactants in detergents work more efficiently.).

ChEBI: An organic sodium salt which is a macromolecule composed of repeating sodium acrylate units.

Safety Profile
An eye irritant. When heated to decomposition it emits toxic fumes of Na2O.

Purification Methods
Commercial polyacrylamide is first neutralised with an aqueous solution of NaOH, and the polymer is precipitated with acetone. The precipitate is redissolved in a small amount of water and freeze-dried. The polymer is then repeatedly washed with EtOH and water to remove traces of low-molecular-weight material, and finally dried in vacuum at 60o [Vink J Chem Soc, Faraday Trans 1 75 1207 1979]. It has also been dialysed overnight against distilled water, then freeze-dried. Sodium poly( -L-glutamate). Wash it with acetone, dry it in a vacuum, dissolve it in water and precipitate it with isopropanol at 5o. Impurities and low-molecular-weight fractions are removed by dialysis of the aqueous solution for 50hours, followed by ultrafiltration

Sodium polyacrylate (also called acrylic sodium salt polymer) is a superabsorbent polymer that is used extensively in commercial applications as a water absorbent. 
It is a white, granular, odorless solid that is not considered hazardous. Sodium polyacrylate is made when a mixture of acrylic acid and sodium acrylate is polymerized.

Industrial Uses
Sodium polyacrylate is used as a thickening agent in industrial processes and to dissolve soaps. 
A thickener increases the viscosity of hydro-based systems, increases its stability, and provides body without modifying its other properties. 
Sodium polyacrylate behaves as a wetting and dispersing agent, promoting miscibility and facilitating even dispersion. 
Sodium polyacrylate acts as a sequestering (or chelating) agent in many detergents. 
It acts by combining with dissolved substances in water and binding them together, allowing detergent surfactants (wetting agents) to act effectively.

Agricultural Uses
Sodium polyacrylate is added to potted plants and soils to allow them to retain moisture. 
It behaves as a water reservoir, soaking up excess water and discharging it when required. 
Florists use sodium polyacrylate to preserve water and help retain the freshness of flowers.

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Baby and Feminine Products
Diapers are made absorbent by the addition of a thin membrane of sodium polyacrylate. 
The outermost layer of a diaper is made of microporous polyethylene, and the innermost layer is polypropylene. Polyethylene keeps the urine from leaking, and polypropylene absorbs moisture from the skin and allows the diaper to keep dry and soft. Between these two layers is a layer of sodium polyacrylate in combination with cellulose. According to “Chemistry & Chemical Reactivity, Volume 2,” sodium polyacrylate can easily absorb up to 800 times its weight in water. Sodium polyacrylate is also used in tampons and similar female hygiene products.

Medical Uses
Sodium polyacrylate is used in surgical sponges that wipe away harmful spills.

Sodium polyacrylate is added to gas containers (jet fuel, diesel, and gasoline) to absorb water. 
It is used in filtration units that separate water from automobile and airplane fuel, increasing the efficiency of the vehicle.

Sodium polyacrylate protects electrical and optical cables from moisture. 
It is applied to the conductor or shielding of communication and power cables. Sodium polyacrylate blocks water from penetrating and damaging a cable.

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