Sodium polyacrylate, PAAS

Product Overview

Sodium polyacrylate (also written polyacrylic acid sodium salt, polyacrylate sodium salt, or simply polyacrylate salt) is a high-molecular-weight anionic polymer known for its extreme water-absorption capacity (typically 200–300× its weight for water-swellable grades). It is offered both as a white powder (SAP / super absorbent polymer powder) and as aqueous solutions/liquid dispersions, and is widely used as a thickener, dispersant, water-retaining agent and superabsorbent in multiple industries.

Sodium polyacrylate is a white crystal particles or liquid. Odorless and tasteless. Very hygroscopic. Polymer compounds with hydrophilic and hydrophobic groups. Slowly dissolves in water to form an extremely viscous transparent liquid, its viscosity is about 15-20 times that of CMC and sodium alginate.

Classification by water solubility:
A.   Water-swellable sodium polyacrylate is a kind of highly absorbent resin that we often talk about. It can absorb hundreds to thousands of times its own weight of water. It is non-toxic, harmless and pollution-free. It has strong water absorption capacity and high water retention capacity. The high molecular weight polymer obtained by acrylic acid polymerization → high water retention capacity, balance of absorption under high load, the absorbed water cannot be squeezed out by simple physical methods, and can release and absorb water repeatedly. Applied in agriculture and forestry, it can form a "micro reservoir" at the roots of plants. In addition to absorbing water, highly absorbent resins can also absorb fertilizers and pesticides, and slowly release them to increase fertilizer and drug efficacy.
B.  Water-soluble sodium polyacrylate products are very common in the market, generally mainly solid micro powder type. Water needs to be added for dissolution when used, and the preparation concentration can be adjusted according to demand. Water-soluble sodium polyacrylate has various functions due to its different molecular weight and is widely used in food and other industries. Edible sodium polyacrylate belongs to this category. Edible sodium polyacrylate is a high molecular compound with hydrophilic groups, which slowly dissolves in water to form an extremely viscous transparent solution.

Key Properties & Typical Specifications

Density	1.32 g/mL at 25 °C
Refractive Index	n20/D 1.43
Storage Temp.	2-8°C
Form	Powder
Specific Gravity	1.23
Odor	Odorless
PH	6-9
PH Range	6 - 9
Appearance	Colorless to light yellow Liquid
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