Polyacrylic Acid (PAA) CAS 9003-01-4
Release time: 2025-07-24
Physicochemical properties
| Property | Description |
|---|---|
| Chemical Name | Polyacrylic acid |
| CAS Number | 9003-01-4 |
| Molecular Formula | (C3H4O2)n |
| Molecular Weight | Variable, typically < 10,000 (can range from a few hundred to several million depending on the degree of polymerization) |
| Appearance | White solid (low molecular weight) or colorless to amber viscous liquid (aqueous solution) |
| Density | Approximately 1.09 g/mL (30% aqueous solution); other sources report 1.2 g/mL at 25°C |
| Melting Point | Around 106°C (some sources report 12.5°C or undetermined) |
| Boiling Point | 116°C (at atmospheric pressure); other sources report 502.0 ± 45.0°C at 760 mmHg |
| Viscosity | Highly viscous in aqueous solutions, viscosity increases with molecular weight and concentration |
| Stability | Stable under normal conditions; gradually loses water upon heating, forming an anhydride above 100°C; decomposes slowly above 250°C with the release of carbon dioxide |
Application Areas
Water treatment: As a scale inhibitor and dispersant, it is used in the circulating cooling water system of power plants and chemical plants to prevent scale and corrosion.
Food industry: used as thickener, gel agent and humectant for jelly, ice cream, candy and other products.
Cosmetics: used as stabilizer and humectant of lotion and facial mask.
Paper and Textile: Used as an additive to improve paper strength or enhance textile properties.
Petrochemical industry: used as a corrosion inhibitor, emulsifier, to protect equipment and reduce crude oil viscosity.
Battery field: As a binder for lithium batteries, it enhances battery safety and cycling performance.
Storage conditions
Conventional conditions: Store in a cool, dry, and well ventilated place, away from direct sunlight and high temperatures.
Special requirements:
It needs to be stored separately from acids and bases to prevent chemical reactions.
Solid products require double-layer packaging (inner polyethylene bag+outer woven bag) to prevent moisture.
Liquid products require corrosion-resistant sealed containers and regular inspections of their properties.
Safety precautions
Health protection:
Skin contact: Immediately rinse with clean water for 15 minutes.
Eye contact: Rinse and seek medical attention.
Leakage handling:
Small leakage: Absorb with inert materials and collect in a closed container.
Massive leakage: Wear protective equipment to prevent entry into water bodies.
Firefighting measures:
Extinguishing agent: dry powder, foam or carbon dioxide, avoid direct flowing water.
Firefighters are required to wear respirators and protective clothing.
