Polyacrylic Acid

 

Other name: PAA

CAS No.: 9007-20-9

Molecular formula: C15H17ClO3

Molecular weight: 280.74668

EINECS No.: 618-435-5

Melting point: 95 °C

Boiling point: 116 °C

Density: 1.2 g/mL at 25 °C

Flash point: 100 °C

Storage conditions: 2-8°C

 

Physical and chemical properties:

Low molecular weight polyacrylic acid is a colorless and transparent solid. Its 20%-30% aqueous solution is light yellow or colorless viscous liquid. The molecular weight is 500-5000, and the pH value is 2-4. Its dissociation constant is about 5×10-5, which is similar to that of acetic acid (1.8×10-5), and much larger than the first dissociation constant of carbonic acid. Therefore, polyacrylic acid is a weak acid that is stronger than carbonic acid. It is generally stable to strong acids, strong alkalis, and oxidants, but under high temperature or long-term light, low-molecular-weight polyacrylic acid will still repolymerize, making its molecular weight continue to increase, and its viscosity will also increase, and finally become a jelly state. A solid precipitated from the aqueous solution. It is a chelating agent and a lattice distortion agent, which can form stable complexes with metal ions in water such as calcium and magnesium. It also has good dispersion performance, and can disperse amorphous particles such as crystalline compounds, soil, dust, corrosive substances and biological debris in water.

 

Application: It can be used as thickener, dispersant, flocculant, adhesive and film-forming agent, etc. It is widely used in coatings, plastics, papermaking, textiles, rubber, food, medicine, cosmetics and water treatment industries.

 

 

PIC: Pepper Wang
Email: km12@kmchem.com
WhatsApp/Mobile: +86 15563229915

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