CAS 7758-29-4 ; STPP Sodium Tripolyphosphate ; Pentasodium Phosphate ; Na5P3O10
Chemical name: Pentasodium Phosphate
Molecular formula : Na5P3O10
Molecular weight : 367.86
white powder or powder, apparent density 0.35-0.90g/cm3, melting point 622 degrees Celsius. soluble in water. The aqueous solution is alkaline, and the pH of 1% aqueous solution is 9.7. It is gradually hydrolyzed into phosphite in water and has a good ability to complex metal ions. It can complex with calcium, magnesium, iron and other metal ions to form soluble complexes. Can soften hard water. As an inorganic surfactant, it has the properties of a certain organic surfactant.
Mainly used in synthetic detergents as additives, soap synergists and to prevent the precipitation and blooming of bar soap grease. It has a strong emulsification effect on lubricating oil and fat. It can be used to adjust the pH value of buffer soap, water softener for industrial water, leather pre-tanning agent, dyeing auxiliary, paint, kaolin, magnesium oxide, calcium carbonate and other industries. Used as a dispersant when preparing suspensions, as a dispersant for drilling mud, and as an anti-oil fouling agent in the paper industry.