Modified Polyphosphates with High Hydrolytic Stability

Sodium polymetaphosphate (Graham’s salt) is a hydrolytically unstable compound; when stored in relatively humid warehouses, the reagent quickly ages, which is manifested in the loss of its consumer properties, including the rate of dissolution in water and the ability to form micelles. To improve hydrolytic stability, Graham’s salt was modified with 4,5-dihydroxy-1,3-bis(hydroxymethyl)imidazolidinone. Depending on the molar ratios of Graham’s salt and modifier, oligomers with different functional groups were obtained. Depending on the molar ratios of Graham’s salt and modifier, oligomers with different terminal functional groups were obtained. It was found that oligomers containing terminal methylol groups are characterized by high hydrolytic stability. They dissolve well in water and promote foaming. The average molecular weights of the obtained oligomers were determined.