Preparation and characterization of aluminum stearate

Abstract

Preparation of aluminum stearate by the precipitation method was examined under various conditions of stearic acid saponification with sodium hydroxide. It was proved that the most favorable ratio of acid/alkali was 1:1.5 and that the obtained soap was very similar to the commercial product. Endothermic effects determined by differential scanning calorimetry and also the other parameters showed that the soaps consisted mono-, di-, tristearates and non-reacted substances, where distearate was the dominant form.U radu je ispitano dobijanje aluminijum stearata postupkom talozenja pri razlicitim uslovima saponifikacije stearinske kiseline natrijum-hidroksidom. Dokazano je da je najpovoljniji molarni odnos kiselina/baza 1:1.5 i da je dobijeni sapun veoma slican komercijalnom proizvodu. Endotermni efekti odredjeni diferencijalnom skenirajucom kalorimetrijom, kao i drugi parametri, pokazali su da su proizvedeni sapuni smese, gde je distearat dominantan oblik.