Obtaining and Studying the Properties of Highly Substituted Cross-Linking with Sodium Trimetaphosphate Cationic Starches of Various Botanical Origins

Abstract

Regularities have been investigated and a method has been developed for one-stage cationization and cross-linking of potato and corn starches using sodium trimetaphosphate as a cross-linking agent. It was found that the obtained crosslinked cationic starches retain their granular structure, and the degree of crystallinity of the samples, regardless of the temperature (20–45 °C), reaction time (24–96 h), and the dose of the crosslinking agent (0,05–5,0%), is greatly reduced, insignifi cantly. It was shown that in a one-stage process, the effi ciency of the starch phosphorylation reaction decreases with an increase in the concentration of sodium trimetaphosphate in the system, while the effi ciency of the cationization reaction does not change. It was found that the rate of fl occulation of kaolin suspensions increases with an increase in the dose of fl occulant for all types of cationic starches. It has been shown that, regardless of the dose, the maximum sedimentation rates of kaolin in model systems are observed when using cross-linked cationic potato starch. The results obtained can be used to develop a technology for producing biodegradable crosslinked cationic starches with the aim of their further use in polymer fl ooding to increase oil recovery, and also as effective fl occulants for cleaning aqueous solutions as an alternative to synthetic polyacrylamide derivatives.