OBTAINING AND STUDYING THE PROPERTIES OF HIGHLY SUBSTITUTED CATIONIC STARCHES OF DIFFERENT BOTANICAL ORIGINS

Regularities have been investigated and a method has been developed for onestage cationization and cross-linking of potato and corn starches using epichlorohydrin as a cross-linking agent. Samples of cross-linked cationic potato and corn starches with controlled viscosity properties, the aqueous dispersions of which exhibit pseudoplastic properties at various temperatures and degrees of cross-linking, have been synthesized. 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 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