kinetics

The method presents obtaining hydrosoluble graft copolymer of complicated structure based on сhitosan, acrylamide (AM), sodium 2-acrylamido-2-methylpropane sulfonic (АМPS-Na) in order to obtain fl ocсulant which is resistant to salt of transition metals and heat temperature, and in order to use it as a reagent for oil production processes.

The process of cold phosphating (25°C) of the carbon steel St3 in the zinc nitrate-phosphate system was studied using a set of physical, chemical and electrochemical methods. The electrochemical nature of steel phosphating in the given conditions was confirmed. Ways of improving the phosphating process to obtain corrosion-resistant phosphate coatings on steel were identified: modifying the phosphating solution with an inorganic silicon-containing additive and the subsequent processing of phosphate films in an aqueous solution containing silicon compounds.

Hydrodynamic, optical, colloid-flocculating, film-forming and structural morphological properties of diluted chitosan solutions (50–640 kDa) in acetate buffer (0.33 М СН3СООН + 0.2 М СН3СOONa), both initial ones and stored for ~1,850 days, were studied. It has been established that the decrease in the intrinsic viscosity of solutions over time is manifested for the reprecipitated and high-molecular-weight samples of chitosan to a greater degree.