Authors: T.G. Cherkasova, AkhremkovaYu.S.

Title of the article: Rheological studies of polymer aqueous solutions used as thickeners of hydraulic fluids

Year: 2018, Issue: 3, Pages: 79-85

Branch of knowledge: Chemical technology

Index UDK: 66.06

DOI: 10.26730/1999-4125-2018-3-79-85

Abstract: The literature on the classification, composition and properties of hydraulic fluids is presented. Hydraulic fluids type HFA are used in modern hydraulic systems in the coal industry. These are water-oil emulsions or aqueous solutions of chemical compounds with appropriate additives. The most common hydraulic fluids are based on polymers. The complex analysis of solutions in polyethylene glycols (PEG) of various molecular weights at different temperatures is carried out in the article. Tests have been conducted to determine the kinematic viscosity of the systems “PEG – distilled water” and “PEG – ‘hard’ water”. The calculations of the parameters characterizing the viscosity were made on the basis of the obtained data. The inherent viscosity, α andHaggins constants have been defined for the given systems. The behavior and structure of macromolecules in aqueous solutions of different rigidity are described. The process of formation of equilibrium solutions of polymers is considered. Also, influence of water temperature and hardness on the state of PEG molecules in the solution is shown. The assumptions about the structure of macromolecules of polymers in solution are made.The studies have shown that aqueous solutions of high-molecular polymers are more stable than aqueous solutions of low-molecular polymers. Stability of high-molecular compounds is due to strong bonds between polymer chain monomers and the formation of hydrogen bonds of polymer macromolecules with water molecules.

Key words: Hydraulic fluid coal mining aqueous solution polyethylene glycol viscosity macromolecule polymers molecular weight

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