Phosphate-borate ester preparation, structural elucidation and application as hydraulic brake fluid base

Hydraulic brake fluid is an area for considerable research effort. These fluids must possess high chemical and thermal stability, low corrosivity and high degree of water tolerance. These fluids are formulated from base, diluent and additives. Different structures, based on tri- and bis-borate as well as phosphate esters of hydraulic brake fluids are reported in the literature. [1] The incompatibility, deterioration, easy oxidation and instability are disadvantages of some of the above mentioned compounds. Their use is handicapped by the fact that a wide range of suitable properties cannot be attained.[1,2] Accordingly, the idea for the preparation ol triphosphate-borate ester was originated. We presumed that they may exhibit excellent properties of high degree of compatibility with other hydraulic brake fluids, high stability and are useful under a wide variety of climatic and operational conditions. We also predict that they meet the standard specifications

Preparation and structure of hydralic brake fluid base compounds of boron-nitrogen type

Hydaulic brake fluid base compounds of boron-nitrogen type have been prepared in two steps. First step, a stoichiometric amount of a boron-containing compound is reacted with alkoxy glycol monoether to yield an intermediate borate compound. Secondly, this intermediate is reacted with a hydroxy compound including mono-, di- or triethanolamine to obtain the base borate compound. Their structures have been established by infrared, nuclear magnetic resonance, gas chromatography and mass spectrometry, as well as by determination of refractive index, elemental analysis and viscosity. A mathematical esterification modeling has been suggested. These compounds have been tested as hydraulic brake fluid bases according to Standard Specifications