Preparation method of borate-type brake fluid

Abstract

The invention relates to a preparation method of a borate-type brake fluid, belonging to the technical field of automobile brake fluids. The method comprises the following steps: carrying out esterification and amide reaction on 1,2-propanediol and thionyl chloride in a flaxseed oil environment, and carrying out ring opening and other reactions on the reaction product, dimethylamine and pyrazole under the action of sodium hydride to form ketoximes, thereby increasing amino and hydroxy groups; combining the ketoximes with platinum ions in a platinum nitrate solution in an alkaline environment to form steric hindrance groups of platinum coordination compounds; in the process of preparing borate from propanol, epoxypropane and boric acid, combining the steric hindrance groups of platinum coordination compounds with borate by using sodium acid pyrophosphate as a chelator to increase the steric hindrance of borate, thereby resisting the attack of water molecules and enhancing the water resistance; and mixing with a diluter triethylene glycol methyl ether and other aids, thereby obtaining the borate-type brake fluid. The preparation method solves the problems of high hydrolysis tendency and poor water resistance in the traditional borate-type brake fluid.

Description

technical field

[0001] The invention relates to a preparation method of borate-type brake fluid, which belongs to the technical field of automobile brake fluid. Background technique

[0002] Automobile brake fluid is the working medium for transmitting pressure in hydraulic transmission, which affects the braking control of automobiles. Since the beginning of the 1930s when automobiles began to use brake fluid, the development of brake fluid has experienced three types, namely castor oil alcohol Type, mineral oil type and synthetic type, alcohol type brake fluid and mineral oil type brake fluid have been eliminated because of their low boiling point and high freezing point, and synthetic brake fluid has just been produced. Alcohol ether synthetic brake fluid has a simple synthesis process and good lubricating performance, but its water resistance is poor, which makes the equilibrium reflux boiling point of the brake fluid itself decrease, and the viscosity at low temperature...